add signals based on controller-runtime signals handler

signals/signal_test.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2018 The Kubernetes 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 signals
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSignalsHandler(t *testing.T) {
+	ctx := SetupSignalHandler()
+	task := &Task{
+		ticker: time.NewTicker(time.Second * 2),
+	}
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+	task.wg.Add(1)
+	go func(c chan os.Signal) {
+		defer task.wg.Done()
+		task.Run(c)
+	}(c)
+
+	select {
+	case sig := <-c:
+		fmt.Printf("Got %s signal. Aborting...\n", sig)
+	case _, ok := <-ctx.Done():
+		assert.False(t, ok)
+	}
+}
+
+type Task struct {
+	wg     sync.WaitGroup
+	ticker *time.Ticker
+}
+
+func (t *Task) Run(c chan os.Signal) {
+	for {
+		go sendSignal(c)
+		handle()
+	}
+}
+
+func handle() {
+	for i := 0; i < 5; i++ {
+		fmt.Print("#")
+		time.Sleep(time.Millisecond * 100)
+	}
+	fmt.Println()
+}
+
+func sendSignal(stopChan chan os.Signal) {
+	fmt.Printf("...")
+	time.Sleep(1 * time.Second)
+	stopChan <- os.Interrupt
+}