fix: use single channel for broadcasting events, as there won't be multiple StreamEventsClient anyway

internal/native/grpc_server.go

@@ -15,18 +15,20 @@ import (
 // grpcServer wraps the Native instance and implements the gRPC service
 type grpcServer struct {
 	pb.UnimplementedNativeServiceServer
-	native  *Native
-	logger  *zerolog.Logger
-	eventCh chan *pb.Event
-	eventM  sync.Mutex
+	native            *Native
+	logger            *zerolog.Logger
+	eventStreamChan   chan *pb.Event
+	eventStreamMu     sync.Mutex
+	eventStreamCtx    context.Context
+	eventStreamCancel context.CancelFunc
 }
 
 // NewGRPCServer creates a new gRPC server for the native service
 func NewGRPCServer(n *Native, logger *zerolog.Logger) *grpcServer {
 	s := &grpcServer{
-		native:  n,
-		logger:  logger,
-		eventCh: make(chan *pb.Event, 100),
+		native:          n,
+		logger:          logger,
+		eventStreamChan: make(chan *pb.Event, 100),
 	}
 
 	// Store original callbacks and wrap them to also broadcast events
@@ -82,7 +84,7 @@ func NewGRPCServer(n *Native, logger *zerolog.Logger) *grpcServer {
 }
 
 func (s *grpcServer) broadcastEvent(event *pb.Event) {
-	s.eventCh <- event
+	s.eventStreamChan <- event
 }
 
 func (s *grpcServer) IsReady(ctx context.Context, req *pb.IsReadyRequest) (*pb.IsReadyResponse, error) {
@@ -94,15 +96,49 @@ func (s *grpcServer) StreamEvents(req *pb.Empty, stream pb.NativeService_StreamE
 	setProcTitle("connected")
 	defer setProcTitle("waiting")
 
+	// Cancel previous stream if exists
+	s.eventStreamMu.Lock()
+	if s.eventStreamCancel != nil {
+		s.logger.Debug().Msg("cancelling previous StreamEvents call")
+		s.eventStreamCancel()
+	}
+
+	// Create a cancellable context for this stream
+	ctx, cancel := context.WithCancel(stream.Context())
+	s.eventStreamCtx = ctx
+	s.eventStreamCancel = cancel
+	s.eventStreamMu.Unlock()
+
+	// Clean up when this stream ends
+	defer func() {
+		s.eventStreamMu.Lock()
+		defer s.eventStreamMu.Unlock()
+		if s.eventStreamCtx == ctx {
+			s.eventStreamCancel = nil
+			s.eventStreamCtx = nil
+		}
+		cancel()
+	}()
+
 	// Stream events
 	for {
 		select {
-		case event := <-s.eventCh:
+		case event := <-s.eventStreamChan:
+			// Check if this stream is still the active one
+			s.eventStreamMu.Lock()
+			isActive := s.eventStreamCtx == ctx
+			s.eventStreamMu.Unlock()
+
+			if !isActive {
+				s.logger.Debug().Msg("stream replaced by new call, exiting")
+				return context.Canceled
+			}
+
 			if err := stream.Send(event); err != nil {
 				return err
 			}
-		case <-stream.Context().Done():
-			return stream.Context().Err()
+		case <-ctx.Done():
+			return ctx.Err()
 		}
 	}
 }