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https://github.com/openfaas/faas.git
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2bfca6d848
Enables publishing to various topics according to annotations on the functions. The function cache is moved up one level so that it can be shared between the scale from zero code and the queue proxy. Unit tests added for new internal methods. Tested e2e with arkade and the newest queue-worker and RC gateway image with two queues and an annotation on one of the functions of com.openfaas.queue. It worked as expected including with multiple namespace support. Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
120 lines
2.7 KiB
Go
120 lines
2.7 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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// MakeQueuedProxy accepts work onto a queue
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func MakeQueuedProxy(metrics metrics.MetricOptions, wildcard bool, queuer queue.RequestQueuer, pathTransformer URLPathTransformer, defaultNS string, functionCacher scaling.FunctionCacher, serviceQuery scaling.ServiceQuery) 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, functionCacher, serviceQuery)
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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 getQueueName(name string, cache scaling.FunctionCacher, serviceQuery scaling.ServiceQuery) (queueName string, err error) {
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fn, ns := getNameParts(name)
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query, hit := cache.Get(fn, ns)
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if !hit {
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queryResponse, err := serviceQuery.GetReplicas(fn, ns)
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if err != nil {
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return "", err
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}
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cache.Set(fn, ns, queryResponse)
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}
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query, _ = cache.Get(fn, ns)
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queueName = ""
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if query.Annotations != nil {
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if v := (*query.Annotations)["com.openfaas.queue"]; len(v) > 0 {
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queueName = v
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}
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}
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return queueName, err
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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 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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