dump cpu/mem profile into file on signal SIGUSR1/SIGUSR2 (#3262)

Signed-off-by: 张祖建 <zhangzujian.7@gmail.com>

cmd/cmdmain.go

@@ -1,8 +1,15 @@
 package main
 
 import (
+	"fmt"
 	"os"
+	"os/signal"
 	"path/filepath"
+	"runtime/pprof"
+	"syscall"
+	"time"
+
+	"k8s.io/klog/v2"
 
 	"github.com/kubeovn/kube-ovn/cmd/controller"
 	"github.com/kubeovn/kube-ovn/cmd/controller_health_check"
@@ -24,18 +31,65 @@ const (
 	CmdOvnLeaderChecker      = "kube-ovn-leader-checker"
 )
 
+const timeFormat = "2006-01-02_15:04:05"
+
+func dumpProfile() {
+	ch1 := make(chan os.Signal, 1)
+	ch2 := make(chan os.Signal, 1)
+	signal.Notify(ch1, syscall.SIGUSR1)
+	signal.Notify(ch2, syscall.SIGUSR2)
+	go func() {
+		for {
+			<-ch1
+			name := fmt.Sprintf("cpu-profile-%s.pprof", time.Now().Format(timeFormat))
+			f, err := os.Create(filepath.Join(os.TempDir(), name)) // #nosec G303,G304
+			if err != nil {
+				klog.Errorf("failed to create cpu profile file: %v", err)
+				return
+			}
+			defer f.Close()
+			if err = pprof.StartCPUProfile(f); err != nil {
+				klog.Errorf("failed to start cpu profile: %v", err)
+				return
+			}
+			time.Sleep(30 * time.Second)
+			pprof.StopCPUProfile()
+		}
+	}()
+	go func() {
+		for {
+			<-ch2
+			name := fmt.Sprintf("mem-profile-%s.pprof", time.Now().Format(timeFormat))
+			f, err := os.Create(filepath.Join(os.TempDir(), name)) // #nosec G303,G304
+			if err != nil {
+				klog.Errorf("failed to create memory profile file: %v", err)
+				return
+			}
+			defer f.Close()
+			if err = pprof.WriteHeapProfile(f); err != nil {
+				klog.Errorf("failed to write memory profile file: %v", err)
+			}
+		}
+	}()
+}
+
 func main() {
 	cmd := filepath.Base(os.Args[0])
 	switch cmd {
 	case CmdController:
+		dumpProfile()
 		controller.CmdMain()
 	case CmdDaemon:
+		dumpProfile()
 		daemon.CmdMain()
 	case CmdMonitor:
+		dumpProfile()
 		ovn_monitor.CmdMain()
 	case CmdPinger:
+		dumpProfile()
 		pinger.CmdMain()
 	case CmdSpeaker:
+		dumpProfile()
 		speaker.CmdMain()
 	case CmdControllerHealthCheck:
 		controller_health_check.CmdMain()