mirror of
https://github.com/go-gitea/gitea
synced 2024-11-14 14:14:25 +00:00
493 lines
9.0 KiB
Go
493 lines
9.0 KiB
Go
package nodb
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import (
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"encoding/binary"
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"errors"
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"time"
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"github.com/lunny/nodb/store"
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)
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const (
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listHeadSeq int32 = 1
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listTailSeq int32 = 2
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listMinSeq int32 = 1000
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listMaxSeq int32 = 1<<31 - 1000
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listInitialSeq int32 = listMinSeq + (listMaxSeq-listMinSeq)/2
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)
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var errLMetaKey = errors.New("invalid lmeta key")
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var errListKey = errors.New("invalid list key")
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var errListSeq = errors.New("invalid list sequence, overflow")
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func (db *DB) lEncodeMetaKey(key []byte) []byte {
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buf := make([]byte, len(key)+2)
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buf[0] = db.index
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buf[1] = LMetaType
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copy(buf[2:], key)
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return buf
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}
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func (db *DB) lDecodeMetaKey(ek []byte) ([]byte, error) {
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if len(ek) < 2 || ek[0] != db.index || ek[1] != LMetaType {
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return nil, errLMetaKey
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}
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return ek[2:], nil
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}
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func (db *DB) lEncodeListKey(key []byte, seq int32) []byte {
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buf := make([]byte, len(key)+8)
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pos := 0
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buf[pos] = db.index
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pos++
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buf[pos] = ListType
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pos++
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binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
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pos += 2
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copy(buf[pos:], key)
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pos += len(key)
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binary.BigEndian.PutUint32(buf[pos:], uint32(seq))
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return buf
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}
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func (db *DB) lDecodeListKey(ek []byte) (key []byte, seq int32, err error) {
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if len(ek) < 8 || ek[0] != db.index || ek[1] != ListType {
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err = errListKey
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return
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}
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keyLen := int(binary.BigEndian.Uint16(ek[2:]))
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if keyLen+8 != len(ek) {
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err = errListKey
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return
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}
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key = ek[4 : 4+keyLen]
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seq = int32(binary.BigEndian.Uint32(ek[4+keyLen:]))
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return
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}
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func (db *DB) lpush(key []byte, whereSeq int32, args ...[]byte) (int64, error) {
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if err := checkKeySize(key); err != nil {
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return 0, err
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}
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var headSeq int32
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var tailSeq int32
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var size int32
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var err error
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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metaKey := db.lEncodeMetaKey(key)
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headSeq, tailSeq, size, err = db.lGetMeta(nil, metaKey)
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if err != nil {
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return 0, err
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}
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var pushCnt int = len(args)
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if pushCnt == 0 {
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return int64(size), nil
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}
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var seq int32 = headSeq
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var delta int32 = -1
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if whereSeq == listTailSeq {
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seq = tailSeq
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delta = 1
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}
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// append elements
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if size > 0 {
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seq += delta
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}
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for i := 0; i < pushCnt; i++ {
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ek := db.lEncodeListKey(key, seq+int32(i)*delta)
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t.Put(ek, args[i])
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}
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seq += int32(pushCnt-1) * delta
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if seq <= listMinSeq || seq >= listMaxSeq {
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return 0, errListSeq
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}
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// set meta info
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if whereSeq == listHeadSeq {
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headSeq = seq
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} else {
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tailSeq = seq
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}
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db.lSetMeta(metaKey, headSeq, tailSeq)
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err = t.Commit()
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return int64(size) + int64(pushCnt), err
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}
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func (db *DB) lpop(key []byte, whereSeq int32) ([]byte, error) {
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if err := checkKeySize(key); err != nil {
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return nil, err
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}
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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var headSeq int32
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var tailSeq int32
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var err error
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metaKey := db.lEncodeMetaKey(key)
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headSeq, tailSeq, _, err = db.lGetMeta(nil, metaKey)
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if err != nil {
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return nil, err
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}
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var value []byte
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var seq int32 = headSeq
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if whereSeq == listTailSeq {
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seq = tailSeq
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}
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itemKey := db.lEncodeListKey(key, seq)
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value, err = db.bucket.Get(itemKey)
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if err != nil {
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return nil, err
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}
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if whereSeq == listHeadSeq {
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headSeq += 1
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} else {
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tailSeq -= 1
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}
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t.Delete(itemKey)
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size := db.lSetMeta(metaKey, headSeq, tailSeq)
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if size == 0 {
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db.rmExpire(t, HashType, key)
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}
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err = t.Commit()
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return value, err
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}
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// ps : here just focus on deleting the list data,
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// any other likes expire is ignore.
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func (db *DB) lDelete(t *batch, key []byte) int64 {
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mk := db.lEncodeMetaKey(key)
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var headSeq int32
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var tailSeq int32
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var err error
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it := db.bucket.NewIterator()
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defer it.Close()
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headSeq, tailSeq, _, err = db.lGetMeta(it, mk)
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if err != nil {
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return 0
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}
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var num int64 = 0
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startKey := db.lEncodeListKey(key, headSeq)
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stopKey := db.lEncodeListKey(key, tailSeq)
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rit := store.NewRangeIterator(it, &store.Range{startKey, stopKey, store.RangeClose})
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for ; rit.Valid(); rit.Next() {
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t.Delete(rit.RawKey())
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num++
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}
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t.Delete(mk)
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return num
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}
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func (db *DB) lGetMeta(it *store.Iterator, ek []byte) (headSeq int32, tailSeq int32, size int32, err error) {
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var v []byte
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if it != nil {
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v = it.Find(ek)
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} else {
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v, err = db.bucket.Get(ek)
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}
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if err != nil {
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return
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} else if v == nil {
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headSeq = listInitialSeq
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tailSeq = listInitialSeq
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size = 0
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return
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} else {
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headSeq = int32(binary.LittleEndian.Uint32(v[0:4]))
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tailSeq = int32(binary.LittleEndian.Uint32(v[4:8]))
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size = tailSeq - headSeq + 1
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}
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return
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}
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func (db *DB) lSetMeta(ek []byte, headSeq int32, tailSeq int32) int32 {
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t := db.listBatch
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var size int32 = tailSeq - headSeq + 1
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if size < 0 {
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// todo : log error + panic
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} else if size == 0 {
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t.Delete(ek)
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} else {
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buf := make([]byte, 8)
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binary.LittleEndian.PutUint32(buf[0:4], uint32(headSeq))
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binary.LittleEndian.PutUint32(buf[4:8], uint32(tailSeq))
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t.Put(ek, buf)
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}
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return size
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}
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func (db *DB) lExpireAt(key []byte, when int64) (int64, error) {
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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if llen, err := db.LLen(key); err != nil || llen == 0 {
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return 0, err
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} else {
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db.expireAt(t, ListType, key, when)
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if err := t.Commit(); err != nil {
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return 0, err
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}
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}
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return 1, nil
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}
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func (db *DB) LIndex(key []byte, index int32) ([]byte, error) {
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if err := checkKeySize(key); err != nil {
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return nil, err
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}
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var seq int32
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var headSeq int32
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var tailSeq int32
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var err error
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metaKey := db.lEncodeMetaKey(key)
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it := db.bucket.NewIterator()
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defer it.Close()
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headSeq, tailSeq, _, err = db.lGetMeta(it, metaKey)
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if err != nil {
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return nil, err
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}
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if index >= 0 {
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seq = headSeq + index
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} else {
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seq = tailSeq + index + 1
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}
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sk := db.lEncodeListKey(key, seq)
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v := it.Find(sk)
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return v, nil
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}
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func (db *DB) LLen(key []byte) (int64, error) {
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if err := checkKeySize(key); err != nil {
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return 0, err
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}
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ek := db.lEncodeMetaKey(key)
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_, _, size, err := db.lGetMeta(nil, ek)
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return int64(size), err
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}
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func (db *DB) LPop(key []byte) ([]byte, error) {
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return db.lpop(key, listHeadSeq)
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}
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func (db *DB) LPush(key []byte, arg1 []byte, args ...[]byte) (int64, error) {
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var argss = [][]byte{arg1}
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argss = append(argss, args...)
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return db.lpush(key, listHeadSeq, argss...)
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}
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func (db *DB) LRange(key []byte, start int32, stop int32) ([][]byte, error) {
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if err := checkKeySize(key); err != nil {
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return nil, err
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}
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var headSeq int32
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var llen int32
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var err error
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metaKey := db.lEncodeMetaKey(key)
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it := db.bucket.NewIterator()
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defer it.Close()
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if headSeq, _, llen, err = db.lGetMeta(it, metaKey); err != nil {
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return nil, err
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}
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if start < 0 {
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start = llen + start
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}
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if stop < 0 {
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stop = llen + stop
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}
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if start < 0 {
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start = 0
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}
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if start > stop || start >= llen {
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return [][]byte{}, nil
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}
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if stop >= llen {
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stop = llen - 1
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}
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limit := (stop - start) + 1
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headSeq += start
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v := make([][]byte, 0, limit)
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startKey := db.lEncodeListKey(key, headSeq)
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rit := store.NewRangeLimitIterator(it,
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&store.Range{
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Min: startKey,
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Max: nil,
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Type: store.RangeClose},
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&store.Limit{
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Offset: 0,
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Count: int(limit)})
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for ; rit.Valid(); rit.Next() {
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v = append(v, rit.Value())
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}
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return v, nil
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}
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func (db *DB) RPop(key []byte) ([]byte, error) {
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return db.lpop(key, listTailSeq)
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}
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func (db *DB) RPush(key []byte, arg1 []byte, args ...[]byte) (int64, error) {
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var argss = [][]byte{arg1}
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argss = append(argss, args...)
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return db.lpush(key, listTailSeq, argss...)
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}
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func (db *DB) LClear(key []byte) (int64, error) {
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if err := checkKeySize(key); err != nil {
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return 0, err
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}
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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num := db.lDelete(t, key)
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db.rmExpire(t, ListType, key)
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err := t.Commit()
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return num, err
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}
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func (db *DB) LMclear(keys ...[]byte) (int64, error) {
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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for _, key := range keys {
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if err := checkKeySize(key); err != nil {
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return 0, err
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}
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db.lDelete(t, key)
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db.rmExpire(t, ListType, key)
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}
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err := t.Commit()
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return int64(len(keys)), err
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}
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func (db *DB) lFlush() (drop int64, err error) {
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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return db.flushType(t, ListType)
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}
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func (db *DB) LExpire(key []byte, duration int64) (int64, error) {
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if duration <= 0 {
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return 0, errExpireValue
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}
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return db.lExpireAt(key, time.Now().Unix()+duration)
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}
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func (db *DB) LExpireAt(key []byte, when int64) (int64, error) {
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if when <= time.Now().Unix() {
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return 0, errExpireValue
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}
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return db.lExpireAt(key, when)
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}
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func (db *DB) LTTL(key []byte) (int64, error) {
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if err := checkKeySize(key); err != nil {
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return -1, err
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}
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return db.ttl(ListType, key)
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}
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func (db *DB) LPersist(key []byte) (int64, error) {
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if err := checkKeySize(key); err != nil {
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return 0, err
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}
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t := db.listBatch
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t.Lock()
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defer t.Unlock()
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n, err := db.rmExpire(t, ListType, key)
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if err != nil {
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return 0, err
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}
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err = t.Commit()
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return n, err
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}
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func (db *DB) LScan(key []byte, count int, inclusive bool, match string) ([][]byte, error) {
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return db.scan(LMetaType, key, count, inclusive, match)
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}
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func (db *DB) lEncodeMinKey() []byte {
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return db.lEncodeMetaKey(nil)
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}
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func (db *DB) lEncodeMaxKey() []byte {
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ek := db.lEncodeMetaKey(nil)
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ek[len(ek)-1] = LMetaType + 1
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return ek
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}
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