forked from mirror/ledisdb
687 lines
14 KiB
Go
687 lines
14 KiB
Go
package ledis
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"errors"
|
|
"github.com/siddontang/go-leveldb/leveldb"
|
|
)
|
|
|
|
const (
|
|
MinScore int64 = -1<<63 + 1
|
|
MaxScore int64 = 1<<63 - 1
|
|
)
|
|
|
|
type ScorePair struct {
|
|
Score int64
|
|
Member []byte
|
|
}
|
|
|
|
var errZSizeKey = errors.New("invalid zsize key")
|
|
var errZSetKey = errors.New("invalid zset key")
|
|
var errZScoreKey = errors.New("invalid zscore key")
|
|
var errScoreOverflow = errors.New("zset score overflow")
|
|
|
|
const (
|
|
zsetNScoreSep byte = '<'
|
|
zsetPScoreSep byte = zsetNScoreSep + 1
|
|
zsetStopScoreSep byte = zsetPScoreSep + 1
|
|
|
|
zsetStartMemSep byte = ':'
|
|
zsetStopMemSep byte = zsetStartMemSep + 1
|
|
)
|
|
|
|
func checkZSetKMSize(key []byte, member []byte) error {
|
|
if len(key) > MaxKeySize || len(key) == 0 {
|
|
return ErrKeySize
|
|
} else if len(member) > MaxZSetMemberSize || len(member) == 0 {
|
|
return ErrZSetMemberSize
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (db *DB) zEncodeSizeKey(key []byte) []byte {
|
|
buf := make([]byte, len(key)+2)
|
|
buf[0] = db.index
|
|
buf[1] = zSizeType
|
|
|
|
copy(buf[2:], key)
|
|
return buf
|
|
}
|
|
|
|
func (db *DB) zDecodeSizeKey(ek []byte) ([]byte, error) {
|
|
if len(ek) < 2 || ek[0] != db.index || ek[1] != zSizeType {
|
|
return nil, errZSizeKey
|
|
}
|
|
|
|
return ek[2:], nil
|
|
}
|
|
|
|
func (db *DB) zEncodeSetKey(key []byte, member []byte) []byte {
|
|
buf := make([]byte, len(key)+len(member)+4)
|
|
|
|
pos := 0
|
|
buf[pos] = db.index
|
|
pos++
|
|
|
|
buf[pos] = zsetType
|
|
pos++
|
|
|
|
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
|
|
pos += 2
|
|
|
|
copy(buf[pos:], key)
|
|
pos += len(key)
|
|
|
|
copy(buf[pos:], member)
|
|
|
|
return buf
|
|
}
|
|
|
|
func (db *DB) zDecodeSetKey(ek []byte) ([]byte, []byte, error) {
|
|
if len(ek) < 4 || ek[0] != db.index || ek[1] != zsetType {
|
|
return nil, nil, errZSetKey
|
|
}
|
|
|
|
keyLen := int(binary.BigEndian.Uint16(ek[2:]))
|
|
if keyLen+4 > len(ek) {
|
|
return nil, nil, errZSetKey
|
|
}
|
|
|
|
key := ek[4 : 4+keyLen]
|
|
member := ek[4+keyLen:]
|
|
return key, member, nil
|
|
}
|
|
|
|
func (db *DB) zEncodeScoreKey(key []byte, member []byte, score int64) []byte {
|
|
buf := make([]byte, len(key)+len(member)+14)
|
|
|
|
pos := 0
|
|
buf[pos] = db.index
|
|
pos++
|
|
|
|
buf[pos] = zScoreType
|
|
pos++
|
|
|
|
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
|
|
pos += 2
|
|
|
|
copy(buf[pos:], key)
|
|
pos += len(key)
|
|
|
|
if score < 0 {
|
|
buf[pos] = zsetNScoreSep
|
|
} else {
|
|
buf[pos] = zsetPScoreSep
|
|
}
|
|
|
|
pos++
|
|
binary.BigEndian.PutUint64(buf[pos:], uint64(score))
|
|
pos += 8
|
|
|
|
buf[pos] = zsetStartMemSep
|
|
pos++
|
|
|
|
copy(buf[pos:], member)
|
|
return buf
|
|
}
|
|
|
|
func (db *DB) zEncodeStartScoreKey(key []byte, score int64) []byte {
|
|
return db.zEncodeScoreKey(key, nil, score)
|
|
}
|
|
|
|
func (db *DB) zEncodeStopScoreKey(key []byte, score int64) []byte {
|
|
k := db.zEncodeScoreKey(key, nil, score)
|
|
k[len(k)-1] = zsetStopMemSep
|
|
return k
|
|
}
|
|
|
|
func (db *DB) zDecodeScoreKey(ek []byte) (key []byte, member []byte, score int64, err error) {
|
|
if len(ek) < 14 || ek[0] != db.index || ek[1] != zScoreType {
|
|
err = errZScoreKey
|
|
return
|
|
}
|
|
|
|
keyLen := int(binary.BigEndian.Uint16(ek[2:]))
|
|
if keyLen+14 > len(ek) {
|
|
err = errZScoreKey
|
|
return
|
|
}
|
|
|
|
key = ek[4 : 4+keyLen]
|
|
pos := 4 + keyLen
|
|
|
|
if (ek[pos] != zsetNScoreSep) && (ek[pos] != zsetPScoreSep) {
|
|
err = errZScoreKey
|
|
return
|
|
}
|
|
pos++
|
|
|
|
score = int64(binary.BigEndian.Uint64(ek[pos:]))
|
|
pos += 8
|
|
|
|
if ek[pos] != zsetStartMemSep {
|
|
err = errZScoreKey
|
|
return
|
|
}
|
|
|
|
pos++
|
|
|
|
member = ek[pos:]
|
|
return
|
|
}
|
|
|
|
func (db *DB) zSetItem(key []byte, score int64, member []byte) (int64, error) {
|
|
if score <= MinScore || score >= MaxScore {
|
|
return 0, errScoreOverflow
|
|
}
|
|
|
|
t := db.zsetTx
|
|
|
|
var exists int64 = 0
|
|
ek := db.zEncodeSetKey(key, member)
|
|
|
|
if v, err := db.db.Get(ek); err != nil {
|
|
return 0, err
|
|
} else if v != nil {
|
|
exists = 1
|
|
|
|
if s, err := Int64(v, err); err != nil {
|
|
return 0, err
|
|
} else {
|
|
sk := db.zEncodeScoreKey(key, member, s)
|
|
t.Delete(sk)
|
|
}
|
|
}
|
|
|
|
t.Put(ek, PutInt64(score))
|
|
|
|
sk := db.zEncodeScoreKey(key, member, score)
|
|
t.Put(sk, []byte{})
|
|
|
|
return exists, nil
|
|
}
|
|
|
|
func (db *DB) zDelItem(key []byte, member []byte, skipDelScore bool) (int64, error) {
|
|
t := db.zsetTx
|
|
|
|
ek := db.zEncodeSetKey(key, member)
|
|
if v, err := db.db.Get(ek); err != nil {
|
|
return 0, err
|
|
} else if v == nil {
|
|
//not exists
|
|
return 0, nil
|
|
} else {
|
|
//exists
|
|
if !skipDelScore {
|
|
//we must del score
|
|
if s, err := Int64(v, err); err != nil {
|
|
return 0, err
|
|
} else {
|
|
sk := db.zEncodeScoreKey(key, member, s)
|
|
t.Delete(sk)
|
|
}
|
|
}
|
|
}
|
|
|
|
t.Delete(ek)
|
|
return 1, nil
|
|
}
|
|
|
|
func (db *DB) ZAdd(key []byte, args ...ScorePair) (int64, error) {
|
|
if len(args) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
t := db.zsetTx
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
var num int64 = 0
|
|
for i := 0; i < len(args); i++ {
|
|
score := args[i].Score
|
|
member := args[i].Member
|
|
|
|
if err := checkZSetKMSize(key, member); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
if n, err := db.zSetItem(key, score, member); err != nil {
|
|
return 0, err
|
|
} else if n == 0 {
|
|
//add new
|
|
num++
|
|
}
|
|
}
|
|
|
|
if _, err := db.zIncrSize(key, num); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
//todo add binlog
|
|
err := t.Commit()
|
|
return num, err
|
|
}
|
|
|
|
func (db *DB) zIncrSize(key []byte, delta int64) (int64, error) {
|
|
t := db.zsetTx
|
|
sk := db.zEncodeSizeKey(key)
|
|
|
|
size, err := Int64(db.db.Get(sk))
|
|
if err != nil {
|
|
return 0, err
|
|
} else {
|
|
size += delta
|
|
if size <= 0 {
|
|
size = 0
|
|
t.Delete(sk)
|
|
} else {
|
|
t.Put(sk, PutInt64(size))
|
|
}
|
|
}
|
|
|
|
return size, nil
|
|
}
|
|
|
|
func (db *DB) ZCard(key []byte) (int64, error) {
|
|
if err := checkKeySize(key); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
sk := db.zEncodeSizeKey(key)
|
|
return Int64(db.db.Get(sk))
|
|
}
|
|
|
|
func (db *DB) ZScore(key []byte, member []byte) ([]byte, error) {
|
|
if err := checkZSetKMSize(key, member); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
k := db.zEncodeSetKey(key, member)
|
|
|
|
score, err := Int64(db.db.Get(k))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return StrPutInt64(score), nil
|
|
}
|
|
|
|
func (db *DB) ZRem(key []byte, members ...[]byte) (int64, error) {
|
|
if len(members) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
t := db.zsetTx
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
var num int64 = 0
|
|
for i := 0; i < len(members); i++ {
|
|
if err := checkZSetKMSize(key, members[i]); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
if n, err := db.zDelItem(key, members[i], false); err != nil {
|
|
return 0, err
|
|
} else if n == 1 {
|
|
num++
|
|
}
|
|
}
|
|
|
|
if _, err := db.zIncrSize(key, -num); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
err := t.Commit()
|
|
return num, err
|
|
}
|
|
|
|
func (db *DB) ZIncrBy(key []byte, delta int64, member []byte) ([]byte, error) {
|
|
if err := checkZSetKMSize(key, member); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
t := db.zsetTx
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
ek := db.zEncodeSetKey(key, member)
|
|
|
|
var score int64 = delta
|
|
|
|
v, err := db.db.Get(ek)
|
|
if err != nil {
|
|
return nil, err
|
|
} else if v != nil {
|
|
if s, err := Int64(v, err); err != nil {
|
|
return nil, err
|
|
} else {
|
|
sk := db.zEncodeScoreKey(key, member, s)
|
|
t.Delete(sk)
|
|
|
|
score = s + delta
|
|
|
|
if score >= MaxScore || score <= MinScore {
|
|
return nil, errScoreOverflow
|
|
}
|
|
}
|
|
} else {
|
|
db.zIncrSize(key, 1)
|
|
}
|
|
|
|
t.Put(ek, PutInt64(score))
|
|
|
|
sk := db.zEncodeScoreKey(key, member, score)
|
|
t.Put(sk, []byte{})
|
|
|
|
err = t.Commit()
|
|
return StrPutInt64(score), err
|
|
}
|
|
|
|
func (db *DB) ZCount(key []byte, min int64, max int64) (int64, error) {
|
|
if err := checkKeySize(key); err != nil {
|
|
return 0, err
|
|
}
|
|
minKey := db.zEncodeStartScoreKey(key, min)
|
|
maxKey := db.zEncodeStopScoreKey(key, max)
|
|
|
|
rangeType := leveldb.RangeROpen
|
|
|
|
it := db.db.Iterator(minKey, maxKey, rangeType, 0, -1)
|
|
var n int64 = 0
|
|
for ; it.Valid(); it.Next() {
|
|
n++
|
|
}
|
|
it.Close()
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func (db *DB) zrank(key []byte, member []byte, reverse bool) (int64, error) {
|
|
if err := checkZSetKMSize(key, member); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
k := db.zEncodeSetKey(key, member)
|
|
|
|
if v, err := db.db.Get(k); err != nil {
|
|
return 0, err
|
|
} else if v == nil {
|
|
return -1, nil
|
|
} else {
|
|
if s, err := Int64(v, err); err != nil {
|
|
return 0, err
|
|
} else {
|
|
var it *leveldb.Iterator
|
|
|
|
sk := db.zEncodeScoreKey(key, member, s)
|
|
|
|
if !reverse {
|
|
minKey := db.zEncodeStartScoreKey(key, MinScore)
|
|
it = db.db.Iterator(minKey, sk, leveldb.RangeClose, 0, -1)
|
|
} else {
|
|
maxKey := db.zEncodeStopScoreKey(key, MaxScore)
|
|
it = db.db.RevIterator(sk, maxKey, leveldb.RangeClose, 0, -1)
|
|
}
|
|
|
|
var lastKey []byte = nil
|
|
var n int64 = 0
|
|
|
|
for ; it.Valid(); it.Next() {
|
|
n++
|
|
|
|
lastKey = it.Key()
|
|
}
|
|
|
|
it.Close()
|
|
|
|
if _, m, _, err := db.zDecodeScoreKey(lastKey); err == nil && bytes.Equal(m, member) {
|
|
n--
|
|
return n, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return -1, nil
|
|
}
|
|
|
|
func (db *DB) zIterator(key []byte, min int64, max int64, offset int, limit int, reverse bool) *leveldb.Iterator {
|
|
minKey := db.zEncodeStartScoreKey(key, min)
|
|
maxKey := db.zEncodeStopScoreKey(key, max)
|
|
|
|
if !reverse {
|
|
return db.db.Iterator(minKey, maxKey, leveldb.RangeClose, offset, limit)
|
|
} else {
|
|
return db.db.RevIterator(minKey, maxKey, leveldb.RangeClose, offset, limit)
|
|
}
|
|
}
|
|
|
|
func (db *DB) zRemRange(key []byte, min int64, max int64, offset int, limit int) (int64, error) {
|
|
if len(key) > MaxKeySize {
|
|
return 0, ErrKeySize
|
|
}
|
|
|
|
t := db.zsetTx
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
it := db.zIterator(key, min, max, offset, limit, false)
|
|
var num int64 = 0
|
|
for ; it.Valid(); it.Next() {
|
|
k := it.Key()
|
|
_, m, _, err := db.zDecodeScoreKey(k)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
if n, err := db.zDelItem(key, m, true); err != nil {
|
|
return 0, err
|
|
} else if n == 1 {
|
|
num++
|
|
}
|
|
|
|
t.Delete(k)
|
|
}
|
|
|
|
if _, err := db.zIncrSize(key, -num); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
//todo add binlog
|
|
|
|
err := t.Commit()
|
|
return num, err
|
|
}
|
|
|
|
func (db *DB) zReverse(s []interface{}, withScores bool) []interface{} {
|
|
if withScores {
|
|
for i, j := 0, len(s)-2; i < j; i, j = i+2, j-2 {
|
|
s[i], s[j] = s[j], s[i]
|
|
s[i+1], s[j+1] = s[j+1], s[i+1]
|
|
}
|
|
} else {
|
|
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
|
|
s[i], s[j] = s[j], s[i]
|
|
}
|
|
}
|
|
|
|
return s
|
|
}
|
|
|
|
func (db *DB) zRange(key []byte, min int64, max int64, withScores bool, offset int, limit int, reverse bool) ([]interface{}, error) {
|
|
if len(key) > MaxKeySize {
|
|
return nil, ErrKeySize
|
|
}
|
|
|
|
if offset < 0 {
|
|
return []interface{}{}, nil
|
|
}
|
|
|
|
nv := 64
|
|
if limit > 0 {
|
|
nv = limit
|
|
}
|
|
if withScores {
|
|
nv = 2 * nv
|
|
}
|
|
v := make([]interface{}, 0, nv)
|
|
|
|
var it *leveldb.Iterator
|
|
|
|
//if reverse and offset is 0, limit < 0, we may use forward iterator then reverse
|
|
//because leveldb iterator prev is slower than next
|
|
if !reverse || (offset == 0 && limit < 0) {
|
|
it = db.zIterator(key, min, max, offset, limit, false)
|
|
} else {
|
|
it = db.zIterator(key, min, max, offset, limit, true)
|
|
}
|
|
|
|
for ; it.Valid(); it.Next() {
|
|
_, m, s, err := db.zDecodeScoreKey(it.Key())
|
|
//may be we will check key equal?
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
v = append(v, m)
|
|
|
|
if withScores {
|
|
v = append(v, StrPutInt64(s))
|
|
}
|
|
}
|
|
|
|
if reverse && (offset == 0 && limit < 0) {
|
|
v = db.zReverse(v, withScores)
|
|
}
|
|
|
|
return v, nil
|
|
}
|
|
|
|
func (db *DB) zParseLimit(key []byte, start int, stop int) (offset int, limit int, err error) {
|
|
if start < 0 || stop < 0 {
|
|
//refer redis implementation
|
|
var size int64
|
|
size, err = db.ZCard(key)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
llen := int(size)
|
|
|
|
if start < 0 {
|
|
start = llen + start
|
|
}
|
|
if stop < 0 {
|
|
stop = llen + stop
|
|
}
|
|
|
|
if start < 0 {
|
|
start = 0
|
|
}
|
|
|
|
if start >= llen {
|
|
offset = -1
|
|
return
|
|
}
|
|
}
|
|
|
|
if start > stop {
|
|
offset = -1
|
|
return
|
|
}
|
|
|
|
offset = start
|
|
limit = (stop - start) + 1
|
|
return
|
|
}
|
|
|
|
func (db *DB) ZClear(key []byte) (int64, error) {
|
|
return db.zRemRange(key, MinScore, MaxScore, 0, -1)
|
|
}
|
|
|
|
func (db *DB) ZRange(key []byte, start int, stop int, withScores bool) ([]interface{}, error) {
|
|
return db.ZRangeGeneric(key, start, stop, withScores, false)
|
|
}
|
|
|
|
//min and max must be inclusive
|
|
//if no limit, set offset = 0 and count = -1
|
|
func (db *DB) ZRangeByScore(key []byte, min int64, max int64,
|
|
withScores bool, offset int, count int) ([]interface{}, error) {
|
|
return db.ZRangeByScoreGeneric(key, min, max, withScores, offset, count, false)
|
|
}
|
|
|
|
func (db *DB) ZRank(key []byte, member []byte) (int64, error) {
|
|
return db.zrank(key, member, false)
|
|
}
|
|
|
|
func (db *DB) ZRemRangeByRank(key []byte, start int, stop int) (int64, error) {
|
|
offset, limit, err := db.zParseLimit(key, start, stop)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return db.zRemRange(key, MinScore, MaxScore, offset, limit)
|
|
}
|
|
|
|
//min and max must be inclusive
|
|
func (db *DB) ZRemRangeByScore(key []byte, min int64, max int64) (int64, error) {
|
|
return db.zRemRange(key, min, max, 0, -1)
|
|
}
|
|
|
|
func (db *DB) ZRevRange(key []byte, start int, stop int, withScores bool) ([]interface{}, error) {
|
|
return db.ZRangeGeneric(key, start, stop, withScores, true)
|
|
}
|
|
|
|
func (db *DB) ZRevRank(key []byte, member []byte) (int64, error) {
|
|
return db.zrank(key, member, true)
|
|
}
|
|
|
|
//min and max must be inclusive
|
|
//if no limit, set offset = 0 and count = -1
|
|
func (db *DB) ZRevRangeByScore(key []byte, min int64, max int64,
|
|
withScores bool, offset int, count int) ([]interface{}, error) {
|
|
return db.ZRangeByScoreGeneric(key, min, max, withScores, offset, count, true)
|
|
}
|
|
|
|
func (db *DB) ZRangeGeneric(key []byte, start int, stop int,
|
|
withScores bool, reverse bool) ([]interface{}, error) {
|
|
offset, limit, err := db.zParseLimit(key, start, stop)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return db.zRange(key, MinScore, MaxScore, withScores, offset, limit, reverse)
|
|
}
|
|
|
|
//min and max must be inclusive
|
|
//if no limit, set offset = 0 and count = -1
|
|
func (db *DB) ZRangeByScoreGeneric(key []byte, min int64, max int64,
|
|
withScores bool, offset int, count int, reverse bool) ([]interface{}, error) {
|
|
|
|
return db.zRange(key, min, max, withScores, offset, count, reverse)
|
|
}
|
|
|
|
func (db *DB) ZFlush() (drop int64, err error) {
|
|
t := db.zsetTx
|
|
t.Lock()
|
|
defer t.Unlock()
|
|
|
|
minKey := make([]byte, 2)
|
|
minKey[0] = db.index
|
|
minKey[1] = zsetType
|
|
|
|
maxKey := make([]byte, 2)
|
|
maxKey[0] = db.index
|
|
maxKey[1] = zScoreType + 1
|
|
|
|
it := db.db.Iterator(minKey, maxKey, leveldb.RangeROpen, 0, -1)
|
|
for ; it.Valid(); it.Next() {
|
|
t.Delete(it.Key())
|
|
drop++
|
|
}
|
|
|
|
err = t.Commit()
|
|
// to do : binlog
|
|
return
|
|
}
|