new type - bin

This commit is contained in:
silentsai 2014-06-23 20:09:05 +08:00
parent b3e0ce9ae2
commit 5be09d5836
4 changed files with 407 additions and 0 deletions

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@ -22,6 +22,11 @@ const (
hExpMetaType
zExpType
zExpMetaType
binType
binMetaType
bExpType
bExpMetaType
)
const (

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@ -33,6 +33,7 @@ type DB struct {
listTx *tx
hashTx *tx
zsetTx *tx
binTx *tx
}
type Ledis struct {
@ -114,6 +115,7 @@ func newDB(l *Ledis, index uint8) *DB {
d.listTx = newTx(l)
d.hashTx = newTx(l)
d.zsetTx = newTx(l)
d.binTx = newTx(l)
return d
}

342
ledis/t_bin.go Normal file
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@ -0,0 +1,342 @@
package ledis
import (
"encoding/binary"
"errors"
"github.com/siddontang/ledisdb/leveldb"
)
const (
OPand byte = iota + 1
OPor
OPxor
OPnot
)
const (
segWidth uint32 = 9
segSize uint32 = uint32(1 << segWidth) // byte
minSeq uint32 = 0
maxSeq uint32 = uint32((1 << 31) - 1)
)
var bitsInByte = [256]int32{0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8}
var errBinKey = errors.New("invalid bin key")
var errOffset = errors.New("invalid offset")
func getBit(sz []byte, offset uint32) uint8 {
index := offset >> 3
if index >= uint32(len(sz)) {
return 0 // error("overflow")
}
offset -= index << 3
return sz[index] >> offset & 1
}
func setBit(sz []byte, offset uint32, val uint8) bool {
if val != 1 && val != 0 {
return false // error("invalid val")
}
index := offset >> 3
if index >= uint32(len(sz)) {
return false // error("overflow")
}
offset -= index << 3
if sz[index]>>offset&1 != val {
sz[index] ^= (1 << offset)
}
return true
}
func (db *DB) bEncodeMetaKey(key []byte) []byte {
mk := make([]byte, len(key)+2)
mk[0] = db.index
mk[1] = binMetaType
copy(mk, key)
return mk
}
func (db *DB) bEncodeBinKey(key []byte, seq uint32) []byte {
bk := make([]byte, len(key)+8)
pos := 0
bk[pos] = db.index
pos++
bk[pos] = binType
binary.BigEndian.PutUint16(bk[pos:], uint16(len(key)))
pos += 2
copy(bk[pos:], key)
pos += len(key)
binary.BigEndian.PutUint32(bk[pos:], seq)
return bk
}
func (db *DB) bDecodeBinKey(bkey []byte) (key []byte, seq uint32, err error) {
if len(bkey) < 8 || bkey[0] != db.index {
err = errBinKey
return
}
keyLen := binary.BigEndian.Uint16(bkey[2:4])
if int(keyLen+8) != len(bkey) {
err = errBinKey
return
}
key = bkey[4 : 4+keyLen]
seq = uint32(binary.BigEndian.Uint16(bkey[4+keyLen:]))
return
}
func (db *DB) bParseOffset(key []byte, offset int32) (seq uint32, off uint32, err error) {
if offset < 0 {
if tailSeq, tailOff, e := db.bGetMeta(key); e != nil {
err = e
return
} else {
offset += int32(tailSeq<<segWidth | tailOff)
if offset < 0 {
err = errOffset
return
}
}
}
off = uint32(offset)
seq = off >> segWidth
off &= (segSize - 1)
return
}
func (db *DB) bGetMeta(key []byte) (tailSeq uint32, tailOff uint32, err error) {
var v []byte
mk := db.bEncodeMetaKey(key)
v, err = db.db.Get(mk)
if err != nil {
return
}
if v != nil {
tailSeq = binary.LittleEndian.Uint32(v[0:4])
tailOff = binary.LittleEndian.Uint32(v[4:8])
}
return
}
func (db *DB) bSetMeta(t *tx, key []byte, tailSeq uint32, tailOff uint32) {
ek := db.bEncodeMetaKey(key)
// todo ..
// if size == 0 // headSeq == tailSeq
// t.Delete(ek)
buf := make([]byte, 8)
binary.LittleEndian.PutUint32(buf[0:4], tailSeq)
binary.LittleEndian.PutUint32(buf[4:8], tailOff)
t.Put(ek, buf)
return
}
func (db *DB) bUpdateMeta(t *tx, key []byte, seq uint32, off uint32) (tailSeq uint32, tailOff uint32, err error) {
if tailSeq, tailOff, err = db.bGetMeta(key); err != nil {
return
}
if seq > tailSeq || (seq == tailSeq && off > tailOff) {
db.bSetMeta(t, key, seq, off)
tailSeq = seq
tailOff = off
}
return
}
// func (db *DB) bDelete(key []byte) int64 {
// return 0
// }
func (db *DB) BGet(key []byte) (data []byte, err error) {
if err = checkKeySize(key); err != nil {
return
}
var tailSeq, tailOff uint32
if tailSeq, tailOff, err = db.bGetMeta(key); err != nil {
return
}
var offByteLen uint32 = tailOff >> 3
if tailOff&7 > 0 {
offByteLen++
}
var dataCap uint32 = tailSeq<<3 + offByteLen
data = make([]byte, dataCap)
minKey := db.bEncodeBinKey(key, minSeq)
maxKey := db.bEncodeBinKey(key, tailSeq)
it := db.db.RangeLimitIterator(minKey, maxKey, leveldb.RangeClose, 0, -1)
for pos, end := uint32(0), uint32(0); it.Valid(); it.Next() {
end = pos + segSize
if end >= offByteLen {
end = offByteLen
}
copy(data[pos:end], it.Value())
pos = end
}
it.Close()
return
}
// func (db *DB) BDelete(key []byte) (int8, error) {
// }
func (db *DB) getSegment(key []byte, seq uint32) ([]byte, []byte, error) {
bk := db.bEncodeBinKey(key, seq)
segment, err := db.db.Get(bk)
if err != nil {
return bk, nil, err
}
return bk, segment, nil
}
func (db *DB) allocateSegment(key []byte, seq uint32) ([]byte, []byte, error) {
bk, segment, err := db.getSegment(key, seq)
if err == nil && segment == nil {
segment = make([]byte, segSize, segSize) // can be optimize ?
}
return bk, segment, err
}
func (db *DB) BSetBit(key []byte, offset int32, val uint8) (ori uint8, err error) {
if err = checkKeySize(key); err != nil {
return
}
// todo : check offset
var seq, off uint32
if seq, off, err = db.bParseOffset(key, offset); err != nil {
return 0, err
}
var bk, segment []byte
if bk, segment, err = db.allocateSegment(key, seq); err != nil {
return 0, err
}
if segment != nil {
ori = getBit(segment, off)
setBit(segment, off, val)
t := db.binTx
t.Lock()
t.Put(bk, segment)
if _, _, e := db.bUpdateMeta(t, key, seq, off); e != nil {
err = e
return
}
err = t.Commit()
t.Unlock()
}
return
}
func (db *DB) BGetBit(key []byte, offset int32) (uint8, error) {
if seq, off, err := db.bParseOffset(key, offset); err != nil {
return 0, err
} else {
_, segment, err := db.getSegment(key, seq)
if err != nil {
return 0, err
}
if segment == nil {
return 0, nil
} else {
return getBit(segment, off), nil
}
}
}
// func (db *DB) BGetRange(key []byte, start int32, end int32) ([]byte, error) {
// section := make([]byte)
// return
// }
func (db *DB) BCount(key []byte, start int32, end int32) (cnt int32, err error) {
var sseq uint32
if sseq, _, err = db.bParseOffset(key, start); err != nil {
return
}
var eseq uint32
if eseq, _, err = db.bParseOffset(key, end); err != nil {
return
}
var segment []byte
skey := db.bEncodeBinKey(key, sseq)
ekey := db.bEncodeBinKey(key, eseq)
it := db.db.RangeLimitIterator(skey, ekey, leveldb.RangeClose, 0, -1)
for ; it.Valid(); it.Next() {
segment = it.Value()
for _, bit := range segment {
cnt += bitsInByte[bit]
}
}
it.Close()
return
}
// func (db *DB) BLen(key []) (uint32, error) {
// }
// func (db *DB) BOperation(op byte, dstkey []byte, srckeys ...[]byte) (int32, error) {
// // return :
// // The size of the string stored in the destination key,
// // that is equal to the size of the longest input string.
// if op < OPand || op > OPnot {
// 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) BScan(key []byte, count int, inclusive bool) ([]KVPair, error) {
// }
// func (db *DB) bFlush() (drop int64, err error) {
// }

58
ledis/t_bin_test.go Normal file
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@ -0,0 +1,58 @@
package ledis
import (
"testing"
)
func cmpBytes(a []byte, b []byte) bool {
if len(a) != len(b) {
return true
}
for i, n := range a {
if n != b[i] {
return true
}
}
return false
}
func TestBinary(t *testing.T) {
db := getTestDB()
key := []byte("test_bin")
if v, _ := db.BGetBit(key, 100); v != 0 {
t.Error(v)
}
if ori, _ := db.BSetBit(key, 50, 1); ori != 0 {
t.Error(ori)
}
if v, _ := db.BGetBit(key, 50); v != 1 {
t.Error(v)
}
if ori, _ := db.BSetBit(key, 50, 0); ori != 1 {
t.Error(ori)
}
if v, _ := db.BGetBit(key, 50); v != 0 {
t.Error(v)
}
db.BSetBit(key, 7, 1)
db.BSetBit(key, 8, 1)
db.BSetBit(key, 9, 1)
db.BSetBit(key, 10, 1)
if sum, _ := db.BCount(key, 0, -1); sum != 4 {
t.Error(sum)
}
data, _ := db.BGet(key)
if cmpBytes(data, []byte{0x80, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00}) {
t.Error(data)
}
}