mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
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7b248ecae2
When a message received via the channel, the main loop updates the `NodeResourceTopology` objects. The notifier will send a message via the channel if: 1. It reached the sleep timeout. 2. It detected a change in Kubelet state files Signed-off-by: Talor Itzhak <titzhak@redhat.com>
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package kubeletnotifier
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import (
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"fmt"
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"time"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/klog/v2"
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"github.com/fsnotify/fsnotify"
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)
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type EventType string
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const (
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IntervalBased EventType = "intervalBased"
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FSUpdate EventType = "fsUpdate"
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)
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var stateFiles = sets.NewString(
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"cpu_manager_state",
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"memory_manager_state",
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"kubelet_internal_checkpoint",
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)
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type Notifier struct {
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sleepInterval time.Duration
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// destination where notifications are sent
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dest chan<- Info
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fsEvent <-chan fsnotify.Event
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}
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type Info struct {
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Event EventType
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}
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func New(sleepInterval time.Duration, dest chan<- Info, kubeletStateDir string) (*Notifier, error) {
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ch, err := createFSWatcherEvent([]string{kubeletStateDir})
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if err != nil {
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return nil, err
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}
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return &Notifier{
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sleepInterval: sleepInterval,
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dest: dest,
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fsEvent: ch,
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}, nil
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}
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func (n *Notifier) Run() {
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t := time.Tick(n.sleepInterval)
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for {
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select {
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case <-t:
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klog.V(5).Infof("timer update received")
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i := Info{Event: IntervalBased}
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n.dest <- i
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case e := <-n.fsEvent:
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klog.V(5).Infof("fsnotify event from file %q: %q received", e.Name, e.Op)
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if stateFiles.Has(e.Name) {
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i := Info{Event: FSUpdate}
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n.dest <- i
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}
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}
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}
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}
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func createFSWatcherEvent(fsWatchPaths []string) (chan fsnotify.Event, error) {
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fsWatcher, err := fsnotify.NewWatcher()
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if err != nil {
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return nil, err
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}
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for _, path := range fsWatchPaths {
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if err = fsWatcher.Add(path); err != nil {
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return nil, fmt.Errorf("failed to watch: %q; %w", path, err)
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}
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}
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return fsWatcher.Events, nil
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}
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