forked from mirror/ledisdb
609 lines
12 KiB
Go
609 lines
12 KiB
Go
package ledis
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import (
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"encoding/binary"
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"errors"
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"github.com/siddontang/ledisdb/leveldb"
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)
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const (
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OPand uint8 = iota + 1
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OPor
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OPxor
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OPnot
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)
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const (
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// byte
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segByteWidth uint32 = 9
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segByteSize uint32 = 1 << segByteWidth
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// bit
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segBitWidth uint32 = segByteWidth + 3
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segBitSize uint32 = segByteSize << 3
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maxByteSize uint32 = 8 << 20
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maxSegCount uint32 = maxByteSize / segByteSize
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minSeq uint32 = 0
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maxSeq uint32 = uint32((maxByteSize << 3) - 1)
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)
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var bitsInByte = [256]int32{0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3,
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4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3,
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3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4,
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5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4,
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3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4,
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5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2,
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2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3,
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4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4,
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5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6,
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6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5,
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6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8}
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var fillSegment []byte = func() []byte {
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data := make([]byte, segByteSize, segByteSize)
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for i := uint32(0); i < segByteSize; i++ {
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data[i] = 0xff
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}
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return data
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}()
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var errBinKey = errors.New("invalid bin key")
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var errOffset = errors.New("invalid offset")
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func getBit(sz []byte, offset uint32) uint8 {
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index := offset >> 3
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if index >= uint32(len(sz)) {
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return 0 // error("overflow")
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}
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offset -= index << 3
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return sz[index] >> offset & 1
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}
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func setBit(sz []byte, offset uint32, val uint8) bool {
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if val != 1 && val != 0 {
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return false // error("invalid val")
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}
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index := offset >> 3
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if index >= uint32(len(sz)) {
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return false // error("overflow")
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}
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offset -= index << 3
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if sz[index]>>offset&1 != val {
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sz[index] ^= (1 << offset)
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}
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return true
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}
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func (db *DB) bEncodeMetaKey(key []byte) []byte {
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mk := make([]byte, len(key)+2)
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mk[0] = db.index
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mk[1] = binMetaType
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copy(mk, key)
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return mk
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}
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func (db *DB) bEncodeBinKey(key []byte, seq uint32) []byte {
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bk := make([]byte, len(key)+8)
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pos := 0
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bk[pos] = db.index
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pos++
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bk[pos] = binType
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pos++
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binary.BigEndian.PutUint16(bk[pos:], uint16(len(key)))
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pos += 2
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copy(bk[pos:], key)
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pos += len(key)
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binary.BigEndian.PutUint32(bk[pos:], seq)
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return bk
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}
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func (db *DB) bDecodeBinKey(bkey []byte) (key []byte, seq uint32, err error) {
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if len(bkey) < 8 || bkey[0] != db.index {
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err = errBinKey
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return
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}
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keyLen := binary.BigEndian.Uint16(bkey[2:4])
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if int(keyLen+8) != len(bkey) {
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err = errBinKey
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return
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}
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key = bkey[4 : 4+keyLen]
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seq = uint32(binary.BigEndian.Uint32(bkey[4+keyLen:]))
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return
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}
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func (db *DB) bCapByteSize(seq uint32, off uint32) uint32 {
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var offByteSize uint32 = (off >> 3) + 1
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if offByteSize > segByteSize {
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offByteSize = segByteSize
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}
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return seq<<segByteWidth + offByteSize
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}
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func (db *DB) bParseOffset(key []byte, offset int32) (seq uint32, off uint32, err error) {
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if offset < 0 {
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if tailSeq, tailOff, e := db.bGetMeta(key); e != nil {
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err = e
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return
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} else if tailSeq >= 0 {
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offset += int32(uint32(tailSeq)<<segBitWidth | uint32(tailOff))
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if offset < 0 {
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err = errOffset
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return
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}
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}
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}
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off = uint32(offset)
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seq = off >> segBitWidth
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off &= (segBitSize - 1)
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return
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}
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func (db *DB) bGetMeta(key []byte) (tailSeq int32, tailOff int32, err error) {
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var v []byte
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mk := db.bEncodeMetaKey(key)
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v, err = db.db.Get(mk)
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if err != nil {
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return
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}
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if v != nil {
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tailSeq = int32(binary.LittleEndian.Uint32(v[0:4]))
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tailOff = int32(binary.LittleEndian.Uint32(v[4:8]))
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} else {
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tailSeq = -1
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tailOff = -1
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}
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return
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}
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func (db *DB) bSetMeta(t *tx, key []byte, tailSeq uint32, tailOff uint32) {
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ek := db.bEncodeMetaKey(key)
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// todo ..
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// if size == 0 // headSeq == tailSeq
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// t.Delete(ek)
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buf := make([]byte, 8)
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binary.LittleEndian.PutUint32(buf[0:4], tailSeq)
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binary.LittleEndian.PutUint32(buf[4:8], tailOff)
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t.Put(ek, buf)
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return
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}
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func (db *DB) bUpdateMeta(t *tx, key []byte, seq uint32, off uint32) (tailSeq uint32, tailOff uint32, err error) {
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var ts, to int32
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if ts, to, err = db.bGetMeta(key); err != nil {
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return
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} else {
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tailSeq = uint32(MaxInt32(ts, 0))
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tailOff = uint32(MaxInt32(to, 0))
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}
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if seq > tailSeq || (seq == tailSeq && off > tailOff) {
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db.bSetMeta(t, key, seq, off)
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tailSeq = seq
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tailOff = off
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}
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return
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}
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func (db *DB) bDelete(t *tx, key []byte) (drop int64) {
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mk := db.bEncodeMetaKey(key)
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t.Delete(mk)
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minKey := db.bEncodeBinKey(key, minSeq)
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maxKey := db.bEncodeBinKey(key, maxSeq)
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it := db.db.RangeIterator(minKey, maxKey, leveldb.RangeClose)
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for ; it.Valid(); it.Next() {
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t.Delete(it.Key())
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drop = 1
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}
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it.Close()
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return drop
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}
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func (db *DB) BGet(key []byte) (data []byte, err error) {
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if err = checkKeySize(key); err != nil {
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return
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}
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var ts, to int32
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if ts, to, err = db.bGetMeta(key); err != nil || ts < 0 {
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return
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}
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var tailSeq, tailOff = uint32(ts), uint32(to)
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var capByteSize uint32 = db.bCapByteSize(tailSeq, tailOff)
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data = make([]byte, capByteSize, capByteSize)
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minKey := db.bEncodeBinKey(key, minSeq)
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maxKey := db.bEncodeBinKey(key, tailSeq)
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it := db.db.RangeIterator(minKey, maxKey, leveldb.RangeClose)
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var seq, s, e uint32
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for ; it.Valid(); it.Next() {
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if _, seq, err = db.bDecodeBinKey(it.Key()); err != nil {
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data = nil
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break
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}
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s = seq << segByteWidth
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e = MinUInt32(s+segByteSize, capByteSize)
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copy(data[s:e], it.Value())
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}
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it.Close()
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return
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}
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func (db *DB) BDelete(key []byte) (drop int64, err error) {
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if err = checkKeySize(key); err != nil {
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return
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}
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t := db.binTx
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t.Lock()
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defer t.Unlock()
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drop = db.bDelete(t, key)
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db.rmExpire(t, bExpType, key)
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err = t.Commit()
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return
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}
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func (db *DB) getSegment(key []byte, seq uint32) ([]byte, []byte, error) {
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bk := db.bEncodeBinKey(key, seq)
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segment, err := db.db.Get(bk)
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if err != nil {
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return bk, nil, err
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}
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return bk, segment, nil
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}
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func (db *DB) allocateSegment(key []byte, seq uint32) ([]byte, []byte, error) {
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bk, segment, err := db.getSegment(key, seq)
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if err == nil && segment == nil {
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segment = make([]byte, segByteSize, segByteSize) // can be optimize ?
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}
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return bk, segment, err
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}
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func (db *DB) BSetBit(key []byte, offset int32, val uint8) (ori uint8, err error) {
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if err = checkKeySize(key); err != nil {
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return
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}
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// todo : check offset
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var seq, off uint32
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if seq, off, err = db.bParseOffset(key, offset); err != nil {
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return 0, err
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}
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var bk, segment []byte
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if bk, segment, err = db.allocateSegment(key, seq); err != nil {
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return 0, err
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}
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if segment != nil {
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ori = getBit(segment, off)
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setBit(segment, off, val)
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t := db.binTx
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t.Lock()
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t.Put(bk, segment)
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if _, _, e := db.bUpdateMeta(t, key, seq, off); e != nil {
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err = e
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return
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}
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err = t.Commit()
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t.Unlock()
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}
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return
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}
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func (db *DB) BGetBit(key []byte, offset int32) (uint8, error) {
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if seq, off, err := db.bParseOffset(key, offset); err != nil {
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return 0, err
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} else {
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_, segment, err := db.getSegment(key, seq)
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if err != nil {
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return 0, err
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}
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if segment == nil {
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return 0, nil
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} else {
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return getBit(segment, off), nil
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}
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}
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}
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// func (db *DB) BGetRange(key []byte, start int32, end int32) ([]byte, error) {
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// section := make([]byte)
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// return
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// }
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func (db *DB) BCount(key []byte, start int32, end int32) (cnt int32, err error) {
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var sseq uint32
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if sseq, _, err = db.bParseOffset(key, start); err != nil {
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return
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}
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var eseq uint32
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if eseq, _, err = db.bParseOffset(key, end); err != nil {
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return
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}
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var segment []byte
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skey := db.bEncodeBinKey(key, sseq)
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ekey := db.bEncodeBinKey(key, eseq)
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it := db.db.RangeIterator(skey, ekey, leveldb.RangeClose)
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for ; it.Valid(); it.Next() {
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segment = it.Value()
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for _, bit := range segment {
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cnt += bitsInByte[bit]
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}
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}
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it.Close()
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return
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}
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func (db *DB) BTail(key []byte) (int32, error) {
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// effective length of data, the highest bit-pos set in history
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tailSeq, tailOff, err := db.bGetMeta(key)
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if err != nil {
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return 0, err
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}
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tail := int32(-1)
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if tailSeq >= 0 {
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tail = int32(uint32(tailSeq)<<segBitWidth | uint32(tailOff))
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}
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return tail, nil
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}
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func (db *DB) bSegAnd(a []byte, b []byte, res *[]byte) {
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if a == nil || b == nil {
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*res = nil
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return
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}
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data := *res
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if data == nil {
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data = make([]byte, segByteSize, segByteSize)
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*res = data
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}
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for i := uint32(0); i < segByteSize; i++ {
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data[i] = a[i] & b[i]
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}
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return
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}
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func (db *DB) bSegOr(a []byte, b []byte, res *[]byte) {
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if a == nil || b == nil {
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if a == nil && b == nil {
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*res = nil
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} else if a == nil {
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*res = b
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} else {
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*res = a
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}
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return
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}
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data := *res
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if data == nil {
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data = make([]byte, segByteSize, segByteSize)
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*res = data
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}
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for i := uint32(0); i < segByteSize; i++ {
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data[i] = a[i] | b[i]
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}
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return
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}
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func (db *DB) bIterator(key []byte) *leveldb.RangeLimitIterator {
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sk := db.bEncodeBinKey(key, minSeq)
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ek := db.bEncodeBinKey(key, maxSeq)
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return db.db.RangeIterator(sk, ek, leveldb.RangeClose)
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}
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func (db *DB) BOperation(op uint8, dstkey []byte, srckeys ...[]byte) (blen int32, err error) {
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// return :
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// The size of the string stored in the destination key,
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// that is equal to the size of the longest input string.
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var exeOp func([]byte, []byte, *[]byte)
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switch op {
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case OPand:
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exeOp = db.bSegAnd
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case OPor:
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exeOp = db.bSegOr
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default:
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return
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}
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if dstkey == nil || srckeys == nil || len(srckeys) == 0 {
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return
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}
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blen = -1
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t := db.binTx
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t.Lock()
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defer t.Unlock()
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// init - meta info
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var maxDstSeq, maxDstOff uint32
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var nowSeq, nowOff int32
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var keyNum int = len(srckeys)
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var iniIdx int = 0
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for ; iniIdx < keyNum; iniIdx++ {
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if nowSeq, nowOff, err = db.bGetMeta(srckeys[iniIdx]); err != nil { // todo : if key not exists ....
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return
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}
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if nowSeq >= 0 {
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maxDstSeq = uint32(nowSeq)
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maxDstOff = uint32(nowOff)
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break
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}
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}
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if iniIdx+1 >= keyNum { // todo ... while operation is 'not'
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// msg("lack of arguments")
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return
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}
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// init - data
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var seq, off uint32
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var segments = make([][]byte, maxSegCount) // todo : init count also can be optimize while 'and' / 'or'
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it := db.bIterator(srckeys[iniIdx])
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for ; it.Valid(); it.Next() {
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if _, seq, err = db.bDecodeBinKey(it.Key()); err != nil {
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// to do ...
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it.Close()
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return
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}
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segments[seq] = it.Value()
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}
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it.Close()
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// operation with following keys
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for i := iniIdx + 1; i < keyNum; i++ {
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if nowSeq, nowOff, err = db.bGetMeta(srckeys[i]); err != nil {
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return
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}
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if nowSeq < 0 {
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continue
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} else {
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seq = uint32(nowSeq)
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off = uint32(nowOff)
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if seq > maxDstSeq || (seq == maxDstSeq && off > maxDstOff) {
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maxDstSeq = seq
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maxDstOff = off
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}
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}
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it = db.bIterator(srckeys[i])
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segIdx := uint32(0)
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for end := false; !end; it.Next() {
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end = !it.Valid()
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if !end {
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if _, seq, err = db.bDecodeBinKey(it.Key()); err != nil {
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// to do ...
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it.Close()
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return
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}
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} else {
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seq = maxSegCount
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}
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// todo :
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// operation 'and' can be optimize here :
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// if seq > max_segments_idx, this loop can be break,
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// which can avoid cost from Key() and decode key
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if op == OPand || op == OPor {
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for ; segIdx < seq; segIdx++ {
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if segments[segIdx] != nil {
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exeOp(segments[segIdx], nil, &segments[segIdx])
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}
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|
}
|
|
} // else {...}
|
|
|
|
if !end {
|
|
exeOp(segments[seq], it.Value(), &segments[segIdx])
|
|
segIdx++
|
|
}
|
|
}
|
|
it.Close()
|
|
}
|
|
|
|
// clear the old data in case
|
|
db.bDelete(t, dstkey)
|
|
db.rmExpire(t, bExpType, dstkey)
|
|
|
|
// set data and meta
|
|
// if op == OPand || op == OPor {
|
|
// for i := maxDstSeq; i >= 0; i-- {
|
|
//
|
|
// }
|
|
// }
|
|
db.bSetMeta(t, dstkey, maxDstSeq, maxDstOff)
|
|
|
|
var bk []byte
|
|
for seq, seg := range segments {
|
|
if seg != nil {
|
|
// todo:
|
|
// here can be optimize, like 'updateBinKeySeq',
|
|
// avoid too many make mem
|
|
bk = db.bEncodeBinKey(dstkey, uint32(seq))
|
|
t.Put(bk, seg)
|
|
}
|
|
}
|
|
|
|
err = t.Commit()
|
|
if err != nil {
|
|
blen = int32(maxDstSeq<<segBitWidth | maxDstOff)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// func (db *DB) BExpire(key []byte, duration int64) (int64, error) {
|
|
|
|
// }
|
|
|
|
// func (db *DB) BExpireAt(key []byte, when int64) (int64, error) {
|
|
|
|
// }
|
|
|
|
// func (db *DB) BTTL(key []byte) (int64, error) {
|
|
|
|
// }
|
|
|
|
// func (db *DB) BPersist(key []byte) (int64, error) {
|
|
|
|
// }
|
|
|
|
// func (db *DB) BScan(key []byte, count int, inclusive bool) ([]KVPair, error) {
|
|
|
|
// }
|
|
|
|
// func (db *DB) bFlush() (drop int64, err error) {
|
|
|
|
// }
|