forked from TrueCloudLab/restic
105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package archiver
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import (
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"context"
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"fmt"
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"github.com/restic/restic/internal/debug"
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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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// saver allows saving a blob.
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type saver interface {
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SaveBlob(ctx context.Context, t restic.BlobType, data []byte, id restic.ID, storeDuplicate bool) (restic.ID, bool, int, error)
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}
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// blobSaver concurrently saves incoming blobs to the repo.
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type blobSaver struct {
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repo saver
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ch chan<- saveBlobJob
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}
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// newBlobSaver returns a new blob. A worker pool is started, it is stopped
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// when ctx is cancelled.
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func newBlobSaver(ctx context.Context, wg *errgroup.Group, repo saver, workers uint) *blobSaver {
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ch := make(chan saveBlobJob)
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s := &blobSaver{
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repo: repo,
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ch: ch,
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}
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for i := uint(0); i < workers; i++ {
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wg.Go(func() error {
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return s.worker(ctx, ch)
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})
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}
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return s
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}
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func (s *blobSaver) TriggerShutdown() {
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close(s.ch)
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}
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// Save stores a blob in the repo. It checks the index and the known blobs
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// before saving anything. It takes ownership of the buffer passed in.
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func (s *blobSaver) Save(ctx context.Context, t restic.BlobType, buf *buffer, filename string, cb func(res saveBlobResponse)) {
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select {
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case s.ch <- saveBlobJob{BlobType: t, buf: buf, fn: filename, cb: cb}:
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case <-ctx.Done():
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debug.Log("not sending job, context is cancelled")
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}
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}
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type saveBlobJob struct {
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restic.BlobType
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buf *buffer
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fn string
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cb func(res saveBlobResponse)
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}
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type saveBlobResponse struct {
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id restic.ID
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length int
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sizeInRepo int
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known bool
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}
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func (s *blobSaver) saveBlob(ctx context.Context, t restic.BlobType, buf []byte) (saveBlobResponse, error) {
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id, known, sizeInRepo, err := s.repo.SaveBlob(ctx, t, buf, restic.ID{}, false)
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if err != nil {
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return saveBlobResponse{}, err
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}
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return saveBlobResponse{
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id: id,
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length: len(buf),
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sizeInRepo: sizeInRepo,
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known: known,
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}, nil
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}
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func (s *blobSaver) worker(ctx context.Context, jobs <-chan saveBlobJob) error {
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for {
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var job saveBlobJob
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var ok bool
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select {
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case <-ctx.Done():
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return nil
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case job, ok = <-jobs:
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if !ok {
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return nil
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}
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}
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res, err := s.saveBlob(ctx, job.BlobType, job.buf.Data)
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if err != nil {
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debug.Log("saveBlob returned error, exiting: %v", err)
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return fmt.Errorf("failed to save blob from file %q: %w", job.fn, err)
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}
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job.cb(res)
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job.buf.Release()
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}
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}
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