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python asyncio graceful shutdown with SIGINT, SIGTERM
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import signal | |
import asyncio | |
import logging | |
def register_graceful_shutdown(loop: asyncio.AbstractEventLoop): | |
""" Register signal handlers """ | |
for s in (signal.SIGINT, signal.SIGTERM): | |
loop.add_signal_handler(s, _signal_exit, s, loop) # pass s(signal), loop to _signal_exit | |
def _signal_exit(s, loop: asyncio.AbstractEventLoop): | |
logging.info(f"SIGNAL ({s.name})") | |
t = loop.create_task(_close_all_tasks()) | |
t.add_done_callback(lambda _: loop.stop()) | |
async def _close_all_tasks(): | |
""" Close all tasks """ | |
tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()] | |
logging.info(f"Closing {len(tasks)} tasks...") | |
for task in tasks: | |
task.cancel() | |
await asyncio.wait(*tasks) | |
async def dumb_task(): | |
""" A dumb task """ | |
try: | |
while True: | |
logging.info(f"dumb task") | |
await asyncio.sleep(1) | |
except asyncio.CancelledError: | |
logging.info("dumb task is cleaning up itself") | |
await asyncio.sleep(1) | |
raise | |
if __name__ == "__main__": | |
logging.basicConfig(level=logging.DEBUG, format=f"%(asctime)-15s | %(levelname)-8s | [%(name)s] %(message)s" ) | |
loop = asyncio.new_event_loop() | |
register_graceful_shutdown(loop) | |
t = loop.create_task(dumb_task()) | |
try: | |
loop.run_forever() | |
finally: | |
loop.close() | |
logging.info("Goodbye!") | |
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""" On SIGINT
2022-10-28 11:23:58,233 | DEBUG | [asyncio] Using selector: EpollSelector
2022-10-28 11:23:58,234 | INFO | [root] dumb task
2022-10-28 11:23:59,236 | INFO | [root] dumb task
^C2022-10-28 11:23:59,745 | INFO | [root] SIGNAL (SIGINT)
2022-10-28 11:23:59,745 | INFO | [root] Closing tasks...
2022-10-28 11:23:59,746 | INFO | [root] Closing 1 tasks...
2022-10-28 11:23:59,746 | INFO | [root] dumb task is cleaning up itself
2022-10-28 11:24:00,748 | INFO | [root] Goodbye!
"""
""" On SIGTERM
2022-10-28 11:24:45,044 | DEBUG | [asyncio] Using selector: EpollSelector
2022-10-28 11:24:45,045 | INFO | [root] dumb task
2022-10-28 11:24:46,047 | INFO | [root] dumb task
2022-10-28 11:24:47,049 | INFO | [root] dumb task
2022-10-28 11:24:48,050 | INFO | [root] dumb task
2022-10-28 11:24:48,609 | INFO | [root] SIGNAL (SIGTERM)
2022-10-28 11:24:48,609 | INFO | [root] Closing tasks...
2022-10-28 11:24:48,609 | INFO | [root] Closing 1 tasks...
2022-10-28 11:24:48,609 | INFO | [root] dumb task is cleaning up itself
2022-10-28 11:24:49,611 | INFO | [root] Goodbye!
"""