Golang Progress.Start方法代码示例

// Scan traverses the dirs to collect restic.Stat information while emitting progress
// information with p.
func Scan(dirs []string, filter pipe.SelectFunc, p *restic.Progress) (restic.Stat, error) {
	p.Start()
	defer p.Done()

	var stat restic.Stat

	for _, dir := range dirs {
		debug.Log("Start for %v", dir)
		err := fs.Walk(dir, func(str string, fi os.FileInfo, err error) error {
			// TODO: integrate error reporting
			if err != nil {
				fmt.Fprintf(os.Stderr, "error for %v: %v\n", str, err)
				return nil
			}
			if fi == nil {
				fmt.Fprintf(os.Stderr, "error for %v: FileInfo is nil\n", str)
				return nil
			}

			if !filter(str, fi) {
				debug.Log("path %v excluded", str)
				if fi.IsDir() {
					return filepath.SkipDir
				}
				return nil
			}

			s := restic.Stat{}
			if fi.IsDir() {
				s.Dirs++
			} else {
				s.Files++

				if isRegularFile(fi) {
					s.Bytes += uint64(fi.Size())
				}
			}

			p.Report(s)
			stat.Add(s)

			// TODO: handle error?
			return nil
		})

		debug.Log("Done for %v, err: %v", dir, err)
		if err != nil {
			return restic.Stat{}, errors.Wrap(err, "fs.Walk")
		}
	}

	return stat, nil
}

// ReadData loads all data from the repository and checks the integrity.
func (c *Checker) ReadData(p *restic.Progress, errChan chan<- error, done <-chan struct{}) {
	defer close(errChan)

	p.Start()
	defer p.Done()

	worker := func(wg *sync.WaitGroup, in <-chan backend.ID) {
		defer wg.Done()
		for {
			var id backend.ID
			var ok bool

			select {
			case <-done:
				return
			case id, ok = <-in:
				if !ok {
					return
				}
			}

			err := checkPack(c.repo, id)
			p.Report(restic.Stat{Blobs: 1})
			if err == nil {
				continue
			}

			select {
			case <-done:
				return
			case errChan <- err:
			}
		}
	}

	ch := c.repo.List(backend.Data, done)

	var wg sync.WaitGroup
	for i := 0; i < defaultParallelism; i++ {
		wg.Add(1)
		go worker(&wg, ch)
	}

	wg.Wait()
}

// New creates a new index for repo from scratch.
func New(repo restic.Repository, p *restic.Progress) (*Index, error) {
	done := make(chan struct{})
	defer close(done)

	p.Start()
	defer p.Done()

	ch := make(chan worker.Job)
	go list.AllPacks(repo, ch, done)

	idx := newIndex()

	for job := range ch {
		p.Report(restic.Stat{Blobs: 1})

		packID := job.Data.(restic.ID)
		if job.Error != nil {
			fmt.Fprintf(os.Stderr, "unable to list pack %v: %v\n", packID.Str(), job.Error)
			continue
		}

		j := job.Result.(list.Result)

		debug.Log("pack %v contains %d blobs", packID.Str(), len(j.Entries()))

		err := idx.AddPack(packID, j.Size(), j.Entries())
		if err != nil {
			return nil, err
		}

		p := Pack{Entries: j.Entries(), Size: j.Size()}
		idx.Packs[packID] = p
	}

	return idx, nil
}

// Load creates an index by loading all index files from the repo.
func Load(repo restic.Repository, p *restic.Progress) (*Index, error) {
	debug.Log("loading indexes")

	p.Start()
	defer p.Done()

	done := make(chan struct{})
	defer close(done)

	supersedes := make(map[restic.ID]restic.IDSet)
	results := make(map[restic.ID]map[restic.ID]Pack)

	index := newIndex()

	for id := range repo.List(restic.IndexFile, done) {
		p.Report(restic.Stat{Blobs: 1})

		debug.Log("Load index %v", id.Str())
		idx, err := loadIndexJSON(repo, id)
		if err != nil {
			return nil, err
		}

		res := make(map[restic.ID]Pack)
		supersedes[id] = restic.NewIDSet()
		for _, sid := range idx.Supersedes {
			debug.Log("  index %v supersedes %v", id.Str(), sid)
			supersedes[id].Insert(sid)
		}

		for _, jpack := range idx.Packs {
			entries := make([]restic.Blob, 0, len(jpack.Blobs))
			for _, blob := range jpack.Blobs {
				entry := restic.Blob{
					ID:     blob.ID,
					Type:   blob.Type,
					Offset: blob.Offset,
					Length: blob.Length,
				}
				entries = append(entries, entry)
			}

			if err = index.AddPack(jpack.ID, 0, entries); err != nil {
				return nil, err
			}
		}

		results[id] = res
		index.IndexIDs.Insert(id)
	}

	for superID, list := range supersedes {
		for indexID := range list {
			if _, ok := results[indexID]; !ok {
				continue
			}
			debug.Log("  removing index %v, superseded by %v", indexID.Str(), superID.Str())
			fmt.Fprintf(os.Stderr, "index %v can be removed, superseded by index %v\n", indexID.Str(), superID.Str())
			delete(results, indexID)
		}
	}

	return index, nil
}

// Snapshot creates a snapshot of the given paths. If parentrestic.ID is set, this is
// used to compare the files to the ones archived at the time this snapshot was
// taken.
func (arch *Archiver) Snapshot(p *restic.Progress, paths, tags []string, parentID *restic.ID) (*restic.Snapshot, restic.ID, error) {
	paths = unique(paths)
	sort.Sort(baseNameSlice(paths))

	debug.Log("start for %v", paths)

	debug.RunHook("Archiver.Snapshot", nil)

	// signal the whole pipeline to stop
	done := make(chan struct{})
	var err error

	p.Start()
	defer p.Done()

	// create new snapshot
	sn, err := restic.NewSnapshot(paths, tags)
	if err != nil {
		return nil, restic.ID{}, err
	}
	sn.Excludes = arch.Excludes

	jobs := archivePipe{}

	// use parent snapshot (if some was given)
	if parentID != nil {
		sn.Parent = parentID

		// load parent snapshot
		parent, err := restic.LoadSnapshot(arch.repo, *parentID)
		if err != nil {
			return nil, restic.ID{}, err
		}

		// start walker on old tree
		ch := make(chan walk.TreeJob)
		go walk.Tree(arch.repo, *parent.Tree, done, ch)
		jobs.Old = ch
	} else {
		// use closed channel
		ch := make(chan walk.TreeJob)
		close(ch)
		jobs.Old = ch
	}

	// start walker
	pipeCh := make(chan pipe.Job)
	resCh := make(chan pipe.Result, 1)
	go func() {
		pipe.Walk(paths, arch.SelectFilter, done, pipeCh, resCh)
		debug.Log("pipe.Walk done")
	}()
	jobs.New = pipeCh

	ch := make(chan pipe.Job)
	go jobs.compare(done, ch)

	var wg sync.WaitGroup
	entCh := make(chan pipe.Entry)
	dirCh := make(chan pipe.Dir)

	// split
	wg.Add(1)
	go func() {
		pipe.Split(ch, dirCh, entCh)
		debug.Log("split done")
		close(dirCh)
		close(entCh)
		wg.Done()
	}()

	// run workers
	for i := 0; i < maxConcurrency; i++ {
		wg.Add(2)
		go arch.fileWorker(&wg, p, done, entCh)
		go arch.dirWorker(&wg, p, done, dirCh)
	}

	// run index saver
	var wgIndexSaver sync.WaitGroup
	stopIndexSaver := make(chan struct{})
	wgIndexSaver.Add(1)
	go arch.saveIndexes(&wgIndexSaver, stopIndexSaver)

	// wait for all workers to terminate
	debug.Log("wait for workers")
	wg.Wait()

	// stop index saver
	close(stopIndexSaver)
	wgIndexSaver.Wait()

	debug.Log("workers terminated")

	// receive the top-level tree
	root := (<-resCh).(*restic.Node)
	debug.Log("root node received: %v", root.Subtree.Str())
//.........这里部分代码省略.........

// ArchiveReader reads from the reader and archives the data. Returned is the
// resulting snapshot and its ID.
func ArchiveReader(repo restic.Repository, p *restic.Progress, rd io.Reader, name string, tags []string) (*restic.Snapshot, restic.ID, error) {
	debug.Log("start archiving %s", name)
	sn, err := restic.NewSnapshot([]string{name}, tags)
	if err != nil {
		return nil, restic.ID{}, err
	}

	p.Start()
	defer p.Done()

	chnker := chunker.New(rd, repo.Config().ChunkerPolynomial)

	var ids restic.IDs
	var fileSize uint64

	for {
		chunk, err := chnker.Next(getBuf())
		if errors.Cause(err) == io.EOF {
			break
		}

		if err != nil {
			return nil, restic.ID{}, errors.Wrap(err, "chunker.Next()")
		}

		id := restic.Hash(chunk.Data)

		if !repo.Index().Has(id, restic.DataBlob) {
			_, err := repo.SaveBlob(restic.DataBlob, chunk.Data, id)
			if err != nil {
				return nil, restic.ID{}, err
			}
			debug.Log("saved blob %v (%d bytes)\n", id.Str(), chunk.Length)
		} else {
			debug.Log("blob %v already saved in the repo\n", id.Str())
		}

		freeBuf(chunk.Data)

		ids = append(ids, id)

		p.Report(restic.Stat{Bytes: uint64(chunk.Length)})
		fileSize += uint64(chunk.Length)
	}

	tree := &restic.Tree{
		Nodes: []*restic.Node{
			&restic.Node{
				Name:       name,
				AccessTime: time.Now(),
				ModTime:    time.Now(),
				Type:       "file",
				Mode:       0644,
				Size:       fileSize,
				UID:        sn.UID,
				GID:        sn.GID,
				User:       sn.Username,
				Content:    ids,
			},
		},
	}

	treeID, err := repo.SaveTree(tree)
	if err != nil {
		return nil, restic.ID{}, err
	}
	sn.Tree = &treeID
	debug.Log("tree saved as %v", treeID.Str())

	id, err := repo.SaveJSONUnpacked(restic.SnapshotFile, sn)
	if err != nil {
		return nil, restic.ID{}, err
	}

	debug.Log("snapshot saved as %v", id.Str())

	err = repo.Flush()
	if err != nil {
		return nil, restic.ID{}, err
	}

	err = repo.SaveIndex()
	if err != nil {
		return nil, restic.ID{}, err
	}

	return sn, id, nil
}