I am using djangogrpcframework 0.2.1 and I am trying to write a interceptor to see if a key is present in the request metadata. I also log somethings to see the progress of the interceptor.

from grpc import ServerInterceptor, StatusCode


class CustomInterceptor(ServerInterceptor):

    def intercept_service(self, continuation, handler_call_details):
        print("start intercepting)
        metadata = handler_call_details.invocation_metadata

        if 'key' not in metadata:
            context = handler_call_details.invocation_metadata.context()
            context.abort(StatusCode.UNAVAILABLE, 'No key provided')

        return continuation(handler_call_details)

This class is located in path/to/CustomInterceptor. I have added this interceptor to my django project settings like this:

GRPC_FRAMEWORK = {
    'ROOT_HANDLERS_HOOK': 'project.urls.grpc_handlers',
    'SERVER_INTERCEPTORS': [
        'path.to.CustomInterceptor',
    ]
}

I run grpc server with the command:

python manage.py rungrpcserver

When trying to call any handler from a golang client to this server I do not see any log of the progress of interceptor, and I get the following error on my client

rpc error: code = Unknown desc = Error in service handler!

I already tried to see if the server has successfully imported the interceptor and that was not the problem.
I tried setting GRPC_VERBOSITY=DEBUG to see any log of error on my server but there was no log.