restic/internal/pack/pack_test.go

146 lines
3.4 KiB
Go

package pack_test
import (
"bytes"
"context"
"crypto/rand"
"crypto/sha256"
"encoding/json"
"io"
"testing"
"github.com/restic/restic/internal/backend/mem"
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/pack"
"github.com/restic/restic/internal/restic"
rtest "github.com/restic/restic/internal/test"
)
var testLens = []int{23, 31650, 25860, 10928, 13769, 19862, 5211, 127, 13690, 30231}
type Buf struct {
data []byte
id restic.ID
}
func newPack(t testing.TB, k *crypto.Key, lengths []int) ([]Buf, []byte, uint) {
bufs := []Buf{}
for _, l := range lengths {
b := make([]byte, l)
_, err := io.ReadFull(rand.Reader, b)
rtest.OK(t, err)
h := sha256.Sum256(b)
bufs = append(bufs, Buf{data: b, id: h})
}
// pack blobs
var buf bytes.Buffer
p := pack.NewPacker(k, &buf)
for _, b := range bufs {
_, err := p.Add(restic.TreeBlob, b.id, b.data, 2*len(b.data))
rtest.OK(t, err)
}
err := p.Finalize()
rtest.OK(t, err)
return bufs, buf.Bytes(), p.Size()
}
func verifyBlobs(t testing.TB, bufs []Buf, k *crypto.Key, rd io.ReaderAt, packSize uint) {
written := 0
for _, buf := range bufs {
written += len(buf.data)
}
// read and parse it again
entries, hdrSize, err := pack.List(k, rd, int64(packSize))
rtest.OK(t, err)
rtest.Equals(t, len(entries), len(bufs))
// check the head size calculation for consistency
headerSize := pack.CalculateHeaderSize(entries)
written += headerSize
// check length
rtest.Equals(t, uint(written), packSize)
rtest.Equals(t, headerSize, int(hdrSize))
var buf []byte
for i, b := range bufs {
e := entries[i]
rtest.Equals(t, b.id, e.ID)
if len(buf) < int(e.Length) {
buf = make([]byte, int(e.Length))
}
buf = buf[:int(e.Length)]
n, err := rd.ReadAt(buf, int64(e.Offset))
rtest.OK(t, err)
buf = buf[:n]
rtest.Assert(t, bytes.Equal(b.data, buf),
"data for blob %v doesn't match", i)
}
}
func TestCreatePack(t *testing.T) {
// create random keys
k := crypto.NewRandomKey()
bufs, packData, packSize := newPack(t, k, testLens)
rtest.Equals(t, uint(len(packData)), packSize)
verifyBlobs(t, bufs, k, bytes.NewReader(packData), packSize)
}
var blobTypeJSON = []struct {
t restic.BlobType
res string
}{
{restic.DataBlob, `"data"`},
{restic.TreeBlob, `"tree"`},
}
func TestBlobTypeJSON(t *testing.T) {
for _, test := range blobTypeJSON {
// test serialize
buf, err := json.Marshal(test.t)
rtest.OK(t, err)
rtest.Equals(t, test.res, string(buf))
// test unserialize
var v restic.BlobType
err = json.Unmarshal([]byte(test.res), &v)
rtest.OK(t, err)
rtest.Equals(t, test.t, v)
}
}
func TestUnpackReadSeeker(t *testing.T) {
// create random keys
k := crypto.NewRandomKey()
bufs, packData, packSize := newPack(t, k, testLens)
b := mem.New()
id := restic.Hash(packData)
handle := restic.Handle{Type: restic.PackFile, Name: id.String()}
rtest.OK(t, b.Save(context.TODO(), handle, restic.NewByteReader(packData, b.Hasher())))
verifyBlobs(t, bufs, k, restic.ReaderAt(context.TODO(), b, handle), packSize)
}
func TestShortPack(t *testing.T) {
k := crypto.NewRandomKey()
bufs, packData, packSize := newPack(t, k, []int{23})
b := mem.New()
id := restic.Hash(packData)
handle := restic.Handle{Type: restic.PackFile, Name: id.String()}
rtest.OK(t, b.Save(context.TODO(), handle, restic.NewByteReader(packData, b.Hasher())))
verifyBlobs(t, bufs, k, restic.ReaderAt(context.TODO(), b, handle), packSize)
}