[08]Go设计模式:代理模式(ProxyPattern)
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proxy
一、简介
代理设计模式是一种结构设计模式。这种模式建议为控制和访问主要对象提供额外的间接层。
在这种模式下,将创建一个新的代理类,该类实现与主对象相同的接口。这使您可以在主对象的实际逻辑之前或者之后执行某些行为。
二、代码
package main
import "fmt"
type server interface {
handleRequest(string, string) (int, string)
}
type nginx struct {
application *application
maxAllowedRequest int
rateLimiter map[string]int
}
func newNginxServer() *nginx {
return &nginx{
application: &application{},
maxAllowedRequest: 2,
rateLimiter: make(map[string]int),
}
}
func (n *nginx) handleRequest(url, method string) (int, string) {
allowed := n.checkRateLimiting(url)
if !allowed {
return 403, "Not Allowed"
}
return n.application.handleRequest(url, method)
}
func (n *nginx) checkRateLimiting(url string) bool {
if n.rateLimiter[url] == 0 {
n.rateLimiter[url] = 1
}
if n.rateLimiter[url] > n.maxAllowedRequest {
return false
}
n.rateLimiter[url] = n.rateLimiter[url] + 1
return true
}
type application struct {
}
func (a *application) handleRequest(url, method string) (int, string) {
if url == "/app/status" && method == "GET" {
return 200, "Ok"
}
if url == "/create/user" && method == "POST" {
return 201, "User Created"
}
return 404, "Not Ok"
}
func main() {
nginxServer := newNginxServer()
appStatusURL := "/app/status"
createuserURL := "/create/user"
httpCode, body := nginxServer.handleRequest(appStatusURL, "GET")
fmt.Printf("
Url: %s
HttpCode: %d
Body: %s
", appStatusURL, httpCode, body)
httpCode, body = nginxServer.handleRequest(appStatusURL, "GET")
fmt.Printf("
Url: %s
HttpCode: %d
Body: %s
", appStatusURL, httpCode, body)
httpCode, body = nginxServer.handleRequest(appStatusURL, "GET")
fmt.Printf("
Url: %s
HttpCode: %d
Body: %s
", appStatusURL, httpCode, body)
httpCode, body = nginxServer.handleRequest(createuserURL, "POST")
fmt.Printf("
Url: %s
HttpCode: %d
Body: %s
", appStatusURL, httpCode, body)
httpCode, body = nginxServer.handleRequest(createuserURL, "GET")
fmt.Printf("
Url: %s
HttpCode: %d
Body: %s
", appStatusURL, httpCode, body)
}
三、参考资料
1、https://golangbyexample.com/proxy-design-pattern-in-golang/
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