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leasemanager.go
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/
leasemanager.go
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package snapshot
import (
"context"
"sync"
"github.com/containerd/containerd/leases"
"github.com/sirupsen/logrus"
bolt "go.etcd.io/bbolt"
)
type sLM struct {
manager leases.Manager
s *snapshotter
mu sync.Mutex
byLease map[string]map[string]struct{}
bySnapshot map[string]map[string]struct{}
}
func newLeaseManager(s *snapshotter, lm leases.Manager) *sLM {
return &sLM{
s: s,
manager: lm,
byLease: map[string]map[string]struct{}{},
bySnapshot: map[string]map[string]struct{}{},
}
}
func (l *sLM) Create(ctx context.Context, opts ...leases.Opt) (leases.Lease, error) {
return l.manager.Create(ctx, opts...)
}
func (l *sLM) Delete(ctx context.Context, lease leases.Lease, opts ...leases.DeleteOpt) error {
if err := l.manager.Delete(ctx, lease, opts...); err != nil {
return err
}
l.mu.Lock()
if snaps, ok := l.byLease[lease.ID]; ok {
for sID := range snaps {
l.delRef(lease.ID, sID)
}
}
l.mu.Unlock()
return nil
}
func (l *sLM) List(ctx context.Context, filters ...string) ([]leases.Lease, error) {
return l.manager.List(ctx, filters...)
}
func (l *sLM) AddResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
if err := l.manager.AddResource(ctx, lease, resource); err != nil {
return err
}
if resource.Type == "snapshots/default" {
l.mu.Lock()
l.addRef(lease.ID, resource.ID)
l.mu.Unlock()
}
return nil
}
func (l *sLM) DeleteResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
if err := l.manager.DeleteResource(ctx, lease, resource); err != nil {
return err
}
if resource.Type == "snapshots/default" {
l.mu.Lock()
l.delRef(lease.ID, resource.ID)
l.mu.Unlock()
}
return nil
}
func (l *sLM) ListResources(ctx context.Context, lease leases.Lease) ([]leases.Resource, error) {
return l.manager.ListResources(ctx, lease)
}
func (l *sLM) addRef(lID, sID string) {
load := false
snapshots, ok := l.byLease[lID]
if !ok {
snapshots = map[string]struct{}{}
l.byLease[lID] = snapshots
}
if _, ok := snapshots[sID]; !ok {
snapshots[sID] = struct{}{}
}
leases, ok := l.bySnapshot[sID]
if !ok {
leases = map[string]struct{}{}
l.byLease[sID] = leases
load = true
}
if _, ok := leases[lID]; !ok {
leases[lID] = struct{}{}
}
if load {
l.s.getLayer(sID, true)
if _, ok := l.s.chainID(sID); ok {
l.s.db.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists([]byte(lID))
if err != nil {
return err
}
return b.Put(keyChainID, []byte(sID))
})
}
}
}
func (l *sLM) delRef(lID, sID string) {
snapshots, ok := l.byLease[lID]
if !ok {
delete(snapshots, sID)
if len(snapshots) == 0 {
delete(l.byLease, lID)
}
}
leases, ok := l.bySnapshot[sID]
if !ok {
delete(leases, lID)
if len(leases) == 0 {
delete(l.bySnapshot, sID)
if err := l.s.remove(context.TODO(), sID); err != nil {
logrus.Warnf("failed to remove snapshot %v", sID)
}
}
}
}