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/*
* Copyright (c) 2020. Ant Group. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package snapshot
import (
"context"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/snapshots"
"github.com/containerd/containerd/snapshots/storage"
"github.com/containerd/nydus-snapshotter/pkg/errdefs"
"github.com/pkg/errors"
)
type WalkFunc = func(id string, info snapshots.Info) bool
func GetSnapshotInfo(ctx context.Context, ms *storage.MetaStore, key string) (string, snapshots.Info, snapshots.Usage, error) {
ctx, t, err := ms.TransactionContext(ctx, false)
if err != nil {
return "", snapshots.Info{}, snapshots.Usage{}, err
}
defer func() {
if err := t.Rollback(); err != nil {
log.L.WithError(err).Errorf("Rollback traction %s", key)
}
}()
id, info, usage, err := storage.GetInfo(ctx, key)
if err != nil {
return "", snapshots.Info{}, snapshots.Usage{}, err
}
return id, info, usage, nil
}
func GetSnapshot(ctx context.Context, ms *storage.MetaStore, key string) (*storage.Snapshot, error) {
ctx, t, err := ms.TransactionContext(ctx, false)
if err != nil {
return nil, err
}
defer func() {
if err := t.Rollback(); err != nil {
log.L.WithError(err).Errorf("Rollback traction %s", key)
}
}()
s, err := storage.GetSnapshot(ctx, key)
if err != nil {
return nil, errors.Wrap(err, "get snapshot")
}
return &s, nil
}
// Iterate all the parents of a snapshot specified by `key`
// Stop the iteration once callback `fn` is invoked successfully and return current iterated snapshot
func IterateParentSnapshots(ctx context.Context, ms *storage.MetaStore, key string, fn WalkFunc) (string, snapshots.Info, error) {
ctx, t, err := ms.TransactionContext(ctx, false)
if err != nil {
return "", snapshots.Info{}, err
}
defer func() {
if err := t.Rollback(); err != nil {
log.L.WithError(err).Errorf("Rollback transaction %s", key)
}
}()
for cKey := key; cKey != ""; {
id, info, _, err := storage.GetInfo(ctx, cKey)
if err != nil {
log.L.WithError(err).Warnf("failed to get snapshot info of %q", cKey)
return "", snapshots.Info{}, err
}
if fn(id, info) {
return id, info, nil
}
cKey = info.Parent
}
return "", snapshots.Info{}, errdefs.ErrNotFound
}
func UpdateSnapshotInfo(ctx context.Context, ms *storage.MetaStore, info snapshots.Info, fieldPaths ...string) (snapshots.Info, error) {
ctx, t, err := ms.TransactionContext(ctx, true)
if err != nil {
return snapshots.Info{}, err
}
info, err = storage.UpdateInfo(ctx, info, fieldPaths...)
if err != nil {
if rerr := t.Rollback(); rerr != nil {
log.L.WithError(rerr).Errorf("update snapshot info")
}
return snapshots.Info{}, err
}
if err := t.Commit(); err != nil {
return snapshots.Info{}, err
}
return info, nil
}
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