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Add ServiceSwitcherStrategyFailover for automatic failover on service errors (#3870)

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* Add ServiceSwitcherStrategyFailover for automatic error-based service switching

Introduce a strategy hierarchy: ServiceSwitcherStrategy (base) →
ServiceSwitcherStrategyManual (handles ManuallySwitchServiceFrame) →
ServiceSwitcherStrategyFailover (adds error-based failover). ServiceSwitcher
now defaults to ServiceSwitcherStrategyManual with strategy_type optional.
Non-fatal ErrorFrames are forwarded to the strategy via handle_error().

* Move metadata request into _set_active_if_available

Requesting metadata is part of making a service active, so it belongs
alongside setting _active_service and firing on_service_switched. This
removes the duplicate queue_frame calls from ServiceSwitcher push_frame
and process_frame.
This commit is contained in:
kollaikal-rupesh
2026-03-10 12:37:30 -07:00
committed by GitHub
parent 43a9e9a1b5
commit 80bd935c19
6 changed files with 264 additions and 86 deletions
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- Added `ServiceSwitcherStrategyFailover` that automatically switches to the next service when the active service reports a non-fatal error. Recovery policies can be implemented via the `on_service_switched` event handler.

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- `ServiceSwitcherStrategy` base class now provides a `handle_error()` hook for subclasses to implement error-based switching. `ServiceSwitcher` defaults to `ServiceSwitcherStrategyManual` and `strategy_type` is now optional.