Non-blocking I/O with asyncio

Question

I\'m trying to write a networked game with Pygame and asyncio, but I can\'t work out how to avoid hanging on reads. Here is my code for the client:

@asyncio.coro         


        

Answer 1

well since you are trying to read the value of 'line' right after you call read() you need that value at any cost...

if the coroutine wouldn't stop cause there are no data, you could get an AttributeError on the line.decode() call if 'line' then is None.

one thing you can do is to set a timeout on the blocking call and handle the timeout exception:

...
print("Waiting to read")
try:  # block at most for one second
    line = yield from asyncio.wait_for(reader.read(2**12), 1)
except asyncio.TimeoutError:
    continue
else:
    print(line.decode())
...