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stateful_set_control.go
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/
stateful_set_control.go
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// Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package controller
import (
"fmt"
"strings"
"github.com/pingcap/tidb-operator/pkg/apis/pingcap.com/v1alpha1"
tcinformers "github.com/pingcap/tidb-operator/pkg/client/informers/externalversions/pingcap.com/v1alpha1"
v1listers "github.com/pingcap/tidb-operator/pkg/client/listers/pingcap.com/v1alpha1"
apps "k8s.io/api/apps/v1beta1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
appsinformers "k8s.io/client-go/informers/apps/v1beta1"
"k8s.io/client-go/kubernetes"
appslisters "k8s.io/client-go/listers/apps/v1beta1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
)
// StatefulSetControlInterface defines the interface that uses to create, update, and delete StatefulSets,
type StatefulSetControlInterface interface {
// CreateStatefulSet creates a StatefulSet in a TidbCluster.
CreateStatefulSet(*v1alpha1.TidbCluster, *apps.StatefulSet) error
// UpdateStatefulSet updates a StatefulSet in a TidbCluster.
UpdateStatefulSet(*v1alpha1.TidbCluster, *apps.StatefulSet) error
// DeleteStatefulSet deletes a StatefulSet in a TidbCluster.
DeleteStatefulSet(*v1alpha1.TidbCluster, *apps.StatefulSet) error
}
type realStatefulSetControl struct {
kubeCli kubernetes.Interface
setLister appslisters.StatefulSetLister
recorder record.EventRecorder
}
// NewRealStatefuSetControl returns a StatefulSetControlInterface
func NewRealStatefuSetControl(kubeCli kubernetes.Interface, setLister appslisters.StatefulSetLister, recorder record.EventRecorder) StatefulSetControlInterface {
return &realStatefulSetControl{kubeCli, setLister, recorder}
}
// CreateStatefulSet create a StatefulSet in a TidbCluster.
func (sc *realStatefulSetControl) CreateStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
_, err := sc.kubeCli.AppsV1beta1().StatefulSets(tc.Namespace).Create(set)
// sink already exists errors
if apierrors.IsAlreadyExists(err) {
return err
}
sc.recordStatefulSetEvent("create", tc, set, err)
return err
}
// UpdateStatefulSet update a StatefulSet in a TidbCluster.
func (sc *realStatefulSetControl) UpdateStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
err := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
// TODO: verify if StatefulSet identity(name, namespace, labels) matches TidbCluster
_, updateErr := sc.kubeCli.AppsV1beta1().StatefulSets(tc.Namespace).Update(set)
if updateErr == nil {
return nil
}
if updated, err := sc.setLister.StatefulSets(tc.Namespace).Get(set.Name); err != nil {
// make a copy so we don't mutate the shared cache
set = updated.DeepCopy()
} else {
utilruntime.HandleError(fmt.Errorf("error getting updated StatefulSet %s/%s from lister: %v", tc.Namespace, set.Name, err))
}
return updateErr
})
sc.recordStatefulSetEvent("update", tc, set, err)
return err
}
// DeleteStatefulSet delete a StatefulSet in a TidbCluster.
func (sc *realStatefulSetControl) DeleteStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
err := sc.kubeCli.AppsV1beta1().StatefulSets(tc.Namespace).Delete(set.Name, nil)
sc.recordStatefulSetEvent("delete", tc, set, err)
return err
}
func (sc *realStatefulSetControl) recordStatefulSetEvent(verb string, tc *v1alpha1.TidbCluster, set *apps.StatefulSet, err error) {
tcName := tc.Name
setName := set.Name
if err == nil {
reason := fmt.Sprintf("Successful%s", strings.Title(verb))
message := fmt.Sprintf("%s StatefulSet %s in TidbCluster %s successful",
strings.ToLower(verb), setName, tcName)
sc.recorder.Event(tc, corev1.EventTypeNormal, reason, message)
} else {
reason := fmt.Sprintf("Failed%s", strings.Title(verb))
message := fmt.Sprintf("%s StatefulSet %s in TidbCluster %s failed error: %s",
strings.ToLower(verb), setName, tcName, err)
sc.recorder.Event(tc, corev1.EventTypeWarning, reason, message)
}
}
var _ StatefulSetControlInterface = &realStatefulSetControl{}
// FakeStatefulSetControl is a fake StatefulSetControlInterface
type FakeStatefulSetControl struct {
SetLister appslisters.StatefulSetLister
SetIndexer cache.Indexer
TcLister v1listers.TidbClusterLister
TcIndexer cache.Indexer
createStatefulSetTracker requestTracker
updateStatefulSetTracker requestTracker
deleteStatefulSetTracker requestTracker
statusChange func(set *apps.StatefulSet)
}
// NewFakeStatefulSetControl returns a FakeStatefulSetControl
func NewFakeStatefulSetControl(setInformer appsinformers.StatefulSetInformer, tcInformer tcinformers.TidbClusterInformer) *FakeStatefulSetControl {
return &FakeStatefulSetControl{
setInformer.Lister(),
setInformer.Informer().GetIndexer(),
tcInformer.Lister(),
tcInformer.Informer().GetIndexer(),
requestTracker{0, nil, 0},
requestTracker{0, nil, 0},
requestTracker{0, nil, 0},
nil,
}
}
// SetCreateStatefulSetError sets the error attributes of createStatefulSetTracker
func (ssc *FakeStatefulSetControl) SetCreateStatefulSetError(err error, after int) {
ssc.createStatefulSetTracker.err = err
ssc.createStatefulSetTracker.after = after
}
// SetUpdateStatefulSetError sets the error attributes of updateStatefulSetTracker
func (ssc *FakeStatefulSetControl) SetUpdateStatefulSetError(err error, after int) {
ssc.updateStatefulSetTracker.err = err
ssc.updateStatefulSetTracker.after = after
}
// SetDeleteStatefulSetError sets the error attributes of deleteStatefulSetTracker
func (ssc *FakeStatefulSetControl) SetDeleteStatefulSetError(err error, after int) {
ssc.deleteStatefulSetTracker.err = err
ssc.deleteStatefulSetTracker.after = after
}
func (ssc *FakeStatefulSetControl) SetStatusChange(fn func(*apps.StatefulSet)) {
ssc.statusChange = fn
}
// CreateStatefulSet adds the statefulset to SetIndexer
func (ssc *FakeStatefulSetControl) CreateStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
defer func() {
ssc.createStatefulSetTracker.inc()
ssc.statusChange = nil
}()
if ssc.createStatefulSetTracker.errorReady() {
defer ssc.createStatefulSetTracker.reset()
return ssc.createStatefulSetTracker.err
}
if ssc.statusChange != nil {
ssc.statusChange(set)
}
return ssc.SetIndexer.Add(set)
}
// UpdateStatefulSet updates the statefulset of SetIndexer
func (ssc *FakeStatefulSetControl) UpdateStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
defer func() {
ssc.updateStatefulSetTracker.inc()
ssc.statusChange = nil
}()
if ssc.updateStatefulSetTracker.errorReady() {
defer ssc.updateStatefulSetTracker.reset()
return ssc.updateStatefulSetTracker.err
}
if ssc.statusChange != nil {
ssc.statusChange(set)
}
return ssc.SetIndexer.Update(set)
}
// DeleteStatefulSet deletes the statefulset of SetIndexer
func (ssc *FakeStatefulSetControl) DeleteStatefulSet(tc *v1alpha1.TidbCluster, set *apps.StatefulSet) error {
return nil
}
var _ StatefulSetControlInterface = &FakeStatefulSetControl{}