kubeedge/cloud/pkg/devicecontroller/manager/common.go

package manager

import (
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/watch"
	"k8s.io/client-go/tools/cache"
	"k8s.io/klog/v2"
)

// Manager define the interface of a Manager, configmapManager and podManager implement it
type Manager interface {
	Events() chan watch.Event
}

// CommonResourceEventHandler can be used by configmapManager and podManager
type CommonResourceEventHandler struct {
	events chan watch.Event
}

func (c *CommonResourceEventHandler) obj2Event(t watch.EventType, obj interface{}) {
	eventObj, ok := obj.(runtime.Object)
	if !ok {
		klog.Warningf("unknown type: %T, ignore", obj)
		return
	}
	c.events <- watch.Event{Type: t, Object: eventObj}
}

// OnAdd handle Add event
func (c *CommonResourceEventHandler) OnAdd(obj interface{}, _ bool) {
	c.obj2Event(watch.Added, obj)
}

// OnUpdate handle Update event
func (c *CommonResourceEventHandler) OnUpdate(_, newObj interface{}) {
	c.obj2Event(watch.Modified, newObj)
}

// OnDelete handle Delete event
func (c *CommonResourceEventHandler) OnDelete(obj interface{}) {
	if tombstone, ok := obj.(cache.DeletedFinalStateUnknown); ok {
		obj = tombstone.Obj
	}
	c.obj2Event(watch.Deleted, obj)
}

// NewCommonResourceEventHandler create CommonResourceEventHandler used by configmapManager and podManager
func NewCommonResourceEventHandler(events chan watch.Event) *CommonResourceEventHandler {
	return &CommonResourceEventHandler{events: events}
}