mirror of https://github.com/octoleo/restic.git
134 lines
2.9 KiB
Go
134 lines
2.9 KiB
Go
package archiver
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/restic/restic/internal/debug"
|
|
"github.com/restic/restic/internal/restic"
|
|
tomb "gopkg.in/tomb.v2"
|
|
)
|
|
|
|
// 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, error)
|
|
Index() restic.MasterIndex
|
|
}
|
|
|
|
// 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, t *tomb.Tomb, repo Saver, workers uint) *BlobSaver {
|
|
ch := make(chan saveBlobJob)
|
|
s := &BlobSaver{
|
|
repo: repo,
|
|
ch: ch,
|
|
}
|
|
|
|
for i := uint(0); i < workers; i++ {
|
|
t.Go(func() error {
|
|
return s.worker(t.Context(ctx), ch)
|
|
})
|
|
}
|
|
|
|
return s
|
|
}
|
|
|
|
// 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) FutureBlob {
|
|
ch := make(chan saveBlobResponse, 1)
|
|
select {
|
|
case s.ch <- saveBlobJob{BlobType: t, buf: buf, ch: ch}:
|
|
case <-ctx.Done():
|
|
debug.Log("not sending job, context is cancelled")
|
|
close(ch)
|
|
return FutureBlob{ch: ch}
|
|
}
|
|
|
|
return FutureBlob{ch: ch, length: len(buf.Data)}
|
|
}
|
|
|
|
// FutureBlob is returned by SaveBlob and will return the data once it has been processed.
|
|
type FutureBlob struct {
|
|
ch <-chan saveBlobResponse
|
|
length int
|
|
res saveBlobResponse
|
|
}
|
|
|
|
// Wait blocks until the result is available or the context is cancelled.
|
|
func (s *FutureBlob) Wait(ctx context.Context) {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
case res, ok := <-s.ch:
|
|
if ok {
|
|
s.res = res
|
|
}
|
|
}
|
|
}
|
|
|
|
// ID returns the ID of the blob after it has been saved.
|
|
func (s *FutureBlob) ID() restic.ID {
|
|
return s.res.id
|
|
}
|
|
|
|
// Known returns whether or not the blob was already known.
|
|
func (s *FutureBlob) Known() bool {
|
|
return s.res.known
|
|
}
|
|
|
|
// Length returns the length of the blob.
|
|
func (s *FutureBlob) Length() int {
|
|
return s.length
|
|
}
|
|
|
|
type saveBlobJob struct {
|
|
restic.BlobType
|
|
buf *Buffer
|
|
ch chan<- saveBlobResponse
|
|
}
|
|
|
|
type saveBlobResponse struct {
|
|
id restic.ID
|
|
known bool
|
|
}
|
|
|
|
func (s *BlobSaver) saveBlob(ctx context.Context, t restic.BlobType, buf []byte) (saveBlobResponse, error) {
|
|
id, known, err := s.repo.SaveBlob(ctx, t, buf, restic.ID{}, false)
|
|
|
|
if err != nil {
|
|
return saveBlobResponse{}, err
|
|
}
|
|
|
|
return saveBlobResponse{
|
|
id: id,
|
|
known: known,
|
|
}, nil
|
|
}
|
|
|
|
func (s *BlobSaver) worker(ctx context.Context, jobs <-chan saveBlobJob) error {
|
|
for {
|
|
var job saveBlobJob
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil
|
|
case job = <-jobs:
|
|
}
|
|
|
|
res, err := s.saveBlob(ctx, job.BlobType, job.buf.Data)
|
|
if err != nil {
|
|
debug.Log("saveBlob returned error, exiting: %v", err)
|
|
close(job.ch)
|
|
return err
|
|
}
|
|
job.ch <- res
|
|
close(job.ch)
|
|
job.buf.Release()
|
|
}
|
|
}
|