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package middleware
import (
"bytes"
"log"
"net/http"
"runtime/debug"
"github.com/zenazn/goji/web"
)
// Recoverer is a middleware that recovers from panics, logs the panic (and a
// backtrace), and returns a HTTP 500 (Internal Server Error) status if
// possible.
//
// Recoverer prints a request ID if one is provided.
func Recoverer(c *web.C, h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
reqID := GetReqID(*c)
defer func() {
if err := recover(); err != nil {
printPanic(reqID, err)
debug.PrintStack()
http.Error(w, http.StatusText(500), 500)
}
}()
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func printPanic(reqID string, err interface{}) {
var buf bytes.Buffer
if reqID != "" {
cW(&buf, bBlack, "[%s] ", reqID)
}
cW(&buf, bRed, "panic: %+v", err)
log.Print(buf.String())
}
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