Runtime error: Event loop is running

问题:

I get the following error when I call the function send_message.

Exception in thread Thread-1: Traceback (most recent call last):   File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner     self.run()   File "/usr/lib/python3.4/threading.py", line 868, in run     self._target(*self._args, **self._kwargs)   File "/home/joffe/Documents/discord/irc/ircbot.py", line 44, in get_message     mydiscord.send_message(line[1])   File "/home/joffe/Documents/discord/irc/mydiscord.py", line 37, in send_message     client.loop.run_until_complete(client.send_message(SERVER,message))   File "/usr/lib/python3.4/asyncio/base_events.py", line 331, in run_until_complete     self.run_forever()   File "/usr/lib/python3.4/asyncio/base_events.py", line 296, in run_forever     raise RuntimeError('Event loop is running.') RuntimeError: Event loop is running. 

My function send_message takes a message and sends it to a discord channel. The function is called from a function that is running in a thread. The client object is created in the main thread.

def send_message(message):     print(str.encode("Message to discord: " + message))      client.loop.run_until_complete(client.send_message(SERVER,message)) 

回答1:

I've only seen the "Event loop is running" exception when I call loop.run_until_complete on a loop that is already running (in another thread, perhaps?)

If the loop is already running in another thread and you want to submit a coroutine for it to execute, use:

asyncio.run_coroutine_threadsafe(client.send_message(SERVER, message), client.loop) 

If you are trying to add a coroutine to the loop and that loop is running on the current thread, then the best way is probably to just await/yield from it, but if you're scheduling it from a synchronous function, then you probably want:

asyncio.ensure_future(     client.send_message(SERVER, message),     loop=client.loop ).add_done_callback(fn) 

Where fn is a function whose only parameter is the future that's created by ensure_future and is called after the future is completed.

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