Pass the type of client to GrpcClientFactoryOptions.Creator to activate

[mayuki]

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

Currently, GrpcClientFactoryOptions.Creator can implement custom client generation, but the client type is not passed to the Creator delegate, so we cannot generate a custom client.

The default activation process is to pass a type parameter to the IServiceProvider when requesting a DefaultClientActivator, so the client type is passed to the DefaultClientActivator. https://github.com/grpc/grpc-dotnet/blob/bf26e0377abfa86f34778ee1347565f02d90ffb5/src/Grpc.Net.ClientFactory/Internal/DefaultGrpcClientFactory.cs#L50

Describe the solution you'd like

We want to receive the client's type in a custom delegate or make ClientActivator service replaceable.

public Func<CallInvoker, Type, object>? Creator { get; set; }

var c = clientFactoryOptions.Creator(callInvoker, typeof(TClient));

Additional context

Our MagicOnion project relies on Grpc.Net, but has its own implementation at the client layer.

[JamesNK]

The Type isn't passed into that method, but you could get a reference it via closure.

The Creator property was added for protobuf-net. Could you follow what they do to get the type reference: https://github.com/protobuf-net/protobuf-net.Grpc/pull/80/files

[mayuki]

Sure, the type can be captured at registration time, and I can fix the problem.

However, considering the behaviour of DefaultClientActivator<TClient> and a scenario of creating clients dynamically, I think it's not a bad idea to pass the client type to Creator.