feat: add go vehicle identity resolver

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

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"database/sql"
 	"log/slog"
 	"os"
 	"os/signal"
@@ -10,9 +11,12 @@ import (
 	"syscall"
 	"time"
 
+	_ "github.com/go-sql-driver/mysql"
+
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/eventbus"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/gateway"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/identity"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/observability"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/protocol/gb32960"
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/protocol/jt808"
@@ -29,6 +33,12 @@ func main() {
 		os.Exit(1)
 	}
 	defer sink.Close()
+	resolver, closeResolver, err := buildIdentityResolver(ctx, logger)
+	if err != nil {
+		logger.Error("build identity resolver failed", "error", err)
+		os.Exit(1)
+	}
+	defer closeResolver()
 
 	protocols := []gateway.TCPProtocol{
 		{
@@ -51,6 +61,7 @@ func main() {
 		server, err := gateway.NewTCPServer(gateway.TCPServerConfig{
 			Protocol:       protocol,
 			Sink:           sink,
+			Resolver:       resolver,
 			Logger:         logger,
 			ReadBufferSize: envInt("TCP_READ_BUFFER_BYTES", 64*1024),
 			IdleTimeout:    time.Duration(envInt("TCP_IDLE_TIMEOUT_SECONDS", 180)) * time.Second,
@@ -78,6 +89,7 @@ func main() {
 			Topics:       splitCSV(env("YUTONG_MQTT_TOPICS", env("YUTONG_MQTT_TOPIC", "/ytforward/shln/+"))),
 			QoS:          byte(envInt("YUTONG_MQTT_QOS", 2)),
 			Sink:         sink,
+			Resolver:     resolver,
 			Logger:       logger,
 		})
 		if err != nil {
@@ -101,6 +113,25 @@ func main() {
 	wg.Wait()
 }
 
+func buildIdentityResolver(ctx context.Context, logger *slog.Logger) (identity.Resolver, func(), error) {
+	dsn := env("IDENTITY_MYSQL_DSN", strings.TrimSpace(os.Getenv("MYSQL_DSN")))
+	if strings.TrimSpace(dsn) == "" {
+		logger.Warn("identity mysql dsn is empty; using noop identity resolver")
+		return identity.NoopResolver{}, func() {}, nil
+	}
+	db, err := sql.Open("mysql", dsn)
+	if err != nil {
+		return nil, nil, err
+	}
+	if err := db.PingContext(ctx); err != nil {
+		_ = db.Close()
+		return nil, nil, err
+	}
+	table := env("VEHICLE_IDENTITY_TABLE", "vehicle_identity_binding")
+	logger.Info("identity mysql resolver enabled", "table", table)
+	return identity.NewMySQLResolver(db, table), func() { _ = db.Close() }, nil
+}
+
 func buildSink(logger *slog.Logger) (eventbus.Sink, error) {
 	brokers := splitCSV(os.Getenv("KAFKA_BROKERS"))
 	if len(brokers) == 0 {