mirror of
https://github.com/ceph/ceph-csi.git
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519 lines
20 KiB
Go
519 lines
20 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubectl
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import (
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"fmt"
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"strconv"
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"time"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/kubernetes/pkg/apis/apps"
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"k8s.io/kubernetes/pkg/apis/batch"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/apis/extensions"
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"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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appsclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/apps/internalversion"
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batchclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/batch/internalversion"
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coreclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/internalversion"
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extensionsclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/extensions/internalversion"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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)
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// Scaler provides an interface for resources that can be scaled.
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type Scaler interface {
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// Scale scales the named resource after checking preconditions. It optionally
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// retries in the event of resource version mismatch (if retry is not nil),
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// and optionally waits until the status of the resource matches newSize (if wait is not nil)
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Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, wait *RetryParams) error
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// ScaleSimple does a simple one-shot attempt at scaling - not useful on its own, but
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// a necessary building block for Scale
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ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (updatedResourceVersion string, err error)
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}
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func ScalerFor(kind schema.GroupKind, c internalclientset.Interface) (Scaler, error) {
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switch kind {
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case api.Kind("ReplicationController"):
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return &ReplicationControllerScaler{c.Core()}, nil
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case extensions.Kind("ReplicaSet"), apps.Kind("ReplicaSet"):
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return &ReplicaSetScaler{c.Extensions()}, nil
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case batch.Kind("Job"):
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return &JobScaler{c.Batch()}, nil // Either kind of job can be scaled with Batch interface.
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case apps.Kind("StatefulSet"):
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return &StatefulSetScaler{c.Apps()}, nil
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case extensions.Kind("Deployment"), apps.Kind("Deployment"):
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return &DeploymentScaler{c.Extensions()}, nil
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}
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return nil, fmt.Errorf("no scaler has been implemented for %q", kind)
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}
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// ScalePrecondition describes a condition that must be true for the scale to take place
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// If CurrentSize == -1, it is ignored.
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// If CurrentResourceVersion is the empty string, it is ignored.
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// Otherwise they must equal the values in the resource for it to be valid.
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type ScalePrecondition struct {
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Size int
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ResourceVersion string
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}
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// A PreconditionError is returned when a resource fails to match
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// the scale preconditions passed to kubectl.
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type PreconditionError struct {
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Precondition string
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ExpectedValue string
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ActualValue string
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}
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func (pe PreconditionError) Error() string {
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return fmt.Sprintf("Expected %s to be %s, was %s", pe.Precondition, pe.ExpectedValue, pe.ActualValue)
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}
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type ScaleErrorType int
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const (
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ScaleGetFailure ScaleErrorType = iota
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ScaleUpdateFailure
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ScaleUpdateConflictFailure
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)
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// A ScaleError is returned when a scale request passes
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// preconditions but fails to actually scale the controller.
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type ScaleError struct {
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FailureType ScaleErrorType
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ResourceVersion string
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ActualError error
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}
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func (c ScaleError) Error() string {
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msg := fmt.Sprintf("Scaling the resource failed with: %v", c.ActualError)
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if len(c.ResourceVersion) > 0 {
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msg += fmt.Sprintf("; Current resource version %s", c.ResourceVersion)
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}
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return msg
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}
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// RetryParams encapsulates the retry parameters used by kubectl's scaler.
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type RetryParams struct {
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Interval, Timeout time.Duration
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}
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func NewRetryParams(interval, timeout time.Duration) *RetryParams {
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return &RetryParams{interval, timeout}
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}
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// ScaleCondition is a closure around Scale that facilitates retries via util.wait
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func ScaleCondition(r Scaler, precondition *ScalePrecondition, namespace, name string, count uint, updatedResourceVersion *string) wait.ConditionFunc {
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return func() (bool, error) {
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rv, err := r.ScaleSimple(namespace, name, precondition, count)
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if updatedResourceVersion != nil {
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*updatedResourceVersion = rv
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}
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switch e, _ := err.(ScaleError); err.(type) {
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case nil:
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return true, nil
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case ScaleError:
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// Retry only on update conflicts.
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if e.FailureType == ScaleUpdateConflictFailure {
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return false, nil
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}
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}
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return false, err
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}
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}
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// ValidateStatefulSet ensures that the preconditions match. Returns nil if they are valid, an error otherwise.
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func (precondition *ScalePrecondition) ValidateStatefulSet(ps *apps.StatefulSet) error {
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if precondition.Size != -1 && int(ps.Spec.Replicas) != precondition.Size {
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return PreconditionError{"replicas", strconv.Itoa(precondition.Size), strconv.Itoa(int(ps.Spec.Replicas))}
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}
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if len(precondition.ResourceVersion) != 0 && ps.ResourceVersion != precondition.ResourceVersion {
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return PreconditionError{"resource version", precondition.ResourceVersion, ps.ResourceVersion}
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}
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return nil
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}
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// ValidateReplicationController ensures that the preconditions match. Returns nil if they are valid, an error otherwise
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func (precondition *ScalePrecondition) ValidateReplicationController(controller *api.ReplicationController) error {
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if precondition.Size != -1 && int(controller.Spec.Replicas) != precondition.Size {
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return PreconditionError{"replicas", strconv.Itoa(precondition.Size), strconv.Itoa(int(controller.Spec.Replicas))}
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}
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if len(precondition.ResourceVersion) != 0 && controller.ResourceVersion != precondition.ResourceVersion {
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return PreconditionError{"resource version", precondition.ResourceVersion, controller.ResourceVersion}
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}
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return nil
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}
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type ReplicationControllerScaler struct {
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c coreclient.ReplicationControllersGetter
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}
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// ScaleSimple does a simple one-shot attempt at scaling. It returns the
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// resourceVersion of the replication controller if the update is successful.
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func (scaler *ReplicationControllerScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (string, error) {
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controller, err := scaler.c.ReplicationControllers(namespace).Get(name, metav1.GetOptions{})
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if err != nil {
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return "", ScaleError{ScaleGetFailure, "", err}
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}
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if preconditions != nil {
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if err := preconditions.ValidateReplicationController(controller); err != nil {
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return "", err
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}
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}
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controller.Spec.Replicas = int32(newSize)
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updatedRC, err := scaler.c.ReplicationControllers(namespace).Update(controller)
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if err != nil {
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if errors.IsConflict(err) {
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return "", ScaleError{ScaleUpdateConflictFailure, controller.ResourceVersion, err}
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}
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return "", ScaleError{ScaleUpdateFailure, controller.ResourceVersion, err}
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}
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return updatedRC.ObjectMeta.ResourceVersion, nil
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}
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// Scale updates a ReplicationController to a new size, with optional precondition check (if preconditions is not nil),
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// optional retries (if retry is not nil), and then optionally waits for it's replica count to reach the new value
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// (if wait is not nil).
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func (scaler *ReplicationControllerScaler) Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams) error {
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if preconditions == nil {
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preconditions = &ScalePrecondition{-1, ""}
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}
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if retry == nil {
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// Make it try only once, immediately
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retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
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}
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var updatedResourceVersion string
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cond := ScaleCondition(scaler, preconditions, namespace, name, newSize, &updatedResourceVersion)
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if err := wait.PollImmediate(retry.Interval, retry.Timeout, cond); err != nil {
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return err
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}
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if waitForReplicas != nil {
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checkRC := func(rc *api.ReplicationController) bool {
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if uint(rc.Spec.Replicas) != newSize {
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// the size is changed by other party. Don't need to wait for the new change to complete.
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return true
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}
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return rc.Status.ObservedGeneration >= rc.Generation && rc.Status.Replicas == rc.Spec.Replicas
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}
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// If number of replicas doesn't change, then the update may not event
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// be sent to underlying databse (we don't send no-op changes).
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// In such case, <updatedResourceVersion> will have value of the most
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// recent update (which may be far in the past) so we may get "too old
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// RV" error from watch or potentially no ReplicationController events
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// will be deliver, since it may already be in the expected state.
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// To protect from these two, we first issue Get() to ensure that we
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// are not already in the expected state.
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currentRC, err := scaler.c.ReplicationControllers(namespace).Get(name, metav1.GetOptions{})
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if err != nil {
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return err
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}
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if !checkRC(currentRC) {
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watchOptions := metav1.ListOptions{
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FieldSelector: fields.OneTermEqualSelector("metadata.name", name).String(),
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ResourceVersion: updatedResourceVersion,
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}
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watcher, err := scaler.c.ReplicationControllers(namespace).Watch(watchOptions)
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if err != nil {
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return err
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}
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_, err = watch.Until(waitForReplicas.Timeout, watcher, func(event watch.Event) (bool, error) {
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if event.Type != watch.Added && event.Type != watch.Modified {
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return false, nil
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}
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return checkRC(event.Object.(*api.ReplicationController)), nil
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})
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if err == wait.ErrWaitTimeout {
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return fmt.Errorf("timed out waiting for %q to be synced", name)
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}
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return err
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}
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}
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return nil
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}
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// ValidateReplicaSet ensures that the preconditions match. Returns nil if they are valid, an error otherwise
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func (precondition *ScalePrecondition) ValidateReplicaSet(replicaSet *extensions.ReplicaSet) error {
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if precondition.Size != -1 && int(replicaSet.Spec.Replicas) != precondition.Size {
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return PreconditionError{"replicas", strconv.Itoa(precondition.Size), strconv.Itoa(int(replicaSet.Spec.Replicas))}
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}
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if len(precondition.ResourceVersion) != 0 && replicaSet.ResourceVersion != precondition.ResourceVersion {
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return PreconditionError{"resource version", precondition.ResourceVersion, replicaSet.ResourceVersion}
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}
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return nil
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}
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type ReplicaSetScaler struct {
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c extensionsclient.ReplicaSetsGetter
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}
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// ScaleSimple does a simple one-shot attempt at scaling. It returns the
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// resourceVersion of the replicaset if the update is successful.
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func (scaler *ReplicaSetScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (string, error) {
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rs, err := scaler.c.ReplicaSets(namespace).Get(name, metav1.GetOptions{})
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if err != nil {
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return "", ScaleError{ScaleGetFailure, "", err}
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}
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if preconditions != nil {
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if err := preconditions.ValidateReplicaSet(rs); err != nil {
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return "", err
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}
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}
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rs.Spec.Replicas = int32(newSize)
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updatedRS, err := scaler.c.ReplicaSets(namespace).Update(rs)
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if err != nil {
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if errors.IsConflict(err) {
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return "", ScaleError{ScaleUpdateConflictFailure, rs.ResourceVersion, err}
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}
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return "", ScaleError{ScaleUpdateFailure, rs.ResourceVersion, err}
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}
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return updatedRS.ObjectMeta.ResourceVersion, nil
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}
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// Scale updates a ReplicaSet to a new size, with optional precondition check (if preconditions is
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// not nil), optional retries (if retry is not nil), and then optionally waits for it's replica
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// count to reach the new value (if wait is not nil).
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func (scaler *ReplicaSetScaler) Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams) error {
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if preconditions == nil {
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preconditions = &ScalePrecondition{-1, ""}
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}
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if retry == nil {
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// Make it try only once, immediately
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retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
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}
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cond := ScaleCondition(scaler, preconditions, namespace, name, newSize, nil)
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if err := wait.Poll(retry.Interval, retry.Timeout, cond); err != nil {
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return err
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}
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if waitForReplicas != nil {
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rs, err := scaler.c.ReplicaSets(namespace).Get(name, metav1.GetOptions{})
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if err != nil {
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return err
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}
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if rs.Initializers != nil {
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return nil
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}
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err = wait.Poll(waitForReplicas.Interval, waitForReplicas.Timeout, client.ReplicaSetHasDesiredReplicas(scaler.c, rs))
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if err == wait.ErrWaitTimeout {
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return fmt.Errorf("timed out waiting for %q to be synced", name)
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}
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return err
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}
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return nil
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}
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// ValidateJob ensures that the preconditions match. Returns nil if they are valid, an error otherwise.
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func (precondition *ScalePrecondition) ValidateJob(job *batch.Job) error {
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if precondition.Size != -1 && job.Spec.Parallelism == nil {
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return PreconditionError{"parallelism", strconv.Itoa(precondition.Size), "nil"}
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}
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if precondition.Size != -1 && int(*job.Spec.Parallelism) != precondition.Size {
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return PreconditionError{"parallelism", strconv.Itoa(precondition.Size), strconv.Itoa(int(*job.Spec.Parallelism))}
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}
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if len(precondition.ResourceVersion) != 0 && job.ResourceVersion != precondition.ResourceVersion {
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return PreconditionError{"resource version", precondition.ResourceVersion, job.ResourceVersion}
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}
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return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
type StatefulSetScaler struct {
|
||
|
|
c appsclient.StatefulSetsGetter
|
||
|
|
}
|
||
|
|
|
||
|
|
// ScaleSimple does a simple one-shot attempt at scaling. It returns the
|
||
|
|
// resourceVersion of the statefulset if the update is successful.
|
||
|
|
func (scaler *StatefulSetScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (string, error) {
|
||
|
|
ss, err := scaler.c.StatefulSets(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return "", ScaleError{ScaleGetFailure, "", err}
|
||
|
|
}
|
||
|
|
if preconditions != nil {
|
||
|
|
if err := preconditions.ValidateStatefulSet(ss); err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ss.Spec.Replicas = int32(newSize)
|
||
|
|
updatedStatefulSet, err := scaler.c.StatefulSets(namespace).Update(ss)
|
||
|
|
if err != nil {
|
||
|
|
if errors.IsConflict(err) {
|
||
|
|
return "", ScaleError{ScaleUpdateConflictFailure, ss.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return "", ScaleError{ScaleUpdateFailure, ss.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return updatedStatefulSet.ResourceVersion, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (scaler *StatefulSetScaler) Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams) error {
|
||
|
|
if preconditions == nil {
|
||
|
|
preconditions = &ScalePrecondition{-1, ""}
|
||
|
|
}
|
||
|
|
if retry == nil {
|
||
|
|
// Make it try only once, immediately
|
||
|
|
retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
|
||
|
|
}
|
||
|
|
cond := ScaleCondition(scaler, preconditions, namespace, name, newSize, nil)
|
||
|
|
if err := wait.Poll(retry.Interval, retry.Timeout, cond); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if waitForReplicas != nil {
|
||
|
|
job, err := scaler.c.StatefulSets(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if job.Initializers != nil {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
err = wait.Poll(waitForReplicas.Interval, waitForReplicas.Timeout, client.StatefulSetHasDesiredReplicas(scaler.c, job))
|
||
|
|
if err == wait.ErrWaitTimeout {
|
||
|
|
return fmt.Errorf("timed out waiting for %q to be synced", name)
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
type JobScaler struct {
|
||
|
|
c batchclient.JobsGetter
|
||
|
|
}
|
||
|
|
|
||
|
|
// ScaleSimple is responsible for updating job's parallelism. It returns the
|
||
|
|
// resourceVersion of the job if the update is successful.
|
||
|
|
func (scaler *JobScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (string, error) {
|
||
|
|
job, err := scaler.c.Jobs(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return "", ScaleError{ScaleGetFailure, "", err}
|
||
|
|
}
|
||
|
|
if preconditions != nil {
|
||
|
|
if err := preconditions.ValidateJob(job); err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
parallelism := int32(newSize)
|
||
|
|
job.Spec.Parallelism = ¶llelism
|
||
|
|
updatedJob, err := scaler.c.Jobs(namespace).Update(job)
|
||
|
|
if err != nil {
|
||
|
|
if errors.IsConflict(err) {
|
||
|
|
return "", ScaleError{ScaleUpdateConflictFailure, job.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return "", ScaleError{ScaleUpdateFailure, job.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return updatedJob.ObjectMeta.ResourceVersion, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Scale updates a Job to a new size, with optional precondition check (if preconditions is not nil),
|
||
|
|
// optional retries (if retry is not nil), and then optionally waits for parallelism to reach desired
|
||
|
|
// number, which can be less than requested based on job's current progress.
|
||
|
|
func (scaler *JobScaler) Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams) error {
|
||
|
|
if preconditions == nil {
|
||
|
|
preconditions = &ScalePrecondition{-1, ""}
|
||
|
|
}
|
||
|
|
if retry == nil {
|
||
|
|
// Make it try only once, immediately
|
||
|
|
retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
|
||
|
|
}
|
||
|
|
cond := ScaleCondition(scaler, preconditions, namespace, name, newSize, nil)
|
||
|
|
if err := wait.Poll(retry.Interval, retry.Timeout, cond); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if waitForReplicas != nil {
|
||
|
|
job, err := scaler.c.Jobs(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
err = wait.Poll(waitForReplicas.Interval, waitForReplicas.Timeout, client.JobHasDesiredParallelism(scaler.c, job))
|
||
|
|
if err == wait.ErrWaitTimeout {
|
||
|
|
return fmt.Errorf("timed out waiting for %q to be synced", name)
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ValidateDeployment ensures that the preconditions match. Returns nil if they are valid, an error otherwise.
|
||
|
|
func (precondition *ScalePrecondition) ValidateDeployment(deployment *extensions.Deployment) error {
|
||
|
|
if precondition.Size != -1 && int(deployment.Spec.Replicas) != precondition.Size {
|
||
|
|
return PreconditionError{"replicas", strconv.Itoa(precondition.Size), strconv.Itoa(int(deployment.Spec.Replicas))}
|
||
|
|
}
|
||
|
|
if len(precondition.ResourceVersion) != 0 && deployment.ResourceVersion != precondition.ResourceVersion {
|
||
|
|
return PreconditionError{"resource version", precondition.ResourceVersion, deployment.ResourceVersion}
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
type DeploymentScaler struct {
|
||
|
|
c extensionsclient.DeploymentsGetter
|
||
|
|
}
|
||
|
|
|
||
|
|
// ScaleSimple is responsible for updating a deployment's desired replicas
|
||
|
|
// count. It returns the resourceVersion of the deployment if the update is
|
||
|
|
// successful.
|
||
|
|
func (scaler *DeploymentScaler) ScaleSimple(namespace, name string, preconditions *ScalePrecondition, newSize uint) (string, error) {
|
||
|
|
deployment, err := scaler.c.Deployments(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return "", ScaleError{ScaleGetFailure, "", err}
|
||
|
|
}
|
||
|
|
if preconditions != nil {
|
||
|
|
if err := preconditions.ValidateDeployment(deployment); err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO(madhusudancs): Fix this when Scale group issues are resolved (see issue #18528).
|
||
|
|
// For now I'm falling back to regular Deployment update operation.
|
||
|
|
deployment.Spec.Replicas = int32(newSize)
|
||
|
|
updatedDeployment, err := scaler.c.Deployments(namespace).Update(deployment)
|
||
|
|
if err != nil {
|
||
|
|
if errors.IsConflict(err) {
|
||
|
|
return "", ScaleError{ScaleUpdateConflictFailure, deployment.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return "", ScaleError{ScaleUpdateFailure, deployment.ResourceVersion, err}
|
||
|
|
}
|
||
|
|
return updatedDeployment.ObjectMeta.ResourceVersion, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Scale updates a deployment to a new size, with optional precondition check (if preconditions is not nil),
|
||
|
|
// optional retries (if retry is not nil), and then optionally waits for the status to reach desired count.
|
||
|
|
func (scaler *DeploymentScaler) Scale(namespace, name string, newSize uint, preconditions *ScalePrecondition, retry, waitForReplicas *RetryParams) error {
|
||
|
|
if preconditions == nil {
|
||
|
|
preconditions = &ScalePrecondition{-1, ""}
|
||
|
|
}
|
||
|
|
if retry == nil {
|
||
|
|
// Make it try only once, immediately
|
||
|
|
retry = &RetryParams{Interval: time.Millisecond, Timeout: time.Millisecond}
|
||
|
|
}
|
||
|
|
cond := ScaleCondition(scaler, preconditions, namespace, name, newSize, nil)
|
||
|
|
if err := wait.Poll(retry.Interval, retry.Timeout, cond); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if waitForReplicas != nil {
|
||
|
|
deployment, err := scaler.c.Deployments(namespace).Get(name, metav1.GetOptions{})
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
err = wait.Poll(waitForReplicas.Interval, waitForReplicas.Timeout, client.DeploymentHasDesiredReplicas(scaler.c, deployment))
|
||
|
|
if err == wait.ErrWaitTimeout {
|
||
|
|
return fmt.Errorf("timed out waiting for %q to be synced", name)
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|