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AutoReturnEventMiddleware emits {OriginalEventType}ResultEvent for successful non-None handler return values.

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Constructor params

None.

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Setup with EventBus

from bubus import EventBus
from bubus.middlewares import AutoReturnEventMiddleware

bus = EventBus(
    name='AppBus',
    middlewares=[AutoReturnEventMiddleware()],
)

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Behavior

  • Runs on completed handler results.
  • Emits auto result events only when:
    • handler returned a non-None value
    • handler did not error
    • return value is not itself a BaseEvent
  • Auto event payload uses data=<handler_return_value>.
  • Skips source events ending in ErrorEvent or ResultEvent.