add other session providers (#5963)

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
+}