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/
image.go
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/
image.go
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// Copyright (c) 2018-2019 Sylabs, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package index
import (
"fmt"
"sync"
"github.com/sylabs/singularity-cri/pkg/image"
"github.com/sylabs/singularity-cri/pkg/truncindex"
)
// ImageIndex provides a convenient and thread-safe way for storing images.
type ImageIndex struct {
indx *truncindex.TruncIndex
mu sync.RWMutex
refToID map[string]string
}
// NewImageIndex returns new ImageIndex ready to use.
func NewImageIndex() *ImageIndex {
return &ImageIndex{
indx: truncindex.NewTruncIndex(image.IDLen),
refToID: make(map[string]string),
}
}
// Find searches for expectImage info by its ID or prefix or any of tags.
// This method may return error if prefix is not long enough to identify expectImage uniquely.
// If image is not found ErrNotFound is returned.
func (i *ImageIndex) Find(id string) (*image.Info, error) {
info, err := i.find(id)
if err == ErrNotFound {
id = i.readRef(image.NormalizedImageRef(id))
if id == "" {
return nil, ErrNotFound
}
info, err = i.find(id)
}
return info, err
}
// Add adds the given image info to the index.
// If image with the same ID already exists it updates old image info appropriately.
func (i *ImageIndex) Add(image *image.Info) error {
oldImage, err := i.Find(image.ID)
if err != nil && err != ErrNotFound {
return fmt.Errorf("could not find old image: %v", err)
}
if err == ErrNotFound {
return i.add(image)
}
return i.merge(oldImage, image)
}
// Remove removes pod from index if it present or returns otherwise.
func (i *ImageIndex) Remove(id string) error {
imgInfo, err := i.Find(id)
if err != nil {
return err
}
err = i.indx.Delete(imgInfo.ID)
if err != nil {
return fmt.Errorf("could not remove image: %v", err)
}
i.removeRefs(imgInfo.Ref.Tags()...)
i.removeRefs(imgInfo.Ref.Digests()...)
return nil
}
// Iterate calls handler func on each pod registered in index.
func (i *ImageIndex) Iterate(handler func(image *image.Info)) {
innerIterate := func(key string, item interface{}) {
handler(item.(*image.Info))
}
i.indx.Iterate(innerIterate)
}
func (i *ImageIndex) find(id string) (*image.Info, error) {
item, err := i.indx.Get(id)
if err == truncindex.ErrNotFound {
return nil, ErrNotFound
}
if err != nil {
return nil, fmt.Errorf("could not search index: %v", err)
}
info, _ := item.(*image.Info)
return info, nil
}
func (i *ImageIndex) add(image *image.Info) error {
if err := i.removeOverlapRefs(image); err != nil {
return nil
}
err := i.indx.Add(image.ID, image)
if err != nil {
return fmt.Errorf("could not add image: %v", err)
}
for _, tag := range image.Ref.Tags() {
i.setRef(tag, image.ID)
}
for _, digest := range image.Ref.Digests() {
i.setRef(digest, image.ID)
}
return nil
}
func (i *ImageIndex) merge(oldImage, image *image.Info) error {
oldImage.Ref.AddTags(image.Ref.Tags())
oldImage.Ref.AddDigests(image.Ref.Digests())
for _, tag := range image.Ref.Tags() {
oldID := i.readRef(tag)
i.setRef(tag, image.ID)
if oldID != "" && oldID != image.ID {
oldInfo, _ := i.Find(image.ID)
oldInfo.Ref.RemoveTag(tag)
}
}
for _, digest := range image.Ref.Digests() {
oldID := i.readRef(digest)
i.setRef(digest, image.ID)
if oldID != "" && oldID == image.ID {
oldInfo, _ := i.Find(image.ID)
oldInfo.Ref.RemoveDigest(digest)
}
}
return nil
}
func (i *ImageIndex) removeOverlapRefs(image *image.Info) error {
for _, tag := range image.Ref.Tags() {
oldID := i.readRef(tag)
if oldID != "" {
oldImg, err := i.find(oldID)
if err != nil {
return err
}
oldImg.Ref.RemoveTag(tag)
}
}
for _, digest := range image.Ref.Digests() {
oldID := i.readRef(digest)
if oldID != "" {
oldImg, err := i.find(oldID)
if err != nil {
return err
}
oldImg.Ref.RemoveDigest(digest)
}
}
return nil
}
func (i *ImageIndex) readRef(ref string) string {
i.mu.RLock()
defer i.mu.RUnlock()
return i.refToID[ref]
}
func (i *ImageIndex) setRef(ref, id string) {
i.mu.Lock()
defer i.mu.Unlock()
i.refToID[ref] = id
}
func (i *ImageIndex) removeRefs(refs ...string) {
i.mu.Lock()
defer i.mu.Unlock()
for _, ref := range refs {
delete(i.refToID, ref)
}
}