Golang Progress.Report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
}

func (arch *Archiver) saveChunk(chunk chunker.Chunk, p *restic.Progress, token struct{}, file fs.File, resultChannel chan<- saveResult) {
	defer freeBuf(chunk.Data)

	id := restic.Hash(chunk.Data)
	err := arch.Save(restic.DataBlob, chunk.Data, id)
	// TODO handle error
	if err != nil {
		panic(err)
	}

	p.Report(restic.Stat{Bytes: uint64(chunk.Length)})
	arch.blobToken <- token
	resultChannel <- saveResult{id: id, bytes: uint64(chunk.Length)}
}

// 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
}

func (arch *Archiver) dirWorker(wg *sync.WaitGroup, p *restic.Progress, done <-chan struct{}, dirCh <-chan pipe.Dir) {
	debug.Log("start")
	defer func() {
		debug.Log("done")
		wg.Done()
	}()
	for {
		select {
		case dir, ok := <-dirCh:
			if !ok {
				// channel is closed
				return
			}
			debug.Log("save dir %v (%d entries), error %v\n", dir.Path(), len(dir.Entries), dir.Error())

			// ignore dir nodes with errors
			if dir.Error() != nil {
				fmt.Fprintf(os.Stderr, "error walking dir %v: %v\n", dir.Path(), dir.Error())
				dir.Result() <- nil
				p.Report(restic.Stat{Errors: 1})
				continue
			}

			tree := restic.NewTree()

			// wait for all content
			for _, ch := range dir.Entries {
				debug.Log("receiving result from %v", ch)
				res := <-ch

				// if we get a nil pointer here, an error has happened while
				// processing this entry. Ignore it for now.
				if res == nil {
					debug.Log("got nil result?")
					continue
				}

				// else insert node
				node := res.(*restic.Node)
				tree.Insert(node)

				if node.Type == "dir" {
					debug.Log("got tree node for %s: %v", node.Path, node.Subtree)

					if node.Subtree.IsNull() {
						panic("invalid null subtree restic.ID")
					}
				}
			}

			node := &restic.Node{}

			if dir.Path() != "" && dir.Info() != nil {
				n, err := restic.NodeFromFileInfo(dir.Path(), dir.Info())
				if err != nil {
					n.Error = err.Error()
					dir.Result() <- n
					continue
				}
				node = n
			}

			if err := dir.Error(); err != nil {
				node.Error = err.Error()
			}

			id, err := arch.SaveTreeJSON(tree)
			if err != nil {
				panic(err)
			}
			debug.Log("save tree for %s: %v", dir.Path(), id.Str())
			if id.IsNull() {
				panic("invalid null subtree restic.ID return from SaveTreeJSON()")
			}

			node.Subtree = &id

			debug.Log("sending result to %v", dir.Result())

			dir.Result() <- node
			if dir.Path() != "" {
				p.Report(restic.Stat{Dirs: 1})
			}
		case <-done:
			// pipeline was cancelled
			return
		}
	}
}

func (arch *Archiver) fileWorker(wg *sync.WaitGroup, p *restic.Progress, done <-chan struct{}, entCh <-chan pipe.Entry) {
	defer func() {
		debug.Log("done")
		wg.Done()
	}()
	for {
		select {
		case e, ok := <-entCh:
			if !ok {
				// channel is closed
				return
			}

			debug.Log("got job %v", e)

			// check for errors
			if e.Error() != nil {
				debug.Log("job %v has errors: %v", e.Path(), e.Error())
				// TODO: integrate error reporting
				fmt.Fprintf(os.Stderr, "error for %v: %v\n", e.Path(), e.Error())
				// ignore this file
				e.Result() <- nil
				p.Report(restic.Stat{Errors: 1})
				continue
			}

			node, err := restic.NodeFromFileInfo(e.Fullpath(), e.Info())
			if err != nil {
				// TODO: integrate error reporting
				debug.Log("restic.NodeFromFileInfo returned error for %v: %v", node.Path, err)
				e.Result() <- nil
				p.Report(restic.Stat{Errors: 1})
				continue
			}

			// try to use old node, if present
			if e.Node != nil {
				debug.Log("   %v use old data", e.Path())

				oldNode := e.Node.(*restic.Node)
				// check if all content is still available in the repository
				contentMissing := false
				for _, blob := range oldNode.Content {
					if !arch.repo.Index().Has(blob, restic.DataBlob) {
						debug.Log("   %v not using old data, %v is missing", e.Path(), blob.Str())
						contentMissing = true
						break
					}
				}

				if !contentMissing {
					node.Content = oldNode.Content
					debug.Log("   %v content is complete", e.Path())
				}
			} else {
				debug.Log("   %v no old data", e.Path())
			}

			// otherwise read file normally
			if node.Type == "file" && len(node.Content) == 0 {
				debug.Log("   read and save %v, content: %v", e.Path(), node.Content)
				err = arch.SaveFile(p, node)
				if err != nil {
					// TODO: integrate error reporting
					fmt.Fprintf(os.Stderr, "error for %v: %v\n", node.Path, err)
					// ignore this file
					e.Result() <- nil
					p.Report(restic.Stat{Errors: 1})
					continue
				}
			} else {
				// report old data size
				p.Report(restic.Stat{Bytes: node.Size})
			}

			debug.Log("   processed %v, %d blobs", e.Path(), len(node.Content))
			e.Result() <- node
			p.Report(restic.Stat{Files: 1})
		case <-done:
			// pipeline was cancelled
			return
		}
	}
}

// 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
}