2014-10-31 14:42:32 +01:00
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// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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// +build forestdb
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package forestdb
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"sync"
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"github.com/blevesearch/bleve/index/store"
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"github.com/blevesearch/bleve/registry"
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"github.com/couchbaselabs/goforestdb"
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)
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2015-01-07 02:35:57 +01:00
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const Name = "forestdb"
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type Store struct {
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path string
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config *forestdb.Config
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kvconfig *forestdb.KVStoreConfig
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dbfile *forestdb.File
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dbkv *forestdb.KVStore
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writer sync.Mutex
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}
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func Open(path string, createIfMissing bool) (*Store, error) {
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rv := Store{
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path: path,
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config: forestdb.DefaultConfig(),
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kvconfig: forestdb.DefaultKVStoreConfig(),
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}
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if createIfMissing {
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rv.kvconfig.SetCreateIfMissing(true)
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}
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var err error
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rv.dbfile, err = forestdb.Open(rv.path, rv.config)
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if err != nil {
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return nil, err
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}
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rv.dbkv, err = rv.dbfile.OpenKVStoreDefault(rv.kvconfig)
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if err != nil {
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return nil, err
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}
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return &rv, nil
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}
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func (s *Store) get(key []byte) ([]byte, error) {
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res, err := s.dbkv.GetKV(key)
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if err != nil && err != forestdb.RESULT_KEY_NOT_FOUND {
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return nil, err
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}
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return res, nil
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}
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func (s *Store) set(key, val []byte) error {
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s.writer.Lock()
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defer s.writer.Unlock()
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return s.setlocked(key, val)
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}
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func (s *Store) setlocked(key, val []byte) error {
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return s.dbkv.SetKV(key, val)
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}
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func (s *Store) delete(key []byte) error {
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s.writer.Lock()
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defer s.writer.Unlock()
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return s.deletelocked(key)
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}
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func (s *Store) deletelocked(key []byte) error {
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return s.dbkv.DeleteKV(key)
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}
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func (s *Store) commit() error {
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return s.dbfile.Commit(forestdb.COMMIT_NORMAL)
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}
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func (s *Store) Close() error {
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err := s.dbkv.Close()
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if err != nil {
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return err
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}
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return s.dbfile.Close()
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}
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func (ldbs *Store) iterator(key []byte) store.KVIterator {
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rv := newIterator(ldbs)
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rv.Seek(key)
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return rv
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}
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func (s *Store) Reader() (store.KVReader, error) {
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return newReader(s)
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}
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func (ldbs *Store) Writer() (store.KVWriter, error) {
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return newWriter(ldbs)
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}
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func (ldbs *Store) newBatch() store.KVBatch {
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return newBatch(ldbs)
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}
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func (s *Store) getSeqNum() (forestdb.SeqNum, error) {
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dbinfo, err := s.dbkv.Info()
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if err != nil {
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return 0, err
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}
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return dbinfo.LastSeqNum(), nil
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}
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func (s *Store) newSnapshot() (*forestdb.KVStore, error) {
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seqNum, err := s.getSeqNum()
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if err != nil {
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return nil, err
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}
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return s.dbkv.SnapshotOpen(seqNum)
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}
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func (s *Store) getRollbackID() ([]byte, error) {
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seqNum, err := s.getSeqNum()
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if err != nil {
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return nil, err
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}
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buf := new(bytes.Buffer)
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err = binary.Write(buf, binary.LittleEndian, seqNum)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func (s *Store) rollbackTo(rollbackId []byte) error {
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s.writer.Lock()
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defer s.writer.Unlock()
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buf := bytes.NewReader(rollbackId)
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var seqNum forestdb.SeqNum
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err := binary.Read(buf, binary.LittleEndian, &seqNum)
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if err != nil {
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return err
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}
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err = s.dbkv.Rollback(seqNum)
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if err != nil {
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return err
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}
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return nil
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}
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func StoreConstructor(config map[string]interface{}) (store.KVStore, error) {
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path, ok := config["path"].(string)
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if !ok {
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return nil, fmt.Errorf("must specify path")
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}
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createIfMissing := false
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cim, ok := config["create_if_missing"].(bool)
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if ok {
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createIfMissing = cim
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}
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return Open(path, createIfMissing)
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}
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func init() {
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registry.RegisterKVStore(Name, StoreConstructor)
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}
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