forked from absolute8511/ZanRedisDB
/
t_collections.go
276 lines (243 loc) · 7.14 KB
/
t_collections.go
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package rockredis
import (
"encoding/binary"
"errors"
"time"
"github.com/youzan/ZanRedisDB/common"
)
const (
collStartSep byte = ':'
collStopSep byte = collStartSep + 1
collectionLengthForMetric int64 = 128
)
var (
errCollKey = errors.New("invalid collection key")
errCollTypeMismatch = errors.New("decoded collection type mismatch")
)
// note for list/bitmap/zscore subkey is different
func encodeCollSubKey(dt byte, table []byte, key []byte, subkey []byte) []byte {
if dt != HashType && dt != SetType && dt != ZSetType {
panic(errDataType)
}
buf := make([]byte, getDataTablePrefixBufLen(dt, table)+len(key)+len(subkey)+1+2)
pos := encodeDataTablePrefixToBuf(buf, dt, table)
binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
pos += 2
copy(buf[pos:], key)
pos += len(key)
buf[pos] = collStartSep
pos++
copy(buf[pos:], subkey)
return buf
}
// note for list/bitmap/zscore subkey is different
func decodeCollSubKey(dbk []byte) (byte, []byte, []byte, []byte, error) {
if len(dbk) < 0 {
return 0, nil, nil, nil, errDataType
}
dt := dbk[0]
if dt != HashType && dt != SetType && dt != ZSetType {
return dt, nil, nil, nil, errDataType
}
table, pos, err := decodeDataTablePrefixFromBuf(dbk, dt)
if err != nil {
return dt, nil, nil, nil, err
}
if pos+2 > len(dbk) {
return dt, nil, nil, nil, errCollKey
}
keyLen := int(binary.BigEndian.Uint16(dbk[pos:]))
pos += 2
if keyLen+pos > len(dbk) {
return dt, table, nil, nil, errCollKey
}
key := dbk[pos : pos+keyLen]
pos += keyLen
if dbk[pos] != collStartSep {
return dt, table, nil, nil, errCollKey
}
pos++
subkey := dbk[pos:]
return dt, table, key, subkey, nil
}
// decode the versioned collection key (in wait compact policy) and convert to raw redis key
func convertCollDBKeyToRawKey(dbk []byte) (byte, []byte, int64, error) {
if len(dbk) < 0 {
return 0, nil, 0, errDataType
}
dt := dbk[0]
var table []byte
var verk []byte
var err error
switch dt {
case HashType, SetType, ZSetType:
_, table, verk, _, err = decodeCollSubKey(dbk)
case ListType:
table, verk, _, err = lDecodeListKey(dbk)
case ZScoreType:
table, verk, _, _, err = zDecodeScoreKey(dbk)
case BitmapType:
table, verk, _, err = decodeBitmapKey(dbk)
default:
return 0, nil, 0, errDataType
}
if err != nil {
return dt, nil, 0, err
}
rk, ver, err := decodeVerKey(verk)
if err != nil {
return dt, nil, 0, err
}
rawKey := packRedisKey(table, rk)
return dt, rawKey, ver, nil
}
type collVerKeyInfo struct {
OldHeader *headerMetaValue
Expired bool
Table []byte
VerKey []byte
RangeStart []byte
RangeEnd []byte
}
// decoded meta for compatible with old format
func (info collVerKeyInfo) MetaData() []byte {
return info.OldHeader.UserData
}
func (info collVerKeyInfo) IsNotExistOrExpired() bool {
return info.Expired || info.MetaData() == nil
}
func checkCollKFSize(key []byte, field []byte) error {
return common.CheckKeySubKey(key, field)
}
func encodeMetaKey(dt byte, key []byte) ([]byte, error) {
switch dt {
case KVType:
key = encodeKVKey(key)
case HashType, HSizeType:
key = hEncodeSizeKey(key)
case SetType, SSizeType:
key = sEncodeSizeKey(key)
case BitmapType, BitmapMetaType:
key = bitEncodeMetaKey(key)
case ListType, LMetaType:
key = lEncodeMetaKey(key)
case ZSetType, ZSizeType, ZScoreType:
key = zEncodeSizeKey(key)
default:
return nil, errDataType
}
return key, nil
}
func (db *RockDB) getCollVerKeyForRange(ts int64, dt byte, key []byte, useLock bool) (collVerKeyInfo, error) {
info, err := db.GetCollVersionKey(ts, dt, key, useLock)
if err != nil {
return info, err
}
switch dt {
case SetType:
info.RangeStart = sEncodeStartKey(info.Table, info.VerKey)
info.RangeEnd = sEncodeStopKey(info.Table, info.VerKey)
case HashType:
info.RangeStart = hEncodeStartKey(info.Table, info.VerKey)
info.RangeEnd = hEncodeStopKey(info.Table, info.VerKey)
case ZSetType:
info.RangeStart = zEncodeStartKey(info.Table, info.VerKey)
info.RangeEnd = zEncodeStopKey(info.Table, info.VerKey)
default:
}
return info, nil
}
// if run in raft write loop should avoid lock.
func (db *RockDB) GetCollVersionKey(ts int64, dt byte, key []byte, useLock bool) (collVerKeyInfo, error) {
var keyInfo collVerKeyInfo
table, rk, err := extractTableFromRedisKey(key)
if err != nil {
return keyInfo, err
}
if len(table) == 0 {
return keyInfo, errTableName
}
keyInfo.Table = table
if err := checkKeySize(rk); err != nil {
return keyInfo, err
}
keyInfo.OldHeader, keyInfo.Expired, err = db.collHeaderMeta(ts, dt, key, useLock)
if err != nil {
return keyInfo, err
}
keyInfo.VerKey = db.expiration.encodeToVersionKey(dt, keyInfo.OldHeader, rk)
return keyInfo, nil
}
// note this may use write batch in db
func (db *RockDB) prepareCollKeyForWrite(ts int64, dt byte, key []byte, field []byte) (collVerKeyInfo, error) {
var keyInfo collVerKeyInfo
table, rk, err := extractTableFromRedisKey(key)
if err != nil {
return keyInfo, err
}
keyInfo.Table = table
if err := checkCollKFSize(rk, field); err != nil {
return keyInfo, err
}
keyInfo.OldHeader, keyInfo.Expired, err = db.collHeaderMeta(ts, dt, key, false)
if err != nil {
return keyInfo, err
}
if keyInfo.IsNotExistOrExpired() {
// since renew on expired may change the header meta in old header in some expire policy,
// then the renewed meta data should also be return for different expire policy
db.expiration.renewOnExpired(ts, dt, key, keyInfo.OldHeader)
}
keyInfo.VerKey = db.expiration.encodeToVersionKey(dt, keyInfo.OldHeader, rk)
return keyInfo, nil
}
// TODO: maybe we do not need read the meta if only expired is needed and we use the local_deletion policy,
// since the ttl is not available in local_deletion policy (can reduce 1 get to db)
func (db *RockDB) collHeaderMeta(ts int64, dt byte, key []byte, useLock bool) (*headerMetaValue, bool, error) {
var sizeKey []byte
sizeKey, err := encodeMetaKey(dt, key)
if err != nil {
return nil, false, err
}
var v []byte
if useLock {
v, err = db.GetBytes(sizeKey)
} else {
v, err = db.GetBytesNoLock(sizeKey)
}
if err != nil {
return nil, false, err
}
h, err := db.expiration.decodeRawValue(dt, v)
if err != nil {
return h, false, err
}
isExpired, err := db.expiration.isExpired(ts, dt, key, v, useLock)
return h, isExpired, err
}
func (db *RockDB) collKeyExists(dt byte, key []byte) (int64, error) {
h, expired, err := db.collHeaderMeta(time.Now().UnixNano(), dt, key, true)
if err != nil {
return 0, err
}
if expired || h.UserData == nil {
return 0, nil
}
return 1, nil
}
func (db *RockDB) collExpire(ts int64, dt byte, key []byte, duration int64) (int64, error) {
oldh, expired, err := db.collHeaderMeta(ts, dt, key, false)
if err != nil || expired || oldh.UserData == nil {
return 0, err
}
rawV := db.expiration.encodeToRawValue(dt, oldh)
return db.ExpireAt(dt, key, rawV, duration+ts/int64(time.Second))
}
func (db *RockDB) collPersist(ts int64, dt byte, key []byte) (int64, error) {
oldh, expired, err := db.collHeaderMeta(ts, dt, key, false)
if err != nil || expired || oldh.UserData == nil {
return 0, err
}
rawV := db.expiration.encodeToRawValue(dt, oldh)
return db.ExpireAt(dt, key, rawV, 0)
}