AutoReturnEventMiddleware - abxbus

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

Constructor params

None.

Setup with EventBus

Python
Rust

from abxbus import EventBus
from abxbus.middlewares import AutoReturnEventMiddleware

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

// Not implemented in the Rust crate yet.
// Use explicit typed handler wrappers around bus.on(...) for this behavior for now.

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.