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store.go
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store.go
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// Copyright (c) 2014 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package goleveldb
import (
"fmt"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/opt"
)
const Name = "goleveldb"
type Store struct {
path string
opts *opt.Options
db *leveldb.DB
mo store.MergeOperator
defaultWriteOptions *opt.WriteOptions
defaultReadOptions *opt.ReadOptions
}
func New(mo store.MergeOperator, config map[string]interface{}) (store.KVStore, error) {
path, ok := config["path"].(string)
if !ok {
return nil, fmt.Errorf("must specify path")
}
opts, err := applyConfig(&opt.Options{}, config)
if err != nil {
return nil, err
}
db, err := leveldb.OpenFile(path, opts)
if err != nil {
return nil, err
}
rv := Store{
path: path,
opts: opts,
db: db,
mo: mo,
defaultReadOptions: &opt.ReadOptions{},
defaultWriteOptions: &opt.WriteOptions{},
}
rv.defaultWriteOptions.Sync = true
return &rv, nil
}
func (ldbs *Store) Close() error {
return ldbs.db.Close()
}
func (ldbs *Store) Reader() (store.KVReader, error) {
snapshot, _ := ldbs.db.GetSnapshot()
return &Reader{
store: ldbs,
snapshot: snapshot,
}, nil
}
func (ldbs *Store) Writer() (store.KVWriter, error) {
return &Writer{
store: ldbs,
}, nil
}
func init() {
registry.RegisterKVStore(Name, New)
}