53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package retryablehttp
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import (
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"errors"
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"net/http"
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"net/url"
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"sync"
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)
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// RoundTripper implements the http.RoundTripper interface, using a retrying
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// HTTP client to execute requests.
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//
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// It is important to note that retryablehttp doesn't always act exactly as a
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// RoundTripper should. This is highly dependent on the retryable client's
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// configuration.
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type RoundTripper struct {
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// The client to use during requests. If nil, the default retryablehttp
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// client and settings will be used.
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Client *Client
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// once ensures that the logic to initialize the default client runs at
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// most once, in a single thread.
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once sync.Once
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}
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// init initializes the underlying retryable client.
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func (rt *RoundTripper) init() {
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if rt.Client == nil {
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rt.Client = NewClient()
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}
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}
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// RoundTrip satisfies the http.RoundTripper interface.
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func (rt *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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rt.once.Do(rt.init)
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// Convert the request to be retryable.
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retryableReq, err := FromRequest(req)
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if err != nil {
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return nil, err
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}
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// Execute the request.
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resp, err := rt.Client.Do(retryableReq)
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// If we got an error returned by standard library's `Do` method, unwrap it
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// otherwise we will wind up erroneously re-nesting the error.
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if _, ok := err.(*url.Error); ok {
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return resp, errors.Unwrap(err)
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}
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return resp, err
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}
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