2.20. Signal

You can register async callback functions for specific events of an entrypoint.

2.20.1. pre_start

pre_start signal occurs on entrypoint starting up before any service has started.

from aiomisc import entrypoint, receiver

@receiver(entrypoint.PRE_START)
async def prepare_database(entrypoint, services):
  ...

with entrypoint() as loop:
    loop.run_forever()

2.20.2. post_start

post_start signal occurs next entrypoint starting up after all services have been started.

from aiomisc import entrypoint, receiver

@receiver(entrypoint.POST_START)
async def startup_notifier(entrypoint, services):
  ...

with entrypoint() as loop:
    loop.run_forever()

2.20.3. pre_stop

pre_stop signal occurs on entrypoint shutdown before any service have been stopped.

from aiomisc import entrypoint, receiver

@receiver(entrypoint.PRE_STOP)
async def shutdown_notifier(entrypoint):
  ...

with entrypoint() as loop:
    loop.run_forever()

2.20.4. post_stop

post_stop signal occurs on entrypoint shutdown after all services have been stopped.

from aiomisc import entrypoint, receiver

@receiver(entrypoint.POST_STOP)
async def cleanup(entrypoint):
  ...

with entrypoint() as loop:
    loop.run_forever()