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loader.go
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loader.go
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// Copyright 2016 CodisLabs. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package rdb
import (
"bytes"
"encoding/binary"
"hash"
"io"
"strconv"
"pkg/libs/errors"
"pkg/libs/log"
"pkg/rdb/digest"
)
type Loader struct {
*rdbReader
crc hash.Hash64
db uint32
lastEntry *BinEntry
}
func NewLoader(r io.Reader) *Loader {
l := &Loader{}
l.crc = digest.New()
l.rdbReader = NewRdbReader(io.TeeReader(r, l.crc))
return l
}
func (l *Loader) Header() error {
header := make([]byte, 9)
if err := l.readFull(header); err != nil {
return err
}
if !bytes.Equal(header[:5], []byte("REDIS")) {
return errors.Errorf("verify magic string, invalid file format")
}
if version, err := strconv.ParseInt(string(header[5:]), 10, 64); err != nil {
return errors.Trace(err)
} else if version <= 0 || version > FromVersion {
return errors.Errorf("verify version, invalid RDB version number %d, %d", version, FromVersion)
}
return nil
}
func (l *Loader) Footer() error {
crc1 := l.crc.Sum64()
if crc2, err := l.readUint64(); err != nil {
return err
} else if crc1 != crc2 {
return errors.Errorf("checksum validation failed")
}
return nil
}
type BinEntry struct {
DB uint32
Key []byte
Type byte
Value []byte
ExpireAt uint64
RealMemberCount uint32
NeedReadLen byte
IdleTime uint32
Freq uint8
}
func (e *BinEntry) ObjEntry() (*ObjEntry, error) {
x, err := DecodeDump(e.Value)
if err != nil {
return nil, err
}
return &ObjEntry{
DB: e.DB,
Key: e.Key,
Type: e.Type,
Value: x,
ExpireAt: e.ExpireAt,
RealMemberCount: e.RealMemberCount,
NeedReadLen: e.NeedReadLen,
}, nil
}
type ObjEntry struct {
DB uint32
Key []byte
Type byte
Value interface{}
ExpireAt uint64
RealMemberCount uint32
NeedReadLen byte
}
func (e *ObjEntry) BinEntry() (*BinEntry, error) {
p, err := EncodeDump(e.Value)
if err != nil {
return nil, err
}
return &BinEntry{
DB: e.DB,
Key: e.Key,
Type: e.Type,
Value: p,
ExpireAt: e.ExpireAt,
RealMemberCount: e.RealMemberCount,
NeedReadLen: e.NeedReadLen,
}, nil
}
func (l *Loader) NextBinEntry() (*BinEntry, error) {
var entry = &BinEntry{}
for {
var t byte
if l.remainMember != 0 {
t = l.lastEntry.Type
} else {
rtype, err := l.ReadByte()
if err != nil {
return nil, err
}
t = rtype
}
switch t {
case RdbFlagAUX:
aux_key, _ := l.ReadString()
aux_value, _ := l.ReadString()
log.Info("Aux information key:", string(aux_key), " value:", string(aux_value))
if string(aux_key) == "lua" {
// we should handle the lua script
entry.DB = l.db
entry.Key = aux_key
entry.Type = t
entry.Value = aux_value
return entry, nil
}
case rdbFlagResizeDB:
db_size, _ := l.ReadLength()
expire_size, _ := l.ReadLength()
log.Info("db_size:", db_size, " expire_size:", expire_size)
case rdbFlagExpiryMS:
ttlms, err := l.readUint64()
if err != nil {
return nil, err
}
entry.ExpireAt = ttlms
case rdbFlagExpiry:
ttls, err := l.readUint32()
if err != nil {
return nil, err
}
entry.ExpireAt = uint64(ttls) * 1000
case rdbFlagSelectDB:
dbnum, err := l.ReadLength()
if err != nil {
return nil, err
}
l.db = dbnum
case rdbFlagEOF:
return nil, nil
case rdbFlagModuleAux:
// currently, ignore this filed
_, err := l.ReadLength() // module-id
if err != nil {
return nil, err
}
// skip module
if err = rdbLoadCheckModuleValue(l); err != nil {
return nil, err
}
case rdbFlagIdle:
// ignore idle because target redis doesn't support this for given key
idle, err := l.ReadLength()
if err != nil {
return nil, err
}
entry.IdleTime = idle
case rdbFlagFreq:
// ignore freq because target redis doesn't support this for given key
freq, err := l.readUint8()
if err != nil {
return nil, err
}
entry.Freq = freq
default:
var key []byte
if l.remainMember == 0 {
// first time visit this key.
rkey, err := l.ReadString()
if err != nil {
return nil, err
}
key = rkey
entry.NeedReadLen = 1 // read value length when it's the first time.
} else {
key = l.lastEntry.Key
}
//log.Debugf("l %p r %p", l, l.rdbReader)
//log.Debug("remainMember:", l.remainMember, " key:", string(key[:]), " type:", t)
//log.Debug("r.remainMember:", l.rdbReader.remainMember)
val, err := l.readObjectValue(t, l)
if err != nil {
return nil, err
}
entry.DB = l.db
entry.Key = key
entry.Type = t
entry.Value = createValueDump(t, val)
// entry.RealMemberCount = l.lastReadCount
if l.lastReadCount == l.totMemberCount {
entry.RealMemberCount = 0
} else {
// RealMemberCount > 0 means this is big entry which also is a split key.
entry.RealMemberCount = l.lastReadCount
}
l.lastEntry = entry
return entry, nil
}
}
}
func createValueDump(t byte, val []byte) []byte {
var b bytes.Buffer
c := digest.New()
w := io.MultiWriter(&b, c)
w.Write([]byte{t})
w.Write(val)
binary.Write(w, binary.LittleEndian, uint16(ToVersion))
binary.Write(w, binary.LittleEndian, c.Sum64())
return b.Bytes()
}