forked from mirror/ledisdb
557 lines
10 KiB
Go
557 lines
10 KiB
Go
package ledis
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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/ledisdb/ledisdb/store"
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"github.com/siddontang/go/num"
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)
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// FVPair is the pair of field and value.
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type FVPair struct {
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Field []byte
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Value []byte
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}
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var errHashKey = errors.New("invalid hash key")
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var errHSizeKey = errors.New("invalid hsize key")
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const (
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hashStartSep byte = ':'
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hashStopSep byte = hashStartSep + 1
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)
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func checkHashKFSize(key []byte, field []byte) error {
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if len(key) > MaxKeySize || len(key) == 0 {
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return errKeySize
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} else if len(field) > MaxHashFieldSize || len(field) == 0 {
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return errHashFieldSize
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}
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return nil
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}
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func (db *DB) hEncodeSizeKey(key []byte) []byte {
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buf := make([]byte, len(key)+1+len(db.indexVarBuf))
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pos := 0
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n := copy(buf, db.indexVarBuf)
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pos += n
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buf[pos] = HSizeType
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pos++
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copy(buf[pos:], key)
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return buf
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}
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func (db *DB) hDecodeSizeKey(ek []byte) ([]byte, error) {
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pos, err := db.checkKeyIndex(ek)
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if err != nil {
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return nil, err
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}
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if pos+1 > len(ek) || ek[pos] != HSizeType {
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return nil, errHSizeKey
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}
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pos++
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return ek[pos:], nil
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}
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func (db *DB) hEncodeHashKey(key []byte, field []byte) []byte {
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buf := make([]byte, len(key)+len(field)+1+1+2+len(db.indexVarBuf))
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pos := 0
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n := copy(buf, db.indexVarBuf)
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pos += n
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buf[pos] = HashType
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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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buf[pos] = hashStartSep
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pos++
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copy(buf[pos:], field)
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return buf
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}
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func (db *DB) hDecodeHashKey(ek []byte) ([]byte, []byte, error) {
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pos, err := db.checkKeyIndex(ek)
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if err != nil {
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return nil, nil, err
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}
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if pos+1 > len(ek) || ek[pos] != HashType {
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return nil, nil, errHashKey
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}
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pos++
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if pos+2 > len(ek) {
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return nil, nil, errHashKey
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}
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keyLen := int(binary.BigEndian.Uint16(ek[pos:]))
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pos += 2
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if keyLen+pos > len(ek) {
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return nil, nil, errHashKey
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}
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key := ek[pos : pos+keyLen]
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pos += keyLen
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if ek[pos] != hashStartSep {
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return nil, nil, errHashKey
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}
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pos++
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field := ek[pos:]
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return key, field, nil
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}
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func (db *DB) hEncodeStartKey(key []byte) []byte {
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return db.hEncodeHashKey(key, nil)
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}
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func (db *DB) hEncodeStopKey(key []byte) []byte {
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k := db.hEncodeHashKey(key, nil)
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k[len(k)-1] = hashStopSep
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return k
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}
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func (db *DB) hSetItem(key []byte, field []byte, value []byte) (int64, error) {
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t := db.hashBatch
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ek := db.hEncodeHashKey(key, field)
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var n int64 = 1
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if v, _ := db.bucket.Get(ek); v != nil {
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n = 0
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} else {
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if _, err := db.hIncrSize(key, 1); err != nil {
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return 0, err
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}
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}
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t.Put(ek, value)
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return n, nil
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}
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// ps : here just focus on deleting the hash data,
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// any other likes expire is ignore.
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func (db *DB) hDelete(t *batch, key []byte) int64 {
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sk := db.hEncodeSizeKey(key)
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start := db.hEncodeStartKey(key)
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stop := db.hEncodeStopKey(key)
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var num int64
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it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
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for ; it.Valid(); it.Next() {
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t.Delete(it.Key())
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num++
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}
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it.Close()
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t.Delete(sk)
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return num
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}
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func (db *DB) hExpireAt(key []byte, when int64) (int64, error) {
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t := db.hashBatch
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t.Lock()
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defer t.Unlock()
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if hlen, err := db.HLen(key); err != nil || hlen == 0 {
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return 0, err
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}
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db.expireAt(t, HashType, 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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return 1, nil
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}
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// HLen returns the lengh of hash.
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func (db *DB) HLen(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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return Int64(db.bucket.Get(db.hEncodeSizeKey(key)))
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}
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// HSet sets the field with value of key.
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func (db *DB) HSet(key []byte, field []byte, value []byte) (int64, error) {
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if err := checkHashKFSize(key, field); err != nil {
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return 0, err
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} else if err := checkValueSize(value); err != nil {
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return 0, err
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}
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t := db.hashBatch
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t.Lock()
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defer t.Unlock()
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n, err := db.hSetItem(key, field, value)
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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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// HGet gets the value of the field.
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func (db *DB) HGet(key []byte, field []byte) ([]byte, error) {
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if err := checkHashKFSize(key, field); err != nil {
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return nil, err
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}
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return db.bucket.Get(db.hEncodeHashKey(key, field))
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}
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// HMset sets multi field-values.
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func (db *DB) HMset(key []byte, args ...FVPair) error {
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t := db.hashBatch
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t.Lock()
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defer t.Unlock()
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var err error
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var ek []byte
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var num int64
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for i := 0; i < len(args); i++ {
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if err := checkHashKFSize(key, args[i].Field); err != nil {
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return err
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} else if err := checkValueSize(args[i].Value); err != nil {
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return err
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}
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ek = db.hEncodeHashKey(key, args[i].Field)
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if v, err := db.bucket.Get(ek); err != nil {
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return err
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} else if v == nil {
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num++
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}
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t.Put(ek, args[i].Value)
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}
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if _, err = db.hIncrSize(key, num); err != nil {
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return err
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}
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//todo add binglog
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err = t.Commit()
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return err
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}
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// HMget gets multi values of fields
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func (db *DB) HMget(key []byte, args ...[]byte) ([][]byte, error) {
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var ek []byte
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it := db.bucket.NewIterator()
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defer it.Close()
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r := make([][]byte, len(args))
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for i := 0; i < len(args); i++ {
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if err := checkHashKFSize(key, args[i]); err != nil {
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return nil, err
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}
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ek = db.hEncodeHashKey(key, args[i])
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r[i] = it.Find(ek)
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}
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return r, nil
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}
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// HDel deletes the fields.
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func (db *DB) HDel(key []byte, args ...[]byte) (int64, error) {
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t := db.hashBatch
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var ek []byte
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var v []byte
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var err error
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t.Lock()
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defer t.Unlock()
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it := db.bucket.NewIterator()
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defer it.Close()
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var num int64
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for i := 0; i < len(args); i++ {
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if err := checkHashKFSize(key, args[i]); err != nil {
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return 0, err
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}
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ek = db.hEncodeHashKey(key, args[i])
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v = it.RawFind(ek)
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if v == nil {
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continue
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} else {
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num++
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t.Delete(ek)
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}
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}
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if _, err = db.hIncrSize(key, -num); 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 num, err
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}
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func (db *DB) hIncrSize(key []byte, delta int64) (int64, error) {
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t := db.hashBatch
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sk := db.hEncodeSizeKey(key)
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var err error
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var size int64
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if size, err = Int64(db.bucket.Get(sk)); err != nil {
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return 0, err
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}
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size += delta
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if size <= 0 {
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size = 0
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t.Delete(sk)
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db.rmExpire(t, HashType, key)
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} else {
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t.Put(sk, PutInt64(size))
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}
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return size, nil
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}
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// HIncrBy increases the value of field by delta.
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func (db *DB) HIncrBy(key []byte, field []byte, delta int64) (int64, error) {
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if err := checkHashKFSize(key, field); err != nil {
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return 0, err
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}
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t := db.hashBatch
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var ek []byte
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var err error
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t.Lock()
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defer t.Unlock()
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ek = db.hEncodeHashKey(key, field)
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var n int64
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if n, err = StrInt64(db.bucket.Get(ek)); err != nil {
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return 0, err
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}
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n += delta
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_, err = db.hSetItem(key, field, num.FormatInt64ToSlice(n))
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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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// HGetAll returns all field-values.
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func (db *DB) HGetAll(key []byte) ([]FVPair, 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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start := db.hEncodeStartKey(key)
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stop := db.hEncodeStopKey(key)
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v := make([]FVPair, 0, 16)
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it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
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defer it.Close()
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for ; it.Valid(); it.Next() {
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_, f, err := db.hDecodeHashKey(it.Key())
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if err != nil {
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return nil, err
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}
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v = append(v, FVPair{Field: f, Value: it.Value()})
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}
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return v, nil
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}
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// HKeys returns the all fields.
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func (db *DB) HKeys(key []byte) ([][]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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start := db.hEncodeStartKey(key)
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stop := db.hEncodeStopKey(key)
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v := make([][]byte, 0, 16)
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it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
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defer it.Close()
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for ; it.Valid(); it.Next() {
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_, f, err := db.hDecodeHashKey(it.Key())
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if err != nil {
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return nil, err
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}
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v = append(v, f)
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}
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return v, nil
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}
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// HValues returns all values
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func (db *DB) HValues(key []byte) ([][]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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start := db.hEncodeStartKey(key)
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stop := db.hEncodeStopKey(key)
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v := make([][]byte, 0, 16)
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it := db.bucket.RangeLimitIterator(start, stop, store.RangeROpen, 0, -1)
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defer it.Close()
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for ; it.Valid(); it.Next() {
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_, _, err := db.hDecodeHashKey(it.Key())
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if err != nil {
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return nil, err
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}
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v = append(v, it.Value())
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}
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return v, nil
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}
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// HClear clears the data.
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func (db *DB) HClear(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.hashBatch
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t.Lock()
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defer t.Unlock()
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num := db.hDelete(t, key)
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db.rmExpire(t, HashType, key)
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err := t.Commit()
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return num, err
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}
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// HMclear cleans multi data.
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func (db *DB) HMclear(keys ...[]byte) (int64, error) {
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t := db.hashBatch
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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.hDelete(t, key)
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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 int64(len(keys)), err
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}
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func (db *DB) hFlush() (drop int64, err error) {
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t := db.hashBatch
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t.Lock()
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defer t.Unlock()
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return db.flushType(t, HashType)
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}
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// HExpire expires the data with duration.
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func (db *DB) HExpire(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.hExpireAt(key, time.Now().Unix()+duration)
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}
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// HExpireAt expires the data at time when.
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func (db *DB) HExpireAt(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.hExpireAt(key, when)
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}
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// HTTL gets the TTL of data.
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func (db *DB) HTTL(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(HashType, key)
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}
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// HPersist removes the TTL of data.
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func (db *DB) HPersist(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.hashBatch
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t.Lock()
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defer t.Unlock()
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n, err := db.rmExpire(t, HashType, 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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// HKeyExists checks whether data exists or not.
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func (db *DB) HKeyExists(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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sk := db.hEncodeSizeKey(key)
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v, err := db.bucket.Get(sk)
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if v != nil && err == nil {
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return 1, nil
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}
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return 0, err
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}
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