protoc-gen-micro

command module
Version: v2.0.0-...-bf4ab67 Latest Latest
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Published: Jan 5, 2021 License: Apache-2.0 Imports: 5 Imported by: 0

README

protoc-gen-micro

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

Install

go get github.com/micro/go-micro/cmd/protoc-gen-micro/v2

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

Register the handler with your micro 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
Endpoint

Add a micro API endpoint which routes directly to an RPC method

Usage:

  1. Clone github.com/googleapis/googleapis to use this feature as it requires http annotations.
  2. The protoc command must include -I$GOPATH/src/github.com/googleapis/googleapis for the annotations import.
syntax = "proto3";

import "google/api/annotations.proto";

service Greeter {
	rpc Hello(Request) returns (Response) {
		option (google.api.http) = { post: "/hello"; body: "*"; };
	}
}

message Request {
	string name = 1;
}

message Response {
	string msg = 1;
}

The proto generates a RegisterGreeterHandler function with a api.Endpoint.

func RegisterGreeterHandler(s server.Server, hdlr GreeterHandler, opts ...server.HandlerOption) error {
	type greeter interface {
		Hello(ctx context.Context, in *Request, out *Response) error
	}
	type Greeter struct {
		greeter
	}
	h := &greeterHandler{hdlr}
	opts = append(opts, api.WithEndpoint(&api.Endpoint{
		Name:    "Greeter.Hello",
		Path:    []string{"/hello"},
		Method:  []string{"POST"},
		Handler: "rpc",
	}))
	return s.Handle(s.NewHandler(&Greeter{h}, opts...))
}

LICENSE

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

Documentation

Overview

protoc-gen-micro is a plugin for the Google protocol buffer compiler to generate Go code. Run it by building this program and putting it in your path with the name

protoc-gen-micro

That word 'micro' at the end becomes part of the option string set for the protocol compiler, so once the protocol compiler (protoc) is installed you can run

protoc --micro_out=output_directory --go_out=output_directory input_directory/file.proto

to generate go-micro code for the protocol defined by file.proto. With that input, the output will be written to

output_directory/file.micro.go

The generated code is documented in the package comment for the library.

See the README and documentation for protocol buffers to learn more:

https://developers.google.com/protocol-buffers/

Source Files

Directories

Path Synopsis
examples
The code generator for the plugin for the Google protocol buffer compiler.
The code generator for the plugin for the Google protocol buffer compiler.
plugin

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