How to define a global error handler in gRPC python

Question

Im trying to catch any exception that is raised in any servicer so I can make sure that I only propagate known exceptions and not unexpected ones like ValueError, TypeError etc.

Answer 1

gRPC Python currently don't support server-side global error handler. The interceptor won't execute the server handler inside the intercept_service function, so there is no way to try/except.

Also, I found the gRPC Python server interceptor implementation is different from what they proposed original at L13-Python-Interceptors.md#server-interceptors. If the implementation stick to the original design, we can use interceptor as global error handler easily with handler and request/request_iterator.

# Current Implementation
intercept_service(self, continuation, handler_call_details)

# Original Design
intercept_unary_unary_handler(self, handler, method, request, servicer_context)
intercept_unary_stream_handler(self, handler, method, request, servicer_context)
intercept_stream_unary_handler(self, handler, method, request_iterator, servicer_context)
intercept_stream_stream_handler(self, handler, method, request_iterator, servicer_context)

Please submit a feature request issue to https://github.com/grpc/grpc/issues.