package pkg

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

func Recoverer(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if r := recover(); r != nil {
				if r == http.ErrAbortHandler {
					panic(r);
				}
				err, ok := r.(error)
				if ! ok {
					err = fmt.Errorf("%v", r);
				}
				stack := make([]byte, 4 << 10);
				length := runtime.Stack(stack, true)
				log.Printf("PANIC - %v %s", err, stack[:length])
				http.Error(w, err.Error(), http.StatusInternalServerError)
			}
		}();
		next.ServeHTTP(w, r);
	});
}