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go: Fail-Fast Pattern

news 2026/7/1 2:01:29

项目结构：

/* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:25 # User : geovindu # Product : GoLand # Project : godesginpattern # File : fail_fast.go */ package exceptions type ResourceCheckFailedError struct { Msg string } func (e *ResourceCheckFailedError) Error() string { return e.Msg } func NewFailFastErr(msg string) error { return &ResourceCheckFailedError{Msg: msg} } /* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:26 # User : geovindu # Product : GoLand # Project : godesginpattern # File : inventory_repo.go */ package repository type InventoryRepository struct { stockMap map[string]int } func NewInventoryRepository() *InventoryRepository { repo := &InventoryRepository{ stockMap: make(map[string]int), } // 初始化测试库存 repo.stockMap["DIA001"] = 2 repo.stockMap["DIA002"] = 0 return repo } func (r *InventoryRepository) GetStock(productId string) int { val, ok := r.stockMap[productId] if !ok { return -1 } return val } func (r *InventoryRepository) DeductStock(productId string, qty int) { r.stockMap[productId] -= qty } /* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:27 # User : geovindu # Product : GoLand # Project : godesginpattern # File : external_services_repo.go */ package repository type ExternalServices struct { InventoryService bool PaymentGateway bool QualityInspection bool InvoiceService bool } func NewExternalServices() *ExternalServices { return &ExternalServices{ InventoryService: true, PaymentGateway: true, QualityInspection: true, InvoiceService: true, } } /* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:27 # User : geovindu # Product : GoLand # Project : godesginpattern # File : validation_service.go */ package service import ( "godesginpattern/failfast/exceptions" "godesginpattern/failfast/repository" ) type ValidationService struct { invRepo *repository.InventoryRepository extSvc *repository.ExternalServices } func NewValidationService(inv *repository.InventoryRepository, ext *repository.ExternalServices) *ValidationService { return &ValidationService{ invRepo: inv, extSvc: ext, } } func (v *ValidationService) FailFastCheck(customerId, productId string, quantity int) error { // 1. 顾客校验 if len(customerId) < 3 { return exceptions.NewFailFastErr("顾客信息无效，立即失败") } // 2. 商品是否存在 stock := v.invRepo.GetStock(productId) if stock == -1 { return exceptions.NewFailFastErr("商品不存在，立即失败") } // 3. 库存校验 if stock < quantity { return exceptions.NewFailFastErr("库存不足，立即失败") } // 4. 外部服务校验 if !v.extSvc.InventoryService { return exceptions.NewFailFastErr("库存服务不可用，立即失败") } if !v.extSvc.PaymentGateway { return exceptions.NewFailFastErr("支付网关不可用，立即失败") } if !v.extSvc.QualityInspection { return exceptions.NewFailFastErr("质检服务不可用，立即失败") } if !v.extSvc.InvoiceService { return exceptions.NewFailFastErr("发票服务不可用，立即失败") } return nil } /* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:28 # User : geovindu # Product : GoLand # Project : godesginpattern # File : order_service.go */ package service import ( "godesginpattern/failfast/repository" //"godesginpattern/failfast/exceptions" "strconv" "time" ) type OrderService struct { valSvc *ValidationService invRepo *repository.InventoryRepository extSvc *repository.ExternalServices } func NewOrderService(val *ValidationService, inv *repository.InventoryRepository, ext *repository.ExternalServices) *OrderService { return &OrderService{ valSvc: val, invRepo: inv, extSvc: ext, } } func (o *OrderService) CreateOrder(customerId, productId string, quantity int) (map[string]interface{}, error) { err := o.valSvc.FailFastCheck(customerId, productId, quantity) if err != nil { return nil, err } // 校验通过执行业务 o.invRepo.DeductStock(productId, quantity) orderId := "ORD" + strconv.FormatInt(time.Now().Unix(), 10) res := map[string]interface{}{ "order_id": orderId, "product_id": productId, "quantity": quantity, "remaining_stock": o.invRepo.GetStock(productId), "status": "success", } return res, nil } /* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Fail-Fast Pattern 快速失败模式 # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:31 # User : geovindu # Product : GoLand # Project : godesginpattern # File : order_controller.go */ package api import ( "fmt" "godesginpattern/failfast/exceptions" "godesginpattern/failfast/service" ) type OrderController struct { orderSvc *service.OrderService } func NewOrderController(svc *service.OrderService) *OrderController { return &OrderController{ orderSvc: svc, } } func (c *OrderController) CreateJewelryOrder(customerId, productId string, quantity int) string { res, err := c.orderSvc.CreateOrder(customerId, productId, quantity) if err != nil { if e, ok := err.(*exceptions.ResourceCheckFailedError); ok { return "\n❌ 快速失败: " + e.Msg } return "\n❌ 业务异常: " + err.Error() } return "\n✅ 订单创建成功！详情:" + fmt.Sprintf("%v", res) }

调用：

/* # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：failfast # Author : geovindu,Geovin Du 涂聚文. # IDE : goLang 2024.3.6 go 26.2 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/6/30 21:32 # User : geovindu # Product : GoLand # Project : godesginpattern # File : failfastbll.go */ package bll import ( "fmt" "godesginpattern/failfast/api" "godesginpattern/failfast/repository" "godesginpattern/failfast/service" ) func FailfastMain() { // 初始化依赖（和Python代码一一对应） inventoryRepo := repository.NewInventoryRepository() extServices := repository.NewExternalServices() validationService := service.NewValidationService(inventoryRepo, extServices) orderService := service.NewOrderService(validationService, inventoryRepo, extServices) controller := api.NewOrderController(orderService) // ====================== // 测试场景 完全对齐Python输出 // ====================== fmt.Println("==== 场景1：正常下单 ===") fmt.Println(controller.CreateJewelryOrder("C1001", "DIA001", 1)) fmt.Println("\n==== 场景2：库存不足 ===") fmt.Println(controller.CreateJewelryOrder("C1001", "DIA002", 1)) fmt.Println("\n==== 场景3：顾客无效 ===") fmt.Println(controller.CreateJewelryOrder("C", "DIA001", 1)) fmt.Println("\n==== 场景4：支付服务挂了 ===") extServices.PaymentGateway = false fmt.Println(controller.CreateJewelryOrder("C1001", "DIA001", 1)) }

输出：

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