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package lfs
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"math/rand"
"testing"
"github.com/git-lfs/git-lfs/v3/git"
"github.com/git-lfs/gitobj/v2"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestPointerScannerWithValidOutput(t *testing.T) {
blobs := []*Pointer{
&Pointer{
Version: "https://git-lfs.github.com/spec/v1",
Oid: "e71eefd918ea175b8f362611f981f648dbf9888ff74865077cb4c9077728f350",
Size: 123,
OidType: "sha256",
},
&Pointer{
Version: "https://git-lfs.github.com/spec/v1",
Oid: "0eb69b651be65d5a61d6bebf2c53c811a5bf8031951111000e2077f4d7fe43b1",
Size: 132,
OidType: "sha256",
},
}
be, _ := gitobj.NewMemoryBackend(nil)
db, _ := gitobj.FromBackend(be)
shas := fakeObjectsWithRandoData(t, db, blobs)
scanner := &PointerScanner{
scanner: git.NewObjectScannerFrom(db),
}
iter := 0
for i := 0; i < 5; i++ {
assertNextEmptyPointer(t, scanner, shas[iter])
iter++
}
assertNextPointer(t, scanner, shas[iter], "e71eefd918ea175b8f362611f981f648dbf9888ff74865077cb4c9077728f350")
iter++
for i := 0; i < 5; i++ {
assertNextEmptyPointer(t, scanner, shas[iter])
iter++
}
assertNextPointer(t, scanner, shas[iter], "0eb69b651be65d5a61d6bebf2c53c811a5bf8031951111000e2077f4d7fe43b1")
iter++
for i := 0; i < 5; i++ {
assertNextEmptyPointer(t, scanner, shas[iter])
iter++
}
}
func TestPointerScannerWithLargeBlobs(t *testing.T) {
buf := bytes.NewBuffer(make([]byte, 0, 1025))
sha := sha256.New()
rng := rand.New(rand.NewSource(0))
_, err := io.CopyN(io.MultiWriter(sha, buf), rng, 1025)
require.Nil(t, err)
be, _ := gitobj.NewMemoryBackend(nil)
db, _ := gitobj.FromBackend(be)
fake := bytes.NewBuffer(nil)
oid := writeFakeBuffer(t, db, fake, buf.Bytes(), buf.Len())
scanner := &PointerScanner{
scanner: git.NewObjectScannerFrom(db),
}
require.True(t, scanner.Scan(oid))
assert.Nil(t, scanner.Pointer())
assert.Equal(t, fmt.Sprintf("%x", sha.Sum(nil)), scanner.ContentsSha())
}
func assertNextPointer(t *testing.T, scanner *PointerScanner, sha string, oid string) {
assert.True(t, scanner.Scan(sha))
assert.Nil(t, scanner.Err())
p := scanner.Pointer()
assert.NotNil(t, p)
assert.Equal(t, oid, p.Oid)
}
func assertNextEmptyPointer(t *testing.T, scanner *PointerScanner, sha string) {
assert.True(t, scanner.Scan(sha))
assert.Nil(t, scanner.Err())
assert.Nil(t, scanner.Pointer())
}
func fakeObjectsWithRandoData(t *testing.T, db *gitobj.ObjectDatabase, blobs []*Pointer) []string {
buf := &bytes.Buffer{}
rngbuf := make([]byte, 1000) // just under blob size cutoff
rng := rand.New(rand.NewSource(0))
oids := make([]string, 0)
for i := 0; i < 5; i++ {
n, err := io.ReadFull(rng, rngbuf)
if err != nil {
t.Fatalf("error reading from rng: %+v", err)
}
oids = append(oids, writeFakeBuffer(t, db, buf, rngbuf, n))
}
for _, b := range blobs {
ptrtext := b.Encoded()
oids = append(oids, writeFakeBuffer(t, db, buf, []byte(ptrtext), len(ptrtext)))
for i := 0; i < 5; i++ {
n, err := io.ReadFull(rng, rngbuf)
if err != nil {
t.Fatalf("error reading from rng: %+v", err)
}
oids = append(oids, writeFakeBuffer(t, db, buf, rngbuf, n))
}
}
return oids
}
func writeFakeBuffer(t *testing.T, db *gitobj.ObjectDatabase, buf *bytes.Buffer, by []byte, size int) string {
oid, _ := db.WriteBlob(gitobj.NewBlobFromBytes(by))
return hex.EncodeToString(oid)
}
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