feat(go): enrich realtime snapshot context

go/vehicle-gateway/internal/gateway/tcp_server.go

@@ -32,6 +32,10 @@ type TCPProtocol struct {
 	Respond  FrameResponder
 }
 
+type connectionState struct {
+	platformName string
+}
+
 type TCPServer struct {
 	protocol       TCPProtocol
 	sink           eventbus.Sink
@@ -155,6 +159,7 @@ func (s *TCPServer) handleConnection(ctx context.Context, conn net.Conn) {
 
 	readBuffer := make([]byte, s.readBufferSize)
 	var pending []byte
+	state := &connectionState{}
 	for {
 		_ = conn.SetReadDeadline(time.Now().Add(s.idleTimeout))
 		n, err := conn.Read(readBuffer)
@@ -167,7 +172,7 @@ func (s *TCPServer) handleConnection(ctx context.Context, conn net.Conn) {
 			}
 			pending = remainder
 			for _, frame := range frames {
-				s.handleFrame(ctx, conn, frame, source)
+				s.handleFrame(ctx, conn, frame, source, state)
 			}
 		}
 		if err != nil {
@@ -188,7 +193,7 @@ func (s *TCPServer) handleConnection(ctx context.Context, conn net.Conn) {
 	}
 }
 
-func (s *TCPServer) handleFrame(ctx context.Context, conn net.Conn, raw []byte, source string) {
+func (s *TCPServer) handleFrame(ctx context.Context, conn net.Conn, raw []byte, source string, state *connectionState) {
 	frameCtx, cancelFrame := context.WithTimeout(context.WithoutCancel(ctx), frameOperationTimeout)
 	defer cancelFrame()
 
@@ -217,6 +222,7 @@ func (s *TCPServer) handleFrame(ctx context.Context, conn net.Conn, raw []byte,
 		} else {
 			env = resolved
 		}
+		enrichConnectionPlatform(&env, state)
 	}
 	s.recordFrameMetric(env.ParseStatus)
 
@@ -254,6 +260,30 @@ func (s *TCPServer) handleFrame(ctx context.Context, conn net.Conn, raw []byte,
 	}
 }
 
+func enrichConnectionPlatform(env *envelope.FrameEnvelope, state *connectionState) {
+	if env == nil || state == nil || env.ParseStatus == envelope.ParseBadFrame {
+		return
+	}
+	if env.Fields == nil {
+		env.Fields = map[string]any{}
+	}
+	if current := strings.TrimSpace(fmt.Sprint(env.Fields["platform_account"])); current != "" && current != "<nil>" {
+		state.platformName = current
+	}
+	if state.platformName == "" {
+		return
+	}
+	if strings.TrimSpace(fmt.Sprint(env.Fields["platform_account"])) == "" || fmt.Sprint(env.Fields["platform_account"]) == "<nil>" {
+		env.Fields["platform_account"] = state.platformName
+	}
+	if env.Parsed == nil {
+		env.Parsed = map[string]any{}
+	}
+	if _, ok := env.Parsed["platform_name"]; !ok {
+		env.Parsed["platform_name"] = state.platformName
+	}
+}
+
 func (s *TCPServer) recordFrameMetric(status envelope.ParseStatus) {
 	if s.metrics == nil {
 		return