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annotations.go
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annotations.go
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package annotations
import (
"reflect"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/cache"
triggerutil "github.com/openshift/library-go/pkg/image/trigger"
"github.com/openshift/openshift-controller-manager/pkg/image/trigger"
)
// annotationTriggerIndexer uses annotations on objects to trigger changes.
type annotationTriggerIndexer struct {
prefix string
}
// NewAnnotationTriggerIndexer creates an indexer that deals with objects that have a pod spec and use
// annotations to indicate the desire to trigger.
func NewAnnotationTriggerIndexer(prefix string) trigger.Indexer {
return annotationTriggerIndexer{prefix: prefix}
}
func (i annotationTriggerIndexer) Index(obj, old interface{}) (string, *trigger.CacheEntry, cache.DeltaType, error) {
var (
triggers []triggerutil.ObjectFieldTrigger
key string
namespace string
change cache.DeltaType
)
switch {
case obj != nil && old == nil:
// added
m, err := meta.Accessor(obj)
if err != nil {
return "", nil, change, err
}
key, namespace, triggers, err = triggerutil.CalculateAnnotationTriggers(m, i.prefix)
if err != nil {
return "", nil, change, err
}
change = cache.Added
case old != nil && obj == nil:
// deleted
m, err := meta.Accessor(old)
if err != nil {
return "", nil, change, err
}
key, namespace, triggers, err = triggerutil.CalculateAnnotationTriggers(m, i.prefix)
if err != nil {
return "", nil, change, err
}
change = cache.Deleted
default:
// updated
m, err := meta.Accessor(obj)
if err != nil {
return "", nil, change, err
}
key, namespace, triggers, err = triggerutil.CalculateAnnotationTriggers(m, i.prefix)
if err != nil {
return "", nil, change, err
}
oldM, err := meta.Accessor(old)
if err != nil {
return "", nil, change, err
}
_, _, oldTriggers, err := triggerutil.CalculateAnnotationTriggers(oldM, i.prefix)
if err != nil {
return "", nil, change, err
}
switch {
case len(oldTriggers) == 0:
change = cache.Added
case !reflect.DeepEqual(oldTriggers, triggers):
change = cache.Updated
case triggerutil.ContainerImageChanged(old.(runtime.Object), obj.(runtime.Object), triggers):
change = cache.Updated
}
}
if len(triggers) > 0 {
return key, &trigger.CacheEntry{
Key: key,
Namespace: namespace,
Triggers: triggers,
}, change, nil
}
return "", nil, change, nil
}