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meta_manager.go
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/
meta_manager.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 meta
import (
"errors"
"github.com/pingcap/tidb-operator/pkg/apis/pingcap.com/v1alpha1"
"github.com/pingcap/tidb-operator/pkg/controller"
"github.com/pingcap/tidb-operator/pkg/label"
"github.com/pingcap/tidb-operator/pkg/manager"
corev1 "k8s.io/api/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
)
var errPVCNotFound = errors.New("PVC is not found")
type metaManager struct {
pvcLister corelisters.PersistentVolumeClaimLister
pvcControl controller.PVCControlInterface
pvLister corelisters.PersistentVolumeLister
pvControl controller.PVControlInterface
podLister corelisters.PodLister
podControl controller.PodControlInterface
}
// NewMetaManager returns a *metaManager
func NewMetaManager(
pvcLister corelisters.PersistentVolumeClaimLister,
pvcControl controller.PVCControlInterface,
pvLister corelisters.PersistentVolumeLister,
pvControl controller.PVControlInterface,
podLister corelisters.PodLister,
podControl controller.PodControlInterface,
) manager.Manager {
return &metaManager{
pvcLister: pvcLister,
pvcControl: pvcControl,
pvLister: pvLister,
pvControl: pvControl,
podLister: podLister,
podControl: podControl,
}
}
func (pmm *metaManager) Sync(tc *v1alpha1.TidbCluster) error {
ns := tc.GetNamespace()
instanceName := tc.GetLabels()[label.InstanceLabelKey]
l, err := label.New().Instance(instanceName).Selector()
if err != nil {
return err
}
pods, err := pmm.podLister.Pods(ns).List(l)
if err != nil {
return err
}
for _, pod := range pods {
// update meta info for pod
_, err := pmm.podControl.UpdateMetaInfo(tc, pod)
if err != nil {
return err
}
if component := pod.Labels[label.ComponentLabelKey]; component != label.PDLabelVal && component != label.TiKVLabelVal {
// Skip syncing meta info for pod that doesn't use PV
// Currently only PD/TiKV uses PV
continue
}
// update meta info for pvc
pvc, err := pmm.resolvePVCFromPod(pod)
if err != nil {
return err
}
_, err = pmm.pvcControl.UpdateMetaInfo(tc, pvc, pod)
if err != nil {
return err
}
// update meta info for pv
pv, err := pmm.pvLister.Get(pvc.Spec.VolumeName)
if err != nil {
return err
}
_, err = pmm.pvControl.UpdateMetaInfo(tc, pv)
if err != nil {
return err
}
}
return nil
}
func (pmm *metaManager) resolvePVCFromPod(pod *corev1.Pod) (*corev1.PersistentVolumeClaim, error) {
var pvcName string
for _, vol := range pod.Spec.Volumes {
switch vol.Name {
case v1alpha1.PDMemberType.String(), v1alpha1.TiKVMemberType.String():
if vol.PersistentVolumeClaim != nil {
pvcName = vol.PersistentVolumeClaim.ClaimName
break
}
default:
continue
}
}
if len(pvcName) == 0 {
return nil, errPVCNotFound
}
pvc, err := pmm.pvcLister.PersistentVolumeClaims(pod.Namespace).Get(pvcName)
if err != nil {
return nil, err
}
return pvc, nil
}
var _ manager.Manager = &metaManager{}
type FakeMetaManager struct {
err error
}
func NewFakeMetaManager() *FakeMetaManager {
return &FakeMetaManager{}
}
func (fmm *FakeMetaManager) SetSyncError(err error) {
fmm.err = err
}
func (fmm *FakeMetaManager) Sync(_ *v1alpha1.TidbCluster) error {
if fmm.err != nil {
return fmm.err
}
return nil
}