refactor(go): default to go vehicle topics

go/vehicle-gateway/cmd/realtime-api/main.go

@@ -24,6 +24,7 @@ import (
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/observability"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/realtime"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/stats"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/topics"
 )
 
 func main() {
@@ -163,15 +164,16 @@ func consumeKafka(ctx context.Context, logger interface {
 	Error(string, ...any)
 	Warn(string, ...any)
 }, registry *metrics.Registry, updater realtimeUpdater, brokers []string) {
+	kafkaTopics := kafkaTopicsFromEnv()
 	reader := kafka.NewReader(kafka.ReaderConfig{
 		Brokers:     brokers,
 		GroupID:     env("KAFKA_GROUP", "go-realtime-api"),
-		GroupTopics: splitCSV(env("KAFKA_TOPICS", "vehicle.event.unified.v1")),
+		GroupTopics: kafkaTopics,
 		MinBytes:    1,
 		MaxBytes:    10e6,
 	})
 	defer reader.Close()
-	logger.Info("realtime kafka consumer started", "topics", env("KAFKA_TOPICS", "vehicle.event.unified.v1"))
+	logger.Info("realtime kafka consumer started", "topics", strings.Join(kafkaTopics, ","))
 	for {
 		message, err := reader.FetchMessage(ctx)
 		if err != nil {
@@ -185,6 +187,10 @@ func consumeKafka(ctx context.Context, logger interface {
 	}
 }
 
+func kafkaTopicsFromEnv() []string {
+	return splitCSV(env("KAFKA_TOPICS", topics.Unified))
+}
+
 const kafkaMessageOperationTimeout = 30 * time.Second
 
 type realtimeUpdater interface {

go/vehicle-gateway/cmd/realtime-api/main_test.go

@@ -95,6 +95,14 @@ func TestCompositeRealtimeUpdaterUpdatesBothStores(t *testing.T) {
 	}
 }
 
+func TestKafkaTopicsFromEnvDefaultsToGoUnifiedTopic(t *testing.T) {
+	got := strings.Join(kafkaTopicsFromEnv(), ",")
+	want := "vehicle.event.go.unified.v1"
+	if got != want {
+		t.Fatalf("topics = %q, want %q", got, want)
+	}
+}
+
 type contextCheckingRealtimeUpdater struct {
 	ctxErr error
 	count  int