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watchdog.go
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watchdog.go
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/*
* This file is part of the kubevirt project
*
* 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 2017 Red Hat, Inc.
*
*/
package watchdog
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"sync"
"time"
k8sv1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/tools/cache"
"kubevirt.io/kubevirt/pkg/api/v1"
diskutils "kubevirt.io/kubevirt/pkg/ephemeral-disk-utils"
"kubevirt.io/kubevirt/pkg/log"
"kubevirt.io/kubevirt/pkg/precond"
"kubevirt.io/kubevirt/pkg/virt-handler/virtwrap/api"
)
func NewWatchdogListWatchFromClient(virtShareDir string, watchdogTimeout int) cache.ListerWatcher {
d := &WatchdogListWatcher{
fileDir: WatchdogFileDirectory(virtShareDir),
backgroundWatcherStarted: false,
watchdogTimeout: watchdogTimeout,
}
return d
}
func WatchdogFileDirectory(baseDir string) string {
return filepath.Join(baseDir, "watchdog-files")
}
func WatchdogFileFromNamespaceName(baseDir string, namespace string, name string) string {
watchdogFile := namespace + "_" + name
return filepath.Join(baseDir, "watchdog-files", watchdogFile)
}
func WatchdogFileRemove(baseDir string, vm *v1.VirtualMachine) error {
namespace := precond.MustNotBeEmpty(vm.GetObjectMeta().GetNamespace())
domain := precond.MustNotBeEmpty(vm.GetObjectMeta().GetName())
file := WatchdogFileFromNamespaceName(baseDir, namespace, domain)
return diskutils.RemoveFile(file)
}
func WatchdogFileUpdate(watchdogFile string) error {
f, err := os.Create(watchdogFile)
if err != nil {
return err
}
f.Close()
return nil
}
func WatchdogFileExists(baseDir string, vm *v1.VirtualMachine) (bool, error) {
namespace := precond.MustNotBeEmpty(vm.GetObjectMeta().GetNamespace())
domain := precond.MustNotBeEmpty(vm.GetObjectMeta().GetName())
filePath := WatchdogFileFromNamespaceName(baseDir, namespace, domain)
exists, err := diskutils.FileExists(filePath)
if err != nil {
log.Log.Reason(err).Errorf("Error encountered while attempting to verify if watchdog file at path %s exists.", filePath)
return false, err
}
return exists, nil
}
func WatchdogFileIsExpired(timeoutSeconds int, baseDir string, vm *v1.VirtualMachine) (bool, error) {
namespace := precond.MustNotBeEmpty(vm.GetObjectMeta().GetNamespace())
domain := precond.MustNotBeEmpty(vm.GetObjectMeta().GetName())
filePath := WatchdogFileFromNamespaceName(baseDir, namespace, domain)
exists, err := diskutils.FileExists(filePath)
if err != nil {
return false, err
}
if exists == false {
return true, nil
}
stat, err := os.Stat(filePath)
if err != nil {
return false, err
}
now := time.Now().UTC().Unix()
return isExpired(now, timeoutSeconds, stat), nil
}
func isExpired(now int64, timeoutSeconds int, stat os.FileInfo) bool {
mod := stat.ModTime().UTC().Unix()
diff := now - mod
if diff > int64(timeoutSeconds) {
return true
}
return false
}
func detectExpiredFiles(timeoutSeconds int, fileDir string) ([]string, error) {
var expiredFiles []string
files, err := ioutil.ReadDir(fileDir)
if err != nil {
return nil, err
}
now := time.Now().UTC().Unix()
for _, file := range files {
if isExpired(now, timeoutSeconds, file) == true {
expiredFiles = append(expiredFiles, file.Name())
}
}
return expiredFiles, nil
}
type WatchdogListWatcher struct {
lock sync.Mutex
wg sync.WaitGroup
fileDir string
stopChan chan struct{}
eventChan chan watch.Event
watchDogTicker <-chan time.Time
backgroundWatcherStarted bool
watchdogTimeout int
}
func splitFileNamespaceName(fullPath string) (namespace string, domain string, err error) {
fileName := filepath.Base(fullPath)
namespaceName := strings.Split(fileName, "_")
if len(namespaceName) != 2 {
return "", "", fmt.Errorf("Invalid file path: %s", fullPath)
}
namespace = namespaceName[0]
domain = namespaceName[1]
return namespace, domain, nil
}
func (d *WatchdogListWatcher) startBackground() error {
d.lock.Lock()
defer d.lock.Unlock()
if d.backgroundWatcherStarted == true {
return nil
}
d.stopChan = make(chan struct{}, 1)
d.eventChan = make(chan watch.Event, 100)
tickRate := 1
if d.watchdogTimeout > 1 {
tickRate = d.watchdogTimeout / 2
}
d.watchDogTicker = time.NewTicker(time.Duration(tickRate) * time.Second).C
d.wg.Add(1)
go func() {
defer d.wg.Done()
for {
select {
case <-d.stopChan:
return
case <-d.watchDogTicker:
expiredKeys, err := detectExpiredFiles(d.watchdogTimeout, d.fileDir)
if err != nil {
log.Log.Reason(err).Error("Invalid content detected during watchdog tick, ignoring and continuing.")
continue
}
for _, key := range expiredKeys {
namespace, name, err := splitFileNamespaceName(key)
if err != nil {
log.Log.Reason(err).Errorf("Invalid key (%s) detected during watchdog tick, ignoring and continuing.", key)
continue
}
d.eventChan <- watch.Event{Type: watch.Modified, Object: api.NewMinimalDomainWithNS(namespace, name)}
}
}
}
}()
d.backgroundWatcherStarted = true
return nil
}
func (d *WatchdogListWatcher) List(options k8sv1.ListOptions) (runtime.Object, error) {
err := d.startBackground()
if err != nil {
return nil, err
}
files, err := detectExpiredFiles(d.watchdogTimeout, d.fileDir)
domainList := &api.DomainList{
Items: []api.Domain{},
}
for _, file := range files {
namespace, name, err := splitFileNamespaceName(file)
if err != nil {
log.Log.Reason(err).Error("Invalid content detected, ignoring and continuing.")
continue
}
domainList.Items = append(domainList.Items, *api.NewMinimalDomainWithNS(namespace, name))
}
return domainList, nil
}
func (d *WatchdogListWatcher) Watch(options k8sv1.ListOptions) (watch.Interface, error) {
return d, nil
}
func (d *WatchdogListWatcher) Stop() {
d.lock.Lock()
defer d.lock.Unlock()
if d.backgroundWatcherStarted == false {
return
}
close(d.stopChan)
d.wg.Wait()
d.backgroundWatcherStarted = false
}
func (d *WatchdogListWatcher) ResultChan() <-chan watch.Event {
return d.eventChan
}