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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 boltdb
import (
"fmt"
"sync"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
"github.com/boltdb/bolt"
)
const Name = "boltdb"
type Store struct {
path string
bucket string
db *bolt.DB
writer sync.Mutex
mo store.MergeOperator
}
func New(path string, bucket string) *Store {
rv := Store{
path: path,
bucket: bucket,
}
return &rv
}
func (bs *Store) Open() error {
var err error
bs.db, err = bolt.Open(bs.path, 0600, nil)
if err != nil {
return err
}
err = bs.db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists([]byte(bs.bucket))
return err
})
if err != nil {
return err
}
return nil
}
func (bs *Store) SetMergeOperator(mo store.MergeOperator) {
bs.mo = mo
}
func (bs *Store) Close() error {
return bs.db.Close()
}
func (bs *Store) Reader() (store.KVReader, error) {
tx, err := bs.db.Begin(false)
if err != nil {
return nil, err
}
return &Reader{
store: bs,
tx: tx,
}, nil
}
func (bs *Store) Writer() (store.KVWriter, error) {
bs.writer.Lock()
tx, err := bs.db.Begin(true)
if err != nil {
bs.writer.Unlock()
return nil, err
}
reader := &Reader{
store: bs,
tx: tx,
}
return &Writer{
store: bs,
tx: tx,
reader: reader,
}, nil
}
func StoreConstructor(config map[string]interface{}) (store.KVStore, error) {
path, ok := config["path"].(string)
if !ok {
return nil, fmt.Errorf("must specify path")
}
bucket, ok := config["bucket"].(string)
if !ok {
bucket = "bleve"
}
return New(path, bucket), nil
}
func init() {
registry.RegisterKVStore(Name, StoreConstructor)
}