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refactor, can not build and run at all

This commit is contained in:
siddontang 2014-09-17 17:54:04 +08:00
parent 3a37b2e297
commit 8b8745be92
25 changed files with 450 additions and 823 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
cmd/ledis-binlog/main.go
View File

@ -1,85 +0,0 @@
package main
import (
"bufio"
"flag"
"fmt"
"github.com/siddontang/ledisdb/ledis"
"os"
"time"
)
var TimeFormat = "2006-01-02 15:04:05"
var startDateTime = flag.String("start-datetime", "",
"Start reading the binary log at the first event having a timestamp equal to or later than the datetime argument.")
var stopDateTime = flag.String("stop-datetime", "",
"Stop reading the binary log at the first event having a timestamp equal to or earlier than the datetime argument.")
var startTime uint32 = 0
var stopTime uint32 = 0xFFFFFFFF
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s [options] log_file\n", os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
logFile := flag.Arg(0)
f, err := os.Open(logFile)
if err != nil {
println(err.Error())
return
}
defer f.Close()
var t time.Time
if len(*startDateTime) > 0 {
if t, err = time.Parse(TimeFormat, *startDateTime); err != nil {
println("parse start-datetime error: ", err.Error())
return
}
startTime = uint32(t.Unix())
}
if len(*stopDateTime) > 0 {
if t, err = time.Parse(TimeFormat, *stopDateTime); err != nil {
println("parse stop-datetime error: ", err.Error())
return
}
stopTime = uint32(t.Unix())
}
rb := bufio.NewReaderSize(f, 4096)
err = ledis.ReadEventFromReader(rb, printEvent)
if err != nil {
println("read event error: ", err.Error())
return
}
}
func printEvent(head *ledis.BinLogHead, event []byte) error {
if head.CreateTime < startTime || head.CreateTime > stopTime {
return nil
}
t := time.Unix(int64(head.CreateTime), 0)
fmt.Printf("%s ", t.Format(TimeFormat))
s, err := ledis.FormatBinLogEvent(event)
if err != nil {
fmt.Printf("%s", err.Error())
} else {
fmt.Printf(s)
}
fmt.Printf("\n")
return nil
}

15
cmd/ledis-load/main.go
View File

@ -57,18 +57,5 @@ func loadDump(cfg *config.Config, ldb *ledis.Ledis) error {
return err return err
} }
var head *ledis.BinLogAnchor return ldb.LoadDumpFile(*dumpPath)
head, err = ldb.LoadDumpFile(*dumpPath)
if err != nil {
return err
}
//master enable binlog, here output this like mysql
if head.LogFileIndex != 0 && head.LogPos != 0 {
format := "MASTER_LOG_FILE='binlog.%07d', MASTER_LOG_POS=%d;\n"
fmt.Printf(format, head.LogFileIndex, head.LogPos)
}
return nil
} }

35
config/config.go
View File

@ -16,14 +16,6 @@ const (
DefaultDataDir string = "./var" DefaultDataDir string = "./var"
) )
const (
MaxBinLogFileSize int = 1024 * 1024 * 1024
MaxBinLogFileNum int = 10000
DefaultBinLogFileSize int = MaxBinLogFileSize
DefaultBinLogFileNum int = 10
)
type LevelDBConfig struct { type LevelDBConfig struct {
Compression bool `toml:"compression"` Compression bool `toml:"compression"`
BlockSize int `toml:"block_size"` BlockSize int `toml:"block_size"`
@ -37,9 +29,8 @@ type LMDBConfig struct {
NoSync bool `toml:"nosync"` NoSync bool `toml:"nosync"`
} }
type BinLogConfig struct { type WALConfig struct {
MaxFileSize int `toml:"max_file_size"` Path string `toml:"path"`
MaxFileNum int `toml:"max_file_num"`
} }
type Config struct { type Config struct {
@ -52,11 +43,13 @@ type Config struct {
DBName string `toml:"db_name"` DBName string `toml:"db_name"`
DBPath string `toml:"db_path"` DBPath string `toml:"db_path"`
UseWAL bool `toml:use_wal`
LevelDB LevelDBConfig `toml:"leveldb"` LevelDB LevelDBConfig `toml:"leveldb"`
LMDB LMDBConfig `toml:"lmdb"` LMDB LMDBConfig `toml:"lmdb"`
BinLog BinLogConfig `toml:"binlog"` WAL WALConfig `toml:wal`
SlaveOf string `toml:"slaveof"` SlaveOf string `toml:"slaveof"`
@ -93,10 +86,6 @@ func NewConfigDefault() *Config {
cfg.DBName = DefaultDBName cfg.DBName = DefaultDBName
// disable binlog
cfg.BinLog.MaxFileNum = 0
cfg.BinLog.MaxFileSize = 0
// disable replication // disable replication
cfg.SlaveOf = "" cfg.SlaveOf = ""
@ -126,17 +115,3 @@ func (cfg *LevelDBConfig) Adjust() {
cfg.MaxOpenFiles = 1024 cfg.MaxOpenFiles = 1024
} }
} }
func (cfg *BinLogConfig) Adjust() {
if cfg.MaxFileSize <= 0 {
cfg.MaxFileSize = DefaultBinLogFileSize
} else if cfg.MaxFileSize > MaxBinLogFileSize {
cfg.MaxFileSize = MaxBinLogFileSize
}
if cfg.MaxFileNum <= 0 {
cfg.MaxFileNum = DefaultBinLogFileNum
} else if cfg.MaxFileNum > MaxBinLogFileNum {
cfg.MaxFileNum = MaxBinLogFileNum
}
}

10
config/config.toml
View File

@ -30,6 +30,8 @@ db_name = "leveldb"
# if not set, use data_dir/"db_name"_data # if not set, use data_dir/"db_name"_data
db_path = "" db_path = ""
use_wal = true
[leveldb] [leveldb]
compression = false compression = false
block_size = 32768 block_size = 32768
@ -41,8 +43,10 @@ max_open_files = 1024
map_size = 524288000 map_size = 524288000
nosync = true nosync = true
[binlog] [wal]
max_file_size = 0 # if not set, use data_dir/wal
max_file_num = 0 path = ""

7
etc/ledis.conf
View File

@ -43,9 +43,8 @@ max_open_files = 1024
map_size = 524288000 map_size = 524288000
nosync = true nosync = true
[binlog] [wal]
# Set either size or num to 0 to disable binlog # if not set, use data_dir/wal
max_file_size = 0 path = ""
max_file_num = 0

40
ledis/batch.go
View File

@ -12,9 +12,11 @@ type batch struct {
sync.Locker sync.Locker
logs [][]byte eb *eventBatch
tx *Tx tx *Tx
noLogging bool
} }
func (b *batch) Commit() error { func (b *batch) Commit() error {
@ -23,17 +25,6 @@ func (b *batch) Commit() error {
err := b.WriteBatch.Commit() err := b.WriteBatch.Commit()
if b.l.binlog != nil {
if err == nil {
if b.tx == nil {
b.l.binlog.Log(b.logs...)
} else {
b.tx.logs = append(b.tx.logs, b.logs...)
}
}
b.logs = [][]byte{}
}
return err return err
} }
@ -42,29 +33,28 @@ func (b *batch) Lock() {
} }
func (b *batch) Unlock() { func (b *batch) Unlock() {
if b.l.binlog != nil { b.noLogging = false
b.logs = [][]byte{}
}
b.WriteBatch.Rollback() b.WriteBatch.Rollback()
b.Locker.Unlock() b.Locker.Unlock()
} }
func (b *batch) Put(key []byte, value []byte) { func (b *batch) Put(key []byte, value []byte) {
if b.l.binlog != nil {
buf := encodeBinLogPut(key, value)
b.logs = append(b.logs, buf)
}
b.WriteBatch.Put(key, value) b.WriteBatch.Put(key, value)
} }
func (b *batch) Delete(key []byte) { func (b *batch) Delete(key []byte) {
if b.l.binlog != nil {
buf := encodeBinLogDelete(key)
b.logs = append(b.logs, buf)
}
b.WriteBatch.Delete(key) b.WriteBatch.Delete(key)
} }
func (b *batch) LogEanbled() bool {
return !b.noLogging && b.l.log != nil
}
func (b *batch) DisableLog(d bool) {
b.noLogging = d
}
type dbBatchLocker struct { type dbBatchLocker struct {
l *sync.Mutex l *sync.Mutex
wrLock *sync.RWMutex wrLock *sync.RWMutex
@ -100,6 +90,8 @@ func (l *Ledis) newBatch(wb store.WriteBatch, locker sync.Locker, tx *Tx) *batch
b.tx = tx b.tx = tx
b.Locker = locker b.Locker = locker
b.logs = [][]byte{} b.eb = new(eventBatch)
b.noLogging = false
return b return b
} }

400
ledis/binlog.go
View File

@ -1,400 +0,0 @@
package ledis
import (
"bufio"
"encoding/binary"
"fmt"
"github.com/siddontang/go-log/log"
"github.com/siddontang/ledisdb/config"
"io"
"io/ioutil"
"os"
"path"
"strconv"
"strings"
"sync"
"time"
)
type BinLogHead struct {
CreateTime uint32
BatchId uint32
PayloadLen uint32
}
func (h *BinLogHead) Len() int {
return 12
}
func (h *BinLogHead) Write(w io.Writer) error {
if err := binary.Write(w, binary.BigEndian, h.CreateTime); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, h.BatchId); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, h.PayloadLen); err != nil {
return err
}
return nil
}
func (h *BinLogHead) handleReadError(err error) error {
if err == io.EOF {
return io.ErrUnexpectedEOF
} else {
return err
}
}
func (h *BinLogHead) Read(r io.Reader) error {
var err error
if err = binary.Read(r, binary.BigEndian, &h.CreateTime); err != nil {
return err
}
if err = binary.Read(r, binary.BigEndian, &h.BatchId); err != nil {
return h.handleReadError(err)
}
if err = binary.Read(r, binary.BigEndian, &h.PayloadLen); err != nil {
return h.handleReadError(err)
}
return nil
}
func (h *BinLogHead) InSameBatch(ho *BinLogHead) bool {
if h.CreateTime == ho.CreateTime && h.BatchId == ho.BatchId {
return true
} else {
return false
}
}
/*
index file format:
ledis-bin.00001
ledis-bin.00002
ledis-bin.00003
log file format
Log: Head|PayloadData
Head: createTime|batchId|payloadData
*/
type BinLog struct {
sync.Mutex
path string
cfg *config.BinLogConfig
logFile *os.File
logWb *bufio.Writer
indexName string
logNames []string
lastLogIndex int64
batchId uint32
ch chan struct{}
}
func NewBinLog(cfg *config.Config) (*BinLog, error) {
l := new(BinLog)
l.cfg = &cfg.BinLog
l.cfg.Adjust()
l.path = path.Join(cfg.DataDir, "binlog")
if err := os.MkdirAll(l.path, 0755); err != nil {
return nil, err
}
l.logNames = make([]string, 0, 16)
l.ch = make(chan struct{})
if err := l.loadIndex(); err != nil {
return nil, err
}
return l, nil
}
func (l *BinLog) flushIndex() error {
data := strings.Join(l.logNames, "\n")
bakName := fmt.Sprintf("%s.bak", l.indexName)
f, err := os.OpenFile(bakName, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
log.Error("create binlog bak index error %s", err.Error())
return err
}
if _, err := f.WriteString(data); err != nil {
log.Error("write binlog index error %s", err.Error())
f.Close()
return err
}
f.Close()
if err := os.Rename(bakName, l.indexName); err != nil {
log.Error("rename binlog bak index error %s", err.Error())
return err
}
return nil
}
func (l *BinLog) loadIndex() error {
l.indexName = path.Join(l.path, fmt.Sprintf("ledis-bin.index"))
if _, err := os.Stat(l.indexName); os.IsNotExist(err) {
//no index file, nothing to do
} else {
indexData, err := ioutil.ReadFile(l.indexName)
if err != nil {
return err
}
lines := strings.Split(string(indexData), "\n")
for _, line := range lines {
line = strings.Trim(line, "\r\n ")
if len(line) == 0 {
continue
}
if _, err := os.Stat(path.Join(l.path, line)); err != nil {
log.Error("load index line %s error %s", line, err.Error())
return err
} else {
l.logNames = append(l.logNames, line)
}
}
}
if l.cfg.MaxFileNum > 0 && len(l.logNames) > l.cfg.MaxFileNum {
//remove oldest logfile
if err := l.Purge(len(l.logNames) - l.cfg.MaxFileNum); err != nil {
return err
}
}
var err error
if len(l.logNames) == 0 {
l.lastLogIndex = 1
} else {
lastName := l.logNames[len(l.logNames)-1]
if l.lastLogIndex, err = strconv.ParseInt(path.Ext(lastName)[1:], 10, 64); err != nil {
log.Error("invalid logfile name %s", err.Error())
return err
}
//like mysql, if server restart, a new binlog will create
l.lastLogIndex++
}
return nil
}
func (l *BinLog) getLogFile() string {
return l.FormatLogFileName(l.lastLogIndex)
}
func (l *BinLog) openNewLogFile() error {
var err error
lastName := l.getLogFile()
logPath := path.Join(l.path, lastName)
if l.logFile, err = os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY, 0666); err != nil {
log.Error("open new logfile error %s", err.Error())
return err
}
if l.cfg.MaxFileNum > 0 && len(l.logNames) == l.cfg.MaxFileNum {
l.purge(1)
}
l.logNames = append(l.logNames, lastName)
if l.logWb == nil {
l.logWb = bufio.NewWriterSize(l.logFile, 1024)
} else {
l.logWb.Reset(l.logFile)
}
if err = l.flushIndex(); err != nil {
return err
}
return nil
}
func (l *BinLog) checkLogFileSize() bool {
if l.logFile == nil {
return false
}
st, _ := l.logFile.Stat()
if st.Size() >= int64(l.cfg.MaxFileSize) {
l.closeLog()
return true
}
return false
}
func (l *BinLog) closeLog() {
if l.logFile == nil {
return
}
l.lastLogIndex++
l.logFile.Close()
l.logFile = nil
}
func (l *BinLog) purge(n int) {
if len(l.logNames) < n {
n = len(l.logNames)
}
for i := 0; i < n; i++ {
logPath := path.Join(l.path, l.logNames[i])
os.Remove(logPath)
}
copy(l.logNames[0:], l.logNames[n:])
l.logNames = l.logNames[0 : len(l.logNames)-n]
}
func (l *BinLog) Close() {
if l.logFile != nil {
l.logFile.Close()
l.logFile = nil
}
}
func (l *BinLog) LogNames() []string {
return l.logNames
}
func (l *BinLog) LogFileName() string {
return l.getLogFile()
}
func (l *BinLog) LogFilePos() int64 {
if l.logFile == nil {
return 0
} else {
st, _ := l.logFile.Stat()
return st.Size()
}
}
func (l *BinLog) LogFileIndex() int64 {
return l.lastLogIndex
}
func (l *BinLog) FormatLogFileName(index int64) string {
return fmt.Sprintf("ledis-bin.%07d", index)
}
func (l *BinLog) FormatLogFilePath(index int64) string {
return path.Join(l.path, l.FormatLogFileName(index))
}
func (l *BinLog) LogPath() string {
return l.path
}
func (l *BinLog) Purge(n int) error {
l.Lock()
defer l.Unlock()
if len(l.logNames) == 0 {
return nil
}
if n >= len(l.logNames) {
n = len(l.logNames)
//can not purge current log file
if l.logNames[n-1] == l.getLogFile() {
n = n - 1
}
}
l.purge(n)
return l.flushIndex()
}
func (l *BinLog) PurgeAll() error {
l.Lock()
defer l.Unlock()
l.closeLog()
l.purge(len(l.logNames))
return l.openNewLogFile()
}
func (l *BinLog) Log(args ...[]byte) error {
l.Lock()
defer l.Unlock()
var err error
if l.logFile == nil {
if err = l.openNewLogFile(); err != nil {
return err
}
}
head := &BinLogHead{}
head.CreateTime = uint32(time.Now().Unix())
head.BatchId = l.batchId
l.batchId++
for _, data := range args {
head.PayloadLen = uint32(len(data))
if err := head.Write(l.logWb); err != nil {
return err
}
if _, err := l.logWb.Write(data); err != nil {
return err
}
}
if err = l.logWb.Flush(); err != nil {
log.Error("write log error %s", err.Error())
return err
}
l.checkLogFileSize()
close(l.ch)
l.ch = make(chan struct{})
return nil
}
func (l *BinLog) Wait() <-chan struct{} {
return l.ch
}

49
ledis/binlog_test.go
View File

@ -1,49 +0,0 @@
package ledis
import (
"github.com/siddontang/ledisdb/config"
"io/ioutil"
"os"
"testing"
)
func TestBinLog(t *testing.T) {
cfg := new(config.Config)
cfg.BinLog.MaxFileNum = 1
cfg.BinLog.MaxFileSize = 1024
cfg.DataDir = "/tmp/ledis_binlog"
os.RemoveAll(cfg.DataDir)
b, err := NewBinLog(cfg)
if err != nil {
t.Fatal(err)
}
if err := b.Log(make([]byte, 1024)); err != nil {
t.Fatal(err)
}
if err := b.Log(make([]byte, 1024)); err != nil {
t.Fatal(err)
}
if fs, err := ioutil.ReadDir(b.LogPath()); err != nil {
t.Fatal(err)
} else if len(fs) != 2 {
t.Fatal(len(fs))
}
if err := b.PurgeAll(); err != nil {
t.Fatal(err)
}
if fs, err := ioutil.ReadDir(b.LogPath()); err != nil {
t.Fatal(err)
} else if len(fs) != 2 {
t.Fatal(len(fs))
} else if b.LogFilePos() != 0 {
t.Fatal(b.LogFilePos())
}
}

6
ledis/const.go
View File

@ -81,12 +81,6 @@ var (
ErrScoreMiss = errors.New("zset score miss") ErrScoreMiss = errors.New("zset score miss")
) )
const (
BinLogTypeDeletion uint8 = 0x0
BinLogTypePut uint8 = 0x1
BinLogTypeCommand uint8 = 0x2
)
const ( const (
DBAutoCommit uint8 = 0x0 DBAutoCommit uint8 = 0x0
DBInTransaction uint8 = 0x1 DBInTransaction uint8 = 0x1

77
ledis/dump.go
View File

@ -9,42 +9,6 @@ import (
"os" "os"
) )
//dump format
// fileIndex(bigendian int64)|filePos(bigendian int64)
// |keylen(bigendian int32)|key|valuelen(bigendian int32)|value......
//
//key and value are both compressed for fast transfer dump on network using snappy
type BinLogAnchor struct {
LogFileIndex int64
LogPos int64
}
func (m *BinLogAnchor) WriteTo(w io.Writer) error {
if err := binary.Write(w, binary.BigEndian, m.LogFileIndex); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, m.LogPos); err != nil {
return err
}
return nil
}
func (m *BinLogAnchor) ReadFrom(r io.Reader) error {
err := binary.Read(r, binary.BigEndian, &m.LogFileIndex)
if err != nil {
return err
}
err = binary.Read(r, binary.BigEndian, &m.LogPos)
if err != nil {
return err
}
return nil
}
func (l *Ledis) DumpFile(path string) error { func (l *Ledis) DumpFile(path string) error {
f, err := os.Create(path) f, err := os.Create(path)
if err != nil { if err != nil {
@ -56,18 +20,11 @@ func (l *Ledis) DumpFile(path string) error {
} }
func (l *Ledis) Dump(w io.Writer) error { func (l *Ledis) Dump(w io.Writer) error {
m := new(BinLogAnchor)
var err error var err error
l.wLock.Lock() l.wLock.Lock()
defer l.wLock.Unlock() defer l.wLock.Unlock()
if l.binlog != nil {
m.LogFileIndex = l.binlog.LogFileIndex()
m.LogPos = l.binlog.LogFilePos()
}
wb := bufio.NewWriterSize(w, 4096) wb := bufio.NewWriterSize(w, 4096)
if err = m.WriteTo(wb); err != nil { if err = m.WriteTo(wb); err != nil {
return err return err
@ -118,7 +75,7 @@ func (l *Ledis) Dump(w io.Writer) error {
return nil return nil
} }
func (l *Ledis) LoadDumpFile(path string) (*BinLogAnchor, error) { func (l *Ledis) LoadDumpFile(path string) error {
f, err := os.Open(path) f, err := os.Open(path)
if err != nil { if err != nil {
return nil, err return nil, err
@ -128,19 +85,12 @@ func (l *Ledis) LoadDumpFile(path string) (*BinLogAnchor, error) {
return l.LoadDump(f) return l.LoadDump(f)
} }
func (l *Ledis) LoadDump(r io.Reader) (*BinLogAnchor, error) { func (l *Ledis) LoadDump(r io.Reader) error {
l.wLock.Lock() l.wLock.Lock()
defer l.wLock.Unlock() defer l.wLock.Unlock()
info := new(BinLogAnchor)
rb := bufio.NewReaderSize(r, 4096) rb := bufio.NewReaderSize(r, 4096)
err := info.ReadFrom(rb)
if err != nil {
return nil, err
}
var keyLen uint16 var keyLen uint16
var valueLen uint32 var valueLen uint32
@ -154,33 +104,33 @@ func (l *Ledis) LoadDump(r io.Reader) (*BinLogAnchor, error) {
for { for {
if err = binary.Read(rb, binary.BigEndian, &keyLen); err != nil && err != io.EOF { if err = binary.Read(rb, binary.BigEndian, &keyLen); err != nil && err != io.EOF {
return nil, err return err
} else if err == io.EOF { } else if err == io.EOF {
break break
} }
if _, err = io.CopyN(&keyBuf, rb, int64(keyLen)); err != nil { if _, err = io.CopyN(&keyBuf, rb, int64(keyLen)); err != nil {
return nil, err return err
} }
if key, err = snappy.Decode(deKeyBuf, keyBuf.Bytes()); err != nil { if key, err = snappy.Decode(deKeyBuf, keyBuf.Bytes()); err != nil {
return nil, err return err
} }
if err = binary.Read(rb, binary.BigEndian, &valueLen); err != nil { if err = binary.Read(rb, binary.BigEndian, &valueLen); err != nil {
return nil, err return err
} }
if _, err = io.CopyN(&valueBuf, rb, int64(valueLen)); err != nil { if _, err = io.CopyN(&valueBuf, rb, int64(valueLen)); err != nil {
return nil, err return err
} }
if value, err = snappy.Decode(deValueBuf, valueBuf.Bytes()); err != nil { if value, err = snappy.Decode(deValueBuf, valueBuf.Bytes()); err != nil {
return nil, err return err
} }
if err = l.ldb.Put(key, value); err != nil { if err = l.ldb.Put(key, value); err != nil {
return nil, err return err
} }
keyBuf.Reset() keyBuf.Reset()
@ -190,10 +140,11 @@ func (l *Ledis) LoadDump(r io.Reader) (*BinLogAnchor, error) {
deKeyBuf = nil deKeyBuf = nil
deValueBuf = nil deValueBuf = nil
//if binlog enable, we will delete all binlogs and open a new one for handling simply //to do remove all wal log
if l.binlog != nil {
l.binlog.PurgeAll() if l.log != nil {
l.log.Clear()
} }
return info, nil return nil
} }

2
ledis/dump_test.go
View File

@ -38,7 +38,7 @@ func TestDump(t *testing.T) {
t.Fatal(err) t.Fatal(err)
} }
if _, err := slave.LoadDumpFile("/tmp/testdb.dump"); err != nil { if err := slave.LoadDumpFile("/tmp/testdb.dump"); err != nil {
t.Fatal(err) t.Fatal(err)
} }

157
ledis/binlog_util.go → ledis/event.go
View File

@ -1,97 +1,108 @@
package ledis package ledis
import ( import (
"bytes"
"encoding/binary" "encoding/binary"
"errors" "errors"
"fmt" "io"
"strconv" "strconv"
) )
var ( const (
errBinLogDeleteType = errors.New("invalid bin log delete type") kTypeDeleteEvent uint8 = 0
errBinLogPutType = errors.New("invalid bin log put type") kTypePutEvent uint8 = 1
errBinLogCommandType = errors.New("invalid bin log command type")
) )
func encodeBinLogDelete(key []byte) []byte { var (
buf := make([]byte, 1+len(key)) errInvalidPutEvent = errors.New("invalid put event")
buf[0] = BinLogTypeDeletion errInvalidDeleteEvent = errors.New("invalid delete event")
copy(buf[1:], key) errInvalidEvent = errors.New("invalid event")
return buf )
type eventBatch struct {
bytes.Buffer
} }
func decodeBinLogDelete(sz []byte) ([]byte, error) { type event struct {
if len(sz) < 1 || sz[0] != BinLogTypeDeletion { key []byte
return nil, errBinLogDeleteType value []byte //value = nil for delete event
}
func (b *eventBatch) Put(key []byte, value []byte) {
l := uint32(len(key) + len(value) + 1 + 2)
binary.Write(b, binary.BigEndian, l)
b.WriteByte(kTypePutEvent)
keyLen := uint16(len(key))
binary.Write(b, binary.BigEndian, keyLen)
b.Write(key)
b.Write(value)
}
func (b *eventBatch) Delete(key []byte) {
l := uint32(len(key) + 1)
binary.Write(b, binary.BigEndian, l)
b.WriteByte(kTypeDeleteEvent)
b.Write(key)
}
func decodeEventBatch(data []byte) (ev []event, err error) {
ev = make([]event, 0, 16)
for {
if len(data) == 0 {
return ev, nil
}
if len(data) < 4 {
return nil, io.ErrUnexpectedEOF
}
l := binary.BigEndian.Uint32(data)
data = data[4:]
if uint32(len(data)) < l {
return nil, io.ErrUnexpectedEOF
}
var e event
if err := decodeEvent(&e, data[0:l]); err != nil {
return nil, err
}
ev = append(ev, e)
data = data[l:]
}
}
func decodeEvent(e *event, b []byte) error {
if len(b) == 0 {
return errInvalidEvent
} }
return sz[1:], nil switch b[0] {
} case kTypePutEvent:
if len(b[1:]) < 2 {
return errInvalidPutEvent
}
func encodeBinLogPut(key []byte, value []byte) []byte { keyLen := binary.BigEndian.Uint16(b[1:3])
buf := make([]byte, 3+len(key)+len(value)) b = b[3:]
buf[0] = BinLogTypePut if len(b) < int(keyLen) {
pos := 1 return errInvalidPutEvent
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key))) }
pos += 2
copy(buf[pos:], key)
pos += len(key)
copy(buf[pos:], value)
return buf e.key = b[0:keyLen]
} e.value = b[keyLen:]
case kTypeDeleteEvent:
func decodeBinLogPut(sz []byte) ([]byte, []byte, error) { e.value = nil
if len(sz) < 3 || sz[0] != BinLogTypePut { e.key = b[1:]
return nil, nil, errBinLogPutType
}
keyLen := int(binary.BigEndian.Uint16(sz[1:]))
if 3+keyLen > len(sz) {
return nil, nil, errBinLogPutType
}
return sz[3 : 3+keyLen], sz[3+keyLen:], nil
}
func FormatBinLogEvent(event []byte) (string, error) {
logType := uint8(event[0])
var err error
var k []byte
var v []byte
var buf []byte = make([]byte, 0, 1024)
switch logType {
case BinLogTypePut:
k, v, err = decodeBinLogPut(event)
buf = append(buf, "PUT "...)
case BinLogTypeDeletion:
k, err = decodeBinLogDelete(event)
buf = append(buf, "DELETE "...)
default: default:
err = errInvalidBinLogEvent return errInvalidEvent
} }
if err != nil { return nil
return "", err
}
if buf, err = formatDataKey(buf, k); err != nil {
return "", err
}
if v != nil && len(v) != 0 {
buf = append(buf, fmt.Sprintf(" %q", v)...)
}
return String(buf), nil
} }
func formatDataKey(buf []byte, k []byte) ([]byte, error) { func formatEventKey(buf []byte, k []byte) ([]byte, error) {
if len(k) < 2 { if len(k) < 2 {
return nil, errInvalidBinLogEvent return nil, errInvalidEvent
} }
buf = append(buf, fmt.Sprintf("DB:%2d ", k[0])...) buf = append(buf, fmt.Sprintf("DB:%2d ", k[0])...)
@ -208,7 +219,7 @@ func formatDataKey(buf []byte, k []byte) ([]byte, error) {
buf = strconv.AppendQuote(buf, String(key)) buf = strconv.AppendQuote(buf, String(key))
} }
default: default:
return nil, errInvalidBinLogEvent return nil, errInvalidEvent
} }
return buf, nil return buf, nil

34
ledis/event_test.go Normal file
View File

@ -0,0 +1,34 @@
package ledis
import (
"reflect"
"testing"
)
func TestEvent(t *testing.T) {
k1 := []byte("k1")
v1 := []byte("v1")
k2 := []byte("k2")
k3 := []byte("k3")
v3 := []byte("v3")
b := new(eventBatch)
b.Put(k1, v1)
b.Delete(k2)
b.Put(k3, v3)
buf := b.Bytes()
ev2 := []event{
event{k1, v1},
event{k2, nil},
event{k3, v3},
}
if ev, err := decodeEventBatch(buf); err != nil {
t.Fatal(err)
} else if !reflect.DeepEqual(ev, ev2) {
t.Fatal("not equal")
}
}

18
ledis/ledis.go
View File

@ -5,6 +5,7 @@ import (
"github.com/siddontang/go-log/log" "github.com/siddontang/go-log/log"
"github.com/siddontang/ledisdb/config" "github.com/siddontang/ledisdb/config"
"github.com/siddontang/ledisdb/store" "github.com/siddontang/ledisdb/store"
"github.com/siddontang/ledisdb/wal"
"sync" "sync"
"time" "time"
) )
@ -18,10 +19,12 @@ type Ledis struct {
quit chan struct{} quit chan struct{}
jobs *sync.WaitGroup jobs *sync.WaitGroup
binlog *BinLog log wal.Store
wLock sync.RWMutex //allow one write at same time wLock sync.RWMutex //allow one write at same time
commitLock sync.Mutex //allow one write commit at same time commitLock sync.Mutex //allow one write commit at same time
readOnly bool
} }
func Open(cfg *config.Config) (*Ledis, error) { func Open(cfg *config.Config) (*Ledis, error) {
@ -41,13 +44,10 @@ func Open(cfg *config.Config) (*Ledis, error) {
l.ldb = ldb l.ldb = ldb
if cfg.BinLog.MaxFileNum > 0 && cfg.BinLog.MaxFileSize > 0 { if cfg.UseWAL {
l.binlog, err = NewBinLog(cfg) if l.log, err = wal.NewStore(cfg); err != nil {
if err != nil {
return nil, err return nil, err
} }
} else {
l.binlog = nil
} }
for i := uint8(0); i < MaxDBNumber; i++ { for i := uint8(0); i < MaxDBNumber; i++ {
@ -65,9 +65,9 @@ func (l *Ledis) Close() {
l.ldb.Close() l.ldb.Close()
if l.binlog != nil { if l.log != nil {
l.binlog.Close() l.log.Close()
l.binlog = nil l.log = nil
} }
} }

2
ledis/ledis_test.go
View File

@ -14,8 +14,6 @@ func getTestDB() *DB {
f := func() { f := func() {
cfg := new(config.Config) cfg := new(config.Config)
cfg.DataDir = "/tmp/test_ledis" cfg.DataDir = "/tmp/test_ledis"
// cfg.BinLog.MaxFileSize = 1073741824
// cfg.BinLog.MaxFileNum = 3
os.RemoveAll(cfg.DataDir) os.RemoveAll(cfg.DataDir)

2
ledis/t_hash.go
View File

@ -183,8 +183,6 @@ func (db *DB) HSet(key []byte, field []byte, value []byte) (int64, error) {
return 0, err return 0, err
} }
//todo add binlog
err = t.Commit() err = t.Commit()
return n, err return n, err
} }

5
ledis/t_kv.go
View File

@ -77,8 +77,6 @@ func (db *DB) incr(key []byte, delta int64) (int64, error) {
t.Put(key, StrPutInt64(n)) t.Put(key, StrPutInt64(n))
//todo binlog
err = t.Commit() err = t.Commit()
return n, err return n, err
} }
@ -244,7 +242,6 @@ func (db *DB) MSet(args ...KVPair) error {
t.Put(key, value) t.Put(key, value)
//todo binlog
} }
err = t.Commit() err = t.Commit()
@ -297,8 +294,6 @@ func (db *DB) SetNX(key []byte, value []byte) (int64, error) {
} else { } else {
t.Put(key, value) t.Put(key, value)
//todo binlog
err = t.Commit() err = t.Commit()
} }

4
ledis/t_zset.go
View File

@ -305,7 +305,6 @@ func (db *DB) ZAdd(key []byte, args ...ScorePair) (int64, error) {
return 0, err return 0, err
} }
//todo add binlog
err := t.Commit() err := t.Commit()
return num, err return num, err
} }
@ -862,7 +861,6 @@ func (db *DB) ZUnionStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
sk := db.zEncodeSizeKey(destKey) sk := db.zEncodeSizeKey(destKey)
t.Put(sk, PutInt64(num)) t.Put(sk, PutInt64(num))
//todo add binlog
if err := t.Commit(); err != nil { if err := t.Commit(); err != nil {
return 0, err return 0, err
} }
@ -930,7 +928,7 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
var num int64 = int64(len(destMap)) var num int64 = int64(len(destMap))
sk := db.zEncodeSizeKey(destKey) sk := db.zEncodeSizeKey(destKey)
t.Put(sk, PutInt64(num)) t.Put(sk, PutInt64(num))
//todo add binlog
if err := t.Commit(); err != nil { if err := t.Commit(); err != nil {
return 0, err return 0, err
} }

6
ledis/tx.go
View File

@ -15,8 +15,6 @@ type Tx struct {
*DB *DB
tx *store.Tx tx *store.Tx
logs [][]byte
} }
func (db *DB) IsTransaction() bool { func (db *DB) IsTransaction() bool {
@ -71,10 +69,6 @@ func (tx *Tx) Commit() error {
err := tx.tx.Commit() err := tx.tx.Commit()
tx.tx = nil tx.tx = nil
if len(tx.logs) > 0 {
tx.l.binlog.Log(tx.logs...)
}
tx.l.commitLock.Unlock() tx.l.commitLock.Unlock()
tx.l.wLock.Unlock() tx.l.wLock.Unlock()

165
wal/file_store.go
View File

@ -1,25 +1,44 @@
package wal package wal
import ( import (
"fmt"
"github.com/siddontang/go-log/log"
"io/ioutil"
"os" "os"
"path"
"strconv"
"strings"
"sync" "sync"
) )
const ( const (
defaultMaxLogFileSize = 1024 * 1024 * 1024 defaultMaxLogFileSize = 1024 * 1024 * 1024
defaultMaxLogFileNum = 10
) )
/*
index file format:
ledis-bin.00001
ledis-bin.00002
ledis-bin.00003
*/
type FileStore struct { type FileStore struct {
Store Store
m sync.Mutex m sync.Mutex
maxFileSize int maxFileSize int
maxFileNum int
first uint64 first uint64
last uint64 last uint64
logFile *os.File
logNames []string
nextLogIndex int64
indexName string
path string
} }
func NewFileStore(path string) (*FileStore, error) { func NewFileStore(path string) (*FileStore, error) {
@ -29,12 +48,19 @@ func NewFileStore(path string) (*FileStore, error) {
return nil, err return nil, err
} }
s.path = path
s.maxFileSize = defaultMaxLogFileSize s.maxFileSize = defaultMaxLogFileSize
s.maxFileNum = defaultMaxLogFileNum
s.first = 0 s.first = 0
s.last = 0 s.last = 0
s.logNames = make([]string, 0, 16)
if err := s.loadIndex(); err != nil {
return nil, err
}
return s, nil return s, nil
} }
@ -42,10 +68,6 @@ func (s *FileStore) SetMaxFileSize(size int) {
s.maxFileSize = size s.maxFileSize = size
} }
func (s *FileStore) SetMaxFileNum(n int) {
s.maxFileNum = n
}
func (s *FileStore) GetLog(id uint64, log *Log) error { func (s *FileStore) GetLog(id uint64, log *Log) error {
return nil return nil
} }
@ -70,7 +92,11 @@ func (s *FileStore) StoreLogs(logs []*Log) error {
return nil return nil
} }
func (s *FileStore) DeleteRange(start, stop uint64) error { func (s *FileStore) Purge(n uint64) error {
return nil
}
func (s *FileStore) PuregeExpired(n int) error {
return nil return nil
} }
@ -81,3 +107,126 @@ func (s *FileStore) Clear() error {
func (s *FileStore) Close() error { func (s *FileStore) Close() error {
return nil return nil
} }
func (s *FileStore) flushIndex() error {
data := strings.Join(s.logNames, "\n")
bakName := fmt.Sprintf("%s.bak", s.indexName)
f, err := os.OpenFile(bakName, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
log.Error("create bak index error %s", err.Error())
return err
}
if _, err := f.WriteString(data); err != nil {
log.Error("write index error %s", err.Error())
f.Close()
return err
}
f.Close()
if err := os.Rename(bakName, s.indexName); err != nil {
log.Error("rename bak index error %s", err.Error())
return err
}
return nil
}
func (s *FileStore) fileExists(name string) bool {
p := path.Join(s.path, name)
_, err := os.Stat(p)
return !os.IsNotExist(err)
}
func (s *FileStore) loadIndex() error {
s.indexName = path.Join(s.path, fmt.Sprintf("ledis-bin.index"))
if _, err := os.Stat(s.indexName); os.IsNotExist(err) {
//no index file, nothing to do
} else {
indexData, err := ioutil.ReadFile(s.indexName)
if err != nil {
return err
}
lines := strings.Split(string(indexData), "\n")
for _, line := range lines {
line = strings.Trim(line, "\r\n ")
if len(line) == 0 {
continue
}
if s.fileExists(line) {
s.logNames = append(s.logNames, line)
} else {
log.Info("log %s has not exists", line)
}
}
}
var err error
if len(s.logNames) == 0 {
s.nextLogIndex = 1
} else {
lastName := s.logNames[len(s.logNames)-1]
if s.nextLogIndex, err = strconv.ParseInt(path.Ext(lastName)[1:], 10, 64); err != nil {
log.Error("invalid logfile name %s", err.Error())
return err
}
//like mysql, if server restart, a new log will create
s.nextLogIndex++
}
return nil
}
func (s *FileStore) openNewLogFile() error {
var err error
lastName := s.formatLogFileName(s.nextLogIndex)
logPath := path.Join(s.path, lastName)
if s.logFile, err = os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY, 0644); err != nil {
log.Error("open new logfile error %s", err.Error())
return err
}
s.logNames = append(s.logNames, lastName)
if err = s.flushIndex(); err != nil {
return err
}
return nil
}
func (s *FileStore) checkLogFileSize() bool {
if s.logFile == nil {
return false
}
st, _ := s.logFile.Stat()
if st.Size() >= int64(s.maxFileSize) {
s.closeLog()
return true
}
return false
}
func (s *FileStore) closeLog() {
if s.logFile == nil {
return
}
s.nextLogIndex++
s.logFile.Close()
s.logFile = nil
}
func (s *FileStore) formatLogFileName(index int64) string {
return fmt.Sprintf("ledis-bin.%07d", index)
}

57
wal/goleveldb_store.go
View File

@ -2,11 +2,13 @@ package wal
import ( import (
"bytes" "bytes"
"fmt"
"github.com/siddontang/go/num" "github.com/siddontang/go/num"
"github.com/siddontang/ledisdb/config" "github.com/siddontang/ledisdb/config"
"github.com/siddontang/ledisdb/store" "github.com/siddontang/ledisdb/store"
"os" "os"
"sync" "sync"
"time"
) )
type GoLevelDBStore struct { type GoLevelDBStore struct {
@ -132,7 +134,7 @@ func (s *GoLevelDBStore) StoreLogs(logs []*Log) error {
return nil return nil
} }
func (s *GoLevelDBStore) DeleteRange(min, max uint64) error { func (s *GoLevelDBStore) Purge(n uint64) error {
s.m.Lock() s.m.Lock()
defer s.m.Unlock() defer s.m.Unlock()
@ -149,25 +151,16 @@ func (s *GoLevelDBStore) DeleteRange(min, max uint64) error {
return err return err
} }
min = num.MaxUint64(min, first) start := first
max = num.MinUint64(max, last) stop := num.MinUint64(last, first+n)
w := s.db.NewWriteBatch() w := s.db.NewWriteBatch()
defer w.Rollback() defer w.Rollback()
n := 0
s.reset() s.reset()
for i := min; i <= max; i++ { for i := start; i < stop; i++ {
w.Delete(num.Uint64ToBytes(i)) w.Delete(num.Uint64ToBytes(i))
n++
if n > 1024 {
if err = w.Commit(); err != nil {
return err
}
n = 0
}
} }
if err = w.Commit(); err != nil { if err = w.Commit(); err != nil {
@ -177,6 +170,44 @@ func (s *GoLevelDBStore) DeleteRange(min, max uint64) error {
return nil return nil
} }
func (s *GoLevelDBStore) PurgeExpired(n int) error {
if n <= 0 {
return fmt.Errorf("invalid expired time %d", n)
}
t := uint32(time.Now().Unix() - int64(n))
s.m.Lock()
defer s.m.Unlock()
s.reset()
it := s.db.NewIterator()
it.SeekToFirst()
w := s.db.NewWriteBatch()
defer w.Rollback()
l := new(Log)
for ; it.Valid(); it.Next() {
v := it.RawValue()
if err := l.Unmarshal(v); err != nil {
return err
} else if l.CreateTime > t {
break
} else {
w.Delete(it.RawKey())
}
}
if err := w.Commit(); err != nil {
return err
}
return nil
}
func (s *GoLevelDBStore) Clear() error { func (s *GoLevelDBStore) Clear() error {
s.m.Lock() s.m.Lock()
defer s.m.Unlock() defer s.m.Unlock()

36
wal/log.go
View File

@ -4,19 +4,31 @@ import (
"bytes" "bytes"
"encoding/binary" "encoding/binary"
"io" "io"
"time"
) )
type Log struct { type Log struct {
ID uint64 ID uint64
CreateTime uint32 CreateTime uint32
// 0 for no compression
// 1 for snappy compression Data []byte
Compression uint8 }
Data []byte
func NewLog(id uint64, data []byte) *Log {
l := new(Log)
l.ID = id
l.CreateTime = uint32(time.Now().Unix())
l.Data = data
return l
}
func (l *Log) HeadSize() int {
return 16
} }
func (l *Log) Marshal() ([]byte, error) { func (l *Log) Marshal() ([]byte, error) {
buf := bytes.NewBuffer(make([]byte, 17+len(l.Data))) buf := bytes.NewBuffer(make([]byte, l.HeadSize()+len(l.Data)))
buf.Reset() buf.Reset()
if err := l.Encode(buf); err != nil { if err := l.Encode(buf); err != nil {
@ -33,8 +45,7 @@ func (l *Log) Unmarshal(b []byte) error {
} }
func (l *Log) Encode(w io.Writer) error { func (l *Log) Encode(w io.Writer) error {
length := uint32(17) buf := make([]byte, l.HeadSize())
buf := make([]byte, length)
pos := 0 pos := 0
binary.BigEndian.PutUint64(buf[pos:], l.ID) binary.BigEndian.PutUint64(buf[pos:], l.ID)
@ -43,9 +54,6 @@ func (l *Log) Encode(w io.Writer) error {
binary.BigEndian.PutUint32(buf[pos:], l.CreateTime) binary.BigEndian.PutUint32(buf[pos:], l.CreateTime)
pos += 4 pos += 4
buf[pos] = l.Compression
pos++
binary.BigEndian.PutUint32(buf[pos:], uint32(len(l.Data))) binary.BigEndian.PutUint32(buf[pos:], uint32(len(l.Data)))
if n, err := w.Write(buf); err != nil { if n, err := w.Write(buf); err != nil {
@ -63,8 +71,7 @@ func (l *Log) Encode(w io.Writer) error {
} }
func (l *Log) Decode(r io.Reader) error { func (l *Log) Decode(r io.Reader) error {
length := uint32(17) buf := make([]byte, l.HeadSize())
buf := make([]byte, length)
if _, err := io.ReadFull(r, buf); err != nil { if _, err := io.ReadFull(r, buf); err != nil {
return err return err
@ -77,10 +84,7 @@ func (l *Log) Decode(r io.Reader) error {
l.CreateTime = binary.BigEndian.Uint32(buf[pos:]) l.CreateTime = binary.BigEndian.Uint32(buf[pos:])
pos += 4 pos += 4
l.Compression = buf[pos] length := binary.BigEndian.Uint32(buf[pos:])
pos++
length = binary.BigEndian.Uint32(buf[pos:])
l.Data = make([]byte, length) l.Data = make([]byte, length)
if _, err := io.ReadFull(r, l.Data); err != nil { if _, err := io.ReadFull(r, l.Data); err != nil {

1
wal/log_test.go
View File

@ -36,5 +36,4 @@ func TestLog(t *testing.T) {
if !reflect.DeepEqual(l1, l2) { if !reflect.DeepEqual(l1, l2) {
t.Fatal("must equal") t.Fatal("must equal")
} }
} }

40
wal/store_test.go
View File

@ -4,6 +4,7 @@ import (
"io/ioutil" "io/ioutil"
"os" "os"
"testing" "testing"
"time"
) )
func TestGoLevelDBStore(t *testing.T) { func TestGoLevelDBStore(t *testing.T) {
@ -103,12 +104,12 @@ func testLogs(t *testing.T, l Store) {
} }
// Delete a suffix // Delete a suffix
if err := l.DeleteRange(5, 20); err != nil { if err := l.Purge(5); err != nil {
t.Fatalf("err: %v ", err) t.Fatalf("err: %v ", err)
} }
// Verify they are all deleted // Verify they are all deleted
for i := 5; i <= 20; i++ { for i := 1; i <= 5; i++ {
if err := l.GetLog(uint64(i), &out); err != ErrLogNotFound { if err := l.GetLog(uint64(i), &out); err != ErrLogNotFound {
t.Fatalf("err: %v ", err) t.Fatalf("err: %v ", err)
} }
@ -119,14 +120,14 @@ func testLogs(t *testing.T, l Store) {
if err != nil { if err != nil {
t.Fatalf("err: %v ", err) t.Fatalf("err: %v ", err)
} }
if idx != 1 { if idx != 6 {
t.Fatalf("bad idx: %d", idx) t.Fatalf("bad idx: %d", idx)
} }
idx, err = l.LastID() idx, err = l.LastID()
if err != nil { if err != nil {
t.Fatalf("err: %v ", err) t.Fatalf("err: %v ", err)
} }
if idx != 4 { if idx != 20 {
t.Fatalf("bad idx: %d", idx) t.Fatalf("bad idx: %d", idx)
} }
@ -154,4 +155,35 @@ func testLogs(t *testing.T, l Store) {
if idx != 0 { if idx != 0 {
t.Fatalf("bad idx: %d", idx) t.Fatalf("bad idx: %d", idx)
} }
now := uint32(time.Now().Unix())
logs = []*Log{}
for i := 1; i <= 20; i++ {
nl := &Log{
ID: uint64(i),
CreateTime: now - 20,
Data: []byte("first"),
}
logs = append(logs, nl)
}
if err := l.PurgeExpired(1); err != nil {
t.Fatal(err)
}
idx, err = l.FirstID()
if err != nil {
t.Fatalf("err: %v ", err)
}
if idx != 0 {
t.Fatalf("bad idx: %d", idx)
}
idx, err = l.LastID()
if err != nil {
t.Fatalf("err: %v ", err)
}
if idx != 0 {
t.Fatalf("bad idx: %d", idx)
}
} }

20
wal/wal.go
View File

@ -2,6 +2,8 @@ package wal
import ( import (
"errors" "errors"
"github.com/siddontang/ledisdb/config"
"path"
) )
const ( const (
@ -26,11 +28,25 @@ type Store interface {
StoreLog(log *Log) error StoreLog(log *Log) error
StoreLogs(logs []*Log) error StoreLogs(logs []*Log) error
// Delete logs [start, stop] // Delete first n logs
DeleteRange(start, stop uint64) error Purge(n uint64) error
// Delete logs before n seconds
PurgeExpired(n int) error
// Clear all logs // Clear all logs
Clear() error Clear() error
Close() error Close() error
} }
func NewStore(cfg *config.Config) (Store, error) {
//now we only support goleveldb
base := cfg.WAL.Path
if len(base) == 0 {
base = path.Join(cfg.DataDir, "wal")
}
return NewGoLevelDBStore(base)
}