mirror of
https://github.com/letic/terraform-provider-google.git
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e5e1c1e97f
Update all the packages under google.golang.org/api to use the same commit. This is a necessary precursor for using Go modules. There is a breaking API change in the clients, but it's a one line change. As such, Travis will say this doesn't build. I've verified after the one line change, it will run the unit tests. That change needs to be made in MM, however. Once this PR is merged, a PR against MM will be opened.
86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
// Copyright 2017 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gensupport
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import (
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"io"
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"net"
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"net/http"
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"time"
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"golang.org/x/net/context"
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)
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// Retry invokes the given function, retrying it multiple times if the connection failed or
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// the HTTP status response indicates the request should be attempted again. ctx may be nil.
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func Retry(ctx context.Context, f func() (*http.Response, error), backoff BackoffStrategy) (*http.Response, error) {
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for {
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resp, err := f()
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var status int
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if resp != nil {
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status = resp.StatusCode
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}
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// Return if we shouldn't retry.
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pause, retry := backoff.Pause()
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if !shouldRetry(status, err) || !retry {
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return resp, err
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}
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// Ensure the response body is closed, if any.
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if resp != nil && resp.Body != nil {
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resp.Body.Close()
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}
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// Pause, but still listen to ctx.Done if context is not nil.
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var done <-chan struct{}
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if ctx != nil {
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done = ctx.Done()
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}
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select {
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case <-done:
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return nil, ctx.Err()
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case <-time.After(pause):
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}
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}
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}
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// DefaultBackoffStrategy returns a default strategy to use for retrying failed upload requests.
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func DefaultBackoffStrategy() BackoffStrategy {
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return &ExponentialBackoff{
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Base: 250 * time.Millisecond,
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Max: 16 * time.Second,
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}
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}
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// shouldRetry returns true if the HTTP response / error indicates that the
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// request should be attempted again.
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func shouldRetry(status int, err error) bool {
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if 500 <= status && status <= 599 {
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return true
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}
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if status == statusTooManyRequests {
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return true
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}
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if err == io.ErrUnexpectedEOF {
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return true
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}
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if err, ok := err.(net.Error); ok {
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return err.Temporary()
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}
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return false
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}
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