LogDog: Support per-namespace expired archival.

appengine/logdog/coordinator/backend/util.go

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package backend
-
-import (
-        "fmt"
-        "net/http"
-
-        log "github.com/luci/luci-go/common/logging"
-        "golang.org/x/net/context"
-)
-
-// httpError
-type httpError struct {
-        reason error
-        code   int
-}
-
-func (e *httpError) Error() string {
-        if r := e.reason; r != nil {
-                return fmt.Sprintf("%v: %q", e.reason, http.StatusText(e.code))
-        }
-        return http.StatusText(e.code)
-}
-
-func newHTTPError(reason error, code int) error {
-        return &httpError{reason, code}
-}
-
-// errorWrapper wraps an error-returning function and responds with an
-// InternalServerError if an error is returned.
-func errorWrapper(c context.Context, w http.ResponseWriter, f func() error) {
-        if err := f(); err != nil {
-                statusCode := http.StatusInternalServerError
-                if e, ok := err.(*httpError); ok {
-                        statusCode = e.code
-                }
-
-                log.Fields{
-                        log.ErrorKey: err,
-                        "statusCode": statusCode,
-                }.Errorf(c, "Backend handler returned error.")
-                w.WriteHeader(statusCode)
-        }
-}