func retryWithExponentialBackOff(initialDuration time.Duration, fn wait.ConditionFunc) error {
backoff := wait.Backoff{
Duration: initialDuration,
Factor: 3,
Jitter: 0,
Steps: 4,
}
return wait.ExponentialBackoff(backoff, fn)
}
// RetryConflict executes the provided function repeatedly, retrying if the server returns a conflicting
// write. Callers should preserve previous executions if they wish to retry changes. It performs an
// exponential backoff.
//
// var pod *api.Pod
// err := RetryOnConflict(DefaultBackoff, func() (err error) {
// pod, err = c.Pods("mynamespace").UpdateStatus(podStatus)
// return
// })
// if err != nil {
// // may be conflict if max retries were hit
// return err
// }
// ...
//
// TODO: Make Backoff an interface?
func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
var lastConflictErr error
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
err := fn()
switch {
case err == nil:
return true, nil
case errors.IsConflict(err):
lastConflictErr = err
return false, nil
default:
return false, err
}
})
if err == wait.ErrWaitTimeout {
err = lastConflictErr
}
return err
}
// waitTest waits until all tests, controllers and other goroutines do their
// job and list of current volumes/claims is equal to list of expected
// volumes/claims (with ~10 second timeout).
func (r *volumeReactor) waitTest(test controllerTest) error {
// start with 10 ms, multiply by 2 each step, 10 steps = 10.23 seconds
backoff := wait.Backoff{
Duration: 10 * time.Millisecond,
Jitter: 0,
Factor: 2,
Steps: 10,
}
err := wait.ExponentialBackoff(backoff, func() (done bool, err error) {
// Finish all operations that are in progress
r.ctrl.runningOperations.WaitForCompletion()
// Return 'true' if the reactor reached the expected state
err1 := r.checkClaims(test.expectedClaims)
err2 := r.checkVolumes(test.expectedVolumes)
if err1 == nil && err2 == nil {
return true, nil
}
return false, nil
})
return err
}
// WithExponentialBackoff will retry webhookFn() up to 5 times with exponentially increasing backoff when
// it returns an error for which apierrors.SuggestsClientDelay() or apierrors.IsInternalError() returns true.
func WithExponentialBackoff(initialBackoff time.Duration, webhookFn func() error) error {
backoff := wait.Backoff{
Duration: initialBackoff,
Factor: 1.5,
Jitter: 0.2,
Steps: 5,
}
var err error
wait.ExponentialBackoff(backoff, func() (bool, error) {
err = webhookFn()
if _, shouldRetry := apierrors.SuggestsClientDelay(err); shouldRetry {
return false, nil
}
if apierrors.IsInternalError(err) {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
})
return err
}