如何包装自定义HandlerFunc

I have defined a CustomHandler (struct which implements ServerHTTP, and has a HandlerFunc that returns an error)

type CustomHandler struct{
  HandlerFunc func(w http.ResponseWriter, r *http.Request) error
}

type (c CustomHandler) ServerHTTP(w http.ResponseWriter, r *http.Request) {
  err := c.Handeler.ServerHttp(w, r)
  // Handler error
}

How can I wrap my CustomHandler?

I have tried this, but I keep getting not enough arguments.

func myMiddle(h CustomHandler) CustomHandler {
  return h.CusomHandlerFunc(func(w http.ResponseWriter, r *http.Request) error {
    h.ServerHTTP(w, r)
    return nil
  })
}

You can simply do that:

type handler func(w http.ResponseWriter, r *http.Request) error

func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    if err := h(w, r); err != nil {
        ...
    }
}

And use it like:

func home(w http.ResponseWriter, r *http.Request) error {
    ...
}

func main() {
    http.Handle("/", handler(home))
}

First define CustomHandler like this:

type CustomHandler struct{}

then ServeHTTP like this:

func (c CustomHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "%s", msg1)
}

See this working sample code:

package main

import "fmt"
import "net/http"

func main() {
    http.Handle("/", CustomHandler{})
    http.ListenAndServe(":80", nil)
}

type CustomHandler struct{}

func (c CustomHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "%s", msg1)
}

var msg1 string = `
<!DOCTYPE html>
<html>
<head> 
<title>Welcome Home</title>
</head>
<body>
Welcome Home
</body>
</html>
`

Then run the above code then open http://127.0.0.1/
output:

Welcome Home

Don't make so many spelling mistakes in your code.

ServerHTTP should be ServeHTTP
Handeler should be Handler
ServerHttp should be ServeHTTP
CusomHandlerFunc should be CustomHandlerFunc

When you have fixed these misspellings, you have a better chance that your code works.