mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-07-09 19:38:32 +00:00
961c878e0d
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
85 lines
2.1 KiB
Go
85 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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"context"
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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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)
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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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