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datastore-vlog.go
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datastore-vlog.go
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package main
import (
"bufio"
"encoding/binary"
"errors"
"fmt"
"hash"
"hash/crc32"
"io"
"os"
"strings"
"github.com/dgraph-io/badger/v2/y"
block "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/mitchellh/go-homedir"
"github.com/multiformats/go-base32"
"github.com/urfave/cli/v2"
"golang.org/x/xerrors"
)
var datastoreVlog2CarCmd = &cli.Command{
Name: "vlog2car",
Usage: "convert badger blockstore .vlog to .car",
Flags: []cli.Flag{
&cli.PathFlag{
Name: "car",
Usage: "out car file name (no .car)",
Required: true,
},
&cli.StringFlag{
Name: "key-prefix",
Usage: "datastore prefix",
Value: "/blocks/",
},
&cli.Uint64Flag{
Name: "max-size",
Value: 32000,
Usage: "max single car size in MiB",
},
},
ArgsUsage: "[vlog...]",
Action: func(cctx *cli.Context) error {
ctx := cctx.Context
maxSz := cctx.Uint64("max-size") << 20
carb := &rawCarb{
max: maxSz,
blocks: map[cid.Cid]block.Block{},
}
cars := 0
pref := cctx.String("key-prefix")
plen := len(pref)
for _, vlogPath := range cctx.Args().Slice() {
vlogPath, err := homedir.Expand(vlogPath)
if err != nil {
return xerrors.Errorf("expand vlog path: %w", err)
}
// NOTE: Some bits of code in this code block come from https://github.com/dgraph-io/badger, which is licensed
// under Apache 2.0; See https://github.com/dgraph-io/badger/blob/master/LICENSE
vf, err := os.Open(vlogPath)
if err != nil {
return xerrors.Errorf("open vlog file: %w", err)
}
if _, err := vf.Seek(20, io.SeekStart); err != nil {
return xerrors.Errorf("seek past vlog start: %w", err)
}
reader := bufio.NewReader(vf)
read := &safeRead{
k: make([]byte, 10),
v: make([]byte, 10),
recordOffset: 20,
}
loop:
for {
e, err := read.Entry(reader)
switch {
case err == io.EOF:
break loop
case err == io.ErrUnexpectedEOF || err == errTruncate:
break loop
case err != nil:
return xerrors.Errorf("entry read error: %w", err)
case e == nil:
continue
}
if e.meta&0x40 > 0 {
e.Key = e.Key[:len(e.Key)-8]
} else if e.meta > 0 {
if e.meta&0x3f > 0 {
log.Infof("unk meta m:%x; k:%x, v:%60x", e.meta, e.Key, e.Value)
}
continue
}
{
if plen > 0 && !strings.HasPrefix(string(e.Key), pref) {
log.Infow("no blocks prefix", "key", string(e.Key))
continue
}
h, err := base32.RawStdEncoding.DecodeString(string(e.Key[plen:]))
if err != nil {
return xerrors.Errorf("decode b32 ds key %x: %w", e.Key, err)
}
c := cid.NewCidV1(cid.Raw, h)
b, err := block.NewBlockWithCid(e.Value, c)
if err != nil {
return xerrors.Errorf("readblk: %w", err)
}
err = carb.consume(c, b)
switch err {
case nil:
case errFullCar:
root, err := carb.finalize()
if err != nil {
return xerrors.Errorf("carb finalize: %w", err)
}
if err := carb.writeCar(ctx, fmt.Sprintf("%s%d.car", cctx.Path("car"), cars), root); err != nil {
return xerrors.Errorf("writeCar: %w", err)
}
cars++
carb = &rawCarb{
max: maxSz,
blocks: map[cid.Cid]block.Block{},
}
default:
return xerrors.Errorf("carb consume: %w", err)
}
}
}
if err := vf.Close(); err != nil {
return err
}
}
root, err := carb.finalize()
if err != nil {
return xerrors.Errorf("carb finalize: %w", err)
}
if err := carb.writeCar(ctx, fmt.Sprintf("%s%d.car", cctx.Path("car"), cars), root); err != nil {
return xerrors.Errorf("writeCar: %w", err)
}
return nil
},
}
// NOTE: Code below comes (with slight modifications) from https://github.com/dgraph-io/badger/blob/master/value.go
// Apache 2.0; See https://github.com/dgraph-io/badger/blob/master/LICENSE
var errTruncate = errors.New("do truncate")
// hashReader implements io.Reader, io.ByteReader interfaces. It also keeps track of the number
// bytes read. The hashReader writes to h (hash) what it reads from r.
type hashReader struct {
r io.Reader
h hash.Hash32
bytesRead int // Number of bytes read.
}
func newHashReader(r io.Reader) *hashReader {
hash := crc32.New(y.CastagnoliCrcTable)
return &hashReader{
r: r,
h: hash,
}
}
// Read reads len(p) bytes from the reader. Returns the number of bytes read, error on failure.
func (t *hashReader) Read(p []byte) (int, error) {
n, err := t.r.Read(p)
if err != nil {
return n, err
}
t.bytesRead += n
return t.h.Write(p[:n])
}
// ReadByte reads exactly one byte from the reader. Returns error on failure.
func (t *hashReader) ReadByte() (byte, error) {
b := make([]byte, 1)
_, err := t.Read(b)
return b[0], err
}
// Sum32 returns the sum32 of the underlying hash.
func (t *hashReader) Sum32() uint32 {
return t.h.Sum32()
}
type safeRead struct {
k []byte
v []byte
recordOffset uint32
}
// Entry provides Key, Value, UserMeta and ExpiresAt. This struct can be used by
// the user to set data.
type Entry struct {
Key []byte
Value []byte
UserMeta byte
ExpiresAt uint64 // time.Unix
meta byte
// Fields maintained internally.
offset uint32
hlen int // Length of the header.
}
// Entry reads an entry from the provided reader. It also validates the checksum for every entry
// read. Returns error on failure.
func (r *safeRead) Entry(reader io.Reader) (*Entry, error) {
tee := newHashReader(reader)
var h header
hlen, err := h.DecodeFrom(tee)
if err != nil {
return nil, err
}
if h.klen > uint32(1<<16) { // Key length must be below uint16.
return nil, errTruncate
}
kl := int(h.klen)
if cap(r.k) < kl {
r.k = make([]byte, 2*kl)
}
vl := int(h.vlen)
if cap(r.v) < vl {
r.v = make([]byte, 2*vl)
}
e := &Entry{}
e.offset = r.recordOffset
e.hlen = hlen
buf := make([]byte, h.klen+h.vlen)
if _, err := io.ReadFull(tee, buf[:]); err != nil {
if err == io.EOF {
err = errTruncate
}
return nil, err
}
e.Key = buf[:h.klen]
e.Value = buf[h.klen:]
var crcBuf [crc32.Size]byte
if _, err := io.ReadFull(reader, crcBuf[:]); err != nil {
if err == io.EOF {
err = errTruncate
}
return nil, err
}
crc := y.BytesToU32(crcBuf[:])
if crc != tee.Sum32() {
return nil, errTruncate
}
e.meta = h.meta
e.UserMeta = h.userMeta
e.ExpiresAt = h.expiresAt
return e, nil
}
// header is used in value log as a header before Entry.
type header struct {
klen uint32
vlen uint32
expiresAt uint64
meta byte
userMeta byte
}
// Encode encodes the header into []byte. The provided []byte should be atleast 5 bytes. The
// function will panic if out []byte isn't large enough to hold all the values.
// The encoded header looks like
// +------+----------+------------+--------------+-----------+
// | Meta | UserMeta | Key Length | Value Length | ExpiresAt |
// +------+----------+------------+--------------+-----------+
func (h header) Encode(out []byte) int {
out[0], out[1] = h.meta, h.userMeta
index := 2
index += binary.PutUvarint(out[index:], uint64(h.klen))
index += binary.PutUvarint(out[index:], uint64(h.vlen))
index += binary.PutUvarint(out[index:], h.expiresAt)
return index
}
// Decode decodes the given header from the provided byte slice.
// Returns the number of bytes read.
func (h *header) Decode(buf []byte) int {
h.meta, h.userMeta = buf[0], buf[1]
index := 2
klen, count := binary.Uvarint(buf[index:])
h.klen = uint32(klen)
index += count
vlen, count := binary.Uvarint(buf[index:])
h.vlen = uint32(vlen)
index += count
h.expiresAt, count = binary.Uvarint(buf[index:])
return index + count
}
// DecodeFrom reads the header from the hashReader.
// Returns the number of bytes read.
func (h *header) DecodeFrom(reader *hashReader) (int, error) {
var err error
h.meta, err = reader.ReadByte()
if err != nil {
return 0, err
}
h.userMeta, err = reader.ReadByte()
if err != nil {
return 0, err
}
klen, err := binary.ReadUvarint(reader)
if err != nil {
return 0, err
}
h.klen = uint32(klen)
vlen, err := binary.ReadUvarint(reader)
if err != nil {
return 0, err
}
h.vlen = uint32(vlen)
h.expiresAt, err = binary.ReadUvarint(reader)
if err != nil {
return 0, err
}
return reader.bytesRead, nil
}