gRPC and Global Exception Mappers

[senthilredhat]

I am looking for a custom exception mapper for gRPC in Quarkus similar to @ServerExceptionMapper for JAX-RS. Any solution around global exception handling in gRPC and Quarkus would be helpful. Thank you.

[quarkus-bot[bot]]

/cc @cescoffier, @michalszynkiewicz

[cescoffier]

We don't have such a feature yet. Can you open an issue and explain what kind of API you have in mind?

[senthilredhat]

Sure, I will create an issue with my thoughts.
-Thank you.

[elrob]

I found this after being frustrated that attempts to return custom exceptions and map them to grpc StatusRuntimeException in an interceptor require:

1. Extracting the original exception from the cause of the StatusRuntimeException in the interceptor
2. Putting up with this warning log:

   quarkus/extensions/grpc/stubs/src/main/java/io/quarkus/grpc/stubs/ServerCalls.java

   Line 230 in a4a9c39

   log.warn("gRPC service threw an exception other than StatusRuntimeException", throwable);

My solution was to have my custom exception extend StatusRuntimeException with the status and description of my choosing.

It would be great if there was a way (similar to @ServerExceptionMapper) which could be utilized map exceptions globally before this call:

quarkus/extensions/grpc/stubs/src/main/java/io/quarkus/grpc/stubs/ServerCalls.java

Line 219 in a4a9c39

private static Throwable toStatusFailure(Throwable throwable) {

[cescoffier]

Yes, @alesj will look into that for the "new" gRPC server.

[elrob]

Thank you!
It's not a huge issue but it feels like I'm conflating things which should be separate concerns when I make a business-logic exception extend the gRPC StatusRuntimeException

[elrob]

This seems to have been implemented and released with v 2.16.0.Latest
PR: #29419
Issue: #28609