🔒 Grpc Python help

[covert juniper]

Would appreciate some help regarding how to add fields to metadata in interceptor and propagate the new metadata forward , have tried a couple of things but running into issues

[dusty hawk]

@covert juniper

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[fossil fulcrum]

What have you tried so far?

@covert juniper

[covert juniper]

try:
            updated_call_details = grpc.HandlerCallDetails(
                method=handler_call_details.method,
                invocation_metadata=new_metadata,
            )
        except Exception as e:
            print(e)
            raise e

apparently you cant create a new handlerCalldetails

HandlerCallDetails() takes no arguments

this is the error

specifically

[fossil fulcrum]

HandlerCallDetails is defined as an ABC (Abstract Base Model), so that makes sense.

This example in the grpc repo may help:
https://github.com/grpc/grpc/blob/ba9b36ff028404ac3167219086ab4bb23594ae89/examples/python/interceptors/headers/header_manipulator_client_interceptor.py

[covert juniper]

lemme check

[fossil fulcrum]

The above is actually used in an example like so: https://github.com/grpc/grpc/blob/ba9b36ff028404ac3167219086ab4bb23594ae89/examples/python/interceptors/headers/greeter_client.py#L26-L42

[covert juniper]

this is on the client side if i understand correctly?

i am trying to manipulate on the server side

[fossil fulcrum]

True. Look nearby in the same example directory.
https://github.com/grpc/grpc/blob/ba9b36ff028404ac3167219086ab4bb23594ae89/examples/python/interceptors/headers/greeter_server.py#L32-L46

[covert juniper]

yup checking there

[fossil fulcrum]

It creates a grpc.server with a tuple of interceptors, and includes the header_validator.

Kind of confusing to me how it's set up, but the source of that validator is here:
https://github.com/grpc/grpc/blob/master/examples/python/interceptors/headers/request_header_validator_interceptor.py

Basically it's a class you create that inherits grpc.ServerInterceptor, has a def intercept_service method defined, and then does things to its handler_call_details argument.

As you find, you don't create the details: they are passed to this method as an arg.

[covert juniper]

lemme check

[dusty hawk]

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