initial import

example/signal/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"path"
+	"runtime/pprof"
+	"syscall"
+	"time"
+
+	"zero/core/cmdline"
+	"zero/core/logx"
+)
+
+const (
+	goroutineProfile = "goroutine"
+	debugLevel       = 2
+	timeFormat       = "0102150405"
+)
+
+func init() {
+	go func() {
+		// https://golang.org/pkg/os/signal/#Notify
+		signals := make(chan os.Signal, 1)
+		signal.Notify(signals, syscall.SIGUSR1, syscall.SIGTERM)
+
+		for {
+			v := <-signals
+			switch v {
+			case syscall.SIGUSR1:
+				dumpGoroutines()
+			case syscall.SIGTERM:
+				gracefulStop(signals)
+			default:
+				logx.Error("Got unregistered signal:", v)
+			}
+		}
+	}()
+}
+
+func dumpGoroutines() {
+	command := path.Base(os.Args[0])
+	pid := syscall.Getpid()
+	dumpFile := path.Join(os.TempDir(), fmt.Sprintf("%s-%d-goroutines-%s.dump",
+		command, pid, time.Now().Format(timeFormat)))
+
+	logx.Infof("Got dump goroutine signal, printing goroutine profile to %s", dumpFile)
+
+	if f, err := os.Create(dumpFile); err != nil {
+		logx.Errorf("Failed to dump goroutine profile, error: %v", err)
+	} else {
+		defer f.Close()
+		pprof.Lookup(goroutineProfile).WriteTo(f, debugLevel)
+	}
+}
+
+func gracefulStop(signals chan os.Signal) {
+	signal.Stop(signals)
+
+	logx.Info("Got signal SIGTERM, shutting down...")
+
+	time.Sleep(time.Second * 5)
+	logx.Infof("Still alive after %v, going to force kill the process...", time.Second*5)
+	syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
+}
+
+func main() {
+	cmdline.EnterToContinue()
+}