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package helpers
import (
"fmt"
"net/http"
"time"
"github.com/sirupsen/logrus"
)
type retryHelper struct {
Retry int `long:"retry" description:"How many times to retry upload"`
RetryTime time.Duration `long:"retry-time" description:"How long to wait between retries"`
}
// retryableErr indicates that an error can be retried. To specify that an error
// can be retried simply wrap the original error. For example:
//
// retryableErr{err: errors.New("some error")}
type retryableErr struct {
err error
}
func (e retryableErr) Unwrap() error {
return e.err
}
func (e retryableErr) Error() string {
return e.err.Error()
}
func (r *retryHelper) doRetry(handler func(int) error) error {
err := handler(0)
for retry := 1; retry <= r.Retry; retry++ {
if _, ok := err.(retryableErr); !ok {
return err
}
time.Sleep(r.RetryTime)
logrus.WithError(err).Warningln("Retrying...")
err = handler(retry)
}
return err
}
// retryOnServerError will take the response and check if the the error should
// be of type retryableErr or not. When the status code is of 5xx it will be a
// retryableErr.
func retryOnServerError(resp *http.Response) error {
if resp.StatusCode/100 == 2 {
return nil
}
_ = resp.Body.Close()
err := fmt.Errorf("received: %s", resp.Status)
if resp.StatusCode/100 == 5 {
err = retryableErr{err: err}
}
return err
}
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