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