帶你十天輕鬆搞定 Go 微服務系列(六)

語言: CN / TW / HK

序言

我們通過一個系列文章跟大家詳細展示一個 go-zero 微服務示例,整個系列分十篇文章,目錄結構如下:

  1. 環境搭建
  2. 服務拆分
  3. 使用者服務
  4. 產品服務
  5. 訂單服務
  6. 支付服務(本文)
  7. RPC 服務 Auth 驗證
  8. 服務監控
  9. 鏈路追蹤
  10. 分散式事務

期望通過本系列帶你在本機利用 Docker 環境利用 go-zero 快速開發一個商城系統,讓你快速上手微服務。

完整示例程式碼:https://github.com/nivin-studio/go-zero-mall

首先,我們來看一下整體的服務拆分圖:

6 支付服務(pay)

  • 進入服務工作區
$ cd mall/service/pay

6.1 生成 pay model 模型

  • 建立 sql 檔案
$ vim model/pay.sql
  • 編寫 sql 檔案
CREATE TABLE `pay` (
	`id` bigint unsigned NOT NULL AUTO_INCREMENT,
	`uid` bigint unsigned NOT NULL DEFAULT '0' COMMENT '使用者ID',
	`oid` bigint unsigned NOT NULL DEFAULT '0' COMMENT '訂單ID',
	`amount` int(10) unsigned NOT NULL DEFAULT '0'  COMMENT '產品金額',
	`source` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '支付方式',
	`status` tinyint(3) unsigned NOT NULL DEFAULT '0' COMMENT '支付狀態',
	`create_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
	`update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
	PRIMARY KEY (`id`),
	KEY `idx_uid` (`uid`),
	KEY `idx_oid` (`oid`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8mb4;
  • 執行模板生成命令
$ goctl model mysql ddl -src ./model/pay.sql -dir ./model -c

6.2 生成 pay api 服務

  • 建立 api 檔案
$ vim api/pay.api
  • 編寫 api 檔案
type (
	// 支付建立
	CreateRequest {
		Uid    int64 `json:"uid"`
		Oid    int64 `json:"oid"`
		Amount int64 `json:"amount"`
	}
	CreateResponse {
		Id int64 `json:"id"`
	}
	// 支付建立

	// 支付詳情
	DetailRequest {
		Id int64 `json:"id"`
	}
	DetailResponse {
		Id     int64 `json:"id"`
		Uid    int64 `json:"uid"`
		Oid    int64 `json:"oid"`
		Amount int64 `json:"amount"`
		Source int64 `json:"source"`
		Status int64 `json:"status"`
	}
	// 支付詳情

	// 支付回撥
	CallbackRequest {
		Id     int64 `json:"id"`
		Uid    int64 `json:"uid"`
		Oid    int64 `json:"oid"`
		Amount int64 `json:"amount"`
		Source int64 `json:"source"`
		Status int64 `json:"status"`
	}
	CallbackResponse {
	}
	// 支付回撥

)

@server(
	jwt: Auth
)
service Pay {
	@handler Create
	post /api/pay/create(CreateRequest) returns (CreateResponse)
	
	@handler Detail
	post /api/pay/detail(DetailRequest) returns (DetailResponse)
	
	@handler Callback
	post /api/pay/callback(CallbackRequest) returns (CallbackResponse)
}
  • 執行模板生成命令
$ goctl api go -api ./api/pay.api -dir ./api

6.3 生成 pay rpc 服務

  • 建立 proto 檔案
$ vim rpc/pay.proto
  • 編寫 proto 檔案
syntax = "proto3";

package payclient;

option go_package = "pay";

// 支付建立
message CreateRequest {
    int64 Uid = 1;
    int64 Oid = 2;
    int64 Amount = 3;
}
message CreateResponse {
	int64 id = 1;
}
// 支付建立

// 支付詳情
message DetailRequest {
    int64 id = 1;
}
message DetailResponse {
    int64 id = 1;
    int64 Uid = 2;
    int64 Oid = 3;
    int64 Amount = 4;
    int64 Source = 5;
    int64 Status = 6;
}
// 支付詳情

// 支付詳情
message CallbackRequest {
    int64 id = 1;
    int64 Uid = 2;
    int64 Oid = 3;
    int64 Amount = 4;
    int64 Source = 5;
    int64 Status = 6;
}
message CallbackResponse {
}
// 支付詳情


service Pay {
    rpc Create(CreateRequest) returns(CreateResponse);
    rpc Detail(DetailRequest) returns(DetailResponse);
    rpc Callback(CallbackRequest) returns(CallbackResponse);
}
  • 執行模板生成命令
$ goctl rpc proto -src ./rpc/pay.proto -dir ./rpc

6.4 編寫 pay rpc 服務

6.4.1 修改配置檔案

  • 修改 pay.yaml 配置檔案
$ vim rpc/etc/pay.yaml
  • 修改服務監聽地址,埠號為0.0.0.0:9003,Etcd 服務配置,Mysql 服務配置,CacheRedis 服務配置
Name: pay.rpc
ListenOn: 0.0.0.0:9003

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

Mysql:
  DataSource: root:[email protected](mysql:3306)/mall?charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai

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

6.4.2 新增 pay model 依賴

  • 新增 Mysql 服務配置,CacheRedis 服務配置的例項化
$ 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
}
  • 註冊服務上下文 pay model 的依賴
$ vim rpc/internal/svc/servicecontext.go
package svc

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

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

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

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

6.4.3 新增 user rpc,order rpc 依賴

  • 新增 user rpc, order rpc 服務配置
$ vim rpc/etc/pay.yaml
Name: pay.rpc
ListenOn: 0.0.0.0:9003
Etcd:
  Hosts:
  - etcd:2379
  Key: pay.rpc

...

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

OrderRpc:
  Etcd:
    Hosts:
    - etcd:2379
    Key: order.rpc
  • 新增 user rpc, order rpc 服務配置的例項化
$ 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

	UserRpc  zrpc.RpcClientConf
	OrderRpc zrpc.RpcClientConf
}
  • 註冊服務上下文 user rpc, order rpc 的依賴
$ vim rpc/internal/svc/servicecontext.go
package svc

import (
	"mall/service/order/rpc/orderclient"
	"mall/service/pay/model"
	"mall/service/pay/rpc/internal/config"
	"mall/service/user/rpc/userclient"

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

type ServiceContext struct {
	Config config.Config
    
	PayModel model.PayModel

	UserRpc  userclient.User
	OrderRpc orderclient.Order
}

func NewServiceContext(c config.Config) *ServiceContext {
	conn := sqlx.NewMysql(c.Mysql.DataSource)
	return &ServiceContext{
		Config:   c,
		PayModel: model.NewPayModel(conn, c.CacheRedis),
		UserRpc:  userclient.NewUser(zrpc.MustNewClient(c.UserRpc)),
		OrderRpc: orderclient.NewOrder(zrpc.MustNewClient(c.OrderRpc)),
	}
}

6.4.4 新增支付建立邏輯 Create

  • 新增根據 oid 查詢訂單支付記錄 PayModel 方法 FindOneByOid
$ vim model/paymodel.go
package model

...

var (
	...

	cachePayIdPrefix  = "cache:pay:id:"
	cachePayOidPrefix = "cache:pay:oid:"
)

type (
	PayModel interface {
		Insert(data *Pay) (sql.Result, error)
		FindOne(id int64) (*Pay, error)
		FindOneByOid(oid int64) (*Pay, error)
		Update(data *Pay) error
		Delete(id int64) error
	}

	...
)

...

func (m *defaultPayModel) FindOneByOid(oid int64) (*Pay, error) {
	payOidKey := fmt.Sprintf("%s%v", cachePayOidPrefix, oid)
	var resp Pay
	err := m.QueryRow(&resp, payOidKey, func(conn sqlx.SqlConn, v interface{}) error {
		query := fmt.Sprintf("select %s from %s where `oid` = ? limit 1", payRows, m.table)
		return conn.QueryRow(v, query, oid)
	})
	switch err {
	case nil:
		return &resp, nil
	case sqlc.ErrNotFound:
		return nil, ErrNotFound
	default:
		return nil, err
	}
}

......
  • 新增支付建立邏輯

    支付流水建立流程,通過呼叫 user rpc 服務查詢驗證使用者是否存在,再通過呼叫 order rpc 服務查詢驗證訂單是否存在,然後通過查詢庫判斷此訂單是否已經建立過支付流水,最後建立落庫。

$ vim rpc/internal/logic/createlogic.go
package logic

import (
	"context"

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

	"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 *pay.CreateRequest) (*pay.CreateResponse, error) {
	// 查詢使用者是否存在
	_, err := l.svcCtx.UserRpc.UserInfo(l.ctx, &user.UserInfoRequest{
		Id: in.Uid,
	})
	if err != nil {
		return nil, err
	}

	// 查詢訂單是否存在
	_, err = l.svcCtx.OrderRpc.Detail(l.ctx, &order.DetailRequest{
		Id: in.Oid,
	})
	if err != nil {
		return nil, err
	}

	// 查詢訂單是否已經建立支付
	_, err = l.svcCtx.PayModel.FindOneByOid(in.Oid)
	if err == nil {
		return nil, status.Error(100, "訂單已建立支付")
	}

	newPay := model.Pay{
		Uid:    in.Uid,
		Oid:    in.Oid,
		Amount: in.Amount,
		Source: 0,
		Status: 0,
	}

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

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

	return &pay.CreateResponse{
		Id: newPay.Id,
	}, nil
}

6.4.5 新增支付詳情邏輯 Detail

$ vim rpc/internal/logic/detaillogic.go
package logic

import (
	"context"

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

	"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 *pay.DetailRequest) (*pay.DetailResponse, error) {
	// 查詢支付是否存在
	res, err := l.svcCtx.PayModel.FindOne(in.Id)
	if err != nil {
		if err == model.ErrNotFound {
			return nil, status.Error(100, "支付不存在")
		}
		return nil, status.Error(500, err.Error())
	}

	return &pay.DetailResponse{
		Id:     res.Id,
		Uid:    res.Uid,
		Oid:    res.Oid,
		Amount: res.Amount,
		Source: res.Source,
		Status: res.Status,
	}, nil
}

6.4.6 新增支付回撥邏輯 Callback

支付流水回撥流程,通過呼叫 user rpc 服務查詢驗證使用者是否存在,再通過呼叫 order rpc 服務查詢驗證訂單是否存在,然後通過查詢庫判斷此訂單支付流水是否存在,以及回撥支付金額和庫中流水支付金額是否一致,最後更新支付流水狀態和通過呼叫 order rpc 服務更新訂單狀態。

$ vim rpc/internal/logic/callbacklogic.go
package logic

import (
	"context"

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

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

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

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

func (l *CallbackLogic) Callback(in *pay.CallbackRequest) (*pay.CallbackResponse, error) {
	// 查詢使用者是否存在
	_, err := l.svcCtx.UserRpc.UserInfo(l.ctx, &user.UserInfoRequest{
		Id: in.Uid,
	})
	if err != nil {
		return nil, err
	}

	// 查詢訂單是否存在
	_, err = l.svcCtx.OrderRpc.Detail(l.ctx, &order.DetailRequest{
		Id: in.Oid,
	})
	if err != nil {
		return nil, err
	}

	// 查詢支付是否存在
	res, err := l.svcCtx.PayModel.FindOne(in.Id)
	if err != nil {
		if err == model.ErrNotFound {
			return nil, status.Error(100, "支付不存在")
		}
		return nil, status.Error(500, err.Error())
	}
	// 支付金額與訂單金額不符
	if in.Amount != res.Amount {
		return nil, status.Error(100, "支付金額與訂單金額不符")
	}

	res.Source = in.Source
	res.Status = in.Status

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

	// 更新訂單支付狀態
	_, err = l.svcCtx.OrderRpc.Paid(l.ctx, &order.PaidRequest{
		Id: in.Oid,
	})
	if err != nil {
		return nil, status.Error(500, err.Error())
	}

	return &pay.CallbackResponse{}, nil
}

6.5 編寫 pay api 服務

6.5.1 修改配置檔案

  • 修改 pay.yaml 配置檔案
$ vim api/etc/pay.yaml
  • 修改服務地址,埠號為0.0.0.0:8003,Mysql 服務配置,CacheRedis 服務配置,Auth 驗證配置
Name: Pay
Host: 0.0.0.0
Port: 8003

Mysql:
  DataSource: root:[email protected](mysql:3306)/mall?charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai

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

Auth:
  AccessSecret: uOvKLmVfztaXGpNYd4Z0I1SiT7MweJhl
  AccessExpire: 86400

6.5.2 新增 pay rpc 依賴

  • 新增 pay rpc 服務配置
$ vim api/etc/pay.yaml
Name: Pay
Host: 0.0.0.0
Port: 8003

......

PayRpc:
  Etcd:
    Hosts:
    - etcd:2379
    Key: pay.rpc
  • 新增 pay rpc 服務配置的例項化
$ 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
	}

	PayRpc zrpc.RpcClientConf
}
  • 註冊服務上下文 pay rpc 的依賴
$ vim api/internal/svc/servicecontext.go
package svc

import (
	"mall/service/pay/api/internal/config"
	"mall/service/pay/rpc/payclient"

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

type ServiceContext struct {
	Config config.Config
    
	PayRpc payclient.Pay
}

func NewServiceContext(c config.Config) *ServiceContext {
	return &ServiceContext{
		Config: c,
		PayRpc: payclient.NewPay(zrpc.MustNewClient(c.PayRpc)),
	}
}

6.5.3 新增支付建立邏輯 Create

$ vim api/internal/logic/createlogic.go
package logic

import (
	"context"

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

	"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.PayRpc.Create(l.ctx, &pay.CreateRequest{
		Uid:    req.Uid,
		Oid:    req.Oid,
		Amount: req.Amount,
	})
	if err != nil {
		return nil, err
	}

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

6.5.4 新增支付詳情邏輯 Detail

$ vim api/internal/logic/detaillogic.go
package logic

import (
	"context"

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

	"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.PayRpc.Detail(l.ctx, &pay.DetailRequest{
		Id: req.Id,
	})
	if err != nil {
		return nil, err
	}

	return &types.DetailResponse{
		Id:     req.Id,
		Uid:    res.Uid,
		Oid:    res.Oid,
		Amount: res.Amount,
		Source: res.Source,
		Status: res.Status,
	}, nil
}

6.5.5 新增支付回撥邏輯 Callback

$ vim api/internal/logic/callbacklogic.go
package logic

import (
	"context"

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

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

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

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

func (l *CallbackLogic) Callback(req types.CallbackRequest) (resp *types.CallbackResponse, err error) {
	_, err = l.svcCtx.PayRpc.Callback(l.ctx, &pay.CallbackRequest{
		Id:     req.Id,
		Uid:    req.Uid,
		Oid:    req.Oid,
		Amount: req.Amount,
		Source: req.Source,
		Status: req.Status,
	})
	if err != nil {
		return nil, err
	}

	return &types.CallbackResponse{}, nil
}

6.6 啟動 pay rpc 服務

提示:啟動服務需要在 golang 容器中啟動

$ cd mall/service/pay/rpc
$ go run pay.go -f etc/pay.yaml
Starting rpc server at 127.0.0.1:9003...

6.7 啟動 pay api 服務

提示:啟動服務需要在 golang 容器中啟動

$ cd mall/service/pay/api
$ go run pay.go -f etc/pay.yaml
Starting server at 0.0.0.0:8003...

專案地址

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

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

歡迎使用 go-zerostar 支援我們!

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