mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-06 16:57:10 +00:00
000c919071
The nfd-topology-updater has state-directories notification mechanism enabled by default. In theory, we can have only timer-based updates, but if the option is given to disable the state-directories event source, then all the update mechanism is mistakenly disabled, including the timer-based updates. The two updaters mechanism should be decoupled. So this PR changes this to make sure we can enable just and only the timer-based updates. Signed-off-by: Francesco Romani <fromani@redhat.com>
115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
/*
|
|
Copyright 2023 The Kubernetes Authors.
|
|
|
|
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.
|
|
*/
|
|
|
|
package kubeletnotifier
|
|
|
|
import (
|
|
"fmt"
|
|
"path"
|
|
"time"
|
|
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
"k8s.io/klog/v2"
|
|
|
|
"github.com/fsnotify/fsnotify"
|
|
)
|
|
|
|
type EventType string
|
|
|
|
const (
|
|
IntervalBased EventType = "intervalBased"
|
|
FSUpdate EventType = "fsUpdate"
|
|
|
|
devicePluginsDirName = "device-plugins"
|
|
)
|
|
|
|
var stateFiles = sets.NewString(
|
|
"cpu_manager_state",
|
|
"memory_manager_state",
|
|
"kubelet_internal_checkpoint",
|
|
)
|
|
|
|
type Notifier struct {
|
|
sleepInterval time.Duration
|
|
// destination where notifications are sent
|
|
dest chan<- Info
|
|
fsEvent <-chan fsnotify.Event
|
|
}
|
|
|
|
type Info struct {
|
|
Event EventType
|
|
}
|
|
|
|
func New(sleepInterval time.Duration, dest chan<- Info, kubeletStateDir string) (*Notifier, error) {
|
|
notif := Notifier{
|
|
sleepInterval: sleepInterval,
|
|
dest: dest,
|
|
}
|
|
|
|
if kubeletStateDir != "" {
|
|
devicePluginsDir := path.Join(kubeletStateDir, devicePluginsDirName)
|
|
ch, err := createFSWatcherEvent([]string{kubeletStateDir, devicePluginsDir})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
notif.fsEvent = ch
|
|
}
|
|
|
|
return ¬if, nil
|
|
}
|
|
|
|
func (n *Notifier) Run() {
|
|
var timeEvents <-chan time.Time
|
|
|
|
if n.sleepInterval > 0 {
|
|
ticker := time.NewTicker(n.sleepInterval)
|
|
defer ticker.Stop()
|
|
timeEvents = ticker.C
|
|
}
|
|
|
|
// it's safe to keep the channels we don't need nil:
|
|
// https://dave.cheney.net/2014/03/19/channel-axioms
|
|
// "A receive from a nil channel blocks forever"
|
|
for {
|
|
select {
|
|
case <-timeEvents:
|
|
klog.V(5).InfoS("timer update received")
|
|
i := Info{Event: IntervalBased}
|
|
n.dest <- i
|
|
|
|
case e := <-n.fsEvent:
|
|
basename := path.Base(e.Name)
|
|
klog.V(5).InfoS("fsnotify event received", "filename", basename, "op", e.Op)
|
|
if stateFiles.Has(basename) {
|
|
i := Info{Event: FSUpdate}
|
|
n.dest <- i
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func createFSWatcherEvent(fsWatchPaths []string) (chan fsnotify.Event, error) {
|
|
fsWatcher, err := fsnotify.NewWatcher()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, path := range fsWatchPaths {
|
|
if err = fsWatcher.Add(path); err != nil {
|
|
return nil, fmt.Errorf("failed to watch: %q; %w", path, err)
|
|
}
|
|
}
|
|
return fsWatcher.Events, nil
|
|
}
|