traefik/vendor/github.com/urfave/negroni/recovery.go

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2017-02-07 21:33:23 +00:00
package negroni
import (
"fmt"
"log"
"net/http"
"os"
"runtime"
"runtime/debug"
)
// Recovery is a Negroni middleware that recovers from any panics and writes a 500 if there was one.
type Recovery struct {
Logger ALogger
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PrintStack bool
ErrorHandlerFunc func(interface{})
StackAll bool
StackSize int
}
// NewRecovery returns a new instance of Recovery
func NewRecovery() *Recovery {
return &Recovery{
Logger: log.New(os.Stdout, "[negroni] ", 0),
PrintStack: true,
StackAll: false,
StackSize: 1024 * 8,
}
}
func (rec *Recovery) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
defer func() {
if err := recover(); err != nil {
if rw.Header().Get("Content-Type") == "" {
rw.Header().Set("Content-Type", "text/plain; charset=utf-8")
}
rw.WriteHeader(http.StatusInternalServerError)
stack := make([]byte, rec.StackSize)
stack = stack[:runtime.Stack(stack, rec.StackAll)]
f := "PANIC: %s\n%s"
rec.Logger.Printf(f, err, stack)
if rec.PrintStack {
fmt.Fprintf(rw, f, err, stack)
}
if rec.ErrorHandlerFunc != nil {
func() {
defer func() {
if err := recover(); err != nil {
rec.Logger.Printf("provided ErrorHandlerFunc panic'd: %s, trace:\n%s", err, debug.Stack())
rec.Logger.Printf("%s\n", debug.Stack())
}
}()
rec.ErrorHandlerFunc(err)
}()
}
}
}()
next(rw, r)
}