/
configmap.go
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/
configmap.go
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package source
import (
"context"
"fmt"
"sync"
"time"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"sigs.k8s.io/yaml"
)
const defaultImagesKey = "images"
const imagesKeyAnnotation = "image-cache-daemon/key"
type OptFn func(cms *ConfigMapSource)
func WithLogger(logger *logrus.Logger) OptFn {
return func(cms *ConfigMapSource) {
cms.logger = logger
}
}
func WithConfigMapSelector(selector string) OptFn {
return func(cms *ConfigMapSource) {
cms.configmapSelector = selector
}
}
func getImagesFromConfigMap(obj interface{}) (map[string]bool, error) {
cm, ok := obj.(*corev1.ConfigMap)
if !ok {
return nil, fmt.Errorf("could not cast input to corev1.ConfigMap")
}
imagesKey := defaultImagesKey
if value, ok := cm.Annotations[imagesKeyAnnotation]; ok {
imagesKey = value
}
imageMap := make(map[string]bool)
if imagesStr, ok := cm.Data[imagesKey]; ok {
var images []string
if err := yaml.Unmarshal([]byte(imagesStr), &images); err != nil {
return nil, fmt.Errorf("failed to unmarshal key %s in configmap %s/%s: %v", imagesKey, cm.Namespace, cm.Name, err)
}
for _, i := range images {
imageMap[i] = true
}
}
return imageMap, nil
}
type ConfigMapSource struct {
configmapSelector string
logger *logrus.Logger
client kubernetes.Interface
imageCh chan string
imageMap map[string]bool
informer cache.SharedIndexInformer
images []string
resyncPeriod time.Duration
lock sync.RWMutex
}
func (cms *ConfigMapSource) ImageCh() <-chan string {
return cms.imageCh
}
func (cms *ConfigMapSource) Images() []string {
cms.lock.RLock()
defer cms.lock.RUnlock()
return cms.images
}
func (*ConfigMapSource) Name() string {
return "ConfigMap"
}
func (cms *ConfigMapSource) updateImagesFromInformer() {
cms.imageMap = cms.getImagesFromInformer()
var images []string
for key := range cms.imageMap {
images = append(images, key)
}
cms.images = images
}
func (cms *ConfigMapSource) getImagesFromInformer() map[string]bool {
imageMap := make(map[string]bool)
if cms.informer != nil {
indexer := cms.informer.GetIndexer()
for _, key := range indexer.ListKeys() {
value, exists, err := indexer.GetByKey(key)
if !exists {
logrus.Warnf("key %s did not exist in indexer", key)
} else if err != nil {
logrus.Errorf("failed to retrieve key %s from indexer: %v", key, err)
} else {
images, err := getImagesFromConfigMap(value)
if err != nil {
cms.logger.Errorf("failed to get images from configmap: %v", err)
continue
}
for image := range images {
imageMap[image] = true
}
}
}
}
return imageMap
}
func (cms *ConfigMapSource) Run(ctx context.Context) {
cms.informer.AddEventHandlerWithResyncPeriod(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
imageMap, err := getImagesFromConfigMap(obj)
if err != nil {
cms.logger.Errorf("failed to get images from configmap: %v", err)
return
}
cms.lock.Lock()
defer cms.lock.Unlock()
for key := range imageMap {
if _, exists := cms.imageMap[key]; !exists {
cms.imageMap[key] = true
cms.images = append(cms.images, key)
cms.imageCh <- key
}
}
},
UpdateFunc: func(oldObj, newObj interface{}) {
currentImages, err := getImagesFromConfigMap(newObj)
if err != nil {
cms.logger.Errorf("failed to get images from configmap: %v", err)
return
}
previousImages, err := getImagesFromConfigMap(oldObj)
if err != nil {
cms.logger.Errorf("failed to get images from configmap: %v", err)
cms.logger.Warn("skipping deletion detection, could not parse prior images from configmap")
previousImages = currentImages
}
deletedImages := setDifference(previousImages, currentImages)
cms.lock.Lock()
defer cms.lock.Unlock()
newImages := setDifference(currentImages, cms.imageMap)
for _, image := range newImages {
cms.imageMap[image] = true
cms.images = append(cms.images, image)
cms.imageCh <- image
}
if len(deletedImages) > 0 {
cms.updateImagesFromInformer()
}
},
DeleteFunc: func(obj interface{}) {
cms.lock.Lock()
defer cms.lock.Unlock()
cms.updateImagesFromInformer()
},
}, cms.resyncPeriod)
cms.informer.Run(ctx.Done())
close(cms.imageCh)
}
func (cms *ConfigMapSource) HasSynced() bool {
if cms.informer != nil {
return cms.informer.HasSynced()
}
return false
}
func NewConfigMapSource(client kubernetes.Interface, resyncPeriod time.Duration, opts ...OptFn) ImageSource {
cms := &ConfigMapSource{
imageCh: make(chan string),
imageMap: make(map[string]bool),
images: make([]string, 0),
client: client,
logger: logrus.StandardLogger(),
lock: sync.RWMutex{},
resyncPeriod: resyncPeriod,
}
for _, fn := range opts {
fn(cms)
}
fac := informers.NewSharedInformerFactoryWithOptions(client, resyncPeriod, informers.WithTweakListOptions(func(lo *v1.ListOptions) {
lo.LabelSelector = fields.ParseSelectorOrDie(cms.configmapSelector).String()
}))
cms.informer = fac.Core().V1().ConfigMaps().Informer()
return cms
}