perf(go): cache identity binding lookups

go/vehicle-gateway/internal/identity/resolver_test.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/DATA-DOG/go-sqlmock"
 
@@ -188,9 +189,6 @@ func TestMySQLResolverTracksFirstJT808LocationThenThrottles(t *testing.T) {
 		WillReturnError(sql.ErrNoRows)
 	mock.ExpectExec("INSERT INTO jt808_registration").
 		WillReturnResult(sqlmock.NewResult(1, 1))
-	mock.ExpectQuery("SELECT vin FROM vehicle_identity_binding WHERE phone = \\?").
-		WithArgs("13307795425").
-		WillReturnError(sql.ErrNoRows)
 
 	resolver := NewMySQLResolver(db, "vehicle_identity_binding")
 	for i := 0; i < 2; i++ {
@@ -210,6 +208,32 @@ func TestMySQLResolverTracksFirstJT808LocationThenThrottles(t *testing.T) {
 	}
 }
 
+func TestMySQLResolverCachesIdentityMissesForHighFrequencyFrames(t *testing.T) {
+	db, mock := newMockDB(t)
+	defer db.Close()
+	mock.ExpectQuery("SELECT vin FROM vehicle_identity_binding WHERE phone = \\?").
+		WithArgs("13307795425").
+		WillReturnError(sql.ErrNoRows)
+
+	resolver := NewMySQLResolverWithOptions(db, "vehicle_identity_binding", MySQLResolverOptions{
+		LocationTouchInterval: time.Hour,
+		LookupCacheTTL:        time.Hour,
+	})
+	for i := 0; i < 2; i++ {
+		_, err := resolver.Resolve(context.Background(), envelope.FrameEnvelope{
+			Protocol: envelope.ProtocolJT808,
+			Phone:    "013307795425",
+			Parsed:   map[string]any{},
+		})
+		if err != nil {
+			t.Fatalf("Resolve() error = %v", err)
+		}
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("sql expectations: %v", err)
+	}
+}
+
 func TestMySQLResolverEnsuresMinimalIdentitySchema(t *testing.T) {
 	db, mock := newMockDB(t)
 	defer db.Close()