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AutoErrorEventMiddleware emits {OriginalEventType}ErrorEvent when a handler completes with an error.

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Constructor params

None.

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Setup with EventBus

from abxbus import EventBus
from abxbus.middlewares import AutoErrorEventMiddleware

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

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Behavior

  • Runs on completed handler results.
  • If a handler errored, emits an auto event with:
    • event_type: {OriginalEventType}ErrorEvent
    • error: original exception
    • error_type: exception class name
  • Skips source events ending in ErrorEvent or ResultEvent to prevent auto recursion.