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 mainimport ("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 mainimport ("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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