英文:
Go: accept different socket calls in one function
问题
我正在尝试让我的Web服务器在一个函数中接受不同的套接字调用。我的代码如下：
Go语言：
func handler(w io.Writer, r *io.ReadCloser) {
//做一些操作
}
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
handler(w, &r.Body)
})
http.ListenAndServe(":3000", nil)
}
我得到了以下错误：
无法将handler（类型为func（io.Writer，*io.ReadCloser））用作类型为func（http.ResponseWriter，*http.Request）的参数传递给http.HandleFunc
我该如何实现这个？
英文:
I'm trying to get my web server to accept different socket calls in one function. My code looks like this:
Go:
func handler(w io.Writer, r *io.ReadCloser) {
//do something
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":3000", nil)
}
I get the error:
cannot use handler (type func(io.Writer, *io.ReadCloser)) as type func(http.ResponseWriter, *http.Request) in argument to http.HandleFunc
How do I implement this?
答案1
得分: 1
如文章“编写Web应用程序”所示，HandleFunc的示例代码如下：
package main
import (
"fmt"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
你不能用r *io.ReadCloser替换r *http.Request。
你需要在一个包装器中委托该调用，如此线程中建议的：
func wrappingHandler(w http.ResponseWriter, r *http.Request){
handler(w, r.Body)
}
func main() {
http.HandleFunc("/", wrappingHandler)
http.ListenAndServe(":8080", nil)
}
或者简单地修改你的处理函数：
func handler(w http.ResponseWriter, r *http.Request) {
rb := r.Body
// 使用 rb 而不是 r 进行操作
}
英文:
As shown in the article "Writing Web Applications", the example for HandleFunc is:
package main
import (
"fmt"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}
You cannot replace a r *http.Request by an r *io.ReadCloser.
You would need to delegate that call in a wrapper, as suggested in this thread:
func wrappingHandler(w http.ResponseWriter, r *http.Request){
handler(w, r.Body)
}
func main() {
http.HandleFunc("/", wrappingHandler)
http.ListenAndServe(":8080", nil)
}
Or simply modify your handler:
func handler(w http.ResponseWriter, r *http.Request) {
rb := r.Body
//do something with rb instead of r
}
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