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leveldb.go
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leveldb.go
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package disk
import (
"bytes"
"errors"
"strconv"
"sync"
"time"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/util"
)
const expSeparator = ";"
// LevelDB - represents a leveldb db implementation
type LevelDB struct {
db *leveldb.DB
sync.RWMutex
}
// OpenLevelDB - Opens the specified path
func OpenLevelDB(path string) (*LevelDB, error) {
db, err := leveldb.OpenFile(path, nil)
if err != nil {
return nil, err
}
ldb := new(LevelDB)
ldb.db = db
return ldb, nil
}
// Size - returns the size of the database in bytes
func (ldb *LevelDB) Size() int64 {
var stats leveldb.DBStats
if nil != ldb.db.Stats(&stats) {
return -1
}
size := int64(0)
for _, v := range stats.LevelSizes {
size += v
}
return size
}
// Close ...
func (ldb *LevelDB) Close() {
ldb.db.Close()
}
// GC - runs the garbage collector
func (ldb *LevelDB) GC() error {
return ldb.db.CompactRange(util.Range{})
}
// Incr - increment the key by the specified value
func (ldb *LevelDB) Incr(k string, by int64) (int64, error) {
ldb.Lock()
defer ldb.Unlock()
val, err := ldb.get(k)
if err != nil {
val = []byte{}
}
valFloat, _ := strconv.ParseInt(string(val), 10, 64)
valFloat += by
err = ldb.set([]byte(k), intToByteSlice(valFloat), -1)
if err != nil {
return 0, err
}
return valFloat, nil
}
func intToByteSlice(v int64) []byte {
return []byte(strconv.FormatInt(v, 10))
}
func (ldb *LevelDB) set(k, v []byte, ttl time.Duration) error {
var expires int64
if ttl > 0 {
expires = time.Now().Add(ttl).Unix()
}
expiresBytes := append(intToByteSlice(expires), expSeparator[:]...)
v = append(expiresBytes, v...)
return ldb.db.Put(k, v, nil)
}
// Set - sets a key with the specified value and optional ttl
func (ldb *LevelDB) Set(k string, v []byte, ttl time.Duration) error {
return ldb.set([]byte(k), v, ttl)
}
// MSet - sets multiple key-value pairs
func (ldb *LevelDB) MSet(data map[string][]byte) error {
batch := new(leveldb.Batch)
for k, v := range data {
v = append([]byte("0;"), v...)
batch.Put([]byte(k), v)
}
return ldb.db.Write(batch, nil)
}
func (ldb *LevelDB) get(k string) ([]byte, error) {
var data []byte
var err error
delete := false
item, err := ldb.db.Get([]byte(k), nil)
if err != nil {
return []byte{}, err
}
parts := bytes.SplitN(item, []byte(expSeparator), 2)
expires, actual := parts[0], parts[1]
if exp, _ := strconv.Atoi(string(expires)); exp > 0 && int(time.Now().Unix()) >= exp {
delete = true
err = errors.New("key not found")
} else {
data = actual
}
if delete {
ldb.db.Delete([]byte(k), nil)
return data, ErrNotFound
}
return data, nil
}
// Get - fetches the value of the specified k
func (ldb *LevelDB) Get(k string) ([]byte, error) {
return ldb.get(k)
}
// MGet - fetch multiple values of the specified keys
func (ldb *LevelDB) MGet(keys []string) [][]byte {
var data [][]byte
for _, key := range keys {
val, err := ldb.get(key)
if err != nil {
data = append(data, []byte{})
continue
}
data = append(data, val)
}
return data
}
// TTL - returns the time to live of the specified key's value
func (ldb *LevelDB) TTL(key string) int64 {
item, err := ldb.db.Get([]byte(key), nil)
if err != nil {
return -2
}
parts := bytes.SplitN(item, []byte(expSeparator), 2)
exp, _ := strconv.Atoi(string(parts[0]))
if exp == 0 {
return -1
}
now := time.Now().Unix()
if now >= int64(exp) {
return -2
}
return int64(exp) - now
}
// MDel - removes key(s) from the store
func (ldb *LevelDB) MDel(keys []string) error {
batch := new(leveldb.Batch)
for _, key := range keys {
batch.Delete([]byte(key))
}
return ldb.db.Write(batch, nil)
}
// Del - removes key from the store
func (ldb *LevelDB) Del(key string) error {
return ldb.db.Delete([]byte(key), nil)
}
// Scan - iterate over the whole store using the handler function
func (ldb *LevelDB) Scan(scannerOpt ScannerOptions) error {
var iter iterator.Iterator
if scannerOpt.Offset == "" {
iter = ldb.db.NewIterator(nil, nil)
} else {
iter = ldb.db.NewIterator(&util.Range{Start: []byte(scannerOpt.Offset)}, nil)
if !scannerOpt.IncludeOffset {
iter.Next()
}
}
valid := func(k []byte) bool {
if k == nil {
return false
}
if scannerOpt.Prefix != "" && !bytes.HasPrefix(k, []byte(scannerOpt.Prefix)) {
return false
}
return true
}
for iter.Next() {
key := iter.Key()
val := bytes.SplitN(iter.Value(), []byte(";"), 2)[1]
if !valid(key) || scannerOpt.Handler(key, val) != nil {
break
}
}
iter.Release()
return iter.Error()
}
// empty
func (ldb *LevelDB) Empty() (bool, error) {
var iter iterator.Iterator
iter = ldb.db.NewIterator(nil, nil)
isEmpty := true
for iter.Next() {
isEmpty = false
break
}
iter.Release()
return isEmpty, iter.Error()
}