feat(go): publish realtime fields stream

go/vehicle-gateway/internal/eventbus/nats_sink.go

@@ -16,6 +16,7 @@ type NATSConfig struct {
 	URL            string
 	Name           string
 	RawSubjects    map[envelope.Protocol]string
+	FieldsSubjects map[envelope.Protocol]string
 	UnifiedSubject string
 }
 
@@ -23,6 +24,7 @@ type NATSSink struct {
 	conn           *nats.Conn
 	publisher      natsPublisher
 	rawSubjects    map[envelope.Protocol]string
+	fieldsSubjects map[envelope.Protocol]string
 	unifiedSubject string
 }
 
@@ -65,6 +67,16 @@ func newNATSSinkWithPublisher(publisher natsPublisher, cfg NATSConfig) *NATSSink
 			rawSubjects[protocol] = subject
 		}
 	}
+	fieldsSubjects := map[envelope.Protocol]string{
+		envelope.ProtocolGB32960:    topics.FieldsGB32960,
+		envelope.ProtocolJT808:      topics.FieldsJT808,
+		envelope.ProtocolYutongMQTT: topics.FieldsYutongMQTT,
+	}
+	for protocol, subject := range cfg.FieldsSubjects {
+		if subject != "" {
+			fieldsSubjects[protocol] = subject
+		}
+	}
 	unifiedSubject := cfg.UnifiedSubject
 	if unifiedSubject == "" {
 		unifiedSubject = topics.Unified
@@ -72,6 +84,7 @@ func newNATSSinkWithPublisher(publisher natsPublisher, cfg NATSConfig) *NATSSink
 	return &NATSSink{
 		publisher:      publisher,
 		rawSubjects:    rawSubjects,
+		fieldsSubjects: fieldsSubjects,
 		unifiedSubject: unifiedSubject,
 	}
 }
@@ -91,6 +104,14 @@ func (s *NATSSink) PublishUnified(ctx context.Context, env envelope.FrameEnvelop
 	return s.publish(ctx, s.unifiedSubject, env)
 }
 
+func (s *NATSSink) PublishFields(ctx context.Context, env envelope.FrameEnvelope) error {
+	subject, ok := s.fieldsSubjects[env.Protocol]
+	if !ok || subject == "" {
+		return fmt.Errorf("fields subject not configured for protocol %s", env.Protocol)
+	}
+	return s.publish(ctx, subject, env)
+}
+
 func (s *NATSSink) Close() error {
 	if s == nil || s.conn == nil {
 		return nil