Vendoring with Glide and delete function handler

gateway/vendor/github.com/prometheus/common/.travis.yml

@@ -0,0 +1,6 @@
+sudo: false
+
+language: go
+go:
+  - 1.7.5
+  - tip

gateway/vendor/github.com/prometheus/common/CONTRIBUTING.md

@@ -0,0 +1,18 @@
+# Contributing
+
+Prometheus uses GitHub to manage reviews of pull requests.
+
+* If you have a trivial fix or improvement, go ahead and create a pull request,
+  addressing (with `@...`) the maintainer of this repository (see
+  [MAINTAINERS.md](MAINTAINERS.md)) in the description of the pull request.
+
+* If you plan to do something more involved, first discuss your ideas
+  on our [mailing list](https://groups.google.com/forum/?fromgroups#!forum/prometheus-developers).
+  This will avoid unnecessary work and surely give you and us a good deal
+  of inspiration.
+
+* Relevant coding style guidelines are the [Go Code Review
+  Comments](https://code.google.com/p/go-wiki/wiki/CodeReviewComments)
+  and the _Formatting and style_ section of Peter Bourgon's [Go: Best
+  Practices for Production
+  Environments](http://peter.bourgon.org/go-in-production/#formatting-and-style).

gateway/vendor/github.com/prometheus/common/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      direction or management of such entity, whether by contract or
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
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+      file or class name and description of purpose be included on the
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

gateway/vendor/github.com/prometheus/common/MAINTAINERS.md

@@ -0,0 +1 @@
+* Fabian Reinartz <fabian.reinartz@coreos.com>

gateway/vendor/github.com/prometheus/common/NOTICE

@@ -0,0 +1,5 @@
+Common libraries shared by Prometheus Go components.
+Copyright 2015 The Prometheus Authors
+
+This product includes software developed at
+SoundCloud Ltd. (http://soundcloud.com/).

gateway/vendor/github.com/prometheus/common/README.md

@@ -0,0 +1,12 @@
+# Common
+[![Build Status](https://travis-ci.org/prometheus/common.svg)](https://travis-ci.org/prometheus/common)
+
+This repository contains Go libraries that are shared across Prometheus
+components and libraries.
+
+* **config**: Common configuration structures
+* **expfmt**: Decoding and encoding for the exposition format
+* **log**: A logging wrapper around [logrus](https://github.com/Sirupsen/logrus)
+* **model**: Shared data structures
+* **route**: A routing wrapper around [httprouter](https://github.com/julienschmidt/httprouter) using `context.Context`
+* **version**: Version informations and metric

gateway/vendor/github.com/prometheus/common/config/config.go

@@ -0,0 +1,30 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"fmt"
+	"strings"
+)
+
+func checkOverflow(m map[string]interface{}, ctx string) error {
+	if len(m) > 0 {
+		var keys []string
+		for k := range m {
+			keys = append(keys, k)
+		}
+		return fmt.Errorf("unknown fields in %s: %s", ctx, strings.Join(keys, ", "))
+	}
+	return nil
+}

gateway/vendor/github.com/prometheus/common/config/testdata/tls_config.cert_no_key.bad.yml

@@ -0,0 +1 @@
+cert_file: somefile

gateway/vendor/github.com/prometheus/common/config/testdata/tls_config.insecure.good.yml

@@ -0,0 +1 @@
+insecure_skip_verify: true

gateway/vendor/github.com/prometheus/common/config/testdata/tls_config.invalid_field.bad.yml

@@ -0,0 +1 @@
+something_invalid: true

gateway/vendor/github.com/prometheus/common/config/testdata/tls_config.key_no_cert.bad.yml

@@ -0,0 +1 @@
+key_file: somefile

gateway/vendor/github.com/prometheus/common/config/tls_config.go

@@ -0,0 +1,79 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+)
+
+// TLSConfig configures the options for TLS connections.
+type TLSConfig struct {
+	// The CA cert to use for the targets.
+	CAFile string `yaml:"ca_file,omitempty"`
+	// The client cert file for the targets.
+	CertFile string `yaml:"cert_file,omitempty"`
+	// The client key file for the targets.
+	KeyFile string `yaml:"key_file,omitempty"`
+	// Disable target certificate validation.
+	InsecureSkipVerify bool `yaml:"insecure_skip_verify"`
+
+	// Catches all undefined fields and must be empty after parsing.
+	XXX map[string]interface{} `yaml:",inline"`
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *TLSConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type plain TLSConfig
+	if err := unmarshal((*plain)(c)); err != nil {
+		return err
+	}
+	return checkOverflow(c.XXX, "TLS config")
+}
+
+// GenerateConfig produces a tls.Config based on TLS connection options.
+// It loads certificate files from disk if they are defined.
+func (c *TLSConfig) GenerateConfig() (*tls.Config, error) {
+	tlsConfig := &tls.Config{InsecureSkipVerify: c.InsecureSkipVerify}
+
+	// If a CA cert is provided then let's read it in so we can validate the
+	// scrape target's certificate properly.
+	if len(c.CAFile) > 0 {
+		caCertPool := x509.NewCertPool()
+		// Load CA cert.
+		caCert, err := ioutil.ReadFile(c.CAFile)
+		if err != nil {
+			return nil, fmt.Errorf("unable to use specified CA cert %s: %s", c.CAFile, err)
+		}
+		caCertPool.AppendCertsFromPEM(caCert)
+		tlsConfig.RootCAs = caCertPool
+	}
+
+	if len(c.CertFile) > 0 && len(c.KeyFile) == 0 {
+		return nil, fmt.Errorf("client cert file %q specified without client key file", c.CertFile)
+	} else if len(c.KeyFile) > 0 && len(c.CertFile) == 0 {
+		return nil, fmt.Errorf("client key file %q specified without client cert file", c.KeyFile)
+	} else if len(c.CertFile) > 0 && len(c.KeyFile) > 0 {
+		cert, err := tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
+		if err != nil {
+			return nil, fmt.Errorf("unable to use specified client cert (%s) & key (%s): %s", c.CertFile, c.KeyFile, err)
+		}
+		tlsConfig.Certificates = []tls.Certificate{cert}
+	}
+	tlsConfig.BuildNameToCertificate()
+
+	return tlsConfig, nil
+}

gateway/vendor/github.com/prometheus/common/config/tls_config_test.go

@@ -0,0 +1,92 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"crypto/tls"
+	"io/ioutil"
+	"reflect"
+	"strings"
+	"testing"
+
+	"gopkg.in/yaml.v2"
+)
+
+// LoadTLSConfig parses the given YAML file into a tls.Config.
+func LoadTLSConfig(filename string) (*tls.Config, error) {
+	content, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+	cfg := &TLSConfig{}
+	if err = yaml.Unmarshal(content, cfg); err != nil {
+		return nil, err
+	}
+	return cfg.GenerateConfig()
+}
+
+var expectedTLSConfigs = []struct {
+	filename string
+	config   *tls.Config
+}{
+	{
+		filename: "tls_config.empty.good.yml",
+		config:   &tls.Config{},
+	}, {
+		filename: "tls_config.insecure.good.yml",
+		config:   &tls.Config{InsecureSkipVerify: true},
+	},
+}
+
+func TestValidTLSConfig(t *testing.T) {
+	for _, cfg := range expectedTLSConfigs {
+		cfg.config.BuildNameToCertificate()
+		got, err := LoadTLSConfig("testdata/" + cfg.filename)
+		if err != nil {
+			t.Errorf("Error parsing %s: %s", cfg.filename, err)
+		}
+		if !reflect.DeepEqual(*got, *cfg.config) {
+			t.Fatalf("%s: unexpected config result: \n\n%s\n expected\n\n%s", cfg.filename, got, cfg.config)
+		}
+	}
+}
+
+var expectedTLSConfigErrors = []struct {
+	filename string
+	errMsg   string
+}{
+	{
+		filename: "tls_config.invalid_field.bad.yml",
+		errMsg:   "unknown fields in",
+	}, {
+		filename: "tls_config.cert_no_key.bad.yml",
+		errMsg:   "specified without client key file",
+	}, {
+		filename: "tls_config.key_no_cert.bad.yml",
+		errMsg:   "specified without client cert file",
+	},
+}
+
+func TestBadTLSConfigs(t *testing.T) {
+	for _, ee := range expectedTLSConfigErrors {
+		_, err := LoadTLSConfig("testdata/" + ee.filename)
+		if err == nil {
+			t.Errorf("Expected error parsing %s but got none", ee.filename)
+			continue
+		}
+		if !strings.Contains(err.Error(), ee.errMsg) {
+			t.Errorf("Expected error for %s to contain %q but got: %s", ee.filename, ee.errMsg, err)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/expfmt/bench_test.go

@@ -0,0 +1,167 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io"
+	"io/ioutil"
+	"testing"
+
+	"github.com/matttproud/golang_protobuf_extensions/pbutil"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+var parser TextParser
+
+// Benchmarks to show how much penalty text format parsing actually inflicts.
+//
+// Example results on Linux 3.13.0, Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz, go1.4.
+//
+// BenchmarkParseText          1000           1188535 ns/op          205085 B/op       6135 allocs/op
+// BenchmarkParseTextGzip      1000           1376567 ns/op          246224 B/op       6151 allocs/op
+// BenchmarkParseProto        10000            172790 ns/op           52258 B/op       1160 allocs/op
+// BenchmarkParseProtoGzip     5000            324021 ns/op           94931 B/op       1211 allocs/op
+// BenchmarkParseProtoMap     10000            187946 ns/op           58714 B/op       1203 allocs/op
+//
+// CONCLUSION: The overhead for the map is negligible. Text format needs ~5x more allocations.
+// Without compression, it needs ~7x longer, but with compression (the more relevant scenario),
+// the difference becomes less relevant, only ~4x.
+//
+// The test data contains 248 samples.
+
+// BenchmarkParseText benchmarks the parsing of a text-format scrape into metric
+// family DTOs.
+func BenchmarkParseText(b *testing.B) {
+	b.StopTimer()
+	data, err := ioutil.ReadFile("testdata/text")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		if _, err := parser.TextToMetricFamilies(bytes.NewReader(data)); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+// BenchmarkParseTextGzip benchmarks the parsing of a gzipped text-format scrape
+// into metric family DTOs.
+func BenchmarkParseTextGzip(b *testing.B) {
+	b.StopTimer()
+	data, err := ioutil.ReadFile("testdata/text.gz")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		in, err := gzip.NewReader(bytes.NewReader(data))
+		if err != nil {
+			b.Fatal(err)
+		}
+		if _, err := parser.TextToMetricFamilies(in); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+// BenchmarkParseProto benchmarks the parsing of a protobuf-format scrape into
+// metric family DTOs. Note that this does not build a map of metric families
+// (as the text version does), because it is not required for Prometheus
+// ingestion either. (However, it is required for the text-format parsing, as
+// the metric family might be sprinkled all over the text, while the
+// protobuf-format guarantees bundling at one place.)
+func BenchmarkParseProto(b *testing.B) {
+	b.StopTimer()
+	data, err := ioutil.ReadFile("testdata/protobuf")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		family := &dto.MetricFamily{}
+		in := bytes.NewReader(data)
+		for {
+			family.Reset()
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
+				if err == io.EOF {
+					break
+				}
+				b.Fatal(err)
+			}
+		}
+	}
+}
+
+// BenchmarkParseProtoGzip is like BenchmarkParseProto above, but parses gzipped
+// protobuf format.
+func BenchmarkParseProtoGzip(b *testing.B) {
+	b.StopTimer()
+	data, err := ioutil.ReadFile("testdata/protobuf.gz")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		family := &dto.MetricFamily{}
+		in, err := gzip.NewReader(bytes.NewReader(data))
+		if err != nil {
+			b.Fatal(err)
+		}
+		for {
+			family.Reset()
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
+				if err == io.EOF {
+					break
+				}
+				b.Fatal(err)
+			}
+		}
+	}
+}
+
+// BenchmarkParseProtoMap is like BenchmarkParseProto but DOES put the parsed
+// metric family DTOs into a map. This is not happening during Prometheus
+// ingestion. It is just here to measure the overhead of that map creation and
+// separate it from the overhead of the text format parsing.
+func BenchmarkParseProtoMap(b *testing.B) {
+	b.StopTimer()
+	data, err := ioutil.ReadFile("testdata/protobuf")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		families := map[string]*dto.MetricFamily{}
+		in := bytes.NewReader(data)
+		for {
+			family := &dto.MetricFamily{}
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
+				if err == io.EOF {
+					break
+				}
+				b.Fatal(err)
+			}
+			families[family.GetName()] = family
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/expfmt/decode.go

@@ -0,0 +1,429 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"mime"
+	"net/http"
+
+	dto "github.com/prometheus/client_model/go"
+
+	"github.com/matttproud/golang_protobuf_extensions/pbutil"
+	"github.com/prometheus/common/model"
+)
+
+// Decoder types decode an input stream into metric families.
+type Decoder interface {
+	Decode(*dto.MetricFamily) error
+}
+
+// DecodeOptions contains options used by the Decoder and in sample extraction.
+type DecodeOptions struct {
+	// Timestamp is added to each value from the stream that has no explicit timestamp set.
+	Timestamp model.Time
+}
+
+// ResponseFormat extracts the correct format from a HTTP response header.
+// If no matching format can be found FormatUnknown is returned.
+func ResponseFormat(h http.Header) Format {
+	ct := h.Get(hdrContentType)
+
+	mediatype, params, err := mime.ParseMediaType(ct)
+	if err != nil {
+		return FmtUnknown
+	}
+
+	const textType = "text/plain"
+
+	switch mediatype {
+	case ProtoType:
+		if p, ok := params["proto"]; ok && p != ProtoProtocol {
+			return FmtUnknown
+		}
+		if e, ok := params["encoding"]; ok && e != "delimited" {
+			return FmtUnknown
+		}
+		return FmtProtoDelim
+
+	case textType:
+		if v, ok := params["version"]; ok && v != TextVersion {
+			return FmtUnknown
+		}
+		return FmtText
+	}
+
+	return FmtUnknown
+}
+
+// NewDecoder returns a new decoder based on the given input format.
+// If the input format does not imply otherwise, a text format decoder is returned.
+func NewDecoder(r io.Reader, format Format) Decoder {
+	switch format {
+	case FmtProtoDelim:
+		return &protoDecoder{r: r}
+	}
+	return &textDecoder{r: r}
+}
+
+// protoDecoder implements the Decoder interface for protocol buffers.
+type protoDecoder struct {
+	r io.Reader
+}
+
+// Decode implements the Decoder interface.
+func (d *protoDecoder) Decode(v *dto.MetricFamily) error {
+	_, err := pbutil.ReadDelimited(d.r, v)
+	if err != nil {
+		return err
+	}
+	if !model.IsValidMetricName(model.LabelValue(v.GetName())) {
+		return fmt.Errorf("invalid metric name %q", v.GetName())
+	}
+	for _, m := range v.GetMetric() {
+		if m == nil {
+			continue
+		}
+		for _, l := range m.GetLabel() {
+			if l == nil {
+				continue
+			}
+			if !model.LabelValue(l.GetValue()).IsValid() {
+				return fmt.Errorf("invalid label value %q", l.GetValue())
+			}
+			if !model.LabelName(l.GetName()).IsValid() {
+				return fmt.Errorf("invalid label name %q", l.GetName())
+			}
+		}
+	}
+	return nil
+}
+
+// textDecoder implements the Decoder interface for the text protocol.
+type textDecoder struct {
+	r    io.Reader
+	p    TextParser
+	fams []*dto.MetricFamily
+}
+
+// Decode implements the Decoder interface.
+func (d *textDecoder) Decode(v *dto.MetricFamily) error {
+	// TODO(fabxc): Wrap this as a line reader to make streaming safer.
+	if len(d.fams) == 0 {
+		// No cached metric families, read everything and parse metrics.
+		fams, err := d.p.TextToMetricFamilies(d.r)
+		if err != nil {
+			return err
+		}
+		if len(fams) == 0 {
+			return io.EOF
+		}
+		d.fams = make([]*dto.MetricFamily, 0, len(fams))
+		for _, f := range fams {
+			d.fams = append(d.fams, f)
+		}
+	}
+
+	*v = *d.fams[0]
+	d.fams = d.fams[1:]
+
+	return nil
+}
+
+// SampleDecoder wraps a Decoder to extract samples from the metric families
+// decoded by the wrapped Decoder.
+type SampleDecoder struct {
+	Dec  Decoder
+	Opts *DecodeOptions
+
+	f dto.MetricFamily
+}
+
+// Decode calls the Decode method of the wrapped Decoder and then extracts the
+// samples from the decoded MetricFamily into the provided model.Vector.
+func (sd *SampleDecoder) Decode(s *model.Vector) error {
+	err := sd.Dec.Decode(&sd.f)
+	if err != nil {
+		return err
+	}
+	*s, err = extractSamples(&sd.f, sd.Opts)
+	return err
+}
+
+// ExtractSamples builds a slice of samples from the provided metric
+// families. If an error occurs during sample extraction, it continues to
+// extract from the remaining metric families. The returned error is the last
+// error that has occured.
+func ExtractSamples(o *DecodeOptions, fams ...*dto.MetricFamily) (model.Vector, error) {
+	var (
+		all     model.Vector
+		lastErr error
+	)
+	for _, f := range fams {
+		some, err := extractSamples(f, o)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+		all = append(all, some...)
+	}
+	return all, lastErr
+}
+
+func extractSamples(f *dto.MetricFamily, o *DecodeOptions) (model.Vector, error) {
+	switch f.GetType() {
+	case dto.MetricType_COUNTER:
+		return extractCounter(o, f), nil
+	case dto.MetricType_GAUGE:
+		return extractGauge(o, f), nil
+	case dto.MetricType_SUMMARY:
+		return extractSummary(o, f), nil
+	case dto.MetricType_UNTYPED:
+		return extractUntyped(o, f), nil
+	case dto.MetricType_HISTOGRAM:
+		return extractHistogram(o, f), nil
+	}
+	return nil, fmt.Errorf("expfmt.extractSamples: unknown metric family type %v", f.GetType())
+}
+
+func extractCounter(o *DecodeOptions, f *dto.MetricFamily) model.Vector {
+	samples := make(model.Vector, 0, len(f.Metric))
+
+	for _, m := range f.Metric {
+		if m.Counter == nil {
+			continue
+		}
+
+		lset := make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName())
+
+		smpl := &model.Sample{
+			Metric: model.Metric(lset),
+			Value:  model.SampleValue(m.Counter.GetValue()),
+		}
+
+		if m.TimestampMs != nil {
+			smpl.Timestamp = model.TimeFromUnixNano(*m.TimestampMs * 1000000)
+		} else {
+			smpl.Timestamp = o.Timestamp
+		}
+
+		samples = append(samples, smpl)
+	}
+
+	return samples
+}
+
+func extractGauge(o *DecodeOptions, f *dto.MetricFamily) model.Vector {
+	samples := make(model.Vector, 0, len(f.Metric))
+
+	for _, m := range f.Metric {
+		if m.Gauge == nil {
+			continue
+		}
+
+		lset := make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName())
+
+		smpl := &model.Sample{
+			Metric: model.Metric(lset),
+			Value:  model.SampleValue(m.Gauge.GetValue()),
+		}
+
+		if m.TimestampMs != nil {
+			smpl.Timestamp = model.TimeFromUnixNano(*m.TimestampMs * 1000000)
+		} else {
+			smpl.Timestamp = o.Timestamp
+		}
+
+		samples = append(samples, smpl)
+	}
+
+	return samples
+}
+
+func extractUntyped(o *DecodeOptions, f *dto.MetricFamily) model.Vector {
+	samples := make(model.Vector, 0, len(f.Metric))
+
+	for _, m := range f.Metric {
+		if m.Untyped == nil {
+			continue
+		}
+
+		lset := make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName())
+
+		smpl := &model.Sample{
+			Metric: model.Metric(lset),
+			Value:  model.SampleValue(m.Untyped.GetValue()),
+		}
+
+		if m.TimestampMs != nil {
+			smpl.Timestamp = model.TimeFromUnixNano(*m.TimestampMs * 1000000)
+		} else {
+			smpl.Timestamp = o.Timestamp
+		}
+
+		samples = append(samples, smpl)
+	}
+
+	return samples
+}
+
+func extractSummary(o *DecodeOptions, f *dto.MetricFamily) model.Vector {
+	samples := make(model.Vector, 0, len(f.Metric))
+
+	for _, m := range f.Metric {
+		if m.Summary == nil {
+			continue
+		}
+
+		timestamp := o.Timestamp
+		if m.TimestampMs != nil {
+			timestamp = model.TimeFromUnixNano(*m.TimestampMs * 1000000)
+		}
+
+		for _, q := range m.Summary.Quantile {
+			lset := make(model.LabelSet, len(m.Label)+2)
+			for _, p := range m.Label {
+				lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+			}
+			// BUG(matt): Update other names to "quantile".
+			lset[model.LabelName(model.QuantileLabel)] = model.LabelValue(fmt.Sprint(q.GetQuantile()))
+			lset[model.MetricNameLabel] = model.LabelValue(f.GetName())
+
+			samples = append(samples, &model.Sample{
+				Metric:    model.Metric(lset),
+				Value:     model.SampleValue(q.GetValue()),
+				Timestamp: timestamp,
+			})
+		}
+
+		lset := make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_sum")
+
+		samples = append(samples, &model.Sample{
+			Metric:    model.Metric(lset),
+			Value:     model.SampleValue(m.Summary.GetSampleSum()),
+			Timestamp: timestamp,
+		})
+
+		lset = make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_count")
+
+		samples = append(samples, &model.Sample{
+			Metric:    model.Metric(lset),
+			Value:     model.SampleValue(m.Summary.GetSampleCount()),
+			Timestamp: timestamp,
+		})
+	}
+
+	return samples
+}
+
+func extractHistogram(o *DecodeOptions, f *dto.MetricFamily) model.Vector {
+	samples := make(model.Vector, 0, len(f.Metric))
+
+	for _, m := range f.Metric {
+		if m.Histogram == nil {
+			continue
+		}
+
+		timestamp := o.Timestamp
+		if m.TimestampMs != nil {
+			timestamp = model.TimeFromUnixNano(*m.TimestampMs * 1000000)
+		}
+
+		infSeen := false
+
+		for _, q := range m.Histogram.Bucket {
+			lset := make(model.LabelSet, len(m.Label)+2)
+			for _, p := range m.Label {
+				lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+			}
+			lset[model.LabelName(model.BucketLabel)] = model.LabelValue(fmt.Sprint(q.GetUpperBound()))
+			lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_bucket")
+
+			if math.IsInf(q.GetUpperBound(), +1) {
+				infSeen = true
+			}
+
+			samples = append(samples, &model.Sample{
+				Metric:    model.Metric(lset),
+				Value:     model.SampleValue(q.GetCumulativeCount()),
+				Timestamp: timestamp,
+			})
+		}
+
+		lset := make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_sum")
+
+		samples = append(samples, &model.Sample{
+			Metric:    model.Metric(lset),
+			Value:     model.SampleValue(m.Histogram.GetSampleSum()),
+			Timestamp: timestamp,
+		})
+
+		lset = make(model.LabelSet, len(m.Label)+1)
+		for _, p := range m.Label {
+			lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+		}
+		lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_count")
+
+		count := &model.Sample{
+			Metric:    model.Metric(lset),
+			Value:     model.SampleValue(m.Histogram.GetSampleCount()),
+			Timestamp: timestamp,
+		}
+		samples = append(samples, count)
+
+		if !infSeen {
+			// Append an infinity bucket sample.
+			lset := make(model.LabelSet, len(m.Label)+2)
+			for _, p := range m.Label {
+				lset[model.LabelName(p.GetName())] = model.LabelValue(p.GetValue())
+			}
+			lset[model.LabelName(model.BucketLabel)] = model.LabelValue("+Inf")
+			lset[model.MetricNameLabel] = model.LabelValue(f.GetName() + "_bucket")
+
+			samples = append(samples, &model.Sample{
+				Metric:    model.Metric(lset),
+				Value:     count.Value,
+				Timestamp: timestamp,
+			})
+		}
+	}
+
+	return samples
+}

gateway/vendor/github.com/prometheus/common/expfmt/decode_test.go

@@ -0,0 +1,435 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"io"
+	"net/http"
+	"reflect"
+	"sort"
+	"strings"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+	dto "github.com/prometheus/client_model/go"
+
+	"github.com/prometheus/common/model"
+)
+
+func TestTextDecoder(t *testing.T) {
+	var (
+		ts = model.Now()
+		in = `
+# Only a quite simple scenario with two metric families.
+# More complicated tests of the parser itself can be found in the text package.
+# TYPE mf2 counter
+mf2 3
+mf1{label="value1"} -3.14 123456
+mf1{label="value2"} 42
+mf2 4
+`
+		out = model.Vector{
+			&model.Sample{
+				Metric: model.Metric{
+					model.MetricNameLabel: "mf1",
+					"label":               "value1",
+				},
+				Value:     -3.14,
+				Timestamp: 123456,
+			},
+			&model.Sample{
+				Metric: model.Metric{
+					model.MetricNameLabel: "mf1",
+					"label":               "value2",
+				},
+				Value:     42,
+				Timestamp: ts,
+			},
+			&model.Sample{
+				Metric: model.Metric{
+					model.MetricNameLabel: "mf2",
+				},
+				Value:     3,
+				Timestamp: ts,
+			},
+			&model.Sample{
+				Metric: model.Metric{
+					model.MetricNameLabel: "mf2",
+				},
+				Value:     4,
+				Timestamp: ts,
+			},
+		}
+	)
+
+	dec := &SampleDecoder{
+		Dec: &textDecoder{r: strings.NewReader(in)},
+		Opts: &DecodeOptions{
+			Timestamp: ts,
+		},
+	}
+	var all model.Vector
+	for {
+		var smpls model.Vector
+		err := dec.Decode(&smpls)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+		all = append(all, smpls...)
+	}
+	sort.Sort(all)
+	sort.Sort(out)
+	if !reflect.DeepEqual(all, out) {
+		t.Fatalf("output does not match")
+	}
+}
+
+func TestProtoDecoder(t *testing.T) {
+
+	var testTime = model.Now()
+
+	scenarios := []struct {
+		in       string
+		expected model.Vector
+		fail     bool
+	}{
+		{
+			in: "",
+		},
+		{
+			in:   "\x8f\x01\n\rrequest_count\x12\x12Number of requests\x18\x00\"0\n#\n\x0fsome_!abel_name\x12\x10some_label_value\x1a\t\t\x00\x00\x00\x00\x00\x00E\xc0\"6\n)\n\x12another_label_name\x12\x13another_label_value\x1a\t\t\x00\x00\x00\x00\x00\x00U@",
+			fail: true,
+		},
+		{
+			in: "\x8f\x01\n\rrequest_count\x12\x12Number of requests\x18\x00\"0\n#\n\x0fsome_label_name\x12\x10some_label_value\x1a\t\t\x00\x00\x00\x00\x00\x00E\xc0\"6\n)\n\x12another_label_name\x12\x13another_label_value\x1a\t\t\x00\x00\x00\x00\x00\x00U@",
+			expected: model.Vector{
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+						"some_label_name":     "some_label_value",
+					},
+					Value:     -42,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+						"another_label_name":  "another_label_value",
+					},
+					Value:     84,
+					Timestamp: testTime,
+				},
+			},
+		},
+		{
+			in: "\xb9\x01\n\rrequest_count\x12\x12Number of requests\x18\x02\"O\n#\n\x0fsome_label_name\x12\x10some_label_value\"(\x1a\x12\t\xaeG\xe1z\x14\xae\xef?\x11\x00\x00\x00\x00\x00\x00E\xc0\x1a\x12\t+\x87\x16\xd9\xce\xf7\xef?\x11\x00\x00\x00\x00\x00\x00U\xc0\"A\n)\n\x12another_label_name\x12\x13another_label_value\"\x14\x1a\x12\t\x00\x00\x00\x00\x00\x00\xe0?\x11\x00\x00\x00\x00\x00\x00$@",
+			expected: model.Vector{
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count_count",
+						"some_label_name":     "some_label_value",
+					},
+					Value:     0,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count_sum",
+						"some_label_name":     "some_label_value",
+					},
+					Value:     0,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+						"some_label_name":     "some_label_value",
+						"quantile":            "0.99",
+					},
+					Value:     -42,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+						"some_label_name":     "some_label_value",
+						"quantile":            "0.999",
+					},
+					Value:     -84,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count_count",
+						"another_label_name":  "another_label_value",
+					},
+					Value:     0,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count_sum",
+						"another_label_name":  "another_label_value",
+					},
+					Value:     0,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+						"another_label_name":  "another_label_value",
+						"quantile":            "0.5",
+					},
+					Value:     10,
+					Timestamp: testTime,
+				},
+			},
+		},
+		{
+			in: "\x8d\x01\n\x1drequest_duration_microseconds\x12\x15The response latency.\x18\x04\"S:Q\b\x85\x15\x11\xcd\xcc\xccL\x8f\xcb:A\x1a\v\b{\x11\x00\x00\x00\x00\x00\x00Y@\x1a\f\b\x9c\x03\x11\x00\x00\x00\x00\x00\x00^@\x1a\f\b\xd0\x04\x11\x00\x00\x00\x00\x00\x00b@\x1a\f\b\xf4\v\x11\x9a\x99\x99\x99\x99\x99e@\x1a\f\b\x85\x15\x11\x00\x00\x00\x00\x00\x00\xf0\u007f",
+			expected: model.Vector{
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_bucket",
+						"le": "100",
+					},
+					Value:     123,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_bucket",
+						"le": "120",
+					},
+					Value:     412,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_bucket",
+						"le": "144",
+					},
+					Value:     592,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_bucket",
+						"le": "172.8",
+					},
+					Value:     1524,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_bucket",
+						"le": "+Inf",
+					},
+					Value:     2693,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_sum",
+					},
+					Value:     1756047.3,
+					Timestamp: testTime,
+				},
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_duration_microseconds_count",
+					},
+					Value:     2693,
+					Timestamp: testTime,
+				},
+			},
+		},
+		{
+			// The metric type is unset in this protobuf, which needs to be handled
+			// correctly by the decoder.
+			in: "\x1c\n\rrequest_count\"\v\x1a\t\t\x00\x00\x00\x00\x00\x00\xf0?",
+			expected: model.Vector{
+				&model.Sample{
+					Metric: model.Metric{
+						model.MetricNameLabel: "request_count",
+					},
+					Value:     1,
+					Timestamp: testTime,
+				},
+			},
+		},
+	}
+
+	for i, scenario := range scenarios {
+		dec := &SampleDecoder{
+			Dec: &protoDecoder{r: strings.NewReader(scenario.in)},
+			Opts: &DecodeOptions{
+				Timestamp: testTime,
+			},
+		}
+
+		var all model.Vector
+		for {
+			var smpls model.Vector
+			err := dec.Decode(&smpls)
+			if err == io.EOF {
+				break
+			}
+			if scenario.fail {
+				if err == nil {
+					t.Fatal("Expected error but got none")
+				}
+				break
+			}
+			if err != nil {
+				t.Fatal(err)
+			}
+			all = append(all, smpls...)
+		}
+		sort.Sort(all)
+		sort.Sort(scenario.expected)
+		if !reflect.DeepEqual(all, scenario.expected) {
+			t.Fatalf("%d. output does not match, want: %#v, got %#v", i, scenario.expected, all)
+		}
+	}
+}
+
+func testDiscriminatorHTTPHeader(t testing.TB) {
+	var scenarios = []struct {
+		input  map[string]string
+		output Format
+		err    error
+	}{
+		{
+			input:  map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="delimited"`},
+			output: FmtProtoDelim,
+		},
+		{
+			input:  map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="illegal"; encoding="delimited"`},
+			output: FmtUnknown,
+		},
+		{
+			input:  map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="illegal"`},
+			output: FmtUnknown,
+		},
+		{
+			input:  map[string]string{"Content-Type": `text/plain; version=0.0.4`},
+			output: FmtText,
+		},
+		{
+			input:  map[string]string{"Content-Type": `text/plain`},
+			output: FmtText,
+		},
+		{
+			input:  map[string]string{"Content-Type": `text/plain; version=0.0.3`},
+			output: FmtUnknown,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		var header http.Header
+
+		if len(scenario.input) > 0 {
+			header = http.Header{}
+		}
+
+		for key, value := range scenario.input {
+			header.Add(key, value)
+		}
+
+		actual := ResponseFormat(header)
+
+		if scenario.output != actual {
+			t.Errorf("%d. expected %s, got %s", i, scenario.output, actual)
+		}
+	}
+}
+
+func TestDiscriminatorHTTPHeader(t *testing.T) {
+	testDiscriminatorHTTPHeader(t)
+}
+
+func BenchmarkDiscriminatorHTTPHeader(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testDiscriminatorHTTPHeader(b)
+	}
+}
+
+func TestExtractSamples(t *testing.T) {
+	var (
+		goodMetricFamily1 = &dto.MetricFamily{
+			Name: proto.String("foo"),
+			Help: proto.String("Help for foo."),
+			Type: dto.MetricType_COUNTER.Enum(),
+			Metric: []*dto.Metric{
+				&dto.Metric{
+					Counter: &dto.Counter{
+						Value: proto.Float64(4711),
+					},
+				},
+			},
+		}
+		goodMetricFamily2 = &dto.MetricFamily{
+			Name: proto.String("bar"),
+			Help: proto.String("Help for bar."),
+			Type: dto.MetricType_GAUGE.Enum(),
+			Metric: []*dto.Metric{
+				&dto.Metric{
+					Gauge: &dto.Gauge{
+						Value: proto.Float64(3.14),
+					},
+				},
+			},
+		}
+		badMetricFamily = &dto.MetricFamily{
+			Name: proto.String("bad"),
+			Help: proto.String("Help for bad."),
+			Type: dto.MetricType(42).Enum(),
+			Metric: []*dto.Metric{
+				&dto.Metric{
+					Gauge: &dto.Gauge{
+						Value: proto.Float64(2.7),
+					},
+				},
+			},
+		}
+
+		opts = &DecodeOptions{
+			Timestamp: 42,
+		}
+	)
+
+	got, err := ExtractSamples(opts, goodMetricFamily1, goodMetricFamily2)
+	if err != nil {
+		t.Error("Unexpected error from ExtractSamples:", err)
+	}
+	want := model.Vector{
+		&model.Sample{Metric: model.Metric{model.MetricNameLabel: "foo"}, Value: 4711, Timestamp: 42},
+		&model.Sample{Metric: model.Metric{model.MetricNameLabel: "bar"}, Value: 3.14, Timestamp: 42},
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("unexpected samples extracted, got: %v, want: %v", got, want)
+	}
+
+	got, err = ExtractSamples(opts, goodMetricFamily1, badMetricFamily, goodMetricFamily2)
+	if err == nil {
+		t.Error("Expected error from ExtractSamples")
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("unexpected samples extracted, got: %v, want: %v", got, want)
+	}
+}

gateway/vendor/github.com/prometheus/common/expfmt/encode.go

@@ -0,0 +1,88 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/matttproud/golang_protobuf_extensions/pbutil"
+	"github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+// Encoder types encode metric families into an underlying wire protocol.
+type Encoder interface {
+	Encode(*dto.MetricFamily) error
+}
+
+type encoder func(*dto.MetricFamily) error
+
+func (e encoder) Encode(v *dto.MetricFamily) error {
+	return e(v)
+}
+
+// Negotiate returns the Content-Type based on the given Accept header.
+// If no appropriate accepted type is found, FmtText is returned.
+func Negotiate(h http.Header) Format {
+	for _, ac := range goautoneg.ParseAccept(h.Get(hdrAccept)) {
+		// Check for protocol buffer
+		if ac.Type+"/"+ac.SubType == ProtoType && ac.Params["proto"] == ProtoProtocol {
+			switch ac.Params["encoding"] {
+			case "delimited":
+				return FmtProtoDelim
+			case "text":
+				return FmtProtoText
+			case "compact-text":
+				return FmtProtoCompact
+			}
+		}
+		// Check for text format.
+		ver := ac.Params["version"]
+		if ac.Type == "text" && ac.SubType == "plain" && (ver == TextVersion || ver == "") {
+			return FmtText
+		}
+	}
+	return FmtText
+}
+
+// NewEncoder returns a new encoder based on content type negotiation.
+func NewEncoder(w io.Writer, format Format) Encoder {
+	switch format {
+	case FmtProtoDelim:
+		return encoder(func(v *dto.MetricFamily) error {
+			_, err := pbutil.WriteDelimited(w, v)
+			return err
+		})
+	case FmtProtoCompact:
+		return encoder(func(v *dto.MetricFamily) error {
+			_, err := fmt.Fprintln(w, v.String())
+			return err
+		})
+	case FmtProtoText:
+		return encoder(func(v *dto.MetricFamily) error {
+			_, err := fmt.Fprintln(w, proto.MarshalTextString(v))
+			return err
+		})
+	case FmtText:
+		return encoder(func(v *dto.MetricFamily) error {
+			_, err := MetricFamilyToText(w, v)
+			return err
+		})
+	}
+	panic("expfmt.NewEncoder: unknown format")
+}

gateway/vendor/github.com/prometheus/common/expfmt/expfmt.go

@@ -0,0 +1,38 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package expfmt contains tools for reading and writing Prometheus metrics.
+package expfmt
+
+// Format specifies the HTTP content type of the different wire protocols.
+type Format string
+
+// Constants to assemble the Content-Type values for the different wire protocols.
+const (
+	TextVersion   = "0.0.4"
+	ProtoType     = `application/vnd.google.protobuf`
+	ProtoProtocol = `io.prometheus.client.MetricFamily`
+	ProtoFmt      = ProtoType + "; proto=" + ProtoProtocol + ";"
+
+	// The Content-Type values for the different wire protocols.
+	FmtUnknown      Format = `<unknown>`
+	FmtText         Format = `text/plain; version=` + TextVersion
+	FmtProtoDelim   Format = ProtoFmt + ` encoding=delimited`
+	FmtProtoText    Format = ProtoFmt + ` encoding=text`
+	FmtProtoCompact Format = ProtoFmt + ` encoding=compact-text`
+)
+
+const (
+	hdrContentType = "Content-Type"
+	hdrAccept      = "Accept"
+)

gateway/vendor/github.com/prometheus/common/expfmt/fuzz.go

@@ -0,0 +1,36 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Build only when actually fuzzing
+// +build gofuzz
+
+package expfmt
+
+import "bytes"
+
+// Fuzz text metric parser with with github.com/dvyukov/go-fuzz:
+//
+//     go-fuzz-build github.com/prometheus/common/expfmt
+//     go-fuzz -bin expfmt-fuzz.zip -workdir fuzz
+//
+// Further input samples should go in the folder fuzz/corpus.
+func Fuzz(in []byte) int {
+	parser := TextParser{}
+	_, err := parser.TextToMetricFamilies(bytes.NewReader(in))
+
+	if err != nil {
+		return 0
+	}
+
+	return 1
+}

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_0

@@ -0,0 +1,2 @@
+
+

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_1

@@ -0,0 +1,6 @@
+
+minimal_metric 1.234
+another_metric -3e3 103948
+# Even that:
+no_labels{} 3
+# HELP line for non-existing metric will be ignored.

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_2

@@ -0,0 +1,12 @@
+
+# A normal comment.
+#
+# TYPE name counter
+name{labelname="val1",basename="basevalue"} NaN
+name {labelname="val2",basename="base\"v\\al\nue"} 0.23 1234567890
+# HELP name two-line\n doc  str\\ing
+
+ # HELP  name2  	doc str"ing 2
+  #    TYPE    name2 gauge
+name2{labelname="val2"	,basename   =   "basevalue2"		} +Inf 54321
+name2{ labelname = "val1" , }-Inf

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_3

@@ -0,0 +1,22 @@
+
+# TYPE my_summary summary
+my_summary{n1="val1",quantile="0.5"} 110
+decoy -1 -2
+my_summary{n1="val1",quantile="0.9"} 140 1
+my_summary_count{n1="val1"} 42
+# Latest timestamp wins in case of a summary.
+my_summary_sum{n1="val1"} 4711 2
+fake_sum{n1="val1"} 2001
+# TYPE another_summary summary
+another_summary_count{n2="val2",n1="val1"} 20
+my_summary_count{n2="val2",n1="val1"} 5 5
+another_summary{n1="val1",n2="val2",quantile=".3"} -1.2
+my_summary_sum{n1="val2"} 08 15
+my_summary{n1="val3", quantile="0.2"} 4711
+  my_summary{n1="val1",n2="val2",quantile="-12.34",} NaN
+# some
+# funny comments
+# HELP 
+# HELP
+# HELP my_summary
+# HELP my_summary 

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_4

@@ -0,0 +1,10 @@
+
+# HELP request_duration_microseconds The response latency.
+# TYPE request_duration_microseconds histogram
+request_duration_microseconds_bucket{le="100"} 123
+request_duration_microseconds_bucket{le="120"} 412
+request_duration_microseconds_bucket{le="144"} 592
+request_duration_microseconds_bucket{le="172.8"} 1524
+request_duration_microseconds_bucket{le="+Inf"} 2693
+request_duration_microseconds_sum 1.7560473e+06
+request_duration_microseconds_count 2693

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_0

@@ -0,0 +1 @@
+bla 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_1

@@ -0,0 +1 @@
+metric{label="\t"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_10

@@ -0,0 +1 @@
+metric{label="bla"} 3.14 2 3

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_11

@@ -0,0 +1 @@
+metric{label="bla"} blubb

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_12

@@ -0,0 +1,3 @@
+
+# HELP metric one
+# HELP metric two

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_13

@@ -0,0 +1,3 @@
+
+# TYPE metric counter
+# TYPE metric untyped

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_14

@@ -0,0 +1,3 @@
+
+metric 4.12
+# TYPE metric counter

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_15

@@ -0,0 +1,2 @@
+
+# TYPE metric bla

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_16

@@ -0,0 +1,2 @@
+
+# TYPE met-ric

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_17

@@ -0,0 +1 @@
+@invalidmetric{label="bla"} 3.14 2

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_18

@@ -0,0 +1 @@
+{label="bla"} 3.14 2

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_19

@@ -0,0 +1,3 @@
+
+# TYPE metric histogram
+metric_bucket{le="bla"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_2

@@ -0,0 +1,3 @@
+
+metric{label="new
+line"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_3

@@ -0,0 +1 @@
+metric{@="bla"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_4

@@ -0,0 +1 @@
+metric{__name__="bla"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_5

@@ -0,0 +1 @@
+metric{label+="bla"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_6

@@ -0,0 +1 @@
+metric{label=bla} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_7

@@ -0,0 +1,3 @@
+
+# TYPE metric summary
+metric{quantile="bla"} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_8

@@ -0,0 +1 @@
+metric{label="bla"+} 3.14

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/from_test_parse_error_9

@@ -0,0 +1 @@
+metric{label="bla"} 3.14 2.72

gateway/vendor/github.com/prometheus/common/expfmt/fuzz/corpus/minimal

@@ -0,0 +1 @@
+m{} 0

gateway/vendor/github.com/prometheus/common/expfmt/testdata/json2

@@ -0,0 +1,46 @@
+[
+  {
+    "baseLabels": {
+      "__name__": "rpc_calls_total",
+      "job": "batch_job"
+    },
+    "docstring": "RPC calls.",
+    "metric": {
+      "type": "counter",
+      "value": [
+        {
+          "labels": {
+            "service": "zed"
+          },
+          "value": 25
+        },
+        {
+          "labels": {
+            "service": "bar"
+          },
+          "value": 24
+        }
+      ]
+    }
+  },
+  {
+    "baseLabels": {
+      "__name__": "rpc_latency_microseconds"
+    },
+    "docstring": "RPC latency.",
+    "metric": {
+      "type": "histogram",
+      "value": [
+        {
+          "labels": {
+            "service": "foo"
+          },
+          "value": {
+            "0.010000": 15,
+            "0.990000": 17
+          }
+        }
+      ]
+    }
+  }
+]

gateway/vendor/github.com/prometheus/common/expfmt/testdata/json2_bad

@@ -0,0 +1,46 @@
+[
+  {
+    "baseLabels": {
+      "__name__": "rpc_calls_total",
+      "job": "batch_job"
+    },
+    "docstring": "RPC calls.",
+    "metric": {
+      "type": "counter",
+      "value": [
+        {
+          "labels": {
+            "servic|e": "zed"
+          },
+          "value": 25
+        },
+        {
+          "labels": {
+            "service": "bar"
+          },
+          "value": 24
+        }
+      ]
+    }
+  },
+  {
+    "baseLabels": {
+      "__name__": "rpc_latency_microseconds"
+    },
+    "docstring": "RPC latency.",
+    "metric": {
+      "type": "histogram",
+      "value": [
+        {
+          "labels": {
+            "service": "foo"
+          },
+          "value": {
+            "0.010000": 15,
+            "0.990000": 17
+          }
+        }
+      ]
+    }
+  }
+]

gateway/vendor/github.com/prometheus/common/expfmt/testdata/text

@@ -0,0 +1,322 @@
+# HELP http_request_duration_microseconds The HTTP request latencies in microseconds.
+# TYPE http_request_duration_microseconds summary
+http_request_duration_microseconds{handler="/",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/"} 0
+http_request_duration_microseconds_count{handler="/"} 0
+http_request_duration_microseconds{handler="/alerts",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/alerts",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/alerts",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/alerts"} 0
+http_request_duration_microseconds_count{handler="/alerts"} 0
+http_request_duration_microseconds{handler="/api/metrics",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/api/metrics",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/api/metrics",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/api/metrics"} 0
+http_request_duration_microseconds_count{handler="/api/metrics"} 0
+http_request_duration_microseconds{handler="/api/query",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/api/query",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/api/query",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/api/query"} 0
+http_request_duration_microseconds_count{handler="/api/query"} 0
+http_request_duration_microseconds{handler="/api/query_range",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/api/query_range",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/api/query_range",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/api/query_range"} 0
+http_request_duration_microseconds_count{handler="/api/query_range"} 0
+http_request_duration_microseconds{handler="/api/targets",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/api/targets",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/api/targets",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/api/targets"} 0
+http_request_duration_microseconds_count{handler="/api/targets"} 0
+http_request_duration_microseconds{handler="/consoles/",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/consoles/",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/consoles/",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/consoles/"} 0
+http_request_duration_microseconds_count{handler="/consoles/"} 0
+http_request_duration_microseconds{handler="/graph",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/graph",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/graph",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/graph"} 0
+http_request_duration_microseconds_count{handler="/graph"} 0
+http_request_duration_microseconds{handler="/heap",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/heap",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/heap",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/heap"} 0
+http_request_duration_microseconds_count{handler="/heap"} 0
+http_request_duration_microseconds{handler="/static/",quantile="0.5"} 0
+http_request_duration_microseconds{handler="/static/",quantile="0.9"} 0
+http_request_duration_microseconds{handler="/static/",quantile="0.99"} 0
+http_request_duration_microseconds_sum{handler="/static/"} 0
+http_request_duration_microseconds_count{handler="/static/"} 0
+http_request_duration_microseconds{handler="prometheus",quantile="0.5"} 1307.275
+http_request_duration_microseconds{handler="prometheus",quantile="0.9"} 1858.632
+http_request_duration_microseconds{handler="prometheus",quantile="0.99"} 3087.384
+http_request_duration_microseconds_sum{handler="prometheus"} 179886.5000000001
+http_request_duration_microseconds_count{handler="prometheus"} 119
+# HELP http_request_size_bytes The HTTP request sizes in bytes.
+# TYPE http_request_size_bytes summary
+http_request_size_bytes{handler="/",quantile="0.5"} 0
+http_request_size_bytes{handler="/",quantile="0.9"} 0
+http_request_size_bytes{handler="/",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/"} 0
+http_request_size_bytes_count{handler="/"} 0
+http_request_size_bytes{handler="/alerts",quantile="0.5"} 0
+http_request_size_bytes{handler="/alerts",quantile="0.9"} 0
+http_request_size_bytes{handler="/alerts",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/alerts"} 0
+http_request_size_bytes_count{handler="/alerts"} 0
+http_request_size_bytes{handler="/api/metrics",quantile="0.5"} 0
+http_request_size_bytes{handler="/api/metrics",quantile="0.9"} 0
+http_request_size_bytes{handler="/api/metrics",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/api/metrics"} 0
+http_request_size_bytes_count{handler="/api/metrics"} 0
+http_request_size_bytes{handler="/api/query",quantile="0.5"} 0
+http_request_size_bytes{handler="/api/query",quantile="0.9"} 0
+http_request_size_bytes{handler="/api/query",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/api/query"} 0
+http_request_size_bytes_count{handler="/api/query"} 0
+http_request_size_bytes{handler="/api/query_range",quantile="0.5"} 0
+http_request_size_bytes{handler="/api/query_range",quantile="0.9"} 0
+http_request_size_bytes{handler="/api/query_range",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/api/query_range"} 0
+http_request_size_bytes_count{handler="/api/query_range"} 0
+http_request_size_bytes{handler="/api/targets",quantile="0.5"} 0
+http_request_size_bytes{handler="/api/targets",quantile="0.9"} 0
+http_request_size_bytes{handler="/api/targets",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/api/targets"} 0
+http_request_size_bytes_count{handler="/api/targets"} 0
+http_request_size_bytes{handler="/consoles/",quantile="0.5"} 0
+http_request_size_bytes{handler="/consoles/",quantile="0.9"} 0
+http_request_size_bytes{handler="/consoles/",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/consoles/"} 0
+http_request_size_bytes_count{handler="/consoles/"} 0
+http_request_size_bytes{handler="/graph",quantile="0.5"} 0
+http_request_size_bytes{handler="/graph",quantile="0.9"} 0
+http_request_size_bytes{handler="/graph",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/graph"} 0
+http_request_size_bytes_count{handler="/graph"} 0
+http_request_size_bytes{handler="/heap",quantile="0.5"} 0
+http_request_size_bytes{handler="/heap",quantile="0.9"} 0
+http_request_size_bytes{handler="/heap",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/heap"} 0
+http_request_size_bytes_count{handler="/heap"} 0
+http_request_size_bytes{handler="/static/",quantile="0.5"} 0
+http_request_size_bytes{handler="/static/",quantile="0.9"} 0
+http_request_size_bytes{handler="/static/",quantile="0.99"} 0
+http_request_size_bytes_sum{handler="/static/"} 0
+http_request_size_bytes_count{handler="/static/"} 0
+http_request_size_bytes{handler="prometheus",quantile="0.5"} 291
+http_request_size_bytes{handler="prometheus",quantile="0.9"} 291
+http_request_size_bytes{handler="prometheus",quantile="0.99"} 291
+http_request_size_bytes_sum{handler="prometheus"} 34488
+http_request_size_bytes_count{handler="prometheus"} 119
+# HELP http_requests_total Total number of HTTP requests made.
+# TYPE http_requests_total counter
+http_requests_total{code="200",handler="prometheus",method="get"} 119
+# HELP http_response_size_bytes The HTTP response sizes in bytes.
+# TYPE http_response_size_bytes summary
+http_response_size_bytes{handler="/",quantile="0.5"} 0
+http_response_size_bytes{handler="/",quantile="0.9"} 0
+http_response_size_bytes{handler="/",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/"} 0
+http_response_size_bytes_count{handler="/"} 0
+http_response_size_bytes{handler="/alerts",quantile="0.5"} 0
+http_response_size_bytes{handler="/alerts",quantile="0.9"} 0
+http_response_size_bytes{handler="/alerts",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/alerts"} 0
+http_response_size_bytes_count{handler="/alerts"} 0
+http_response_size_bytes{handler="/api/metrics",quantile="0.5"} 0
+http_response_size_bytes{handler="/api/metrics",quantile="0.9"} 0
+http_response_size_bytes{handler="/api/metrics",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/api/metrics"} 0
+http_response_size_bytes_count{handler="/api/metrics"} 0
+http_response_size_bytes{handler="/api/query",quantile="0.5"} 0
+http_response_size_bytes{handler="/api/query",quantile="0.9"} 0
+http_response_size_bytes{handler="/api/query",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/api/query"} 0
+http_response_size_bytes_count{handler="/api/query"} 0
+http_response_size_bytes{handler="/api/query_range",quantile="0.5"} 0
+http_response_size_bytes{handler="/api/query_range",quantile="0.9"} 0
+http_response_size_bytes{handler="/api/query_range",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/api/query_range"} 0
+http_response_size_bytes_count{handler="/api/query_range"} 0
+http_response_size_bytes{handler="/api/targets",quantile="0.5"} 0
+http_response_size_bytes{handler="/api/targets",quantile="0.9"} 0
+http_response_size_bytes{handler="/api/targets",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/api/targets"} 0
+http_response_size_bytes_count{handler="/api/targets"} 0
+http_response_size_bytes{handler="/consoles/",quantile="0.5"} 0
+http_response_size_bytes{handler="/consoles/",quantile="0.9"} 0
+http_response_size_bytes{handler="/consoles/",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/consoles/"} 0
+http_response_size_bytes_count{handler="/consoles/"} 0
+http_response_size_bytes{handler="/graph",quantile="0.5"} 0
+http_response_size_bytes{handler="/graph",quantile="0.9"} 0
+http_response_size_bytes{handler="/graph",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/graph"} 0
+http_response_size_bytes_count{handler="/graph"} 0
+http_response_size_bytes{handler="/heap",quantile="0.5"} 0
+http_response_size_bytes{handler="/heap",quantile="0.9"} 0
+http_response_size_bytes{handler="/heap",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/heap"} 0
+http_response_size_bytes_count{handler="/heap"} 0
+http_response_size_bytes{handler="/static/",quantile="0.5"} 0
+http_response_size_bytes{handler="/static/",quantile="0.9"} 0
+http_response_size_bytes{handler="/static/",quantile="0.99"} 0
+http_response_size_bytes_sum{handler="/static/"} 0
+http_response_size_bytes_count{handler="/static/"} 0
+http_response_size_bytes{handler="prometheus",quantile="0.5"} 2049
+http_response_size_bytes{handler="prometheus",quantile="0.9"} 2058
+http_response_size_bytes{handler="prometheus",quantile="0.99"} 2064
+http_response_size_bytes_sum{handler="prometheus"} 247001
+http_response_size_bytes_count{handler="prometheus"} 119
+# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
+# TYPE process_cpu_seconds_total counter
+process_cpu_seconds_total 0.55
+# HELP go_goroutines Number of goroutines that currently exist.
+# TYPE go_goroutines gauge
+go_goroutines 70
+# HELP process_max_fds Maximum number of open file descriptors.
+# TYPE process_max_fds gauge
+process_max_fds 8192
+# HELP process_open_fds Number of open file descriptors.
+# TYPE process_open_fds gauge
+process_open_fds 29
+# HELP process_resident_memory_bytes Resident memory size in bytes.
+# TYPE process_resident_memory_bytes gauge
+process_resident_memory_bytes 5.3870592e+07
+# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
+# TYPE process_start_time_seconds gauge
+process_start_time_seconds 1.42236894836e+09
+# HELP process_virtual_memory_bytes Virtual memory size in bytes.
+# TYPE process_virtual_memory_bytes gauge
+process_virtual_memory_bytes 5.41478912e+08
+# HELP prometheus_dns_sd_lookup_failures_total The number of DNS-SD lookup failures.
+# TYPE prometheus_dns_sd_lookup_failures_total counter
+prometheus_dns_sd_lookup_failures_total 0
+# HELP prometheus_dns_sd_lookups_total The number of DNS-SD lookups.
+# TYPE prometheus_dns_sd_lookups_total counter
+prometheus_dns_sd_lookups_total 7
+# HELP prometheus_evaluator_duration_milliseconds The duration for all evaluations to execute.
+# TYPE prometheus_evaluator_duration_milliseconds summary
+prometheus_evaluator_duration_milliseconds{quantile="0.01"} 0
+prometheus_evaluator_duration_milliseconds{quantile="0.05"} 0
+prometheus_evaluator_duration_milliseconds{quantile="0.5"} 0
+prometheus_evaluator_duration_milliseconds{quantile="0.9"} 1
+prometheus_evaluator_duration_milliseconds{quantile="0.99"} 1
+prometheus_evaluator_duration_milliseconds_sum 12
+prometheus_evaluator_duration_milliseconds_count 23
+# HELP prometheus_local_storage_checkpoint_duration_milliseconds The duration (in milliseconds) it took to checkpoint in-memory metrics and head chunks.
+# TYPE prometheus_local_storage_checkpoint_duration_milliseconds gauge
+prometheus_local_storage_checkpoint_duration_milliseconds 0
+# HELP prometheus_local_storage_chunk_ops_total The total number of chunk operations by their type.
+# TYPE prometheus_local_storage_chunk_ops_total counter
+prometheus_local_storage_chunk_ops_total{type="create"} 598
+prometheus_local_storage_chunk_ops_total{type="persist"} 174
+prometheus_local_storage_chunk_ops_total{type="pin"} 920
+prometheus_local_storage_chunk_ops_total{type="transcode"} 415
+prometheus_local_storage_chunk_ops_total{type="unpin"} 920
+# HELP prometheus_local_storage_indexing_batch_latency_milliseconds Quantiles for batch indexing latencies in milliseconds.
+# TYPE prometheus_local_storage_indexing_batch_latency_milliseconds summary
+prometheus_local_storage_indexing_batch_latency_milliseconds{quantile="0.5"} 0
+prometheus_local_storage_indexing_batch_latency_milliseconds{quantile="0.9"} 0
+prometheus_local_storage_indexing_batch_latency_milliseconds{quantile="0.99"} 0
+prometheus_local_storage_indexing_batch_latency_milliseconds_sum 0
+prometheus_local_storage_indexing_batch_latency_milliseconds_count 1
+# HELP prometheus_local_storage_indexing_batch_sizes Quantiles for indexing batch sizes (number of metrics per batch).
+# TYPE prometheus_local_storage_indexing_batch_sizes summary
+prometheus_local_storage_indexing_batch_sizes{quantile="0.5"} 2
+prometheus_local_storage_indexing_batch_sizes{quantile="0.9"} 2
+prometheus_local_storage_indexing_batch_sizes{quantile="0.99"} 2
+prometheus_local_storage_indexing_batch_sizes_sum 2
+prometheus_local_storage_indexing_batch_sizes_count 1
+# HELP prometheus_local_storage_indexing_queue_capacity The capacity of the indexing queue.
+# TYPE prometheus_local_storage_indexing_queue_capacity gauge
+prometheus_local_storage_indexing_queue_capacity 16384
+# HELP prometheus_local_storage_indexing_queue_length The number of metrics waiting to be indexed.
+# TYPE prometheus_local_storage_indexing_queue_length gauge
+prometheus_local_storage_indexing_queue_length 0
+# HELP prometheus_local_storage_ingested_samples_total The total number of samples ingested.
+# TYPE prometheus_local_storage_ingested_samples_total counter
+prometheus_local_storage_ingested_samples_total 30473
+# HELP prometheus_local_storage_invalid_preload_requests_total The total number of preload requests referring to a non-existent series. This is an indication of outdated label indexes.
+# TYPE prometheus_local_storage_invalid_preload_requests_total counter
+prometheus_local_storage_invalid_preload_requests_total 0
+# HELP prometheus_local_storage_memory_chunkdescs The current number of chunk descriptors in memory.
+# TYPE prometheus_local_storage_memory_chunkdescs gauge
+prometheus_local_storage_memory_chunkdescs 1059
+# HELP prometheus_local_storage_memory_chunks The current number of chunks in memory, excluding cloned chunks (i.e. chunks without a descriptor).
+# TYPE prometheus_local_storage_memory_chunks gauge
+prometheus_local_storage_memory_chunks 1020
+# HELP prometheus_local_storage_memory_series The current number of series in memory.
+# TYPE prometheus_local_storage_memory_series gauge
+prometheus_local_storage_memory_series 424
+# HELP prometheus_local_storage_persist_latency_microseconds A summary of latencies for persisting each chunk.
+# TYPE prometheus_local_storage_persist_latency_microseconds summary
+prometheus_local_storage_persist_latency_microseconds{quantile="0.5"} 30.377
+prometheus_local_storage_persist_latency_microseconds{quantile="0.9"} 203.539
+prometheus_local_storage_persist_latency_microseconds{quantile="0.99"} 2626.463
+prometheus_local_storage_persist_latency_microseconds_sum 20424.415
+prometheus_local_storage_persist_latency_microseconds_count 174
+# HELP prometheus_local_storage_persist_queue_capacity The total capacity of the persist queue.
+# TYPE prometheus_local_storage_persist_queue_capacity gauge
+prometheus_local_storage_persist_queue_capacity 1024
+# HELP prometheus_local_storage_persist_queue_length The current number of chunks waiting in the persist queue.
+# TYPE prometheus_local_storage_persist_queue_length gauge
+prometheus_local_storage_persist_queue_length 0
+# HELP prometheus_local_storage_series_ops_total The total number of series operations by their type.
+# TYPE prometheus_local_storage_series_ops_total counter
+prometheus_local_storage_series_ops_total{type="create"} 2
+prometheus_local_storage_series_ops_total{type="maintenance_in_memory"} 11
+# HELP prometheus_notifications_latency_milliseconds Latency quantiles for sending alert notifications (not including dropped notifications).
+# TYPE prometheus_notifications_latency_milliseconds summary
+prometheus_notifications_latency_milliseconds{quantile="0.5"} 0
+prometheus_notifications_latency_milliseconds{quantile="0.9"} 0
+prometheus_notifications_latency_milliseconds{quantile="0.99"} 0
+prometheus_notifications_latency_milliseconds_sum 0
+prometheus_notifications_latency_milliseconds_count 0
+# HELP prometheus_notifications_queue_capacity The capacity of the alert notifications queue.
+# TYPE prometheus_notifications_queue_capacity gauge
+prometheus_notifications_queue_capacity 100
+# HELP prometheus_notifications_queue_length The number of alert notifications in the queue.
+# TYPE prometheus_notifications_queue_length gauge
+prometheus_notifications_queue_length 0
+# HELP prometheus_rule_evaluation_duration_milliseconds The duration for a rule to execute.
+# TYPE prometheus_rule_evaluation_duration_milliseconds summary
+prometheus_rule_evaluation_duration_milliseconds{rule_type="alerting",quantile="0.5"} 0
+prometheus_rule_evaluation_duration_milliseconds{rule_type="alerting",quantile="0.9"} 0
+prometheus_rule_evaluation_duration_milliseconds{rule_type="alerting",quantile="0.99"} 2
+prometheus_rule_evaluation_duration_milliseconds_sum{rule_type="alerting"} 12
+prometheus_rule_evaluation_duration_milliseconds_count{rule_type="alerting"} 115
+prometheus_rule_evaluation_duration_milliseconds{rule_type="recording",quantile="0.5"} 0
+prometheus_rule_evaluation_duration_milliseconds{rule_type="recording",quantile="0.9"} 0
+prometheus_rule_evaluation_duration_milliseconds{rule_type="recording",quantile="0.99"} 3
+prometheus_rule_evaluation_duration_milliseconds_sum{rule_type="recording"} 15
+prometheus_rule_evaluation_duration_milliseconds_count{rule_type="recording"} 115
+# HELP prometheus_rule_evaluation_failures_total The total number of rule evaluation failures.
+# TYPE prometheus_rule_evaluation_failures_total counter
+prometheus_rule_evaluation_failures_total 0
+# HELP prometheus_samples_queue_capacity Capacity of the queue for unwritten samples.
+# TYPE prometheus_samples_queue_capacity gauge
+prometheus_samples_queue_capacity 4096
+# HELP prometheus_samples_queue_length Current number of items in the queue for unwritten samples. Each item comprises all samples exposed by one target as one metric family (i.e. metrics of the same name).
+# TYPE prometheus_samples_queue_length gauge
+prometheus_samples_queue_length 0
+# HELP prometheus_target_interval_length_seconds Actual intervals between scrapes.
+# TYPE prometheus_target_interval_length_seconds summary
+prometheus_target_interval_length_seconds{interval="15s",quantile="0.01"} 14
+prometheus_target_interval_length_seconds{interval="15s",quantile="0.05"} 14
+prometheus_target_interval_length_seconds{interval="15s",quantile="0.5"} 15
+prometheus_target_interval_length_seconds{interval="15s",quantile="0.9"} 15
+prometheus_target_interval_length_seconds{interval="15s",quantile="0.99"} 15
+prometheus_target_interval_length_seconds_sum{interval="15s"} 175
+prometheus_target_interval_length_seconds_count{interval="15s"} 12
+prometheus_target_interval_length_seconds{interval="1s",quantile="0.01"} 0
+prometheus_target_interval_length_seconds{interval="1s",quantile="0.05"} 0
+prometheus_target_interval_length_seconds{interval="1s",quantile="0.5"} 0
+prometheus_target_interval_length_seconds{interval="1s",quantile="0.9"} 1
+prometheus_target_interval_length_seconds{interval="1s",quantile="0.99"} 1
+prometheus_target_interval_length_seconds_sum{interval="1s"} 55
+prometheus_target_interval_length_seconds_count{interval="1s"} 117

gateway/vendor/github.com/prometheus/common/expfmt/text_create.go

@@ -0,0 +1,303 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"strings"
+
+	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/common/model"
+)
+
+// MetricFamilyToText converts a MetricFamily proto message into text format and
+// writes the resulting lines to 'out'. It returns the number of bytes written
+// and any error encountered. The output will have the same order as the input,
+// no further sorting is performed. Furthermore, this function assumes the input
+// is already sanitized and does not perform any sanity checks. If the input
+// contains duplicate metrics or invalid metric or label names, the conversion
+// will result in invalid text format output.
+//
+// This method fulfills the type 'prometheus.encoder'.
+func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (int, error) {
+	var written int
+
+	// Fail-fast checks.
+	if len(in.Metric) == 0 {
+		return written, fmt.Errorf("MetricFamily has no metrics: %s", in)
+	}
+	name := in.GetName()
+	if name == "" {
+		return written, fmt.Errorf("MetricFamily has no name: %s", in)
+	}
+
+	// Comments, first HELP, then TYPE.
+	if in.Help != nil {
+		n, err := fmt.Fprintf(
+			out, "# HELP %s %s\n",
+			name, escapeString(*in.Help, false),
+		)
+		written += n
+		if err != nil {
+			return written, err
+		}
+	}
+	metricType := in.GetType()
+	n, err := fmt.Fprintf(
+		out, "# TYPE %s %s\n",
+		name, strings.ToLower(metricType.String()),
+	)
+	written += n
+	if err != nil {
+		return written, err
+	}
+
+	// Finally the samples, one line for each.
+	for _, metric := range in.Metric {
+		switch metricType {
+		case dto.MetricType_COUNTER:
+			if metric.Counter == nil {
+				return written, fmt.Errorf(
+					"expected counter in metric %s %s", name, metric,
+				)
+			}
+			n, err = writeSample(
+				name, metric, "", "",
+				metric.Counter.GetValue(),
+				out,
+			)
+		case dto.MetricType_GAUGE:
+			if metric.Gauge == nil {
+				return written, fmt.Errorf(
+					"expected gauge in metric %s %s", name, metric,
+				)
+			}
+			n, err = writeSample(
+				name, metric, "", "",
+				metric.Gauge.GetValue(),
+				out,
+			)
+		case dto.MetricType_UNTYPED:
+			if metric.Untyped == nil {
+				return written, fmt.Errorf(
+					"expected untyped in metric %s %s", name, metric,
+				)
+			}
+			n, err = writeSample(
+				name, metric, "", "",
+				metric.Untyped.GetValue(),
+				out,
+			)
+		case dto.MetricType_SUMMARY:
+			if metric.Summary == nil {
+				return written, fmt.Errorf(
+					"expected summary in metric %s %s", name, metric,
+				)
+			}
+			for _, q := range metric.Summary.Quantile {
+				n, err = writeSample(
+					name, metric,
+					model.QuantileLabel, fmt.Sprint(q.GetQuantile()),
+					q.GetValue(),
+					out,
+				)
+				written += n
+				if err != nil {
+					return written, err
+				}
+			}
+			n, err = writeSample(
+				name+"_sum", metric, "", "",
+				metric.Summary.GetSampleSum(),
+				out,
+			)
+			if err != nil {
+				return written, err
+			}
+			written += n
+			n, err = writeSample(
+				name+"_count", metric, "", "",
+				float64(metric.Summary.GetSampleCount()),
+				out,
+			)
+		case dto.MetricType_HISTOGRAM:
+			if metric.Histogram == nil {
+				return written, fmt.Errorf(
+					"expected histogram in metric %s %s", name, metric,
+				)
+			}
+			infSeen := false
+			for _, q := range metric.Histogram.Bucket {
+				n, err = writeSample(
+					name+"_bucket", metric,
+					model.BucketLabel, fmt.Sprint(q.GetUpperBound()),
+					float64(q.GetCumulativeCount()),
+					out,
+				)
+				written += n
+				if err != nil {
+					return written, err
+				}
+				if math.IsInf(q.GetUpperBound(), +1) {
+					infSeen = true
+				}
+			}
+			if !infSeen {
+				n, err = writeSample(
+					name+"_bucket", metric,
+					model.BucketLabel, "+Inf",
+					float64(metric.Histogram.GetSampleCount()),
+					out,
+				)
+				if err != nil {
+					return written, err
+				}
+				written += n
+			}
+			n, err = writeSample(
+				name+"_sum", metric, "", "",
+				metric.Histogram.GetSampleSum(),
+				out,
+			)
+			if err != nil {
+				return written, err
+			}
+			written += n
+			n, err = writeSample(
+				name+"_count", metric, "", "",
+				float64(metric.Histogram.GetSampleCount()),
+				out,
+			)
+		default:
+			return written, fmt.Errorf(
+				"unexpected type in metric %s %s", name, metric,
+			)
+		}
+		written += n
+		if err != nil {
+			return written, err
+		}
+	}
+	return written, nil
+}
+
+// writeSample writes a single sample in text format to out, given the metric
+// name, the metric proto message itself, optionally an additional label name
+// and value (use empty strings if not required), and the value. The function
+// returns the number of bytes written and any error encountered.
+func writeSample(
+	name string,
+	metric *dto.Metric,
+	additionalLabelName, additionalLabelValue string,
+	value float64,
+	out io.Writer,
+) (int, error) {
+	var written int
+	n, err := fmt.Fprint(out, name)
+	written += n
+	if err != nil {
+		return written, err
+	}
+	n, err = labelPairsToText(
+		metric.Label,
+		additionalLabelName, additionalLabelValue,
+		out,
+	)
+	written += n
+	if err != nil {
+		return written, err
+	}
+	n, err = fmt.Fprintf(out, " %v", value)
+	written += n
+	if err != nil {
+		return written, err
+	}
+	if metric.TimestampMs != nil {
+		n, err = fmt.Fprintf(out, " %v", *metric.TimestampMs)
+		written += n
+		if err != nil {
+			return written, err
+		}
+	}
+	n, err = out.Write([]byte{'\n'})
+	written += n
+	if err != nil {
+		return written, err
+	}
+	return written, nil
+}
+
+// labelPairsToText converts a slice of LabelPair proto messages plus the
+// explicitly given additional label pair into text formatted as required by the
+// text format and writes it to 'out'. An empty slice in combination with an
+// empty string 'additionalLabelName' results in nothing being
+// written. Otherwise, the label pairs are written, escaped as required by the
+// text format, and enclosed in '{...}'. The function returns the number of
+// bytes written and any error encountered.
+func labelPairsToText(
+	in []*dto.LabelPair,
+	additionalLabelName, additionalLabelValue string,
+	out io.Writer,
+) (int, error) {
+	if len(in) == 0 && additionalLabelName == "" {
+		return 0, nil
+	}
+	var written int
+	separator := '{'
+	for _, lp := range in {
+		n, err := fmt.Fprintf(
+			out, `%c%s="%s"`,
+			separator, lp.GetName(), escapeString(lp.GetValue(), true),
+		)
+		written += n
+		if err != nil {
+			return written, err
+		}
+		separator = ','
+	}
+	if additionalLabelName != "" {
+		n, err := fmt.Fprintf(
+			out, `%c%s="%s"`,
+			separator, additionalLabelName,
+			escapeString(additionalLabelValue, true),
+		)
+		written += n
+		if err != nil {
+			return written, err
+		}
+	}
+	n, err := out.Write([]byte{'}'})
+	written += n
+	if err != nil {
+		return written, err
+	}
+	return written, nil
+}
+
+var (
+	escape                = strings.NewReplacer("\\", `\\`, "\n", `\n`)
+	escapeWithDoubleQuote = strings.NewReplacer("\\", `\\`, "\n", `\n`, "\"", `\"`)
+)
+
+// escapeString replaces '\' by '\\', new line character by '\n', and - if
+// includeDoubleQuote is true - '"' by '\"'.
+func escapeString(v string, includeDoubleQuote bool) string {
+	if includeDoubleQuote {
+		return escapeWithDoubleQuote.Replace(v)
+	}
+
+	return escape.Replace(v)
+}

gateway/vendor/github.com/prometheus/common/expfmt/text_create_test.go

@@ -0,0 +1,443 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"bytes"
+	"math"
+	"strings"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+
+	dto "github.com/prometheus/client_model/go"
+)
+
+func testCreate(t testing.TB) {
+	var scenarios = []struct {
+		in  *dto.MetricFamily
+		out string
+	}{
+		// 0: Counter, NaN as value, timestamp given.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("name"),
+				Help: proto.String("two-line\n doc  str\\ing"),
+				Type: dto.MetricType_COUNTER.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("labelname"),
+								Value: proto.String("val1"),
+							},
+							&dto.LabelPair{
+								Name:  proto.String("basename"),
+								Value: proto.String("basevalue"),
+							},
+						},
+						Counter: &dto.Counter{
+							Value: proto.Float64(math.NaN()),
+						},
+					},
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("labelname"),
+								Value: proto.String("val2"),
+							},
+							&dto.LabelPair{
+								Name:  proto.String("basename"),
+								Value: proto.String("basevalue"),
+							},
+						},
+						Counter: &dto.Counter{
+							Value: proto.Float64(.23),
+						},
+						TimestampMs: proto.Int64(1234567890),
+					},
+				},
+			},
+			out: `# HELP name two-line\n doc  str\\ing
+# TYPE name counter
+name{labelname="val1",basename="basevalue"} NaN
+name{labelname="val2",basename="basevalue"} 0.23 1234567890
+`,
+		},
+		// 1: Gauge, some escaping required, +Inf as value, multi-byte characters in label values.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("gauge_name"),
+				Help: proto.String("gauge\ndoc\nstr\"ing"),
+				Type: dto.MetricType_GAUGE.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("name_1"),
+								Value: proto.String("val with\nnew line"),
+							},
+							&dto.LabelPair{
+								Name:  proto.String("name_2"),
+								Value: proto.String("val with \\backslash and \"quotes\""),
+							},
+						},
+						Gauge: &dto.Gauge{
+							Value: proto.Float64(math.Inf(+1)),
+						},
+					},
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("name_1"),
+								Value: proto.String("Björn"),
+							},
+							&dto.LabelPair{
+								Name:  proto.String("name_2"),
+								Value: proto.String("佖佥"),
+							},
+						},
+						Gauge: &dto.Gauge{
+							Value: proto.Float64(3.14E42),
+						},
+					},
+				},
+			},
+			out: `# HELP gauge_name gauge\ndoc\nstr"ing
+# TYPE gauge_name gauge
+gauge_name{name_1="val with\nnew line",name_2="val with \\backslash and \"quotes\""} +Inf
+gauge_name{name_1="Björn",name_2="佖佥"} 3.14e+42
+`,
+		},
+		// 2: Untyped, no help, one sample with no labels and -Inf as value, another sample with one label.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("untyped_name"),
+				Type: dto.MetricType_UNTYPED.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Untyped: &dto.Untyped{
+							Value: proto.Float64(math.Inf(-1)),
+						},
+					},
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("name_1"),
+								Value: proto.String("value 1"),
+							},
+						},
+						Untyped: &dto.Untyped{
+							Value: proto.Float64(-1.23e-45),
+						},
+					},
+				},
+			},
+			out: `# TYPE untyped_name untyped
+untyped_name -Inf
+untyped_name{name_1="value 1"} -1.23e-45
+`,
+		},
+		// 3: Summary.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("summary_name"),
+				Help: proto.String("summary docstring"),
+				Type: dto.MetricType_SUMMARY.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Summary: &dto.Summary{
+							SampleCount: proto.Uint64(42),
+							SampleSum:   proto.Float64(-3.4567),
+							Quantile: []*dto.Quantile{
+								&dto.Quantile{
+									Quantile: proto.Float64(0.5),
+									Value:    proto.Float64(-1.23),
+								},
+								&dto.Quantile{
+									Quantile: proto.Float64(0.9),
+									Value:    proto.Float64(.2342354),
+								},
+								&dto.Quantile{
+									Quantile: proto.Float64(0.99),
+									Value:    proto.Float64(0),
+								},
+							},
+						},
+					},
+					&dto.Metric{
+						Label: []*dto.LabelPair{
+							&dto.LabelPair{
+								Name:  proto.String("name_1"),
+								Value: proto.String("value 1"),
+							},
+							&dto.LabelPair{
+								Name:  proto.String("name_2"),
+								Value: proto.String("value 2"),
+							},
+						},
+						Summary: &dto.Summary{
+							SampleCount: proto.Uint64(4711),
+							SampleSum:   proto.Float64(2010.1971),
+							Quantile: []*dto.Quantile{
+								&dto.Quantile{
+									Quantile: proto.Float64(0.5),
+									Value:    proto.Float64(1),
+								},
+								&dto.Quantile{
+									Quantile: proto.Float64(0.9),
+									Value:    proto.Float64(2),
+								},
+								&dto.Quantile{
+									Quantile: proto.Float64(0.99),
+									Value:    proto.Float64(3),
+								},
+							},
+						},
+					},
+				},
+			},
+			out: `# HELP summary_name summary docstring
+# TYPE summary_name summary
+summary_name{quantile="0.5"} -1.23
+summary_name{quantile="0.9"} 0.2342354
+summary_name{quantile="0.99"} 0
+summary_name_sum -3.4567
+summary_name_count 42
+summary_name{name_1="value 1",name_2="value 2",quantile="0.5"} 1
+summary_name{name_1="value 1",name_2="value 2",quantile="0.9"} 2
+summary_name{name_1="value 1",name_2="value 2",quantile="0.99"} 3
+summary_name_sum{name_1="value 1",name_2="value 2"} 2010.1971
+summary_name_count{name_1="value 1",name_2="value 2"} 4711
+`,
+		},
+		// 4: Histogram
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("request_duration_microseconds"),
+				Help: proto.String("The response latency."),
+				Type: dto.MetricType_HISTOGRAM.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Histogram: &dto.Histogram{
+							SampleCount: proto.Uint64(2693),
+							SampleSum:   proto.Float64(1756047.3),
+							Bucket: []*dto.Bucket{
+								&dto.Bucket{
+									UpperBound:      proto.Float64(100),
+									CumulativeCount: proto.Uint64(123),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(120),
+									CumulativeCount: proto.Uint64(412),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(144),
+									CumulativeCount: proto.Uint64(592),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(172.8),
+									CumulativeCount: proto.Uint64(1524),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(math.Inf(+1)),
+									CumulativeCount: proto.Uint64(2693),
+								},
+							},
+						},
+					},
+				},
+			},
+			out: `# HELP request_duration_microseconds The response latency.
+# TYPE request_duration_microseconds histogram
+request_duration_microseconds_bucket{le="100"} 123
+request_duration_microseconds_bucket{le="120"} 412
+request_duration_microseconds_bucket{le="144"} 592
+request_duration_microseconds_bucket{le="172.8"} 1524
+request_duration_microseconds_bucket{le="+Inf"} 2693
+request_duration_microseconds_sum 1.7560473e+06
+request_duration_microseconds_count 2693
+`,
+		},
+		// 5: Histogram with missing +Inf bucket.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("request_duration_microseconds"),
+				Help: proto.String("The response latency."),
+				Type: dto.MetricType_HISTOGRAM.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Histogram: &dto.Histogram{
+							SampleCount: proto.Uint64(2693),
+							SampleSum:   proto.Float64(1756047.3),
+							Bucket: []*dto.Bucket{
+								&dto.Bucket{
+									UpperBound:      proto.Float64(100),
+									CumulativeCount: proto.Uint64(123),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(120),
+									CumulativeCount: proto.Uint64(412),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(144),
+									CumulativeCount: proto.Uint64(592),
+								},
+								&dto.Bucket{
+									UpperBound:      proto.Float64(172.8),
+									CumulativeCount: proto.Uint64(1524),
+								},
+							},
+						},
+					},
+				},
+			},
+			out: `# HELP request_duration_microseconds The response latency.
+# TYPE request_duration_microseconds histogram
+request_duration_microseconds_bucket{le="100"} 123
+request_duration_microseconds_bucket{le="120"} 412
+request_duration_microseconds_bucket{le="144"} 592
+request_duration_microseconds_bucket{le="172.8"} 1524
+request_duration_microseconds_bucket{le="+Inf"} 2693
+request_duration_microseconds_sum 1.7560473e+06
+request_duration_microseconds_count 2693
+`,
+		},
+		// 6: No metric type, should result in default type Counter.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("name"),
+				Help: proto.String("doc string"),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Counter: &dto.Counter{
+							Value: proto.Float64(math.Inf(-1)),
+						},
+					},
+				},
+			},
+			out: `# HELP name doc string
+# TYPE name counter
+name -Inf
+`,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		out := bytes.NewBuffer(make([]byte, 0, len(scenario.out)))
+		n, err := MetricFamilyToText(out, scenario.in)
+		if err != nil {
+			t.Errorf("%d. error: %s", i, err)
+			continue
+		}
+		if expected, got := len(scenario.out), n; expected != got {
+			t.Errorf(
+				"%d. expected %d bytes written, got %d",
+				i, expected, got,
+			)
+		}
+		if expected, got := scenario.out, out.String(); expected != got {
+			t.Errorf(
+				"%d. expected out=%q, got %q",
+				i, expected, got,
+			)
+		}
+	}
+
+}
+
+func TestCreate(t *testing.T) {
+	testCreate(t)
+}
+
+func BenchmarkCreate(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testCreate(b)
+	}
+}
+
+func testCreateError(t testing.TB) {
+	var scenarios = []struct {
+		in  *dto.MetricFamily
+		err string
+	}{
+		// 0: No metric.
+		{
+			in: &dto.MetricFamily{
+				Name:   proto.String("name"),
+				Help:   proto.String("doc string"),
+				Type:   dto.MetricType_COUNTER.Enum(),
+				Metric: []*dto.Metric{},
+			},
+			err: "MetricFamily has no metrics",
+		},
+		// 1: No metric name.
+		{
+			in: &dto.MetricFamily{
+				Help: proto.String("doc string"),
+				Type: dto.MetricType_UNTYPED.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Untyped: &dto.Untyped{
+							Value: proto.Float64(math.Inf(-1)),
+						},
+					},
+				},
+			},
+			err: "MetricFamily has no name",
+		},
+		// 2: Wrong type.
+		{
+			in: &dto.MetricFamily{
+				Name: proto.String("name"),
+				Help: proto.String("doc string"),
+				Type: dto.MetricType_COUNTER.Enum(),
+				Metric: []*dto.Metric{
+					&dto.Metric{
+						Untyped: &dto.Untyped{
+							Value: proto.Float64(math.Inf(-1)),
+						},
+					},
+				},
+			},
+			err: "expected counter in metric",
+		},
+	}
+
+	for i, scenario := range scenarios {
+		var out bytes.Buffer
+		_, err := MetricFamilyToText(&out, scenario.in)
+		if err == nil {
+			t.Errorf("%d. expected error, got nil", i)
+			continue
+		}
+		if expected, got := scenario.err, err.Error(); strings.Index(got, expected) != 0 {
+			t.Errorf(
+				"%d. expected error starting with %q, got %q",
+				i, expected, got,
+			)
+		}
+	}
+
+}
+
+func TestCreateError(t *testing.T) {
+	testCreateError(t)
+}
+
+func BenchmarkCreateError(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testCreateError(b)
+	}
+}

gateway/vendor/github.com/prometheus/common/expfmt/text_parse.go

@@ -0,0 +1,753 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"math"
+	"strconv"
+	"strings"
+
+	dto "github.com/prometheus/client_model/go"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/prometheus/common/model"
+)
+
+// A stateFn is a function that represents a state in a state machine. By
+// executing it, the state is progressed to the next state. The stateFn returns
+// another stateFn, which represents the new state. The end state is represented
+// by nil.
+type stateFn func() stateFn
+
+// ParseError signals errors while parsing the simple and flat text-based
+// exchange format.
+type ParseError struct {
+	Line int
+	Msg  string
+}
+
+// Error implements the error interface.
+func (e ParseError) Error() string {
+	return fmt.Sprintf("text format parsing error in line %d: %s", e.Line, e.Msg)
+}
+
+// TextParser is used to parse the simple and flat text-based exchange format. Its
+// zero value is ready to use.
+type TextParser struct {
+	metricFamiliesByName map[string]*dto.MetricFamily
+	buf                  *bufio.Reader // Where the parsed input is read through.
+	err                  error         // Most recent error.
+	lineCount            int           // Tracks the line count for error messages.
+	currentByte          byte          // The most recent byte read.
+	currentToken         bytes.Buffer  // Re-used each time a token has to be gathered from multiple bytes.
+	currentMF            *dto.MetricFamily
+	currentMetric        *dto.Metric
+	currentLabelPair     *dto.LabelPair
+
+	// The remaining member variables are only used for summaries/histograms.
+	currentLabels map[string]string // All labels including '__name__' but excluding 'quantile'/'le'
+	// Summary specific.
+	summaries       map[uint64]*dto.Metric // Key is created with LabelsToSignature.
+	currentQuantile float64
+	// Histogram specific.
+	histograms    map[uint64]*dto.Metric // Key is created with LabelsToSignature.
+	currentBucket float64
+	// These tell us if the currently processed line ends on '_count' or
+	// '_sum' respectively and belong to a summary/histogram, representing the sample
+	// count and sum of that summary/histogram.
+	currentIsSummaryCount, currentIsSummarySum     bool
+	currentIsHistogramCount, currentIsHistogramSum bool
+}
+
+// TextToMetricFamilies reads 'in' as the simple and flat text-based exchange
+// format and creates MetricFamily proto messages. It returns the MetricFamily
+// proto messages in a map where the metric names are the keys, along with any
+// error encountered.
+//
+// If the input contains duplicate metrics (i.e. lines with the same metric name
+// and exactly the same label set), the resulting MetricFamily will contain
+// duplicate Metric proto messages. Similar is true for duplicate label
+// names. Checks for duplicates have to be performed separately, if required.
+// Also note that neither the metrics within each MetricFamily are sorted nor
+// the label pairs within each Metric. Sorting is not required for the most
+// frequent use of this method, which is sample ingestion in the Prometheus
+// server. However, for presentation purposes, you might want to sort the
+// metrics, and in some cases, you must sort the labels, e.g. for consumption by
+// the metric family injection hook of the Prometheus registry.
+//
+// Summaries and histograms are rather special beasts. You would probably not
+// use them in the simple text format anyway. This method can deal with
+// summaries and histograms if they are presented in exactly the way the
+// text.Create function creates them.
+//
+// This method must not be called concurrently. If you want to parse different
+// input concurrently, instantiate a separate Parser for each goroutine.
+func (p *TextParser) TextToMetricFamilies(in io.Reader) (map[string]*dto.MetricFamily, error) {
+	p.reset(in)
+	for nextState := p.startOfLine; nextState != nil; nextState = nextState() {
+		// Magic happens here...
+	}
+	// Get rid of empty metric families.
+	for k, mf := range p.metricFamiliesByName {
+		if len(mf.GetMetric()) == 0 {
+			delete(p.metricFamiliesByName, k)
+		}
+	}
+	// If p.err is io.EOF now, we have run into a premature end of the input
+	// stream. Turn this error into something nicer and more
+	// meaningful. (io.EOF is often used as a signal for the legitimate end
+	// of an input stream.)
+	if p.err == io.EOF {
+		p.parseError("unexpected end of input stream")
+	}
+	return p.metricFamiliesByName, p.err
+}
+
+func (p *TextParser) reset(in io.Reader) {
+	p.metricFamiliesByName = map[string]*dto.MetricFamily{}
+	if p.buf == nil {
+		p.buf = bufio.NewReader(in)
+	} else {
+		p.buf.Reset(in)
+	}
+	p.err = nil
+	p.lineCount = 0
+	if p.summaries == nil || len(p.summaries) > 0 {
+		p.summaries = map[uint64]*dto.Metric{}
+	}
+	if p.histograms == nil || len(p.histograms) > 0 {
+		p.histograms = map[uint64]*dto.Metric{}
+	}
+	p.currentQuantile = math.NaN()
+	p.currentBucket = math.NaN()
+}
+
+// startOfLine represents the state where the next byte read from p.buf is the
+// start of a line (or whitespace leading up to it).
+func (p *TextParser) startOfLine() stateFn {
+	p.lineCount++
+	if p.skipBlankTab(); p.err != nil {
+		// End of input reached. This is the only case where
+		// that is not an error but a signal that we are done.
+		p.err = nil
+		return nil
+	}
+	switch p.currentByte {
+	case '#':
+		return p.startComment
+	case '\n':
+		return p.startOfLine // Empty line, start the next one.
+	}
+	return p.readingMetricName
+}
+
+// startComment represents the state where the next byte read from p.buf is the
+// start of a comment (or whitespace leading up to it).
+func (p *TextParser) startComment() stateFn {
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte == '\n' {
+		return p.startOfLine
+	}
+	if p.readTokenUntilWhitespace(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	// If we have hit the end of line already, there is nothing left
+	// to do. This is not considered a syntax error.
+	if p.currentByte == '\n' {
+		return p.startOfLine
+	}
+	keyword := p.currentToken.String()
+	if keyword != "HELP" && keyword != "TYPE" {
+		// Generic comment, ignore by fast forwarding to end of line.
+		for p.currentByte != '\n' {
+			if p.currentByte, p.err = p.buf.ReadByte(); p.err != nil {
+				return nil // Unexpected end of input.
+			}
+		}
+		return p.startOfLine
+	}
+	// There is something. Next has to be a metric name.
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.readTokenAsMetricName(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte == '\n' {
+		// At the end of the line already.
+		// Again, this is not considered a syntax error.
+		return p.startOfLine
+	}
+	if !isBlankOrTab(p.currentByte) {
+		p.parseError("invalid metric name in comment")
+		return nil
+	}
+	p.setOrCreateCurrentMF()
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte == '\n' {
+		// At the end of the line already.
+		// Again, this is not considered a syntax error.
+		return p.startOfLine
+	}
+	switch keyword {
+	case "HELP":
+		return p.readingHelp
+	case "TYPE":
+		return p.readingType
+	}
+	panic(fmt.Sprintf("code error: unexpected keyword %q", keyword))
+}
+
+// readingMetricName represents the state where the last byte read (now in
+// p.currentByte) is the first byte of a metric name.
+func (p *TextParser) readingMetricName() stateFn {
+	if p.readTokenAsMetricName(); p.err != nil {
+		return nil
+	}
+	if p.currentToken.Len() == 0 {
+		p.parseError("invalid metric name")
+		return nil
+	}
+	p.setOrCreateCurrentMF()
+	// Now is the time to fix the type if it hasn't happened yet.
+	if p.currentMF.Type == nil {
+		p.currentMF.Type = dto.MetricType_UNTYPED.Enum()
+	}
+	p.currentMetric = &dto.Metric{}
+	// Do not append the newly created currentMetric to
+	// currentMF.Metric right now. First wait if this is a summary,
+	// and the metric exists already, which we can only know after
+	// having read all the labels.
+	if p.skipBlankTabIfCurrentBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	return p.readingLabels
+}
+
+// readingLabels represents the state where the last byte read (now in
+// p.currentByte) is either the first byte of the label set (i.e. a '{'), or the
+// first byte of the value (otherwise).
+func (p *TextParser) readingLabels() stateFn {
+	// Summaries/histograms are special. We have to reset the
+	// currentLabels map, currentQuantile and currentBucket before starting to
+	// read labels.
+	if p.currentMF.GetType() == dto.MetricType_SUMMARY || p.currentMF.GetType() == dto.MetricType_HISTOGRAM {
+		p.currentLabels = map[string]string{}
+		p.currentLabels[string(model.MetricNameLabel)] = p.currentMF.GetName()
+		p.currentQuantile = math.NaN()
+		p.currentBucket = math.NaN()
+	}
+	if p.currentByte != '{' {
+		return p.readingValue
+	}
+	return p.startLabelName
+}
+
+// startLabelName represents the state where the next byte read from p.buf is
+// the start of a label name (or whitespace leading up to it).
+func (p *TextParser) startLabelName() stateFn {
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte == '}' {
+		if p.skipBlankTab(); p.err != nil {
+			return nil // Unexpected end of input.
+		}
+		return p.readingValue
+	}
+	if p.readTokenAsLabelName(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentToken.Len() == 0 {
+		p.parseError(fmt.Sprintf("invalid label name for metric %q", p.currentMF.GetName()))
+		return nil
+	}
+	p.currentLabelPair = &dto.LabelPair{Name: proto.String(p.currentToken.String())}
+	if p.currentLabelPair.GetName() == string(model.MetricNameLabel) {
+		p.parseError(fmt.Sprintf("label name %q is reserved", model.MetricNameLabel))
+		return nil
+	}
+	// Special summary/histogram treatment. Don't add 'quantile' and 'le'
+	// labels to 'real' labels.
+	if !(p.currentMF.GetType() == dto.MetricType_SUMMARY && p.currentLabelPair.GetName() == model.QuantileLabel) &&
+		!(p.currentMF.GetType() == dto.MetricType_HISTOGRAM && p.currentLabelPair.GetName() == model.BucketLabel) {
+		p.currentMetric.Label = append(p.currentMetric.Label, p.currentLabelPair)
+	}
+	if p.skipBlankTabIfCurrentBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte != '=' {
+		p.parseError(fmt.Sprintf("expected '=' after label name, found %q", p.currentByte))
+		return nil
+	}
+	return p.startLabelValue
+}
+
+// startLabelValue represents the state where the next byte read from p.buf is
+// the start of a (quoted) label value (or whitespace leading up to it).
+func (p *TextParser) startLabelValue() stateFn {
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentByte != '"' {
+		p.parseError(fmt.Sprintf("expected '\"' at start of label value, found %q", p.currentByte))
+		return nil
+	}
+	if p.readTokenAsLabelValue(); p.err != nil {
+		return nil
+	}
+	p.currentLabelPair.Value = proto.String(p.currentToken.String())
+	// Special treatment of summaries:
+	// - Quantile labels are special, will result in dto.Quantile later.
+	// - Other labels have to be added to currentLabels for signature calculation.
+	if p.currentMF.GetType() == dto.MetricType_SUMMARY {
+		if p.currentLabelPair.GetName() == model.QuantileLabel {
+			if p.currentQuantile, p.err = strconv.ParseFloat(p.currentLabelPair.GetValue(), 64); p.err != nil {
+				// Create a more helpful error message.
+				p.parseError(fmt.Sprintf("expected float as value for 'quantile' label, got %q", p.currentLabelPair.GetValue()))
+				return nil
+			}
+		} else {
+			p.currentLabels[p.currentLabelPair.GetName()] = p.currentLabelPair.GetValue()
+		}
+	}
+	// Similar special treatment of histograms.
+	if p.currentMF.GetType() == dto.MetricType_HISTOGRAM {
+		if p.currentLabelPair.GetName() == model.BucketLabel {
+			if p.currentBucket, p.err = strconv.ParseFloat(p.currentLabelPair.GetValue(), 64); p.err != nil {
+				// Create a more helpful error message.
+				p.parseError(fmt.Sprintf("expected float as value for 'le' label, got %q", p.currentLabelPair.GetValue()))
+				return nil
+			}
+		} else {
+			p.currentLabels[p.currentLabelPair.GetName()] = p.currentLabelPair.GetValue()
+		}
+	}
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	switch p.currentByte {
+	case ',':
+		return p.startLabelName
+
+	case '}':
+		if p.skipBlankTab(); p.err != nil {
+			return nil // Unexpected end of input.
+		}
+		return p.readingValue
+	default:
+		p.parseError(fmt.Sprintf("unexpected end of label value %q", p.currentLabelPair.Value))
+		return nil
+	}
+}
+
+// readingValue represents the state where the last byte read (now in
+// p.currentByte) is the first byte of the sample value (i.e. a float).
+func (p *TextParser) readingValue() stateFn {
+	// When we are here, we have read all the labels, so for the
+	// special case of a summary/histogram, we can finally find out
+	// if the metric already exists.
+	if p.currentMF.GetType() == dto.MetricType_SUMMARY {
+		signature := model.LabelsToSignature(p.currentLabels)
+		if summary := p.summaries[signature]; summary != nil {
+			p.currentMetric = summary
+		} else {
+			p.summaries[signature] = p.currentMetric
+			p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
+		}
+	} else if p.currentMF.GetType() == dto.MetricType_HISTOGRAM {
+		signature := model.LabelsToSignature(p.currentLabels)
+		if histogram := p.histograms[signature]; histogram != nil {
+			p.currentMetric = histogram
+		} else {
+			p.histograms[signature] = p.currentMetric
+			p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
+		}
+	} else {
+		p.currentMF.Metric = append(p.currentMF.Metric, p.currentMetric)
+	}
+	if p.readTokenUntilWhitespace(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	value, err := strconv.ParseFloat(p.currentToken.String(), 64)
+	if err != nil {
+		// Create a more helpful error message.
+		p.parseError(fmt.Sprintf("expected float as value, got %q", p.currentToken.String()))
+		return nil
+	}
+	switch p.currentMF.GetType() {
+	case dto.MetricType_COUNTER:
+		p.currentMetric.Counter = &dto.Counter{Value: proto.Float64(value)}
+	case dto.MetricType_GAUGE:
+		p.currentMetric.Gauge = &dto.Gauge{Value: proto.Float64(value)}
+	case dto.MetricType_UNTYPED:
+		p.currentMetric.Untyped = &dto.Untyped{Value: proto.Float64(value)}
+	case dto.MetricType_SUMMARY:
+		// *sigh*
+		if p.currentMetric.Summary == nil {
+			p.currentMetric.Summary = &dto.Summary{}
+		}
+		switch {
+		case p.currentIsSummaryCount:
+			p.currentMetric.Summary.SampleCount = proto.Uint64(uint64(value))
+		case p.currentIsSummarySum:
+			p.currentMetric.Summary.SampleSum = proto.Float64(value)
+		case !math.IsNaN(p.currentQuantile):
+			p.currentMetric.Summary.Quantile = append(
+				p.currentMetric.Summary.Quantile,
+				&dto.Quantile{
+					Quantile: proto.Float64(p.currentQuantile),
+					Value:    proto.Float64(value),
+				},
+			)
+		}
+	case dto.MetricType_HISTOGRAM:
+		// *sigh*
+		if p.currentMetric.Histogram == nil {
+			p.currentMetric.Histogram = &dto.Histogram{}
+		}
+		switch {
+		case p.currentIsHistogramCount:
+			p.currentMetric.Histogram.SampleCount = proto.Uint64(uint64(value))
+		case p.currentIsHistogramSum:
+			p.currentMetric.Histogram.SampleSum = proto.Float64(value)
+		case !math.IsNaN(p.currentBucket):
+			p.currentMetric.Histogram.Bucket = append(
+				p.currentMetric.Histogram.Bucket,
+				&dto.Bucket{
+					UpperBound:      proto.Float64(p.currentBucket),
+					CumulativeCount: proto.Uint64(uint64(value)),
+				},
+			)
+		}
+	default:
+		p.err = fmt.Errorf("unexpected type for metric name %q", p.currentMF.GetName())
+	}
+	if p.currentByte == '\n' {
+		return p.startOfLine
+	}
+	return p.startTimestamp
+}
+
+// startTimestamp represents the state where the next byte read from p.buf is
+// the start of the timestamp (or whitespace leading up to it).
+func (p *TextParser) startTimestamp() stateFn {
+	if p.skipBlankTab(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.readTokenUntilWhitespace(); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	timestamp, err := strconv.ParseInt(p.currentToken.String(), 10, 64)
+	if err != nil {
+		// Create a more helpful error message.
+		p.parseError(fmt.Sprintf("expected integer as timestamp, got %q", p.currentToken.String()))
+		return nil
+	}
+	p.currentMetric.TimestampMs = proto.Int64(timestamp)
+	if p.readTokenUntilNewline(false); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	if p.currentToken.Len() > 0 {
+		p.parseError(fmt.Sprintf("spurious string after timestamp: %q", p.currentToken.String()))
+		return nil
+	}
+	return p.startOfLine
+}
+
+// readingHelp represents the state where the last byte read (now in
+// p.currentByte) is the first byte of the docstring after 'HELP'.
+func (p *TextParser) readingHelp() stateFn {
+	if p.currentMF.Help != nil {
+		p.parseError(fmt.Sprintf("second HELP line for metric name %q", p.currentMF.GetName()))
+		return nil
+	}
+	// Rest of line is the docstring.
+	if p.readTokenUntilNewline(true); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	p.currentMF.Help = proto.String(p.currentToken.String())
+	return p.startOfLine
+}
+
+// readingType represents the state where the last byte read (now in
+// p.currentByte) is the first byte of the type hint after 'HELP'.
+func (p *TextParser) readingType() stateFn {
+	if p.currentMF.Type != nil {
+		p.parseError(fmt.Sprintf("second TYPE line for metric name %q, or TYPE reported after samples", p.currentMF.GetName()))
+		return nil
+	}
+	// Rest of line is the type.
+	if p.readTokenUntilNewline(false); p.err != nil {
+		return nil // Unexpected end of input.
+	}
+	metricType, ok := dto.MetricType_value[strings.ToUpper(p.currentToken.String())]
+	if !ok {
+		p.parseError(fmt.Sprintf("unknown metric type %q", p.currentToken.String()))
+		return nil
+	}
+	p.currentMF.Type = dto.MetricType(metricType).Enum()
+	return p.startOfLine
+}
+
+// parseError sets p.err to a ParseError at the current line with the given
+// message.
+func (p *TextParser) parseError(msg string) {
+	p.err = ParseError{
+		Line: p.lineCount,
+		Msg:  msg,
+	}
+}
+
+// skipBlankTab reads (and discards) bytes from p.buf until it encounters a byte
+// that is neither ' ' nor '\t'. That byte is left in p.currentByte.
+func (p *TextParser) skipBlankTab() {
+	for {
+		if p.currentByte, p.err = p.buf.ReadByte(); p.err != nil || !isBlankOrTab(p.currentByte) {
+			return
+		}
+	}
+}
+
+// skipBlankTabIfCurrentBlankTab works exactly as skipBlankTab but doesn't do
+// anything if p.currentByte is neither ' ' nor '\t'.
+func (p *TextParser) skipBlankTabIfCurrentBlankTab() {
+	if isBlankOrTab(p.currentByte) {
+		p.skipBlankTab()
+	}
+}
+
+// readTokenUntilWhitespace copies bytes from p.buf into p.currentToken.  The
+// first byte considered is the byte already read (now in p.currentByte).  The
+// first whitespace byte encountered is still copied into p.currentByte, but not
+// into p.currentToken.
+func (p *TextParser) readTokenUntilWhitespace() {
+	p.currentToken.Reset()
+	for p.err == nil && !isBlankOrTab(p.currentByte) && p.currentByte != '\n' {
+		p.currentToken.WriteByte(p.currentByte)
+		p.currentByte, p.err = p.buf.ReadByte()
+	}
+}
+
+// readTokenUntilNewline copies bytes from p.buf into p.currentToken.  The first
+// byte considered is the byte already read (now in p.currentByte).  The first
+// newline byte encountered is still copied into p.currentByte, but not into
+// p.currentToken. If recognizeEscapeSequence is true, two escape sequences are
+// recognized: '\\' tranlates into '\', and '\n' into a line-feed character. All
+// other escape sequences are invalid and cause an error.
+func (p *TextParser) readTokenUntilNewline(recognizeEscapeSequence bool) {
+	p.currentToken.Reset()
+	escaped := false
+	for p.err == nil {
+		if recognizeEscapeSequence && escaped {
+			switch p.currentByte {
+			case '\\':
+				p.currentToken.WriteByte(p.currentByte)
+			case 'n':
+				p.currentToken.WriteByte('\n')
+			default:
+				p.parseError(fmt.Sprintf("invalid escape sequence '\\%c'", p.currentByte))
+				return
+			}
+			escaped = false
+		} else {
+			switch p.currentByte {
+			case '\n':
+				return
+			case '\\':
+				escaped = true
+			default:
+				p.currentToken.WriteByte(p.currentByte)
+			}
+		}
+		p.currentByte, p.err = p.buf.ReadByte()
+	}
+}
+
+// readTokenAsMetricName copies a metric name from p.buf into p.currentToken.
+// The first byte considered is the byte already read (now in p.currentByte).
+// The first byte not part of a metric name is still copied into p.currentByte,
+// but not into p.currentToken.
+func (p *TextParser) readTokenAsMetricName() {
+	p.currentToken.Reset()
+	if !isValidMetricNameStart(p.currentByte) {
+		return
+	}
+	for {
+		p.currentToken.WriteByte(p.currentByte)
+		p.currentByte, p.err = p.buf.ReadByte()
+		if p.err != nil || !isValidMetricNameContinuation(p.currentByte) {
+			return
+		}
+	}
+}
+
+// readTokenAsLabelName copies a label name from p.buf into p.currentToken.
+// The first byte considered is the byte already read (now in p.currentByte).
+// The first byte not part of a label name is still copied into p.currentByte,
+// but not into p.currentToken.
+func (p *TextParser) readTokenAsLabelName() {
+	p.currentToken.Reset()
+	if !isValidLabelNameStart(p.currentByte) {
+		return
+	}
+	for {
+		p.currentToken.WriteByte(p.currentByte)
+		p.currentByte, p.err = p.buf.ReadByte()
+		if p.err != nil || !isValidLabelNameContinuation(p.currentByte) {
+			return
+		}
+	}
+}
+
+// readTokenAsLabelValue copies a label value from p.buf into p.currentToken.
+// In contrast to the other 'readTokenAs...' functions, which start with the
+// last read byte in p.currentByte, this method ignores p.currentByte and starts
+// with reading a new byte from p.buf. The first byte not part of a label value
+// is still copied into p.currentByte, but not into p.currentToken.
+func (p *TextParser) readTokenAsLabelValue() {
+	p.currentToken.Reset()
+	escaped := false
+	for {
+		if p.currentByte, p.err = p.buf.ReadByte(); p.err != nil {
+			return
+		}
+		if escaped {
+			switch p.currentByte {
+			case '"', '\\':
+				p.currentToken.WriteByte(p.currentByte)
+			case 'n':
+				p.currentToken.WriteByte('\n')
+			default:
+				p.parseError(fmt.Sprintf("invalid escape sequence '\\%c'", p.currentByte))
+				return
+			}
+			escaped = false
+			continue
+		}
+		switch p.currentByte {
+		case '"':
+			return
+		case '\n':
+			p.parseError(fmt.Sprintf("label value %q contains unescaped new-line", p.currentToken.String()))
+			return
+		case '\\':
+			escaped = true
+		default:
+			p.currentToken.WriteByte(p.currentByte)
+		}
+	}
+}
+
+func (p *TextParser) setOrCreateCurrentMF() {
+	p.currentIsSummaryCount = false
+	p.currentIsSummarySum = false
+	p.currentIsHistogramCount = false
+	p.currentIsHistogramSum = false
+	name := p.currentToken.String()
+	if p.currentMF = p.metricFamiliesByName[name]; p.currentMF != nil {
+		return
+	}
+	// Try out if this is a _sum or _count for a summary/histogram.
+	summaryName := summaryMetricName(name)
+	if p.currentMF = p.metricFamiliesByName[summaryName]; p.currentMF != nil {
+		if p.currentMF.GetType() == dto.MetricType_SUMMARY {
+			if isCount(name) {
+				p.currentIsSummaryCount = true
+			}
+			if isSum(name) {
+				p.currentIsSummarySum = true
+			}
+			return
+		}
+	}
+	histogramName := histogramMetricName(name)
+	if p.currentMF = p.metricFamiliesByName[histogramName]; p.currentMF != nil {
+		if p.currentMF.GetType() == dto.MetricType_HISTOGRAM {
+			if isCount(name) {
+				p.currentIsHistogramCount = true
+			}
+			if isSum(name) {
+				p.currentIsHistogramSum = true
+			}
+			return
+		}
+	}
+	p.currentMF = &dto.MetricFamily{Name: proto.String(name)}
+	p.metricFamiliesByName[name] = p.currentMF
+}
+
+func isValidLabelNameStart(b byte) bool {
+	return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_'
+}
+
+func isValidLabelNameContinuation(b byte) bool {
+	return isValidLabelNameStart(b) || (b >= '0' && b <= '9')
+}
+
+func isValidMetricNameStart(b byte) bool {
+	return isValidLabelNameStart(b) || b == ':'
+}
+
+func isValidMetricNameContinuation(b byte) bool {
+	return isValidLabelNameContinuation(b) || b == ':'
+}
+
+func isBlankOrTab(b byte) bool {
+	return b == ' ' || b == '\t'
+}
+
+func isCount(name string) bool {
+	return len(name) > 6 && name[len(name)-6:] == "_count"
+}
+
+func isSum(name string) bool {
+	return len(name) > 4 && name[len(name)-4:] == "_sum"
+}
+
+func isBucket(name string) bool {
+	return len(name) > 7 && name[len(name)-7:] == "_bucket"
+}
+
+func summaryMetricName(name string) string {
+	switch {
+	case isCount(name):
+		return name[:len(name)-6]
+	case isSum(name):
+		return name[:len(name)-4]
+	default:
+		return name
+	}
+}
+
+func histogramMetricName(name string) string {
+	switch {
+	case isCount(name):
+		return name[:len(name)-6]
+	case isSum(name):
+		return name[:len(name)-4]
+	case isBucket(name):
+		return name[:len(name)-7]
+	default:
+		return name
+	}
+}

gateway/vendor/github.com/prometheus/common/expfmt/text_parse_test.go

@@ -0,0 +1,588 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package expfmt
+
+import (
+	"math"
+	"strings"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+	dto "github.com/prometheus/client_model/go"
+)
+
+func testTextParse(t testing.TB) {
+	var scenarios = []struct {
+		in  string
+		out []*dto.MetricFamily
+	}{
+		// 0: Empty lines as input.
+		{
+			in: `
+
+`,
+			out: []*dto.MetricFamily{},
+		},
+		// 1: Minimal case.
+		{
+			in: `
+minimal_metric 1.234
+another_metric -3e3 103948
+# Even that:
+no_labels{} 3
+# HELP line for non-existing metric will be ignored.
+`,
+			out: []*dto.MetricFamily{
+				&dto.MetricFamily{
+					Name: proto.String("minimal_metric"),
+					Type: dto.MetricType_UNTYPED.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Untyped: &dto.Untyped{
+								Value: proto.Float64(1.234),
+							},
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("another_metric"),
+					Type: dto.MetricType_UNTYPED.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Untyped: &dto.Untyped{
+								Value: proto.Float64(-3e3),
+							},
+							TimestampMs: proto.Int64(103948),
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("no_labels"),
+					Type: dto.MetricType_UNTYPED.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Untyped: &dto.Untyped{
+								Value: proto.Float64(3),
+							},
+						},
+					},
+				},
+			},
+		},
+		// 2: Counters & gauges, docstrings, various whitespace, escape sequences.
+		{
+			in: `
+# A normal comment.
+#
+# TYPE name counter
+name{labelname="val1",basename="basevalue"} NaN
+name {labelname="val2",basename="base\"v\\al\nue"} 0.23 1234567890
+# HELP name two-line\n doc  str\\ing
+
+ # HELP  name2  	doc str"ing 2
+  #    TYPE    name2 gauge
+name2{labelname="val2"	,basename   =   "basevalue2"		} +Inf 54321
+name2{ labelname = "val1" , }-Inf
+`,
+			out: []*dto.MetricFamily{
+				&dto.MetricFamily{
+					Name: proto.String("name"),
+					Help: proto.String("two-line\n doc  str\\ing"),
+					Type: dto.MetricType_COUNTER.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("labelname"),
+									Value: proto.String("val1"),
+								},
+								&dto.LabelPair{
+									Name:  proto.String("basename"),
+									Value: proto.String("basevalue"),
+								},
+							},
+							Counter: &dto.Counter{
+								Value: proto.Float64(math.NaN()),
+							},
+						},
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("labelname"),
+									Value: proto.String("val2"),
+								},
+								&dto.LabelPair{
+									Name:  proto.String("basename"),
+									Value: proto.String("base\"v\\al\nue"),
+								},
+							},
+							Counter: &dto.Counter{
+								Value: proto.Float64(.23),
+							},
+							TimestampMs: proto.Int64(1234567890),
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("name2"),
+					Help: proto.String("doc str\"ing 2"),
+					Type: dto.MetricType_GAUGE.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("labelname"),
+									Value: proto.String("val2"),
+								},
+								&dto.LabelPair{
+									Name:  proto.String("basename"),
+									Value: proto.String("basevalue2"),
+								},
+							},
+							Gauge: &dto.Gauge{
+								Value: proto.Float64(math.Inf(+1)),
+							},
+							TimestampMs: proto.Int64(54321),
+						},
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("labelname"),
+									Value: proto.String("val1"),
+								},
+							},
+							Gauge: &dto.Gauge{
+								Value: proto.Float64(math.Inf(-1)),
+							},
+						},
+					},
+				},
+			},
+		},
+		// 3: The evil summary, mixed with other types and funny comments.
+		{
+			in: `
+# TYPE my_summary summary
+my_summary{n1="val1",quantile="0.5"} 110
+decoy -1 -2
+my_summary{n1="val1",quantile="0.9"} 140 1
+my_summary_count{n1="val1"} 42
+# Latest timestamp wins in case of a summary.
+my_summary_sum{n1="val1"} 4711 2
+fake_sum{n1="val1"} 2001
+# TYPE another_summary summary
+another_summary_count{n2="val2",n1="val1"} 20
+my_summary_count{n2="val2",n1="val1"} 5 5
+another_summary{n1="val1",n2="val2",quantile=".3"} -1.2
+my_summary_sum{n1="val2"} 08 15
+my_summary{n1="val3", quantile="0.2"} 4711
+  my_summary{n1="val1",n2="val2",quantile="-12.34",} NaN
+# some
+# funny comments
+# HELP 
+# HELP
+# HELP my_summary
+# HELP my_summary 
+`,
+			out: []*dto.MetricFamily{
+				&dto.MetricFamily{
+					Name: proto.String("fake_sum"),
+					Type: dto.MetricType_UNTYPED.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val1"),
+								},
+							},
+							Untyped: &dto.Untyped{
+								Value: proto.Float64(2001),
+							},
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("decoy"),
+					Type: dto.MetricType_UNTYPED.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Untyped: &dto.Untyped{
+								Value: proto.Float64(-1),
+							},
+							TimestampMs: proto.Int64(-2),
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("my_summary"),
+					Type: dto.MetricType_SUMMARY.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val1"),
+								},
+							},
+							Summary: &dto.Summary{
+								SampleCount: proto.Uint64(42),
+								SampleSum:   proto.Float64(4711),
+								Quantile: []*dto.Quantile{
+									&dto.Quantile{
+										Quantile: proto.Float64(0.5),
+										Value:    proto.Float64(110),
+									},
+									&dto.Quantile{
+										Quantile: proto.Float64(0.9),
+										Value:    proto.Float64(140),
+									},
+								},
+							},
+							TimestampMs: proto.Int64(2),
+						},
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n2"),
+									Value: proto.String("val2"),
+								},
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val1"),
+								},
+							},
+							Summary: &dto.Summary{
+								SampleCount: proto.Uint64(5),
+								Quantile: []*dto.Quantile{
+									&dto.Quantile{
+										Quantile: proto.Float64(-12.34),
+										Value:    proto.Float64(math.NaN()),
+									},
+								},
+							},
+							TimestampMs: proto.Int64(5),
+						},
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val2"),
+								},
+							},
+							Summary: &dto.Summary{
+								SampleSum: proto.Float64(8),
+							},
+							TimestampMs: proto.Int64(15),
+						},
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val3"),
+								},
+							},
+							Summary: &dto.Summary{
+								Quantile: []*dto.Quantile{
+									&dto.Quantile{
+										Quantile: proto.Float64(0.2),
+										Value:    proto.Float64(4711),
+									},
+								},
+							},
+						},
+					},
+				},
+				&dto.MetricFamily{
+					Name: proto.String("another_summary"),
+					Type: dto.MetricType_SUMMARY.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Label: []*dto.LabelPair{
+								&dto.LabelPair{
+									Name:  proto.String("n2"),
+									Value: proto.String("val2"),
+								},
+								&dto.LabelPair{
+									Name:  proto.String("n1"),
+									Value: proto.String("val1"),
+								},
+							},
+							Summary: &dto.Summary{
+								SampleCount: proto.Uint64(20),
+								Quantile: []*dto.Quantile{
+									&dto.Quantile{
+										Quantile: proto.Float64(0.3),
+										Value:    proto.Float64(-1.2),
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+		// 4: The histogram.
+		{
+			in: `
+# HELP request_duration_microseconds The response latency.
+# TYPE request_duration_microseconds histogram
+request_duration_microseconds_bucket{le="100"} 123
+request_duration_microseconds_bucket{le="120"} 412
+request_duration_microseconds_bucket{le="144"} 592
+request_duration_microseconds_bucket{le="172.8"} 1524
+request_duration_microseconds_bucket{le="+Inf"} 2693
+request_duration_microseconds_sum 1.7560473e+06
+request_duration_microseconds_count 2693
+`,
+			out: []*dto.MetricFamily{
+				{
+					Name: proto.String("request_duration_microseconds"),
+					Help: proto.String("The response latency."),
+					Type: dto.MetricType_HISTOGRAM.Enum(),
+					Metric: []*dto.Metric{
+						&dto.Metric{
+							Histogram: &dto.Histogram{
+								SampleCount: proto.Uint64(2693),
+								SampleSum:   proto.Float64(1756047.3),
+								Bucket: []*dto.Bucket{
+									&dto.Bucket{
+										UpperBound:      proto.Float64(100),
+										CumulativeCount: proto.Uint64(123),
+									},
+									&dto.Bucket{
+										UpperBound:      proto.Float64(120),
+										CumulativeCount: proto.Uint64(412),
+									},
+									&dto.Bucket{
+										UpperBound:      proto.Float64(144),
+										CumulativeCount: proto.Uint64(592),
+									},
+									&dto.Bucket{
+										UpperBound:      proto.Float64(172.8),
+										CumulativeCount: proto.Uint64(1524),
+									},
+									&dto.Bucket{
+										UpperBound:      proto.Float64(math.Inf(+1)),
+										CumulativeCount: proto.Uint64(2693),
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for i, scenario := range scenarios {
+		out, err := parser.TextToMetricFamilies(strings.NewReader(scenario.in))
+		if err != nil {
+			t.Errorf("%d. error: %s", i, err)
+			continue
+		}
+		if expected, got := len(scenario.out), len(out); expected != got {
+			t.Errorf(
+				"%d. expected %d MetricFamilies, got %d",
+				i, expected, got,
+			)
+		}
+		for _, expected := range scenario.out {
+			got, ok := out[expected.GetName()]
+			if !ok {
+				t.Errorf(
+					"%d. expected MetricFamily %q, found none",
+					i, expected.GetName(),
+				)
+				continue
+			}
+			if expected.String() != got.String() {
+				t.Errorf(
+					"%d. expected MetricFamily %s, got %s",
+					i, expected, got,
+				)
+			}
+		}
+	}
+}
+
+func TestTextParse(t *testing.T) {
+	testTextParse(t)
+}
+
+func BenchmarkTextParse(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testTextParse(b)
+	}
+}
+
+func testTextParseError(t testing.TB) {
+	var scenarios = []struct {
+		in  string
+		err string
+	}{
+		// 0: No new-line at end of input.
+		{
+			in: `
+bla 3.14
+blubber 42`,
+			err: "text format parsing error in line 3: unexpected end of input stream",
+		},
+		// 1: Invalid escape sequence in label value.
+		{
+			in:  `metric{label="\t"} 3.14`,
+			err: "text format parsing error in line 1: invalid escape sequence",
+		},
+		// 2: Newline in label value.
+		{
+			in: `
+metric{label="new
+line"} 3.14
+`,
+			err: `text format parsing error in line 2: label value "new" contains unescaped new-line`,
+		},
+		// 3:
+		{
+			in:  `metric{@="bla"} 3.14`,
+			err: "text format parsing error in line 1: invalid label name for metric",
+		},
+		// 4:
+		{
+			in:  `metric{__name__="bla"} 3.14`,
+			err: `text format parsing error in line 1: label name "__name__" is reserved`,
+		},
+		// 5:
+		{
+			in:  `metric{label+="bla"} 3.14`,
+			err: "text format parsing error in line 1: expected '=' after label name",
+		},
+		// 6:
+		{
+			in:  `metric{label=bla} 3.14`,
+			err: "text format parsing error in line 1: expected '\"' at start of label value",
+		},
+		// 7:
+		{
+			in: `
+# TYPE metric summary
+metric{quantile="bla"} 3.14
+`,
+			err: "text format parsing error in line 3: expected float as value for 'quantile' label",
+		},
+		// 8:
+		{
+			in:  `metric{label="bla"+} 3.14`,
+			err: "text format parsing error in line 1: unexpected end of label value",
+		},
+		// 9:
+		{
+			in: `metric{label="bla"} 3.14 2.72
+`,
+			err: "text format parsing error in line 1: expected integer as timestamp",
+		},
+		// 10:
+		{
+			in: `metric{label="bla"} 3.14 2 3
+`,
+			err: "text format parsing error in line 1: spurious string after timestamp",
+		},
+		// 11:
+		{
+			in: `metric{label="bla"} blubb
+`,
+			err: "text format parsing error in line 1: expected float as value",
+		},
+		// 12:
+		{
+			in: `
+# HELP metric one
+# HELP metric two
+`,
+			err: "text format parsing error in line 3: second HELP line for metric name",
+		},
+		// 13:
+		{
+			in: `
+# TYPE metric counter
+# TYPE metric untyped
+`,
+			err: `text format parsing error in line 3: second TYPE line for metric name "metric", or TYPE reported after samples`,
+		},
+		// 14:
+		{
+			in: `
+metric 4.12
+# TYPE metric counter
+`,
+			err: `text format parsing error in line 3: second TYPE line for metric name "metric", or TYPE reported after samples`,
+		},
+		// 14:
+		{
+			in: `
+# TYPE metric bla
+`,
+			err: "text format parsing error in line 2: unknown metric type",
+		},
+		// 15:
+		{
+			in: `
+# TYPE met-ric
+`,
+			err: "text format parsing error in line 2: invalid metric name in comment",
+		},
+		// 16:
+		{
+			in:  `@invalidmetric{label="bla"} 3.14 2`,
+			err: "text format parsing error in line 1: invalid metric name",
+		},
+		// 17:
+		{
+			in:  `{label="bla"} 3.14 2`,
+			err: "text format parsing error in line 1: invalid metric name",
+		},
+		// 18:
+		{
+			in: `
+# TYPE metric histogram
+metric_bucket{le="bla"} 3.14
+`,
+			err: "text format parsing error in line 3: expected float as value for 'le' label",
+		},
+	}
+
+	for i, scenario := range scenarios {
+		_, err := parser.TextToMetricFamilies(strings.NewReader(scenario.in))
+		if err == nil {
+			t.Errorf("%d. expected error, got nil", i)
+			continue
+		}
+		if expected, got := scenario.err, err.Error(); strings.Index(got, expected) != 0 {
+			t.Errorf(
+				"%d. expected error starting with %q, got %q",
+				i, expected, got,
+			)
+		}
+	}
+
+}
+
+func TestTextParseError(t *testing.T) {
+	testTextParseError(t)
+}
+
+func BenchmarkParseError(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testTextParseError(b)
+	}
+}

gateway/vendor/github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg/README.txt

@@ -0,0 +1,67 @@
+PACKAGE
+
+package goautoneg
+import "bitbucket.org/ww/goautoneg"
+
+HTTP Content-Type Autonegotiation.
+
+The functions in this package implement the behaviour specified in
+http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
+
+Copyright (c) 2011, Open Knowledge Foundation Ltd.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+    Neither the name of the Open Knowledge Foundation Ltd. nor the
+    names of its contributors may be used to endorse or promote
+    products derived from this software without specific prior written
+    permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+FUNCTIONS
+
+func Negotiate(header string, alternatives []string) (content_type string)
+Negotiate the most appropriate content_type given the accept header
+and a list of alternatives.
+
+func ParseAccept(header string) (accept []Accept)
+Parse an Accept Header string returning a sorted list
+of clauses
+
+
+TYPES
+
+type Accept struct {
+    Type, SubType string
+    Q             float32
+    Params        map[string]string
+}
+Structure to represent a clause in an HTTP Accept Header
+
+
+SUBDIRECTORIES
+
+	.hg

gateway/vendor/github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg/autoneg.go

@@ -0,0 +1,162 @@
+/*
+HTTP Content-Type Autonegotiation.
+
+The functions in this package implement the behaviour specified in
+http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
+
+Copyright (c) 2011, Open Knowledge Foundation Ltd.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+    Neither the name of the Open Knowledge Foundation Ltd. nor the
+    names of its contributors may be used to endorse or promote
+    products derived from this software without specific prior written
+    permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+*/
+package goautoneg
+
+import (
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// Structure to represent a clause in an HTTP Accept Header
+type Accept struct {
+	Type, SubType string
+	Q             float64
+	Params        map[string]string
+}
+
+// For internal use, so that we can use the sort interface
+type accept_slice []Accept
+
+func (accept accept_slice) Len() int {
+	slice := []Accept(accept)
+	return len(slice)
+}
+
+func (accept accept_slice) Less(i, j int) bool {
+	slice := []Accept(accept)
+	ai, aj := slice[i], slice[j]
+	if ai.Q > aj.Q {
+		return true
+	}
+	if ai.Type != "*" && aj.Type == "*" {
+		return true
+	}
+	if ai.SubType != "*" && aj.SubType == "*" {
+		return true
+	}
+	return false
+}
+
+func (accept accept_slice) Swap(i, j int) {
+	slice := []Accept(accept)
+	slice[i], slice[j] = slice[j], slice[i]
+}
+
+// Parse an Accept Header string returning a sorted list
+// of clauses
+func ParseAccept(header string) (accept []Accept) {
+	parts := strings.Split(header, ",")
+	accept = make([]Accept, 0, len(parts))
+	for _, part := range parts {
+		part := strings.Trim(part, " ")
+
+		a := Accept{}
+		a.Params = make(map[string]string)
+		a.Q = 1.0
+
+		mrp := strings.Split(part, ";")
+
+		media_range := mrp[0]
+		sp := strings.Split(media_range, "/")
+		a.Type = strings.Trim(sp[0], " ")
+
+		switch {
+		case len(sp) == 1 && a.Type == "*":
+			a.SubType = "*"
+		case len(sp) == 2:
+			a.SubType = strings.Trim(sp[1], " ")
+		default:
+			continue
+		}
+
+		if len(mrp) == 1 {
+			accept = append(accept, a)
+			continue
+		}
+
+		for _, param := range mrp[1:] {
+			sp := strings.SplitN(param, "=", 2)
+			if len(sp) != 2 {
+				continue
+			}
+			token := strings.Trim(sp[0], " ")
+			if token == "q" {
+				a.Q, _ = strconv.ParseFloat(sp[1], 32)
+			} else {
+				a.Params[token] = strings.Trim(sp[1], " ")
+			}
+		}
+
+		accept = append(accept, a)
+	}
+
+	slice := accept_slice(accept)
+	sort.Sort(slice)
+
+	return
+}
+
+// Negotiate the most appropriate content_type given the accept header
+// and a list of alternatives.
+func Negotiate(header string, alternatives []string) (content_type string) {
+	asp := make([][]string, 0, len(alternatives))
+	for _, ctype := range alternatives {
+		asp = append(asp, strings.SplitN(ctype, "/", 2))
+	}
+	for _, clause := range ParseAccept(header) {
+		for i, ctsp := range asp {
+			if clause.Type == ctsp[0] && clause.SubType == ctsp[1] {
+				content_type = alternatives[i]
+				return
+			}
+			if clause.Type == ctsp[0] && clause.SubType == "*" {
+				content_type = alternatives[i]
+				return
+			}
+			if clause.Type == "*" && clause.SubType == "*" {
+				content_type = alternatives[i]
+				return
+			}
+		}
+	}
+	return
+}

gateway/vendor/github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg/autoneg_test.go

@@ -0,0 +1,33 @@
+package goautoneg
+
+import (
+	"testing"
+)
+
+var chrome = "application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"
+
+func TestParseAccept(t *testing.T) {
+	alternatives := []string{"text/html", "image/png"}
+	content_type := Negotiate(chrome, alternatives)
+	if content_type != "image/png" {
+		t.Errorf("got %s expected image/png", content_type)
+	}
+
+	alternatives = []string{"text/html", "text/plain", "text/n3"}
+	content_type = Negotiate(chrome, alternatives)
+	if content_type != "text/html" {
+		t.Errorf("got %s expected text/html", content_type)
+	}
+
+	alternatives = []string{"text/n3", "text/plain"}
+	content_type = Negotiate(chrome, alternatives)
+	if content_type != "text/plain" {
+		t.Errorf("got %s expected text/plain", content_type)
+	}
+
+	alternatives = []string{"text/n3", "application/rdf+xml"}
+	content_type = Negotiate(chrome, alternatives)
+	if content_type != "text/n3" {
+		t.Errorf("got %s expected text/n3", content_type)
+	}
+}

gateway/vendor/github.com/prometheus/common/log/eventlog_formatter.go

@@ -0,0 +1,89 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build windows
+
+package log
+
+import (
+	"fmt"
+	"os"
+
+	"golang.org/x/sys/windows/svc/eventlog"
+
+	"github.com/Sirupsen/logrus"
+)
+
+func init() {
+	setEventlogFormatter = func(name string, debugAsInfo bool) error {
+		if name == "" {
+			return fmt.Errorf("missing name parameter")
+		}
+
+		fmter, err := newEventlogger(name, debugAsInfo, origLogger.Formatter)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error creating eventlog formatter: %v\n", err)
+			origLogger.Errorf("can't connect logger to eventlog: %v", err)
+			return err
+		}
+		origLogger.Formatter = fmter
+		return nil
+	}
+}
+
+type eventlogger struct {
+	log         *eventlog.Log
+	debugAsInfo bool
+	wrap        logrus.Formatter
+}
+
+func newEventlogger(name string, debugAsInfo bool, fmter logrus.Formatter) (*eventlogger, error) {
+	logHandle, err := eventlog.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return &eventlogger{log: logHandle, debugAsInfo: debugAsInfo, wrap: fmter}, nil
+}
+
+func (s *eventlogger) Format(e *logrus.Entry) ([]byte, error) {
+	data, err := s.wrap.Format(e)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "eventlogger: can't format entry: %v\n", err)
+		return data, err
+	}
+
+	switch e.Level {
+	case logrus.PanicLevel:
+		fallthrough
+	case logrus.FatalLevel:
+		fallthrough
+	case logrus.ErrorLevel:
+		err = s.log.Error(102, e.Message)
+	case logrus.WarnLevel:
+		err = s.log.Warning(101, e.Message)
+	case logrus.InfoLevel:
+		err = s.log.Info(100, e.Message)
+	case logrus.DebugLevel:
+		if s.debugAsInfo {
+			err = s.log.Info(100, e.Message)
+		}
+	default:
+		err = s.log.Info(100, e.Message)
+	}
+
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "eventlogger: can't send log to eventlog: %v\n", err)
+	}
+
+	return data, err
+}

gateway/vendor/github.com/prometheus/common/log/log.go

@@ -0,0 +1,365 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package log
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/url"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+
+	"github.com/Sirupsen/logrus"
+)
+
+type levelFlag string
+
+// String implements flag.Value.
+func (f levelFlag) String() string {
+	return fmt.Sprintf("%q", string(f))
+}
+
+// Set implements flag.Value.
+func (f levelFlag) Set(level string) error {
+	l, err := logrus.ParseLevel(level)
+	if err != nil {
+		return err
+	}
+	origLogger.Level = l
+	return nil
+}
+
+// setSyslogFormatter is nil if the target architecture does not support syslog.
+var setSyslogFormatter func(string, string) error
+
+// setEventlogFormatter is nil if the target OS does not support Eventlog (i.e., is not Windows).
+var setEventlogFormatter func(string, bool) error
+
+func setJSONFormatter() {
+	origLogger.Formatter = &logrus.JSONFormatter{}
+}
+
+type logFormatFlag url.URL
+
+// String implements flag.Value.
+func (f logFormatFlag) String() string {
+	u := url.URL(f)
+	return fmt.Sprintf("%q", u.String())
+}
+
+// Set implements flag.Value.
+func (f logFormatFlag) Set(format string) error {
+	u, err := url.Parse(format)
+	if err != nil {
+		return err
+	}
+	if u.Scheme != "logger" {
+		return fmt.Errorf("invalid scheme %s", u.Scheme)
+	}
+	jsonq := u.Query().Get("json")
+	if jsonq == "true" {
+		setJSONFormatter()
+	}
+
+	switch u.Opaque {
+	case "syslog":
+		if setSyslogFormatter == nil {
+			return fmt.Errorf("system does not support syslog")
+		}
+		appname := u.Query().Get("appname")
+		facility := u.Query().Get("local")
+		return setSyslogFormatter(appname, facility)
+	case "eventlog":
+		if setEventlogFormatter == nil {
+			return fmt.Errorf("system does not support eventlog")
+		}
+		name := u.Query().Get("name")
+		debugAsInfo := false
+		debugAsInfoRaw := u.Query().Get("debugAsInfo")
+		if parsedDebugAsInfo, err := strconv.ParseBool(debugAsInfoRaw); err == nil {
+			debugAsInfo = parsedDebugAsInfo
+		}
+		return setEventlogFormatter(name, debugAsInfo)
+	case "stdout":
+		origLogger.Out = os.Stdout
+	case "stderr":
+		origLogger.Out = os.Stderr
+	default:
+		return fmt.Errorf("unsupported logger %q", u.Opaque)
+	}
+	return nil
+}
+
+func init() {
+	AddFlags(flag.CommandLine)
+}
+
+// AddFlags adds the flags used by this package to the given FlagSet. That's
+// useful if working with a custom FlagSet. The init function of this package
+// adds the flags to flag.CommandLine anyway. Thus, it's usually enough to call
+// flag.Parse() to make the logging flags take effect.
+func AddFlags(fs *flag.FlagSet) {
+	fs.Var(
+		levelFlag(origLogger.Level.String()),
+		"log.level",
+		"Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]",
+	)
+	fs.Var(
+		logFormatFlag(url.URL{Scheme: "logger", Opaque: "stderr"}),
+		"log.format",
+		`Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"`,
+	)
+}
+
+// Logger is the interface for loggers used in the Prometheus components.
+type Logger interface {
+	Debug(...interface{})
+	Debugln(...interface{})
+	Debugf(string, ...interface{})
+
+	Info(...interface{})
+	Infoln(...interface{})
+	Infof(string, ...interface{})
+
+	Warn(...interface{})
+	Warnln(...interface{})
+	Warnf(string, ...interface{})
+
+	Error(...interface{})
+	Errorln(...interface{})
+	Errorf(string, ...interface{})
+
+	Fatal(...interface{})
+	Fatalln(...interface{})
+	Fatalf(string, ...interface{})
+
+	With(key string, value interface{}) Logger
+}
+
+type logger struct {
+	entry *logrus.Entry
+}
+
+func (l logger) With(key string, value interface{}) Logger {
+	return logger{l.entry.WithField(key, value)}
+}
+
+// Debug logs a message at level Debug on the standard logger.
+func (l logger) Debug(args ...interface{}) {
+	l.sourced().Debug(args...)
+}
+
+// Debug logs a message at level Debug on the standard logger.
+func (l logger) Debugln(args ...interface{}) {
+	l.sourced().Debugln(args...)
+}
+
+// Debugf logs a message at level Debug on the standard logger.
+func (l logger) Debugf(format string, args ...interface{}) {
+	l.sourced().Debugf(format, args...)
+}
+
+// Info logs a message at level Info on the standard logger.
+func (l logger) Info(args ...interface{}) {
+	l.sourced().Info(args...)
+}
+
+// Info logs a message at level Info on the standard logger.
+func (l logger) Infoln(args ...interface{}) {
+	l.sourced().Infoln(args...)
+}
+
+// Infof logs a message at level Info on the standard logger.
+func (l logger) Infof(format string, args ...interface{}) {
+	l.sourced().Infof(format, args...)
+}
+
+// Warn logs a message at level Warn on the standard logger.
+func (l logger) Warn(args ...interface{}) {
+	l.sourced().Warn(args...)
+}
+
+// Warn logs a message at level Warn on the standard logger.
+func (l logger) Warnln(args ...interface{}) {
+	l.sourced().Warnln(args...)
+}
+
+// Warnf logs a message at level Warn on the standard logger.
+func (l logger) Warnf(format string, args ...interface{}) {
+	l.sourced().Warnf(format, args...)
+}
+
+// Error logs a message at level Error on the standard logger.
+func (l logger) Error(args ...interface{}) {
+	l.sourced().Error(args...)
+}
+
+// Error logs a message at level Error on the standard logger.
+func (l logger) Errorln(args ...interface{}) {
+	l.sourced().Errorln(args...)
+}
+
+// Errorf logs a message at level Error on the standard logger.
+func (l logger) Errorf(format string, args ...interface{}) {
+	l.sourced().Errorf(format, args...)
+}
+
+// Fatal logs a message at level Fatal on the standard logger.
+func (l logger) Fatal(args ...interface{}) {
+	l.sourced().Fatal(args...)
+}
+
+// Fatal logs a message at level Fatal on the standard logger.
+func (l logger) Fatalln(args ...interface{}) {
+	l.sourced().Fatalln(args...)
+}
+
+// Fatalf logs a message at level Fatal on the standard logger.
+func (l logger) Fatalf(format string, args ...interface{}) {
+	l.sourced().Fatalf(format, args...)
+}
+
+// sourced adds a source field to the logger that contains
+// the file name and line where the logging happened.
+func (l logger) sourced() *logrus.Entry {
+	_, file, line, ok := runtime.Caller(2)
+	if !ok {
+		file = "<???>"
+		line = 1
+	} else {
+		slash := strings.LastIndex(file, "/")
+		file = file[slash+1:]
+	}
+	return l.entry.WithField("source", fmt.Sprintf("%s:%d", file, line))
+}
+
+var origLogger = logrus.New()
+var baseLogger = logger{entry: logrus.NewEntry(origLogger)}
+
+// Base returns the default Logger logging to
+func Base() Logger {
+	return baseLogger
+}
+
+// NewLogger returns a new Logger logging to out.
+func NewLogger(w io.Writer) Logger {
+	l := logrus.New()
+	l.Out = w
+	return logger{entry: logrus.NewEntry(l)}
+}
+
+// NewNopLogger returns a logger that discards all log messages.
+func NewNopLogger() Logger {
+	l := logrus.New()
+	l.Out = ioutil.Discard
+	return logger{entry: logrus.NewEntry(l)}
+}
+
+// With adds a field to the logger.
+func With(key string, value interface{}) Logger {
+	return baseLogger.With(key, value)
+}
+
+// Debug logs a message at level Debug on the standard logger.
+func Debug(args ...interface{}) {
+	baseLogger.sourced().Debug(args...)
+}
+
+// Debugln logs a message at level Debug on the standard logger.
+func Debugln(args ...interface{}) {
+	baseLogger.sourced().Debugln(args...)
+}
+
+// Debugf logs a message at level Debug on the standard logger.
+func Debugf(format string, args ...interface{}) {
+	baseLogger.sourced().Debugf(format, args...)
+}
+
+// Info logs a message at level Info on the standard logger.
+func Info(args ...interface{}) {
+	baseLogger.sourced().Info(args...)
+}
+
+// Infoln logs a message at level Info on the standard logger.
+func Infoln(args ...interface{}) {
+	baseLogger.sourced().Infoln(args...)
+}
+
+// Infof logs a message at level Info on the standard logger.
+func Infof(format string, args ...interface{}) {
+	baseLogger.sourced().Infof(format, args...)
+}
+
+// Warn logs a message at level Warn on the standard logger.
+func Warn(args ...interface{}) {
+	baseLogger.sourced().Warn(args...)
+}
+
+// Warnln logs a message at level Warn on the standard logger.
+func Warnln(args ...interface{}) {
+	baseLogger.sourced().Warnln(args...)
+}
+
+// Warnf logs a message at level Warn on the standard logger.
+func Warnf(format string, args ...interface{}) {
+	baseLogger.sourced().Warnf(format, args...)
+}
+
+// Error logs a message at level Error on the standard logger.
+func Error(args ...interface{}) {
+	baseLogger.sourced().Error(args...)
+}
+
+// Errorln logs a message at level Error on the standard logger.
+func Errorln(args ...interface{}) {
+	baseLogger.sourced().Errorln(args...)
+}
+
+// Errorf logs a message at level Error on the standard logger.
+func Errorf(format string, args ...interface{}) {
+	baseLogger.sourced().Errorf(format, args...)
+}
+
+// Fatal logs a message at level Fatal on the standard logger.
+func Fatal(args ...interface{}) {
+	baseLogger.sourced().Fatal(args...)
+}
+
+// Fatalln logs a message at level Fatal on the standard logger.
+func Fatalln(args ...interface{}) {
+	baseLogger.sourced().Fatalln(args...)
+}
+
+// Fatalf logs a message at level Fatal on the standard logger.
+func Fatalf(format string, args ...interface{}) {
+	baseLogger.sourced().Fatalf(format, args...)
+}
+
+type errorLogWriter struct{}
+
+func (errorLogWriter) Write(b []byte) (int, error) {
+	baseLogger.sourced().Error(string(b))
+	return len(b), nil
+}
+
+// NewErrorLogger returns a log.Logger that is meant to be used
+// in the ErrorLog field of an http.Server to log HTTP server errors.
+func NewErrorLogger() *log.Logger {
+	return log.New(&errorLogWriter{}, "", 0)
+}

gateway/vendor/github.com/prometheus/common/log/log_test.go

@@ -0,0 +1,39 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package log
+
+import (
+	"bytes"
+	"regexp"
+	"testing"
+
+	"github.com/Sirupsen/logrus"
+)
+
+func TestFileLineLogging(t *testing.T) {
+	var buf bytes.Buffer
+	origLogger.Out = &buf
+	origLogger.Formatter = &logrus.TextFormatter{
+		DisableColors: true,
+	}
+
+	// The default logging level should be "info".
+	Debug("This debug-level line should not show up in the output.")
+	Infof("This %s-level line should show up in the output.", "info")
+
+	re := `^time=".*" level=info msg="This info-level line should show up in the output." source="log_test.go:33" \n$`
+	if !regexp.MustCompile(re).Match(buf.Bytes()) {
+		t.Fatalf("%q did not match expected regex %q", buf.String(), re)
+	}
+}

gateway/vendor/github.com/prometheus/common/log/syslog_formatter.go

@@ -0,0 +1,126 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !windows,!nacl,!plan9
+
+package log
+
+import (
+	"fmt"
+	"log/syslog"
+	"os"
+
+	"github.com/Sirupsen/logrus"
+)
+
+var _ logrus.Formatter = (*syslogger)(nil)
+
+func init() {
+	setSyslogFormatter = func(appname, local string) error {
+		if appname == "" {
+			return fmt.Errorf("missing appname parameter")
+		}
+		if local == "" {
+			return fmt.Errorf("missing local parameter")
+		}
+
+		fmter, err := newSyslogger(appname, local, origLogger.Formatter)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error creating syslog formatter: %v\n", err)
+			origLogger.Errorf("can't connect logger to syslog: %v", err)
+			return err
+		}
+		origLogger.Formatter = fmter
+		return nil
+	}
+}
+
+var prefixTag []byte
+
+type syslogger struct {
+	wrap logrus.Formatter
+	out  *syslog.Writer
+}
+
+func newSyslogger(appname string, facility string, fmter logrus.Formatter) (*syslogger, error) {
+	priority, err := getFacility(facility)
+	if err != nil {
+		return nil, err
+	}
+	out, err := syslog.New(priority, appname)
+	_, isJSON := fmter.(*logrus.JSONFormatter)
+	if isJSON {
+		// add cee tag to json formatted syslogs
+		prefixTag = []byte("@cee:")
+	}
+	return &syslogger{
+		out:  out,
+		wrap: fmter,
+	}, err
+}
+
+func getFacility(facility string) (syslog.Priority, error) {
+	switch facility {
+	case "0":
+		return syslog.LOG_LOCAL0, nil
+	case "1":
+		return syslog.LOG_LOCAL1, nil
+	case "2":
+		return syslog.LOG_LOCAL2, nil
+	case "3":
+		return syslog.LOG_LOCAL3, nil
+	case "4":
+		return syslog.LOG_LOCAL4, nil
+	case "5":
+		return syslog.LOG_LOCAL5, nil
+	case "6":
+		return syslog.LOG_LOCAL6, nil
+	case "7":
+		return syslog.LOG_LOCAL7, nil
+	}
+	return syslog.LOG_LOCAL0, fmt.Errorf("invalid local(%s) for syslog", facility)
+}
+
+func (s *syslogger) Format(e *logrus.Entry) ([]byte, error) {
+	data, err := s.wrap.Format(e)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "syslogger: can't format entry: %v\n", err)
+		return data, err
+	}
+	// only append tag to data sent to syslog (line), not to what
+	// is returned
+	line := string(append(prefixTag, data...))
+
+	switch e.Level {
+	case logrus.PanicLevel:
+		err = s.out.Crit(line)
+	case logrus.FatalLevel:
+		err = s.out.Crit(line)
+	case logrus.ErrorLevel:
+		err = s.out.Err(line)
+	case logrus.WarnLevel:
+		err = s.out.Warning(line)
+	case logrus.InfoLevel:
+		err = s.out.Info(line)
+	case logrus.DebugLevel:
+		err = s.out.Debug(line)
+	default:
+		err = s.out.Notice(line)
+	}
+
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "syslogger: can't send log to syslog: %v\n", err)
+	}
+
+	return data, err
+}

gateway/vendor/github.com/prometheus/common/log/syslog_formatter_test.go

@@ -0,0 +1,52 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !windows,!nacl,!plan9
+
+package log
+
+import (
+	"errors"
+	"log/syslog"
+	"testing"
+)
+
+func TestGetFacility(t *testing.T) {
+	testCases := []struct {
+		facility         string
+		expectedPriority syslog.Priority
+		expectedErr      error
+	}{
+		{"0", syslog.LOG_LOCAL0, nil},
+		{"1", syslog.LOG_LOCAL1, nil},
+		{"2", syslog.LOG_LOCAL2, nil},
+		{"3", syslog.LOG_LOCAL3, nil},
+		{"4", syslog.LOG_LOCAL4, nil},
+		{"5", syslog.LOG_LOCAL5, nil},
+		{"6", syslog.LOG_LOCAL6, nil},
+		{"7", syslog.LOG_LOCAL7, nil},
+		{"8", syslog.LOG_LOCAL0, errors.New("invalid local(8) for syslog")},
+	}
+	for _, tc := range testCases {
+		priority, err := getFacility(tc.facility)
+		if err != tc.expectedErr {
+			if err.Error() != tc.expectedErr.Error() {
+				t.Errorf("want %s, got %s", tc.expectedErr.Error(), err.Error())
+			}
+		}
+
+		if priority != tc.expectedPriority {
+			t.Errorf("want %q, got %q", tc.expectedPriority, priority)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/alert.go

@@ -0,0 +1,136 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"fmt"
+	"time"
+)
+
+type AlertStatus string
+
+const (
+	AlertFiring   AlertStatus = "firing"
+	AlertResolved AlertStatus = "resolved"
+)
+
+// Alert is a generic representation of an alert in the Prometheus eco-system.
+type Alert struct {
+	// Label value pairs for purpose of aggregation, matching, and disposition
+	// dispatching. This must minimally include an "alertname" label.
+	Labels LabelSet `json:"labels"`
+
+	// Extra key/value information which does not define alert identity.
+	Annotations LabelSet `json:"annotations"`
+
+	// The known time range for this alert. Both ends are optional.
+	StartsAt     time.Time `json:"startsAt,omitempty"`
+	EndsAt       time.Time `json:"endsAt,omitempty"`
+	GeneratorURL string    `json:"generatorURL"`
+}
+
+// Name returns the name of the alert. It is equivalent to the "alertname" label.
+func (a *Alert) Name() string {
+	return string(a.Labels[AlertNameLabel])
+}
+
+// Fingerprint returns a unique hash for the alert. It is equivalent to
+// the fingerprint of the alert's label set.
+func (a *Alert) Fingerprint() Fingerprint {
+	return a.Labels.Fingerprint()
+}
+
+func (a *Alert) String() string {
+	s := fmt.Sprintf("%s[%s]", a.Name(), a.Fingerprint().String()[:7])
+	if a.Resolved() {
+		return s + "[resolved]"
+	}
+	return s + "[active]"
+}
+
+// Resolved returns true iff the activity interval ended in the past.
+func (a *Alert) Resolved() bool {
+	return a.ResolvedAt(time.Now())
+}
+
+// ResolvedAt returns true off the activity interval ended before
+// the given timestamp.
+func (a *Alert) ResolvedAt(ts time.Time) bool {
+	if a.EndsAt.IsZero() {
+		return false
+	}
+	return !a.EndsAt.After(ts)
+}
+
+// Status returns the status of the alert.
+func (a *Alert) Status() AlertStatus {
+	if a.Resolved() {
+		return AlertResolved
+	}
+	return AlertFiring
+}
+
+// Validate checks whether the alert data is inconsistent.
+func (a *Alert) Validate() error {
+	if a.StartsAt.IsZero() {
+		return fmt.Errorf("start time missing")
+	}
+	if !a.EndsAt.IsZero() && a.EndsAt.Before(a.StartsAt) {
+		return fmt.Errorf("start time must be before end time")
+	}
+	if err := a.Labels.Validate(); err != nil {
+		return fmt.Errorf("invalid label set: %s", err)
+	}
+	if len(a.Labels) == 0 {
+		return fmt.Errorf("at least one label pair required")
+	}
+	if err := a.Annotations.Validate(); err != nil {
+		return fmt.Errorf("invalid annotations: %s", err)
+	}
+	return nil
+}
+
+// Alert is a list of alerts that can be sorted in chronological order.
+type Alerts []*Alert
+
+func (as Alerts) Len() int      { return len(as) }
+func (as Alerts) Swap(i, j int) { as[i], as[j] = as[j], as[i] }
+
+func (as Alerts) Less(i, j int) bool {
+	if as[i].StartsAt.Before(as[j].StartsAt) {
+		return true
+	}
+	if as[i].EndsAt.Before(as[j].EndsAt) {
+		return true
+	}
+	return as[i].Fingerprint() < as[j].Fingerprint()
+}
+
+// HasFiring returns true iff one of the alerts is not resolved.
+func (as Alerts) HasFiring() bool {
+	for _, a := range as {
+		if !a.Resolved() {
+			return true
+		}
+	}
+	return false
+}
+
+// Status returns StatusFiring iff at least one of the alerts is firing.
+func (as Alerts) Status() AlertStatus {
+	if as.HasFiring() {
+		return AlertFiring
+	}
+	return AlertResolved
+}

gateway/vendor/github.com/prometheus/common/model/alert_test.go

@@ -0,0 +1,118 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestAlertValidate(t *testing.T) {
+	ts := time.Now()
+
+	var cases = []struct {
+		alert *Alert
+		err   string
+	}{
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b"},
+				StartsAt: ts,
+			},
+		},
+		{
+			alert: &Alert{
+				Labels: LabelSet{"a": "b"},
+			},
+			err: "start time missing",
+		},
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b"},
+				StartsAt: ts,
+				EndsAt:   ts,
+			},
+		},
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b"},
+				StartsAt: ts,
+				EndsAt:   ts.Add(1 * time.Minute),
+			},
+		},
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b"},
+				StartsAt: ts,
+				EndsAt:   ts.Add(-1 * time.Minute),
+			},
+			err: "start time must be before end time",
+		},
+		{
+			alert: &Alert{
+				StartsAt: ts,
+			},
+			err: "at least one label pair required",
+		},
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b", "!bad": "label"},
+				StartsAt: ts,
+			},
+			err: "invalid label set: invalid name",
+		},
+		{
+			alert: &Alert{
+				Labels:   LabelSet{"a": "b", "bad": "\xfflabel"},
+				StartsAt: ts,
+			},
+			err: "invalid label set: invalid value",
+		},
+		{
+			alert: &Alert{
+				Labels:      LabelSet{"a": "b"},
+				Annotations: LabelSet{"!bad": "label"},
+				StartsAt:    ts,
+			},
+			err: "invalid annotations: invalid name",
+		},
+		{
+			alert: &Alert{
+				Labels:      LabelSet{"a": "b"},
+				Annotations: LabelSet{"bad": "\xfflabel"},
+				StartsAt:    ts,
+			},
+			err: "invalid annotations: invalid value",
+		},
+	}
+
+	for i, c := range cases {
+		err := c.alert.Validate()
+		if err == nil {
+			if c.err == "" {
+				continue
+			}
+			t.Errorf("%d. Expected error %q but got none", i, c.err)
+			continue
+		}
+		if c.err == "" && err != nil {
+			t.Errorf("%d. Expected no error but got %q", i, err)
+			continue
+		}
+		if !strings.Contains(err.Error(), c.err) {
+			t.Errorf("%d. Expected error to contain %q but got %q", i, c.err, err)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/fingerprinting.go

@@ -0,0 +1,105 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"fmt"
+	"strconv"
+)
+
+// Fingerprint provides a hash-capable representation of a Metric.
+// For our purposes, FNV-1A 64-bit is used.
+type Fingerprint uint64
+
+// FingerprintFromString transforms a string representation into a Fingerprint.
+func FingerprintFromString(s string) (Fingerprint, error) {
+	num, err := strconv.ParseUint(s, 16, 64)
+	return Fingerprint(num), err
+}
+
+// ParseFingerprint parses the input string into a fingerprint.
+func ParseFingerprint(s string) (Fingerprint, error) {
+	num, err := strconv.ParseUint(s, 16, 64)
+	if err != nil {
+		return 0, err
+	}
+	return Fingerprint(num), nil
+}
+
+func (f Fingerprint) String() string {
+	return fmt.Sprintf("%016x", uint64(f))
+}
+
+// Fingerprints represents a collection of Fingerprint subject to a given
+// natural sorting scheme. It implements sort.Interface.
+type Fingerprints []Fingerprint
+
+// Len implements sort.Interface.
+func (f Fingerprints) Len() int {
+	return len(f)
+}
+
+// Less implements sort.Interface.
+func (f Fingerprints) Less(i, j int) bool {
+	return f[i] < f[j]
+}
+
+// Swap implements sort.Interface.
+func (f Fingerprints) Swap(i, j int) {
+	f[i], f[j] = f[j], f[i]
+}
+
+// FingerprintSet is a set of Fingerprints.
+type FingerprintSet map[Fingerprint]struct{}
+
+// Equal returns true if both sets contain the same elements (and not more).
+func (s FingerprintSet) Equal(o FingerprintSet) bool {
+	if len(s) != len(o) {
+		return false
+	}
+
+	for k := range s {
+		if _, ok := o[k]; !ok {
+			return false
+		}
+	}
+
+	return true
+}
+
+// Intersection returns the elements contained in both sets.
+func (s FingerprintSet) Intersection(o FingerprintSet) FingerprintSet {
+	myLength, otherLength := len(s), len(o)
+	if myLength == 0 || otherLength == 0 {
+		return FingerprintSet{}
+	}
+
+	subSet := s
+	superSet := o
+
+	if otherLength < myLength {
+		subSet = o
+		superSet = s
+	}
+
+	out := FingerprintSet{}
+
+	for k := range subSet {
+		if _, ok := superSet[k]; ok {
+			out[k] = struct{}{}
+		}
+	}
+
+	return out
+}

gateway/vendor/github.com/prometheus/common/model/fnv.go

@@ -0,0 +1,42 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+// Inline and byte-free variant of hash/fnv's fnv64a.
+
+const (
+	offset64 = 14695981039346656037
+	prime64  = 1099511628211
+)
+
+// hashNew initializies a new fnv64a hash value.
+func hashNew() uint64 {
+	return offset64
+}
+
+// hashAdd adds a string to a fnv64a hash value, returning the updated hash.
+func hashAdd(h uint64, s string) uint64 {
+	for i := 0; i < len(s); i++ {
+		h ^= uint64(s[i])
+		h *= prime64
+	}
+	return h
+}
+
+// hashAddByte adds a byte to a fnv64a hash value, returning the updated hash.
+func hashAddByte(h uint64, b byte) uint64 {
+	h ^= uint64(b)
+	h *= prime64
+	return h
+}

gateway/vendor/github.com/prometheus/common/model/labels.go

@@ -0,0 +1,210 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"strings"
+	"unicode/utf8"
+)
+
+const (
+	// AlertNameLabel is the name of the label containing the an alert's name.
+	AlertNameLabel = "alertname"
+
+	// ExportedLabelPrefix is the prefix to prepend to the label names present in
+	// exported metrics if a label of the same name is added by the server.
+	ExportedLabelPrefix = "exported_"
+
+	// MetricNameLabel is the label name indicating the metric name of a
+	// timeseries.
+	MetricNameLabel = "__name__"
+
+	// SchemeLabel is the name of the label that holds the scheme on which to
+	// scrape a target.
+	SchemeLabel = "__scheme__"
+
+	// AddressLabel is the name of the label that holds the address of
+	// a scrape target.
+	AddressLabel = "__address__"
+
+	// MetricsPathLabel is the name of the label that holds the path on which to
+	// scrape a target.
+	MetricsPathLabel = "__metrics_path__"
+
+	// ReservedLabelPrefix is a prefix which is not legal in user-supplied
+	// label names.
+	ReservedLabelPrefix = "__"
+
+	// MetaLabelPrefix is a prefix for labels that provide meta information.
+	// Labels with this prefix are used for intermediate label processing and
+	// will not be attached to time series.
+	MetaLabelPrefix = "__meta_"
+
+	// TmpLabelPrefix is a prefix for temporary labels as part of relabelling.
+	// Labels with this prefix are used for intermediate label processing and
+	// will not be attached to time series. This is reserved for use in
+	// Prometheus configuration files by users.
+	TmpLabelPrefix = "__tmp_"
+
+	// ParamLabelPrefix is a prefix for labels that provide URL parameters
+	// used to scrape a target.
+	ParamLabelPrefix = "__param_"
+
+	// JobLabel is the label name indicating the job from which a timeseries
+	// was scraped.
+	JobLabel = "job"
+
+	// InstanceLabel is the label name used for the instance label.
+	InstanceLabel = "instance"
+
+	// BucketLabel is used for the label that defines the upper bound of a
+	// bucket of a histogram ("le" -> "less or equal").
+	BucketLabel = "le"
+
+	// QuantileLabel is used for the label that defines the quantile in a
+	// summary.
+	QuantileLabel = "quantile"
+)
+
+// LabelNameRE is a regular expression matching valid label names. Note that the
+// IsValid method of LabelName performs the same check but faster than a match
+// with this regular expression.
+var LabelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")
+
+// A LabelName is a key for a LabelSet or Metric.  It has a value associated
+// therewith.
+type LabelName string
+
+// IsValid is true iff the label name matches the pattern of LabelNameRE. This
+// method, however, does not use LabelNameRE for the check but a much faster
+// hardcoded implementation.
+func (ln LabelName) IsValid() bool {
+	if len(ln) == 0 {
+		return false
+	}
+	for i, b := range ln {
+		if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0)) {
+			return false
+		}
+	}
+	return true
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (ln *LabelName) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+	if !LabelName(s).IsValid() {
+		return fmt.Errorf("%q is not a valid label name", s)
+	}
+	*ln = LabelName(s)
+	return nil
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (ln *LabelName) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	if !LabelName(s).IsValid() {
+		return fmt.Errorf("%q is not a valid label name", s)
+	}
+	*ln = LabelName(s)
+	return nil
+}
+
+// LabelNames is a sortable LabelName slice. In implements sort.Interface.
+type LabelNames []LabelName
+
+func (l LabelNames) Len() int {
+	return len(l)
+}
+
+func (l LabelNames) Less(i, j int) bool {
+	return l[i] < l[j]
+}
+
+func (l LabelNames) Swap(i, j int) {
+	l[i], l[j] = l[j], l[i]
+}
+
+func (l LabelNames) String() string {
+	labelStrings := make([]string, 0, len(l))
+	for _, label := range l {
+		labelStrings = append(labelStrings, string(label))
+	}
+	return strings.Join(labelStrings, ", ")
+}
+
+// A LabelValue is an associated value for a LabelName.
+type LabelValue string
+
+// IsValid returns true iff the string is a valid UTF8.
+func (lv LabelValue) IsValid() bool {
+	return utf8.ValidString(string(lv))
+}
+
+// LabelValues is a sortable LabelValue slice. It implements sort.Interface.
+type LabelValues []LabelValue
+
+func (l LabelValues) Len() int {
+	return len(l)
+}
+
+func (l LabelValues) Less(i, j int) bool {
+	return string(l[i]) < string(l[j])
+}
+
+func (l LabelValues) Swap(i, j int) {
+	l[i], l[j] = l[j], l[i]
+}
+
+// LabelPair pairs a name with a value.
+type LabelPair struct {
+	Name  LabelName
+	Value LabelValue
+}
+
+// LabelPairs is a sortable slice of LabelPair pointers. It implements
+// sort.Interface.
+type LabelPairs []*LabelPair
+
+func (l LabelPairs) Len() int {
+	return len(l)
+}
+
+func (l LabelPairs) Less(i, j int) bool {
+	switch {
+	case l[i].Name > l[j].Name:
+		return false
+	case l[i].Name < l[j].Name:
+		return true
+	case l[i].Value > l[j].Value:
+		return false
+	case l[i].Value < l[j].Value:
+		return true
+	default:
+		return false
+	}
+}
+
+func (l LabelPairs) Swap(i, j int) {
+	l[i], l[j] = l[j], l[i]
+}

gateway/vendor/github.com/prometheus/common/model/labels_test.go

@@ -0,0 +1,140 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"sort"
+	"testing"
+)
+
+func testLabelNames(t testing.TB) {
+	var scenarios = []struct {
+		in  LabelNames
+		out LabelNames
+	}{
+		{
+			in:  LabelNames{"ZZZ", "zzz"},
+			out: LabelNames{"ZZZ", "zzz"},
+		},
+		{
+			in:  LabelNames{"aaa", "AAA"},
+			out: LabelNames{"AAA", "aaa"},
+		},
+	}
+
+	for i, scenario := range scenarios {
+		sort.Sort(scenario.in)
+
+		for j, expected := range scenario.out {
+			if expected != scenario.in[j] {
+				t.Errorf("%d.%d expected %s, got %s", i, j, expected, scenario.in[j])
+			}
+		}
+	}
+}
+
+func TestLabelNames(t *testing.T) {
+	testLabelNames(t)
+}
+
+func BenchmarkLabelNames(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testLabelNames(b)
+	}
+}
+
+func testLabelValues(t testing.TB) {
+	var scenarios = []struct {
+		in  LabelValues
+		out LabelValues
+	}{
+		{
+			in:  LabelValues{"ZZZ", "zzz"},
+			out: LabelValues{"ZZZ", "zzz"},
+		},
+		{
+			in:  LabelValues{"aaa", "AAA"},
+			out: LabelValues{"AAA", "aaa"},
+		},
+	}
+
+	for i, scenario := range scenarios {
+		sort.Sort(scenario.in)
+
+		for j, expected := range scenario.out {
+			if expected != scenario.in[j] {
+				t.Errorf("%d.%d expected %s, got %s", i, j, expected, scenario.in[j])
+			}
+		}
+	}
+}
+
+func TestLabelValues(t *testing.T) {
+	testLabelValues(t)
+}
+
+func BenchmarkLabelValues(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testLabelValues(b)
+	}
+}
+
+func TestLabelNameIsValid(t *testing.T) {
+	var scenarios = []struct {
+		ln    LabelName
+		valid bool
+	}{
+		{
+			ln:    "Avalid_23name",
+			valid: true,
+		},
+		{
+			ln:    "_Avalid_23name",
+			valid: true,
+		},
+		{
+			ln:    "1valid_23name",
+			valid: false,
+		},
+		{
+			ln:    "avalid_23name",
+			valid: true,
+		},
+		{
+			ln:    "Ava:lid_23name",
+			valid: false,
+		},
+		{
+			ln:    "a lid_23name",
+			valid: false,
+		},
+		{
+			ln:    ":leading_colon",
+			valid: false,
+		},
+		{
+			ln:    "colon:in:the:middle",
+			valid: false,
+		},
+	}
+
+	for _, s := range scenarios {
+		if s.ln.IsValid() != s.valid {
+			t.Errorf("Expected %v for %q using IsValid method", s.valid, s.ln)
+		}
+		if LabelNameRE.MatchString(string(s.ln)) != s.valid {
+			t.Errorf("Expected %v for %q using regexp match", s.valid, s.ln)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/labelset.go

@@ -0,0 +1,169 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// A LabelSet is a collection of LabelName and LabelValue pairs.  The LabelSet
+// may be fully-qualified down to the point where it may resolve to a single
+// Metric in the data store or not.  All operations that occur within the realm
+// of a LabelSet can emit a vector of Metric entities to which the LabelSet may
+// match.
+type LabelSet map[LabelName]LabelValue
+
+// Validate checks whether all names and values in the label set
+// are valid.
+func (ls LabelSet) Validate() error {
+	for ln, lv := range ls {
+		if !ln.IsValid() {
+			return fmt.Errorf("invalid name %q", ln)
+		}
+		if !lv.IsValid() {
+			return fmt.Errorf("invalid value %q", lv)
+		}
+	}
+	return nil
+}
+
+// Equal returns true iff both label sets have exactly the same key/value pairs.
+func (ls LabelSet) Equal(o LabelSet) bool {
+	if len(ls) != len(o) {
+		return false
+	}
+	for ln, lv := range ls {
+		olv, ok := o[ln]
+		if !ok {
+			return false
+		}
+		if olv != lv {
+			return false
+		}
+	}
+	return true
+}
+
+// Before compares the metrics, using the following criteria:
+//
+// If m has fewer labels than o, it is before o. If it has more, it is not.
+//
+// If the number of labels is the same, the superset of all label names is
+// sorted alphanumerically. The first differing label pair found in that order
+// determines the outcome: If the label does not exist at all in m, then m is
+// before o, and vice versa. Otherwise the label value is compared
+// alphanumerically.
+//
+// If m and o are equal, the method returns false.
+func (ls LabelSet) Before(o LabelSet) bool {
+	if len(ls) < len(o) {
+		return true
+	}
+	if len(ls) > len(o) {
+		return false
+	}
+
+	lns := make(LabelNames, 0, len(ls)+len(o))
+	for ln := range ls {
+		lns = append(lns, ln)
+	}
+	for ln := range o {
+		lns = append(lns, ln)
+	}
+	// It's probably not worth it to de-dup lns.
+	sort.Sort(lns)
+	for _, ln := range lns {
+		mlv, ok := ls[ln]
+		if !ok {
+			return true
+		}
+		olv, ok := o[ln]
+		if !ok {
+			return false
+		}
+		if mlv < olv {
+			return true
+		}
+		if mlv > olv {
+			return false
+		}
+	}
+	return false
+}
+
+// Clone returns a copy of the label set.
+func (ls LabelSet) Clone() LabelSet {
+	lsn := make(LabelSet, len(ls))
+	for ln, lv := range ls {
+		lsn[ln] = lv
+	}
+	return lsn
+}
+
+// Merge is a helper function to non-destructively merge two label sets.
+func (l LabelSet) Merge(other LabelSet) LabelSet {
+	result := make(LabelSet, len(l))
+
+	for k, v := range l {
+		result[k] = v
+	}
+
+	for k, v := range other {
+		result[k] = v
+	}
+
+	return result
+}
+
+func (l LabelSet) String() string {
+	lstrs := make([]string, 0, len(l))
+	for l, v := range l {
+		lstrs = append(lstrs, fmt.Sprintf("%s=%q", l, v))
+	}
+
+	sort.Strings(lstrs)
+	return fmt.Sprintf("{%s}", strings.Join(lstrs, ", "))
+}
+
+// Fingerprint returns the LabelSet's fingerprint.
+func (ls LabelSet) Fingerprint() Fingerprint {
+	return labelSetToFingerprint(ls)
+}
+
+// FastFingerprint returns the LabelSet's Fingerprint calculated by a faster hashing
+// algorithm, which is, however, more susceptible to hash collisions.
+func (ls LabelSet) FastFingerprint() Fingerprint {
+	return labelSetToFastFingerprint(ls)
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (l *LabelSet) UnmarshalJSON(b []byte) error {
+	var m map[LabelName]LabelValue
+	if err := json.Unmarshal(b, &m); err != nil {
+		return err
+	}
+	// encoding/json only unmarshals maps of the form map[string]T. It treats
+	// LabelName as a string and does not call its UnmarshalJSON method.
+	// Thus, we have to replicate the behavior here.
+	for ln := range m {
+		if !ln.IsValid() {
+			return fmt.Errorf("%q is not a valid label name", ln)
+		}
+	}
+	*l = LabelSet(m)
+	return nil
+}

gateway/vendor/github.com/prometheus/common/model/metric.go

@@ -0,0 +1,103 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"fmt"
+	"regexp"
+	"sort"
+	"strings"
+)
+
+var (
+	separator = []byte{0}
+	// MetricNameRE is a regular expression matching valid metric
+	// names. Note that the IsValidMetricName function performs the same
+	// check but faster than a match with this regular expression.
+	MetricNameRE = regexp.MustCompile(`^[a-zA-Z_:][a-zA-Z0-9_:]*$`)
+)
+
+// A Metric is similar to a LabelSet, but the key difference is that a Metric is
+// a singleton and refers to one and only one stream of samples.
+type Metric LabelSet
+
+// Equal compares the metrics.
+func (m Metric) Equal(o Metric) bool {
+	return LabelSet(m).Equal(LabelSet(o))
+}
+
+// Before compares the metrics' underlying label sets.
+func (m Metric) Before(o Metric) bool {
+	return LabelSet(m).Before(LabelSet(o))
+}
+
+// Clone returns a copy of the Metric.
+func (m Metric) Clone() Metric {
+	clone := make(Metric, len(m))
+	for k, v := range m {
+		clone[k] = v
+	}
+	return clone
+}
+
+func (m Metric) String() string {
+	metricName, hasName := m[MetricNameLabel]
+	numLabels := len(m) - 1
+	if !hasName {
+		numLabels = len(m)
+	}
+	labelStrings := make([]string, 0, numLabels)
+	for label, value := range m {
+		if label != MetricNameLabel {
+			labelStrings = append(labelStrings, fmt.Sprintf("%s=%q", label, value))
+		}
+	}
+
+	switch numLabels {
+	case 0:
+		if hasName {
+			return string(metricName)
+		}
+		return "{}"
+	default:
+		sort.Strings(labelStrings)
+		return fmt.Sprintf("%s{%s}", metricName, strings.Join(labelStrings, ", "))
+	}
+}
+
+// Fingerprint returns a Metric's Fingerprint.
+func (m Metric) Fingerprint() Fingerprint {
+	return LabelSet(m).Fingerprint()
+}
+
+// FastFingerprint returns a Metric's Fingerprint calculated by a faster hashing
+// algorithm, which is, however, more susceptible to hash collisions.
+func (m Metric) FastFingerprint() Fingerprint {
+	return LabelSet(m).FastFingerprint()
+}
+
+// IsValidMetricName returns true iff name matches the pattern of MetricNameRE.
+// This function, however, does not use MetricNameRE for the check but a much
+// faster hardcoded implementation.
+func IsValidMetricName(n LabelValue) bool {
+	if len(n) == 0 {
+		return false
+	}
+	for i, b := range n {
+		if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || b == ':' || (b >= '0' && b <= '9' && i > 0)) {
+			return false
+		}
+	}
+	return true
+}

gateway/vendor/github.com/prometheus/common/model/metric_test.go

@@ -0,0 +1,132 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import "testing"
+
+func testMetric(t testing.TB) {
+	var scenarios = []struct {
+		input           LabelSet
+		fingerprint     Fingerprint
+		fastFingerprint Fingerprint
+	}{
+		{
+			input:           LabelSet{},
+			fingerprint:     14695981039346656037,
+			fastFingerprint: 14695981039346656037,
+		},
+		{
+			input: LabelSet{
+				"first_name":   "electro",
+				"occupation":   "robot",
+				"manufacturer": "westinghouse",
+			},
+			fingerprint:     5911716720268894962,
+			fastFingerprint: 11310079640881077873,
+		},
+		{
+			input: LabelSet{
+				"x": "y",
+			},
+			fingerprint:     8241431561484471700,
+			fastFingerprint: 13948396922932177635,
+		},
+		{
+			input: LabelSet{
+				"a": "bb",
+				"b": "c",
+			},
+			fingerprint:     3016285359649981711,
+			fastFingerprint: 3198632812309449502,
+		},
+		{
+			input: LabelSet{
+				"a":  "b",
+				"bb": "c",
+			},
+			fingerprint:     7122421792099404749,
+			fastFingerprint: 5774953389407657638,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		input := Metric(scenario.input)
+
+		if scenario.fingerprint != input.Fingerprint() {
+			t.Errorf("%d. expected %d, got %d", i, scenario.fingerprint, input.Fingerprint())
+		}
+		if scenario.fastFingerprint != input.FastFingerprint() {
+			t.Errorf("%d. expected %d, got %d", i, scenario.fastFingerprint, input.FastFingerprint())
+		}
+	}
+}
+
+func TestMetric(t *testing.T) {
+	testMetric(t)
+}
+
+func BenchmarkMetric(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		testMetric(b)
+	}
+}
+
+func TestMetricNameIsValid(t *testing.T) {
+	var scenarios = []struct {
+		mn    LabelValue
+		valid bool
+	}{
+		{
+			mn:    "Avalid_23name",
+			valid: true,
+		},
+		{
+			mn:    "_Avalid_23name",
+			valid: true,
+		},
+		{
+			mn:    "1valid_23name",
+			valid: false,
+		},
+		{
+			mn:    "avalid_23name",
+			valid: true,
+		},
+		{
+			mn:    "Ava:lid_23name",
+			valid: true,
+		},
+		{
+			mn:    "a lid_23name",
+			valid: false,
+		},
+		{
+			mn:    ":leading_colon",
+			valid: true,
+		},
+		{
+			mn:    "colon:in:the:middle",
+			valid: true,
+		},
+	}
+
+	for _, s := range scenarios {
+		if IsValidMetricName(s.mn) != s.valid {
+			t.Errorf("Expected %v for %q using IsValidMetricName function", s.valid, s.mn)
+		}
+		if MetricNameRE.MatchString(string(s.mn)) != s.valid {
+			t.Errorf("Expected %v for %q using regexp matching", s.valid, s.mn)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/model.go

@@ -0,0 +1,16 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package model contains common data structures that are shared across
+// Prometheus components and libraries.
+package model

gateway/vendor/github.com/prometheus/common/model/signature.go

@@ -0,0 +1,144 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"sort"
+)
+
+// SeparatorByte is a byte that cannot occur in valid UTF-8 sequences and is
+// used to separate label names, label values, and other strings from each other
+// when calculating their combined hash value (aka signature aka fingerprint).
+const SeparatorByte byte = 255
+
+var (
+	// cache the signature of an empty label set.
+	emptyLabelSignature = hashNew()
+)
+
+// LabelsToSignature returns a quasi-unique signature (i.e., fingerprint) for a
+// given label set. (Collisions are possible but unlikely if the number of label
+// sets the function is applied to is small.)
+func LabelsToSignature(labels map[string]string) uint64 {
+	if len(labels) == 0 {
+		return emptyLabelSignature
+	}
+
+	labelNames := make([]string, 0, len(labels))
+	for labelName := range labels {
+		labelNames = append(labelNames, labelName)
+	}
+	sort.Strings(labelNames)
+
+	sum := hashNew()
+	for _, labelName := range labelNames {
+		sum = hashAdd(sum, labelName)
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, labels[labelName])
+		sum = hashAddByte(sum, SeparatorByte)
+	}
+	return sum
+}
+
+// labelSetToFingerprint works exactly as LabelsToSignature but takes a LabelSet as
+// parameter (rather than a label map) and returns a Fingerprint.
+func labelSetToFingerprint(ls LabelSet) Fingerprint {
+	if len(ls) == 0 {
+		return Fingerprint(emptyLabelSignature)
+	}
+
+	labelNames := make(LabelNames, 0, len(ls))
+	for labelName := range ls {
+		labelNames = append(labelNames, labelName)
+	}
+	sort.Sort(labelNames)
+
+	sum := hashNew()
+	for _, labelName := range labelNames {
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(ls[labelName]))
+		sum = hashAddByte(sum, SeparatorByte)
+	}
+	return Fingerprint(sum)
+}
+
+// labelSetToFastFingerprint works similar to labelSetToFingerprint but uses a
+// faster and less allocation-heavy hash function, which is more susceptible to
+// create hash collisions. Therefore, collision detection should be applied.
+func labelSetToFastFingerprint(ls LabelSet) Fingerprint {
+	if len(ls) == 0 {
+		return Fingerprint(emptyLabelSignature)
+	}
+
+	var result uint64
+	for labelName, labelValue := range ls {
+		sum := hashNew()
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(labelValue))
+		result ^= sum
+	}
+	return Fingerprint(result)
+}
+
+// SignatureForLabels works like LabelsToSignature but takes a Metric as
+// parameter (rather than a label map) and only includes the labels with the
+// specified LabelNames into the signature calculation. The labels passed in
+// will be sorted by this function.
+func SignatureForLabels(m Metric, labels ...LabelName) uint64 {
+	if len(labels) == 0 {
+		return emptyLabelSignature
+	}
+
+	sort.Sort(LabelNames(labels))
+
+	sum := hashNew()
+	for _, label := range labels {
+		sum = hashAdd(sum, string(label))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(m[label]))
+		sum = hashAddByte(sum, SeparatorByte)
+	}
+	return sum
+}
+
+// SignatureWithoutLabels works like LabelsToSignature but takes a Metric as
+// parameter (rather than a label map) and excludes the labels with any of the
+// specified LabelNames from the signature calculation.
+func SignatureWithoutLabels(m Metric, labels map[LabelName]struct{}) uint64 {
+	if len(m) == 0 {
+		return emptyLabelSignature
+	}
+
+	labelNames := make(LabelNames, 0, len(m))
+	for labelName := range m {
+		if _, exclude := labels[labelName]; !exclude {
+			labelNames = append(labelNames, labelName)
+		}
+	}
+	if len(labelNames) == 0 {
+		return emptyLabelSignature
+	}
+	sort.Sort(labelNames)
+
+	sum := hashNew()
+	for _, labelName := range labelNames {
+		sum = hashAdd(sum, string(labelName))
+		sum = hashAddByte(sum, SeparatorByte)
+		sum = hashAdd(sum, string(m[labelName]))
+		sum = hashAddByte(sum, SeparatorByte)
+	}
+	return sum
+}

gateway/vendor/github.com/prometheus/common/model/signature_test.go

@@ -0,0 +1,314 @@
+// Copyright 2014 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"runtime"
+	"sync"
+	"testing"
+)
+
+func TestLabelsToSignature(t *testing.T) {
+	var scenarios = []struct {
+		in  map[string]string
+		out uint64
+	}{
+		{
+			in:  map[string]string{},
+			out: 14695981039346656037,
+		},
+		{
+			in:  map[string]string{"name": "garland, briggs", "fear": "love is not enough"},
+			out: 5799056148416392346,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		actual := LabelsToSignature(scenario.in)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
+}
+
+func TestMetricToFingerprint(t *testing.T) {
+	var scenarios = []struct {
+		in  LabelSet
+		out Fingerprint
+	}{
+		{
+			in:  LabelSet{},
+			out: 14695981039346656037,
+		},
+		{
+			in:  LabelSet{"name": "garland, briggs", "fear": "love is not enough"},
+			out: 5799056148416392346,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		actual := labelSetToFingerprint(scenario.in)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
+}
+
+func TestMetricToFastFingerprint(t *testing.T) {
+	var scenarios = []struct {
+		in  LabelSet
+		out Fingerprint
+	}{
+		{
+			in:  LabelSet{},
+			out: 14695981039346656037,
+		},
+		{
+			in:  LabelSet{"name": "garland, briggs", "fear": "love is not enough"},
+			out: 12952432476264840823,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		actual := labelSetToFastFingerprint(scenario.in)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
+}
+
+func TestSignatureForLabels(t *testing.T) {
+	var scenarios = []struct {
+		in     Metric
+		labels LabelNames
+		out    uint64
+	}{
+		{
+			in:     Metric{},
+			labels: nil,
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{},
+			labels: LabelNames{"empty"},
+			out:    7187873163539638612,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: LabelNames{"empty"},
+			out:    7187873163539638612,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: LabelNames{"fear", "name"},
+			out:    5799056148416392346,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough", "foo": "bar"},
+			labels: LabelNames{"fear", "name"},
+			out:    5799056148416392346,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: LabelNames{},
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: nil,
+			out:    14695981039346656037,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		actual := SignatureForLabels(scenario.in, scenario.labels...)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
+}
+
+func TestSignatureWithoutLabels(t *testing.T) {
+	var scenarios = []struct {
+		in     Metric
+		labels map[LabelName]struct{}
+		out    uint64
+	}{
+		{
+			in:     Metric{},
+			labels: nil,
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: map[LabelName]struct{}{"fear": struct{}{}, "name": struct{}{}},
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough", "foo": "bar"},
+			labels: map[LabelName]struct{}{"foo": struct{}{}},
+			out:    5799056148416392346,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: map[LabelName]struct{}{},
+			out:    5799056148416392346,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: nil,
+			out:    5799056148416392346,
+		},
+	}
+
+	for i, scenario := range scenarios {
+		actual := SignatureWithoutLabels(scenario.in, scenario.labels)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
+}
+
+func benchmarkLabelToSignature(b *testing.B, l map[string]string, e uint64) {
+	for i := 0; i < b.N; i++ {
+		if a := LabelsToSignature(l); a != e {
+			b.Fatalf("expected signature of %d for %s, got %d", e, l, a)
+		}
+	}
+}
+
+func BenchmarkLabelToSignatureScalar(b *testing.B) {
+	benchmarkLabelToSignature(b, nil, 14695981039346656037)
+}
+
+func BenchmarkLabelToSignatureSingle(b *testing.B) {
+	benchmarkLabelToSignature(b, map[string]string{"first-label": "first-label-value"}, 5146282821936882169)
+}
+
+func BenchmarkLabelToSignatureDouble(b *testing.B) {
+	benchmarkLabelToSignature(b, map[string]string{"first-label": "first-label-value", "second-label": "second-label-value"}, 3195800080984914717)
+}
+
+func BenchmarkLabelToSignatureTriple(b *testing.B) {
+	benchmarkLabelToSignature(b, map[string]string{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 13843036195897128121)
+}
+
+func benchmarkMetricToFingerprint(b *testing.B, ls LabelSet, e Fingerprint) {
+	for i := 0; i < b.N; i++ {
+		if a := labelSetToFingerprint(ls); a != e {
+			b.Fatalf("expected signature of %d for %s, got %d", e, ls, a)
+		}
+	}
+}
+
+func BenchmarkMetricToFingerprintScalar(b *testing.B) {
+	benchmarkMetricToFingerprint(b, nil, 14695981039346656037)
+}
+
+func BenchmarkMetricToFingerprintSingle(b *testing.B) {
+	benchmarkMetricToFingerprint(b, LabelSet{"first-label": "first-label-value"}, 5146282821936882169)
+}
+
+func BenchmarkMetricToFingerprintDouble(b *testing.B) {
+	benchmarkMetricToFingerprint(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value"}, 3195800080984914717)
+}
+
+func BenchmarkMetricToFingerprintTriple(b *testing.B) {
+	benchmarkMetricToFingerprint(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 13843036195897128121)
+}
+
+func benchmarkMetricToFastFingerprint(b *testing.B, ls LabelSet, e Fingerprint) {
+	for i := 0; i < b.N; i++ {
+		if a := labelSetToFastFingerprint(ls); a != e {
+			b.Fatalf("expected signature of %d for %s, got %d", e, ls, a)
+		}
+	}
+}
+
+func BenchmarkMetricToFastFingerprintScalar(b *testing.B) {
+	benchmarkMetricToFastFingerprint(b, nil, 14695981039346656037)
+}
+
+func BenchmarkMetricToFastFingerprintSingle(b *testing.B) {
+	benchmarkMetricToFastFingerprint(b, LabelSet{"first-label": "first-label-value"}, 5147259542624943964)
+}
+
+func BenchmarkMetricToFastFingerprintDouble(b *testing.B) {
+	benchmarkMetricToFastFingerprint(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value"}, 18269973311206963528)
+}
+
+func BenchmarkMetricToFastFingerprintTriple(b *testing.B) {
+	benchmarkMetricToFastFingerprint(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676)
+}
+
+func BenchmarkEmptyLabelSignature(b *testing.B) {
+	input := []map[string]string{nil, {}}
+
+	var ms runtime.MemStats
+	runtime.ReadMemStats(&ms)
+
+	alloc := ms.Alloc
+
+	for _, labels := range input {
+		LabelsToSignature(labels)
+	}
+
+	runtime.ReadMemStats(&ms)
+
+	if got := ms.Alloc; alloc != got {
+		b.Fatal("expected LabelsToSignature with empty labels not to perform allocations")
+	}
+}
+
+func benchmarkMetricToFastFingerprintConc(b *testing.B, ls LabelSet, e Fingerprint, concLevel int) {
+	var start, end sync.WaitGroup
+	start.Add(1)
+	end.Add(concLevel)
+
+	for i := 0; i < concLevel; i++ {
+		go func() {
+			start.Wait()
+			for j := b.N / concLevel; j >= 0; j-- {
+				if a := labelSetToFastFingerprint(ls); a != e {
+					b.Fatalf("expected signature of %d for %s, got %d", e, ls, a)
+				}
+			}
+			end.Done()
+		}()
+	}
+	b.ResetTimer()
+	start.Done()
+	end.Wait()
+}
+
+func BenchmarkMetricToFastFingerprintTripleConc1(b *testing.B) {
+	benchmarkMetricToFastFingerprintConc(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 1)
+}
+
+func BenchmarkMetricToFastFingerprintTripleConc2(b *testing.B) {
+	benchmarkMetricToFastFingerprintConc(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 2)
+}
+
+func BenchmarkMetricToFastFingerprintTripleConc4(b *testing.B) {
+	benchmarkMetricToFastFingerprintConc(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 4)
+}
+
+func BenchmarkMetricToFastFingerprintTripleConc8(b *testing.B) {
+	benchmarkMetricToFastFingerprintConc(b, LabelSet{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 8)
+}

gateway/vendor/github.com/prometheus/common/model/silence.go

@@ -0,0 +1,106 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"time"
+)
+
+// Matcher describes a matches the value of a given label.
+type Matcher struct {
+	Name    LabelName `json:"name"`
+	Value   string    `json:"value"`
+	IsRegex bool      `json:"isRegex"`
+}
+
+func (m *Matcher) UnmarshalJSON(b []byte) error {
+	type plain Matcher
+	if err := json.Unmarshal(b, (*plain)(m)); err != nil {
+		return err
+	}
+
+	if len(m.Name) == 0 {
+		return fmt.Errorf("label name in matcher must not be empty")
+	}
+	if m.IsRegex {
+		if _, err := regexp.Compile(m.Value); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Validate returns true iff all fields of the matcher have valid values.
+func (m *Matcher) Validate() error {
+	if !m.Name.IsValid() {
+		return fmt.Errorf("invalid name %q", m.Name)
+	}
+	if m.IsRegex {
+		if _, err := regexp.Compile(m.Value); err != nil {
+			return fmt.Errorf("invalid regular expression %q", m.Value)
+		}
+	} else if !LabelValue(m.Value).IsValid() || len(m.Value) == 0 {
+		return fmt.Errorf("invalid value %q", m.Value)
+	}
+	return nil
+}
+
+// Silence defines the representation of a silence definiton
+// in the Prometheus eco-system.
+type Silence struct {
+	ID uint64 `json:"id,omitempty"`
+
+	Matchers []*Matcher `json:"matchers"`
+
+	StartsAt time.Time `json:"startsAt"`
+	EndsAt   time.Time `json:"endsAt"`
+
+	CreatedAt time.Time `json:"createdAt,omitempty"`
+	CreatedBy string    `json:"createdBy"`
+	Comment   string    `json:"comment,omitempty"`
+}
+
+// Validate returns true iff all fields of the silence have valid values.
+func (s *Silence) Validate() error {
+	if len(s.Matchers) == 0 {
+		return fmt.Errorf("at least one matcher required")
+	}
+	for _, m := range s.Matchers {
+		if err := m.Validate(); err != nil {
+			return fmt.Errorf("invalid matcher: %s", err)
+		}
+	}
+	if s.StartsAt.IsZero() {
+		return fmt.Errorf("start time missing")
+	}
+	if s.EndsAt.IsZero() {
+		return fmt.Errorf("end time missing")
+	}
+	if s.EndsAt.Before(s.StartsAt) {
+		return fmt.Errorf("start time must be before end time")
+	}
+	if s.CreatedBy == "" {
+		return fmt.Errorf("creator information missing")
+	}
+	if s.Comment == "" {
+		return fmt.Errorf("comment missing")
+	}
+	if s.CreatedAt.IsZero() {
+		return fmt.Errorf("creation timestamp missing")
+	}
+	return nil
+}

gateway/vendor/github.com/prometheus/common/model/silence_test.go

@@ -0,0 +1,228 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestMatcherValidate(t *testing.T) {
+	var cases = []struct {
+		matcher *Matcher
+		err     string
+	}{
+		{
+			matcher: &Matcher{
+				Name:  "name",
+				Value: "value",
+			},
+		},
+		{
+			matcher: &Matcher{
+				Name:    "name",
+				Value:   "value",
+				IsRegex: true,
+			},
+		},
+		{
+			matcher: &Matcher{
+				Name:  "name!",
+				Value: "value",
+			},
+			err: "invalid name",
+		},
+		{
+			matcher: &Matcher{
+				Name:  "",
+				Value: "value",
+			},
+			err: "invalid name",
+		},
+		{
+			matcher: &Matcher{
+				Name:  "name",
+				Value: "value\xff",
+			},
+			err: "invalid value",
+		},
+		{
+			matcher: &Matcher{
+				Name:  "name",
+				Value: "",
+			},
+			err: "invalid value",
+		},
+	}
+
+	for i, c := range cases {
+		err := c.matcher.Validate()
+		if err == nil {
+			if c.err == "" {
+				continue
+			}
+			t.Errorf("%d. Expected error %q but got none", i, c.err)
+			continue
+		}
+		if c.err == "" && err != nil {
+			t.Errorf("%d. Expected no error but got %q", i, err)
+			continue
+		}
+		if !strings.Contains(err.Error(), c.err) {
+			t.Errorf("%d. Expected error to contain %q but got %q", i, c.err, err)
+		}
+	}
+}
+
+func TestSilenceValidate(t *testing.T) {
+	ts := time.Now()
+
+	var cases = []struct {
+		sil *Silence
+		err string
+	}{
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+					{Name: "name", Value: "value"},
+					{Name: "name", Value: "value"},
+					{Name: "name", Value: "value", IsRegex: true},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts.Add(-1 * time.Minute),
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+			err: "start time must be before end time",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+			err: "end time missing",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				EndsAt:    ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+			err: "start time missing",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "!name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+			err: "invalid matcher",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedAt: ts,
+				CreatedBy: "name",
+			},
+			err: "comment missing",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedBy: "name",
+				Comment:   "comment",
+			},
+			err: "creation timestamp missing",
+		},
+		{
+			sil: &Silence{
+				Matchers: []*Matcher{
+					{Name: "name", Value: "value"},
+				},
+				StartsAt:  ts,
+				EndsAt:    ts,
+				CreatedAt: ts,
+				Comment:   "comment",
+			},
+			err: "creator information missing",
+		},
+	}
+
+	for i, c := range cases {
+		err := c.sil.Validate()
+		if err == nil {
+			if c.err == "" {
+				continue
+			}
+			t.Errorf("%d. Expected error %q but got none", i, c.err)
+			continue
+		}
+		if c.err == "" && err != nil {
+			t.Errorf("%d. Expected no error but got %q", i, err)
+			continue
+		}
+		if !strings.Contains(err.Error(), c.err) {
+			t.Errorf("%d. Expected error to contain %q but got %q", i, c.err, err)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/time.go

@@ -0,0 +1,249 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"fmt"
+	"math"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	// MinimumTick is the minimum supported time resolution. This has to be
+	// at least time.Second in order for the code below to work.
+	minimumTick = time.Millisecond
+	// second is the Time duration equivalent to one second.
+	second = int64(time.Second / minimumTick)
+	// The number of nanoseconds per minimum tick.
+	nanosPerTick = int64(minimumTick / time.Nanosecond)
+
+	// Earliest is the earliest Time representable. Handy for
+	// initializing a high watermark.
+	Earliest = Time(math.MinInt64)
+	// Latest is the latest Time representable. Handy for initializing
+	// a low watermark.
+	Latest = Time(math.MaxInt64)
+)
+
+// Time is the number of milliseconds since the epoch
+// (1970-01-01 00:00 UTC) excluding leap seconds.
+type Time int64
+
+// Interval describes and interval between two timestamps.
+type Interval struct {
+	Start, End Time
+}
+
+// Now returns the current time as a Time.
+func Now() Time {
+	return TimeFromUnixNano(time.Now().UnixNano())
+}
+
+// TimeFromUnix returns the Time equivalent to the Unix Time t
+// provided in seconds.
+func TimeFromUnix(t int64) Time {
+	return Time(t * second)
+}
+
+// TimeFromUnixNano returns the Time equivalent to the Unix Time
+// t provided in nanoseconds.
+func TimeFromUnixNano(t int64) Time {
+	return Time(t / nanosPerTick)
+}
+
+// Equal reports whether two Times represent the same instant.
+func (t Time) Equal(o Time) bool {
+	return t == o
+}
+
+// Before reports whether the Time t is before o.
+func (t Time) Before(o Time) bool {
+	return t < o
+}
+
+// After reports whether the Time t is after o.
+func (t Time) After(o Time) bool {
+	return t > o
+}
+
+// Add returns the Time t + d.
+func (t Time) Add(d time.Duration) Time {
+	return t + Time(d/minimumTick)
+}
+
+// Sub returns the Duration t - o.
+func (t Time) Sub(o Time) time.Duration {
+	return time.Duration(t-o) * minimumTick
+}
+
+// Time returns the time.Time representation of t.
+func (t Time) Time() time.Time {
+	return time.Unix(int64(t)/second, (int64(t)%second)*nanosPerTick)
+}
+
+// Unix returns t as a Unix time, the number of seconds elapsed
+// since January 1, 1970 UTC.
+func (t Time) Unix() int64 {
+	return int64(t) / second
+}
+
+// UnixNano returns t as a Unix time, the number of nanoseconds elapsed
+// since January 1, 1970 UTC.
+func (t Time) UnixNano() int64 {
+	return int64(t) * nanosPerTick
+}
+
+// The number of digits after the dot.
+var dotPrecision = int(math.Log10(float64(second)))
+
+// String returns a string representation of the Time.
+func (t Time) String() string {
+	return strconv.FormatFloat(float64(t)/float64(second), 'f', -1, 64)
+}
+
+// MarshalJSON implements the json.Marshaler interface.
+func (t Time) MarshalJSON() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface.
+func (t *Time) UnmarshalJSON(b []byte) error {
+	p := strings.Split(string(b), ".")
+	switch len(p) {
+	case 1:
+		v, err := strconv.ParseInt(string(p[0]), 10, 64)
+		if err != nil {
+			return err
+		}
+		*t = Time(v * second)
+
+	case 2:
+		v, err := strconv.ParseInt(string(p[0]), 10, 64)
+		if err != nil {
+			return err
+		}
+		v *= second
+
+		prec := dotPrecision - len(p[1])
+		if prec < 0 {
+			p[1] = p[1][:dotPrecision]
+		} else if prec > 0 {
+			p[1] = p[1] + strings.Repeat("0", prec)
+		}
+
+		va, err := strconv.ParseInt(p[1], 10, 32)
+		if err != nil {
+			return err
+		}
+
+		*t = Time(v + va)
+
+	default:
+		return fmt.Errorf("invalid time %q", string(b))
+	}
+	return nil
+}
+
+// Duration wraps time.Duration. It is used to parse the custom duration format
+// from YAML.
+// This type should not propagate beyond the scope of input/output processing.
+type Duration time.Duration
+
+var durationRE = regexp.MustCompile("^([0-9]+)(y|w|d|h|m|s|ms)$")
+
+// StringToDuration parses a string into a time.Duration, assuming that a year
+// always has 365d, a week always has 7d, and a day always has 24h.
+func ParseDuration(durationStr string) (Duration, error) {
+	matches := durationRE.FindStringSubmatch(durationStr)
+	if len(matches) != 3 {
+		return 0, fmt.Errorf("not a valid duration string: %q", durationStr)
+	}
+	var (
+		n, _ = strconv.Atoi(matches[1])
+		dur  = time.Duration(n) * time.Millisecond
+	)
+	switch unit := matches[2]; unit {
+	case "y":
+		dur *= 1000 * 60 * 60 * 24 * 365
+	case "w":
+		dur *= 1000 * 60 * 60 * 24 * 7
+	case "d":
+		dur *= 1000 * 60 * 60 * 24
+	case "h":
+		dur *= 1000 * 60 * 60
+	case "m":
+		dur *= 1000 * 60
+	case "s":
+		dur *= 1000
+	case "ms":
+		// Value already correct
+	default:
+		return 0, fmt.Errorf("invalid time unit in duration string: %q", unit)
+	}
+	return Duration(dur), nil
+}
+
+func (d Duration) String() string {
+	var (
+		ms   = int64(time.Duration(d) / time.Millisecond)
+		unit = "ms"
+	)
+	factors := map[string]int64{
+		"y":  1000 * 60 * 60 * 24 * 365,
+		"w":  1000 * 60 * 60 * 24 * 7,
+		"d":  1000 * 60 * 60 * 24,
+		"h":  1000 * 60 * 60,
+		"m":  1000 * 60,
+		"s":  1000,
+		"ms": 1,
+	}
+
+	switch int64(0) {
+	case ms % factors["y"]:
+		unit = "y"
+	case ms % factors["w"]:
+		unit = "w"
+	case ms % factors["d"]:
+		unit = "d"
+	case ms % factors["h"]:
+		unit = "h"
+	case ms % factors["m"]:
+		unit = "m"
+	case ms % factors["s"]:
+		unit = "s"
+	}
+	return fmt.Sprintf("%v%v", ms/factors[unit], unit)
+}
+
+// MarshalYAML implements the yaml.Marshaler interface.
+func (d Duration) MarshalYAML() (interface{}, error) {
+	return d.String(), nil
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (d *Duration) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+	dur, err := ParseDuration(s)
+	if err != nil {
+		return err
+	}
+	*d = dur
+	return nil
+}

gateway/vendor/github.com/prometheus/common/model/time_test.go

@@ -0,0 +1,129 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"testing"
+	"time"
+)
+
+func TestComparators(t *testing.T) {
+	t1a := TimeFromUnix(0)
+	t1b := TimeFromUnix(0)
+	t2 := TimeFromUnix(2*second - 1)
+
+	if !t1a.Equal(t1b) {
+		t.Fatalf("Expected %s to be equal to %s", t1a, t1b)
+	}
+	if t1a.Equal(t2) {
+		t.Fatalf("Expected %s to not be equal to %s", t1a, t2)
+	}
+
+	if !t1a.Before(t2) {
+		t.Fatalf("Expected %s to be before %s", t1a, t2)
+	}
+	if t1a.Before(t1b) {
+		t.Fatalf("Expected %s to not be before %s", t1a, t1b)
+	}
+
+	if !t2.After(t1a) {
+		t.Fatalf("Expected %s to be after %s", t2, t1a)
+	}
+	if t1b.After(t1a) {
+		t.Fatalf("Expected %s to not be after %s", t1b, t1a)
+	}
+}
+
+func TestTimeConversions(t *testing.T) {
+	unixSecs := int64(1136239445)
+	unixNsecs := int64(123456789)
+	unixNano := unixSecs*1e9 + unixNsecs
+
+	t1 := time.Unix(unixSecs, unixNsecs-unixNsecs%nanosPerTick)
+	t2 := time.Unix(unixSecs, unixNsecs)
+
+	ts := TimeFromUnixNano(unixNano)
+	if !ts.Time().Equal(t1) {
+		t.Fatalf("Expected %s, got %s", t1, ts.Time())
+	}
+
+	// Test available precision.
+	ts = TimeFromUnixNano(t2.UnixNano())
+	if !ts.Time().Equal(t1) {
+		t.Fatalf("Expected %s, got %s", t1, ts.Time())
+	}
+
+	if ts.UnixNano() != unixNano-unixNano%nanosPerTick {
+		t.Fatalf("Expected %d, got %d", unixNano, ts.UnixNano())
+	}
+}
+
+func TestDuration(t *testing.T) {
+	duration := time.Second + time.Minute + time.Hour
+	goTime := time.Unix(1136239445, 0)
+
+	ts := TimeFromUnix(goTime.Unix())
+	if !goTime.Add(duration).Equal(ts.Add(duration).Time()) {
+		t.Fatalf("Expected %s to be equal to %s", goTime.Add(duration), ts.Add(duration))
+	}
+
+	earlier := ts.Add(-duration)
+	delta := ts.Sub(earlier)
+	if delta != duration {
+		t.Fatalf("Expected %s to be equal to %s", delta, duration)
+	}
+}
+
+func TestParseDuration(t *testing.T) {
+	var cases = []struct {
+		in  string
+		out time.Duration
+	}{
+		{
+			in:  "324ms",
+			out: 324 * time.Millisecond,
+		}, {
+			in:  "3s",
+			out: 3 * time.Second,
+		}, {
+			in:  "5m",
+			out: 5 * time.Minute,
+		}, {
+			in:  "1h",
+			out: time.Hour,
+		}, {
+			in:  "4d",
+			out: 4 * 24 * time.Hour,
+		}, {
+			in:  "3w",
+			out: 3 * 7 * 24 * time.Hour,
+		}, {
+			in:  "10y",
+			out: 10 * 365 * 24 * time.Hour,
+		},
+	}
+
+	for _, c := range cases {
+		d, err := ParseDuration(c.in)
+		if err != nil {
+			t.Errorf("Unexpected error on input %q", c.in)
+		}
+		if time.Duration(d) != c.out {
+			t.Errorf("Expected %v but got %v", c.out, d)
+		}
+		if d.String() != c.in {
+			t.Errorf("Expected duration string %q but got %q", c.in, d.String())
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/model/value.go

@@ -0,0 +1,416 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"math"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+var (
+	// ZeroSamplePair is the pseudo zero-value of SamplePair used to signal a
+	// non-existing sample pair. It is a SamplePair with timestamp Earliest and
+	// value 0.0. Note that the natural zero value of SamplePair has a timestamp
+	// of 0, which is possible to appear in a real SamplePair and thus not
+	// suitable to signal a non-existing SamplePair.
+	ZeroSamplePair = SamplePair{Timestamp: Earliest}
+
+	// ZeroSample is the pseudo zero-value of Sample used to signal a
+	// non-existing sample. It is a Sample with timestamp Earliest, value 0.0,
+	// and metric nil. Note that the natural zero value of Sample has a timestamp
+	// of 0, which is possible to appear in a real Sample and thus not suitable
+	// to signal a non-existing Sample.
+	ZeroSample = Sample{Timestamp: Earliest}
+)
+
+// A SampleValue is a representation of a value for a given sample at a given
+// time.
+type SampleValue float64
+
+// MarshalJSON implements json.Marshaler.
+func (v SampleValue) MarshalJSON() ([]byte, error) {
+	return json.Marshal(v.String())
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (v *SampleValue) UnmarshalJSON(b []byte) error {
+	if len(b) < 2 || b[0] != '"' || b[len(b)-1] != '"' {
+		return fmt.Errorf("sample value must be a quoted string")
+	}
+	f, err := strconv.ParseFloat(string(b[1:len(b)-1]), 64)
+	if err != nil {
+		return err
+	}
+	*v = SampleValue(f)
+	return nil
+}
+
+// Equal returns true if the value of v and o is equal or if both are NaN. Note
+// that v==o is false if both are NaN. If you want the conventional float
+// behavior, use == to compare two SampleValues.
+func (v SampleValue) Equal(o SampleValue) bool {
+	if v == o {
+		return true
+	}
+	return math.IsNaN(float64(v)) && math.IsNaN(float64(o))
+}
+
+func (v SampleValue) String() string {
+	return strconv.FormatFloat(float64(v), 'f', -1, 64)
+}
+
+// SamplePair pairs a SampleValue with a Timestamp.
+type SamplePair struct {
+	Timestamp Time
+	Value     SampleValue
+}
+
+// MarshalJSON implements json.Marshaler.
+func (s SamplePair) MarshalJSON() ([]byte, error) {
+	t, err := json.Marshal(s.Timestamp)
+	if err != nil {
+		return nil, err
+	}
+	v, err := json.Marshal(s.Value)
+	if err != nil {
+		return nil, err
+	}
+	return []byte(fmt.Sprintf("[%s,%s]", t, v)), nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *SamplePair) UnmarshalJSON(b []byte) error {
+	v := [...]json.Unmarshaler{&s.Timestamp, &s.Value}
+	return json.Unmarshal(b, &v)
+}
+
+// Equal returns true if this SamplePair and o have equal Values and equal
+// Timestamps. The sematics of Value equality is defined by SampleValue.Equal.
+func (s *SamplePair) Equal(o *SamplePair) bool {
+	return s == o || (s.Value.Equal(o.Value) && s.Timestamp.Equal(o.Timestamp))
+}
+
+func (s SamplePair) String() string {
+	return fmt.Sprintf("%s @[%s]", s.Value, s.Timestamp)
+}
+
+// Sample is a sample pair associated with a metric.
+type Sample struct {
+	Metric    Metric      `json:"metric"`
+	Value     SampleValue `json:"value"`
+	Timestamp Time        `json:"timestamp"`
+}
+
+// Equal compares first the metrics, then the timestamp, then the value. The
+// sematics of value equality is defined by SampleValue.Equal.
+func (s *Sample) Equal(o *Sample) bool {
+	if s == o {
+		return true
+	}
+
+	if !s.Metric.Equal(o.Metric) {
+		return false
+	}
+	if !s.Timestamp.Equal(o.Timestamp) {
+		return false
+	}
+
+	return s.Value.Equal(o.Value)
+}
+
+func (s Sample) String() string {
+	return fmt.Sprintf("%s => %s", s.Metric, SamplePair{
+		Timestamp: s.Timestamp,
+		Value:     s.Value,
+	})
+}
+
+// MarshalJSON implements json.Marshaler.
+func (s Sample) MarshalJSON() ([]byte, error) {
+	v := struct {
+		Metric Metric     `json:"metric"`
+		Value  SamplePair `json:"value"`
+	}{
+		Metric: s.Metric,
+		Value: SamplePair{
+			Timestamp: s.Timestamp,
+			Value:     s.Value,
+		},
+	}
+
+	return json.Marshal(&v)
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *Sample) UnmarshalJSON(b []byte) error {
+	v := struct {
+		Metric Metric     `json:"metric"`
+		Value  SamplePair `json:"value"`
+	}{
+		Metric: s.Metric,
+		Value: SamplePair{
+			Timestamp: s.Timestamp,
+			Value:     s.Value,
+		},
+	}
+
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+
+	s.Metric = v.Metric
+	s.Timestamp = v.Value.Timestamp
+	s.Value = v.Value.Value
+
+	return nil
+}
+
+// Samples is a sortable Sample slice. It implements sort.Interface.
+type Samples []*Sample
+
+func (s Samples) Len() int {
+	return len(s)
+}
+
+// Less compares first the metrics, then the timestamp.
+func (s Samples) Less(i, j int) bool {
+	switch {
+	case s[i].Metric.Before(s[j].Metric):
+		return true
+	case s[j].Metric.Before(s[i].Metric):
+		return false
+	case s[i].Timestamp.Before(s[j].Timestamp):
+		return true
+	default:
+		return false
+	}
+}
+
+func (s Samples) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+// Equal compares two sets of samples and returns true if they are equal.
+func (s Samples) Equal(o Samples) bool {
+	if len(s) != len(o) {
+		return false
+	}
+
+	for i, sample := range s {
+		if !sample.Equal(o[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// SampleStream is a stream of Values belonging to an attached COWMetric.
+type SampleStream struct {
+	Metric Metric       `json:"metric"`
+	Values []SamplePair `json:"values"`
+}
+
+func (ss SampleStream) String() string {
+	vals := make([]string, len(ss.Values))
+	for i, v := range ss.Values {
+		vals[i] = v.String()
+	}
+	return fmt.Sprintf("%s =>\n%s", ss.Metric, strings.Join(vals, "\n"))
+}
+
+// Value is a generic interface for values resulting from a query evaluation.
+type Value interface {
+	Type() ValueType
+	String() string
+}
+
+func (Matrix) Type() ValueType  { return ValMatrix }
+func (Vector) Type() ValueType  { return ValVector }
+func (*Scalar) Type() ValueType { return ValScalar }
+func (*String) Type() ValueType { return ValString }
+
+type ValueType int
+
+const (
+	ValNone ValueType = iota
+	ValScalar
+	ValVector
+	ValMatrix
+	ValString
+)
+
+// MarshalJSON implements json.Marshaler.
+func (et ValueType) MarshalJSON() ([]byte, error) {
+	return json.Marshal(et.String())
+}
+
+func (et *ValueType) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	switch s {
+	case "<ValNone>":
+		*et = ValNone
+	case "scalar":
+		*et = ValScalar
+	case "vector":
+		*et = ValVector
+	case "matrix":
+		*et = ValMatrix
+	case "string":
+		*et = ValString
+	default:
+		return fmt.Errorf("unknown value type %q", s)
+	}
+	return nil
+}
+
+func (e ValueType) String() string {
+	switch e {
+	case ValNone:
+		return "<ValNone>"
+	case ValScalar:
+		return "scalar"
+	case ValVector:
+		return "vector"
+	case ValMatrix:
+		return "matrix"
+	case ValString:
+		return "string"
+	}
+	panic("ValueType.String: unhandled value type")
+}
+
+// Scalar is a scalar value evaluated at the set timestamp.
+type Scalar struct {
+	Value     SampleValue `json:"value"`
+	Timestamp Time        `json:"timestamp"`
+}
+
+func (s Scalar) String() string {
+	return fmt.Sprintf("scalar: %v @[%v]", s.Value, s.Timestamp)
+}
+
+// MarshalJSON implements json.Marshaler.
+func (s Scalar) MarshalJSON() ([]byte, error) {
+	v := strconv.FormatFloat(float64(s.Value), 'f', -1, 64)
+	return json.Marshal([...]interface{}{s.Timestamp, string(v)})
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *Scalar) UnmarshalJSON(b []byte) error {
+	var f string
+	v := [...]interface{}{&s.Timestamp, &f}
+
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+
+	value, err := strconv.ParseFloat(f, 64)
+	if err != nil {
+		return fmt.Errorf("error parsing sample value: %s", err)
+	}
+	s.Value = SampleValue(value)
+	return nil
+}
+
+// String is a string value evaluated at the set timestamp.
+type String struct {
+	Value     string `json:"value"`
+	Timestamp Time   `json:"timestamp"`
+}
+
+func (s *String) String() string {
+	return s.Value
+}
+
+// MarshalJSON implements json.Marshaler.
+func (s String) MarshalJSON() ([]byte, error) {
+	return json.Marshal([]interface{}{s.Timestamp, s.Value})
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *String) UnmarshalJSON(b []byte) error {
+	v := [...]interface{}{&s.Timestamp, &s.Value}
+	return json.Unmarshal(b, &v)
+}
+
+// Vector is basically only an alias for Samples, but the
+// contract is that in a Vector, all Samples have the same timestamp.
+type Vector []*Sample
+
+func (vec Vector) String() string {
+	entries := make([]string, len(vec))
+	for i, s := range vec {
+		entries[i] = s.String()
+	}
+	return strings.Join(entries, "\n")
+}
+
+func (vec Vector) Len() int      { return len(vec) }
+func (vec Vector) Swap(i, j int) { vec[i], vec[j] = vec[j], vec[i] }
+
+// Less compares first the metrics, then the timestamp.
+func (vec Vector) Less(i, j int) bool {
+	switch {
+	case vec[i].Metric.Before(vec[j].Metric):
+		return true
+	case vec[j].Metric.Before(vec[i].Metric):
+		return false
+	case vec[i].Timestamp.Before(vec[j].Timestamp):
+		return true
+	default:
+		return false
+	}
+}
+
+// Equal compares two sets of samples and returns true if they are equal.
+func (vec Vector) Equal(o Vector) bool {
+	if len(vec) != len(o) {
+		return false
+	}
+
+	for i, sample := range vec {
+		if !sample.Equal(o[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// Matrix is a list of time series.
+type Matrix []*SampleStream
+
+func (m Matrix) Len() int           { return len(m) }
+func (m Matrix) Less(i, j int) bool { return m[i].Metric.Before(m[j].Metric) }
+func (m Matrix) Swap(i, j int)      { m[i], m[j] = m[j], m[i] }
+
+func (mat Matrix) String() string {
+	matCp := make(Matrix, len(mat))
+	copy(matCp, mat)
+	sort.Sort(matCp)
+
+	strs := make([]string, len(matCp))
+
+	for i, ss := range matCp {
+		strs[i] = ss.String()
+	}
+
+	return strings.Join(strs, "\n")
+}

gateway/vendor/github.com/prometheus/common/model/value_test.go

@@ -0,0 +1,468 @@
+// Copyright 2013 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+import (
+	"encoding/json"
+	"math"
+	"reflect"
+	"sort"
+	"testing"
+)
+
+func TestEqualValues(t *testing.T) {
+	tests := map[string]struct {
+		in1, in2 SampleValue
+		want     bool
+	}{
+		"equal floats": {
+			in1:  3.14,
+			in2:  3.14,
+			want: true,
+		},
+		"unequal floats": {
+			in1:  3.14,
+			in2:  3.1415,
+			want: false,
+		},
+		"positive inifinities": {
+			in1:  SampleValue(math.Inf(+1)),
+			in2:  SampleValue(math.Inf(+1)),
+			want: true,
+		},
+		"negative inifinities": {
+			in1:  SampleValue(math.Inf(-1)),
+			in2:  SampleValue(math.Inf(-1)),
+			want: true,
+		},
+		"different inifinities": {
+			in1:  SampleValue(math.Inf(+1)),
+			in2:  SampleValue(math.Inf(-1)),
+			want: false,
+		},
+		"number and infinity": {
+			in1:  42,
+			in2:  SampleValue(math.Inf(+1)),
+			want: false,
+		},
+		"number and NaN": {
+			in1:  42,
+			in2:  SampleValue(math.NaN()),
+			want: false,
+		},
+		"NaNs": {
+			in1:  SampleValue(math.NaN()),
+			in2:  SampleValue(math.NaN()),
+			want: true, // !!!
+		},
+	}
+
+	for name, test := range tests {
+		got := test.in1.Equal(test.in2)
+		if got != test.want {
+			t.Errorf("Comparing %s, %f and %f: got %t, want %t", name, test.in1, test.in2, got, test.want)
+		}
+	}
+}
+
+func TestEqualSamples(t *testing.T) {
+	testSample := &Sample{}
+
+	tests := map[string]struct {
+		in1, in2 *Sample
+		want     bool
+	}{
+		"equal pointers": {
+			in1:  testSample,
+			in2:  testSample,
+			want: true,
+		},
+		"different metrics": {
+			in1:  &Sample{Metric: Metric{"foo": "bar"}},
+			in2:  &Sample{Metric: Metric{"foo": "biz"}},
+			want: false,
+		},
+		"different timestamp": {
+			in1:  &Sample{Timestamp: 0},
+			in2:  &Sample{Timestamp: 1},
+			want: false,
+		},
+		"different value": {
+			in1:  &Sample{Value: 0},
+			in2:  &Sample{Value: 1},
+			want: false,
+		},
+		"equal samples": {
+			in1: &Sample{
+				Metric:    Metric{"foo": "bar"},
+				Timestamp: 0,
+				Value:     1,
+			},
+			in2: &Sample{
+				Metric:    Metric{"foo": "bar"},
+				Timestamp: 0,
+				Value:     1,
+			},
+			want: true,
+		},
+	}
+
+	for name, test := range tests {
+		got := test.in1.Equal(test.in2)
+		if got != test.want {
+			t.Errorf("Comparing %s, %v and %v: got %t, want %t", name, test.in1, test.in2, got, test.want)
+		}
+	}
+
+}
+
+func TestSamplePairJSON(t *testing.T) {
+	input := []struct {
+		plain string
+		value SamplePair
+	}{
+		{
+			plain: `[1234.567,"123.1"]`,
+			value: SamplePair{
+				Value:     123.1,
+				Timestamp: 1234567,
+			},
+		},
+	}
+
+	for _, test := range input {
+		b, err := json.Marshal(test.value)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if string(b) != test.plain {
+			t.Errorf("encoding error: expected %q, got %q", test.plain, b)
+			continue
+		}
+
+		var sp SamplePair
+		err = json.Unmarshal(b, &sp)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if sp != test.value {
+			t.Errorf("decoding error: expected %v, got %v", test.value, sp)
+		}
+	}
+}
+
+func TestSampleJSON(t *testing.T) {
+	input := []struct {
+		plain string
+		value Sample
+	}{
+		{
+			plain: `{"metric":{"__name__":"test_metric"},"value":[1234.567,"123.1"]}`,
+			value: Sample{
+				Metric: Metric{
+					MetricNameLabel: "test_metric",
+				},
+				Value:     123.1,
+				Timestamp: 1234567,
+			},
+		},
+	}
+
+	for _, test := range input {
+		b, err := json.Marshal(test.value)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if string(b) != test.plain {
+			t.Errorf("encoding error: expected %q, got %q", test.plain, b)
+			continue
+		}
+
+		var sv Sample
+		err = json.Unmarshal(b, &sv)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if !reflect.DeepEqual(sv, test.value) {
+			t.Errorf("decoding error: expected %v, got %v", test.value, sv)
+		}
+	}
+}
+
+func TestVectorJSON(t *testing.T) {
+	input := []struct {
+		plain string
+		value Vector
+	}{
+		{
+			plain: `[]`,
+			value: Vector{},
+		},
+		{
+			plain: `[{"metric":{"__name__":"test_metric"},"value":[1234.567,"123.1"]}]`,
+			value: Vector{&Sample{
+				Metric: Metric{
+					MetricNameLabel: "test_metric",
+				},
+				Value:     123.1,
+				Timestamp: 1234567,
+			}},
+		},
+		{
+			plain: `[{"metric":{"__name__":"test_metric"},"value":[1234.567,"123.1"]},{"metric":{"foo":"bar"},"value":[1.234,"+Inf"]}]`,
+			value: Vector{
+				&Sample{
+					Metric: Metric{
+						MetricNameLabel: "test_metric",
+					},
+					Value:     123.1,
+					Timestamp: 1234567,
+				},
+				&Sample{
+					Metric: Metric{
+						"foo": "bar",
+					},
+					Value:     SampleValue(math.Inf(1)),
+					Timestamp: 1234,
+				},
+			},
+		},
+	}
+
+	for _, test := range input {
+		b, err := json.Marshal(test.value)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if string(b) != test.plain {
+			t.Errorf("encoding error: expected %q, got %q", test.plain, b)
+			continue
+		}
+
+		var vec Vector
+		err = json.Unmarshal(b, &vec)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if !reflect.DeepEqual(vec, test.value) {
+			t.Errorf("decoding error: expected %v, got %v", test.value, vec)
+		}
+	}
+}
+
+func TestScalarJSON(t *testing.T) {
+	input := []struct {
+		plain string
+		value Scalar
+	}{
+		{
+			plain: `[123.456,"456"]`,
+			value: Scalar{
+				Timestamp: 123456,
+				Value:     456,
+			},
+		},
+		{
+			plain: `[123123.456,"+Inf"]`,
+			value: Scalar{
+				Timestamp: 123123456,
+				Value:     SampleValue(math.Inf(1)),
+			},
+		},
+		{
+			plain: `[123123.456,"-Inf"]`,
+			value: Scalar{
+				Timestamp: 123123456,
+				Value:     SampleValue(math.Inf(-1)),
+			},
+		},
+	}
+
+	for _, test := range input {
+		b, err := json.Marshal(test.value)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if string(b) != test.plain {
+			t.Errorf("encoding error: expected %q, got %q", test.plain, b)
+			continue
+		}
+
+		var sv Scalar
+		err = json.Unmarshal(b, &sv)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if sv != test.value {
+			t.Errorf("decoding error: expected %v, got %v", test.value, sv)
+		}
+	}
+}
+
+func TestStringJSON(t *testing.T) {
+	input := []struct {
+		plain string
+		value String
+	}{
+		{
+			plain: `[123.456,"test"]`,
+			value: String{
+				Timestamp: 123456,
+				Value:     "test",
+			},
+		},
+		{
+			plain: `[123123.456,"台北"]`,
+			value: String{
+				Timestamp: 123123456,
+				Value:     "台北",
+			},
+		},
+	}
+
+	for _, test := range input {
+		b, err := json.Marshal(test.value)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if string(b) != test.plain {
+			t.Errorf("encoding error: expected %q, got %q", test.plain, b)
+			continue
+		}
+
+		var sv String
+		err = json.Unmarshal(b, &sv)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if sv != test.value {
+			t.Errorf("decoding error: expected %v, got %v", test.value, sv)
+		}
+	}
+}
+
+func TestVectorSort(t *testing.T) {
+	input := Vector{
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "A",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "A",
+			},
+			Timestamp: 2,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "C",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "C",
+			},
+			Timestamp: 2,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "B",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "B",
+			},
+			Timestamp: 2,
+		},
+	}
+
+	expected := Vector{
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "A",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "A",
+			},
+			Timestamp: 2,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "B",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "B",
+			},
+			Timestamp: 2,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "C",
+			},
+			Timestamp: 1,
+		},
+		&Sample{
+			Metric: Metric{
+				MetricNameLabel: "C",
+			},
+			Timestamp: 2,
+		},
+	}
+
+	sort.Sort(input)
+
+	for i, actual := range input {
+		actualFp := actual.Metric.Fingerprint()
+		expectedFp := expected[i].Metric.Fingerprint()
+
+		if actualFp != expectedFp {
+			t.Fatalf("%d. Incorrect fingerprint. Got %s; want %s", i, actualFp.String(), expectedFp.String())
+		}
+
+		if actual.Timestamp != expected[i].Timestamp {
+			t.Fatalf("%d. Incorrect timestamp. Got %s; want %s", i, actual.Timestamp, expected[i].Timestamp)
+		}
+	}
+}

gateway/vendor/github.com/prometheus/common/route/route.go

@@ -0,0 +1,100 @@
+package route
+
+import (
+	"net/http"
+
+	"github.com/julienschmidt/httprouter"
+	"golang.org/x/net/context"
+)
+
+type param string
+
+// Param returns param p for the context.
+func Param(ctx context.Context, p string) string {
+	return ctx.Value(param(p)).(string)
+}
+
+// WithParam returns a new context with param p set to v.
+func WithParam(ctx context.Context, p, v string) context.Context {
+	return context.WithValue(ctx, param(p), v)
+}
+
+// Router wraps httprouter.Router and adds support for prefixed sub-routers
+// and per-request context injections.
+type Router struct {
+	rtr    *httprouter.Router
+	prefix string
+}
+
+// New returns a new Router.
+func New() *Router {
+	return &Router{
+		rtr: httprouter.New(),
+	}
+}
+
+// WithPrefix returns a router that prefixes all registered routes with prefix.
+func (r *Router) WithPrefix(prefix string) *Router {
+	return &Router{rtr: r.rtr, prefix: r.prefix + prefix}
+}
+
+// handle turns a HandlerFunc into an httprouter.Handle.
+func (r *Router) handle(h http.HandlerFunc) httprouter.Handle {
+	return func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
+		ctx, cancel := context.WithCancel(req.Context())
+		defer cancel()
+
+		for _, p := range params {
+			ctx = context.WithValue(ctx, param(p.Key), p.Value)
+		}
+		h(w, req.WithContext(ctx))
+	}
+}
+
+// Get registers a new GET route.
+func (r *Router) Get(path string, h http.HandlerFunc) {
+	r.rtr.GET(r.prefix+path, r.handle(h))
+}
+
+// Options registers a new OPTIONS route.
+func (r *Router) Options(path string, h http.HandlerFunc) {
+	r.rtr.OPTIONS(r.prefix+path, r.handle(h))
+}
+
+// Del registers a new DELETE route.
+func (r *Router) Del(path string, h http.HandlerFunc) {
+	r.rtr.DELETE(r.prefix+path, r.handle(h))
+}
+
+// Put registers a new PUT route.
+func (r *Router) Put(path string, h http.HandlerFunc) {
+	r.rtr.PUT(r.prefix+path, r.handle(h))
+}
+
+// Post registers a new POST route.
+func (r *Router) Post(path string, h http.HandlerFunc) {
+	r.rtr.POST(r.prefix+path, r.handle(h))
+}
+
+// Redirect takes an absolute path and sends an internal HTTP redirect for it,
+// prefixed by the router's path prefix. Note that this method does not include
+// functionality for handling relative paths or full URL redirects.
+func (r *Router) Redirect(w http.ResponseWriter, req *http.Request, path string, code int) {
+	http.Redirect(w, req, r.prefix+path, code)
+}
+
+// ServeHTTP implements http.Handler.
+func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	r.rtr.ServeHTTP(w, req)
+}
+
+// FileServe returns a new http.HandlerFunc that serves files from dir.
+// Using routes must provide the *filepath parameter.
+func FileServe(dir string) http.HandlerFunc {
+	fs := http.FileServer(http.Dir(dir))
+
+	return func(w http.ResponseWriter, r *http.Request) {
+		r.URL.Path = Param(r.Context(), "filepath")
+		fs.ServeHTTP(w, r)
+	}
+}

gateway/vendor/github.com/prometheus/common/route/route_test.go

@@ -0,0 +1,44 @@
+package route
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestRedirect(t *testing.T) {
+	router := New().WithPrefix("/test/prefix")
+	w := httptest.NewRecorder()
+	r, err := http.NewRequest("GET", "http://localhost:9090/foo", nil)
+	if err != nil {
+		t.Fatalf("Error building test request: %s", err)
+	}
+
+	router.Redirect(w, r, "/some/endpoint", http.StatusFound)
+	if w.Code != http.StatusFound {
+		t.Fatalf("Unexpected redirect status code: got %d, want %d", w.Code, http.StatusFound)
+	}
+
+	want := "/test/prefix/some/endpoint"
+	got := w.Header()["Location"][0]
+	if want != got {
+		t.Fatalf("Unexpected redirect location: got %s, want %s", got, want)
+	}
+}
+
+func TestContext(t *testing.T) {
+	router := New()
+	router.Get("/test/:foo/", func(w http.ResponseWriter, r *http.Request) {
+		want := "bar"
+		got := Param(r.Context(), "foo")
+		if want != got {
+			t.Fatalf("Unexpected context value: want %q, got %q", want, got)
+		}
+	})
+
+	r, err := http.NewRequest("GET", "http://localhost:9090/test/bar/", nil)
+	if err != nil {
+		t.Fatalf("Error building test request: %s", err)
+	}
+	router.ServeHTTP(nil, r)
+}

gateway/vendor/github.com/prometheus/common/version/info.go

@@ -0,0 +1,89 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package version
+
+import (
+	"bytes"
+	"fmt"
+	"runtime"
+	"strings"
+	"text/template"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Build information. Populated at build-time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+	GoVersion = runtime.Version()
+)
+
+// NewCollector returns a collector which exports metrics about current version information.
+func NewCollector(program string) *prometheus.GaugeVec {
+	buildInfo := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: program,
+			Name:      "build_info",
+			Help: fmt.Sprintf(
+				"A metric with a constant '1' value labeled by version, revision, branch, and goversion from which %s was built.",
+				program,
+			),
+		},
+		[]string{"version", "revision", "branch", "goversion"},
+	)
+	buildInfo.WithLabelValues(Version, Revision, Branch, GoVersion).Set(1)
+	return buildInfo
+}
+
+// versionInfoTmpl contains the template used by Info.
+var versionInfoTmpl = `
+{{.program}}, version {{.version}} (branch: {{.branch}}, revision: {{.revision}})
+  build user:       {{.buildUser}}
+  build date:       {{.buildDate}}
+  go version:       {{.goVersion}}
+`
+
+// Print returns version information.
+func Print(program string) string {
+	m := map[string]string{
+		"program":   program,
+		"version":   Version,
+		"revision":  Revision,
+		"branch":    Branch,
+		"buildUser": BuildUser,
+		"buildDate": BuildDate,
+		"goVersion": GoVersion,
+	}
+	t := template.Must(template.New("version").Parse(versionInfoTmpl))
+
+	var buf bytes.Buffer
+	if err := t.ExecuteTemplate(&buf, "version", m); err != nil {
+		panic(err)
+	}
+	return strings.TrimSpace(buf.String())
+}
+
+// Info returns version, branch and revision information.
+func Info() string {
+	return fmt.Sprintf("(version=%s, branch=%s, revision=%s)", Version, Branch, Revision)
+}
+
+// BuildContext returns goVersion, buildUser and buildDate information.
+func BuildContext() string {
+	return fmt.Sprintf("(go=%s, user=%s, date=%s)", GoVersion, BuildUser, BuildDate)
+}