86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package themis
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import (
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"bytes"
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"encoding/binary"
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"github.com/ngaut/log"
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"github.com/pingcap/go-hbase"
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)
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type ThemisScanner struct {
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scan *hbase.Scan
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txn *themisTxn
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tbl []byte
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}
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func newThemisScanner(tbl []byte, txn *themisTxn, batchSize int, c hbase.HBaseClient) *ThemisScanner {
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s := hbase.NewScan(tbl, batchSize, c)
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// add start ts
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b := bytes.NewBuffer(nil)
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binary.Write(b, binary.BigEndian, txn.startTs)
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s.AddAttr("_themisTransationStartTs_", b.Bytes())
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return &ThemisScanner{
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scan: s,
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txn: txn,
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tbl: tbl,
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}
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}
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func (s *ThemisScanner) setStartRow(start []byte) {
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s.scan.StartRow = start
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}
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func (s *ThemisScanner) setStopRow(stop []byte) {
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s.scan.StopRow = stop
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}
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func (s *ThemisScanner) SetTimeRange(tsRangeFrom uint64, tsRangeTo uint64) {
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s.scan.TsRangeFrom = tsRangeFrom
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s.scan.TsRangeTo = tsRangeTo
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}
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func (s *ThemisScanner) SetMaxVersions(maxVersions uint32) {
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s.scan.MaxVersions = maxVersions
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}
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func (s *ThemisScanner) createGetFromScan(row []byte) *hbase.Get {
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return s.scan.CreateGetFromScan(row)
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}
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func (s *ThemisScanner) Next() *hbase.ResultRow {
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r := s.scan.Next()
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if r == nil {
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return nil
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}
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// if we encounter conflict locks, we need to clean lock for this row and read again
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if isLockResult(r) {
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g := s.createGetFromScan(r.Row)
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r, err := s.txn.tryToCleanLockAndGetAgain(s.tbl, g, r.SortedColumns)
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if err != nil {
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log.Error(err)
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return nil
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}
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// empty result indicates the current row has been erased, we should get next row
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if r == nil {
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return s.Next()
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} else {
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return r
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}
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}
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return r
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}
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func (s *ThemisScanner) Closed() bool {
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return s.scan.Closed()
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}
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func (s *ThemisScanner) Close() {
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if !s.scan.Closed() {
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// TODO: handle error, now just log
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if err := s.scan.Close(); err != nil {
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log.Warnf("scanner close error, scan: %s, error: %v", s.scan, err)
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}
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}
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}
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