add other session providers (#5963)

14 files changed, 951 insertions, 0 deletions

diff --git a/vendor/github.com/lunny/nodb/store/db.go b/vendor/github.com/lunny/nodb/store/db.go
new file mode 100644
index 0000000000..00a8831a67
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/db.go
@@ -0,0 +1,61 @@
+package store
+
+import (
+	"github.com/lunny/nodb/store/driver"
+)
+
+type DB struct {
+	driver.IDB
+}
+
+func (db *DB) NewIterator() *Iterator {
+	it := new(Iterator)
+	it.it = db.IDB.NewIterator()
+
+	return it
+}
+
+func (db *DB) NewWriteBatch() WriteBatch {
+	return db.IDB.NewWriteBatch()
+}
+
+func (db *DB) NewSnapshot() (*Snapshot, error) {
+	var err error
+	s := &Snapshot{}
+	if s.ISnapshot, err = db.IDB.NewSnapshot(); err != nil {
+		return nil, err
+	}
+
+	return s, nil
+}
+
+func (db *DB) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
+	return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
+}
+
+func (db *DB) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
+	return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
+}
+
+//count < 0, unlimit.
+//
+//offset must >= 0, if < 0, will get nothing.
+func (db *DB) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
+	return NewRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
+}
+
+//count < 0, unlimit.
+//
+//offset must >= 0, if < 0, will get nothing.
+func (db *DB) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
+	return NewRevRangeLimitIterator(db.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
+}
+
+func (db *DB) Begin() (*Tx, error) {
+	tx, err := db.IDB.Begin()
+	if err != nil {
+		return nil, err
+	}
+
+	return &Tx{tx}, nil
+}
diff --git a/vendor/github.com/lunny/nodb/store/driver/batch.go b/vendor/github.com/lunny/nodb/store/driver/batch.go
new file mode 100644
index 0000000000..6b79c21c48
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/driver/batch.go
@@ -0,0 +1,39 @@
+package driver
+
+type BatchPuter interface {
+	BatchPut([]Write) error
+}
+
+type Write struct {
+	Key   []byte
+	Value []byte
+}
+
+type WriteBatch struct {
+	batch BatchPuter
+	wb    []Write
+}
+
+func (w *WriteBatch) Put(key, value []byte) {
+	if value == nil {
+		value = []byte{}
+	}
+	w.wb = append(w.wb, Write{key, value})
+}
+
+func (w *WriteBatch) Delete(key []byte) {
+	w.wb = append(w.wb, Write{key, nil})
+}
+
+func (w *WriteBatch) Commit() error {
+	return w.batch.BatchPut(w.wb)
+}
+
+func (w *WriteBatch) Rollback() error {
+	w.wb = w.wb[0:0]
+	return nil
+}
+
+func NewWriteBatch(puter BatchPuter) IWriteBatch {
+	return &WriteBatch{puter, []Write{}}
+}
diff --git a/vendor/github.com/lunny/nodb/store/driver/driver.go b/vendor/github.com/lunny/nodb/store/driver/driver.go
new file mode 100644
index 0000000000..6da67df083
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/driver/driver.go
@@ -0,0 +1,67 @@
+package driver
+
+import (
+	"errors"
+)
+
+var (
+	ErrTxSupport = errors.New("transaction is not supported")
+)
+
+type IDB interface {
+	Close() error
+
+	Get(key []byte) ([]byte, error)
+
+	Put(key []byte, value []byte) error
+	Delete(key []byte) error
+
+	NewIterator() IIterator
+
+	NewWriteBatch() IWriteBatch
+
+	NewSnapshot() (ISnapshot, error)
+
+	Begin() (Tx, error)
+}
+
+type ISnapshot interface {
+	Get(key []byte) ([]byte, error)
+	NewIterator() IIterator
+	Close()
+}
+
+type IIterator interface {
+	Close() error
+
+	First()
+	Last()
+	Seek(key []byte)
+
+	Next()
+	Prev()
+
+	Valid() bool
+
+	Key() []byte
+	Value() []byte
+}
+
+type IWriteBatch interface {
+	Put(key []byte, value []byte)
+	Delete(key []byte)
+	Commit() error
+	Rollback() error
+}
+
+type Tx interface {
+	Get(key []byte) ([]byte, error)
+	Put(key []byte, value []byte) error
+	Delete(key []byte) error
+
+	NewIterator() IIterator
+	NewWriteBatch() IWriteBatch
+
+	Commit() error
+	Rollback() error
+}
diff --git a/vendor/github.com/lunny/nodb/store/driver/store.go b/vendor/github.com/lunny/nodb/store/driver/store.go
new file mode 100644
index 0000000000..173431d4c1
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/driver/store.go
@@ -0,0 +1,46 @@
+package driver
+
+import (
+	"fmt"
+
+	"github.com/lunny/nodb/config"
+)
+
+type Store interface {
+	String() string
+	Open(path string, cfg *config.Config) (IDB, error)
+	Repair(path string, cfg *config.Config) error
+}
+
+var dbs = map[string]Store{}
+
+func Register(s Store) {
+	name := s.String()
+	if _, ok := dbs[name]; ok {
+		panic(fmt.Errorf("store %s is registered", s))
+	}
+
+	dbs[name] = s
+}
+
+func ListStores() []string {
+	s := []string{}
+	for k, _ := range dbs {
+		s = append(s, k)
+	}
+
+	return s
+}
+
+func GetStore(cfg *config.Config) (Store, error) {
+	if len(cfg.DBName) == 0 {
+		cfg.DBName = config.DefaultDBName
+	}
+
+	s, ok := dbs[cfg.DBName]
+	if !ok {
+		return nil, fmt.Errorf("store %s is not registered", cfg.DBName)
+	}
+
+	return s, nil
+}
diff --git a/vendor/github.com/lunny/nodb/store/goleveldb/batch.go b/vendor/github.com/lunny/nodb/store/goleveldb/batch.go
new file mode 100644
index 0000000000..b17e85e750
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/goleveldb/batch.go
@@ -0,0 +1,27 @@
+package goleveldb
+
+import (
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+type WriteBatch struct {
+	db     *DB
+	wbatch *leveldb.Batch
+}
+
+func (w *WriteBatch) Put(key, value []byte) {
+	w.wbatch.Put(key, value)
+}
+
+func (w *WriteBatch) Delete(key []byte) {
+	w.wbatch.Delete(key)
+}
+
+func (w *WriteBatch) Commit() error {
+	return w.db.db.Write(w.wbatch, nil)
+}
+
+func (w *WriteBatch) Rollback() error {
+	w.wbatch.Reset()
+	return nil
+}
diff --git a/vendor/github.com/lunny/nodb/store/goleveldb/const.go b/vendor/github.com/lunny/nodb/store/goleveldb/const.go
new file mode 100644
index 0000000000..2fffa7c82b
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/goleveldb/const.go
@@ -0,0 +1,4 @@
+package goleveldb
+
+const DBName = "goleveldb"
+const MemDBName = "memory"
diff --git a/vendor/github.com/lunny/nodb/store/goleveldb/db.go b/vendor/github.com/lunny/nodb/store/goleveldb/db.go
new file mode 100644
index 0000000000..a36e87f628
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/goleveldb/db.go
@@ -0,0 +1,187 @@
+package goleveldb
+
+import (
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/cache"
+	"github.com/syndtr/goleveldb/leveldb/filter"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+
+	"github.com/lunny/nodb/config"
+	"github.com/lunny/nodb/store/driver"
+
+	"os"
+)
+
+const defaultFilterBits int = 10
+
+type Store struct {
+}
+
+func (s Store) String() string {
+	return DBName
+}
+
+type MemStore struct {
+}
+
+func (s MemStore) String() string {
+	return MemDBName
+}
+
+type DB struct {
+	path string
+
+	cfg *config.LevelDBConfig
+
+	db *leveldb.DB
+
+	opts *opt.Options
+
+	iteratorOpts *opt.ReadOptions
+
+	cache cache.Cache
+
+	filter filter.Filter
+}
+
+func (s Store) Open(path string, cfg *config.Config) (driver.IDB, error) {
+	if err := os.MkdirAll(path, os.ModePerm); err != nil {
+		return nil, err
+	}
+
+	db := new(DB)
+	db.path = path
+	db.cfg = &cfg.LevelDB
+
+	db.initOpts()
+
+	var err error
+	db.db, err = leveldb.OpenFile(db.path, db.opts)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func (s Store) Repair(path string, cfg *config.Config) error {
+	db, err := leveldb.RecoverFile(path, newOptions(&cfg.LevelDB))
+	if err != nil {
+		return err
+	}
+
+	db.Close()
+	return nil
+}
+
+func (s MemStore) Open(path string, cfg *config.Config) (driver.IDB, error) {
+	db := new(DB)
+	db.path = path
+	db.cfg = &cfg.LevelDB
+
+	db.initOpts()
+
+	var err error
+	db.db, err = leveldb.Open(storage.NewMemStorage(), db.opts)
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func (s MemStore) Repair(path string, cfg *config.Config) error {
+	return nil
+}
+
+func (db *DB) initOpts() {
+	db.opts = newOptions(db.cfg)
+
+	db.iteratorOpts = &opt.ReadOptions{}
+	db.iteratorOpts.DontFillCache = true
+}
+
+func newOptions(cfg *config.LevelDBConfig) *opt.Options {
+	opts := &opt.Options{}
+	opts.ErrorIfMissing = false
+
+	cfg.Adjust()
+
+	//opts.BlockCacher = cache.NewLRU(cfg.CacheSize)
+	opts.BlockCacheCapacity = cfg.CacheSize
+
+	//we must use bloomfilter
+	opts.Filter = filter.NewBloomFilter(defaultFilterBits)
+
+	if !cfg.Compression {
+		opts.Compression = opt.NoCompression
+	} else {
+		opts.Compression = opt.SnappyCompression
+	}
+
+	opts.BlockSize = cfg.BlockSize
+	opts.WriteBuffer = cfg.WriteBufferSize
+
+	return opts
+}
+
+func (db *DB) Close() error {
+	return db.db.Close()
+}
+
+func (db *DB) Put(key, value []byte) error {
+	return db.db.Put(key, value, nil)
+}
+
+func (db *DB) Get(key []byte) ([]byte, error) {
+	v, err := db.db.Get(key, nil)
+	if err == leveldb.ErrNotFound {
+		return nil, nil
+	}
+	return v, nil
+}
+
+func (db *DB) Delete(key []byte) error {
+	return db.db.Delete(key, nil)
+}
+
+func (db *DB) NewWriteBatch() driver.IWriteBatch {
+	wb := &WriteBatch{
+		db:     db,
+		wbatch: new(leveldb.Batch),
+	}
+	return wb
+}
+
+func (db *DB) NewIterator() driver.IIterator {
+	it := &Iterator{
+		db.db.NewIterator(nil, db.iteratorOpts),
+	}
+
+	return it
+}
+
+func (db *DB) Begin() (driver.Tx, error) {
+	return nil, driver.ErrTxSupport
+}
+
+func (db *DB) NewSnapshot() (driver.ISnapshot, error) {
+	snapshot, err := db.db.GetSnapshot()
+	if err != nil {
+		return nil, err
+	}
+
+	s := &Snapshot{
+		db:  db,
+		snp: snapshot,
+	}
+
+	return s, nil
+}
+
+func init() {
+	driver.Register(Store{})
+	driver.Register(MemStore{})
+}
diff --git a/vendor/github.com/lunny/nodb/store/goleveldb/iterator.go b/vendor/github.com/lunny/nodb/store/goleveldb/iterator.go
new file mode 100644
index 0000000000..c1fd8b5573
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/goleveldb/iterator.go
@@ -0,0 +1,49 @@
+package goleveldb
+
+import (
+	"github.com/syndtr/goleveldb/leveldb/iterator"
+)
+
+type Iterator struct {
+	it iterator.Iterator
+}
+
+func (it *Iterator) Key() []byte {
+	return it.it.Key()
+}
+
+func (it *Iterator) Value() []byte {
+	return it.it.Value()
+}
+
+func (it *Iterator) Close() error {
+	if it.it != nil {
+		it.it.Release()
+		it.it = nil
+	}
+	return nil
+}
+
+func (it *Iterator) Valid() bool {
+	return it.it.Valid()
+}
+
+func (it *Iterator) Next() {
+	it.it.Next()
+}
+
+func (it *Iterator) Prev() {
+	it.it.Prev()
+}
+
+func (it *Iterator) First() {
+	it.it.First()
+}
+
+func (it *Iterator) Last() {
+	it.it.Last()
+}
+
+func (it *Iterator) Seek(key []byte) {
+	it.it.Seek(key)
+}
diff --git a/vendor/github.com/lunny/nodb/store/goleveldb/snapshot.go b/vendor/github.com/lunny/nodb/store/goleveldb/snapshot.go
new file mode 100644
index 0000000000..fe2b409c3f
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/goleveldb/snapshot.go
@@ -0,0 +1,26 @@
+package goleveldb
+
+import (
+	"github.com/lunny/nodb/store/driver"
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+type Snapshot struct {
+	db  *DB
+	snp *leveldb.Snapshot
+}
+
+func (s *Snapshot) Get(key []byte) ([]byte, error) {
+	return s.snp.Get(key, s.db.iteratorOpts)
+}
+
+func (s *Snapshot) NewIterator() driver.IIterator {
+	it := &Iterator{
+		s.snp.NewIterator(nil, s.db.iteratorOpts),
+	}
+	return it
+}
+
+func (s *Snapshot) Close() {
+	s.snp.Release()
+}
diff --git a/vendor/github.com/lunny/nodb/store/iterator.go b/vendor/github.com/lunny/nodb/store/iterator.go
new file mode 100644
index 0000000000..27bf689da2
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/iterator.go
@@ -0,0 +1,327 @@
+package store
+
+import (
+	"bytes"
+
+	"github.com/lunny/nodb/store/driver"
+)
+
+const (
+	IteratorForward  uint8 = 0
+	IteratorBackward uint8 = 1
+)
+
+const (
+	RangeClose uint8 = 0x00
+	RangeLOpen uint8 = 0x01
+	RangeROpen uint8 = 0x10
+	RangeOpen  uint8 = 0x11
+)
+
+// min must less or equal than max
+//
+// range type:
+//
+//  close: [min, max]
+//  open: (min, max)
+//  lopen: (min, max]
+//  ropen: [min, max)
+//
+type Range struct {
+	Min []byte
+	Max []byte
+
+	Type uint8
+}
+
+type Limit struct {
+	Offset int
+	Count  int
+}
+
+type Iterator struct {
+	it driver.IIterator
+}
+
+// Returns a copy of key.
+func (it *Iterator) Key() []byte {
+	k := it.it.Key()
+	if k == nil {
+		return nil
+	}
+
+	return append([]byte{}, k...)
+}
+
+// Returns a copy of value.
+func (it *Iterator) Value() []byte {
+	v := it.it.Value()
+	if v == nil {
+		return nil
+	}
+
+	return append([]byte{}, v...)
+}
+
+// Returns a reference of key.
+// you must be careful that it will be changed after next iterate.
+func (it *Iterator) RawKey() []byte {
+	return it.it.Key()
+}
+
+// Returns a reference of value.
+// you must be careful that it will be changed after next iterate.
+func (it *Iterator) RawValue() []byte {
+	return it.it.Value()
+}
+
+// Copy key to b, if b len is small or nil, returns a new one.
+func (it *Iterator) BufKey(b []byte) []byte {
+	k := it.RawKey()
+	if k == nil {
+		return nil
+	}
+	if b == nil {
+		b = []byte{}
+	}
+
+	b = b[0:0]
+	return append(b, k...)
+}
+
+// Copy value to b, if b len is small or nil, returns a new one.
+func (it *Iterator) BufValue(b []byte) []byte {
+	v := it.RawValue()
+	if v == nil {
+		return nil
+	}
+
+	if b == nil {
+		b = []byte{}
+	}
+
+	b = b[0:0]
+	return append(b, v...)
+}
+
+func (it *Iterator) Close() {
+	if it.it != nil {
+		it.it.Close()
+		it.it = nil
+	}
+}
+
+func (it *Iterator) Valid() bool {
+	return it.it.Valid()
+}
+
+func (it *Iterator) Next() {
+	it.it.Next()
+}
+
+func (it *Iterator) Prev() {
+	it.it.Prev()
+}
+
+func (it *Iterator) SeekToFirst() {
+	it.it.First()
+}
+
+func (it *Iterator) SeekToLast() {
+	it.it.Last()
+}
+
+func (it *Iterator) Seek(key []byte) {
+	it.it.Seek(key)
+}
+
+// Finds by key, if not found, nil returns.
+func (it *Iterator) Find(key []byte) []byte {
+	it.Seek(key)
+	if it.Valid() {
+		k := it.RawKey()
+		if k == nil {
+			return nil
+		} else if bytes.Equal(k, key) {
+			return it.Value()
+		}
+	}
+
+	return nil
+}
+
+// Finds by key, if not found, nil returns, else a reference of value returns.
+// you must be careful that it will be changed after next iterate.
+func (it *Iterator) RawFind(key []byte) []byte {
+	it.Seek(key)
+	if it.Valid() {
+		k := it.RawKey()
+		if k == nil {
+			return nil
+		} else if bytes.Equal(k, key) {
+			return it.RawValue()
+		}
+	}
+
+	return nil
+}
+
+type RangeLimitIterator struct {
+	it *Iterator
+
+	r *Range
+	l *Limit
+
+	step int
+
+	//0 for IteratorForward, 1 for IteratorBackward
+	direction uint8
+}
+
+func (it *RangeLimitIterator) Key() []byte {
+	return it.it.Key()
+}
+
+func (it *RangeLimitIterator) Value() []byte {
+	return it.it.Value()
+}
+
+func (it *RangeLimitIterator) RawKey() []byte {
+	return it.it.RawKey()
+}
+
+func (it *RangeLimitIterator) RawValue() []byte {
+	return it.it.RawValue()
+}
+
+func (it *RangeLimitIterator) BufKey(b []byte) []byte {
+	return it.it.BufKey(b)
+}
+
+func (it *RangeLimitIterator) BufValue(b []byte) []byte {
+	return it.it.BufValue(b)
+}
+
+func (it *RangeLimitIterator) Valid() bool {
+	if it.l.Offset < 0 {
+		return false
+	} else if !it.it.Valid() {
+		return false
+	} else if it.l.Count >= 0 && it.step >= it.l.Count {
+		return false
+	}
+
+	if it.direction == IteratorForward {
+		if it.r.Max != nil {
+			r := bytes.Compare(it.it.RawKey(), it.r.Max)
+			if it.r.Type&RangeROpen > 0 {
+				return !(r >= 0)
+			} else {
+				return !(r > 0)
+			}
+		}
+	} else {
+		if it.r.Min != nil {
+			r := bytes.Compare(it.it.RawKey(), it.r.Min)
+			if it.r.Type&RangeLOpen > 0 {
+				return !(r <= 0)
+			} else {
+				return !(r < 0)
+			}
+		}
+	}
+
+	return true
+}
+
+func (it *RangeLimitIterator) Next() {
+	it.step++
+
+	if it.direction == IteratorForward {
+		it.it.Next()
+	} else {
+		it.it.Prev()
+	}
+}
+
+func (it *RangeLimitIterator) Close() {
+	it.it.Close()
+}
+
+func NewRangeLimitIterator(i *Iterator, r *Range, l *Limit) *RangeLimitIterator {
+	return rangeLimitIterator(i, r, l, IteratorForward)
+}
+
+func NewRevRangeLimitIterator(i *Iterator, r *Range, l *Limit) *RangeLimitIterator {
+	return rangeLimitIterator(i, r, l, IteratorBackward)
+}
+
+func NewRangeIterator(i *Iterator, r *Range) *RangeLimitIterator {
+	return rangeLimitIterator(i, r, &Limit{0, -1}, IteratorForward)
+}
+
+func NewRevRangeIterator(i *Iterator, r *Range) *RangeLimitIterator {
+	return rangeLimitIterator(i, r, &Limit{0, -1}, IteratorBackward)
+}
+
+func rangeLimitIterator(i *Iterator, r *Range, l *Limit, direction uint8) *RangeLimitIterator {
+	it := new(RangeLimitIterator)
+
+	it.it = i
+
+	it.r = r
+	it.l = l
+	it.direction = direction
+
+	it.step = 0
+
+	if l.Offset < 0 {
+		return it
+	}
+
+	if direction == IteratorForward {
+		if r.Min == nil {
+			it.it.SeekToFirst()
+		} else {
+			it.it.Seek(r.Min)
+
+			if r.Type&RangeLOpen > 0 {
+				if it.it.Valid() && bytes.Equal(it.it.RawKey(), r.Min) {
+					it.it.Next()
+				}
+			}
+		}
+	} else {
+		if r.Max == nil {
+			it.it.SeekToLast()
+		} else {
+			it.it.Seek(r.Max)
+
+			if !it.it.Valid() {
+				it.it.SeekToLast()
+			} else {
+				if !bytes.Equal(it.it.RawKey(), r.Max) {
+					it.it.Prev()
+				}
+			}
+
+			if r.Type&RangeROpen > 0 {
+				if it.it.Valid() && bytes.Equal(it.it.RawKey(), r.Max) {
+					it.it.Prev()
+				}
+			}
+		}
+	}
+
+	for i := 0; i < l.Offset; i++ {
+		if it.it.Valid() {
+			if it.direction == IteratorForward {
+				it.it.Next()
+			} else {
+				it.it.Prev()
+			}
+		}
+	}
+
+	return it
+}
diff --git a/vendor/github.com/lunny/nodb/store/snapshot.go b/vendor/github.com/lunny/nodb/store/snapshot.go
new file mode 100644
index 0000000000..75ba0497db
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/snapshot.go
@@ -0,0 +1,16 @@
+package store
+
+import (
+	"github.com/lunny/nodb/store/driver"
+)
+
+type Snapshot struct {
+	driver.ISnapshot
+}
+
+func (s *Snapshot) NewIterator() *Iterator {
+	it := new(Iterator)
+	it.it = s.ISnapshot.NewIterator()
+
+	return it
+}
diff --git a/vendor/github.com/lunny/nodb/store/store.go b/vendor/github.com/lunny/nodb/store/store.go
new file mode 100644
index 0000000000..5d0ade1bf0
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/store.go
@@ -0,0 +1,51 @@
+package store
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"github.com/lunny/nodb/config"
+	"github.com/lunny/nodb/store/driver"
+
+	_ "github.com/lunny/nodb/store/goleveldb"
+)
+
+func getStorePath(cfg *config.Config) string {
+	return path.Join(cfg.DataDir, fmt.Sprintf("%s_data", cfg.DBName))
+}
+
+func Open(cfg *config.Config) (*DB, error) {
+	s, err := driver.GetStore(cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	path := getStorePath(cfg)
+
+	if err := os.MkdirAll(path, os.ModePerm); err != nil {
+		return nil, err
+	}
+
+	idb, err := s.Open(path, cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	db := &DB{idb}
+
+	return db, nil
+}
+
+func Repair(cfg *config.Config) error {
+	s, err := driver.GetStore(cfg)
+	if err != nil {
+		return err
+	}
+
+	path := getStorePath(cfg)
+
+	return s.Repair(path, cfg)
+}
+
+func init() {
+}
diff --git a/vendor/github.com/lunny/nodb/store/tx.go b/vendor/github.com/lunny/nodb/store/tx.go
new file mode 100644
index 0000000000..32bcbcda4b
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/tx.go
@@ -0,0 +1,42 @@
+package store
+
+import (
+	"github.com/lunny/nodb/store/driver"
+)
+
+type Tx struct {
+	driver.Tx
+}
+
+func (tx *Tx) NewIterator() *Iterator {
+	it := new(Iterator)
+	it.it = tx.Tx.NewIterator()
+
+	return it
+}
+
+func (tx *Tx) NewWriteBatch() WriteBatch {
+	return tx.Tx.NewWriteBatch()
+}
+
+func (tx *Tx) RangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
+	return NewRangeLimitIterator(tx.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
+}
+
+func (tx *Tx) RevRangeIterator(min []byte, max []byte, rangeType uint8) *RangeLimitIterator {
+	return NewRevRangeLimitIterator(tx.NewIterator(), &Range{min, max, rangeType}, &Limit{0, -1})
+}
+
+//count < 0, unlimit.
+//
+//offset must >= 0, if < 0, will get nothing.
+func (tx *Tx) RangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
+	return NewRangeLimitIterator(tx.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
+}
+
+//count < 0, unlimit.
+//
+//offset must >= 0, if < 0, will get nothing.
+func (tx *Tx) RevRangeLimitIterator(min []byte, max []byte, rangeType uint8, offset int, count int) *RangeLimitIterator {
+	return NewRevRangeLimitIterator(tx.NewIterator(), &Range{min, max, rangeType}, &Limit{offset, count})
+}
diff --git a/vendor/github.com/lunny/nodb/store/writebatch.go b/vendor/github.com/lunny/nodb/store/writebatch.go
new file mode 100644
index 0000000000..23e079eba6
--- /dev/null
+++ b/vendor/github.com/lunny/nodb/store/writebatch.go
@@ -0,0 +1,9 @@
+package store
+
+import (
+	"github.com/lunny/nodb/store/driver"
+)
+
+type WriteBatch interface {
+	driver.IWriteBatch
+}