本示例的目的是演示一个3层的用户服务架构，获取本节代码

3层服务架构：micro api->api service->backend service

• 网关 micro api: (localhost:8080) - http访问入口网关
• API层 api service: (io.github.entere.api.user) - 对外暴露的API服务
• 服务层 backend service: (io.github.entere.srv.user) - 内网的后台服务
  本节，我们先实现backend service 以下简称 srv

在 定义User原型

生成微服务骨架代码

cd micro-examples/part2
micro new user/srv --type=srv --alias=user --namespace=io.github.entere --gopath=false

修改vi user/srv/proto/user/user.proto中的内容,定义User原型

syntax = "proto3";

package io.github.entere.srv.user;
// import "google/protobuf/timestamp.proto";
service User {
    rpc QueryUserByID(QueryRequest) returns (QueryResponse) {}
}

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message UserInfo {
   string user_id = 1;
   string nickname = 2;
   string mobile = 3;
   string avatar_url = 4;
   int32 gender = 5;
   uint32 created_at = 6;
   uint32 updated_at = 7;
   // google.protobuf.Timestamp created_at = 6;
   // google.protobuf.Timestamp updated_at = 7;
}

message Error {
   string msg = 1;
   string info = 2;
}

message QueryRequest {
   string user_id = 1;

}

message QueryResponse {
   uint32 code = 1;
   Error error = 2;
   UserInfo data = 3;
}

上面我们定义了User服务的基本原型结构，包含用户信息UserInfo，请求QueryRequest与响应结构QueryResponse，还定义了查询用户的方法QueryUserByID。

下面我们生成类型与服务方法：

cd user/srv
protoc --proto_path=${GOPATH}/src:. --micro_out=. --go_out=. proto/user/user.proto

编写用户模型服务

vi handler/user.go

调整QueryUserByID方法：

package handler

import (
    "context"

user "github.com/entere/micro-examples/part2/user/srv/proto/user"
)

type User struct{}

// Call is a single request handler called via client.Call or the generated client code
func (e *User) QueryUserByID(ctx context.Context, req *user.QueryRequest, rsp *user.QueryResponse) error {

userID := req.UserId
    if userID == "" {
        userID = "xxxxxx"
    }
    userInfo := &user.UserInfo{
        UserId:    userID,
        Nickname:  "匿名",
        Mobile: "138********",
        AvatarUrl: "avatar.jpg",
        Gender:    1,
    }
    rsp.Code = 200
    rsp.Error = nil
    rsp.Data = userInfo

return nil
}

修改main.go 注册微服务

vi main.go

package main

import (
    "github.com/entere/micro-examples/part2/user/srv/handler"
    "github.com/micro/go-micro"
    "github.com/micro/go-micro/util/log"

user "github.com/entere/micro-examples/part2/user/srv/proto/user"
)

func main() {
    // 新建服务
    service := micro.NewService(
        micro.Name("io.github.entere.srv.user"),
        micro.Version("latest"),
    )

// 初始化服务

service.Init()

// 注册服务
    user.RegisterUserHandler(service.Server(), new(handler.User))

// 启动服务
    if err := service.Run(); err != nil {
        log.Fatal(err)
    }
}

make build
./user-srv

micro  call io.github.entere.srv.user User.QueryUserByID '{"user_id":"543987654"}'

{
        "code": 200,
        "data": {
                "user_id": "543987654",
                "nickname": "匿名",
                "mobile": "138********",
                "avatar_url": "avatar.jpg",
                "gender": 1
        }
}