bin log and relay log use same log

This commit is contained in:
siddontang 2014-06-03 14:08:57 +08:00
parent 8cc62ad89f
commit 263a89b9aa
6 changed files with 401 additions and 231 deletions

View File

@ -33,7 +33,7 @@ type Ledis struct {
ldb *leveldb.DB
dbs [MaxDBNumber]*DB
binlog *replication.BinLog
binlog *replication.Log
}
func Open(configJson json.RawMessage) (*Ledis, error) {

View File

@ -12,7 +12,7 @@ type tx struct {
l *Ledis
wb *leveldb.WriteBatch
binlog *replication.BinLog
binlog *replication.Log
batch [][]byte
}

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@ -4,13 +4,6 @@ import (
"bufio"
"encoding/binary"
"encoding/json"
"fmt"
"github.com/siddontang/go-log/log"
"io"
"os"
"path"
"strconv"
"strings"
"time"
)
@ -35,11 +28,7 @@ timestamp(bigendian uint32, seconds)|PayloadLen(bigendian uint32)|PayloadData|Lo
*/
type BinLogConfig struct {
BaseName string `json:"base_name"`
IndexName string `json:"index_name"`
Path string `json:"path"`
MaxFileSize int `json:"max_file_size"`
MaxFileNum int `json:"max_file_num"`
LogConfig
}
func (cfg *BinLogConfig) adjust() {
@ -61,21 +50,35 @@ func (cfg *BinLogConfig) adjust() {
if len(cfg.IndexName) == 0 {
cfg.IndexName = "ledis"
}
cfg.SpaceLimit = -1
cfg.LogType = "bin"
}
type BinLog struct {
cfg *BinLogConfig
logFile *os.File
logWb *bufio.Writer
indexName string
logNames []string
lastLogIndex int
type binlogHandler struct {
}
func NewBinLog(data json.RawMessage) (*BinLog, error) {
func (h *binlogHandler) Write(wb *bufio.Writer, data []byte) (int, error) {
createTime := uint32(time.Now().Unix())
payLoadLen := uint32(len(data))
if err := binary.Write(wb, binary.BigEndian, createTime); err != nil {
return 0, err
}
if err := binary.Write(wb, binary.BigEndian, payLoadLen); err != nil {
return 0, err
}
if _, err := wb.Write(data); err != nil {
return 0, err
}
return 8 + len(data), nil
}
func NewBinLog(data json.RawMessage) (*Log, error) {
var cfg BinLogConfig
if err := json.Unmarshal(data, &cfg); err != nil {
@ -85,211 +88,8 @@ func NewBinLog(data json.RawMessage) (*BinLog, error) {
return NewBinLogWithConfig(&cfg)
}
func NewBinLogWithConfig(cfg *BinLogConfig) (*BinLog, error) {
b := new(BinLog)
func NewBinLogWithConfig(cfg *BinLogConfig) (*Log, error) {
cfg.adjust()
b.cfg = cfg
if err := os.MkdirAll(cfg.Path, os.ModePerm); err != nil {
return nil, err
}
b.logNames = make([]string, 0, b.cfg.MaxFileNum)
if err := b.loadIndex(); err != nil {
return nil, err
}
return b, nil
}
func (b *BinLog) Close() {
if b.logFile != nil {
b.logFile.Close()
}
}
func (b *BinLog) deleteOldest() {
logPath := path.Join(b.cfg.Path, b.logNames[0])
os.Remove(logPath)
copy(b.logNames[0:], b.logNames[1:])
b.logNames = b.logNames[0 : len(b.logNames)-1]
}
func (b *BinLog) flushIndex() error {
data := strings.Join(b.logNames, "\n")
bakName := fmt.Sprintf("%s.bak", b.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, b.indexName); err != nil {
log.Error("rename binlog bak index error %s", err.Error())
return err
}
return nil
}
func (b *BinLog) loadIndex() error {
b.indexName = path.Join(b.cfg.Path, fmt.Sprintf("%s-bin.index", b.cfg.IndexName))
fd, err := os.OpenFile(b.indexName, os.O_CREATE|os.O_RDWR, 0666)
if err != nil {
return err
}
//maybe we will check valid later?
rb := bufio.NewReader(fd)
for {
line, err := rb.ReadString('\n')
if err != nil && err != io.EOF {
fd.Close()
return err
}
line = strings.Trim(line, "\r\n ")
if len(line) > 0 {
b.logNames = append(b.logNames, line)
}
if len(b.logNames) == b.cfg.MaxFileNum {
//remove oldest logfile
b.deleteOldest()
}
if err == io.EOF {
break
}
}
fd.Close()
if err := b.flushIndex(); err != nil {
return err
}
if len(b.logNames) == 0 {
b.lastLogIndex = 1
} else {
lastName := b.logNames[len(b.logNames)-1]
if b.lastLogIndex, err = strconv.Atoi(path.Ext(lastName)[1:]); err != nil {
log.Error("invalid logfile name %s", err.Error())
return err
}
//like mysql, if server restart, a new binlog will create
b.lastLogIndex++
}
return nil
}
func (b *BinLog) getLogName() string {
return fmt.Sprintf("%s-bin.%05d", b.cfg.BaseName, b.lastLogIndex)
}
func (b *BinLog) openNewLogFile() error {
var err error
lastName := b.getLogName()
logPath := path.Join(b.cfg.Path, lastName)
if b.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 len(b.logNames) == b.cfg.MaxFileNum {
b.deleteOldest()
}
b.logNames = append(b.logNames, lastName)
if b.logWb == nil {
b.logWb = bufio.NewWriterSize(b.logFile, 1024)
} else {
b.logWb.Reset(b.logFile)
}
if err = b.flushIndex(); err != nil {
return err
}
return nil
}
func (b *BinLog) openLogFile() error {
if b.logFile == nil {
return b.openNewLogFile()
} else {
//check file size
st, _ := b.logFile.Stat()
if st.Size() >= int64(b.cfg.MaxFileSize) {
//must use new file
b.lastLogIndex++
b.logFile.Close()
return b.openNewLogFile()
}
}
return nil
}
func (b *BinLog) Log(args ...[]byte) error {
var err error
if err = b.openLogFile(); err != nil {
return err
}
for _, data := range args {
createTime := uint32(time.Now().Unix())
payLoadLen := len(data)
binary.Write(b.logWb, binary.BigEndian, createTime)
binary.Write(b.logWb, binary.BigEndian, payLoadLen)
b.logWb.Write(data)
if err = b.logWb.Flush(); err != nil {
log.Error("write log error %s", err.Error())
return err
}
}
return nil
}
func (b *BinLog) LogFileName() string {
if len(b.logNames) == 0 {
return ""
} else {
return b.logNames[len(b.logNames)-1]
}
}
func (b *BinLog) LogFilePos() int64 {
if b.logFile == nil {
return 0
} else {
st, _ := b.logFile.Stat()
return st.Size()
}
return newLog(new(binlogHandler), &cfg.LogConfig)
}

287
replication/log.go Normal file
View File

@ -0,0 +1,287 @@
package replication
import (
"bufio"
"errors"
"fmt"
"github.com/siddontang/go-log/log"
"io/ioutil"
"os"
"path"
"strconv"
"strings"
)
var (
ErrOverSpaceLimit = errors.New("total log files exceed space limit")
)
type logHandler interface {
Write(wb *bufio.Writer, data []byte) (int, error)
}
type LogConfig struct {
BaseName string `json:"base_name"`
IndexName string `json:"index_name"`
LogType string `json:"log_type"`
Path string `json:"path"`
MaxFileSize int `json:"max_file_size"`
MaxFileNum int `json:"max_file_num"`
SpaceLimit int64 `json:"space_limit"`
}
type Log struct {
cfg *LogConfig
logFile *os.File
logWb *bufio.Writer
indexName string
logNames []string
lastLogIndex int
space int64
handler logHandler
}
func newLog(handler logHandler, cfg *LogConfig) (*Log, error) {
l := new(Log)
l.cfg = cfg
l.handler = handler
if err := os.MkdirAll(cfg.Path, os.ModePerm); err != nil {
return nil, err
}
l.logNames = make([]string, 0, 16)
l.space = 0
if err := l.loadIndex(); err != nil {
return nil, err
}
return l, nil
}
func (l *Log) 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 *Log) loadIndex() error {
l.indexName = path.Join(l.cfg.Path, fmt.Sprintf("%s-%s.index", l.cfg.IndexName, l.cfg.LogType))
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 st, err := os.Stat(path.Join(l.cfg.Path, line)); err != nil {
log.Error("load index line %s error %s", line, err.Error())
return err
} else {
l.space += st.Size()
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.Atoi(path.Ext(lastName)[1:]); 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 *Log) getLogFile() string {
return fmt.Sprintf("%s-%s.%05d", l.cfg.BaseName, l.cfg.LogType, l.lastLogIndex)
}
func (l *Log) openNewLogFile() error {
var err error
lastName := l.getLogFile()
logPath := path.Join(l.cfg.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 *Log) checkLogFileSize() bool {
if l.logFile == nil {
return false
}
st, _ := l.logFile.Stat()
if st.Size() >= int64(l.cfg.MaxFileSize) {
l.lastLogIndex++
l.logFile.Close()
l.logFile = nil
return true
}
return false
}
func (l *Log) purge(n int) {
for i := 0; i < n; i++ {
logPath := path.Join(l.cfg.Path, l.logNames[i])
if st, err := os.Stat(logPath); err != nil {
log.Error("purge %s error %s", logPath, err.Error())
} else {
l.space -= st.Size()
}
os.Remove(logPath)
}
copy(l.logNames[0:], l.logNames[n:])
l.logNames = l.logNames[0 : len(l.logNames)-n]
}
func (l *Log) Close() {
if l.logFile != nil {
l.logFile.Close()
l.logFile = nil
}
}
func (l *Log) LogFileName() string {
return l.getLogFile()
}
func (l *Log) LogFilePos() int64 {
if l.logFile == nil {
return 0
} else {
st, _ := l.logFile.Stat()
return st.Size()
}
}
func (l *Log) Purge(n int) error {
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 *Log) Log(args ...[]byte) error {
if l.cfg.SpaceLimit > 0 && l.space >= l.cfg.SpaceLimit {
return ErrOverSpaceLimit
}
var err error
if l.logFile == nil {
if err = l.openNewLogFile(); err != nil {
return err
}
}
totalSize := 0
var n int = 0
for _, data := range args {
if n, err = l.handler.Write(l.logWb, data); err != nil {
log.Error("write log error %s", err.Error())
return err
} else {
totalSize += n
}
}
if err = l.logWb.Flush(); err != nil {
log.Error("write log error %s", err.Error())
return err
}
l.space += int64(totalSize)
l.checkLogFileSize()
return nil
}

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@ -1,4 +1,56 @@
package replication
type RelayLog struct {
import (
"bufio"
"encoding/json"
)
const (
MaxRelayLogFileSize int = 1024 * 1024 * 1024
DefaultRelayLogFileSize int = MaxRelayLogFileSize
)
type RelayLogConfig struct {
LogConfig
}
func (cfg *RelayLogConfig) adjust() {
if cfg.MaxFileSize <= 0 {
cfg.MaxFileSize = DefaultRelayLogFileSize
} else if cfg.MaxFileSize > MaxRelayLogFileSize {
cfg.MaxFileSize = MaxRelayLogFileSize
}
if len(cfg.BaseName) == 0 {
cfg.BaseName = "ledis"
}
if len(cfg.IndexName) == 0 {
cfg.IndexName = "ledis"
}
cfg.MaxFileNum = -1
cfg.LogType = "relay"
}
type relayLogHandler struct {
}
func (h *relayLogHandler) Write(wb *bufio.Writer, data []byte) (int, error) {
return wb.Write(data)
}
func NewRelayLog(data json.RawMessage) (*Log, error) {
var cfg RelayLogConfig
if err := json.Unmarshal(data, &cfg); err != nil {
return nil, err
}
return NewRelayLogWithConfig(&cfg)
}
func NewRelayLogWithConfig(cfg *RelayLogConfig) (*Log, error) {
cfg.adjust()
return newLog(new(relayLogHandler), &cfg.LogConfig)
}

View File

@ -1,9 +1,40 @@
package replication
import (
"os"
"testing"
)
func TestRelayLog(t *testing.T) {
cfg := new(RelayLogConfig)
cfg.MaxFileSize = 1024
cfg.SpaceLimit = 1024
cfg.Path = "/tmp/ledis_relaylog"
os.RemoveAll(cfg.Path)
b, err := NewRelayLogWithConfig(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, 1)); err == nil {
t.Fatal("must not nil")
} else if err != ErrOverSpaceLimit {
t.Fatal(err)
}
if err := b.Purge(1); err != nil {
t.Fatal(err)
}
if err := b.Log(make([]byte, 1)); err != nil {
t.Fatal(err)
}
}