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A tiny library for monitoring and testing asyncio programs
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README.rst

aiodebug

This is a tiny library for monitoring and testing asyncio programs. Its monitoring features are meant to be always on in production.

Aiodebug will use logwood if it is installed, otherwise it will default to the standard logging module.

Aiodebug is only tested with Python 3.5. There are no plans to support older versions.

Log warnings when callbacks block the event loop

aiodebug.log_slow_callbacks.enable(0.05)

This will produce WARNING-level logs such as

Executing <Task pending coro=<foo() running at /home/.../foo.py:37>
wait_for=<Future pending cb=[Task._wakeup()]>> took 0.069 seconds

Asyncio already does this in debug mode, but you probably don't want to enable full-on debug mode in production.

Track event loop lags in StatsD

aiodebug.monitor_loop_lag.enable(statsd_client)

Tracks how much scheduled calls get delayed and sends the lags to StatsD:

https://github.com/qntln/aiodebug/raw/master/docs/loop-lags.png

Speed up or slow down time in the event loop

This is mainly useful for testing.

loop = aiodebug.testing.time_dilated_loop.TimeDilatedLoop()
asyncio.set_event_loop(loop)

loop.time_dilation = 3
await asyncio.sleep(1) # Takes 0.333s of real time

loop.time_dilation = 0.1
await asyncio.sleep(1) # Takes 10s of real time
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