cactuaroid / protoc-gen-myplugincsharp

protoc plugin sample in C#

protoc (Protocol Buffers Compiler) plugin sample in C#. protoc gives parsed input .proto to the plugin as CodeGeneratorRequest object via standard input. The plugin shall put CodeGeneratorResponse object to standard output to generate text file.

You cannot execute the plugin itself but you can attach debugger by calling System.Diagnostics.Debugger.Launch().

See https://github.com/cactuaroid/protoc-gen-opcua for further example.

Input chat.proto¹

syntax = "proto3";

// well known types
import "google/protobuf/timestamp.proto";
import "google/protobuf/empty.proto";

option csharp_namespace = "GrpcChatSample.Common";

package GrpcChatSample.Common;

service Chat {
  rpc Write(ChatLog) returns (google.protobuf.Empty) {}
  rpc Subscribe(google.protobuf.Empty) returns (stream ChatLog) {}
}

message ChatLog {
	string name = 1;
	string content = 2;
	google.protobuf.Timestamp at = 3;
}

Command Line

protoc.exe --plugin=protoc-gen-myplugincsharp.exe --myplugincsharp_out=./ --proto_path=%userprofile%\.nuget\packages\google.protobuf.tools\3.21.1\tools --proto_path=./ chat.proto

Output chat.proto.txt

service Cha
   .google.protobuf.Empty Write(.GrpcChatSample.Common.ChatLog)
   .GrpcChatSample.Common.ChatLog Subscribe(.google.protobuf.Empty)
message Timestamp
    seconds
    nanos
message Empty
message ChatLog
    name
    content
   .google.protobuf.Timestamp at

Footnotes

1. https://github.com/cactuaroid/GrpcWpfSample/blob/master/grpc-dotnet/GrpcChatSample2.Common/chat.proto ↩