Beispiel #1
0
// findPacker returns a packer for a new blob of size bytes. Either a new one is
// created or one is returned that already has some blobs.
func (r *packerManager) findPacker(size uint) (*pack.Packer, error) {
	r.pm.Lock()
	defer r.pm.Unlock()

	// search for a suitable packer
	if len(r.packs) > 0 {
		debug.Log("Repo.findPacker", "searching packer for %d bytes\n", size)
		for i, p := range r.packs {
			if p.Size()+size < maxPackSize {
				debug.Log("Repo.findPacker", "found packer %v", p)
				// remove from list
				r.packs = append(r.packs[:i], r.packs[i+1:]...)
				return p, nil
			}
		}
	}

	// no suitable packer found, return new
	blob, err := r.be.Create()
	if err != nil {
		return nil, err
	}
	debug.Log("Repo.findPacker", "create new pack %p for %d bytes", blob, size)
	return pack.NewPacker(r.key, blob), nil
}
Beispiel #2
0
func TestCreatePack(t *testing.T) {
	type Buf struct {
		data []byte
		id   backend.ID
	}

	bufs := []Buf{}

	for _, l := range lengths {
		b := make([]byte, l)
		_, err := io.ReadFull(rand.Reader, b)
		OK(t, err)
		h := sha256.Sum256(b)
		bufs = append(bufs, Buf{data: b, id: h})
	}

	file := bytes.NewBuffer(nil)

	// create random keys
	k := crypto.NewRandomKey()

	// pack blobs
	p := pack.NewPacker(k, file)
	for _, b := range bufs {
		p.Add(pack.Tree, b.id, bytes.NewReader(b.data))
	}

	// write file
	n, err := p.Finalize()
	OK(t, err)

	written := 0
	// data
	for _, l := range lengths {
		written += l
	}
	// header length
	written += binary.Size(uint32(0))
	// header
	written += len(lengths) * (binary.Size(pack.BlobType(0)) + binary.Size(uint32(0)) + backend.IDSize)
	// header crypto
	written += crypto.Extension

	// check length
	Equals(t, uint(written), n)
	Equals(t, uint(written), p.Size())

	// read and parse it again
	rd := bytes.NewReader(file.Bytes())
	np, err := pack.NewUnpacker(k, nil, rd)
	OK(t, err)
	Equals(t, len(np.Entries), len(bufs))

	for i, b := range bufs {
		e := np.Entries[i]
		Equals(t, b.id, e.ID)

		brd, err := e.GetReader(rd)
		OK(t, err)
		data, err := ioutil.ReadAll(brd)
		OK(t, err)

		Assert(t, bytes.Equal(b.data, data),
			"data for blob %v doesn't match", i)
	}
}