fix(exporter): fix agent reconnect

Signed-off-by: xiayu.lyt <[email protected]>

pkg/exporter/task-agent/agent.go

@@ -2,7 +2,6 @@ package taskagent
 
 import (
 	"context"
-	"fmt"
 	"os"
 	"time"
 
@@ -32,26 +31,21 @@ type Agent struct {
 func (a *Agent) Run() error {
 	var opts []grpc.CallOption
 	opts = append(opts, grpc.MaxCallSendMsgSize(102*1024*1024))
-	conn, err := grpc.Dial(controllerAddr, grpc.WithDefaultCallOptions(opts...),
-		grpc.WithTransportCredentials(insecure.NewCredentials()))
-	if err != nil {
-		return fmt.Errorf("failed to connect: %v", err)
-	}
-	a.grpcClient = rpc.NewControllerRegisterServiceClient(conn)
-	watchClient, err := a.grpcClient.WatchTasks(context.TODO(), &rpc.TaskFilter{
-		NodeName: a.NodeName,
-		Type:     []rpc.TaskType{rpc.TaskType_Capture, rpc.TaskType_Ping},
-	})
-	if err != nil {
-		return fmt.Errorf("failed to watch tasks: %v", err)
-	}
-	reconn := func() {
+	var conn *grpc.ClientConn
+	var watchClient rpc.ControllerRegisterService_WatchTasksClient
+
+	reconn := func() error {
 		time.Sleep(1 * time.Second)
+		log.Infof("connecting to controller.")
+		if conn != nil {
+			_ = conn.Close()
+		}
+		var err error
 		conn, err = grpc.Dial(controllerAddr, grpc.WithDefaultCallOptions(opts...),
 			grpc.WithTransportCredentials(insecure.NewCredentials()))
 		if err != nil {
 			log.Errorf("failed to connect: %v", err)
-			return
+			return err
 		}
 		a.grpcClient = rpc.NewControllerRegisterServiceClient(conn)
 		watchClient, err = a.grpcClient.WatchTasks(context.TODO(), &rpc.TaskFilter{
@@ -60,22 +54,33 @@ func (a *Agent) Run() error {
 		})
 		if err != nil {
 			log.Errorf("failed to watch: %v", err)
+			return err
 		}
+		log.Infof("controller connected.")
+		return nil
+	}
+
+	err := reconn()
+	if err != nil {
+		return err
 	}
 
 	go func() {
-		defer conn.Close()
 		for {
+			if watchClient == nil {
+				_ = reconn()
+				continue
+			}
 			select {
 			case <-watchClient.Context().Done():
 				log.Errorf("watch client closed")
-				reconn()
+				_ = reconn()
 				continue
 			default:
 				task, err := watchClient.Recv()
 				if err != nil {
 					log.Errorf("failed to receive task: %v", err)
-					reconn()
+					_ = reconn()
 					continue
 				}
 				err = a.ProcessTasks(task)