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// SPDX-License-Identifier: GPL-3.0-or-later
package k8s_state
import (
"context"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
func newNodeDiscoverer(si cache.SharedInformer, l *logger.Logger) *nodeDiscoverer {
if si == nil {
panic("nil node shared informer")
}
queue := workqueue.NewWithConfig(workqueue.QueueConfig{Name: "node"})
_, _ = si.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { enqueue(queue, obj) },
UpdateFunc: func(_, obj interface{}) { enqueue(queue, obj) },
DeleteFunc: func(obj interface{}) { enqueue(queue, obj) },
})
return &nodeDiscoverer{
Logger: l,
informer: si,
queue: queue,
readyCh: make(chan struct{}),
stopCh: make(chan struct{}),
}
}
type nodeResource struct {
src string
val interface{}
}
func (r nodeResource) source() string { return r.src }
func (r nodeResource) kind() kubeResourceKind { return kubeResourceNode }
func (r nodeResource) value() interface{} { return r.val }
type nodeDiscoverer struct {
*logger.Logger
informer cache.SharedInformer
queue *workqueue.Type
readyCh chan struct{}
stopCh chan struct{}
}
func (d *nodeDiscoverer) run(ctx context.Context, in chan<- resource) {
d.Info("node_discoverer is started")
defer func() { close(d.stopCh); d.Info("node_discoverer is stopped") }()
defer d.queue.ShutDown()
go d.informer.Run(ctx.Done())
if !cache.WaitForCacheSync(ctx.Done(), d.informer.HasSynced) {
return
}
go d.runDiscover(ctx, in)
close(d.readyCh)
<-ctx.Done()
}
func (d *nodeDiscoverer) ready() bool { return isChanClosed(d.readyCh) }
func (d *nodeDiscoverer) stopped() bool { return isChanClosed(d.stopCh) }
func (d *nodeDiscoverer) runDiscover(ctx context.Context, in chan<- resource) {
for {
item, shutdown := d.queue.Get()
if shutdown {
return
}
func() {
defer d.queue.Done(item)
key := item.(string)
_, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return
}
item, exists, err := d.informer.GetStore().GetByKey(key)
if err != nil {
return
}
r := &nodeResource{src: nodeSource(name)}
if exists {
r.val = item
}
send(ctx, in, r)
}()
}
}
func nodeSource(name string) string {
return "k8s/node/" + name
}
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