PyQT Quamash 循环和 open_connection 'ValueError：循环参数必须与 Future 一致'

Question

我在 pyqt 上使用 quamash 循环（异步）和其他模块来异步连接到 RethinkDB。如果我不使用 quamash，RethinkDb 模块会以完美的方式连接。但是当使用 quamash 循环时，尽管将它放在每个关键参数循环上，它都会像这样失败：

  File "/home/dpineda/.virtualenvs/dragoncharts/lib/python3.6/site-packages/rethinkdb/asyncio_net/net_asyncio.py", line 148, in connect
    loop=self._io_loop)
  File "/usr/local/lib/python3.6/asyncio/streams.py", line 76, in open_connection
    lambda: protocol, host, port, **kwds)
  File "/usr/local/lib/python3.6/asyncio/base_events.py", line 731, in create_connection
    yield from tasks.wait(fs, loop=self)
  File "/usr/local/lib/python3.6/asyncio/tasks.py", line 311, in wait
    fs = {ensure_future(f, loop=loop) for f in set(fs)}
  File "/usr/local/lib/python3.6/asyncio/tasks.py", line 311, in <setcomp>
    fs = {ensure_future(f, loop=loop) for f in set(fs)}
  File "/usr/local/lib/python3.6/asyncio/tasks.py", line 514, in ensure_future
    raise ValueError('loop argument must agree with Future')
ValueError: loop argument must agree with Future

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/asyncio/events.py", line 127, in _run
    self._callback(*self._args)
  File "/home/dpineda/Proyectos/TaskTools/tasktools/taskloop.py", line 40, in renew_quamash
    raise task.result()
  File "/home/dpineda/Proyectos/TaskTools/tasktools/taskloop.py", line 11, in coromask
    obtained=await coro(*args)
  File "/home/dpineda/Proyectos/DragonCharts/dragoncharts/qtgui/interface.py", line 382, in updates
    await self.read_stations_queue()
  File "/home/dpineda/Proyectos/DragonCharts/dragoncharts/qtgui/interface.py", line 257, in read_stations_queue
    conn=await self.connect_rethinkdb()
  File "/home/dpineda/Proyectos/DragonCharts/dragoncharts/qtgui/interface.py", line 315, in connect_rethinkdb
    conn=await r.async_connect()
  File "/home/dpineda/Proyectos/NetworkTools/networktools/dbs/rethinkdb.py", line 43, in async_connect
    **kwargs)
  File "/home/dpineda/.virtualenvs/dragoncharts/lib/python3.6/site-packages/rethinkdb/asyncio_net/net_asyncio.py", line 293, in reconnect
    return (yield from self._instance.connect(timeout))
  File "/home/dpineda/.virtualenvs/dragoncharts/lib/python3.6/site-packages/rethinkdb/asyncio_net/net_asyncio.py", line 156, in connect
    (self._parent.host, self._parent.port, str(err)))
rethinkdb.errors.ReqlDriverError: Could not connect to atlas.csn.uchile.cl:28015. Error: loop argument must agree with Future

所以，到目前为止，我认为我的技能是控制它的极限，因为这是 quamash 和 asyncio 库之间的兼容性问题！

或者，有什么解决办法？

谢谢！

Answer 1

确保将 quamash 循环设置为默认全局循环：

from quamash import QEventLoop

loop = QEventLoop(app)
asyncio.set_event_loop(loop)

单靠它很有可能会有所帮助。

但如果没有，请将 sn-p 放在脚本的顶部，使其在任何异步模块导入之前执行。

更新：

没有检查它是否有效，但您可以尝试使用dependency injection through multiple inheritance 来获取具有两个事件循环属性的类：

import asyncio
from quamash import QEventLoop

AEventLoop = type(asyncio.get_event_loop())


class QEventLoopPlus(QEventLoop, AEventLoop):
    pass


loop = QEventLoopPlus(app)
asyncio.set_event_loop(loop)