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store.go
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store.go
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// modified and copied from "github.com/blevesearch/bleve/index/store/goleveldb"
// 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 leveldb
import (
"fmt"
"github.com/noypi/kv"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
)
type _store struct {
path string
opts *opt.Options
db *leveldb.DB
mo kv.MergeOperator
defaultWriteOptions *opt.WriteOptions
defaultReadOptions *opt.ReadOptions
}
func GetDefault(path string) (kv.KVStore, error) {
return New(dummymergeop{}, map[string]interface{}{
"path": path,
})
}
func New(mo kv.MergeOperator, config map[string]interface{}) (kv.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() (kv.KVReader, error) {
snapshot, _ := ldbs.db.GetSnapshot()
return &_reader{
store: ldbs,
snapshot: snapshot,
}, nil
}
func (ldbs *_store) Writer() (kv.KVWriter, error) {
return &_writer{
store: ldbs,
}, nil
}
func applyConfig(o *opt.Options, config map[string]interface{}) (*opt.Options, error) {
ro, ok := config["read_only"].(bool)
if ok {
o.ReadOnly = ro
}
cim, ok := config["create_if_missing"].(bool)
if ok {
o.ErrorIfMissing = !cim
}
eie, ok := config["error_if_exists"].(bool)
if ok {
o.ErrorIfExist = eie
}
wbs, ok := config["write_buffer_size"].(float64)
if ok {
o.WriteBuffer = int(wbs)
}
bs, ok := config["block_size"].(float64)
if ok {
o.BlockSize = int(bs)
}
bri, ok := config["block_restart_interval"].(float64)
if ok {
o.BlockRestartInterval = int(bri)
}
lcc, ok := config["lru_cache_capacity"].(float64)
if ok {
o.BlockCacheCapacity = int(lcc)
}
bfbpk, ok := config["bloom_filter_bits_per_key"].(float64)
if ok {
bf := filter.NewBloomFilter(int(bfbpk))
o.Filter = bf
}
return o, nil
}
type dummymergeop struct{}
func (this dummymergeop) FullMerge(key, existingValue []byte, operands [][]byte) ([]byte, bool) {
return []byte{}, true
}
func (this dummymergeop) PartialMerge(key, leftOperand, rightOperand []byte) ([]byte, bool) {
return []byte{}, true
}
func (this dummymergeop) Name() string {
return "dummy-mergeop"
}