xiekeyangandSoam Vasani
3707b95edb
The Round Tripper parameters of timeout, keep alive time and Max retry times is configured in router system environment. And they are set to Round Tripper when router service initializing. This setup new nested structure `tsRoundTripperParams` to transfer them.
139 lines
3.9 KiB
Go
139 lines
3.9 KiB
Go
/*
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Copyright 2016 The Fission Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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This is the Fission Router package.
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Its job is to:
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1. Keep track of HTTP triggers and their mappings to functions
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Use the controller API to get and watch this state.
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2. Given a function, get a reference to a routable function run service
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Use the ContainerPoolManager API to get a service backed by one
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or more function run containers. The container(s) backing the
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service may be newly created, or they might be reused. The only
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requirement is that one or more containers backs the service.
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3. Forward the request to the service, and send the response back.
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Plain ol HTTP.
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*/
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package router
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import (
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"context"
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"fmt"
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"log"
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"net/http"
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"os"
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"strconv"
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"time"
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"github.com/gorilla/mux"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/fission/fission"
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"github.com/fission/fission/crd"
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executorClient "github.com/fission/fission/executor/client"
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)
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// request url ---[mux]---> Function(name,uid) ----[fmap]----> k8s service url
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// request url ---[trigger]---> Function(name, deployment) ----[deployment]----> Function(name, uid) ----[pool mgr]---> k8s service url
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func router(ctx context.Context, httpTriggerSet *HTTPTriggerSet, resolver *functionReferenceResolver) *mutableRouter {
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muxRouter := mux.NewRouter()
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mr := NewMutableRouter(muxRouter)
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muxRouter.Use(fission.LoggingMiddleware)
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httpTriggerSet.subscribeRouter(ctx, mr, resolver)
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return mr
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}
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func serve(ctx context.Context, port int, httpTriggerSet *HTTPTriggerSet, resolver *functionReferenceResolver) {
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mr := router(ctx, httpTriggerSet, resolver)
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url := fmt.Sprintf(":%v", port)
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http.ListenAndServe(url, mr)
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}
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func serveMetric() {
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// Expose the registered metrics via HTTP.
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http.Handle("/metrics", promhttp.Handler())
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log.Fatal(http.ListenAndServe(metricAddr, nil))
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}
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func Start(port int, executorUrl string) {
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// setup a signal handler for SIGTERM
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fission.SetupStackTraceHandler()
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fmap := makeFunctionServiceMap(time.Minute)
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fissionClient, kubeClient, _, err := crd.MakeFissionClient()
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if err != nil {
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log.Fatalf("Error connecting to kubernetes API: %v", err)
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}
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err = fissionClient.WaitForCRDs()
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if err != nil {
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log.Fatalf("Error waiting for CRDs: %v", err)
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}
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restClient := fissionClient.GetCrdClient()
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executor := executorClient.MakeClient(executorUrl)
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timeout, err := time.ParseDuration(os.Getenv("ROUTER_ROUND_TRIP_TIMEOUT"))
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if err != nil {
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log.Fatalf("Failed to parse timeout: %v", err)
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}
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timeoutExponent, err := strconv.Atoi(os.Getenv("ROUTER_ROUNDTRIP_TIMEOUT_EXPONENT"))
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if err != nil {
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log.Fatalf("Failed to parse timeout exponent: %v", err)
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}
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keepAlive, err := time.ParseDuration(os.Getenv("ROUTER_ROUND_TRIP_KEEP_ALIVE_TIME"))
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if err != nil {
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log.Fatalf("Failed to parse keep alive time: %v", err)
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}
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maxRetries, err := strconv.Atoi(os.Getenv("ROUTER_ROUND_TRIP_MAX_RETRIES"))
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if err != nil {
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log.Fatalf("Failed to parse max retry times: %v", err)
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}
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triggers, _, fnStore := makeHTTPTriggerSet(fmap, fissionClient, kubeClient, executor, restClient,
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&tsRoundTripperParams{
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timeout: timeout,
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timeoutExponent: timeoutExponent,
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keepAlive: keepAlive,
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maxRetries: maxRetries,
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})
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resolver := makeFunctionReferenceResolver(fnStore)
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go serveMetric()
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log.Printf("Starting router at port %v\n", port)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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serve(ctx, port, triggers, resolver)
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}
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