I would like to submit jobs from a thread to an asyncio
event loop (just like run_in_executor but the other way around).
Here\'s what the asyncio
My request made its way and a run_coroutine_threadsafe function has been implemented here.
Example:
def target(loop, timeout=None):
future = asyncio.run_coroutine_threadsafe(add(1, b=2), loop)
return future.result(timeout)
async def add(a, b):
await asyncio.sleep(1)
return a + b
loop = asyncio.get_event_loop()
future = loop.run_in_executor(None, target, loop)
assert loop.run_until_complete(future) == 3
I originally posted a sub-class of concurrent.futures.Executor that can still be implemented as:
class LoopExecutor(concurrent.futures.Executor):
"""An Executor subclass that uses an event loop
to execute calls asynchronously."""
def __init__(self, loop=None):
"""Initialize the executor with a given loop."""
self.loop = loop or asyncio.get_event_loop()
def submit(self, fn, *args, **kwargs):
"""Schedule the callable, fn, to be executed as fn(*args **kwargs).
Return a Future object representing the execution of the callable."""
coro = asyncio.coroutine(fn)(*args, **kwargs)
return asyncio.run_coroutine_threadsafe(coro, self.loop)