bugfix: exit when recive signals(sigint/sighup)

alibaba · May 16, 2024 · cb09e8c · cb09e8c
1 parent 621803d
commit cb09e8c
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Showing 4 changed files with 79 additions and 75 deletions.
diff --git a/pkg/exporter/cmd/eventserver.go b/pkg/exporter/cmd/eventserver.go
@@ -12,7 +12,7 @@ type EventServer struct {
 	*DynamicProbeServer[probe.EventProbe]
 }
 
-func NewEventServer(sinks []sink.Sink) (*EventServer, error) {
+func newEventServer(sinks []sink.Sink) (*EventServer, error) {
 	var sinkWrappers []*sinkWrapper
 
 	done := make(chan struct{})

diff --git a/pkg/exporter/cmd/metricserver.go b/pkg/exporter/cmd/metricserver.go
@@ -11,7 +11,7 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-func NewMetricsServer() (*MetricsServer, error) {
+func newMetricsServer() (*MetricsServer, error) {
 
 	r := prometheus.NewRegistry()
 	handler := promhttp.HandlerFor(prometheus.Gatherers{

diff --git a/pkg/exporter/cmd/server.go b/pkg/exporter/cmd/server.go
@@ -280,90 +280,93 @@ func (i *inspServer) reload() error {
 	return nil
 }
 
+func (i *inspServer) newHTTPServer(cfg *InspServerConfig) *http.Server {
+	http.Handle("/metrics", i.metricsServer)
+	http.Handle("/", http.HandlerFunc(defaultPage))
+	http.Handle("/status", http.HandlerFunc(i.statusPage))
+	if cfg.DebugMode {
+		reg := prometheus.NewRegistry()
+
+		reg.MustRegister(
+			collectors.NewGoCollector(),
+			collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+		)
+		http.Handle("/internal", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
+	}
+	listenAddr := fmt.Sprintf(":%d", cfg.Port)
+	log.Infof("inspector start metric server, listenAddr: %s", listenAddr)
+	return &http.Server{Addr: listenAddr}
+}
+
 func (i *inspServer) start(cfg *InspServerConfig) error {
 	if err := gops.Listen(gops.Options{}); err != nil {
 		log.Infof("start gops err: %v", err)
 	}
 
-	go func() {
-		var err error
-		ctx := context.TODO()
-
-		err = probe.InitAdditionalLabels(cfg.MetricsConfig.AdditionalLabels)
-		if err != nil {
-			log.Errorf("failed init additional labels: %v", err)
-			return
-		}
-
-		log.Infof("start metrics server")
-		i.metricsServer, err = NewMetricsServer()
-		if err != nil {
-			log.Errorf("failed create metrics server: %v", err)
-			return
-		}
+	var err error
+	ctx := context.TODO()
+	err = probe.InitAdditionalLabels(cfg.MetricsConfig.AdditionalLabels)
+	if err != nil {
+		return fmt.Errorf("failed init additional labels: %w", err)
+	}
 
-		defer func() {
-			_ = i.metricsServer.Stop(ctx)
-		}()
+	i.metricsServer, err = newMetricsServer()
+	if err != nil {
+		return fmt.Errorf("failed create metrics server: %w", err)
+	}
 
-		if err := i.metricsServer.Start(ctx, cfg.MetricsConfig.Probes); err != nil {
-			log.Errorf("failed start metrics server: %v", err)
-			return
-		}
+	if err := i.metricsServer.Start(ctx, cfg.MetricsConfig.Probes); err != nil {
+		return fmt.Errorf("failed start metrics server: %w", err)
+	}
 
-		//sink
-		sinks, err := createSink(cfg.EventConfig.EventSinks)
-		if err != nil {
-			log.Errorf("failed create sinks, err: %v", err)
-		} else if len(sinks) != len(cfg.EventConfig.EventSinks) {
-			log.Warnf("expected to create %d sinks , but %d were created", len(cfg.EventConfig.EventSinks), len(sinks))
-		}
+	defer func() {
+		_ = i.metricsServer.Stop(ctx)
+	}()
 
-		log.Infof("start event server")
-		i.eventServer, err = NewEventServer(sinks)
-		if err != nil {
-			log.Errorf("failed create event server: %v", err)
-			return
-		}
+	sinks, err := createSink(cfg.EventConfig.EventSinks)
+	if err != nil {
+		return fmt.Errorf("failed create sinks, err: %w", err)
+	}
+	if len(sinks) != len(cfg.EventConfig.EventSinks) {
+		log.Warnf("expected to create %d sinks , but %d were created", len(cfg.EventConfig.EventSinks), len(sinks))
+	}
 
-		defer func() {
-			_ = i.eventServer.Stop(context.TODO())
-		}()
+	i.eventServer, err = newEventServer(sinks)
+	if err != nil {
+		return fmt.Errorf("failed create event server: %w", err)
+	}
 
-		if err := i.eventServer.Start(ctx, cfg.EventConfig.Probes); err != nil {
-			log.Errorf("failed start event server: %v", err)
-			return
-		}
+	if err = i.eventServer.Start(ctx, cfg.EventConfig.Probes); err != nil {
+		return fmt.Errorf("failed start event server: %w", err)
+	}
 
-		http.Handle("/metrics", i.metricsServer)
-		http.Handle("/", http.HandlerFunc(defaultPage))
-		http.Handle("/status", http.HandlerFunc(i.statusPage))
-		if cfg.DebugMode {
-			reg := prometheus.NewRegistry()
-
-			reg.MustRegister(
-				collectors.NewGoCollector(),
-				collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
-			)
-			http.Handle("/internal", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
-		}
-		listenAddr := fmt.Sprintf(":%d", cfg.Port)
-		log.Infof("inspector start metric server, listenAddr: %s", listenAddr)
-		srv := &http.Server{Addr: listenAddr}
-		if err := srv.ListenAndServe(); err != nil {
-			log.Errorf("inspector start metric server err: %v", err)
-		}
+	defer func() {
+		_ = i.eventServer.Stop(ctx)
 	}()
 
 	done := make(chan struct{})
 
-	if err := i.WatchConfig(done); err != nil {
+	if err = i.WatchConfig(done); err != nil {
 		log.Errorf("failed watch config, dynamic load would not work: %v", err)
 	}
 
-	WaitSignals(i, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
-	close(done)
+	srv := i.newHTTPServer(cfg)
+	serverClosedChan := make(chan struct{})
+	serverClosed := false
+	go func() {
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			log.Errorf("server error: %v", err)
+		}
 
+		close(serverClosedChan)
+		serverClosed = true
+	}()
+
+	WaitSignals(serverClosedChan, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
+	close(done)
+	if !serverClosed {
+		_ = srv.Shutdown(ctx)
+	}
 	return nil
 }
 
@@ -380,16 +383,15 @@ func createSink(sinkConfigs []EventSinkConfig) ([]sink.Sink, error) {
 	return ret, nil
 }
 
-func WaitSignals(i *inspServer, sgs ...os.Signal) {
+func WaitSignals(done <-chan struct{}, sgs ...os.Signal) {
 	s := make(chan os.Signal, 1)
 	signal.Notify(s, sgs...)
-	sig := <-s
-	log.Warnf("recive signal %s, stopping", sig.String())
-	if err := i.metricsServer.Stop(i.ctx); err != nil {
-		log.Errorf("failed stop metrics server, err: %v", err)
-	}
-	if err := i.eventServer.Stop(i.ctx); err != nil {
-		log.Errorf("failed stop event server, err: %v", err)
+	select {
+	case sig := <-s:
+		log.Warnf("recive signal %s, stopping", sig.String())
+		return
+	case <-done:
+		log.Warnf("recive server close signal")
 	}
 }
 

diff --git a/pkg/exporter/nettop/cache.go b/pkg/exporter/nettop/cache.go
@@ -240,7 +240,7 @@ func StartCache(ctx context.Context, sidecarMode bool) error {
 }
 
 func StopCache() {
-	control <- struct{}{}
+	close(control)
 }
 
 func cacheDaemonLoop(_ context.Context, control chan struct{}) {
@@ -249,10 +249,12 @@ func cacheDaemonLoop(_ context.Context, control chan struct{}) {
 	t := time.NewTicker(cacheUpdateInterval)
 	defer t.Stop()
 
+loop:
 	for {
 		select {
 		case <-control:
 			log.Info("cache daemon loop exit of control signal")
+			break loop
 		case <-t.C:
 			if err := cachePodsWithTimeout(cacheUpdateInterval); err != nil {
 				log.Errorf("failed cache pods: %v", err)