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manager.go
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manager.go
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// Package snapshot manages metadata about snapshots stored in repository.
package snapshot
import (
"context"
"github.com/pkg/errors"
"github.com/kopia/kopia/repo"
"github.com/kopia/kopia/repo/logging"
"github.com/kopia/kopia/repo/manifest"
"github.com/kopia/kopia/repo/object"
)
// ManifestType is the value of the "type" label for snapshot manifests.
const ManifestType = "snapshot"
// Manifest labels identifying snapshots.
const (
UsernameLabel = "username"
HostnameLabel = "hostname"
PathLabel = "path"
)
// ErrSnapshotNotFound is returned when a snapshot is not found.
var ErrSnapshotNotFound = errors.Errorf("snapshot not found")
const (
typeKey = manifest.TypeLabelKey
loadSnapshotsConcurrency = 50 // number of snapshots to load in parallel
)
var log = logging.Module("kopia/snapshot")
// ListSources lists all snapshot sources in a given repository.
func ListSources(ctx context.Context, rep repo.Repository) ([]SourceInfo, error) {
items, err := rep.FindManifests(ctx, map[string]string{
typeKey: ManifestType,
})
if err != nil {
return nil, errors.Wrap(err, "unable to find manifest entries")
}
uniq := map[SourceInfo]bool{}
for _, it := range items {
uniq[sourceInfoFromLabels(it.Labels)] = true
}
var infos []SourceInfo
for k := range uniq {
infos = append(infos, k)
}
return infos, nil
}
func sourceInfoFromLabels(labels map[string]string) SourceInfo {
return SourceInfo{Host: labels[HostnameLabel], UserName: labels[UsernameLabel], Path: labels[PathLabel]}
}
func sourceInfoToLabels(si SourceInfo) map[string]string {
m := map[string]string{
typeKey: ManifestType,
HostnameLabel: si.Host,
}
if si.UserName != "" {
m[UsernameLabel] = si.UserName
}
if si.Path != "" {
m[PathLabel] = si.Path
}
return m
}
// ListSnapshots lists all snapshots for a given source.
func ListSnapshots(ctx context.Context, rep repo.Repository, si SourceInfo) ([]*Manifest, error) {
entries, err := rep.FindManifests(ctx, sourceInfoToLabels(si))
if err != nil {
return nil, errors.Wrap(err, "unable to find manifest entries")
}
return LoadSnapshots(ctx, rep, entryIDs(entries))
}
// LoadSnapshot loads and parses a snapshot with a given ID.
func LoadSnapshot(ctx context.Context, rep repo.Repository, manifestID manifest.ID) (*Manifest, error) {
sm := &Manifest{}
em, err := rep.GetManifest(ctx, manifestID, sm)
if err != nil {
if errors.Is(err, manifest.ErrNotFound) {
return nil, ErrSnapshotNotFound
}
return nil, errors.Wrap(err, "unable to find manifest entries")
}
if em.Labels[manifest.TypeLabelKey] != ManifestType {
return nil, errors.Errorf("manifest is not a snapshot")
}
sm.ID = manifestID
return sm, nil
}
// SaveSnapshot persists given snapshot manifest and returns manifest ID.
func SaveSnapshot(ctx context.Context, rep repo.RepositoryWriter, man *Manifest) (manifest.ID, error) {
if man.Source.Host == "" {
return "", errors.New("missing host")
}
if man.Source.UserName == "" {
return "", errors.New("missing username")
}
if man.Source.Path == "" {
return "", errors.New("missing path")
}
// clear manifest ID in case it was set, since we'll be generating a new one and we don't want
// to write previous ID in JSON.
man.ID = ""
labels := sourceInfoToLabels(man.Source)
for key, value := range man.Tags {
if _, ok := labels[key]; ok {
return "", errors.Errorf("Invalid or duplicate tag <key> found in snapshot. (%s)", key)
}
labels[key] = value
}
id, err := rep.PutManifest(ctx, labels, man)
if err != nil {
return "", errors.Wrap(err, "error putting manifest")
}
man.ID = id
return id, nil
}
// LoadSnapshots efficiently loads and parses a given list of snapshot IDs.
func LoadSnapshots(ctx context.Context, rep repo.Repository, manifestIDs []manifest.ID) ([]*Manifest, error) {
result := make([]*Manifest, len(manifestIDs))
sem := make(chan bool, loadSnapshotsConcurrency)
for i, n := range manifestIDs {
sem <- true
go func(i int, n manifest.ID) {
defer func() { <-sem }()
m, err := LoadSnapshot(ctx, rep, n)
if err != nil {
log(ctx).Errorf("unable to parse snapshot manifest %v: %v", n, err)
return
}
result[i] = m
}(i, n)
}
for range cap(sem) {
sem <- true
}
close(sem)
successful := result[:0]
for _, m := range result {
if m != nil {
successful = append(successful, m)
}
}
return successful, nil
}
// ListSnapshotManifests returns the list of snapshot manifests for a given source or all sources if nil.
func ListSnapshotManifests(ctx context.Context, rep repo.Repository, src *SourceInfo, tags map[string]string) ([]manifest.ID, error) {
labels := map[string]string{
typeKey: ManifestType,
}
if src != nil {
labels = sourceInfoToLabels(*src)
}
for key, value := range tags {
labels[key] = value
}
entries, err := rep.FindManifests(ctx, labels)
if err != nil {
return nil, errors.Wrap(err, "unable to find snapshot manifests")
}
return entryIDs(entries), nil
}
// FindSnapshotsByRootObjectID returns the list of matching snapshots for a given rootID.
func FindSnapshotsByRootObjectID(ctx context.Context, rep repo.Repository, rootID object.ID) ([]*Manifest, error) {
ids, err := ListSnapshotManifests(ctx, rep, nil, nil)
if err != nil {
return nil, errors.Wrap(err, "error listing snapshot manifests")
}
manifests, err := LoadSnapshots(ctx, rep, ids)
if err != nil {
return nil, errors.Wrap(err, "error loading snapshot manifests")
}
var result []*Manifest
for _, m := range manifests {
if m.RootObjectID() == rootID {
result = append(result, m)
}
}
return result, nil
}
// UpdateSnapshot updates the snapshot by saving the provided data and deleting old manifest ID.
func UpdateSnapshot(ctx context.Context, rep repo.RepositoryWriter, m *Manifest) error {
oldID := m.ID
newID, err := SaveSnapshot(ctx, rep, m)
if err != nil {
return errors.Wrap(err, "error saving snapshot")
}
if oldID != newID {
if err := rep.DeleteManifest(ctx, oldID); err != nil {
return errors.Wrap(err, "error deleting old manifest")
}
}
return nil
}
func entryIDs(entries []*manifest.EntryMetadata) []manifest.ID {
var ids []manifest.ID
for _, e := range entries {
ids = append(ids, e.ID)
}
return ids
}