78aaa29cee
If we've hit the maximum number of retry attempts, return `true` for `done`. As it stands, it is possible for us to return a `nil` error (e.g. if the request sends successfully but returns a `50x` status) and `false` for `done`, which `retry.Until` will interpret as "keep retrying".
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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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 httputil
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import (
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"context"
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"net/http"
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"time"
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"github.com/pulumi/pulumi/pkg/util/contract"
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"github.com/pulumi/pulumi/pkg/util/retry"
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)
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// maxRetryCount is the number of times to try an http request before giving up an returning the last error
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const maxRetryCount = 5
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// DoWithRetry calls client.Do, and in the case of an error, retries the operation again after a slight delay.
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func DoWithRetry(req *http.Request, client *http.Client) (*http.Response, error) {
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contract.Assertf(req.ContentLength == 0 || req.GetBody != nil,
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"Retryable request must have no body or rewindable body")
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inRange := func(test, lower, upper int) bool {
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return lower <= test && test <= upper
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}
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_, res, err := retry.Until(context.Background(), retry.Acceptor{
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Accept: func(try int, nextRetryTime time.Duration) (bool, interface{}, error) {
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if try > 0 && req.GetBody != nil {
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// Reset request body, if present, for retries.
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rc, bodyErr := req.GetBody()
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if bodyErr != nil {
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return false, nil, bodyErr
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}
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req.Body = rc
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}
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res, resErr := client.Do(req)
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if resErr == nil && !inRange(res.StatusCode, 500, 599) {
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return true, res, nil
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}
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if try >= (maxRetryCount - 1) {
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return true, res, resErr
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}
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// Close the response body, if present, since our caller can't.
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if resErr == nil {
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contract.IgnoreError(res.Body.Close())
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}
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return false, nil, nil
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},
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})
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if err != nil {
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return nil, err
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}
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return res.(*http.Response), nil
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}
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// GetWithRetry issues a GET request with the given client, and in the case of an error, retries the operation again
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// after a slight delay.
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func GetWithRetry(url string, client *http.Client) (*http.Response, error) {
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return nil, err
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}
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return DoWithRetry(req, client)
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}
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