mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-20 11:33:25 +02:00
313 lines
5.4 KiB
Go
313 lines
5.4 KiB
Go
package nodb
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import (
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"bufio"
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"bytes"
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"errors"
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"io"
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"os"
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"time"
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"github.com/lunny/log"
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"github.com/lunny/nodb/store/driver"
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)
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const (
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maxReplBatchNum = 100
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maxReplLogSize = 1 * 1024 * 1024
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)
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var (
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ErrSkipEvent = errors.New("skip to next event")
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)
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var (
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errInvalidBinLogEvent = errors.New("invalid binglog event")
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errInvalidBinLogFile = errors.New("invalid binlog file")
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)
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type replBatch struct {
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wb driver.IWriteBatch
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events [][]byte
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l *Nodb
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lastHead *BinLogHead
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}
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func (b *replBatch) Commit() error {
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b.l.commitLock.Lock()
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defer b.l.commitLock.Unlock()
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err := b.wb.Commit()
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if err != nil {
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b.Rollback()
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return err
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}
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if b.l.binlog != nil {
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if err = b.l.binlog.Log(b.events...); err != nil {
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b.Rollback()
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return err
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}
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}
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b.events = [][]byte{}
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b.lastHead = nil
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return nil
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}
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func (b *replBatch) Rollback() error {
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b.wb.Rollback()
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b.events = [][]byte{}
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b.lastHead = nil
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return nil
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}
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func (l *Nodb) replicateEvent(b *replBatch, event []byte) error {
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if len(event) == 0 {
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return errInvalidBinLogEvent
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}
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b.events = append(b.events, event)
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logType := uint8(event[0])
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switch logType {
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case BinLogTypePut:
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return l.replicatePutEvent(b, event)
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case BinLogTypeDeletion:
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return l.replicateDeleteEvent(b, event)
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default:
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return errInvalidBinLogEvent
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}
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}
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func (l *Nodb) replicatePutEvent(b *replBatch, event []byte) error {
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key, value, err := decodeBinLogPut(event)
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if err != nil {
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return err
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}
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b.wb.Put(key, value)
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return nil
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}
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func (l *Nodb) replicateDeleteEvent(b *replBatch, event []byte) error {
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key, err := decodeBinLogDelete(event)
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if err != nil {
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return err
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}
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b.wb.Delete(key)
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return nil
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}
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func ReadEventFromReader(rb io.Reader, f func(head *BinLogHead, event []byte) error) error {
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head := &BinLogHead{}
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var err error
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for {
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if err = head.Read(rb); err != nil {
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if err == io.EOF {
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break
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} else {
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return err
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}
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}
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var dataBuf bytes.Buffer
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if _, err = io.CopyN(&dataBuf, rb, int64(head.PayloadLen)); err != nil {
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return err
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}
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err = f(head, dataBuf.Bytes())
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if err != nil && err != ErrSkipEvent {
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return err
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}
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}
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return nil
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}
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func (l *Nodb) ReplicateFromReader(rb io.Reader) error {
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b := new(replBatch)
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b.wb = l.ldb.NewWriteBatch()
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b.l = l
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f := func(head *BinLogHead, event []byte) error {
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if b.lastHead == nil {
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b.lastHead = head
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} else if !b.lastHead.InSameBatch(head) {
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if err := b.Commit(); err != nil {
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log.Fatal("replication error %s, skip to next", err.Error())
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return ErrSkipEvent
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}
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b.lastHead = head
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}
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err := l.replicateEvent(b, event)
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if err != nil {
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log.Fatal("replication error %s, skip to next", err.Error())
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return ErrSkipEvent
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}
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return nil
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}
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err := ReadEventFromReader(rb, f)
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if err != nil {
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b.Rollback()
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return err
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}
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return b.Commit()
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}
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func (l *Nodb) ReplicateFromData(data []byte) error {
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rb := bytes.NewReader(data)
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err := l.ReplicateFromReader(rb)
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return err
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}
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func (l *Nodb) ReplicateFromBinLog(filePath string) error {
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f, err := os.Open(filePath)
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if err != nil {
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return err
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}
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rb := bufio.NewReaderSize(f, 4096)
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err = l.ReplicateFromReader(rb)
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f.Close()
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return err
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}
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// try to read events, if no events read, try to wait the new event singal until timeout seconds
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func (l *Nodb) ReadEventsToTimeout(info *BinLogAnchor, w io.Writer, timeout int) (n int, err error) {
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lastIndex := info.LogFileIndex
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lastPos := info.LogPos
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n = 0
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if l.binlog == nil {
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//binlog not supported
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info.LogFileIndex = 0
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info.LogPos = 0
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return
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}
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n, err = l.ReadEventsTo(info, w)
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if err == nil && info.LogFileIndex == lastIndex && info.LogPos == lastPos {
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//no events read
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select {
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case <-l.binlog.Wait():
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case <-time.After(time.Duration(timeout) * time.Second):
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}
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return l.ReadEventsTo(info, w)
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}
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return
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}
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func (l *Nodb) ReadEventsTo(info *BinLogAnchor, w io.Writer) (n int, err error) {
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n = 0
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if l.binlog == nil {
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//binlog not supported
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info.LogFileIndex = 0
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info.LogPos = 0
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return
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}
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index := info.LogFileIndex
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offset := info.LogPos
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filePath := l.binlog.FormatLogFilePath(index)
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var f *os.File
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f, err = os.Open(filePath)
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if os.IsNotExist(err) {
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lastIndex := l.binlog.LogFileIndex()
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if index == lastIndex {
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//no binlog at all
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info.LogPos = 0
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} else {
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//slave binlog info had lost
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info.LogFileIndex = -1
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}
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}
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if err != nil {
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if os.IsNotExist(err) {
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err = nil
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}
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return
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}
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defer f.Close()
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var fileSize int64
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st, _ := f.Stat()
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fileSize = st.Size()
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if fileSize == info.LogPos {
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return
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}
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if _, err = f.Seek(offset, os.SEEK_SET); err != nil {
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//may be invliad seek offset
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return
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}
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var lastHead *BinLogHead = nil
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head := &BinLogHead{}
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batchNum := 0
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for {
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if err = head.Read(f); err != nil {
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if err == io.EOF {
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//we will try to use next binlog
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if index < l.binlog.LogFileIndex() {
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info.LogFileIndex += 1
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info.LogPos = 0
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}
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err = nil
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return
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} else {
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return
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}
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}
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if lastHead == nil {
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lastHead = head
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batchNum++
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} else if !lastHead.InSameBatch(head) {
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lastHead = head
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batchNum++
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if batchNum > maxReplBatchNum || n > maxReplLogSize {
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return
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}
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}
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if err = head.Write(w); err != nil {
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return
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}
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if _, err = io.CopyN(w, f, int64(head.PayloadLen)); err != nil {
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return
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}
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n += (head.Len() + int(head.PayloadLen))
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info.LogPos = info.LogPos + int64(head.Len()) + int64(head.PayloadLen)
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}
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return
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}
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