go微服务框架

主要参考资料：

https://segmentfault.com/a/1190000017572032

consul

    - 安装

        参考：https://www.cnblogs.com/speeddog/p/7183943.html

        启动命令改为

            consul agent -data-dir=/usr/local/consuldatal -server -bootstrap -bind 127.0.0.1 -dev

            尝试设置为外网地址，被提示有错误，只好用回本地IP：

                Error starting agent: Failed to start Consul server: Failed to start RPC layer: listen tcp 外网IP:8300: bind: cannot assign requested address

       、

安装go-micro框架       

    - go get github.com/micro/micro

        隐含需要：

            git支持

                yum -y install git

            protoc支持

1git clone https://github.com/google/protobuf.git
2cd protobuf/
3git clone https://github.com/google/googlemock.git
4mv googlemock gmock
5./autogen.sh
6./configure
7make
8make check
9make install
10
11export LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/usr/local/lib64:/usr/lib64

代码编译

- proto文件

        - 文件

            proto/hello.proto

        - 内容

1syntax = "proto3";
2service Hello {
3    rpc Ping(Request) returns (Response) {}
4}
5
6message Request {
7    string name = 1;
8}
9
10message Response {
11    string msg = 1;
12}

        - 编译

            protoc --go_out=. --micro_out=. ./proto/hello.proto

        - 结果

            hello.micro.go  

            hello.pb.go  

- service

        - 文件

            services/hello.go

        - 内容

1package main
2
3import (
4    "context"
5    "fmt"
6    
7    proto "../proto"                           // 路径需指向上述 proto 文件所在目录
8    micro "github.com/micro/go-micro"
9)
10
11
12type Hello struct{}
13    func (h *Hello) Ping(ctx context.Context, req *proto.Request, res *proto.Response) error {
14    res.Msg = "Hello " + req.Name
15    return nil
16}
17
18func main() {
19    service := micro.NewService(
20        micro.Name("hellooo"), // 服务名称
21    )
22    service.Init()
23    proto.RegisterHelloHandler(service.Server(), new(Hello))
24    if err := service.Run(); err != nil {
25        fmt.Println(err)
26    }
27}

        - 运行

            go run services/hello.go

- client

        - 文件

            clients/helloclient.go

        - 内容

1package main
2
3import (
4    "context"
5    "fmt"
6    
7    proto "../proto"
8    micro "github.com/micro/go-micro"
9)
10
11func main() {
12    service := micro.NewService(micro.Name("hello.client")) // 客户端服务名称
13    service.Init()
14    helloservice := proto.NewHelloService("hellooo", service.Client())
15
16    res, err := helloservice.Ping(context.TODO(), &proto.Request{Name: "World ^_^"})
17    if err != nil {
18        fmt.Println(err)
19    }
20    fmt.Println(res.Msg)
21}

        - 运行

            go run clients/helloclient.go

FAQ：            

    Q：protoc-gen-go: program not found or is not executable

    A：

        需要加入环境变量

            在~/.bashrc 中加入，并使生效

            export PATH = "PATH:$GOPATH/bin"