c7443fe52b
more things can return error now in a couple of places we had to swallow errors because they didn't fit the existing API. in these case and proactively in a few others we now return error as well. also the batch API has been updated to allow performing set/delete internal within the batch
125 lines
2.9 KiB
Go
125 lines
2.9 KiB
Go
// 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 leveldb full
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package leveldb
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import (
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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/jmhodges/levigo"
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)
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const Name = "leveldb"
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type Store struct {
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path string
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opts *levigo.Options
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db *levigo.DB
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writer sync.Mutex
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}
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func Open(path string, createIfMissing bool, errorIfExists bool) (*Store, error) {
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rv := Store{
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path: path,
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}
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opts := levigo.NewOptions()
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opts.SetCreateIfMissing(createIfMissing)
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opts.SetErrorIfExists(errorIfExists)
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rv.opts = opts
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var err error
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rv.db, err = levigo.Open(rv.path, rv.opts)
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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 (ldbs *Store) get(key []byte) ([]byte, error) {
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return ldbs.db.Get(defaultReadOptions(), key)
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}
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func (ldbs *Store) getWithSnapshot(key []byte, snapshot *levigo.Snapshot) ([]byte, error) {
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options := defaultReadOptions()
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options.SetSnapshot(snapshot)
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return ldbs.db.Get(options, key)
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}
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func (ldbs *Store) set(key, val []byte) error {
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ldbs.writer.Lock()
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defer ldbs.writer.Unlock()
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return ldbs.setlocked(key, val)
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}
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func (ldbs *Store) setlocked(key, val []byte) error {
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return ldbs.db.Put(defaultWriteOptions(), key, val)
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}
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func (ldbs *Store) delete(key []byte) error {
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ldbs.writer.Lock()
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defer ldbs.writer.Unlock()
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return ldbs.deletelocked(key)
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}
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func (ldbs *Store) deletelocked(key []byte) error {
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return ldbs.db.Delete(defaultWriteOptions(), key)
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}
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func (ldbs *Store) Close() error {
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ldbs.db.Close()
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return nil
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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 (ldbs *Store) Reader() (store.KVReader, error) {
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return newReader(ldbs)
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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 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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errorIfExists := true
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eie, ok := config["error_if_exists"].(bool)
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if ok {
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errorIfExists = eie
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}
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return Open(path, createIfMissing, errorIfExists)
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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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