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Keep-alive logic implemented for websocket backend

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This commit is contained in:
Fabio Manganiello 2018-10-27 01:09:09 +02:00
parent 92a3759721
commit b365e7d126
1 changed files with 34 additions and 14 deletions
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48
platypush/backend/websocket.py
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@ -19,7 +19,11 @@ class WebsocketBackend(Backend):
* **websockets** (``pip install websockets``)
"""
def __init__(self, port=8765, bind_address='0.0.0.0', ssl_cert=None, **kwargs):
# Websocket client message recv timeout in seconds
_websocket_client_timeout = 60
def __init__(self, port=8765, bind_address='0.0.0.0', ssl_cert=None,
client_timeout=_websocket_client_timeout, **kwargs):
"""
:param port: Listen port for the websocket server (default: 8765)
:type port: int
@ -29,6 +33,9 @@ class WebsocketBackend(Backend):
:param ssl_cert: Path to the PEM certificate file if you want to enable SSL (default: None)
:type ssl_cert: str
:param client_timeout: Timeout without any messages being received before closing a client connection. A zero timeout keeps the websocket open until an error occurs (default: 60 seconds)
:type ping_timeout: int
"""
super().__init__(**kwargs)
@ -36,6 +43,7 @@ class WebsocketBackend(Backend):
self.port = port
self.bind_address = bind_address
self.ssl_context = None
self.client_timeout = client_timeout
if ssl_cert:
self.ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
@ -62,29 +70,39 @@ class WebsocketBackend(Backend):
super().run()
async def serve_client(websocket, path):
self.logger.info('New websocket connection from {}'.
self.logger.debug('New websocket connection from {}'.
format(websocket.remote_address[0]))
try:
msg = await websocket.recv()
msg = Message.build(msg)
self.logger.info('Received message from {}: {}'.
format(websocket.remote_address[0], msg))
while True:
if self.client_timeout:
msg = await asyncio.wait_for(websocket.recv(),
timeout=self.client_timeout)
else:
msg = await websocket.recv()
self.on_message(msg)
msg = Message.build(msg)
self.logger.info('Received message from {}: {}'.
format(websocket.remote_address[0], msg))
if isinstance(msg, Request):
response = self.get_message_response(msg)
self.on_message(msg)
if isinstance(msg, Request):
response = self.get_message_response(msg)
assert response is not None
if response:
self.logger.info('Processing response on the websocket backend: {}'.
format(response))
format(response))
await websocket.send(str(response))
except Exception as e:
if isinstance(e, websockets.exceptions.ConnectionClosed):
self.logger.info('Websocket client {} closed connection'.
format(websocket.remote_address[0]))
self.logger.debug('Websocket client {} closed connection'.
format(websocket.remote_address[0]))
elif isinstance(e, asyncio.TimeoutError):
self.logger.debug('Websocket connection to {} timed out'.
format(websocket.remote_address[0]))
else:
self.logger.exception(e)
@ -96,7 +114,9 @@ class WebsocketBackend(Backend):
websocket_args['ssl'] = self.ssl_context
loop = get_or_create_event_loop()
server = websockets.serve(serve_client, self.bind_address, self.port, **websocket_args)
server = websockets.serve(serve_client, self.bind_address, self.port,
**websocket_args)
loop.run_until_complete(server)
loop.run_forever()