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/
hash.go
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/
hash.go
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package main
import (
"encoding/binary"
"fmt"
"strconv"
"github.com/jmhodges/levigo"
"github.com/titanous/bconv"
)
// Keys stored in LevelDB for hashes
//
// MetadataKey | key = HashLengthValue | count of fields uint32
//
// For each field:
// HashKey | key length uint32 | key | field = value
func Hset(args [][]byte, wb *levigo.WriteBatch) interface{} {
return hset(args, true, wb)
}
func Hsetnx(args [][]byte, wb *levigo.WriteBatch) interface{} {
return hset(args, false, wb)
}
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 Hget(args [][]byte, wb *levigo.WriteBatch) interface{} {
res, err := DB.Get(DefaultReadOptions, NewKeyBufferWithSuffix(HashKey, args[0], args[1]).Key())
if err != nil {
return err
}
return res
}
func Hexists(args [][]byte, wb *levigo.WriteBatch) interface{} {
res, err := DB.Get(DefaultReadOptions, NewKeyBufferWithSuffix(HashKey, args[0], args[1]).Key())
if err != nil {
return err
}
if res == nil {
return 0
}
return 1
}
func Hlen(args [][]byte, wb *levigo.WriteBatch) interface{} {
length, err := hlen(metaKey(args[0]), nil)
if err != nil {
return err
}
return length
}
func Hdel(args [][]byte, wb *levigo.WriteBatch) interface{} {
mk := metaKey(args[0])
length, err := hlen(mk, nil)
if err != nil {
return err
}
if length == 0 {
return 0
}
var deleted uint32
key := NewKeyBuffer(HashKey, args[0], len(args[1]))
for _, field := range args[1:] {
key.SetSuffix(field)
res, err := DB.Get(ReadWithoutCacheFill, key.Key())
if err != nil {
return err
}
if res == nil {
continue
}
wb.Delete(key.Key())
deleted++
}
if deleted == length {
wb.Delete(mk)
} else if deleted > 0 {
setHlen(mk, length-deleted, wb)
}
return deleted
}
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 Hmget(args [][]byte, wb *levigo.WriteBatch) interface{} {
stream := &cmdReplyStream{int64(len(args) - 1), make(chan interface{})}
go func() {
defer close(stream.items)
key := NewKeyBuffer(HashKey, args[0], len(args[1]))
for _, field := range args[1:] {
key.SetSuffix(field)
res, err := DB.Get(DefaultReadOptions, key.Key())
if err != nil {
stream.items <- err
continue
}
stream.items <- res
}
}()
return stream
}
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 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 Hgetall(args [][]byte, wb *levigo.WriteBatch) interface{} {
return hgetall(args[0], true, true)
}
func Hkeys(args [][]byte, wb *levigo.WriteBatch) interface{} {
return hgetall(args[0], true, false)
}
func Hvals(args [][]byte, wb *levigo.WriteBatch) interface{} {
return hgetall(args[0], false, true)
}
func hgetall(key []byte, fields bool, values bool) interface{} {
// use a snapshot so that the length is consistent with the iterator
snapshot := DB.NewSnapshot()
opts := levigo.NewReadOptions()
opts.SetSnapshot(snapshot)
length, err := hlen(metaKey(key), opts)
if err != nil {
return err
DB.ReleaseSnapshot(snapshot)
opts.Close()
}
if length == 0 {
return []interface{}{}
DB.ReleaseSnapshot(snapshot)
opts.Close()
}
if fields && values {
length *= 2
}
stream := &cmdReplyStream{int64(length), make(chan interface{})}
go func() {
defer close(stream.items)
iterKey := NewKeyBuffer(HashKey, key, 0)
it := DB.NewIterator(opts)
for it.Seek(iterKey.Key()); it.Valid(); it.Next() {
k := it.Key()
if !iterKey.IsPrefixOf(k) {
break
}
if fields {
stream.items <- k[len(iterKey.Key()):]
}
if values {
stream.items <- it.Value()
}
}
DB.ReleaseSnapshot(snapshot)
opts.Close()
}()
return stream
}
func DelHash(key []byte, wb *levigo.WriteBatch) {
it := DB.NewIterator(ReadWithoutCacheFill)
defer it.Close()
iterKey := NewKeyBuffer(HashKey, key, 0)
for it.Seek(iterKey.Key()); it.Valid(); it.Next() {
k := it.Key()
if !iterKey.IsPrefixOf(k) {
break
}
wb.Delete(k)
}
}
func hlen(key []byte, opts *levigo.ReadOptions) (uint32, error) {
if opts == nil {
opts = DefaultReadOptions
}
res, err := DB.Get(opts, key)
if err != nil {
return 0, err
}
if res == nil {
return 0, nil
}
if len(res) > 0 && res[0] != HashLengthValue {
return 0, InvalidKeyTypeError
}
if len(res) < 5 {
return 0, InvalidDataError
}
return binary.BigEndian.Uint32(res[1:]), nil
}
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)
}