show error dialog when failed to init websocket

src/langs/zh_Hans.txt

@@ -199,6 +199,7 @@ RPC host cannot be empty!=RPC 主机不能为空!
 RPC secret is not base64 encoded!=RPC 密钥不是 Base64 编码后的字符串!
 URL is not base64 encoded!=指定 URL 不是 Base64 编码后的字符串!
 Tap to configure and get started with AriaNg.=您还没有进行过设置, 点击这里进行设置.
+Cannot initialize WebSocket!=无法初始化 WebSocket!
 
 [error]
 unknown=未知错误.

src/langs/zh_Hant.txt

@@ -199,6 +199,7 @@ RPC host cannot be empty!=RPC 主機不能為空!
 RPC secret is not base64 encoded!=RPC 密鑰不是 Base64 編碼後的字元串!
 URL is not base64 encoded!=指定 URL 不是 Base64 編碼後的字元串!
 Tap to configure and get started with AriaNg.=您還沒有進行過設置, 點擊這裡進行設置.
+Cannot initialize WebSocket!=無法初始化 WebSocket!
 
 [error]
 unknown=未知錯誤.

src/scripts/config/configuration.js

@@ -1,7 +1,9 @@
 (function () {
     'use strict';
 
-    angular.module('ariaNg').config(['$translateProvider', 'localStorageServiceProvider', 'NotificationProvider', 'ariaNgConstants', 'ariaNgLanguages', function ($translateProvider, localStorageServiceProvider, NotificationProvider, ariaNgConstants, ariaNgLanguages) {
+    angular.module('ariaNg').config(['$qProvider', '$translateProvider', 'localStorageServiceProvider', 'NotificationProvider', 'ariaNgConstants', 'ariaNgLanguages', function ($qProvider, $translateProvider, localStorageServiceProvider, NotificationProvider, ariaNgConstants, ariaNgLanguages) {
+        $qProvider.errorOnUnhandledRejections(false);
+
         localStorageServiceProvider
             .setPrefix(ariaNgConstants.appPrefix)
             .setStorageType('localStorage')

src/scripts/config/defaultLanguage.js

@@ -203,6 +203,7 @@
             'RPC secret is not base64 encoded!': 'RPC secret is not base64 encoded!',
             'URL is not base64 encoded!': 'URL is not base64 encoded!',
             'Tap to configure and get started with AriaNg.': 'Tap to configure and get started with AriaNg.',
+            'Cannot initialize WebSocket!': 'Cannot initialize WebSocket!',
             'error': {
                 'unknown': 'Unknown error occurred.',
                 'operation.timeout': 'Operation timed out.',

src/scripts/services/aria2WebSocketRpcService.js

@@ -29,7 +29,7 @@
             });
 
             if (content.result && context.successCallback) {
-                ariaNgLogService.debug('[aria2WebSocketRpcService.request] response uccess', content);
+                ariaNgLogService.debug('[aria2WebSocketRpcService.request] response success', content);
 
                 context.successCallback(context.id, content.result);
             }
@@ -65,6 +65,7 @@
 
         var getSocketClient = function () {
             if (socketClient === null) {
+                try {
                     socketClient = $websocket(rpcUrl);
 
                     socketClient.onMessage(function (message) {
@@ -84,9 +85,19 @@
                             processEventCallback(content);
                         }
                     });
+                } catch (ex) {
+                    return {
+                        success: false,
+                        error: 'Cannot initialize WebSocket!',
+                        exception: ex
+                    }
+                }
             }
 
-            return socketClient;
+            return {
+                success: true,
+                instance: socketClient
+            };
         };
 
         return {
@@ -108,7 +119,17 @@
                     deferred: deferred
                 };
 
-                client.send(requestBody);
+                if (client.instance) {
+                    client.instance.send(requestBody);
+                } else {
+                    deferred.reject({
+                        success: false,
+                        context: context
+                    });
+
+                    ariaNgLogService.debug('[aria2WebSocketRpcService.request] client error', client);
+                    context.errorCallback(context.id, { message: client.error });
+                }
 
                 return deferred.promise;
             },