protoc-gen-micro

This is protobuf code generation for micro. We use protoc-gen-micro to reduce boilerplate code.

We previously maintained a fork of golang/protobuf to include the micro plugin but have since moved to protoc-gen-micro.

Install

go get github.com/micro/protoc-gen-micro

Also required:

Usage

Define your service as greeter.proto

syntax = "proto3";

service Greeter {
	rpc Hello(Request) returns (Response) {}
}

message Request {
	string name = 1;
}

message Response {
	string msg = 1;
}

Generate the code

protoc --proto_path=$GOPATH/src:. --micro_out=. --go_out=. greeter.proto

Your output result should be:

./
    greeter.proto	# original protobuf file
    greeter.pb.go	# auto-generated by protoc-gen-go
    greeter.micro.go	# auto-generated by protoc-gen-micro

The micro generated code includes clients and handlers which reduce boiler plate code

Server

type Greeter struct{}

func (g *Greeter) Hello(ctx context.Context, req *proto.Request, rsp *proto.Response) error {
	rsp.Msg = "Hello " + req.Name
	return nil
}

proto.RegisterGreeterHandler(service.Server(), &Greeter{})

Client

Create a service client with your micro client

client := proto.NewGreeterService("greeter", service.Client())

Errors

If you see an error about protoc-gen-micro not being found or executable, it's likely your environment may not be configured correctly. If you've already installed protoc, protoc-gen-go, and protoc-gen-micro ensure you've included $GOPATH/bin in your PATH.

Alternative specify the Go plugin paths as arguments to the protoc command

protoc --plugin=protoc-gen-go=$GOPATH/bin/protoc-gen-go --plugin=protoc-gen-micro=$GOPATH/bin/protoc-gen-micro --proto_path=$GOPATH/src:. --micro_out=. --go_out=. greeter.proto

LICENSE

protoc-gen-micro is a liberal reuse of protoc-gen-go hence we maintain the original license