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cleaner.go
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/
cleaner.go
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package cleaner
import (
"sync"
"code.cloudfoundry.org/garden-shed/layercake"
"code.cloudfoundry.org/lager"
)
type OvenCleaner struct {
GraphCleanupThreshold Threshold
retainCheck Checker
}
type Checker interface {
Check(id layercake.ID) bool
}
type RetainChecker interface {
layercake.Retainer
Checker
}
//go:generate counterfeiter . Threshold
type Threshold interface {
Exceeded(log lager.Logger, cake layercake.Cake) bool
}
func NewOvenCleaner(retainCheck Checker, graphCleanupThreshold Threshold) *OvenCleaner {
return &OvenCleaner{
GraphCleanupThreshold: graphCleanupThreshold,
retainCheck: retainCheck,
}
}
func (g *OvenCleaner) GC(log lager.Logger, cake layercake.Cake) error {
log = log.Session("gc")
log.Info("start")
defer log.Info("finished")
if exceeded := g.GraphCleanupThreshold.Exceeded(log, cake); !exceeded {
log.Debug("threshold-not-exceeded")
return nil
}
ids, err := cake.GetAllLeaves()
if err != nil {
return err
}
for _, id := range ids {
if err := g.removeRecursively(log, cake, id); err != nil {
return err
}
}
return nil
}
func (g *OvenCleaner) removeRecursively(log lager.Logger, cake layercake.Cake, id layercake.ID) error {
log = log.Session("remove-recursively", lager.Data{"id": id})
log.Debug("start")
defer log.Debug("finished")
if g.retainCheck.Check(id) {
log.Debug("layer-is-held")
return nil
}
img, err := cake.Get(id)
if err != nil {
log.Error("get-image-failed", err)
return nil
}
if img.Container != "" {
log.Debug("image-is-container", lager.Data{"id": id, "container": img.Container})
return nil
}
if err := cake.Remove(id); err != nil {
log.Error("remove-image-failed", err)
return err
}
if img.Parent == "" {
log.Debug("stop-image-has-no-parent")
return nil
}
if leaf, err := cake.IsLeaf(layercake.DockerImageID(img.Parent)); err == nil && leaf {
log.Debug("has-parent-leaf", lager.Data{"parent-id": img.Parent})
return g.removeRecursively(log, cake, layercake.DockerImageID(img.Parent))
}
return nil
}
type retainer struct {
retainedImages map[string]struct{}
retainedImagesMu sync.RWMutex
}
func NewRetainer() *retainer {
return &retainer{}
}
func (g *retainer) Retain(log lager.Logger, id layercake.ID) {
g.retainedImagesMu.Lock()
defer g.retainedImagesMu.Unlock()
if g.retainedImages == nil {
g.retainedImages = make(map[string]struct{})
}
g.retainedImages[id.GraphID()] = struct{}{}
}
func (g *retainer) Check(id layercake.ID) bool {
g.retainedImagesMu.Lock()
defer g.retainedImagesMu.Unlock()
if g.retainedImages == nil {
return false
}
_, ok := g.retainedImages[id.GraphID()]
return ok
}
type CheckFunc func(id layercake.ID) bool
func (fn CheckFunc) Check(id layercake.ID) bool { return fn(id) }