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Remove unused functions in binlog_file.go #1605

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Remove unused functions in binlog_file.go #1605

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53 changes: 0 additions & 53 deletions go/mysql/binlog_file.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,19 +7,11 @@
package mysql

import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
)

var detachPattern *regexp.Regexp

func init() {
detachPattern, _ = regexp.Compile(`//([^/:]+):([\d]+)`) // e.g. `//binlog.01234:567890`
}

// FileBinlogCoordinates described binary log coordinates in the form of a binlog file & log position.
type FileBinlogCoordinates struct {
LogFile string
Expand Down Expand Up @@ -120,51 +112,6 @@ func (this *FileBinlogCoordinates) FileNumber() (int, int) {
return fileNum, numLen
}

// PreviousFileCoordinatesBy guesses the filename of the previous binlog/relaylog, by given offset (number of files back)
func (this *FileBinlogCoordinates) PreviousFileCoordinatesBy(offset int) (BinlogCoordinates, error) {
result := &FileBinlogCoordinates{}

fileNum, numLen := this.FileNumber()
if fileNum == 0 {
return result, errors.New("Log file number is zero, cannot detect previous file")
}
newNumStr := fmt.Sprintf("%d", (fileNum - offset))
newNumStr = strings.Repeat("0", numLen-len(newNumStr)) + newNumStr

tokens := strings.Split(this.LogFile, ".")
tokens[len(tokens)-1] = newNumStr
result.LogFile = strings.Join(tokens, ".")
return result, nil
}

// PreviousFileCoordinates guesses the filename of the previous binlog/relaylog
func (this *FileBinlogCoordinates) PreviousFileCoordinates() (BinlogCoordinates, error) {
return this.PreviousFileCoordinatesBy(1)
}

// PreviousFileCoordinates guesses the filename of the previous binlog/relaylog
func (this *FileBinlogCoordinates) NextFileCoordinates() (BinlogCoordinates, error) {
result := &FileBinlogCoordinates{}

fileNum, numLen := this.FileNumber()
newNumStr := fmt.Sprintf("%d", (fileNum + 1))
newNumStr = strings.Repeat("0", numLen-len(newNumStr)) + newNumStr

tokens := strings.Split(this.LogFile, ".")
tokens[len(tokens)-1] = newNumStr
result.LogFile = strings.Join(tokens, ".")
return result, nil
}

// FileSmallerThan returns true if this coordinate's file is strictly smaller than the other's.
func (this *FileBinlogCoordinates) DetachedCoordinates() (isDetached bool, detachedLogFile string, detachedLogPos string) {
detachedCoordinatesSubmatch := detachPattern.FindStringSubmatch(this.LogFile)
if len(detachedCoordinatesSubmatch) == 0 {
return false, "", ""
}
return true, detachedCoordinatesSubmatch[1], detachedCoordinatesSubmatch[2]
}

func (this *FileBinlogCoordinates) Clone() BinlogCoordinates {
return &FileBinlogCoordinates{
LogPos: this.LogPos,
Expand Down
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