// UpdateRSWithRetries updates a RS with given applyUpdate function. Note that RS not found error is ignored.
// The returned bool value can be used to tell if the RS is actually updated.
func UpdateRSWithRetries(rsClient unversionedextensions.ReplicaSetInterface, rs *extensions.ReplicaSet, applyUpdate updateRSFunc) (*extensions.ReplicaSet, bool, error) {
var err error
var rsUpdated bool
oldRs := rs
if err = wait.Poll(10*time.Millisecond, 1*time.Minute, func() (bool, error) {
rs, err = rsClient.Get(oldRs.Name)
if err != nil {
return false, err
}
// Apply the update, then attempt to push it to the apiserver.
if err = applyUpdate(rs); err != nil {
return false, err
}
if rs, err = rsClient.Update(rs); err == nil {
// Update successful.
return true, nil
}
// TODO: don't retry on perm-failed errors and handle them gracefully
// Update could have failed due to conflict error. Try again.
return false, nil
}); err == nil {
// When there's no error, we've updated this RS.
rsUpdated = true
}
// Handle returned error from wait poll
if err == wait.ErrWaitTimeout {
err = fmt.Errorf("timed out trying to update RS: %+v", oldRs)
}
// Ignore the RS not found error, but the RS isn't updated.
if errors.IsNotFound(err) {
glog.V(4).Infof("%s %s/%s is not found, skip updating it.", oldRs.Kind, oldRs.Namespace, oldRs.Name)
err = nil
}
// Ignore the precondition violated error, but the RS isn't updated.
if err == errorsutil.ErrPreconditionViolated {
glog.V(4).Infof("%s %s/%s precondition doesn't hold, skip updating it.", oldRs.Kind, oldRs.Namespace, oldRs.Name)
err = nil
}
// If the error is non-nil the returned RS cannot be trusted; if rsUpdated is false, the contoller isn't updated;
// if the error is nil and rsUpdated is true, the returned RS contains the applied update.
return rs, rsUpdated, err
}
func updateRSWithRetries(rsClient unversionedextensions.ReplicaSetInterface, rs *extensions.ReplicaSet, applyUpdate updateRSFunc) (*extensions.ReplicaSet, error) {
var err error
oldRs := rs
err = wait.Poll(10*time.Millisecond, 1*time.Minute, func() (bool, error) {
rs, err = rsClient.Get(oldRs.Name)
if err != nil {
return false, err
}
// Apply the update, then attempt to push it to the apiserver.
applyUpdate(rs)
if rs, err = rsClient.Update(rs); err == nil {
// Update successful.
return true, nil
}
// Update could have failed due to conflict error. Try again.
return false, nil
})
// If the error is non-nil the returned controller cannot be trusted, if it is nil, the returned
// controller contains the applied update.
return rs, err
}
func updateRSWithRetries(rsClient unversionedextensions.ReplicaSetInterface, rs *extensions.ReplicaSet, applyUpdate updateRSFunc) (*extensions.ReplicaSet, error) {
var err error
oldRs := rs
err = wait.Poll(10*time.Millisecond, 1*time.Minute, func() (bool, error) {
// Apply the update, then attempt to push it to the apiserver.
applyUpdate(rs)
if rs, err = rsClient.Update(rs); err == nil {
// rs contains the latest controller post update
return true, nil
}
// Update the controller with the latest resource version, if the update failed we
// can't trust rs so use oldRs.Name.
if rs, err = rsClient.Get(oldRs.Name); err != nil {
// The Get failed: Value in rs cannot be trusted.
rs = oldRs
}
// The Get passed: rs contains the latest controller, expect a poll for the update.
return false, nil
})
// If the error is non-nil the returned controller cannot be trusted, if it is nil, the returned
// controller contains the applied update.
return rs, err
}