1// Copyright 2017 Google Inc. All Rights Reserved. 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 default: 38 return false 39 } 40} 41