如何用Golang实现责任链模式优化请求处理_Golang 责任链模式高效实践

type Handler interface {
    SetNext(handler Handler)
    Handle(request map[string]interface{}) bool
}

type BaseHandler struct {
    next Handler
}

func (b *BaseHandler) SetNext(handler Handler) {
    b.next = handler
}

func (b *BaseHandler) PassToNext(request map[string]interface{}) bool {
    if b.next == nil {
        return true // 链尾，无后续处理
    }
    return b.next.Handle(request)
}

type AuthHandler struct {
    BaseHandler
}

func (a *AuthHandler) Handle(request map[string]interface{}) bool {
    token, exists := request["token"]
    if !exists || token == "" {
        fmt.Println("认证失败：缺少 token")
        return false
    }
    fmt.Println("认证通过")
    return a.PassToNext(request)
}

type ValidateHandler struct {
    BaseHandler
}

func (v *ValidateHandler) Handle(request map[string]interface{}) bool {
    data, ok := request["data"].(map[string]string)
    if !ok || data["user_id"] == "" {
        fmt.Println("参数校验失败")
        return false
    }
    fmt.Println("参数校验通过")
    return v.PassToNext(request)
}

type LogHandler struct {
    BaseHandler
}

func (l *LogHandler) Handle(request map[string]interface{}) bool {
    fmt.Printf("日志记录：收到请求 %v\n", request)
    return l.PassToNext(request)
}

func main() {
    logHandler := &LogHandler{}
    authHandler := &AuthHandler{}
    validateHandler := &ValidateHandler{}

    // 组装链：日志 -> 认证 -> 校验
    logHandler.SetNext(authHandler)
    authHandler.SetNext(validateHandler)

    // 模拟请求
    request := map[string]interface{}{
        "token": "abc123",
        "data":  map[string]string{"user_id": "1001"},
    }

    // 开始处理
    logHandler.Handle(request)
}
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