use mutable bytearray instead of bytes as buffer (#152)

Author: mdumandag

hazelcast/connection.py

@@ -271,7 +271,7 @@ def __init__(self, address, connection_closed_callback, message_callback):
         self.logger = logging.getLogger("Connection[%s](%s:%d)" % (self.id, address.host, address.port))
         self._connection_closed_callback = connection_closed_callback
         self._builder = ClientMessageBuilder(message_callback)
-        self._read_buffer = b""
+        self._read_buffer = bytearray()
         self.last_read_in_seconds = 0
         self.last_write_in_seconds = 0
         self.start_time_in_seconds = 0

hazelcast/reactor.py

@@ -186,7 +186,7 @@ def handle_connect(self):
         self.logger.debug("Connected to %s", self._address)
 
     def handle_read(self):
-        self._read_buffer += self.recv(BUFFER_SIZE)
+        self._read_buffer.extend(self.recv(BUFFER_SIZE))
         self.last_read_in_seconds = time.time()
         self.receive_message()