add cancel_reason to RpcInvocationData - #809
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in order to allow downstream interceptors/tracing to determine why the call was not successful.
davidzhao
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cloudwebrtc,
lukasIO and
xianshijing-lk
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September 9, 2026 05:39
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| # only a cancel the chain accepted counts: cancel() is False when the chain has | ||
| # already finished, which can happen in the same loop iteration the timer fires | ||
| # while this task has not resumed yet; that result is the caller's, not a timeout | ||
| invocation.cancel_reason = RpcError.ErrorCode.RESPONSE_TIMEOUT |
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🟡 Concurrent disconnect records wrong reason
When a room disconnect races the response deadline, cancel_reason reports RESPONSE_TIMEOUT while the caller receives RECIPIENT_DISCONNECTED. The deadline cancels the chain before the outer task handles the disconnect and replaces the reason.
Prompt for agents
Resolve cancellation precedence in LocalParticipant._run_incoming_chain so RpcInvocationData.cancel_reason observed during interceptor unwinding always matches the RpcError returned to the caller. A deadline callback can currently cancel the chain and expose RESPONSE_TIMEOUT before concurrent cancellation of the outer invocation enters the disconnect branch, which later returns RECIPIENT_DISCONNECTED. Add a deterministic race test covering both events in the same loop turn and coordinate the selected outcome before exposing the reason to the chain.
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cloudwebrtc
approved these changes
Sep 9, 2026
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in order to allow downstream interceptors/tracing to determine why the call was not successful.