forked from blevesearch/bleve
/
store.go
181 lines (156 loc) · 3.96 KB
/
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 implements a store.KVStore on top of BoltDB. It supports the
// following options:
//
// "bucket" (string): the name of BoltDB bucket to use, defaults to "bleve".
//
// "nosync" (bool): if true, set boltdb.DB.NoSync to true. It speeds up index
// operations in exchange of losing integrity guarantees if indexation aborts
// without closing the index. Use it when rebuilding indexes from zero.
package boltdb
import (
"bytes"
"encoding/json"
"fmt"
"os"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
bolt "go.etcd.io/bbolt"
)
const (
Name = "boltdb"
defaultCompactBatchSize = 100
)
type Store struct {
path string
bucket string
db *bolt.DB
noSync bool
fillPercent float64
mo store.MergeOperator
}
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
}
bucket, ok := config["bucket"].(string)
if !ok {
bucket = "bleve"
}
noSync, _ := config["nosync"].(bool)
fillPercent, ok := config["fillPercent"].(float64)
if !ok {
fillPercent = bolt.DefaultFillPercent
}
bo := &bolt.Options{}
ro, ok := config["read_only"].(bool)
if ok {
bo.ReadOnly = ro
}
if initialMmapSize, ok := config["initialMmapSize"].(int); ok {
bo.InitialMmapSize = initialMmapSize
} else if initialMmapSize, ok := config["initialMmapSize"].(float64); ok {
bo.InitialMmapSize = int(initialMmapSize)
}
db, err := bolt.Open(path, 0600, bo)
if err != nil {
return nil, err
}
db.NoSync = noSync
if !bo.ReadOnly {
err = db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists([]byte(bucket))
return err
})
if err != nil {
return nil, err
}
}
rv := Store{
path: path,
bucket: bucket,
db: db,
mo: mo,
noSync: noSync,
fillPercent: fillPercent,
}
return &rv, nil
}
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,
bucket: tx.Bucket([]byte(bs.bucket)),
}, nil
}
func (bs *Store) Writer() (store.KVWriter, error) {
return &Writer{
store: bs,
}, nil
}
func (bs *Store) Stats() json.Marshaler {
return &stats{
s: bs,
}
}
// CompactWithBatchSize removes DictionaryTerm entries with a count of zero (in batchSize batches)
// Removing entries is a workaround for github issue #374.
func (bs *Store) CompactWithBatchSize(batchSize int) error {
for {
cnt := 0
err := bs.db.Batch(func(tx *bolt.Tx) error {
c := tx.Bucket([]byte(bs.bucket)).Cursor()
prefix := []byte("d")
for k, v := c.Seek(prefix); bytes.HasPrefix(k, prefix); k, v = c.Next() {
if bytes.Equal(v, []byte{0}) {
cnt++
if err := c.Delete(); err != nil {
return err
}
if cnt == batchSize {
break
}
}
}
return nil
})
if err != nil {
return err
}
if cnt == 0 {
break
}
}
return nil
}
// Compact calls CompactWithBatchSize with a default batch size of 100. This is a workaround
// for github issue #374.
func (bs *Store) Compact() error {
return bs.CompactWithBatchSize(defaultCompactBatchSize)
}
func init() {
registry.RegisterKVStore(Name, New)
}