Cache server version for use when server is down

app/lib/controller/account_controller.dart

@@ -63,6 +63,7 @@ class AccountController {
   ServerController get serverController =>
       _serverController ??= ServerController(
         account: _account!,
+        accountPrefController: accountPrefController,
       );
 
   AccountPrefController get accountPrefController =>

app/lib/controller/account_pref_controller.dart

@@ -1,8 +1,12 @@
+import 'dart:convert';
+
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
 import 'package:nc_photos/entity/person.dart';
 import 'package:nc_photos/entity/pref.dart';
+import 'package:nc_photos/entity/server_status.dart';
 import 'package:np_codegen/np_codegen.dart';
+import 'package:np_common/object_util.dart';
 import 'package:rxdart/rxdart.dart';
 
 part 'account_pref_controller.g.dart';
@@ -52,6 +56,13 @@ class AccountPrefController {
         value: value,
       );
 
+  Future<void> setServerStatus(ServerStatus value) => _set(
+        controller: _serverStatusController,
+        setter: (pref, value) =>
+            pref.setServerStatus(jsonEncode(value!.toJson())),
+        value: value,
+      );
+
   Future<void> _set<T>({
     required BehaviorSubject<T> controller,
     required Future<bool> Function(AccountPref pref, T value) setter,
@@ -89,4 +100,8 @@ class AccountPrefController {
   @npSubjectAccessor
   late final _hasNewSharedAlbumController =
       BehaviorSubject.seeded(_accountPref.hasNewSharedAlbum() ?? false);
+  @npSubjectAccessor
+  late final _serverStatusController = BehaviorSubject.seeded(_accountPref
+      .getServerStatus()
+      ?.let((e) => ServerStatus.fromJson(jsonDecode(e))));
 }

app/lib/controller/account_pref_controller.g.dart

@@ -50,4 +50,10 @@ extension $AccountPrefControllerNpSubjectAccessor on AccountPrefController {
   Stream<bool> get hasNewSharedAlbumChange =>
       hasNewSharedAlbum.distinct().skip(1);
   bool get hasNewSharedAlbumValue => _hasNewSharedAlbumController.value;
+// _serverStatusController
+  ValueStream<ServerStatus?> get serverStatus => _serverStatusController.stream;
+  Stream<ServerStatus?> get serverStatusNew => serverStatus.skip(1);
+  Stream<ServerStatus?> get serverStatusChange =>
+      serverStatus.distinct().skip(1);
+  ServerStatus? get serverStatusValue => _serverStatusController.value;
 }

app/lib/controller/account_pref_controller/util.dart

@@ -5,4 +5,13 @@ extension on AccountPref {
       provider.getBool(AccountPrefKey.hasNewSharedAlbum);
   // Future<bool> setNewSharedAlbum(bool value) =>
   //     provider.setBool(AccountPrefKey.hasNewSharedAlbum, value);
+
+  String? getServerStatus() => provider.getString(AccountPrefKey.serverStatus);
+  Future<bool> setServerStatus(String? value) {
+    if (value == null) {
+      return provider.remove(AccountPrefKey.serverStatus);
+    } else {
+      return provider.setString(AccountPrefKey.serverStatus, value);
+    }
+  }
 }

app/lib/controller/server_controller.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
 import 'package:nc_photos/api/entity_converter.dart';
+import 'package:nc_photos/controller/account_pref_controller.dart';
 import 'package:nc_photos/entity/server_status.dart';
 import 'package:nc_photos/np_api_util.dart';
 import 'package:np_api/np_api.dart' as api;
@@ -20,6 +21,7 @@ enum ServerFeature {
 class ServerController {
   ServerController({
     required this.account,
+    required this.accountPrefController,
   });
 
   void dispose() {
@@ -33,17 +35,6 @@ class ServerController {
     return _statusStreamContorller.stream;
   }
 
-  bool isSupported(ServerFeature feature) {
-    switch (feature) {
-      case ServerFeature.ncAlbum:
-        return !_statusStreamContorller.hasValue ||
-            _statusStreamContorller.value.majorVersion >= 25;
-      case ServerFeature.ncMetadata:
-        return !_statusStreamContorller.hasValue ||
-            _statusStreamContorller.value.majorVersion >= 28;
-    }
-  }
-
   Future<void> _load() => _getStatus();
 
   Future<void> _getStatus() async {
@@ -51,19 +42,49 @@ class ServerController {
       final response = await ApiUtil.fromAccount(account).status().get();
       if (!response.isGood) {
         _log.severe("[_getStatus] Failed requesting server: $response");
+        _loadStatus();
         return;
       }
       final apiStatus = await api.StatusParser().parse(response.body);
       final status = ApiStatusConverter.fromApi(apiStatus);
       _log.info("[_getStatus] Server status: $status");
       _statusStreamContorller.add(status);
+      _saveStatus(status);
     } catch (e, stackTrace) {
       _log.severe("[_getStatus] Failed while get", e, stackTrace);
+      _loadStatus();
       return;
     }
   }
 
+  void _loadStatus() {
+    final cache = accountPrefController.serverStatusValue;
+    if (cache != null) {
+      _statusStreamContorller.add(cache);
+    }
+  }
+
+  void _saveStatus(ServerStatus status) {
+    final cache = accountPrefController.serverStatusValue;
+    if (cache != status) {
+      accountPrefController.setServerStatus(status);
+    }
+  }
+
   final Account account;
+  final AccountPrefController accountPrefController;
 
   final _statusStreamContorller = BehaviorSubject<ServerStatus>();
 }
+
+extension ServerControllerExtension on ServerController {
+  bool isSupported(ServerFeature feature) {
+    final status = _statusStreamContorller.valueOrNull;
+    switch (feature) {
+      case ServerFeature.ncAlbum:
+        return status == null || status.majorVersion >= 25;
+      case ServerFeature.ncMetadata:
+        return status != null && status.majorVersion >= 28;
+    }
+  }
+}

app/lib/entity/pref.dart

@@ -230,6 +230,7 @@ enum AccountPrefKey implements PrefKeyInterface {
   accountLabel,
   lastNewCollectionType,
   personProvider,
+  serverStatus,
   ;
 
   @override
@@ -249,6 +250,8 @@ enum AccountPrefKey implements PrefKeyInterface {
         return "lastNewCollectionType";
       case AccountPrefKey.personProvider:
         return "personProvider";
+      case AccountPrefKey.serverStatus:
+        return "serverStatus";
     }
   }
 }

app/lib/entity/server_status.dart

@@ -1,9 +1,11 @@
+import 'package:equatable/equatable.dart';
+import 'package:np_common/type.dart';
 import 'package:to_string/to_string.dart';
 
 part 'server_status.g.dart';
 
 @toString
-class ServerStatus {
+class ServerStatus with EquatableMixin {
   const ServerStatus({
     required this.versionRaw,
     required this.versionName,
@@ -13,6 +15,25 @@ class ServerStatus {
   @override
   String toString() => _$toString();
 
+  factory ServerStatus.fromJson(JsonObj json) {
+    return ServerStatus(
+      versionRaw: json["versionRaw"],
+      versionName: json["versionName"],
+      productName: json["productName"],
+    );
+  }
+
+  JsonObj toJson() {
+    return {
+      "versionRaw": versionRaw,
+      "versionName": versionName,
+      "productName": productName,
+    };
+  }
+
+  @override
+  List<Object?> get props => [versionRaw, versionName, productName];
+
   final String versionRaw;
   final String versionName;
   final String productName;

app/lib/service/service.dart

@@ -9,10 +9,10 @@ import 'package:kiwi/kiwi.dart';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/app_init.dart' as app_init;
 import 'package:nc_photos/app_localizations.dart';
+import 'package:nc_photos/controller/account_pref_controller.dart';
 import 'package:nc_photos/controller/pref_controller.dart';
 import 'package:nc_photos/di_container.dart';
 import 'package:nc_photos/entity/file_descriptor.dart';
-import 'package:nc_photos/entity/pref.dart';
 import 'package:nc_photos/event/native_event.dart';
 import 'package:nc_photos/language_util.dart' as language_util;
 import 'package:nc_photos/use_case/battery_ensurer.dart';
@@ -95,13 +95,14 @@ class _Service {
   }
 
   Future<void> _doWork() async {
-    final prefController = PrefController(Pref());
+    final c = KiwiContainer().resolve<DiContainer>();
+    final prefController = PrefController(c.pref);
     final account = prefController.currentAccountValue;
     if (account == null) {
       _log.shout("[_doWork] account == null");
       return;
     }
-    final c = KiwiContainer().resolve<DiContainer>();
+    final accountPrefController = AccountPrefController(account: account);
 
     final wifiEnsurer = WifiEnsurer(
       interrupter: _shouldRun.stream,
@@ -143,7 +144,7 @@ class _Service {
       batteryEnsurer: batteryEnsurer,
     );
     final processedIds = <int>[];
-    await for (final f in syncOp.syncAccount(account)) {
+    await for (final f in syncOp.syncAccount(account, accountPrefController)) {
       processedIds.add(f.fdId);
       service.setNotificationInfo(
         title: _L10n.global().metadataTaskProcessingNotification,

app/lib/use_case/sync_metadata/sync_metadata.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
+import 'package:nc_photos/controller/account_pref_controller.dart';
 import 'package:nc_photos/controller/server_controller.dart';
 import 'package:nc_photos/db/entity_converter.dart';
 import 'package:nc_photos/entity/exif_util.dart';
@@ -10,6 +11,7 @@ import 'package:nc_photos/entity/file/file_cache_manager.dart';
 import 'package:nc_photos/entity/file/repo.dart';
 import 'package:nc_photos/entity/file_util.dart' as file_util;
 import 'package:nc_photos/geocoder_util.dart';
+import 'package:nc_photos/service/service.dart';
 import 'package:nc_photos/use_case/battery_ensurer.dart';
 import 'package:nc_photos/use_case/get_file_binary.dart';
 import 'package:nc_photos/use_case/load_metadata.dart';
@@ -38,10 +40,14 @@ class SyncMetadata {
     required this.batteryEnsurer,
   });
 
-  Stream<File> syncAccount(Account account) async* {
+  Stream<File> syncAccount(
+    Account account,
+    AccountPrefController accountPrefController,
+  ) async* {
     final bool isNcMetadataSupported;
     try {
-      isNcMetadataSupported = await _isNcMetadataSupported(account);
+      isNcMetadataSupported =
+          (await _isNcMetadataSupported(account, accountPrefController))!;
     } catch (e) {
       _log.severe("[syncAccount] Failed to get server version", e);
       return;
@@ -111,8 +117,14 @@ class SyncMetadata {
     yield* stream;
   }
 
-  Future<bool> _isNcMetadataSupported(Account account) async {
+  Future<bool?> _isNcMetadataSupported(
-    final serverController = ServerController(account: account);
+    Account account,
+    AccountPrefController accountPrefController,
+  ) async {
+    final serverController = ServerController(
+      account: account,
+      accountPrefController: accountPrefController,
+    );
     await serverController.status.first.timeout(const Duration(seconds: 15));
     return serverController.isSupported(ServerFeature.ncMetadata);
   }