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types.go
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types.go
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// Copyright 2014-2016 Amazon.com, Inc. or its affiliates. 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. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 image
import (
"fmt"
"sync"
"time"
"github.com/aws/amazon-ecs-agent/agent/api"
"github.com/cihub/seelog"
)
type Image struct {
ImageID string
Names []string
Size int64
}
// ImageState represents a docker image
// and its state information such as containers associated with it
type ImageState struct {
Image *Image
Containers []*api.Container `json:"-"`
PulledAt time.Time
LastUsedAt time.Time
updateLock sync.RWMutex
}
func (imageState *ImageState) UpdateContainerReference(container *api.Container) {
imageState.updateLock.Lock()
defer imageState.updateLock.Unlock()
seelog.Infof("Updating container reference %v in Image State - %v", container.Name, imageState.Image.ImageID)
imageState.Containers = append(imageState.Containers, container)
}
func (imageState *ImageState) AddImageName(imageName string) {
imageState.updateLock.Lock()
defer imageState.updateLock.Unlock()
if !imageState.HasImageName(imageName) {
seelog.Infof("Adding image name- %v to Image state- %v", imageName, imageState.Image.ImageID)
imageState.Image.Names = append(imageState.Image.Names, imageName)
}
}
func (imageState *ImageState) HasNoAssociatedContainers() bool {
return len(imageState.Containers) == 0
}
func (imageState *ImageState) UpdateImageState(container *api.Container) {
imageState.AddImageName(container.Image)
imageState.UpdateContainerReference(container)
}
func (imageState *ImageState) RemoveImageName(containerImageName string) {
imageState.updateLock.Lock()
defer imageState.updateLock.Unlock()
for i, imageName := range imageState.Image.Names {
if imageName == containerImageName {
imageState.Image.Names = append(imageState.Image.Names[:i], imageState.Image.Names[i+1:]...)
}
}
}
func (imageState *ImageState) HasImageName(containerImageName string) bool {
for _, imageName := range imageState.Image.Names {
if imageName == containerImageName {
return true
}
}
return false
}
func (imageState *ImageState) RemoveContainerReference(container *api.Container) error {
// Get the image state write lock for updating container reference
imageState.updateLock.Lock()
defer imageState.updateLock.Unlock()
for i, _ := range imageState.Containers {
if imageState.Containers[i].Name == container.Name {
// Container reference found; hence remove it
seelog.Infof("Removing Container Reference: %v from Image State- %v", container.Name, imageState.Image.ImageID)
imageState.Containers = append(imageState.Containers[:i], imageState.Containers[i+1:]...)
// Update the last used time for the image
imageState.LastUsedAt = time.Now()
return nil
}
}
return fmt.Errorf("Container reference is not found in the image state container: %s", container.String())
}