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118 lines
2.6 KiB
Go
118 lines
2.6 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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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"net/url"
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"strings"
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"github.com/gorilla/mux"
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"github.com/openfaas/faas/gateway/metrics"
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"github.com/openfaas/faas/gateway/queue"
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"github.com/openfaas/faas/gateway/scaling"
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)
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const queueAnnotation = "com.openfaas.queue"
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// MakeQueuedProxy accepts work onto a queue
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func MakeQueuedProxy(metrics metrics.MetricOptions, queuer queue.RequestQueuer, pathTransformer URLPathTransformer, defaultNS string, functionQuery scaling.FunctionQuery) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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if r.Body != nil {
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defer r.Body.Close()
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}
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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callbackURL, err := getCallbackURLHeader(r.Header)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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vars := mux.Vars(r)
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name := vars["name"]
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queueName, err := getQueueName(name, functionQuery)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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req := &queue.Request{
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Function: name,
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Body: body,
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Method: r.Method,
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QueryString: r.URL.RawQuery,
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Path: pathTransformer.Transform(r),
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Header: r.Header,
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Host: r.Host,
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CallbackURL: callbackURL,
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QueueName: queueName,
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}
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if len(queueName) > 0 {
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log.Printf("Queueing %s to: %s\n", name, queueName)
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}
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if err = queuer.Queue(req); err != nil {
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fmt.Printf("Queue error: %v\n", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusAccepted)
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}
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}
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func getCallbackURLHeader(header http.Header) (*url.URL, error) {
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value := header.Get("X-Callback-Url")
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var callbackURL *url.URL
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if len(value) > 0 {
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urlVal, err := url.Parse(value)
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if err != nil {
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return callbackURL, err
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}
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callbackURL = urlVal
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}
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return callbackURL, nil
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}
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func getQueueName(name string, fnQuery scaling.FunctionQuery) (queueName string, err error) {
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fn, ns := getNameParts(name)
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annotations, err := fnQuery.GetAnnotations(fn, ns)
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if err != nil {
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return "", err
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}
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queueName = ""
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if v := annotations[queueAnnotation]; len(v) > 0 {
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queueName = v
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}
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return queueName, err
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}
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func getNameParts(name string) (fn, ns string) {
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fn = name
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ns = ""
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if index := strings.LastIndex(name, "."); index > 0 {
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fn = name[:index]
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ns = name[index+1:]
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}
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return fn, ns
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}
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