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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 (
"bytes"
"fmt"
"os"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
)
const (
Name = "goleveldb"
defaultCompactBatchSize = 250
)
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")
}
if path == "" {
return nil, os.ErrInvalid
}
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
}
// CompactWithBatchSize removes DictionaryTerm entries with a count of zero (in batchSize batches), then
// compacts the underlying goleveldb store. Removing entries is a workaround for github issue #374.
func (ldbs *Store) CompactWithBatchSize(batchSize int) error {
// workaround for github issue #374 - remove DictionaryTerm keys with count=0
batch := &leveldb.Batch{}
for {
t, err := ldbs.db.OpenTransaction()
if err != nil {
return err
}
iter := t.NewIterator(util.BytesPrefix([]byte("d")), ldbs.defaultReadOptions)
for iter.Next() {
if bytes.Equal(iter.Value(), []byte{0}) {
k := append([]byte{}, iter.Key()...)
batch.Delete(k)
}
if batch.Len() == batchSize {
break
}
}
iter.Release()
if iter.Error() != nil {
t.Discard()
return iter.Error()
}
if batch.Len() > 0 {
err := t.Write(batch, ldbs.defaultWriteOptions)
if err != nil {
t.Discard()
return err
}
err = t.Commit()
if err != nil {
return err
}
} else {
t.Discard()
break
}
batch.Reset()
}
return ldbs.db.CompactRange(util.Range{Start: nil, Limit: nil})
}
// Compact compacts the underlying goleveldb store. The current implementation includes a workaround
// for github issue #374 (see CompactWithBatchSize).
func (ldbs *Store) Compact() error {
return ldbs.CompactWithBatchSize(defaultCompactBatchSize)
}
func init() {
registry.RegisterKVStore(Name, New)
}
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