mirror of
https://github.com/openfaas/faas.git
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89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
// Copyright (c) Alex Ellis 2017. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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package handlers
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"strings"
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"github.com/alexellis/faas/gateway/metrics"
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"github.com/alexellis/faas/gateway/requests"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/client"
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"github.com/prometheus/client_golang/prometheus"
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io_prometheus_client "github.com/prometheus/client_model/go"
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)
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// MakeFunctionReader gives a summary of Function structs with Docker service stats overlaid with Prometheus counters.
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func MakeFunctionReader(metricsOptions metrics.MetricOptions, c *client.Client) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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serviceFilter := filters.NewArgs()
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options := types.ServiceListOptions{
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Filters: serviceFilter,
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}
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services, err := c.ServiceList(context.Background(), options)
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if err != nil {
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fmt.Println(err)
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}
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// TODO: Filter only "faas" functions (via metadata?)
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var functions []requests.Function
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for _, service := range services {
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if len(service.Spec.TaskTemplate.ContainerSpec.Labels["function"]) > 0 {
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invocations := getCounterValue(service.Spec.Name, "200", &metricsOptions) +
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getCounterValue(service.Spec.Name, "500", &metricsOptions)
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var envProcess string
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for _, env := range service.Spec.TaskTemplate.ContainerSpec.Env {
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if strings.Index(env, "fprocess=") > -1 {
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envProcess = env[len("fprocess="):]
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}
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}
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f := requests.Function{
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Name: service.Spec.Name,
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Image: service.Spec.TaskTemplate.ContainerSpec.Image,
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InvocationCount: invocations,
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Replicas: *service.Spec.Mode.Replicated.Replicas,
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EnvProcess: envProcess,
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}
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functions = append(functions, f)
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}
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}
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functionBytes, _ := json.Marshal(functions)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(200)
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w.Write(functionBytes)
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}
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}
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func getCounterValue(service string, code string, metricsOptions *metrics.MetricOptions) float64 {
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metric, err := metricsOptions.GatewayFunctionInvocation.
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GetMetricWith(prometheus.Labels{"function_name": service, "code": code})
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if err != nil {
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return 0
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}
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// Get the metric's value from ProtoBuf interface (idea via Julius Volz)
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var protoMetric io_prometheus_client.Metric
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metric.Write(&protoMetric)
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invocations := protoMetric.GetCounter().GetValue()
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return invocations
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}
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