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110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
package binlog
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import (
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"encoding/binary"
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"fmt"
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"io"
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"os"
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)
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func innerDumpBinlogFromPos(srcFilePath string, startPos uint, dumpEmptyBinlog bool, targetFilePath string) error {
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tracef("dump binlog from pos : srcFilePath=%v, startPos=%v, targetFilePath=%v", srcFilePath, startPos, targetFilePath)
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srcFile, err := os.Open(srcFilePath)
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if nil != err {
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return err
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}
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defer srcFile.Close()
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stat, err := srcFile.Stat()
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if nil != err {
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return err
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}
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srcFileSize := uint(stat.Size())
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if dumpEmptyBinlog {
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startPos = srcFileSize
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}
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if startPos > srcFileSize {
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return fmt.Errorf("startPos (%v) >= binlog file size (%v)", startPos, srcFileSize)
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}
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emptyFile := startPos == srcFileSize
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headerBs := make([]byte, 19)
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headerEndPos := uint(4)
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for {
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if _, err := srcFile.Seek(int64(headerEndPos), 0); nil != err {
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if "EOF" == err.Error() {
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break
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}
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return err
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}
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if _, err := io.ReadFull(srcFile, headerBs); nil != err {
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if "EOF" == err.Error() {
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break
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}
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return err
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}
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eventType := int(headerBs[4])
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length := binary.LittleEndian.Uint32(headerBs[9:13])
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if FORMAT_DESCRIPTION_EVENT != eventType && ROTATE_EVENT != eventType && PREVIOUS_GTIDS_LOG_EVENT != eventType {
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break
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}
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headerEndPos += uint(length)
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}
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if headerEndPos >= srcFileSize {
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emptyFile = true
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} else if startPos < headerEndPos {
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return fmt.Errorf("dump binlog from startPos (%v) failed, pos < headerEndPos (%v) ", startPos, headerEndPos)
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}
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if target, err := os.Create(targetFilePath); nil != err {
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return err
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} else {
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defer target.Close()
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if _, err := srcFile.Seek(0, 0); nil != err {
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os.Remove(targetFilePath)
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return err
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}
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if _, err := io.CopyN(target, srcFile, int64(headerEndPos)); nil != err {
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os.Remove(targetFilePath)
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return err
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}
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if !emptyFile {
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if _, err := srcFile.Seek(int64(startPos), 0); nil != err {
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os.Remove(targetFilePath)
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return err
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}
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if _, err := io.Copy(target, srcFile); nil != err {
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os.Remove(targetFilePath)
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return err
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}
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}
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}
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return nil
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}
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func DumpBinlogFromPos(srcFilePath string, startPos uint, targetFilePath string) error {
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return innerDumpBinlogFromPos(srcFilePath, startPos, false, targetFilePath)
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}
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func DumpUnexecutedBinlogByGtid(srcFilePath string, executedGtidDesc string, targetFilePath string, includeEventBeforeFirst bool) error {
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pos, err := GetUnexecutedBinlogPosByGtid(srcFilePath, executedGtidDesc, includeEventBeforeFirst)
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if nil != err {
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if "EOF" == err.Error() {
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return innerDumpBinlogFromPos(srcFilePath, 0, true, targetFilePath)
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} else {
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return err
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}
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}
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return innerDumpBinlogFromPos(srcFilePath, pos, false, targetFilePath)
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}
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