/
snapread.go
180 lines (154 loc) · 3.36 KB
/
snapread.go
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package snapio
import (
"bufio"
"encoding/binary"
"errors"
"fmt"
"io"
"github.com/klauspost/compress/zstd"
"github.com/tinylib/msgp/msgp"
"github.com/viciious/go-tarantool"
)
func ReadSnapshotPacked(rs io.Reader, tuplecb func(space uint, tuple []byte) error) error {
var err error
var version int
in := bufio.NewReaderSize(rs, 16*1024*1024)
for ln := 0; ; ln++ {
if ln > 0 {
nl, err := in.Peek(1)
if err != nil {
return err
}
if nl[0] == 0xa {
in.ReadByte()
break
}
}
lineb, _, err := in.ReadLine()
if err != nil {
return err
}
line := string(lineb)
switch ln {
case 0:
if line != "SNAP" && line != "XLOG" {
return errors.New("missing SNAP/XLOG header")
}
case 1:
if line == "0.12" {
version = 12
} else if line == "0.13" {
version = 13
} else {
return fmt.Errorf("unknown snapshot version: %s", line)
}
}
}
var fixh [XRowFixedHeaderSize]byte
var xrow, zrow []byte
var zr *zstd.Decoder
if version != 12 {
if zr, err = zstd.NewReader(nil); err != nil {
return err
}
defer zr.Close()
}
for {
var n int
var ulen uint
if n, err = io.ReadFull(in, fixh[:]); err == io.EOF {
return nil
}
if n == 4 && binary.BigEndian.Uint32(fixh[0:4]) == XRowFixedHeaderEof {
return nil
}
if err != nil {
return err
}
compressed := false
if zr != nil {
compressed = binary.BigEndian.Uint32(fixh[0:4]) == ZRowFixedHeaderMagic
}
if !compressed && binary.BigEndian.Uint32(fixh[0:4]) != XRowFixedHeaderMagic {
return fmt.Errorf("bad xrow magic %0X", fixh[0:4])
}
buf := fixh[4:]
if ulen, _, err = msgp.ReadUintBytes(buf); err != nil {
return err
}
rlen := int(ulen)
if rlen <= in.Buffered() {
if buf, err = in.Peek(rlen); err != nil {
return err
}
if _, err = in.Discard(rlen); err != nil {
return err
}
} else {
if rlen > cap(zrow) {
zrow = make([]byte, 0, rlen+1024)
}
if _, err = io.ReadFull(in, zrow[:rlen]); err != nil {
return err
}
buf = zrow[:rlen]
}
if compressed {
if xrow, err = zr.DecodeAll(buf, xrow); err != nil {
return err
}
buf = xrow
xrow = xrow[:0]
}
for len(buf) > 0 {
// meta map: timestamp, lsn, etc
if buf, err = msgp.Skip(buf); err != nil {
return err
}
var ml uint32
if ml, buf, err = msgp.ReadMapHeaderBytes(buf); err != nil {
return err
}
var space uint
var tuple []byte
for ; ml > 0; ml-- {
var cd uint
if cd, buf, err = msgp.ReadUintBytes(buf); err != nil {
return err
}
switch cd {
case tarantool.KeySpaceNo:
if space, buf, err = msgp.ReadUintBytes(buf); err != nil {
return err
}
case tarantool.KeyTuple:
var curbuf = buf
if buf, err = msgp.Skip(buf); err != nil {
return err
}
tuple = curbuf[:len(curbuf)-len(buf)]
default:
if buf, err = msgp.Skip(buf); err != nil {
return err
}
}
}
if space == 0 || tuple == nil {
continue
}
if err = tuplecb(space, tuple); err != nil {
return err
}
}
}
}
func ReadSnapshot(rs io.Reader, tuplecb func(space uint, tuple []interface{}) error) error {
return ReadSnapshotPacked(rs, func(space uint, buf []byte) error {
var err error
var tinf interface{}
if tinf, _, err = msgp.ReadIntfBytes(buf); err != nil {
return err
}
return tuplecb(space, tinf.([]interface{}))
})
}