我正在尝试使用Python中的WebSocket模块创建一个简单的WebSocket服务器
我的任务是创建一个WebSocket服务器,将消息发送给所有正在侦听它的客户端。问题是,每次客户端断开连接时,WebSocket都会启动一个异常(ConnectionClosedOK
或ConnectionClosedError
,具体取决于发生的情况),我需要捕获该异常,因为我必须注销已断开连接的客户端,以便WebSocket停止在以太网上发送消息(并停止WebSocket服务器在每次尝试向关闭的客户端发送消息时抛出这些异常)
以下是服务器的代码:
async def foo_call():
await asyncio.sleep(3)
print('Hi!')
async def register(websocket):
users.add(websocket)
await notify_users()
async def unregister(websocket):
users.remove(websocket)
async def start(websocket, path):
await register(websocket)
try:
await foo_call()
except websockets.ConnectionClosedError:
await unregister(websocket)
# WebSocket clients that are listening this WebSocket server
users = set()
# Open WebSocket server
start_server = websockets.serve(start, "localhost", 8765)
# Run asyncio event loop
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()
这是回溯:
Task exception was never retrieved
future: <Task finished coro=<WebSocketCommonProtocol.send() done, defined at /home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py:521> exception=ConnectionClosedError('code = 1006 (connection closed abnormally [internal]), no reason',)>
Traceback (most recent call last):
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 827, in transfer_data
message = await self.read_message()
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 895, in read_message
frame = await self.read_data_frame(max_size=self.max_size)
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 971, in read_data_frame
frame = await self.read_frame(max_size)
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 1051, in read_frame
extensions=self.extensions,
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/framing.py", line 105, in read
data = await reader(2)
File "/usr/lib/python3.6/asyncio/streams.py", line 672, in readexactly
raise IncompleteReadError(incomplete, n)
asyncio.streams.IncompleteReadError: 0 bytes read on a total of 2 expected bytes
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 555, in send
await self.ensure_open()
File "/home/vlado/Projects/dahua/venv/lib/python3.6/site-packages/websockets/protocol.py", line 803, in ensure_open
raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason
我真的不明白如何捕捉websockets模块抛出的异常
目前没有回答
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