Merge pull request #512 from appwrite/fix-flutter-concurrent-init-calls

Author: lohanidamodar

templates/flutter/lib/src/client_io.dart.twig

@@ -34,13 +34,15 @@ class ClientIO extends ClientBase with ClientMixin {
   @override
   late Map<String, String> config;
   bool selfSigned;
+  bool _initProgress = false;
   bool _initialized = false;
   String? _endPointRealtime;
   late http.Client _httpClient;
   late HttpClient _nativeClient;
   late CookieJar _cookieJar;
   final List<Interceptor> _interceptors = [];
 
+  bool get initProgress => _initProgress;
   bool get initialized => _initialized;
   CookieJar get cookieJar => _cookieJar;
   @override
@@ -126,6 +128,8 @@ class ClientIO extends ClientBase with ClientMixin {
   }
 
   Future init() async {
+    if(_initProgress) return;
+    _initProgress = true;
     // if web skip cookie implementation and origin header as those are automatically handled by browsers
     final Directory cookieDir = await _getCookiePath();
     _cookieJar = PersistCookieJar(storage: FileStorage(cookieDir.path));
@@ -168,6 +172,7 @@ class ClientIO extends ClientBase with ClientMixin {
         'user-agent', '${packageInfo.packageName}/${packageInfo.version} $device');
 
     _initialized = true;
+    _initProgress = false;
   }
 
   Future<http.BaseRequest> _interceptRequest(http.BaseRequest request) async {
@@ -326,6 +331,9 @@ class ClientIO extends ClientBase with ClientMixin {
     Map<String, dynamic> params = const {},
     ResponseType? responseType,
   }) async {
+    while (!_initialized && _initProgress) {
+      await Future.delayed(Duration(milliseconds: 10));
+    }
     if (!_initialized) {
       await init();
     }

templates/flutter/lib/src/realtime_io.dart.twig

@@ -23,6 +23,9 @@ class RealtimeIO extends RealtimeBase with RealtimeMixin {
 
   Future<WebSocketChannel> _getWebSocket(Uri uri) async {
     Map<String, String>? headers;
+    while (!(client as ClientIO).initialized && (client as ClientIO).initProgress) {
+      await Future.delayed(Duration(milliseconds: 10));
+    }
     if (!(client as ClientIO).initialized) {
       await (client as ClientIO).init();
     }