gateway

GRPC

Contains examples for using go-grpc

• greeter - A greeter example
• gateway - A grpc gateway example

New service

Check out the greeter example using go-grpc

Import go-grpc

import "github.com/micro/go-grpc"

Create micro.Service

service := grpc.NewService()

Pre-existing Service

What if you want to add grpc to a pre-existing service? Use the build pattern for plugins but swap out the client/server.

Create a plugin file

package main

import (
	"github.com/micro/go-micro/client"
	"github.com/micro/go-micro/server"
	cli "github.com/micro/go-plugins/client/grpc"
	srv "github.com/micro/go-plugins/server/grpc"
)

func init() {
	// set the default client
	client.DefaultClient = cli.NewClient()
	// set the default server
	server.DefaultServer = srv.NewServer()
}

Build the binary

// For local use
go build -i -o service ./main.go ./plugins.go

Run

Because the default client/server have been replaced we can just run as usual

./service

GRPC Gateway

gateway目录主要处理url访问的请求，通过grpc转发给对应的业务greeter，并返回相对应的结果。 项目代码参考grpc-ecosystem/grpc-gateway.
这部分依赖三个库

• protoc-gen-grpc-gateway
• protoc-gen-grpc-swagger
• protoc-gen-go

这三个目录在tools/framework_install.sh, 该脚本已经安装过，可以前往GOBIN目录查看，确定安装成功后

Services written with micro/go-grpc are fully compatible with the grpc-gateway and any other grpc services.

Usage

Run the go.micro.srv.greeter service

go run ../greeter/srv/main.go --server_address=localhost:9090

Run the gateway

go run main.go

Curl your request at the gateway (localhost:8080)

curl -d '{"name": "evan"}' http://localhost:8080/greeter/hello