func (t *Tester) testUpdateFailsOnVersionTooOld(obj runtime.Object, setFn SetFunc, getFn GetFunc) {
ctx := t.TestContext()
foo := copyOrDie(obj)
t.setObjectMeta(foo, "foo3")
if err := setFn(ctx, foo); err != nil {
t.Errorf("unexpected error: %v", err)
}
storedFoo, err := getFn(ctx, foo)
if err != nil {
t.Errorf("unexpected error: %v", err)
}
older := copyOrDie(storedFoo)
olderMeta := t.getObjectMetaOrFail(older)
olderMeta.ResourceVersion = "1"
_, _, err = t.storage.(rest.Updater).Update(t.TestContext(), older)
if err == nil {
t.Errorf("Expected an error, but we didn't get one")
} else if !errors.IsConflict(err) {
t.Errorf("Expected Conflict error, got '%v'", err)
}
}
// 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
}
