feat(go): publish realtime fields stream

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

@@ -14,12 +14,14 @@ import (
 type Sink interface {
 	PublishRaw(context.Context, envelope.FrameEnvelope) error
 	PublishUnified(context.Context, envelope.FrameEnvelope) error
+	PublishFields(context.Context, envelope.FrameEnvelope) error
 	Close() error
 }
 
 type KafkaSink struct {
 	writer       kafkaWriter
 	rawTopics    map[envelope.Protocol]string
+	fieldsTopics map[envelope.Protocol]string
 	unifiedTopic string
 }
 
@@ -31,6 +33,7 @@ type kafkaWriter interface {
 type KafkaConfig struct {
 	Brokers      []string
 	RawTopics    map[envelope.Protocol]string
+	FieldsTopics map[envelope.Protocol]string
 	UnifiedTopic string
 }
 
@@ -58,11 +61,21 @@ func newKafkaSinkWithWriter(writer kafkaWriter, cfg KafkaConfig) *KafkaSink {
 			rawTopics[protocol] = topic
 		}
 	}
+	fieldsTopics := map[envelope.Protocol]string{
+		envelope.ProtocolGB32960:    topics.FieldsGB32960,
+		envelope.ProtocolJT808:      topics.FieldsJT808,
+		envelope.ProtocolYutongMQTT: topics.FieldsYutongMQTT,
+	}
+	for protocol, topic := range cfg.FieldsTopics {
+		if topic != "" {
+			fieldsTopics[protocol] = topic
+		}
+	}
 	unifiedTopic := cfg.UnifiedTopic
 	if unifiedTopic == "" {
 		unifiedTopic = topics.Unified
 	}
-	return &KafkaSink{writer: writer, rawTopics: rawTopics, unifiedTopic: unifiedTopic}
+	return &KafkaSink{writer: writer, rawTopics: rawTopics, fieldsTopics: fieldsTopics, unifiedTopic: unifiedTopic}
 }
 
 func (s *KafkaSink) PublishRaw(ctx context.Context, env envelope.FrameEnvelope) error {
@@ -77,6 +90,14 @@ func (s *KafkaSink) PublishUnified(ctx context.Context, env envelope.FrameEnvelo
 	return s.publish(ctx, s.unifiedTopic, env)
 }
 
+func (s *KafkaSink) PublishFields(ctx context.Context, env envelope.FrameEnvelope) error {
+	topic, ok := s.fieldsTopics[env.Protocol]
+	if !ok || topic == "" {
+		return fmt.Errorf("fields topic not configured for protocol %s", env.Protocol)
+	}
+	return s.publish(ctx, topic, env)
+}
+
 func (s *KafkaSink) PublishRecords(ctx context.Context, records []durableRecord) error {
 	messages := make([]kafka.Message, 0, len(records))
 	for _, record := range records {
@@ -121,6 +142,12 @@ func (s *KafkaSink) topicForRecord(record durableRecord) (string, error) {
 		return topic, nil
 	case "unified":
 		return s.unifiedTopic, nil
+	case "fields":
+		topic, ok := s.fieldsTopics[record.Envelope.Protocol]
+		if !ok || topic == "" {
+			return "", fmt.Errorf("fields topic not configured for protocol %s", record.Envelope.Protocol)
+		}
+		return topic, nil
 	default:
 		return "", fmt.Errorf("unknown durable record kind %q", record.Kind)
 	}