/
pv_cleanup.go
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/
pv_cleanup.go
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//
// DISCLAIMER
//
// Copyright 2016-2024 ArangoDB GmbH, Cologne, Germany
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package storage
import (
"context"
"sync"
"time"
"github.com/rs/zerolog"
core "k8s.io/api/core/v1"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/arangodb/kube-arangodb/pkg/logging"
"github.com/arangodb/kube-arangodb/pkg/storage/provisioner"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
"github.com/arangodb/kube-arangodb/pkg/util/k8sutil/kerrors"
"github.com/arangodb/kube-arangodb/pkg/util/timer"
"github.com/arangodb/kube-arangodb/pkg/util/trigger"
)
var pcLogger = logging.Global().RegisterAndGetLogger("deployment-storage-pc", logging.Info)
type pvCleaner struct {
mutex sync.Mutex
log logging.Logger
cli kubernetes.Interface
items []*core.PersistentVolume
trigger trigger.Trigger
clientGetter func(ctx context.Context, nodeName string) (provisioner.API, error)
}
// newPVCleaner creates a new cleaner of persistent volumes.
func newPVCleaner(cli kubernetes.Interface, clientGetter func(ctx context.Context, nodeName string) (provisioner.API, error)) *pvCleaner {
c := &pvCleaner{
cli: cli,
clientGetter: clientGetter,
}
c.log = pcLogger.WrapObj(c)
return c
}
// Run continues cleaning PV's until the given channel is closed.
func (c *pvCleaner) Run(stopCh <-chan struct{}) {
for {
delay := time.Hour
hasMore, err := c.cleanFirst()
if err != nil {
c.log.Err(err).Error("Failed to clean PersistentVolume")
}
if hasMore {
delay = time.Millisecond * 5
}
select {
case <-stopCh:
// We're done
return
case <-c.trigger.Done():
// Continue
case <-timer.After(delay):
// Continue
}
}
}
// Add the given volume to the list of items to clean.
func (c *pvCleaner) Add(pv *core.PersistentVolume) {
c.mutex.Lock()
defer c.mutex.Unlock()
// Check the existing list first, ignore if already found
for _, x := range c.items {
if x.GetUID() == pv.GetUID() {
return
}
}
// Is new, add it
c.items = append(c.items, pv.DeepCopy())
c.trigger.Trigger()
}
// cleanFirst tries to clean the first PV in the list.
// Returns (hasMore, error)
func (c *pvCleaner) cleanFirst() (bool, error) {
var first *core.PersistentVolume
c.mutex.Lock()
if len(c.items) > 0 {
first = c.items[0]
}
c.mutex.Unlock()
if first == nil {
// Nothing todo
return false, nil
}
// Do actual cleaning
if err := c.clean(*first); err != nil {
return true, errors.WithStack(err)
}
// Remove first from list
c.mutex.Lock()
c.items = c.items[1:]
remaining := len(c.items)
c.mutex.Unlock()
return remaining > 0, nil
}
// clean tries to clean the given PV.
func (c *pvCleaner) clean(pv core.PersistentVolume) error {
log := c.log.Str("name", pv.GetName())
log.Debug("Cleaning PersistentVolume")
// Find local path
localSource := pv.Spec.PersistentVolumeSource.Local
if localSource == nil {
return errors.WithStack(errors.Errorf("PersistentVolume has no local source"))
}
localPath := localSource.Path
// Find client that serves the node
nodeName := pv.GetAnnotations()[nodeNameAnnotation]
if nodeName == "" {
return errors.WithStack(errors.Errorf("PersistentVolume has no node-name annotation"))
}
client, err := c.clientGetter(context.Background(), nodeName)
if err != nil {
log.Err(err).Str("node", nodeName).Debug("Failed to get client for node")
return errors.WithStack(err)
}
// Clean volume through client
ctx := context.Background()
if err := client.Remove(ctx, localPath); err != nil {
log.Err(err).
Str("node", nodeName).
Str("local-path", localPath).
Debug("Failed to remove local path")
return errors.WithStack(err)
}
// Remove persistent volume
if err := c.cli.CoreV1().PersistentVolumes().Delete(context.Background(), pv.GetName(), meta.DeleteOptions{}); err != nil && !kerrors.IsNotFound(err) {
log.Err(err).
Str("name", pv.GetName()).
Debug("Failed to remove PersistentVolume")
return errors.WithStack(err)
}
return nil
}
func (c *pvCleaner) WrapLogger(in *zerolog.Event) *zerolog.Event {
return in
}