fix(gateway): prefer known JT808 identity snapshot

2026-09-01 10:58:46 +08:00
parent 861e0bf207
commit 6fceb0f5b4
2 changed files with 68 additions and 0 deletions
@@ -74,6 +74,62 @@ func TestSnapshotOnlyResolverMissDoesNotQueryMySQL(t *testing.T) {
 	}
 }

+func TestKnownSnapshotRecoversAfterUnknownJT808SessionCache(t *testing.T) {
+	db, mock := newMockDB(t)
+	defer db.Close()
+
+	resolver := NewMySQLResolverWithOptions(db, "vehicle_identity_binding", MySQLResolverOptions{
+		SnapshotOnlyLookups:       true,
+		DisableRegistrationWrites: true,
+		LookupCacheTTL:            10 * time.Minute,
+	})
+	resolver.snapshot.Store(&identitySnapshot{
+		bindings:    map[string]string{},
+		identifiers: map[string]vehicleIdentifierMatch{},
+		registrations: map[string]registrationCacheEntry{
+			"64100005824": {vin: "LB9A32A2XR0LS1401", plate: "粤AGP9713"},
+		},
+		sources: map[string]sourceMetadata{},
+	})
+
+	// A reconnect normally authenticates before the first location report. The
+	// authentication frame has no VIN and therefore creates an unknown session.
+	if _, err := resolver.Resolve(context.Background(), envelope.FrameEnvelope{
+		Protocol:  envelope.ProtocolJT808,
+		MessageID: JT808AuthMessageID,
+		Phone:     "64100005824",
+		Parsed:    map[string]any{},
+	}); err != nil {
+		t.Fatalf("resolve authentication frame: %v", err)
+	}
+	if entry := resolver.registrationCache["64100005824"]; entry.vin != "unknown" {
+		t.Fatalf("authentication session vin = %q, want unknown setup", entry.vin)
+	}
+
+	resolved, err := resolver.Resolve(context.Background(), envelope.FrameEnvelope{
+		Protocol:  envelope.ProtocolJT808,
+		MessageID: "0x0200",
+		Phone:     "64100005824",
+		Parsed:    map[string]any{},
+	})
+	if err != nil {
+		t.Fatalf("resolve location frame: %v", err)
+	}
+	if resolved.VIN != "LB9A32A2XR0LS1401" || resolved.Plate != "粤AGP9713" {
+		t.Fatalf("resolved identity = vin:%q plate:%q", resolved.VIN, resolved.Plate)
+	}
+	identityMetadata, _ := resolved.Parsed["identity"].(map[string]any)
+	if identityMetadata["cache_status"] != "snapshot" {
+		t.Fatalf("identity metadata = %#v, want authoritative snapshot", identityMetadata)
+	}
+	if entry := resolver.registrationCache["64100005824"]; entry.vin != "LB9A32A2XR0LS1401" {
+		t.Fatalf("location frame did not heal session cache: %+v", entry)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("snapshot-only recovery should not query mysql: %v", err)
+	}
+}
+
 func TestRefreshSnapshotFailureKeepsLastKnownGoodSnapshot(t *testing.T) {
 	db, mock := newMockDB(t)
 	defer db.Close()