go: Fail-Fast Pattern

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