关于golang:七天实现web框架错误处理

package gee

import (
 "fmt"
 "log"
 "net/http"
 "runtime"
 "strings"
)

// print stack trace for debug
func trace(message string) string {
 var pcs [32]uintptr
 n := runtime.Callers(3, pcs[:]) // skip first 3 caller

 var str strings.Builder
 str.WriteString(message + "\nTraceback:")
 for _, pc := range pcs[:n] {
     fn := runtime.FuncForPC(pc)
     file, line := fn.FileLine(pc)
     str.WriteString(fmt.Sprintf("\n\t%s:%d", file, line))
 }
 return str.String()
}

func Recovery() HandlerFunc {
 return func(c *Context) {
     defer func() {
         if err := recover(); err != nil {
             message := fmt.Sprintf("%s", err)
             log.Printf("%s\n\n", trace(message))
             c.Fail(http.StatusInternalServerError, "Internal Server Error")
         }
     }()

     c.Next()
 }
}