Move packages to proejct/pkg to follow go project folder structure convention (#1190)

pkg/router/mutablemux_test.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2016 The Fission 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 router
+
+import (
+	"log"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/gorilla/mux"
+	"go.uber.org/zap"
+)
+
+func OldHandler(responseWriter http.ResponseWriter, request *http.Request) {
+	responseWriter.Write([]byte("old handler"))
+}
+func NewHandler(responseWriter http.ResponseWriter, request *http.Request) {
+	responseWriter.Write([]byte("new handler"))
+}
+
+func verifyRequest(expectedResponse string) {
+	targetUrl := "http://localhost:3333"
+	testRequest(targetUrl, expectedResponse)
+}
+
+func startServer(mr *mutableRouter) {
+	http.ListenAndServe(":3333", mr)
+}
+
+func spamServer(quit chan bool) {
+	i := 0
+	for {
+		select {
+		case <-quit:
+			break
+		default:
+			i = i + 1
+			resp, err := http.Get("http://localhost:3333")
+			if err != nil {
+				log.Panicf("failed to make get request %v: %v", i, err)
+			}
+			resp.Body.Close()
+		}
+	}
+}
+
+func TestMutableMux(t *testing.T) {
+	// make a simple mutable router
+	log.Print("Create mutable router")
+	muxRouter := mux.NewRouter()
+	muxRouter.HandleFunc("/", OldHandler)
+	logger, err := zap.NewDevelopment()
+	panicIf(err)
+
+	mr := NewMutableRouter(logger, muxRouter)
+
+	// start http server
+	log.Print("Start http server")
+	go startServer(mr)
+
+	// continuously make requests, panic if any fails
+	time.Sleep(100 * time.Millisecond)
+	q := make(chan bool)
+	go spamServer(q)
+
+	time.Sleep(5 * time.Millisecond)
+
+	// connect and verify old handler
+	log.Print("Verify old handler")
+	verifyRequest("old handler")
+
+	// change the muxer
+	log.Print("Change mux router")
+	newMuxRouter := mux.NewRouter()
+	newMuxRouter.HandleFunc("/", NewHandler)
+	mr.updateRouter(newMuxRouter)
+
+	// connect and verify the new handler
+	log.Print("Verify new handler")
+	verifyRequest("new handler")
+
+	q <- true
+	time.Sleep(100 * time.Millisecond)
+}