preface

We will show you a go zero micro service example in detail through a series of articles. The whole series is divided into ten articles, and the directory structure is as follows:

1. Environment construction
2. Service splitting
3. User services (this article)
4. Product service
5. Order service
6. Payment services
7. RPC service Auth authentication
8. Service monitoring
9. Link tracking
10. Distributed transaction

This series is expected to take you to quickly develop a mall system using go zero in the Docker environment on the machine, so that you can quickly start microservices.

Complete sample code: https://github.com/nivin-studio/go-zero-mall

First, mobile phone computer and the computer terminal are not synchronized with the official account of WeChat public.

3 User Service (user)

• Enter the service workspace

$ cd mall/service/user

3.1 generate user model

• Create sql file

$ vim model/user.sql

• Writing sql files

CREATE TABLE `user` (
  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(255)  NOT NULL DEFAULT '' COMMENT 'User name',
  `gender` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT 'User gender',
  `mobile` varchar(255)  NOT NULL DEFAULT '' COMMENT 'Subscriber telephone',
  `password` varchar(255)  NOT NULL DEFAULT '' COMMENT 'User password',
  `create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
  `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_mobile_unique` (`mobile`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8mb4;

• Run template generation command

$ goctl model mysql ddl -src ./model/user.sql -dir ./model -c

3.2 generate user api service

• Create api file

$ vim api/user.api

• Writing api files

type (
  // User login
  LoginRequest {
    Mobile   string `json:"mobile"`
    Password string `json:"password"`
  }
  LoginResponse {
    AccessToken  string `json:"accessToken"`
    AccessExpire int64  `json:"accessExpire"`
  }
  // User login

  // User registration
  RegisterRequest {
    Name     string `json:"name"`
    Gender   int64  `json:"gender"`
    Mobile   string `json:"mobile"`
    Password string `json:"password"`
  }
  RegisterResponse {
    Id     int64  `json:"id"`
    Name   string `json:"name"`
    Gender int64  `json:"gender"`
    Mobile string `json:"mobile"`
  }
  // User registration

  // User information
  UserInfoResponse {
    Id     int64  `json:"id"`
    Name   string `json:"name"`
    Gender int64  `json:"gender"`
    Mobile string `json:"mobile"`
  }
  // User information
)

service User {
  @handler Login
  post /api/user/login(LoginRequest) returns (LoginResponse)
  
  @handler Register
  post /api/user/register(RegisterRequest) returns (RegisterResponse)
}

@server(
  jwt: Auth
)
service User {
  @handler UserInfo
  post /api/user/userinfo() returns (UserInfoResponse)
}

• Run template generation command

$ goctl api go -api ./api/user.api -dir ./api

3.3 generate user rpc service

• Create proto file

$ vim rpc/user.proto

• Write proto file

syntax = "proto3";

package userclient;

option go_package = "user";

// User login
message LoginRequest {
    string Mobile = 1;
    string Password = 2;
}
message LoginResponse {
    int64 Id = 1;
    string Name = 2;
    int64 Gender = 3;
    string Mobile = 4;
}
// User login

// User registration
message RegisterRequest {
    string Name = 1;
    int64 Gender = 2;
    string Mobile = 3;
    string Password = 4;
}
message RegisterResponse {
    int64 Id = 1;
    string Name = 2;
    int64 Gender = 3;
    string Mobile = 4;
}
// User registration

// User information
message UserInfoRequest {
    int64 Id = 1;
}
message UserInfoResponse {
    int64 Id = 1;
    string Name = 2;
    int64 Gender = 3;
    string Mobile = 4;
}
// User information

service User {
    rpc Login(LoginRequest) returns(LoginResponse);
    rpc Register(RegisterRequest) returns(RegisterResponse);
    rpc UserInfo(UserInfoRequest) returns(UserInfoResponse);
}

• Run template generation command

$ goctl rpc proto -src ./rpc/user.proto -dir ./rpc

• Add and download dependent packages

  Go back to the root directory of the mall project and execute the following command:

$ go mod tidy

3.4 writing user rpc service

3.4.1 modify configuration file

• Modify user Yaml profile

$ vim rpc/etc/user.yaml

• Modify the service listening address, the port number is 0.0.0.0:9000, Etcd service configuration, Mysql service configuration and CacheRedis service configuration

Name: user.rpc
ListenOn: 0.0.0.0:9000

Etcd:
  Hosts:
  - etcd:2379
  Key: user.rpc

Mysql:
  DataSource: root:123456@tcp(mysql:3306)/mall?charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai

CacheRedis:
- Host: redis:6379
  Type: node
  Pass:

3.4.2 add user model dependency

• Add Mysql service configuration and instantiate CacheRedis service configuration

$ vim rpc/internal/config/config.go

package config

import (
  "github.com/tal-tech/go-zero/core/stores/cache"
  "github.com/tal-tech/go-zero/zrpc"
)

type Config struct {
  zrpc.RpcServerConf

  Mysql struct {
    DataSource string
  }
  
  CacheRedis cache.CacheConf
}

• Register the dependency of the service context user model

$ vim rpc/internal/svc/servicecontext.go

package svc

import (
  "mall/service/user/model"
  "mall/service/user/rpc/internal/config"

  "github.com/tal-tech/go-zero/core/stores/sqlx"
)

type ServiceContext struct {
  Config config.Config
    
  UserModel model.UserModel
}

func NewServiceContext(c config.Config) *ServiceContext {
  conn := sqlx.NewMysql(c.Mysql.DataSource)
  return &ServiceContext{
    Config:    c,
    UserModel: model.NewUserModel(conn, c.CacheRedis),
  }
}

3.4.3 add user registration logic Register

• Add password encryption tool

  Create a new crypt tool library in the root directory common. This tool method is mainly used for password encryption.

$ vim common/cryptx/crypt.go

package cryptx

import (
  "fmt"

  "golang.org/x/crypto/scrypt"
)

func PasswordEncrypt(salt, password string) string {
  dk, _ := scrypt.Key([]byte(password), []byte(salt), 32768, 8, 1, 32)
  return fmt.Sprintf("%x", string(dk))
}

• Add password encryption Salt configuration

$ vim rpc/etc/user.yaml

Name: user.rpc
ListenOn: 0.0.0.0:9000

...

Salt: HWVOFkGgPTryzICwd7qnJaZR9KQ2i8xe

$ vim rpc/internal/config/config.go

package config

import (
  "github.com/tal-tech/go-zero/core/stores/cache"
  "github.com/tal-tech/go-zero/zrpc"
)

type Config struct {
  ...
  Salt string
}

• Add user registration logic

  In the user registration process, first judge whether the registered mobile phone number has been registered, the mobile phone number has not been registered, write the user information into the database, and the user password needs to be encrypted and stored.

$ vim rpc/internal/logic/registerlogic.go

package logic

import (
  "context"

  "mall/common/cryptx"
  "mall/service/user/model"
  "mall/service/user/rpc/internal/svc"
  "mall/service/user/rpc/user"

  "github.com/tal-tech/go-zero/core/logx"
  "google.golang.org/grpc/status"
)

type RegisterLogic struct {
  ctx    context.Context
  svcCtx *svc.ServiceContext
  logx.Logger
}

func NewRegisterLogic(ctx context.Context, svcCtx *svc.ServiceContext) *RegisterLogic {
  return &RegisterLogic{
    ctx:    ctx,
    svcCtx: svcCtx,
    Logger: logx.WithContext(ctx),
  }
}

func (l *RegisterLogic) Register(in *user.RegisterRequest) (*user.RegisterResponse, error) {
  // Judge whether the mobile phone number has been registered
  _, err := l.svcCtx.UserModel.FindOneByMobile(in.Mobile)
  if err == nil {
    return nil, status.Error(100, "The user already exists")
  }

  if err == model.ErrNotFound {

    newUser := model.User{
      Name:     in.Name,
      Gender:   in.Gender,
      Mobile:   in.Mobile,
      Password: cryptx.PasswordEncrypt(l.svcCtx.Config.Salt, in.Password),
    }

    res, err := l.svcCtx.UserModel.Insert(&newUser)
    if err != nil {
      return nil, status.Error(500, err.Error())
    }

    newUser.Id, err = res.LastInsertId()
    if err != nil {
      return nil, status.Error(500, err.Error())
    }

    return &user.RegisterResponse{
      Id:     newUser.Id,
      Name:   newUser.Name,
      Gender: newUser.Gender,
      Mobile: newUser.Mobile,
    }, nil

  }

  return nil, status.Error(500, err.Error())
}

3.4.4 add user Login logic

The user login process determines whether the user is a registered user by querying the mobile phone number. If it is a registered user, the password entered by the user needs to be encrypted and compared with the user encryption password in the database.

$ vim rpc/internal/logic/loginlogic.go

package logic

import (
  "context"

  "mall/common/cryptx"
  "mall/service/user/model"
  "mall/service/user/rpc/internal/svc"
  "mall/service/user/rpc/user"

  "github.com/tal-tech/go-zero/core/logx"
  "google.golang.org/grpc/status"
)

type LoginLogic struct {
  ctx    context.Context
  svcCtx *svc.ServiceContext
  logx.Logger
}

func NewLoginLogic(ctx context.Context, svcCtx *svc.ServiceContext) *LoginLogic {
  return &LoginLogic{
    ctx:    ctx,
    svcCtx: svcCtx,
    Logger: logx.WithContext(ctx),
  }
}

func (l *LoginLogic) Login(in *user.LoginRequest) (*user.LoginResponse, error) {
  // Query whether the user exists
  res, err := l.svcCtx.UserModel.FindOneByMobile(in.Mobile)
  if err != nil {
    if err == model.ErrNotFound {
      return nil, status.Error(100, "user does not exist")
    }
    return nil, status.Error(500, err.Error())
  }

  // Determine whether the password is correct
  password := cryptx.PasswordEncrypt(l.svcCtx.Config.Salt, in.Password)
  if password != res.Password {
    return nil, status.Error(100, "Password error")
  }

  return &user.LoginResponse{
    Id:     res.Id,
    Name:   res.Name,
    Gender: res.Gender,
    Mobile: res.Mobile,
  }, nil
}

3.4.5 adding user information logic UserInfo

$ vim rpc/internal/logic/userinfologic.go

package logic

import (
  "context"

  "mall/service/user/model"
  "mall/service/user/rpc/internal/svc"
  "mall/service/user/rpc/user"

  "github.com/tal-tech/go-zero/core/logx"
  "google.golang.org/grpc/status"
)

type UserInfoLogic struct {
  ctx    context.Context
  svcCtx *svc.ServiceContext
  logx.Logger
}

func NewUserInfoLogic(ctx context.Context, svcCtx *svc.ServiceContext) *UserInfoLogic {
  return &UserInfoLogic{
    ctx:    ctx,
    svcCtx: svcCtx,
    Logger: logx.WithContext(ctx),
  }
}

func (l *UserInfoLogic) UserInfo(in *user.UserInfoRequest) (*user.UserInfoResponse, error) {
  // Query whether the user exists
  res, err := l.svcCtx.UserModel.FindOne(in.Id)
  if err != nil {
    if err == model.ErrNotFound {
      return nil, status.Error(100, "user does not exist")
    }
    return nil, status.Error(500, err.Error())
  }

  return &user.UserInfoResponse{
    Id:     res.Id,
    Name:   res.Name,
    Gender: res.Gender,
    Mobile: res.Mobile,
  }, nil
}

3.5 writing user api service

3.5.1 modify configuration file

• Modify user Yaml profile

$ vim api/etc/user.yaml

• Modify the service address, the port number is 0.0.0.0:8000, the Mysql service configuration, the CacheRedis service configuration, and the Auth authentication configuration

Name: User
Host: 0.0.0.0
Port: 8000

Mysql:
  DataSource: root:123456@tcp(mysql:3306)/mall?charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai

CacheRedis:
- Host: redis:6379
  Pass:
  Type: node

Auth:
  AccessSecret: uOvKLmVfztaXGpNYd4Z0I1SiT7MweJhl
  AccessExpire: 86400

3.5.2 add user rpc dependency

• Add user rpc service configuration

$ vim api/etc/user.yaml

Name: User
Host: 0.0.0.0
Port: 8000

......

UserRpc:
  Etcd:
    Hosts:
    - etcd:2379
    Key: user.rpc

• Add instantiation of user rpc service configuration

$ vim api/internal/config/config.go

package config

import (
  "github.com/tal-tech/go-zero/rest"
  "github.com/tal-tech/go-zero/zrpc"
)

type Config struct {
  rest.RestConf

  Auth struct {
    AccessSecret string
    AccessExpire int64
  }

  UserRpc zrpc.RpcClientConf
}

• Register service context user rpc dependency

$ vim api/internal/svc/servicecontext.go

package svc

import (
  "mall/service/user/api/internal/config"
  "mall/service/user/rpc/userclient"

  "github.com/tal-tech/go-zero/zrpc"
)

type ServiceContext struct {
  Config config.Config
    
  UserRpc userclient.User
}

func NewServiceContext(c config.Config) *ServiceContext {
  return &ServiceContext{
    Config:  c,
    UserRpc: userclient.NewUser(zrpc.MustNewClient(c.UserRpc)),
  }
}

3.5.3 add user registration logic Register

$ vim api/internal/logic/registerlogic.go

package logic

import (
  "context"

  "mall/service/user/api/internal/svc"
  "mall/service/user/api/internal/types"
  "mall/service/user/rpc/userclient"

  "github.com/tal-tech/go-zero/core/logx"
)

type RegisterLogic struct {
  logx.Logger
  ctx    context.Context
  svcCtx *svc.ServiceContext
}

func NewRegisterLogic(ctx context.Context, svcCtx *svc.ServiceContext) RegisterLogic {
  return RegisterLogic{
    Logger: logx.WithContext(ctx),
    ctx:    ctx,
    svcCtx: svcCtx,
  }
}

func (l *RegisterLogic) Register(req types.RegisterRequest) (resp *types.RegisterResponse, err error) {
  res, err := l.svcCtx.UserRpc.Register(l.ctx, &userclient.RegisterRequest{
    Name:     req.Name,
    Gender:   req.Gender,
    Mobile:   req.Mobile,
    Password: req.Password,
  })
  if err != nil {
    return nil, err
  }

  return &types.RegisterResponse{
    Id:     res.Id,
    Name:   res.Name,
    Gender: res.Gender,
    Mobile: res.Mobile,
  }, nil
}

3.5.4 add user Login logic

• Add JWT tool

  Create a new jwtx tool library in the root directory common to generate user token s.

$ vim common/jwtx/jwt.go

package jwtx

import "github.com/golang-jwt/jwt"

func GetToken(secretKey string, iat, seconds, uid int64) (string, error) {
  claims := make(jwt.MapClaims)
  claims["exp"] = iat + seconds
  claims["iat"] = iat
  claims["uid"] = uid
  token := jwt.New(jwt.SigningMethodHS256)
  token.Claims = claims
  return token.SignedString([]byte(secretKey))
}

• Add user login logic

  The user rpc service is called for login verification. After successful login, the user information is used to generate the corresponding token and the validity period of the token.

$ vim api/internal/logic/loginlogic.go

package logic

import (
  "context"
  "time"

  "mall/common/jwtx"
  "mall/service/user/api/internal/svc"
  "mall/service/user/api/internal/types"
  "mall/service/user/rpc/userclient"

  "github.com/tal-tech/go-zero/core/logx"
)

type LoginLogic struct {
  logx.Logger
  ctx    context.Context
  svcCtx *svc.ServiceContext
}

func NewLoginLogic(ctx context.Context, svcCtx *svc.ServiceContext) LoginLogic {
  return LoginLogic{
    Logger: logx.WithContext(ctx),
    ctx:    ctx,
    svcCtx: svcCtx,
  }
}

func (l *LoginLogic) Login(req types.LoginRequest) (resp *types.LoginResponse, err error) {
  res, err := l.svcCtx.UserRpc.Login(l.ctx, &userclient.LoginRequest{
    Mobile:   req.Mobile,
    Password: req.Password,
  })
  if err != nil {
    return nil, err
  }

  now := time.Now().Unix()
  accessExpire := l.svcCtx.Config.Auth.AccessExpire

  accessToken, err := jwtx.GetToken(l.svcCtx.Config.Auth.AccessSecret, now, accessExpire, res.Id)
  if err != nil {
    return nil, err
  }

  return &types.LoginResponse{
    AccessToken:  accessToken,
    AccessExpire: now + accessExpire,
  }, nil
}

3.5.5 adding user information logic UserInfo

$ vim api/internal/logic/userinfologic.go

package logic

import (
  "context"
  "encoding/json"

  "mall/service/user/api/internal/svc"
  "mall/service/user/api/internal/types"
  "mall/service/user/rpc/userclient"

  "github.com/tal-tech/go-zero/core/logx"
)

type UserInfoLogic struct {
  logx.Logger
  ctx    context.Context
  svcCtx *svc.ServiceContext
}

func NewUserInfoLogic(ctx context.Context, svcCtx *svc.ServiceContext) UserInfoLogic {
  return UserInfoLogic{
    Logger: logx.WithContext(ctx),
    ctx:    ctx,
    svcCtx: svcCtx,
  }
}

func (l *UserInfoLogic) UserInfo() (resp *types.UserInfoResponse, err error) {
  uid, _ := l.ctx.Value("uid").(json.Number).Int64()
  res, err := l.svcCtx.UserRpc.UserInfo(l.ctx, &userclient.UserInfoRequest{
    Id: uid,
  })
  if err != nil {
    return nil, err
  }

  return &types.UserInfoResponse{
    Id:     res.Id,
    Name:   res.Name,
    Gender: res.Gender,
    Mobile: res.Mobile,
  }, nil
}

Through l.ctx Value ("uid") can obtain the customized parameters in jwt token

3.6 start user rpc service

Tip: start the service in the golang container

$ cd mall/service/user/rpc
$ go run user.go -f etc/user.yaml
Starting rpc server at 127.0.0.1:9000...

3.7 start user api service

Tip: start the service in the golang container

$ cd mall/service/user/api
$ go run user.go -f etc/user.yaml
Starting server at 0.0.0.0:8000...

Project address

https://github.com/zeromicro/go-zero

https://gitee.com/kevwan/go-zero

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