We've seen failures in CI where DNS lookups fail which cause our operations against the service to fail, as well as other sorts of timeouts. Add a set of helper methods in a new httputil package that helps us do retries on these operations, and then update our client library to use them when we are doing GET requests. We also provide a way for non GET requests to be retried, and use this when updating a lease (since it is safe to retry multiple requests in this case).
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
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/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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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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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 false, res, resErr
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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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