mirror of
https://github.com/restic/restic.git
synced 2024-12-25 17:27:25 +00:00
407 lines
9.3 KiB
Go
407 lines
9.3 KiB
Go
// Package index contains various data structures for indexing content in a repository or backend.
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package index
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import (
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"context"
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"fmt"
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"os"
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"sync"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/pack"
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"github.com/restic/restic/internal/restic"
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"golang.org/x/sync/errgroup"
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)
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// Pack contains information about the contents of a pack.
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type Pack struct {
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ID restic.ID
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Size int64
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Entries []restic.Blob
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}
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// Index contains information about blobs and packs stored in a repo.
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type Index struct {
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Packs map[restic.ID]Pack
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IndexIDs restic.IDSet
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}
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func newIndex() *Index {
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return &Index{
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Packs: make(map[restic.ID]Pack),
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IndexIDs: restic.NewIDSet(),
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}
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}
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const listPackWorkers = 10
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// Lister lists files and their contents
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type Lister interface {
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// List runs fn for all files of type t in the repo.
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List(ctx context.Context, t restic.FileType, fn func(restic.ID, int64) error) error
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// ListPack returns the list of blobs saved in the pack id and the length
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// of the file as stored in the backend.
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ListPack(ctx context.Context, id restic.ID, size int64) ([]restic.Blob, int64, error)
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}
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// New creates a new index for repo from scratch. InvalidFiles contains all IDs
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// of files that cannot be listed successfully.
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func New(ctx context.Context, repo Lister, ignorePacks restic.IDSet, p *restic.Progress) (idx *Index, invalidFiles restic.IDs, err error) {
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p.Start()
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defer p.Done()
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type Job struct {
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PackID restic.ID
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Size int64
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}
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type Result struct {
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Error error
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PackID restic.ID
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Size int64
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Entries []restic.Blob
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}
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inputCh := make(chan Job)
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outputCh := make(chan Result)
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wg, ctx := errgroup.WithContext(ctx)
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// list the files in the repo, send to inputCh
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wg.Go(func() error {
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defer close(inputCh)
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return repo.List(ctx, restic.DataFile, func(id restic.ID, size int64) error {
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if ignorePacks.Has(id) {
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return nil
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}
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job := Job{
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PackID: id,
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Size: size,
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}
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select {
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case inputCh <- job:
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case <-ctx.Done():
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}
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return nil
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})
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})
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// run the workers listing the files, read from inputCh, send to outputCh
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var workers sync.WaitGroup
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for i := 0; i < listPackWorkers; i++ {
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workers.Add(1)
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go func() {
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defer workers.Done()
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for job := range inputCh {
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res := Result{PackID: job.PackID}
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res.Entries, res.Size, res.Error = repo.ListPack(ctx, job.PackID, job.Size)
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select {
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case outputCh <- res:
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case <-ctx.Done():
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return
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}
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}
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}()
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}
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// wait until all the workers are done, then close outputCh
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wg.Go(func() error {
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workers.Wait()
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close(outputCh)
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return nil
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})
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idx = newIndex()
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for res := range outputCh {
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p.Report(restic.Stat{Blobs: 1})
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if res.Error != nil {
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cause := errors.Cause(res.Error)
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if _, ok := cause.(pack.InvalidFileError); ok {
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invalidFiles = append(invalidFiles, res.PackID)
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continue
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}
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fmt.Fprintf(os.Stderr, "pack file cannot be listed %v: %v\n", res.PackID, res.Error)
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continue
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}
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debug.Log("pack %v contains %d blobs", res.PackID, len(res.Entries))
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err := idx.AddPack(res.PackID, res.Size, res.Entries)
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if err != nil {
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return nil, nil, err
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}
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select {
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case <-ctx.Done(): // an error occurred
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default:
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}
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}
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err = wg.Wait()
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if err != nil {
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return nil, nil, err
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}
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return idx, invalidFiles, nil
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}
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type packJSON struct {
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ID restic.ID `json:"id"`
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Blobs []blobJSON `json:"blobs"`
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}
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type blobJSON struct {
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ID restic.ID `json:"id"`
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Type restic.BlobType `json:"type"`
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Offset uint `json:"offset"`
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Length uint `json:"length"`
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}
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type indexJSON struct {
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Supersedes restic.IDs `json:"supersedes,omitempty"`
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Packs []packJSON `json:"packs"`
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}
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// ListLoader allows listing files and their content, in addition to loading and unmarshaling JSON files.
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type ListLoader interface {
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Lister
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LoadJSONUnpacked(context.Context, restic.FileType, restic.ID, interface{}) error
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}
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func loadIndexJSON(ctx context.Context, repo ListLoader, id restic.ID) (*indexJSON, error) {
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debug.Log("process index %v\n", id)
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var idx indexJSON
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err := repo.LoadJSONUnpacked(ctx, restic.IndexFile, id, &idx)
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if err != nil {
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return nil, err
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}
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return &idx, nil
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}
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// Load creates an index by loading all index files from the repo.
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func Load(ctx context.Context, repo ListLoader, p *restic.Progress) (*Index, error) {
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debug.Log("loading indexes")
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p.Start()
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defer p.Done()
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supersedes := make(map[restic.ID]restic.IDSet)
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results := make(map[restic.ID]map[restic.ID]Pack)
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index := newIndex()
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err := repo.List(ctx, restic.IndexFile, func(id restic.ID, size int64) error {
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p.Report(restic.Stat{Blobs: 1})
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debug.Log("Load index %v", id)
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idx, err := loadIndexJSON(ctx, repo, id)
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if err != nil {
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return err
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}
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res := make(map[restic.ID]Pack)
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supersedes[id] = restic.NewIDSet()
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for _, sid := range idx.Supersedes {
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debug.Log(" index %v supersedes %v", id, sid)
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supersedes[id].Insert(sid)
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}
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for _, jpack := range idx.Packs {
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entries := make([]restic.Blob, 0, len(jpack.Blobs))
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for _, blob := range jpack.Blobs {
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entry := restic.Blob{
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ID: blob.ID,
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Type: blob.Type,
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Offset: blob.Offset,
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Length: blob.Length,
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}
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entries = append(entries, entry)
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}
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if err = index.AddPack(jpack.ID, 0, entries); err != nil {
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return err
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}
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}
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results[id] = res
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index.IndexIDs.Insert(id)
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return nil
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})
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if err != nil {
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return nil, err
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}
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for superID, list := range supersedes {
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for indexID := range list {
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if _, ok := results[indexID]; !ok {
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continue
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}
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debug.Log(" removing index %v, superseded by %v", indexID, superID)
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fmt.Fprintf(os.Stderr, "index %v can be removed, superseded by index %v\n", indexID.Str(), superID.Str())
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delete(results, indexID)
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}
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}
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return index, nil
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}
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// AddPack adds a pack to the index. If this pack is already in the index, an
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// error is returned.
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func (idx *Index) AddPack(id restic.ID, size int64, entries []restic.Blob) error {
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if _, ok := idx.Packs[id]; ok {
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return errors.Errorf("pack %v already present in the index", id.Str())
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}
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idx.Packs[id] = Pack{ID: id, Size: size, Entries: entries}
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return nil
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}
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// RemovePack deletes a pack from the index.
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func (idx *Index) RemovePack(id restic.ID) error {
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if _, ok := idx.Packs[id]; !ok {
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return errors.Errorf("pack %v not found in the index", id.Str())
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}
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delete(idx.Packs, id)
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return nil
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}
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// DuplicateBlobs returns a list of blobs that are stored more than once in the
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// repo.
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func (idx *Index) DuplicateBlobs() (dups restic.BlobSet) {
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dups = restic.NewBlobSet()
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seen := restic.NewBlobSet()
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for _, p := range idx.Packs {
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for _, entry := range p.Entries {
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h := restic.BlobHandle{ID: entry.ID, Type: entry.Type}
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if seen.Has(h) {
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dups.Insert(h)
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}
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seen.Insert(h)
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}
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}
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return dups
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}
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// PacksForBlobs returns the set of packs in which the blobs are contained.
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func (idx *Index) PacksForBlobs(blobs restic.BlobSet) (packs restic.IDSet) {
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packs = restic.NewIDSet()
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for id, p := range idx.Packs {
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for _, entry := range p.Entries {
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if blobs.Has(restic.BlobHandle{ID: entry.ID, Type: entry.Type}) {
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packs.Insert(id)
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}
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}
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}
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return packs
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}
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// Location describes the location of a blob in a pack.
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type Location struct {
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PackID restic.ID
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restic.Blob
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}
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// ErrBlobNotFound is return by FindBlob when the blob could not be found in
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// the index.
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var ErrBlobNotFound = errors.New("blob not found in index")
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// FindBlob returns a list of packs and positions the blob can be found in.
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func (idx *Index) FindBlob(h restic.BlobHandle) (result []Location, err error) {
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for id, p := range idx.Packs {
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for _, entry := range p.Entries {
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if entry.ID.Equal(h.ID) && entry.Type == h.Type {
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result = append(result, Location{
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PackID: id,
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Blob: entry,
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})
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}
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}
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}
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if len(result) == 0 {
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return nil, ErrBlobNotFound
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}
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return result, nil
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}
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const maxEntries = 3000
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// Saver saves structures as JSON.
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type Saver interface {
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SaveJSONUnpacked(ctx context.Context, t restic.FileType, item interface{}) (restic.ID, error)
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}
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// Save writes the complete index to the repo.
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func (idx *Index) Save(ctx context.Context, repo Saver, supersedes restic.IDs) (restic.IDs, error) {
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debug.Log("pack files: %d\n", len(idx.Packs))
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var indexIDs []restic.ID
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packs := 0
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jsonIDX := &indexJSON{
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Supersedes: supersedes,
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Packs: make([]packJSON, 0, maxEntries),
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}
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for packID, pack := range idx.Packs {
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debug.Log("%04d add pack %v with %d entries", packs, packID, len(pack.Entries))
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b := make([]blobJSON, 0, len(pack.Entries))
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for _, blob := range pack.Entries {
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b = append(b, blobJSON{
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ID: blob.ID,
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Type: blob.Type,
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Offset: blob.Offset,
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Length: blob.Length,
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})
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}
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p := packJSON{
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ID: packID,
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Blobs: b,
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}
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jsonIDX.Packs = append(jsonIDX.Packs, p)
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packs++
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if packs == maxEntries {
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id, err := repo.SaveJSONUnpacked(ctx, restic.IndexFile, jsonIDX)
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if err != nil {
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return nil, err
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}
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debug.Log("saved new index as %v", id)
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indexIDs = append(indexIDs, id)
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packs = 0
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jsonIDX.Packs = jsonIDX.Packs[:0]
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}
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}
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if packs > 0 {
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id, err := repo.SaveJSONUnpacked(ctx, restic.IndexFile, jsonIDX)
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if err != nil {
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return nil, err
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}
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debug.Log("saved new index as %v", id)
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indexIDs = append(indexIDs, id)
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}
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return indexIDs, nil
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}
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