forked from absolute8511/ZanRedisDB
/
t_kv.go
928 lines (828 loc) · 21.9 KB
/
t_kv.go
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package rockredis
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"math/bits"
"time"
"github.com/youzan/ZanRedisDB/common"
"github.com/youzan/ZanRedisDB/engine"
)
// kv new format as below:
// KVType | key -> |value header| value | modify time|
const (
tsLen = 8
// 2MB
MaxBitOffset = 2 * 8 * 1024 * 1024
)
const (
defaultSep byte = ':'
)
var errKVKey = errors.New("invalid encode kv key")
var errInvalidDBValue = errors.New("invalide db value")
var ErrBitOverflow = errors.New("bit offset overflowed")
var errInvalidTTL = errors.New("invalid expire time")
func convertRedisKeyToDBKVKey(key []byte) ([]byte, []byte, error) {
table, _, _ := extractTableFromRedisKey(key)
if len(table) == 0 {
return nil, nil, errTableName
}
if err := checkKeySize(key); err != nil {
return nil, nil, err
}
key = encodeKVKey(key)
return table, key, nil
}
func checkKeySize(key []byte) error {
return common.CheckKey(key)
}
func checkValueSize(value []byte) error {
if len(value) > MaxValueSize {
return errValueSize
}
return nil
}
func encodeKVKey(key []byte) []byte {
ek := make([]byte, len(key)+1)
pos := 0
ek[pos] = KVType
pos++
copy(ek[pos:], key)
return ek
}
func decodeKVKey(ek []byte) ([]byte, error) {
pos := 0
if pos+1 > len(ek) || ek[pos] != KVType {
return nil, errKVKey
}
pos++
return ek[pos:], nil
}
type verKeyInfo struct {
OldHeader *headerMetaValue
Expired bool
Table []byte
VerKey []byte
}
// decoded meta for compatible with old format
func (info verKeyInfo) MetaData() []byte {
return info.OldHeader.UserData
}
// use for kv write operation to do some init on header
func (db *RockDB) prepareKVValueForWrite(ts int64, rawKey []byte, reset bool) (verKeyInfo, []byte, error) {
var keyInfo verKeyInfo
var err error
var v []byte
keyInfo.Table, keyInfo.VerKey, v, keyInfo.Expired, err = db.getRawDBKVValue(ts, rawKey, false)
if err != nil {
return keyInfo, nil, err
}
// expired is true only if the value is exist and expired time is reached.
// we need decode old data on expired to left the caller to check the expired state
var realV []byte
realV, keyInfo.OldHeader, err = db.decodeDBRawValueToRealValue(v)
if err != nil {
return keyInfo, nil, err
}
if keyInfo.Expired || reset {
// since renew may not remove the old expire meta under consistence policy,
// we need delete expire meta for kv type to avoid expire the new rewrite data
db.expiration.renewOnExpired(ts, KVType, rawKey, keyInfo.OldHeader)
}
if realV == nil {
return keyInfo, nil, nil
}
return keyInfo, realV, nil
}
// this will reset the expire meta on old and rewrite the value with new ttl and new header
func (db *RockDB) resetWithNewKVValue(ts int64, rawKey []byte, value []byte, ttl int64, wb engine.WriteBatch) ([]byte, error) {
oldHeader, err := db.expiration.decodeRawValue(KVType, nil)
if err != nil {
return nil, err
}
oldHeader.UserData = value
value = db.expiration.encodeToRawValue(KVType, oldHeader)
if ttl <= 0 {
value, err = db.expiration.delExpire(KVType, rawKey, value, true, wb)
} else {
value, err = db.expiration.rawExpireAt(KVType, rawKey, value, ttl+ts/int64(time.Second), wb)
}
if err != nil {
return nil, err
}
var nvalue []byte
if len(value)+8 > len(db.writeTmpBuf) {
nvalue = make([]byte, len(value)+8)
} else {
nvalue = db.writeTmpBuf[:len(value)+8]
}
copy(nvalue, value)
PutInt64ToBuf(ts, nvalue[len(value):])
return nvalue, nil
}
// encode the user kv data (no header and no modify time) to the db value (include header and modify time)
func (db *RockDB) encodeRealValueToDBRawValue(ts int64, oldh *headerMetaValue, value []byte) []byte {
oldh.UserData = value
buf := db.expiration.encodeToRawValue(KVType, oldh)
tsBuf := PutInt64(ts)
buf = append(buf, tsBuf...)
return buf
}
// decode the db value (include header and modify time) to the real user kv data + header
func (db *RockDB) decodeDBRawValueToRealValue(value []byte) ([]byte, *headerMetaValue, error) {
if len(value) >= tsLen {
value = value[:len(value)-tsLen]
}
oldh, err := db.expiration.decodeRawValue(KVType, value)
if err != nil {
return nil, oldh, err
}
return oldh.UserData, oldh, nil
}
// read from db and header and modify time will be removed for returned real value
func (db *RockDB) getDBKVRealValueAndHeader(ts int64, rawKey []byte, useLock bool) (verKeyInfo, []byte, error) {
var keyInfo verKeyInfo
var err error
var v []byte
keyInfo.Table, keyInfo.VerKey, v, keyInfo.Expired, err = db.getRawDBKVValue(ts, rawKey, useLock)
if err != nil {
return keyInfo, nil, err
}
// expired is true only if the value is exist and expired time is reached.
// we need decode old data on expired to left the caller to check the expired state
var realV []byte
realV, keyInfo.OldHeader, err = db.decodeDBRawValueToRealValue(v)
if err != nil {
return keyInfo, nil, err
}
if realV == nil {
return keyInfo, nil, nil
}
return keyInfo, realV, nil
}
func (db *RockDB) getAndCheckExpRealValue(ts int64, rawKey []byte, rawValue []byte, useLock bool) (bool, []byte, error) {
if rawValue == nil {
return false, nil, nil
}
expired, err := db.expiration.isExpired(ts, KVType, rawKey, rawValue, useLock)
if err != nil {
return false, nil, err
}
realV, _, err := db.decodeDBRawValueToRealValue(rawValue)
if err != nil {
return expired, nil, err
}
return expired, realV, nil
}
// should use only in read operation
func (db *RockDB) isKVExistOrExpired(ts int64, rawKey []byte) (int64, error) {
_, kk, err := convertRedisKeyToDBKVKey(rawKey)
if err != nil {
return 0, err
}
vref, err := db.rockEng.GetRef(kk)
if err != nil {
return 0, err
}
if vref == nil {
return 0, nil
}
defer vref.Free()
v := vref.Data()
if v == nil {
return 0, nil
}
expired, err := db.expiration.isExpired(ts, KVType, rawKey, v, true)
if expired {
return 0, err
}
return 1, err
}
// Get the kv value including the header meta and modify time
func (db *RockDB) getRawDBKVValue(ts int64, rawKey []byte, useLock bool) ([]byte, []byte, []byte, bool, error) {
table, key, err := convertRedisKeyToDBKVKey(rawKey)
if err != nil {
return table, key, nil, false, err
}
var v []byte
if useLock {
v, err = db.GetBytes(key)
} else {
v, err = db.GetBytesNoLock(key)
}
if err != nil {
return table, key, nil, false, err
}
if v == nil {
return table, key, nil, false, nil
}
expired, err := db.expiration.isExpired(ts, KVType, rawKey, v, useLock)
if err != nil {
return table, key, v, expired, err
}
return table, key, v, expired, nil
}
func (db *RockDB) incr(ts int64, key []byte, delta int64) (int64, error) {
keyInfo, realV, err := db.prepareKVValueForWrite(ts, key, false)
if err != nil {
return 0, err
}
created := false
n := int64(0)
if realV == nil || keyInfo.Expired {
// expired will rewrite old, which should not change table counter
created = (realV == nil)
} else {
n, err = StrInt64(realV, err)
if err != nil {
return 0, err
}
}
n += delta
buf := FormatInt64ToSlice(n)
buf = db.encodeRealValueToDBRawValue(ts, keyInfo.OldHeader, buf)
db.wb.Put(keyInfo.VerKey, buf)
if created {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
err = db.CommitBatchWrite()
return n, err
}
// ps : here just focus on deleting the key-value data,
// any other likes expire is ignore.
func (db *RockDB) kvDel(key []byte, wb engine.WriteBatch) (int64, error) {
rawKey := key
table, key, err := convertRedisKeyToDBKVKey(key)
if err != nil {
return 0, err
}
delCnt := int64(1)
if db.cfg.EnableTableCounter {
if !db.cfg.EstimateTableCounter {
vok, _ := db.ExistNoLock(key)
if vok {
db.IncrTableKeyCount(table, -1, wb)
} else {
delCnt = int64(0)
}
} else {
db.IncrTableKeyCount(table, -1, wb)
}
}
wb.Delete(key)
// fixme: if del is batched, the deleted key may be in write batch while removing cache
// and removed cache may be reload by read before the write batch is committed.
db.delPFCache(rawKey)
return delCnt, nil
}
func (db *RockDB) KVDelWithBatch(key []byte, wb engine.WriteBatch) error {
table, key, err := convertRedisKeyToDBKVKey(key)
if err != nil {
return err
}
if db.cfg.EnableTableCounter {
if !db.cfg.EstimateTableCounter {
vok, _ := db.ExistNoLock(key)
if vok {
db.IncrTableKeyCount(table, -1, wb)
}
} else {
db.IncrTableKeyCount(table, -1, wb)
}
}
wb.Delete(key)
return nil
}
func (db *RockDB) Decr(ts int64, key []byte) (int64, error) {
return db.incr(ts, key, -1)
}
func (db *RockDB) DecrBy(ts int64, key []byte, decrement int64) (int64, error) {
return db.incr(ts, key, -decrement)
}
func (db *RockDB) DelKeys(keys ...[]byte) (int64, error) {
if len(keys) == 0 {
return 0, nil
}
delCnt := int64(0)
for _, k := range keys {
c, _ := db.kvDel(k, db.wb)
delCnt += c
}
//clear all the expire meta data related to the keys
for _, k := range keys {
db.delExpire(KVType, k, nil, false, db.wb)
}
err := db.MaybeCommitBatch()
if err != nil {
return 0, err
}
return delCnt, nil
}
func (db *RockDB) KVExists(keys ...[]byte) (int64, error) {
tn := time.Now().UnixNano()
if len(keys) == 1 {
return db.isKVExistOrExpired(tn, keys[0])
}
keyList := make([][]byte, len(keys))
valueList := make([][]byte, len(keys))
errs := make([]error, len(keys))
for i, k := range keys {
_, kk, err := convertRedisKeyToDBKVKey(k)
if err != nil {
keyList[i] = nil
errs[i] = err
} else {
keyList[i] = kk
}
}
cnt := int64(0)
db.MultiGetBytes(keyList, valueList, errs)
for i, v := range valueList {
if errs[i] == nil && v != nil {
expired, _ := db.expiration.isExpired(tn, KVType, keys[i], v, true)
if expired {
continue
}
cnt++
}
}
return cnt, nil
}
func (db *RockDB) KVGetVer(key []byte) (int64, error) {
_, key, err := convertRedisKeyToDBKVKey(key)
if err != nil {
return 0, err
}
var ts uint64
v, err := db.GetBytes(key)
if len(v) >= tsLen {
ts, err = Uint64(v[len(v)-tsLen:], err)
}
return int64(ts), err
}
func (db *RockDB) GetValueWithOpNoLock(rawKey []byte,
op func([]byte) error) error {
_, key, err := convertRedisKeyToDBKVKey(rawKey)
if err != nil {
return err
}
return db.rockEng.GetValueWithOpNoLock(key, func(v []byte) error {
ts := time.Now().UnixNano()
expired, realV, err := db.getAndCheckExpRealValue(ts, rawKey, v, false)
if err != nil {
return err
}
if expired {
realV = nil
}
return op(realV)
})
}
func (db *RockDB) GetValueWithOp(rawKey []byte,
op func([]byte) error) error {
_, key, err := convertRedisKeyToDBKVKey(rawKey)
if err != nil {
return err
}
return db.rockEng.GetValueWithOp(key, func(v []byte) error {
ts := time.Now().UnixNano()
expired, realV, err := db.getAndCheckExpRealValue(ts, rawKey, v, false)
if err != nil {
return err
}
if expired {
realV = nil
}
return op(realV)
})
}
func (db *RockDB) KVGet(key []byte) ([]byte, error) {
tn := time.Now().UnixNano()
keyInfo, v, err := db.getDBKVRealValueAndHeader(tn, key, true)
if err != nil {
return nil, err
}
if keyInfo.Expired || v == nil {
return nil, nil
}
return v, nil
}
// KVGetExpired will get the value even it is expired
func (db *RockDB) KVGetExpired(key []byte) ([]byte, error) {
tn := time.Now().UnixNano()
_, v, err := db.getDBKVRealValueAndHeader(tn, key, true)
if err != nil {
return nil, err
}
if v == nil {
return nil, nil
}
return v, nil
}
func (db *RockDB) Incr(ts int64, key []byte) (int64, error) {
return db.incr(ts, key, 1)
}
func (db *RockDB) IncrBy(ts int64, key []byte, increment int64) (int64, error) {
return db.incr(ts, key, increment)
}
func (db *RockDB) MGet(keys ...[]byte) ([][]byte, []error) {
keyList := make([][]byte, len(keys))
valueList := make([][]byte, len(keys))
errs := make([]error, len(keys))
for i, k := range keys {
_, kk, err := convertRedisKeyToDBKVKey(k)
if err != nil {
keyList[i] = nil
errs[i] = err
} else {
keyList[i] = kk
}
}
tn := time.Now().UnixNano()
db.MultiGetBytes(keyList, valueList, errs)
//log.Printf("mget: %v", keyList)
for i, v := range valueList {
if errs[i] == nil {
expired, realV, err := db.getAndCheckExpRealValue(tn, keys[i], v, true)
if err != nil {
errs[i] = err
} else if expired {
valueList[i] = nil
} else {
valueList[i] = realV
}
}
}
return valueList, errs
}
func (db *RockDB) MSet(ts int64, args ...common.KVRecord) error {
if len(args) == 0 {
return nil
}
if len(args) > MAX_BATCH_NUM {
return errTooMuchBatchSize
}
var err error
var key []byte
var value []byte
tableCnt := make(map[string]int)
var table []byte
for i := 0; i < len(args); i++ {
table, key, err = convertRedisKeyToDBKVKey(args[i].Key)
if err != nil {
return err
} else if err = checkValueSize(args[i].Value); err != nil {
return err
}
value = value[:0]
value = append(value, args[i].Value...)
if db.cfg.EnableTableCounter {
vok := false
if !db.cfg.EstimateTableCounter {
vok, _ = db.ExistNoLock(key)
}
if !vok {
n := tableCnt[string(table)]
n++
tableCnt[string(table)] = n
}
}
value, err = db.resetWithNewKVValue(ts, args[i].Key, value, 0, db.wb)
if err != nil {
return err
}
db.wb.Put(key, value)
}
for t, num := range tableCnt {
db.IncrTableKeyCount([]byte(t), int64(num), db.wb)
}
err = db.MaybeCommitBatch()
return err
}
func (db *RockDB) KVSet(ts int64, rawKey []byte, value []byte) error {
return db.setKV(ts, rawKey, value, 0)
}
func (db *RockDB) KVSetWithOpts(ts int64, rawKey []byte, value []byte, duration int64, createOnly bool, updateOnly bool) (int64, error) {
if err := checkValueSize(value); err != nil {
return 0, err
}
keyInfo, realV, err := db.prepareKVValueForWrite(ts, rawKey, false)
if err != nil {
return 0, err
}
if createOnly && realV != nil && !keyInfo.Expired {
return 0, nil
}
if updateOnly && (realV == nil || keyInfo.Expired) {
return 0, nil
}
if realV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
// prepare for write will renew the expire data on expired value,
// however, we still need del the old expire meta data since it may store the
// expire meta data in different place under different expire policy.
value, err = db.resetWithNewKVValue(ts, rawKey, value, duration, db.wb)
db.wb.Put(keyInfo.VerKey, value)
err = db.MaybeCommitBatch()
return 1, err
}
func (db *RockDB) setKV(ts int64, rawKey []byte, value []byte, duration int64) error {
table, key, err := convertRedisKeyToDBKVKey(rawKey)
if err != nil {
return err
} else if err = checkValueSize(value); err != nil {
return err
}
if db.cfg.EnableTableCounter {
found := false
if !db.cfg.EstimateTableCounter {
found, _ = db.ExistNoLock(key)
}
if !found {
db.IncrTableKeyCount(table, 1, db.wb)
}
}
value, err = db.resetWithNewKVValue(ts, rawKey, value, duration, db.wb)
if err != nil {
return err
}
db.wb.Put(key, value)
err = db.MaybeCommitBatch()
return err
}
func (db *RockDB) KVGetSet(ts int64, rawKey []byte, value []byte) ([]byte, error) {
if err := checkValueSize(value); err != nil {
return nil, err
}
keyInfo, realOldV, err := db.getDBKVRealValueAndHeader(ts, rawKey, false)
if err != nil {
return nil, err
}
if realOldV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
} else if keyInfo.Expired {
realOldV = nil
}
value, err = db.resetWithNewKVValue(ts, rawKey, value, 0, db.wb)
if err != nil {
return nil, err
}
db.wb.Put(keyInfo.VerKey, value)
err = db.MaybeCommitBatch()
if err != nil {
return nil, err
}
if realOldV == nil {
return nil, nil
}
return realOldV, nil
}
func (db *RockDB) SetEx(ts int64, rawKey []byte, duration int64, value []byte) error {
if duration <= 0 {
return errInvalidTTL
}
return db.setKV(ts, rawKey, value, duration)
}
func (db *RockDB) SetNX(ts int64, rawKey []byte, value []byte) (int64, error) {
return db.KVSetWithOpts(ts, rawKey, value, 0, true, false)
}
func (db *RockDB) SetIfEQ(ts int64, rawKey []byte, oldV []byte, value []byte, duration int64) (int64, error) {
if err := checkValueSize(value); err != nil {
return 0, err
}
keyInfo, realV, err := db.prepareKVValueForWrite(ts, rawKey, false)
if err != nil {
return 0, err
}
var n int64 = 1
if !bytes.Equal(realV, oldV) && !keyInfo.Expired {
n = 0
} else {
if realV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
// prepare for write will renew the expire data on expired value,
// however, we still need del the old expire meta data since it may store the
// expire meta data in different place under different expire policy.
value, err = db.resetWithNewKVValue(ts, rawKey, value, duration, db.wb)
db.wb.Put(keyInfo.VerKey, value)
err = db.MaybeCommitBatch()
}
return n, err
}
func (db *RockDB) DelIfEQ(ts int64, rawKey []byte, oldV []byte) (int64, error) {
keyInfo, realV, err := db.prepareKVValueForWrite(ts, rawKey, false)
if err != nil {
return 0, err
}
var n int64 = 1
if !bytes.Equal(realV, oldV) && !keyInfo.Expired {
n = 0
} else {
return db.DelKeys(rawKey)
}
return n, err
}
func (db *RockDB) SetRange(ts int64, rawKey []byte, offset int, value []byte) (int64, error) {
if len(value) == 0 {
return 0, nil
}
if len(value)+offset > MaxValueSize {
return 0, errValueSize
}
keyInfo, realV, err := db.prepareKVValueForWrite(ts, rawKey, false)
if err != nil {
return 0, err
}
if realV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
extra := offset + len(value) - len(realV)
if extra > 0 {
realV = append(realV, make([]byte, extra)...)
}
copy(realV[offset:], value)
retn := len(realV)
realV = db.encodeRealValueToDBRawValue(ts, keyInfo.OldHeader, realV)
db.wb.Put(keyInfo.VerKey, realV)
err = db.CommitBatchWrite()
if err != nil {
return 0, err
}
return int64(retn), nil
}
func getRange(start int64, end int64, valLen int64) (int64, int64) {
if start < 0 {
start = valLen + start
}
if end < 0 {
end = valLen + end
}
if start < 0 {
start = 0
}
if end < 0 {
end = 0
}
if end >= valLen {
end = valLen - 1
}
return start, end
}
func (db *RockDB) GetRange(key []byte, start int64, end int64) ([]byte, error) {
value, err := db.KVGet(key)
if err != nil {
return nil, err
}
valLen := int64(len(value))
start, end = getRange(start, end, valLen)
if start > end {
return nil, nil
}
return value[start : end+1], nil
}
func (db *RockDB) StrLen(key []byte) (int64, error) {
v, err := db.KVGet(key)
if err != nil {
return 0, err
}
n := len(v)
return int64(n), nil
}
func (db *RockDB) Append(ts int64, rawKey []byte, value []byte) (int64, error) {
if len(value) == 0 {
return 0, nil
}
keyInfo, realV, err := db.prepareKVValueForWrite(ts, rawKey, false)
if err != nil {
return 0, err
}
if len(realV)+len(value) > MaxValueSize {
return 0, errValueSize
}
if realV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
newLen := len(realV) + len(value)
realV = append(realV, value...)
dbv := db.encodeRealValueToDBRawValue(ts, keyInfo.OldHeader, realV)
// TODO: do we need make sure delete the old expire meta to avoid expire the rewritten new data?
db.wb.Put(keyInfo.VerKey, dbv)
err = db.CommitBatchWrite()
if err != nil {
return 0, err
}
return int64(newLen), nil
}
// BitSet set the bitmap data with format as below:
// key -> 0(first bit) 0 0 0 0 0 0 0 (last bit) | (second byte with 8 bits) | .... | (last byte with 8bits) at most MaxBitOffset/8 bytes for each bitmap
func (db *RockDB) BitSetOld(ts int64, key []byte, offset int64, on int) (int64, error) {
if offset > MaxBitOffset || offset < 0 {
return 0, ErrBitOverflow
}
if (on & ^1) != 0 {
return 0, fmt.Errorf("bit should be 0 or 1, got %d", on)
}
keyInfo, realV, err := db.prepareKVValueForWrite(ts, key, false)
if err != nil {
return 0, err
}
if realV == nil && !keyInfo.Expired {
db.IncrTableKeyCount(keyInfo.Table, 1, db.wb)
}
if keyInfo.Expired {
realV = nil
}
byteOffset := int(uint32(offset) >> 3)
expandLen := byteOffset + 1 - len(realV)
if expandLen > 0 {
if on == 0 {
// not changed
return 0, nil
}
realV = append(realV, make([]byte, expandLen)...)
}
byteVal := realV[byteOffset]
bit := 7 - uint8(uint32(offset)&0x7)
oldBit := byteVal & (1 << bit)
byteVal &= ^(1 << bit)
byteVal |= (uint8(on&0x1) << bit)
realV[byteOffset] = byteVal
realV = db.encodeRealValueToDBRawValue(ts, keyInfo.OldHeader, realV)
db.wb.Put(keyInfo.VerKey, realV)
err = db.CommitBatchWrite()
if err != nil {
return 0, err
}
if oldBit > 0 {
return 1, nil
}
return 0, nil
}
func popcountBytes(s []byte) (count int64) {
for i := 0; i+8 <= len(s); i += 8 {
x := binary.LittleEndian.Uint64(s[i:])
count += int64(bits.OnesCount64(x))
}
s = s[len(s)&^7:]
if len(s) >= 4 {
count += int64(bits.OnesCount32(binary.LittleEndian.Uint32(s)))
s = s[4:]
}
if len(s) >= 2 {
count += int64(bits.OnesCount16(binary.LittleEndian.Uint16(s)))
s = s[2:]
}
if len(s) == 1 {
count += int64(bits.OnesCount8(s[0]))
}
return
}
func (db *RockDB) bitGetOld(key []byte, offset int64) (int64, error) {
v, err := db.KVGet(key)
if err != nil {
return 0, err
}
byteOffset := (uint32(offset) >> 3)
if byteOffset >= uint32(len(v)) {
return 0, nil
}
byteVal := v[byteOffset]
bit := 7 - uint8(uint32(offset)&0x7)
oldBit := byteVal & (1 << bit)
if oldBit > 0 {
return 1, nil
}
return 0, nil
}
func (db *RockDB) bitCountOld(key []byte, start, end int64) (int64, error) {
v, err := db.KVGet(key)
if err != nil {
return 0, err
}
start, end = getRange(start, end, int64(len(v)))
if start > end {
return 0, nil
}
v = v[start : end+1]
return popcountBytes(v), nil
}
func (db *RockDB) Expire(ts int64, rawKey []byte, duration int64) (int64, error) {
_, _, v, expired, err := db.getRawDBKVValue(ts, rawKey, false)
if err != nil || v == nil || expired {
return 0, err
}
return db.ExpireAt(KVType, rawKey, v, ts/int64(time.Second)+duration)
}
func (db *RockDB) Persist(ts int64, rawKey []byte) (int64, error) {
_, _, v, expired, err := db.getRawDBKVValue(ts, rawKey, false)
if err != nil {
return 0, err
}
if v == nil || expired {
return 0, nil
}
return db.ExpireAt(KVType, rawKey, v, 0)
}