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event_handlers.go
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event_handlers.go
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package k8s
import (
"reflect"
"github.com/rs/zerolog"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/client-go/tools/cache"
"github.com/flomesh-io/fsm/pkg/announcements"
"github.com/flomesh-io/fsm/pkg/k8s/events"
"github.com/flomesh-io/fsm/pkg/messaging"
"github.com/flomesh-io/fsm/pkg/metricsstore"
)
// observeFilter returns true for YES observe and false for NO do not pay attention to this
// This filter could be added optionally by anything using GetEventHandlerFuncs()
type observeFilter func(obj interface{}) bool
// EventTypes is a struct helping pass the correct types to GetEventHandlerFuncs()
type EventTypes struct {
Add announcements.Kind
Update announcements.Kind
Delete announcements.Kind
}
// GetEventHandlerFuncs returns the ResourceEventHandlerFuncs object used to receive events when a k8s
// object is added/updated/deleted.
func GetEventHandlerFuncs(shouldObserve observeFilter, eventTypes EventTypes, msgBroker *messaging.Broker) cache.ResourceEventHandlerFuncs {
if shouldObserve == nil {
shouldObserve = func(obj interface{}) bool { return true }
}
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if !shouldObserve(obj) {
return
}
logResourceEvent(log, eventTypes.Add, obj)
ns := getNamespace(obj)
metricsstore.DefaultMetricsStore.K8sAPIEventCounter.WithLabelValues(eventTypes.Add.String(), ns).Inc()
msgBroker.GetQueue().AddRateLimited(events.PubSubMessage{
Kind: eventTypes.Add,
NewObj: obj,
OldObj: nil,
})
},
UpdateFunc: func(oldObj, newObj interface{}) {
if !shouldObserve(newObj) {
return
}
logResourceEvent(log, eventTypes.Update, newObj)
ns := getNamespace(newObj)
metricsstore.DefaultMetricsStore.K8sAPIEventCounter.WithLabelValues(eventTypes.Update.String(), ns).Inc()
msgBroker.GetQueue().AddRateLimited(events.PubSubMessage{
Kind: eventTypes.Update,
NewObj: newObj,
OldObj: oldObj,
})
},
DeleteFunc: func(obj interface{}) {
if !shouldObserve(obj) {
return
}
logResourceEvent(log, eventTypes.Delete, obj)
ns := getNamespace(obj)
metricsstore.DefaultMetricsStore.K8sAPIEventCounter.WithLabelValues(eventTypes.Delete.String(), ns).Inc()
msgBroker.GetQueue().AddRateLimited(events.PubSubMessage{
Kind: eventTypes.Delete,
NewObj: nil,
OldObj: obj,
})
},
}
}
func getNamespace(obj interface{}) string {
return reflect.ValueOf(obj).Elem().FieldByName("ObjectMeta").FieldByName("Namespace").String()
}
func logResourceEvent(parent zerolog.Logger, event announcements.Kind, obj interface{}) {
log := parent.With().Str("event", event.String()).Logger()
o, err := meta.Accessor(obj)
if err != nil {
log.Error().Err(err).Msg("error parsing object, ignoring")
return
}
name := o.GetName()
if o.GetNamespace() != "" {
name = o.GetNamespace() + "/" + name
}
log.Debug().Str("resource_name", name).Msg("received kubernetes resource event")
}