fix: startup order

internal/grpc/client/client.go

@@ -42,6 +42,7 @@ type Client struct {
 	slugService                proto.SlugChangeClient
 	eventService               proto.EventServiceClient
 	authorizeConnectionService proto.UserServiceClient
+	closing                    bool
 }
 
 func DefaultConfig() *GrpcConfig {
@@ -155,16 +156,17 @@ func (c *Client) SubscribeEvents(ctx context.Context, identity, authToken string
 	for {
 		subscribe, err := c.eventService.Subscribe(ctx)
 		if err != nil {
-			if !isConnectionError(err) {
+			if errors.Is(err, context.Canceled) || status.Code(err) == codes.Canceled || ctx.Err() != nil {
 				return err
 			}
-			if status.Code(err) == codes.Unauthenticated {
+			if !c.isConnectionError(err) || status.Code(err) == codes.Unauthenticated {
 				return err
 			}
-			if err := wait(); err != nil {
+			if err = wait(); err != nil {
 				return err
 			}
 			growBackoff()
+			log.Printf("Reconnect to controller within %v sec", backoff.Seconds())
 			continue
 		}
 
@@ -180,8 +182,8 @@ func (c *Client) SubscribeEvents(ctx context.Context, identity, authToken string
 
 		if err != nil {
 			log.Println("Authentication failed to send to gRPC server:", err)
-			if isConnectionError(err) {
+			if c.isConnectionError(err) {
-				if err := wait(); err != nil {
+				if err = wait(); err != nil {
 					return err
 				}
 				growBackoff()
@@ -193,9 +195,13 @@ func (c *Client) SubscribeEvents(ctx context.Context, identity, authToken string
 		backoff = baseBackoff
 
 		if err = c.processEventStream(subscribe); err != nil {
-			if isConnectionError(err) {
+			if errors.Is(err, context.Canceled) || status.Code(err) == codes.Canceled || ctx.Err() != nil {
+				return err
+			}
+			if c.isConnectionError(err) {
 				log.Printf("Reconnect to controller within %v sec", backoff.Seconds())
-				if err := wait(); err != nil {
+				if err = wait(); err != nil {
+					fmt.Println(err)
 					return err
 				}
 				growBackoff()
@@ -210,16 +216,7 @@ func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Nod
 	for {
 		recv, err := subscribe.Recv()
 		if err != nil {
-			if isConnectionError(err) {
+			return err
-				log.Printf("connection error receiving from gRPC server: %v", err)
-				return err
-			}
-			if status.Code(err) == codes.Unauthenticated {
-				log.Printf("Authentication failed: %v", err)
-				return err
-			}
-			log.Printf("non-connection receive error from gRPC server: %v", err)
-			continue
 		}
 		switch recv.GetType() {
 		case proto.EventType_SLUG_CHANGE:
@@ -237,8 +234,7 @@ func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Nod
 					},
 				})
 				if errSend != nil {
-					if isConnectionError(errSend) {
+					if c.isConnectionError(errSend) {
-						log.Printf("connection error sending slug change failure: %v", errSend)
 						return errSend
 					}
 					log.Printf("non-connection send error for slug change failure: %v", errSend)
@@ -257,8 +253,7 @@ func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Nod
 					},
 				})
 				if errSend != nil {
-					if isConnectionError(errSend) {
+					if c.isConnectionError(errSend) {
-						log.Printf("connection error sending slug change failure: %v", errSend)
 						return errSend
 					}
 					log.Printf("non-connection send error for slug change failure: %v", errSend)
@@ -276,7 +271,7 @@ func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Nod
 				},
 			})
 			if err != nil {
-				if isConnectionError(err) {
+				if c.isConnectionError(err) {
 					log.Printf("connection error sending slug change success: %v", err)
 					return err
 				}
@@ -306,7 +301,7 @@ func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Nod
 				},
 			})
 			if err != nil {
-				if isConnectionError(err) {
+				if c.isConnectionError(err) {
 					log.Printf("connection error sending sessions success: %v", err)
 					return err
 				}
@@ -338,6 +333,7 @@ func (c *Client) AuthorizeConn(ctx context.Context, token string) (authorized bo
 func (c *Client) Close() error {
 	if c.conn != nil {
 		log.Printf("Closing gRPC connection to %s", c.config.Address)
+		c.closing = true
 		return c.conn.Close()
 	}
 	return nil
@@ -361,7 +357,10 @@ func (c *Client) GetConfig() *GrpcConfig {
 	return c.config
 }
 
-func isConnectionError(err error) bool {
+func (c *Client) isConnectionError(err error) bool {
+	if c.closing {
+		return false
+	}
 	if err == nil {
 		return false
 	}

main.go

@@ -7,7 +7,9 @@ import (
 	"net/http"
 	_ "net/http/pprof"
 	"os"
+	"os/signal"
 	"strings"
+	"syscall"
 	"time"
 	"tunnel_pls/internal/config"
 	"tunnel_pls/internal/grpc/client"
@@ -68,10 +70,14 @@ func main() {
 	sshConfig.AddHostKey(private)
 	sessionRegistry := session.NewRegistry()
 
-	var grpcClient *client.Client
+	ctx, cancel := context.WithCancel(context.Background())
-	var cancel context.CancelFunc = func() {}
+	defer cancel()
-	var ctx context.Context = context.Background()
 
+	errChan := make(chan error, 2)
+	shutdownChan := make(chan os.Signal, 1)
+	signal.Notify(shutdownChan, os.Interrupt, syscall.SIGTERM)
+
+	var grpcClient *client.Client
 	if isNodeMode {
 		grpcHost := config.Getenv("GRPC_ADDRESS", "localhost")
 		grpcPort := config.Getenv("GRPC_PORT", "8080")
@@ -79,10 +85,9 @@ func main() {
 		nodeToken := config.Getenv("NODE_TOKEN", "")
 		if nodeToken == "" {
 			log.Fatalf("NODE_TOKEN is required in node mode")
-			return
 		}
-		
+
-		grpcClient, err = client.New(&client.GrpcConfig{
+		c, err := client.New(&client.GrpcConfig{
 			Address:            grpcAddr,
 			UseTLS:             false,
 			InsecureSkipVerify: false,
@@ -91,37 +96,46 @@ func main() {
 			MaxRetries:         3,
 		}, sessionRegistry)
 		if err != nil {
-			return
+			log.Fatalf("failed to create grpc client: %v", err)
 		}
-		defer func(grpcClient *client.Client) {
+		grpcClient = c
-			err := grpcClient.Close()
-			if err != nil {
 
-			}
+		healthCtx, healthCancel := context.WithTimeout(ctx, 5*time.Second)
-		}(grpcClient)
+		if err := grpcClient.CheckServerHealth(healthCtx); err != nil {
-
+			healthCancel()
-		ctx, cancel = context.WithTimeout(context.Background(), time.Second*5)
+			log.Fatalf("gRPC health check failed: %v", err)
-		err = grpcClient.CheckServerHealth(ctx)
-		if err != nil {
-			log.Fatalf("gRPC health check failed: %s", err)
-			return
 		}
-		cancel()
+		healthCancel()
 
-		ctx, cancel = context.WithCancel(context.Background())
 		go func() {
 			identity := config.Getenv("DOMAIN", "localhost")
-			err = grpcClient.SubscribeEvents(ctx, identity, nodeToken)
+			if err := grpcClient.SubscribeEvents(ctx, identity, nodeToken); err != nil {
-			if err != nil {
+				errChan <- fmt.Errorf("failed to subscribe to events: %w", err)
-				return
 			}
 		}()
 	}
 
-	app, err := server.NewServer(sshConfig, sessionRegistry, grpcClient)
+	go func() {
-	if err != nil {
+		app, err := server.NewServer(sshConfig, sessionRegistry, grpcClient)
-		log.Fatalf("Failed to start server: %s", err)
+		if err != nil {
+			errChan <- fmt.Errorf("failed to start server: %s", err)
+			return
+		}
+		app.Start()
+	}()
+
+	select {
+	case err := <-errChan:
+		log.Printf("error happen : %s", err)
+	case sig := <-shutdownChan:
+		log.Printf("received signal %s, shutting down", sig)
 	}
-	app.Start()
+
 	cancel()
+
+	if grpcClient != nil {
+		if err := grpcClient.Close(); err != nil {
+			log.Printf("failed to close grpc conn : %s", err)
+		}
+	}
 }