mirror of
https://github.com/restic/restic.git
synced 2024-08-19 10:53:23 +02:00
252 lines
5.5 KiB
Go
252 lines
5.5 KiB
Go
package archiver
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import (
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"context"
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"io"
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"os"
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"github.com/restic/chunker"
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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/fs"
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"github.com/restic/restic/internal/restic"
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tomb "gopkg.in/tomb.v2"
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)
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// FutureFile is returned by Save and will return the data once it
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// has been processed.
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type FutureFile struct {
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ch <-chan saveFileResponse
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res saveFileResponse
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}
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// Wait blocks until the result of the save operation is received or ctx is
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// cancelled.
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func (s *FutureFile) Wait(ctx context.Context) {
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select {
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case res, ok := <-s.ch:
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if ok {
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s.res = res
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}
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case <-ctx.Done():
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return
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}
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}
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// Node returns the node once it is available.
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func (s *FutureFile) Node() *restic.Node {
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return s.res.node
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}
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// Stats returns the stats for the file once they are available.
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func (s *FutureFile) Stats() ItemStats {
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return s.res.stats
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}
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// Err returns the error in case an error occurred.
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func (s *FutureFile) Err() error {
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return s.res.err
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}
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// SaveBlobFn saves a blob to a repo.
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type SaveBlobFn func(context.Context, restic.BlobType, *Buffer) FutureBlob
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// FileSaver concurrently saves incoming files to the repo.
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type FileSaver struct {
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fs fs.FS
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saveFilePool *BufferPool
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saveBlob SaveBlobFn
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pol chunker.Pol
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ch chan<- saveFileJob
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done <-chan struct{}
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CompleteBlob func(filename string, bytes uint64)
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NodeFromFileInfo func(filename string, fi os.FileInfo) (*restic.Node, error)
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}
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// NewFileSaver returns a new file saver. A worker pool with fileWorkers is
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// started, it is stopped when ctx is cancelled.
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func NewFileSaver(ctx context.Context, t *tomb.Tomb, fs fs.FS, save SaveBlobFn, pol chunker.Pol, fileWorkers, blobWorkers uint) *FileSaver {
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ch := make(chan saveFileJob)
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debug.Log("new file saver with %v file workers and %v blob workers", fileWorkers, blobWorkers)
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poolSize := fileWorkers + blobWorkers
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s := &FileSaver{
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fs: fs,
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saveBlob: save,
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saveFilePool: NewBufferPool(ctx, int(poolSize), chunker.MaxSize),
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pol: pol,
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ch: ch,
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done: t.Dying(),
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CompleteBlob: func(string, uint64) {},
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}
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for i := uint(0); i < fileWorkers; i++ {
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t.Go(func() error {
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s.worker(t.Context(ctx), ch)
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return nil
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})
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}
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return s
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}
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// CompleteFunc is called when the file has been saved.
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type CompleteFunc func(*restic.Node, ItemStats)
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// Save stores the file f and returns the data once it has been completed. The
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// file is closed by Save.
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func (s *FileSaver) Save(ctx context.Context, snPath string, file fs.File, fi os.FileInfo, start func(), complete CompleteFunc) FutureFile {
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ch := make(chan saveFileResponse, 1)
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job := saveFileJob{
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snPath: snPath,
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file: file,
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fi: fi,
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start: start,
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complete: complete,
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ch: ch,
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}
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select {
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case s.ch <- job:
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case <-s.done:
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debug.Log("not sending job, FileSaver is done")
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_ = file.Close()
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close(ch)
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return FutureFile{ch: ch}
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case <-ctx.Done():
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debug.Log("not sending job, context is cancelled: %v", ctx.Err())
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_ = file.Close()
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close(ch)
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return FutureFile{ch: ch}
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}
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return FutureFile{ch: ch}
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}
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type saveFileJob struct {
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snPath string
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file fs.File
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fi os.FileInfo
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ch chan<- saveFileResponse
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complete CompleteFunc
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start func()
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}
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type saveFileResponse struct {
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node *restic.Node
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stats ItemStats
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err error
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}
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// saveFile stores the file f in the repo, then closes it.
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func (s *FileSaver) saveFile(ctx context.Context, chnker *chunker.Chunker, snPath string, f fs.File, fi os.FileInfo, start func()) saveFileResponse {
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start()
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stats := ItemStats{}
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debug.Log("%v", snPath)
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node, err := s.NodeFromFileInfo(f.Name(), fi)
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if err != nil {
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_ = f.Close()
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return saveFileResponse{err: err}
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}
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if node.Type != "file" {
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_ = f.Close()
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return saveFileResponse{err: errors.Errorf("node type %q is wrong", node.Type)}
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}
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// reuse the chunker
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chnker.Reset(f, s.pol)
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var results []FutureBlob
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node.Content = []restic.ID{}
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var size uint64
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for {
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buf := s.saveFilePool.Get()
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chunk, err := chnker.Next(buf.Data)
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if errors.Cause(err) == io.EOF {
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buf.Release()
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break
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}
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buf.Data = chunk.Data
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size += uint64(chunk.Length)
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if err != nil {
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_ = f.Close()
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return saveFileResponse{err: err}
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}
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// test if the context has been cancelled, return the error
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if ctx.Err() != nil {
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_ = f.Close()
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return saveFileResponse{err: ctx.Err()}
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}
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res := s.saveBlob(ctx, restic.DataBlob, buf)
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results = append(results, res)
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// test if the context has been cancelled, return the error
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if ctx.Err() != nil {
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_ = f.Close()
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return saveFileResponse{err: ctx.Err()}
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}
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s.CompleteBlob(f.Name(), uint64(len(chunk.Data)))
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}
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err = f.Close()
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if err != nil {
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return saveFileResponse{err: err}
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}
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for _, res := range results {
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res.Wait(ctx)
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if !res.Known() {
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stats.DataBlobs++
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stats.DataSize += uint64(res.Length())
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}
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node.Content = append(node.Content, res.ID())
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}
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node.Size = size
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return saveFileResponse{
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node: node,
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stats: stats,
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}
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}
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func (s *FileSaver) worker(ctx context.Context, jobs <-chan saveFileJob) {
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// a worker has one chunker which is reused for each file (because it contains a rather large buffer)
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chnker := chunker.New(nil, s.pol)
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for {
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var job saveFileJob
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select {
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case <-ctx.Done():
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return
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case job = <-jobs:
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}
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res := s.saveFile(ctx, chnker, job.snPath, job.file, job.fi, job.start)
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if job.complete != nil {
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job.complete(res.node, res.stats)
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}
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job.ch <- res
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close(job.ch)
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}
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}
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