func (ts *Ts) RollBack(savepoint int) error {
var tsr *TsRecord
var ok bool
var rollbacklist ds.List
if ts.tsrList.Len() == 0 {
return err_not_found_ts
}
if savepoint >= ts.curSavePoint {
return err_not_found_savepoint
}
printTsrArray(ts.tsrList)
if savepoint >= 0 {
rollbacklist = ts.subTsrListBySavePoint(savepoint)
} else {
rollbacklist = ts.tsrList
}
printTsrArray(rollbacklist)
printTsrArray(ts.tsrList)
if rollbacklist.Len() == 0 {
return nil
}
for e := rollbacklist.GetTailNode(); e != nil; e = e.Prev {
if tsr, ok = e.Value.(*TsRecord); !ok {
continue
}
ts.rollBackATsr(tsr)
if tsr.Dbptr != nil {
tsr.Dbptr.Lock.Cancel()
}
}
return nil
}
func (dl *TsLog) PutAMeta(
status uint8,
id uint64,
list ds.List,
) *RecordPosition {
if list.Len() == 0 {
return nil
}
buffer := bytes.NewBuffer(nil)
err := binary.Write(buffer, binary.BigEndian, &status)
if err != nil {
return nil
}
err = binary.Write(buffer, binary.BigEndian, &id)
if err != nil {
return nil
}
var tn uint16 = uint16(list.Len())
err = binary.Write(buffer, binary.BigEndian, &tn)
if err != nil {
return nil
}
log.Println("PutAMeta()", dl.metaFile)
isswitchfile := dl.testFileSize(dl.metaFile, int64(dl.metaFileMaxSize))
var wfilen uint16 = uint16(dl.metaFileMaxN)
if isswitchfile {
wfilen++
}
for e := list.GetFirstNode(); e != nil; e = e.Next {
if v, ok := e.Value.(*RecordPosition); ok {
log.Println(v)
err := binary.Write(buffer, binary.BigEndian, &v.FileNo)
if err != nil {
return nil
}
err = binary.Write(buffer, binary.BigEndian, &v.Offset)
if err != nil {
return nil
}
}
}
dl.mutex1.Lock()
defer dl.mutex1.Unlock()
if isswitchfile {
dl.switchMetaFile()
}
log.Println("PutAMeta()", isswitchfile)
offset, err := dl.metaFile.Seek(0, os.SEEK_CUR)
if err != nil {
return nil
}
_, err = dl.metaFile.Write(buffer.Bytes())
if err != nil {
log.Println("PutAMeta()", err)
}
return &RecordPosition{
FileNo: uint16(dl.metaFileMaxN),
Offset: offset,
}
}
func reply(c *Client, msg string, result ds.List) {
defer c.W.Flush()
var resultN int32
if result == nil {
resultN = -1
}
if msg == success {
resultN = 0
if result != nil {
resultN = int32(result.Len())
}
} else {
c.CmdError = true
}
err := binary.Write(c.W, binary.BigEndian, &resultN)
if err != nil {
log.Println("reply()", err)
return
}
if len(msg) == 0 {
log.Println("reply()", "msg len == 0")
return
}
var msgLen uint8 = uint8(len(msg))
err = binary.Write(c.W, binary.BigEndian, &msgLen)
if err != nil {
log.Println("reply()", err)
return
}
c.W.WriteString(msg)
if result == nil || resultN == 0 {
return
}
var objlen uint64
var obj *ds.Object
var ok bool
for e := result.GetFirstNode(); e != nil; e = e.Next {
if obj, ok = e.Value.(*ds.Object); !ok {
continue
}
objlen = uint64(len(obj.GetBuffer()))
if objlen == 0 {
continue
}
err = binary.Write(c.W, binary.BigEndian, &objlen)
if err != nil {
log.Println("reply()", err)
return
}
_, err = c.W.Write(obj.GetBuffer())
if err != nil {
log.Println("reply()", err)
return
}
}
}
func (ts *Ts) subTsrListBySavePoint(savepoint int) ds.List {
var i int = 0
var tsr *TsRecord
var ok bool
var l ds.List = ts.tsrList
for e := l.GetFirstNode(); e != nil; e = e.Next {
if tsr, ok = e.Value.(*TsRecord); !ok {
continue
}
if tsr.Op == SavePoint && savepoint == tsr.SavePointId {
break
}
i++
}
if list := l.SubList(i, l.Len()); list != nil {
for e := list.GetFirstNode(); e != nil; e = e.Next {
l.Remove(e.Value)
}
return list
}
return l
}