protobuf-net.Grpc | GRPC bindings for protobuf-net and grpc-dotnet

i try to use a custom protobuf-net RuntimeTypeModel with the protobuf-net grpc client library. What I understand so far, I need to to use the ClientFactory and set a binder-configuration which references my RuntimeTypeModel-Instance.

I'm using protobuf-net.Grpc on a .NET Core server and trying to make calls from a .NET Framework (4.7.2.) gRPC Client. A full example is here: https://github.com/angelagyang/GRPCProtobufExample

Here is a snippet of my client:

I am getting the following exception:

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100] Unhandled exception rendering component: The type initializer for 'DefaultProxyCache1' threw an exception. System.TypeInitializationException: The type initializer for 'DefaultProxyCache1' threw an exception. ---> System.ArgumentException: Invalid generic arguments Parameter name: typeArguments at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.MakeGenericMethod_impl(System.Reflection.RuntimeMethodInfo,System.Type[]) at System.Reflection.RuntimeMethodInfo.MakeGenericMethod (System.Type[] methodInstantiation) <0x342def8 + 0x000d6> in :0 at ProtoBuf.Grpc.Internal.ContractOperation.TryGetClientHelper () [0x0001b] in //src/protobuf-net.Grpc/Internal/ContractOperation.cs:291 at ProtoBuf.Grpc.Internal.ProxyEmitter.EmitFactory[TService] (ProtoBuf.Grpc.Configuration.BinderConfiguration binderConfig) [0x00477] in //src/protobuf-net.Grpc/Internal/ProxyEmitter.cs:238 at ProtoBuf.Grpc.Internal.ProxyEmitter.CreateFactory[TService] (ProtoBuf.Grpc.Configuration.BinderConfiguration binderConfig) [0x0006d] in //src/protobuf-net.Grpc/Internal/ProxyEmitter.cs:123 at ProtoBuf.Grpc.Configuration.ClientFactory+DefaultProxyCache`1[TService]..cctor () [0x00000] in //src/protobuf-net.Grpc/Configuration/ClientFactory.cs:81

My project uses gRPC-Web, Blazor web assembly and protobuf-net

This is my service contract:

I am using protobuf-net with protobuf-net.grpc and am attempting to get it to work on Xmarin/Ios.

Currently I have attempted to create a pre-compiled serializer:

I am upgrading an application from .Net FW to .Net Core. Also upgrading WCF services to gRPC services. We have decided to use protobuf-net.Grpc.

We use multiple levels of inheritance for service contracts.

I am experimenting with a gRPC service and client using proto files. The advice is to use gRPC client factory integration in .NET Core (https://docs.microsoft.com/en-us/aspnet/core/grpc/clientfactory?view=aspnetcore-3.1). To do this you register the client derived from Grpc.Core.ClientBase that is generated by the Grpc.Tools package, like this:

I'm currently working on replacing an old WCF client/server pairing with gRpc, and decided to use protobuf-net.Grpc as we've used protobuf-net extensively elsewhere in our codebase. I'm running into a bit of trouble with one particular portion however.

Part of the original service is a Subscribe method which uses IClientCallback to effectively send an event to the client. Looking at regular gRpc, it seems like this would be possible (though a bit hacky) using a server streaming method and storing the IServerStreamWriter object on the server, writing to it whenever we wanted to "fire an event".

For the life of me, however, I can't quite figure out how to do something similar in protobuf-net.Grpc with the IAsyncEnumerable return type. The closest I can figure is using Task.Wait in a loop and updating some shared collection when I want to "fire" the event, which the loop would then check for and yield return. This doesn't seem like it'd scale well, however, and there isn't really a great way to definitely unsubscribe when a client is no longer listening to events.

Is there some other/better way to do this?

So, recently I learned about how to do streaming with protobuf-net.grpc with the help of IAsyncEnumerable. This all works fine and dandy, but I'm facing a bit of an issue right now.

For some of my calls, I'd like to call with both some metadata as well as the stream as parameter.

For example: