websocket upload notification - closed #24 (#25)

* Render when a new asset is uploaded from WebSocket notification
* Update Readme

mobile/lib/shared/providers/websocket.provider.dart

@@ -0,0 +1,113 @@
+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
+import 'package:hive/hive.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/modules/home/providers/asset.provider.dart';
+import 'package:immich_mobile/shared/models/immich_asset.model.dart';
+import 'package:socket_io_client/socket_io_client.dart';
+
+import 'package:immich_mobile/constants/hive_box.dart';
+import 'package:immich_mobile/modules/login/providers/authentication.provider.dart';
+
+class WebscoketState {
+  final Socket? socket;
+  final bool isConnected;
+
+  WebscoketState({
+    this.socket,
+    required this.isConnected,
+  });
+
+  WebscoketState copyWith({
+    Socket? socket,
+    bool? isConnected,
+  }) {
+    return WebscoketState(
+      socket: socket ?? this.socket,
+      isConnected: isConnected ?? this.isConnected,
+    );
+  }
+
+  @override
+  String toString() => 'WebscoketState(socket: $socket, isConnected: $isConnected)';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is WebscoketState && other.socket == socket && other.isConnected == isConnected;
+  }
+
+  @override
+  int get hashCode => socket.hashCode ^ isConnected.hashCode;
+}
+
+class WebsocketNotifier extends StateNotifier<WebscoketState> {
+  WebsocketNotifier(this.ref) : super(WebscoketState(socket: null, isConnected: false)) {
+    debugPrint("Init websocket instance");
+  }
+
+  final Ref ref;
+
+  connect() {
+    var authenticationState = ref.watch(authenticationProvider);
+
+    if (authenticationState.isAuthenticated) {
+      var accessToken = Hive.box(userInfoBox).get(accessTokenKey);
+      var endpoint = Hive.box(userInfoBox).get(serverEndpointKey);
+      try {
+        debugPrint("[WEBSOCKET] Attempting to connect to ws");
+        // Configure socket transports must be sepecified
+        Socket socket = io(
+          endpoint,
+          OptionBuilder()
+              .setTransports(['websocket'])
+              .enableReconnection()
+              .enableForceNew()
+              .enableForceNewConnection()
+              .enableAutoConnect()
+              .setExtraHeaders({"Authorization": "Bearer $accessToken"})
+              .build(),
+        );
+
+        socket.onConnect((_) {
+          debugPrint("[WEBSOCKET] Established Websocket Connection");
+          state = WebscoketState(isConnected: true, socket: socket);
+        });
+
+        socket.onDisconnect((_) {
+          debugPrint("[WEBSOCKET] Disconnect to Websocket Connection");
+          state = WebscoketState(isConnected: false, socket: null);
+        });
+
+        socket.on('error', (errorMessage) {
+          debugPrint("Webcoket Error - $errorMessage");
+          state = WebscoketState(isConnected: false, socket: null);
+        });
+
+        socket.on('on_upload_success', (data) {
+          var jsonString = jsonDecode(data.toString());
+          ImmichAsset newAsset = ImmichAsset.fromMap(jsonString);
+          ref.watch(assetProvider.notifier).onNewAssetUploaded(newAsset);
+        });
+      } catch (e) {
+        debugPrint("[WEBSOCKET] Catch Websocket Error - ${e.toString()}");
+      }
+    }
+  }
+
+  disconnect() {
+    debugPrint("[WEBSOCKET] Attempting to disconnect");
+    var socket = state.socket?.disconnect();
+    if (socket != null) {
+      if (socket.disconnected) {
+        state = WebscoketState(isConnected: false, socket: null);
+      }
+    }
+  }
+}
+
+final websocketProvider = StateNotifierProvider<WebsocketNotifier, WebscoketState>((ref) {
+  return WebsocketNotifier(ref);
+});