Golang WriteBatch.Put方法代码示例

func Sadd(args [][]byte, wb *levigo.WriteBatch) interface{} {
	var newMembers uint32
	key := NewKeyBuffer(SetKey, args[0], len(args[1]))
	mk := metaKey(args[0])
	card, err := scard(mk, nil)
	if err != nil {
		return err
	}

	for _, member := range args[1:] {
		key.SetSuffix(member)
		if card > 0 {
			res, err := DB.Get(DefaultReadOptions, key.Key())
			if err != nil {
				return err
			}
			if res != nil {
				continue
			}
		}
		wb.Put(key.Key(), []byte{})
		newMembers++
	}
	if newMembers > 0 {
		setCard(mk, card+newMembers, wb)
	}
	return newMembers
}

func lpush(args [][]byte, left bool, create bool, wb *levigo.WriteBatch) (interface{}, error) {
	mk := metaKey(args[0])
	l, err := llen(mk, nil)
	if err != nil {
		return nil, err
	}
	if create || l.length > 0 {
		key := NewKeyBuffer(ListKey, args[0], 8)
		for _, value := range args[1:] {
			l.length++
			var seq int64
			if left {
				seq = l.left
				l.left--
			} else {
				seq = l.right
				l.right++
			}
			// To sort negative ints in order before positive, we subtract math.MinInt64
			// which wraps the numbers around and sorts correctly
			binary.BigEndian.PutUint64(key.SuffixForRead(8), uint64(seq-math.MinInt64))
			wb.Put(key.Key(), value)
		}
		setLlen(mk, l, wb)
	}
	return l.length, nil
}

func Hincrbyfloat(args [][]byte, wb *levigo.WriteBatch) interface{} {
	mk := metaKey(args[0])
	length, err := hlen(mk, nil)
	if err != nil {
		return err
	}
	key := NewKeyBufferWithSuffix(HashKey, args[0], args[1]).Key()
	res, err := DB.Get(DefaultReadOptions, key)
	if err != nil {
		return err
	}

	var current float64
	if res != nil {
		current, err = bconv.ParseFloat(res, 64)
		if err != nil {
			return fmt.Errorf("hash value is not a valid float")
		}
	}
	increment, err := bconv.ParseFloat(args[2], 64)
	if err != nil {
		return fmt.Errorf("value is not a valid float")
	}
	result := strconv.AppendFloat(nil, current+increment, 'f', -1, 64)
	wb.Put(key, result)

	// if is a new key, increment the hash length
	if res == nil {
		setHlen(mk, length+1, wb)
	}
	return result
}

func Hincrby(args [][]byte, wb *levigo.WriteBatch) interface{} {
	mk := metaKey(args[0])
	length, err := hlen(mk, nil)
	if err != nil {
		return err
	}
	key := NewKeyBufferWithSuffix(HashKey, args[0], args[1]).Key()
	res, err := DB.Get(DefaultReadOptions, key)
	if err != nil {
		return err
	}

	var current int64
	if res != nil {
		current, err = bconv.ParseInt(res, 10, 64)
		if err != nil {
			return InvalidIntError
		}
	}
	increment, err := bconv.ParseInt(args[2], 10, 64)
	if err != nil {
		return InvalidIntError
	}
	result := strconv.AppendInt(nil, current+increment, 10)
	wb.Put(key, result)

	// if is a new key, increment the hash length
	if res == nil {
		setHlen(mk, length+1, wb)
	}
	return result
}

func Hmset(args [][]byte, wb *levigo.WriteBatch) interface{} {
	if (len(args)-1)%2 != 0 {
		return fmt.Errorf("wrong number of arguments for 'hmset' command")
	}

	mk := metaKey(args[0])
	length, err := hlen(mk, nil)
	if err != nil {
		return err
	}

	var added uint32
	key := NewKeyBuffer(HashKey, args[0], len(args[1]))
	for i := 1; i < len(args); i += 2 {
		key.SetSuffix(args[i])
		var res []byte
		if length > 0 {
			res, err = DB.Get(DefaultReadOptions, key.Key())
			if err != nil {
				return err
			}
		}
		if res == nil {
			added++
		}
		wb.Put(key.Key(), args[i+1])
	}
	if added > 0 {
		setHlen(mk, length+added, wb)
	}
	return ReplyOK
}

func setLlen(key []byte, l *listDetails, wb *levigo.WriteBatch) {
	data := make([]byte, 22)
	data[0] = ListLengthValue
	binary.BigEndian.PutUint32(data[1:], l.length)
	data[5] = l.flags
	binary.BigEndian.PutUint64(data[6:], uint64(l.left))
	binary.BigEndian.PutUint64(data[14:], uint64(l.right))
	wb.Put(key, data)
}

func AddIndex(index [2]string, key []byte, indexDb *levigo.DB, wb *levigo.WriteBatch) error {
	searchKey := []byte(index[0] + "~" + index[1])
	keys, err := indexDb.Get(LReadOptions, searchKey)
	if err != nil {
		return err
	}
	keys = appendDataKey(keys, key)
	wb.Put(searchKey, keys)
	return nil
}

func combineSet(keys [][]byte, op int, wb *levigo.WriteBatch) interface{} {
	var count uint32
	res := []interface{}{}
	members := make(chan *iterSetMember)
	var storeKey *KeyBuffer
	var mk []byte

	if wb != nil {
		mk = metaKey(keys[0])
		_, err := delKey(mk, wb)
		if err != nil {
			return err
		}
		storeKey = NewKeyBuffer(SetKey, keys[0], 0)
		keys = keys[1:]
	}

	go multiSetIter(keys, members, op != setUnion)

combine:
	for m := range members {
		switch op {
		case setInter:
			for _, k := range m.exists {
				if !k {
					continue combine
				}
			}
		case setDiff:
			for i, k := range m.exists {
				if i == 0 && !k || i > 0 && k {
					continue combine
				}
			}
		}
		if wb != nil {
			storeKey.SetSuffix(m.member)
			wb.Put(storeKey.Key(), []byte{})
			count++
		} else {
			res = append(res, m.member)
		}
	}

	if wb != nil {
		if count > 0 {
			setCard(mk, count, wb)
		}
		return count
	}

	return res
}

// TODO: refactor with above.
func RemoveIndex(index [2]string, key []byte, indexDb *levigo.DB, wb *levigo.WriteBatch) error {
	searchKey := []byte(index[0] + "~" + index[1])
	keys, err := indexDb.Get(LReadOptions, searchKey)
	if err != nil {
		return err
	}
	keys = removeDataKey(keys, key)
	if len(keys) > 0 {
		wb.Put(searchKey, keys)
	} else {
		wb.Delete(searchKey)
	}
	return nil
}

func set(k []byte, v []byte, wb *levigo.WriteBatch) error {
	mk := metaKey(k)
	res, err := DB.Get(DefaultReadOptions, mk)
	if err != nil {
		return err
	}

	// If there is a non-string key here, let's delete it first
	if len(res) > 0 && res[0] != StringLengthValue {
		del(k, res[0], wb)
	}

	setStringLen(mk, len(v), wb)
	wb.Put(stringKey(k), v)

	return nil
}

func hset(args [][]byte, overwrite bool, wb *levigo.WriteBatch) interface{} {
	mk := metaKey(args[0])
	length, err := hlen(mk, nil)
	if err != nil {
		return err
	}
	var res []byte
	key := NewKeyBufferWithSuffix(HashKey, args[0], args[1]).Key()
	if length > 0 {
		res, err = DB.Get(DefaultReadOptions, key)
		if err != nil {
			return err
		}
	}
	if overwrite || res == nil {
		wb.Put(key, args[2])
	}
	if res == nil {
		setHlen(mk, length+1, wb)
		return 1
	}
	return 0
}

func setCard(key []byte, card uint32, wb *levigo.WriteBatch) {
	data := make([]byte, 5)
	data[0] = SetCardValue
	binary.BigEndian.PutUint32(data[1:], card)
	wb.Put(key, data)
}

func zadd(args [][]byte, wb *levigo.WriteBatch, incr bool) interface{} {
	var newMembers uint32
	var score float64
	scoreBytes := make([]byte, 8)
	setKey := NewKeyBuffer(ZSetKey, args[0], len(args[2]))
	scoreKey := NewKeyBuffer(ZScoreKey, args[0], 8+len(args[2]))

	mk := metaKey(args[0])
	card, err := zcard(mk, nil)
	if err != nil {
		return err
	}

	// Iterate through each of the score/member pairs
	for i := 1; i < len(args); i += 2 {
		var err error
		score, err = bconv.ParseFloat(args[i], 64)
		if err != nil {
			return fmt.Errorf("'%s' is not a valid float", string(args[1]))
		}

		// Check if the member exists
		setKey.SetSuffix(args[i+1])
		var res []byte
		if card > 0 {
			res, err = DB.Get(DefaultReadOptions, setKey.Key())
			if err != nil {
				return err
			}
		}

		// set the score key with 8 empty bytes before the member for the score
		setZScoreKeyMember(scoreKey, args[i+1])
		if res != nil { // We got a score from the db, so the member already exists
			if len(res) != 8 {
				return InvalidDataError
			}
			actualScore := math.Float64frombits(binary.BigEndian.Uint64(res))
			if incr { // this is a ZINCRBY, so increment the score
				score += actualScore
			}
			if score == actualScore { // Member already exists with the same score, do nothing
				continue
			}

			// Delete score key for member
			setZScoreKeyScore(scoreKey, actualScore)
			wb.Delete(scoreKey.Key())
		} else { // No score found, we're adding a new member
			newMembers++
		}

		// Store the set and score keys
		binary.BigEndian.PutUint64(scoreBytes, math.Float64bits(score))
		setZScoreKeyScore(scoreKey, score)
		wb.Put(setKey.Key(), scoreBytes)
		wb.Put(scoreKey.Key(), []byte{}) // The score key is only used for sorting, the value is empty
	}

	// Update the set metadata with the new cardinality
	if newMembers > 0 {
		setZcard(mk, card+newMembers, wb)
	}

	if incr { // This is a ZINCRBY, return the new score
		return ftoa(score)
	}
	return newMembers
}

//.........这里部分代码省略.........
	}

	aggregate := zsetAggSum
	weights := make([]float64, numKeys)
	scores := make([]float64, 0, numKeys)
	for i := 0; i < numKeys; i++ {
		weights[i] = 1
	}

	argOffset := 2 + numKeys
	if len(args) > argOffset {
		if len(args) > argOffset+numKeys {
			if EqualIgnoreCase(args[argOffset], []byte("weights")) {
				argOffset += numKeys + 1
				for i, w := range args[numKeys+3 : argOffset] {
					weights[i], err = bconv.ParseFloat(w, 64)
					if err != nil {
						return fmt.Errorf("weight value is not a float")
					}
				}
			} else {
				return SyntaxError
			}
		}
		if len(args) > argOffset {
			if len(args) == argOffset+2 && EqualIgnoreCase(args[argOffset], []byte("aggregate")) {
				agg := bytes.ToLower(args[argOffset+1])
				switch {
				case bytes.Equal(agg, []byte("sum")):
					aggregate = zsetAggSum
				case bytes.Equal(agg, []byte("min")):
					aggregate = zsetAggMin
				case bytes.Equal(agg, []byte("max")):
					aggregate = zsetAggMax
				default:
					return SyntaxError
				}
			} else {
				return SyntaxError
			}
		}
	}

	go multiZsetIter(args[2:numKeys+2], members, op != zsetUnion)

combine:
	for m := range members {
		if op == zsetInter {
			for _, k := range m.exists {
				if !k {
					continue combine
				}
			}
		}

		scores = scores[:0]
		for i, k := range m.exists {
			if k {
				scores = append(scores, m.scores[i])
			}
		}
		var score float64
		for i, s := range scores {
			scores[i] = s * weights[i]
		}
		switch aggregate {
		case zsetAggSum:
			for _, s := range scores {
				score += s
			}
		case zsetAggMin:
			sort.Float64s(scores)
			score = scores[0]
		case zsetAggMax:
			sort.Float64s(scores)
			score = scores[len(scores)-1]
		}

		if wb != nil {
			setKey.SetSuffix(m.member)
			binary.BigEndian.PutUint64(scoreBytes, math.Float64bits(score))
			setZScoreKeyMember(scoreKey, m.member)
			setZScoreKeyScore(scoreKey, score)
			wb.Put(setKey.Key(), scoreBytes)
			wb.Put(scoreKey.Key(), []byte{})
			count++
		} else {
			res = append(res, m.member, ftoa(score))
		}
	}

	if wb != nil {
		if count > 0 {
			setZcard(mk, count, wb)
		}
		return count
	}

	return res
}

func setHlen(key []byte, length uint32, wb *levigo.WriteBatch) {
	data := make([]byte, 5)
	data[0] = HashLengthValue
	binary.BigEndian.PutUint32(data[1:], length)
	wb.Put(key, data)
}