A tiny library for monitoring and testing asyncio programs
Project description
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 secondsAsyncio 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:
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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