Question

为什么：

async def setup():
    async with websockets.connect('ws:/ip.address:port') as ws:
        await ws.send('TEST MESSAGE')

def startup():
    loop = asyncio.new_event_loop() # because it's running in a thread
    asyncio.set_event_loop(loop)
    asyncio.ensure_future(setup())
    loop.run_forever()

向websocket发送消息，然后：

async def setup():
    async with websockets.connect('ws:/ip.address:port') as ws:
        loop = asyncio.get_event_loop()
        loop.create_task(send_messages(ws))

async def send_messages(ws):
    await ws.send('TEST MESSAGE')

def startup():
    loop = asyncio.new_event_loop() # because it's running in a thread
    asyncio.set_event_loop(loop)
    asyncio.ensure_future(setup())
    loop.run_forever()

没有按＆＃39;？吨

我已经从我的代码中删除了代码以简化它 - 如果需要可以发布原始代码。第二个版本似乎在等待开始记录，调试等等ws.send('test')部分。

我想知道将websocket连接作为参数传递是否是一个问题。如果您记录传递的内容和接收的内容，它们都会同时返回<websockets.client.WebSocketClientProtocol object at 0x04B51A90>相同的地址。

我最终想做的事情，以及如何做到这一点的建议是受欢迎的，即使这个问题无法回答：

有两个协同程序在运行，非常永远： *通过tkinter GUI中的常规函数从队列中获取消息，并将它们发送到websocket *从websocket获取消息并改变GUI中的内容

我认为将websockets库作为asyncio是这样做的方法，但我愿意接受任何建议。

编辑：忘了添加错误消息！

2017-03-19 10:49:31,103 ERROR asyncio Task exception was never retrieved
future: <Task finished coro=<send_messages() done, defined at chessboard.py:74> exception=ConnectionClosed('WebSocket connection is closed: code = 1000, no reason.',) created at chessboard.py:103>
source_traceback: Object created at (most recent call last):
  File "C:\Program Files (x86)\Python35-32\lib\threading.py", line 882, in _bootstrap
    self._bootstrap_inner()
  File "C:\Program Files (x86)\Python35-32\lib\threading.py", line 914, in _bootstrap_inner
    self.run()
  File "C:\Program Files (x86)\Python35-32\lib\threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "chessboard.py", line 120, in startup
    loop.run_forever()
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\base_events.py", line 345, in run_forever
    self._run_once()
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\base_events.py", line 1312, in _run_once
    handle._run()
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\events.py", line 125, in _run
    self._callback(*self._args)
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\tasks.py", line 307, in _wakeup
    self._step()
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\tasks.py", line 239, in _step
    result = coro.send(None)
  File "chessboard.py", line 103, in setup
    loop.create_task(send_messages(ws))
Traceback (most recent call last):
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\tasks.py", line 239, in _step
    result = coro.send(None)
  File "C:\Program Files (x86)\Python35-32\lib\asyncio\coroutines.py", line 121, in send
    return self.gen.send(value)
  File "chessboard.py", line 81, in send_messages
    await ws.send(str(message))#seems to be stopping here - why isn't it sending?
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\websockets\protocol.py", line 309, in send
    yield from self.ensure_open()
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\websockets\protocol.py", line 401, in ensure_open
    raise ConnectionClosed(self.close_code, self.close_reason)
websockets.exceptions.ConnectionClosed: WebSocket connection is closed: code = 1000, no reason.

Answer 1

将websocket作为参数传递是可以的。这里的问题是当等待send协程时，websocket连接已经关闭（如您的错误消息中所述）。这是因为连接上下文在send_messages任务可以发送消息之前完成。

相反，请考虑这个工作示例：

async def main():
    async with websockets.connect('ws:/ip.address:port') as ws:
        await send_messages(ws)

async def send_messages(ws):
    await ws.send('TEST MESSAGE')


loop = asyncio.get_event_loop()
loop.run_until_complete(main)

为什么我不能在协同程序调用的协程中发送websocket？

1 个答案: