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// SPDX-License-Identifier: GPL-3.0-or-later
package k8s_state
import (
"context"
"os"
"sync"
"time"
"github.com/netdata/netdata/go/go.d.plugin/logger"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
func newKubeDiscovery(client kubernetes.Interface, l *logger.Logger) *kubeDiscovery {
return &kubeDiscovery{
client: client,
Logger: l,
readyCh: make(chan struct{}),
stopCh: make(chan struct{}),
}
}
type kubeDiscovery struct {
*logger.Logger
client kubernetes.Interface
discoverers []discoverer
readyCh chan struct{}
stopCh chan struct{}
}
func (d *kubeDiscovery) run(ctx context.Context, in chan<- resource) {
d.Info("kube_discoverer is started")
defer func() { close(d.stopCh); d.Info("kube_discoverer is stopped") }()
d.discoverers = d.setupDiscoverers(ctx)
var wg sync.WaitGroup
updates := make(chan resource)
for _, dd := range d.discoverers {
wg.Add(1)
go func(dd discoverer) { defer wg.Done(); dd.run(ctx, updates) }(dd)
}
wg.Add(1)
go func() { defer wg.Done(); d.runDiscover(ctx, updates, in) }()
close(d.readyCh)
wg.Wait()
<-ctx.Done()
}
func (d *kubeDiscovery) ready() bool {
if !isChanClosed(d.readyCh) {
return false
}
for _, dd := range d.discoverers {
if !dd.ready() {
return false
}
}
return true
}
func (d *kubeDiscovery) stopped() bool {
if !isChanClosed(d.stopCh) {
return false
}
for _, dd := range d.discoverers {
if !dd.stopped() {
return false
}
}
return true
}
func (d *kubeDiscovery) runDiscover(ctx context.Context, updates chan resource, in chan<- resource) {
for {
select {
case <-ctx.Done():
return
case r := <-updates:
select {
case <-ctx.Done():
return
case in <- r:
}
}
}
}
const resyncPeriod = 10 * time.Minute
var (
myNodeName = os.Getenv("MY_NODE_NAME")
)
func (d *kubeDiscovery) setupDiscoverers(ctx context.Context) []discoverer {
node := d.client.CoreV1().Nodes()
nodeWatcher := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) { return node.List(ctx, options) },
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) { return node.Watch(ctx, options) },
}
pod := d.client.CoreV1().Pods(corev1.NamespaceAll)
podWatcher := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
if myNodeName != "" {
options.FieldSelector = "spec.nodeName=" + myNodeName
}
return pod.List(ctx, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
if myNodeName != "" {
options.FieldSelector = "spec.nodeName=" + myNodeName
}
return pod.Watch(ctx, options)
},
}
return []discoverer{
newNodeDiscoverer(cache.NewSharedInformer(nodeWatcher, &corev1.Node{}, resyncPeriod), d.Logger),
newPodDiscoverer(cache.NewSharedInformer(podWatcher, &corev1.Pod{}, resyncPeriod), d.Logger),
}
}
func enqueue(queue *workqueue.Type, obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
return
}
queue.Add(key)
}
func send(ctx context.Context, in chan<- resource, r resource) {
if r == nil {
return
}
select {
case <-ctx.Done():
case in <- r:
}
}
func isChanClosed(ch chan struct{}) bool {
select {
case <-ch:
return true
default:
return false
}
}
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