Access the impl in interceptor

[wenerme]

Is your feature request related to a problem? Please describe.

I want to access the metadata for the impl from interceptor, seems this is impossible.

I want to get the spec.impl, it's even better to allowed access the service impl givend by router.service

connect-es/packages/connect/src/protocol/invoke-implementation.ts

Lines 39 to 71 in a9b4b83

	export async function invokeUnaryImplementation<
	I extends DescMessage,
	O extends DescMessage,
	>(
	spec: MethodImplSpec<I, O> & { kind: "unary" },
	context: HandlerContext,
	input: MessageShape<I>,
	interceptors: Interceptor[],
	): Promise<MessageShape<O>> {
	const anyFn = async (
	req: UnaryRequest<I, O>,
	): Promise<UnaryResponse<I, O>> => {
	return {
	message: normalize(
	spec.method.output,
	await spec.impl(req.message, mergeRequest(context, req)),
	),
	stream: false,
	method: spec.method,
	...responseCommon(context, spec),
	};
	};
	const next = applyInterceptors(anyFn, interceptors);
	const { message, header, trailer } = await next({
	stream: false,
	message: input,
	method: spec.method,
	...requestCommon(context, spec),
	});
	copyHeaders(header, context.responseHeader);
	copyHeaders(trailer, context.responseTrailer);
	return message;
	}

Describe the solution you'd like

maybe allowed to change the spec.impl or put some magic in contextValues ?

Describe alternatives you've considered

give a proxy object for router.service, return warped func there

Additional context

For opt-in case, I have to add decorator for all methods, I hope I can do opt-out by check the auth in interceptor instead wrap the method when decorate.

@Auth()
class UserServiceImpl {
@AuthZ({})
 list(){
}
}


function getAuthZMeta(){
}