带你十天轻松搞定 Go 微服务系列（四）

序言

我们通过一个系列文章跟大家详细展示一个 go-zero 微服务示例，整个系列分十篇文章，目录结构如下：

环境搭建
服务拆分
用户服务
产品服务（本文）
订单服务
支付服务
RPC 服务 Auth 验证
服务监控
链路追踪
分布式事务

期望通过本系列带你在本机利用 Docker 环境利用 go-zero 快速开发一个商城系统，让你快速上手微服务。

完整示例代码：https://github.com/nivin-studio/go-zero-mall

首先，我们来看一下整体的服务拆分图：

4. 产品服务（product）

进入服务工作区

$ cd mall/service/product

4.1 生成 product model 模型

创建 sql 文件

$ vim model/product.sql

编写 sql 文件

CREATE TABLE `product` (
	`id` bigint unsigned NOT NULL AUTO_INCREMENT,
	`name` varchar(255)  NOT NULL DEFAULT '' COMMENT '产品名称',
	`desc` varchar(255)  NOT NULL DEFAULT '' COMMENT '产品描述',
        `stock` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '产品库存',
	`amount` int(10) unsigned NOT NULL DEFAULT '0'  COMMENT '产品金额',
	`status` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '产品状态',
	`create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
	`update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
	PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8mb4;

运行模板生成命令

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

4.2 生成 product api 服务

创建 api 文件

$ vim api/product.api

编写 api 文件

type (
	// 产品创建
	CreateRequest {
		Name   string `json:"name"`
		Desc   string `json:"desc"`
		Stock  int64  `json:"stock"`
		Amount int64  `json:"amount"`
		Status int64  `json:"status"`
	}
	CreateResponse {
		Id int64 `json:"id"`
	}
	// 产品创建

	// 产品修改
	UpdateRequest {
		Id     int64  `json:"id"`
		Name   string `json:"name,optional"`
		Desc   string `json:"desc,optional"`
		Stock  int64  `json:"stock"`
		Amount int64  `json:"amount,optional"`
		Status int64  `json:"status,optional"`
	}
	UpdateResponse {
	}
	// 产品修改

	// 产品删除
	RemoveRequest {
		Id int64 `json:"id"`
	}
	RemoveResponse {
	}
	// 产品删除

	// 产品详情
	DetailRequest {
		Id int64 `json:"id"`
	}
	DetailResponse {
		Id     int64  `json:"id"`
		Name   string `json:"name"`
		Desc   string `json:"desc"`
		Stock  int64  `json:"stock"`
		Amount int64  `json:"amount"`
		Status int64  `json:"status"`
	}
	// 产品详情
)

@server(
	jwt: Auth
)
service Product {
	@handler Create
	post /api/product/create(CreateRequest) returns (CreateResponse)
	
	@handler Update
	post /api/product/update(UpdateRequest) returns (UpdateResponse)
	
	@handler Remove
	post /api/product/remove(RemoveRequest) returns (RemoveResponse)
	
	@handler Detail
	post /api/product/detail(DetailRequest) returns (DetailResponse)
}

运行模板生成命令

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

4.3 生成 product rpc 服务

创建 proto 文件

$ vim rpc/product.proto

编写 proto 文件

syntax = "proto3";

package productclient;

option go_package = "product";

// 产品创建
message CreateRequest {
    string Name = 1;
    string Desc = 2;
    int64 Stock = 3;
    int64 Amount = 4;
    int64 Status = 5;
}
message CreateResponse {
	int64 id = 1;
}
// 产品创建

// 产品修改
message UpdateRequest {
    int64 id = 1;
    string Name = 2;
    string Desc = 3;
    int64 Stock = 4;
    int64 Amount = 5;
    int64 Status = 6;
}
message UpdateResponse {
}
// 产品修改

// 产品删除
message RemoveRequest {
    int64 id = 1;
}
message RemoveResponse {
}
// 产品删除

// 产品详情
message DetailRequest {
    int64 id = 1;
}
message DetailResponse {
    int64 id = 1;
    string Name = 2;
    string Desc = 3;
    int64 Stock = 4;
    int64 Amount = 5;
    int64 Status = 6;
}
// 产品详情

service Product {
    rpc Create(CreateRequest) returns(CreateResponse);
    rpc Update(UpdateRequest) returns(UpdateResponse);
    rpc Remove(RemoveRequest) returns(RemoveResponse);
    rpc Detail(DetailRequest) returns(DetailResponse);
}

运行模板生成命令

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

4.4 编写 product rpc 服务

4.4.1 修改配置文件

修改 product.yaml 配置文件

$ vim rpc/etc/product.yaml

修改服务监听地址，端口号为0.0.0.0:9001，Etcd 服务配置，Mysql 服务配置，CacheRedis 服务配置

Name: product.rpc
ListenOn: 0.0.0.0:9001

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

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

CacheRedis:
- Host: redis:6379
  Type: node # node可以不写，可以设为cluster
  # Pass: xxx # 如果有密码

4.4.2 添加 product model 依赖

添加 Mysql 服务配置，CacheRedis 服务配置的实例化

$ 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
}

注册服务上下文 product model 的依赖

$ vim rpc/internal/svc/servicecontext.go

package svc

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

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

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

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

4.4.3 添加产品创建逻辑 Create

$ vim rpc/internal/logic/createlogic.go

package logic

import (
	"context"

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

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

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

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

func (l *CreateLogic) Create(in *product.CreateRequest) (*product.CreateResponse, error) {
	newProduct := model.Product{
		Name:   in.Name,
		Desc:   in.Desc,
		Stock:  in.Stock,
		Amount: in.Amount,
		Status: in.Status,
	}

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

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

	return &product.CreateResponse{
		Id: newProduct.Id,
	}, nil
}

4.4.4 添加产品详情逻辑 Detail

$ vim rpc/internal/logic/detaillogic.go

package logic

import (
	"context"

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

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

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

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

func (l *DetailLogic) Detail(in *product.DetailRequest) (*product.DetailResponse, error) {
	// 查询产品是否存在
	res, err := l.svcCtx.ProductModel.FindOne(in.Id)
	if err != nil {
		if err == model.ErrNotFound {
			return nil, status.Error(100, "产品不存在")
		}
		return nil, status.Error(500, err.Error())
	}

	return &product.DetailResponse{
		Id:     res.Id,
		Name:   res.Name,
		Desc:   res.Desc,
		Stock:  res.Stock,
		Amount: res.Amount,
		Status: res.Status,
	}, nil
}

4.4.5 添加产品更新逻辑 Update

$ vim rpc/internal/logic/updatelogic.go

package logic

import (
	"context"

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

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

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

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

func (l *UpdateLogic) Update(in *product.UpdateRequest) (*product.UpdateResponse, error) {
	// 查询产品是否存在
	res, err := l.svcCtx.ProductModel.FindOne(in.Id)
	if err != nil {
		if err == model.ErrNotFound {
			return nil, status.Error(100, "产品不存在")
		}
		return nil, status.Error(500, err.Error())
	}

	if in.Name != "" {
		res.Name = in.Name
	}
	if in.Desc != "" {
		res.Desc = in.Desc
	}
	if in.Stock != 0 {
		res.Stock = in.Stock
	}
	if in.Amount != 0 {
		res.Amount = in.Amount
	}
	if in.Status != 0 {
		res.Status = in.Status
	}

	err = l.svcCtx.ProductModel.Update(res)
	if err != nil {
		return nil, status.Error(500, err.Error())
	}

	return &product.UpdateResponse{}, nil
}

4.4.6 添加产品删除逻辑 Remove

$ vim rpc/internal/logic/removelogic.go

package logic

import (
	"context"

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

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

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

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

func (l *RemoveLogic) Remove(in *product.RemoveRequest) (*product.RemoveResponse, error) {
	// 查询产品是否存在
	res, err := l.svcCtx.ProductModel.FindOne(in.Id)
	if err != nil {
		if err == model.ErrNotFound {
			return nil, status.Error(100, "产品不存在")
		}
		return nil, status.Error(500, err.Error())
	}

	err = l.svcCtx.ProductModel.Delete(res.Id)
	if err != nil {
		return nil, status.Error(500, err.Error())
	}

	return &product.RemoveResponse{}, nil
}

4.5 编写 product api 服务

4.5.1 修改配置文件

修改 product.yaml 配置文件

$ vim api/etc/product.yaml

修改服务地址，端口号为0.0.0.0:8001，Mysql 服务配置，CacheRedis 服务配置，Auth 验证配置

Name: Product
Host: 0.0.0.0
Port: 8001

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

CacheRedis:
- Host: redis:6379
  Type: node # node可以不写，可以设为cluster
  # Pass: xxx # 如果有密码

Auth:
  AccessSecret: uOvKLmVfztaXGpNYd4Z0I1SiT7MweJhl
  AccessExpire: 86400

4.5.2 添加 product rpc 依赖

添加 product rpc 服务配置

$ vim api/etc/product.yaml

Name: Product
Host: 0.0.0.0
Port: 8001
...
ProductRpc:
  Etcd:
    Hosts:
    - etcd:2379
    Key: product.rpc

添加 product rpc 服务配置的实例化

$ 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
	}

	ProductRpc zrpc.RpcClientConf
}

注册服务上下文 product rpc 的依赖

$ vim api/internal/svc/servicecontext.go

package svc

import (
	"mall/service/product/api/internal/config"
	"mall/service/product/rpc/productclient"

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

type ServiceContext struct {
	Config config.Config
    
	ProductRpc productclient.Product
}

func NewServiceContext(c config.Config) *ServiceContext {
	return &ServiceContext{
		Config:     c,
		ProductRpc: productclient.NewProduct(zrpc.MustNewClient(c.ProductRpc)),
	}
}

4.5.3 添加产品创建逻辑 Create

$ vim api/internal/logic/createlogic.go

package logic

import (
	"context"

	"mall/service/product/api/internal/svc"
	"mall/service/product/api/internal/types"
	"mall/service/product/rpc/product"

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

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

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

func (l *CreateLogic) Create(req types.CreateRequest) (resp *types.CreateResponse, err error) {
	res, err := l.svcCtx.ProductRpc.Create(l.ctx, &product.CreateRequest{
		Name:   req.Name,
		Desc:   req.Desc,
		Stock:  req.Stock,
		Amount: req.Amount,
		Status: req.Status,
	})
	if err != nil {
		return nil, err
	}

	return &types.CreateResponse{
		Id: res.Id,
	}, nil
}

4.5.4 添加产品详情逻辑 Detail

$ vim api/internal/logic/detaillogic.go

package logic

import (
	"context"

	"mall/service/product/api/internal/svc"
	"mall/service/product/api/internal/types"
	"mall/service/product/rpc/product"

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

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

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

func (l *DetailLogic) Detail(req types.DetailRequest) (resp *types.DetailResponse, err error) {
	res, err := l.svcCtx.ProductRpc.Detail(l.ctx, &product.DetailRequest{
		Id: req.Id,
	})
	if err != nil {
		return nil, err
	}

	return &types.DetailResponse{
		Id:     res.Id,
		Name:   res.Name,
		Desc:   res.Desc,
		Stock:  res.Stock,
		Amount: res.Amount,
		Status: res.Status,
	}, nil
}

4.5.5 添加产品更新逻辑 Update

$ vim api/internal/logic/updatelogic.go

package logic

import (
	"context"

	"mall/service/product/api/internal/svc"
	"mall/service/product/api/internal/types"
	"mall/service/product/rpc/product"

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

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

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

func (l *UpdateLogic) Update(req types.UpdateRequest) (resp *types.UpdateResponse, err error) {
	_, err = l.svcCtx.ProductRpc.Update(l.ctx, &product.UpdateRequest{
		Id:     req.Id,
		Name:   req.Name,
		Desc:   req.Desc,
		Stock:  req.Stock,
		Amount: req.Amount,
		Status: req.Status,
	})
	if err != nil {
		return nil, err
	}

	return &types.UpdateResponse{}, nil
}

4.5.6 添加产品删除逻辑 Remove

$ vim api/internal/logic/removelogic.go

package logic

import (
	"context"

	"mall/service/product/api/internal/svc"
	"mall/service/product/api/internal/types"
	"mall/service/product/rpc/product"

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

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

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

func (l *RemoveLogic) Remove(req types.RemoveRequest) (resp *types.RemoveResponse, err error) {
	_, err = l.svcCtx.ProductRpc.Remove(l.ctx, &product.RemoveRequest{
		Id: req.Id,
	})
	if err != nil {
		return nil, err
	}

	return &types.RemoveResponse{}, nil
}

4.6 启动 product rpc 服务

提示：启动服务需要在 golang 容器中启动

$ cd mall/service/product/rpc
$ go run product.go -f etc/product.yaml
Starting rpc server at 127.0.0.1:9001...

4.7 启动 product api 服务

提示：启动服务需要在 golang 容器中启动

$ cd mall/service/product/api
$ go run product.go -f etc/product.yaml
Starting server at 0.0.0.0:8001...

项目地址

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

欢迎使用 go-zero 并 star 支持我们！

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原文地址：https://www.cnblogs.com/kevinwan/p/15843027.html