Make clients and client counter instance specific

Author: Pithikos

websocket_server/websocket_server.py

@@ -112,14 +112,14 @@ class WebsocketServer(ThreadingMixIn, TCPServer, API):
     allow_reuse_address = True
     daemon_threads = True  # comment to keep threads alive until finished
 
-    clients = []
-    id_counter = 0
-
     def __init__(self, port, host='127.0.0.1', loglevel=logging.WARNING):
         logger.setLevel(loglevel)
         TCPServer.__init__(self, (host, port), WebSocketHandler)
         self.port = self.socket.getsockname()[1]
 
+        self.clients = []
+        self.id_counter = 0
+
     def _message_received_(self, handler, msg):
         self.message_received(self.handler_to_client(handler), self, msg)