fix: improve task cancellation and connection health check logic with timeout handling

core/task/handler/runner.go

@@ -279,6 +279,24 @@ func (r *Runner) Cancel(force bool) (err error) {
 	// Signal goroutines to stop
 	r.cancel()
 
+	// Stop health check ticker immediately to prevent interference
+	if r.connHealthTicker != nil {
+		r.connHealthTicker.Stop()
+		r.Debugf("stopped connection health ticker")
+	}
+
+	// Close gRPC connection to stop health check messages
+	r.connMutex.Lock()
+	if r.conn != nil {
+		_ = r.conn.CloseSend()
+		r.conn = nil
+		r.Debugf("closed gRPC connection to stop health checks")
+	}
+	r.connMutex.Unlock()
+
+	// Wait a moment for background goroutines to respond to cancellation signal
+	time.Sleep(100 * time.Millisecond)
+
 	// If force is not requested, try graceful termination first
 	if !force {
 		r.Debugf("attempting graceful termination of process[%d]", r.pid)
@@ -334,6 +352,19 @@ forceKill:
 		case <-ticker.C:
 			if !utils.ProcessIdExists(r.pid) {
 				r.Debugf("process[%d] terminated successfully", r.pid)
+				// Wait for background goroutines to finish with timeout
+				done := make(chan struct{})
+				go func() {
+					r.wg.Wait()
+					close(done)
+				}()
+
+				select {
+				case <-done:
+					r.Debugf("all background goroutines stopped")
+				case <-time.After(5 * time.Second):
+					r.Warnf("some background goroutines did not stop within timeout")
+				}
 				return nil
 			}
 		}
@@ -906,7 +937,16 @@ func (r *Runner) isConnectionHealthy() bool {
 	if r.conn == nil {
 		return false
 	}
-	// Try to send a ping-like message to test connection
+
+	// Check if context is already cancelled - don't do health checks during cancellation
+	select {
+	case <-r.ctx.Done():
+		r.Debugf("skipping health check - task is being cancelled")
+		return false
+	default:
+	}
+
+	// Try to send a ping-like message to test connection with timeout
 	// Use a simple log message as ping since PING code doesn't exist
 	testMsg := &grpc.TaskServiceConnectRequest{
 		Code:   grpc.TaskServiceConnectCode_INSERT_LOGS,
@@ -914,12 +954,27 @@ func (r *Runner) isConnectionHealthy() bool {
 		Data:   []byte(`["[HEALTH CHECK] connection test"]`),
 	}
 
-	if err := r.conn.Send(testMsg); err != nil {
-		r.Debugf("connection health check failed: %v", err)
+	// Use a channel to make the Send operation timeout-aware
+	done := make(chan error, 1)
+	go func() {
+		done <- r.conn.Send(testMsg)
+	}()
+
+	// Wait for either completion or timeout
+	select {
+	case err := <-done:
+		if err != nil {
+			r.Debugf("connection health check failed: %v", err)
+			return false
+		}
+		return true
+	case <-time.After(5 * time.Second):
+		r.Debugf("connection health check timed out")
+		return false
+	case <-r.ctx.Done():
+		r.Debugf("connection health check cancelled")
 		return false
 	}
-
-	return true
 }
 
 // reconnectWithRetry attempts to reconnect to the gRPC service with exponential backoff