Exemplo n.º 1
0
func (tbl *Table) Scan(req *PkgArgs, au Authorize) []byte {
	var out proto.PkgScanResp
	out.Cmd = req.Cmd
	out.DbId = req.DbId
	out.Seq = req.Seq

	var in proto.PkgScanReq
	n, err := in.Decode(req.Pkg)
	if err != nil || n != len(req.Pkg) {
		return errorHandle(&out, table.EcDecodeFail)
	}

	out.PkgFlag = in.PkgFlag

	if in.DbId == proto.AdminDbId {
		return errorHandle(&out, table.EcInvDbId)
	}

	if !au.IsAuth(in.DbId) {
		return errorHandle(&out, table.EcNoPrivilege)
	}

	if in.ColSpace == proto.ColSpaceScore1 {
		tbl.zScanSortScore(&in, &out)
		return replyHandle(&out)
	}

	var scanColSpace uint8 = proto.ColSpaceDefault
	if in.ColSpace == proto.ColSpaceScore2 {
		scanColSpace = proto.ColSpaceScore2
	}
	var it = tbl.db.NewIterator(nil)
	defer it.Destroy()

	var scanAsc = (in.PkgFlag&proto.FlagScanAsc != 0)
	var startSeek = (in.PkgFlag&proto.FlagScanKeyStart != 0)
	if scanAsc {
		if startSeek {
			// Seek to the first element
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace, in.RowKey, nil))
		} else {
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace,
				in.RowKey, in.ColKey))
		}
	} else {
		if startSeek {
			// Seek to the last element
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace+1, in.RowKey, nil))
		} else {
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace,
				in.RowKey, in.ColKey))
		}
		if !it.Valid() {
			it.SeekToLast()
		}
	}

	out.PkgFlag |= proto.FlagScanEnd
	var first = true
	var scanNum = int(in.Num)
	var pkgLen = proto.HeadSize + 1000
	for i := 0; it.Valid() && i < scanNum+1; iterMove(it, scanAsc) {
		_, dbId, tableId, colSpace, rowKey, colKey := parseRawKey(it.Key())
		if dbId != in.DbId || tableId != in.TableId ||
			colSpace != scanColSpace || bytes.Compare(rowKey, in.RowKey) != 0 {
			if first {
				first = false
				continue
			} else {
				break
			}
		}

		if first {
			first = false
		}

		if !startSeek {
			if scanAsc {
				if bytes.Compare(colKey, in.ColKey) <= 0 {
					continue
				}
			} else {
				if bytes.Compare(colKey, in.ColKey) >= 0 {
					continue
				}
			}
		}

		if i < scanNum {
			var kv proto.KeyValue
			kv.TableId = in.TableId
			kv.RowKey = in.RowKey
			kv.ColKey = colKey
			kv.Value, kv.Score = parseRawValue(it.Value())
			if len(kv.Value) > 0 {
				kv.CtrlFlag |= proto.CtrlValue
			}
			if kv.Score != 0 {
				kv.CtrlFlag |= proto.CtrlScore
			}

			out.Kvs = append(out.Kvs, kv)

			pkgLen += kv.Length()
			if pkgLen > proto.MaxPkgLen/2 {
				out.PkgFlag &^= proto.FlagScanEnd
				break
			}
		} else {
			out.PkgFlag &^= proto.FlagScanEnd
			break
		}
		i++
	}

	return replyHandle(&out)
}
Exemplo n.º 2
0
func (tbl *Table) zScanSortScore(in *proto.PkgScanReq, out *proto.PkgScanResp) {
	var it = tbl.db.NewIterator(nil)
	defer it.Destroy()

	var scanAsc = (in.PkgFlag&proto.FlagScanAsc != 0)
	var startSeek = (in.PkgFlag&proto.FlagScanKeyStart != 0)
	var scanColSpace uint8 = proto.ColSpaceScore1
	if scanAsc {
		if startSeek {
			// Seek to the first element
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace,
				in.RowKey, nil))
		} else {
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace,
				in.RowKey, newScoreColKey(in.Score, in.ColKey)))
		}
	} else {
		if startSeek {
			// Seek to the last element
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace+1,
				in.RowKey, nil))
		} else {
			it.Seek(getRawKey(in.DbId, in.TableId, scanColSpace,
				in.RowKey, newScoreColKey(in.Score, in.ColKey)))
		}
		if !it.Valid() {
			it.SeekToLast()
		}
	}

	out.PkgFlag |= proto.FlagScanEnd
	var first = true
	var scanNum = int(in.Num)
	var pkgLen = proto.HeadSize + 1000
	for i := 0; it.Valid() && i < scanNum+1; iterMove(it, scanAsc) {
		_, dbId, tableId, colSpace, rowKey, colKey := parseRawKey(it.Key())
		if dbId != in.DbId || tableId != in.TableId ||
			colSpace != scanColSpace || bytes.Compare(rowKey, in.RowKey) != 0 {
			if first {
				first = false
				continue
			} else {
				break
			}
		}

		if first {
			first = false
		}

		if len(colKey) < 8 {
			continue //  skip invalid record
		}
		zColKey, zScore := parseZColKey(colKey)
		if !startSeek {
			if scanAsc {
				if zScore < in.Score {
					continue
				}
				if zScore == in.Score && bytes.Compare(zColKey, in.ColKey) <= 0 {
					continue
				}
			} else {
				if zScore > in.Score {
					continue
				}
				if zScore == in.Score && bytes.Compare(zColKey, in.ColKey) >= 0 {
					continue
				}
			}
		}

		if i < scanNum {
			var kv proto.KeyValue
			kv.TableId = in.TableId
			kv.RowKey = in.RowKey
			kv.ColKey = zColKey
			kv.Value, _ = parseRawValue(it.Value())
			kv.Score = zScore
			if len(kv.Value) > 0 {
				kv.CtrlFlag |= proto.CtrlValue
			}
			if kv.Score != 0 {
				kv.CtrlFlag |= proto.CtrlScore
			}
			out.Kvs = append(out.Kvs, kv)

			pkgLen += kv.Length()
			if pkgLen > proto.MaxPkgLen/2 {
				out.PkgFlag &^= proto.FlagScanEnd
				break
			}
		} else {
			out.PkgFlag &^= proto.FlagScanEnd
			break
		}
		i++
	}
}