1// Copyright 2017 Google LLC
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//      http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15// +build !go1.10
16
17package storage
18
19import (
20	"net/url"
21	"strings"
22
23	"google.golang.org/api/googleapi"
24)
25
26func shouldRetry(err error) bool {
27	switch e := err.(type) {
28	case *googleapi.Error:
29		// Retry on 429 and 5xx, according to
30		// https://cloud.google.com/storage/docs/exponential-backoff.
31		return e.Code == 429 || (e.Code >= 500 && e.Code < 600)
32	case *url.Error:
33		// Retry on REFUSED_STREAM.
34		// Unfortunately the error type is unexported, so we resort to string
35		// matching.
36		return strings.Contains(e.Error(), "REFUSED_STREAM")
37	case interface{ Temporary() bool }:
38		return e.Temporary()
39	default:
40		return false
41	}
42}
43