英文:
golang dont understand how http.Server Handler calling functions which attahced to empty struct
问题
这段代码是一个简单的Web服务器。让我来解释一下。
首先，代码中的Handler: app.routes()是在创建http.Server时设置的处理程序。app.routes()是一个方法，它返回一个http.Handler，用于处理传入的HTTP请求。
在routes文件中，func (app *Config) routes() http.Handler是一个方法的定义。它的接收者是app *Config，表示该方法是与Config类型相关联的。这意味着只有Config类型的实例才能调用这个方法。
在main函数中，app := Config{}创建了一个Config类型的实例app。然后，app.routes()被调用并作为处理程序传递给http.Server。
所以，app实例调用了routes方法，这就是为什么routes方法能够被触发的原因。
英文:
i have this code of simple web server but i dont understand this code :
Handler:app.routes(),
const webPort = "80"type Config struct {}func main() {app := Config{}log.Printf("Starting broker service on port %s\n",webPort)srv := &http.Server{Addr: fmt.Sprintf(":%s",webPort),Handler:app.routes(),}err := srv.ListenAndServe()if(err != nil) {log.Panic(err)}}
and in routes file :
func (app *Config) routes() http.Handler {mux := chi.NewRouter()mux.Use(cors.Handler(cors.Options{AllowedOrigins: []string{"http://*","https://*"},AllowedMethods: []string{"GET", "POST", "DELETE","PUT","OPTIONS"},AllowedHeaders: []string{"Accept","Authorization","Content-Type","X-CSRF-Token"},ExposedHeaders: []string{"Link"},AllowCredentials:true,MaxAge:300,}))mux.Use(middleware.Heartbeat("/ping"))mux.Post("/",app.Broker)return mux}
this is wroking and the routes() function called when request recived
but how does this routes() knows to be triggered when it attached to empty struct
app := Config{}
from where does app knows about routes() ?
what is the :
func (app *Config)
in the function ?
答案1
得分: 3
路由已附加到HTTP服务器，如下所示。
srv := &http.Server{Addr: ":8081", // 端口Handler: app.routes() // 调用的处理程序}
routes 是 Config 结构体的一个方法。即使 Config 是空的，我们仍然可以像你的代码中一样调用 routes 方法。
cfg := Config{}r := cfg.routes()
在这里，Config 结构体充当方法接收器。
英文:
Routes have been attached to the HTTP server as shown below.
srv := &http.Server{Addr: ":8081", // portHandler: app.routes() // a handler to invoke}
routes is a method of Config struct. We can still call the routes methods as in your code even when Config is empty.
cfg := Config{}r := cfg.routes()
Config struct is acting as a method receiver here.
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