use SharedPreferencesAsync to avoid race condition in Sharedprefs

This was so painful to debug...

lib/controllers/key.dart

@@ -1,28 +1,28 @@
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/controllers/shared_prefs.dart";
 
-class KeyController(final String key) extends Notifier<String?> {
+class KeyController(final String key) extends AsyncNotifier<String?> {
   static const String spaceKey = "space";
   static const String roomKey = "room";
   static const String pushKeyKey = "pushKey";
 
   @override
-  String? build() =>
-      ref.watch(SharedPrefsController.provider).requireValue.getString(key);
+  Future<String?> build() =>
+      ref.watch(SharedPrefsController.provider).getString(key);
 
   Future<void> set(String? value) async {
-    final prefs = ref.watch(SharedPrefsController.provider).requireValue;
-    state = value;
+    final prefs = ref.watch(SharedPrefsController.provider);
+    state = .data(value);
 
     if (value == null) {
-      prefs.remove(key);
+      await prefs.remove(key);
     } else {
-      prefs.setString(key, value);
+      await prefs.setString(key, value);
     }
   }
 
   static final provider =
-      NotifierProvider.family<KeyController, String?, String>(
+      AsyncNotifierProvider.family<KeyController, String?, String>(
         KeyController.new,
       );
 }

lib/controllers/member_list_opened.dart

@@ -1,22 +1,20 @@
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/controllers/shared_prefs.dart";
 
-class MemberListOpenedController extends Notifier<bool> {
+class MemberListOpenedController extends AsyncNotifier<bool> {
   static const String key = "memberListOpened";
 
   @override
-  bool build() =>
-      ref.watch(SharedPrefsController.provider).requireValue.getBool(key) ??
-      true;
+  Future<bool> build() async =>
+      await ref.watch(SharedPrefsController.provider).getBool(key) ?? true;
 
   Future<void> set(bool value) async {
-    final prefs = ref.watch(SharedPrefsController.provider).requireValue;
-    state = value;
-
-    prefs.setBool(key, value);
+    state = .data(value);
+    await ref.watch(SharedPrefsController.provider).setBool(key, value);
   }
 
-  static final provider = NotifierProvider<MemberListOpenedController, bool>(
-    MemberListOpenedController.new,
-  );
+  static final provider =
+      AsyncNotifierProvider<MemberListOpenedController, bool>(
+        MemberListOpenedController.new,
+      );
 }

lib/controllers/push_key.dart

@@ -4,18 +4,19 @@ import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:nexus/controllers/key.dart";
 
-class PushKeyController(final String instance) extends Notifier<String?> {
+class PushKeyController(final String instance) extends AsyncNotifier<String?> {
   @override
-  String? build() => json.decode(
-    ref.watch(KeyController.provider(KeyController.pushKeyKey)) ?? "{}",
+  Future<String?> build() async => json.decode(
+    await ref.watch(KeyController.provider(KeyController.pushKeyKey).future) ??
+        "{}",
   )[instance];
 
   Future<void> set(String? value) async {
     final provider = KeyController.provider(KeyController.pushKeyKey);
     final notifier = ref.watch(provider.notifier);
-    final prefs = IMap(json.decode(ref.watch(provider) ?? "{}"));
+    final prefs = IMap(json.decode(await ref.watch(provider.future) ?? "{}"));
 
-    state = value;
+    state = .data(value);
     notifier.set(
       json.encode(
         prefs.add(instance, value).where((_, value) => value != null).unlock,
@@ -24,7 +25,7 @@ class PushKeyController(final String instance) extends Notifier<String?> {
   }
 
   static final provider =
-      NotifierProvider.family<PushKeyController, String?, String>(
+      AsyncNotifierProvider.family<PushKeyController, String?, String>(
         PushKeyController.new,
       );
 }

lib/controllers/shared_prefs.dart

@@ -1,12 +1,12 @@
 import "package:flutter_riverpod/flutter_riverpod.dart";
 import "package:shared_preferences/shared_preferences.dart";
 
-class SharedPrefsController extends AsyncNotifier<SharedPreferences> {
+class SharedPrefsController extends Notifier<SharedPreferencesAsync> {
   @override
-  Future<SharedPreferences> build() async => .getInstance();
+  SharedPreferencesAsync build() => SharedPreferencesAsync();
 
   static final provider =
-      AsyncNotifierProvider<SharedPrefsController, SharedPreferences>(
+      NotifierProvider<SharedPrefsController, SharedPreferencesAsync>(
         SharedPrefsController.new,
       );
 }

lib/controllers/unified_push.dart

@@ -13,7 +13,6 @@ import "package:nexus/controllers/client.dart";
 import "package:nexus/controllers/client_state.dart";
 import "package:nexus/models/content/message.dart";
 import "package:nexus/models/content/sticker.dart";
-import "package:nexus/models/requests/register_pusher.dart";
 import "package:unifiedpush/unifiedpush.dart";
 import "package:unifiedpush_storage_shared_preferences/storage.dart";
 import "package:window_manager/window_manager.dart";
@@ -40,8 +39,8 @@ class UnifiedPushController extends AsyncNotifier<bool> {
           .new(
             appDisplayName: "Nexus",
             appId: "nexus.federated.nexus",
-            data: PusherData.webPush(
-              url: Uri.parse(endpoint.url),
+            data: .webPush(
+              url: .parse(endpoint.url),
               auth: endpoint.pubKeySet!.auth,
             ),
             deviceDisplayName:
@@ -67,7 +66,9 @@ class UnifiedPushController extends AsyncNotifier<bool> {
             event.unreadType?.shouldNotify() != true ||
             (!isInBackground &&
                 await windowManager.isFocused().onError((_, _) => false) &&
-                ref.watch(KeyController.provider(KeyController.roomKey)) ==
+                await ref.watch(
+                      KeyController.provider(KeyController.roomKey).future,
+                    ) ==
                     event.roomId)) {
           if (isInBackground) exit(0);
           return;
@@ -146,7 +147,9 @@ class UnifiedPushController extends AsyncNotifier<bool> {
 
   Future<void> deregister() async {
     final clientState = ref.watch(ClientStateController.provider);
-    final key = ref.watch(PushKeyController.provider(clientState!.deviceId!));
+    final key = await ref.watch(
+      PushKeyController.provider(clientState!.deviceId!).future,
+    );
 
     if (key != null) {
       await ref