91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
package replication
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import (
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"io"
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"os"
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"path"
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"time"
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"github.com/juju/errors"
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. "github.com/siddontang/go-mysql/mysql"
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)
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// Like mysqlbinlog remote raw backup
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// Backup remote binlog from position (filename, offset) and write in backupDir
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func (b *BinlogSyncer) StartBackup(backupDir string, p Position, timeout time.Duration) error {
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if timeout == 0 {
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// a very long timeout here
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timeout = 30 * 3600 * 24 * time.Second
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}
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b.SetRawMode(true)
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os.MkdirAll(backupDir, 0755)
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s, err := b.StartSync(p)
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if err != nil {
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return errors.Trace(err)
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}
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var filename string
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var offset uint32
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var f *os.File
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defer func() {
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if f != nil {
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f.Close()
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}
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}()
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for {
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e, err := s.GetEventTimeout(timeout)
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if errors.Cause(err) == ErrGetEventTimeout {
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// for backward compatibility
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return ErrGetEventTimeout
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} else if err != nil {
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return errors.Trace(err)
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}
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offset = e.Header.LogPos
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if e.Header.EventType == ROTATE_EVENT {
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rotateEvent := e.Event.(*RotateEvent)
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filename = string(rotateEvent.NextLogName)
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if e.Header.Timestamp == 0 || offset == 0 {
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// fake rotate event
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continue
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}
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} else if e.Header.EventType == FORMAT_DESCRIPTION_EVENT {
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// FormateDescriptionEvent is the first event in binlog, we will close old one and create a new
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if f != nil {
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f.Close()
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}
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if len(filename) == 0 {
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return errors.Errorf("empty binlog filename for FormateDescriptionEvent")
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}
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f, err = os.OpenFile(path.Join(backupDir, filename), os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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return errors.Trace(err)
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}
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// write binlog header fe'bin'
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if _, err = f.Write(BinLogFileHeader); err != nil {
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return errors.Trace(err)
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}
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}
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if n, err := f.Write(e.RawData); err != nil {
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return errors.Trace(err)
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} else if n != len(e.RawData) {
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return errors.Trace(io.ErrShortWrite)
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}
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}
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return nil
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}
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