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Allow None return from grpc.aio.ServerInterceptor.intercept_service #15783

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Allow None return from grpc.aio.ServerInterceptor.intercept_service #15783

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944efeb
Allow None return from grpc.aio.ServerInterceptor.intercept_service
Rhadamanthus1 May 12, 2026
81ea9c8
Update grpcio async ServerInterceptor test case for Optional return
Rhadamanthus1 May 12, 2026
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4 changes: 2 additions & 2 deletions stubs/grpcio/@tests/test_cases/check_server_interceptor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -26,9 +26,9 @@ def intercept_service(
class NoopAioInterceptor(grpc.aio.ServerInterceptor):
async def intercept_service(
self,
continuation: Callable[[grpc.HandlerCallDetails], Awaitable[grpc.RpcMethodHandler[RequestT, ResponseT]]],
continuation: Callable[[grpc.HandlerCallDetails], Awaitable[grpc.RpcMethodHandler[RequestT, ResponseT] | None]],
handler_call_details: grpc.HandlerCallDetails,
) -> grpc.RpcMethodHandler[RequestT, ResponseT]:
) -> grpc.RpcMethodHandler[RequestT, ResponseT] | None:
return await continuation(handler_call_details)


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7 changes: 5 additions & 2 deletions stubs/grpcio/grpc/aio/__init__.pyi
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Expand Up @@ -375,12 +375,15 @@ class ServerInterceptor(metaclass=abc.ABCMeta):
# This method (not the class) is generic over _TRequest and _TResponse
# and the types must satisfy the no-op implementation of
# `return await continuation(handler_call_details)`.
# The return is Optional: per the runtime docstring, an interceptor
# may return None to signal that the RPC is not serviced, and the
# continuation propagates that None down the chain.
@abc.abstractmethod
async def intercept_service(
self,
continuation: Callable[[HandlerCallDetails], Awaitable[RpcMethodHandler[_TRequest, _TResponse]]],
continuation: Callable[[HandlerCallDetails], Awaitable[RpcMethodHandler[_TRequest, _TResponse] | None]],
handler_call_details: HandlerCallDetails,
) -> RpcMethodHandler[_TRequest, _TResponse]: ...
) -> RpcMethodHandler[_TRequest, _TResponse] | None: ...

# Multi-Callable Interfaces:

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