Allows to check queue status (#411)

src/AsyncWebSocket.cpp

@@ -544,6 +544,11 @@ void AsyncWebSocketClient::_runQueue(){
   }
 }
 
+bool AsyncWebSocketClient::queueIsFull(){
+  if((_messageQueue.length() >= WS_MAX_QUEUED_MESSAGES) || (_status != WS_CONNECTED) ) return true;
+  return false;
+}
+
 void AsyncWebSocketClient::_queueMessage(AsyncWebSocketMessage *dataMessage){
   if(dataMessage == NULL)
     return;
@@ -876,6 +881,20 @@ void AsyncWebSocket::_handleDisconnect(AsyncWebSocketClient * client){
   });
 }
 
+bool AsyncWebSocket::availableForWriteAll(){
+  for(const auto& c: _clients){
+    if(c->queueIsFull()) return false;
+  }
+  return true;
+}
+
+bool AsyncWebSocket::availableForWrite(uint32_t id){
+  for(const auto& c: _clients){
+    if(c->queueIsFull() && (c->id() == id )) return false;
+  }
+  return true;
+}
+
 size_t AsyncWebSocket::count() const {
   return _clients.count_if([](AsyncWebSocketClient * c){
     return c->status() == WS_CONNECTED;