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bleve_leveldb_store.go
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bleve_leveldb_store.go
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// Copyright 2019 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package search
import (
"github.com/blevesearch/bleve/index/store"
"github.com/keybase/client/go/kbfs/libfs"
"github.com/pkg/errors"
"github.com/syndtr/goleveldb/leveldb"
ldberrors "github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/storage"
"github.com/syndtr/goleveldb/leveldb/util"
billy "gopkg.in/src-d/go-billy.v4"
)
type bleveLevelDBIterator struct {
iter iterator.Iterator
}
var _ store.KVIterator = (*bleveLevelDBIterator)(nil)
// Seek implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Seek(key []byte) {
_ = bldbi.iter.Seek(key)
}
// Next implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Next() {
_ = bldbi.iter.Next()
}
// Key implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Key() []byte {
return bldbi.iter.Key()
}
// Value implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Value() []byte {
return bldbi.iter.Value()
}
// Valid implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Valid() bool {
return bldbi.iter.Valid()
}
// Current implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Current() ([]byte, []byte, bool) {
return bldbi.Key(), bldbi.Value(), bldbi.Valid()
}
// Close implements the store.KVIterator interface for bleveLevelDBIterator.
func (bldbi *bleveLevelDBIterator) Close() error {
bldbi.iter.Release()
return nil
}
type bleveLevelDBReader struct {
snap *leveldb.Snapshot
}
var _ store.KVReader = (*bleveLevelDBReader)(nil)
// Get implements the store.KVReader interface for bleveLevelDBReader.
func (bldbr *bleveLevelDBReader) Get(key []byte) ([]byte, error) {
v, err := bldbr.snap.Get(key, nil)
if err == ldberrors.ErrNotFound {
return nil, nil
}
return v, err
}
// MultiGet implements the store.KVReader interface for bleveLevelDBReader.
func (bldbr *bleveLevelDBReader) MultiGet(keys [][]byte) (
values [][]byte, err error) {
return store.MultiGet(bldbr, keys)
}
// PrefixIterator implements the store.KVReader interface for bleveLevelDBReader.
func (bldbr *bleveLevelDBReader) PrefixIterator(prefix []byte) store.KVIterator {
r := util.BytesPrefix(prefix)
i := &bleveLevelDBIterator{
iter: bldbr.snap.NewIterator(r, nil),
}
i.Next()
return i
}
// RangeIterator implements the store.KVReader interface for bleveLevelDBReader.
func (bldbr *bleveLevelDBReader) RangeIterator(
start, end []byte) store.KVIterator {
i := &bleveLevelDBIterator{
iter: bldbr.snap.NewIterator(&util.Range{
Start: start,
Limit: end,
}, nil),
}
i.Next()
return i
}
// Close implements the store.KVReader interface for bleveLevelDBReader.
func (bldbr *bleveLevelDBReader) Close() error {
bldbr.snap.Release()
return nil
}
type bleveLevelDBBatch struct {
b *leveldb.Batch
m *store.EmulatedMerge
}
func newbleveLevelDBBatch(
totalBytes int, mo store.MergeOperator) *bleveLevelDBBatch {
return &bleveLevelDBBatch{
b: leveldb.MakeBatch(totalBytes),
m: store.NewEmulatedMerge(mo),
}
}
var _ store.KVBatch = (*bleveLevelDBBatch)(nil)
func (bldbb *bleveLevelDBBatch) Set(key, val []byte) {
bldbb.b.Put(key, val)
}
func (bldbb *bleveLevelDBBatch) Delete(key []byte) {
bldbb.b.Delete(key)
}
func (bldbb *bleveLevelDBBatch) Merge(key, val []byte) {
// Adapted from github.com/blevesearch/bleve/index/store/batch.go.
ck := make([]byte, len(key))
copy(ck, key)
cv := make([]byte, len(val))
copy(cv, val)
bldbb.m.Merge(key, val)
}
func (bldbb *bleveLevelDBBatch) Reset() {
bldbb.b.Reset()
}
func (bldbb *bleveLevelDBBatch) Close() error {
return nil
}
type bleveLevelDBWriter struct {
db *leveldb.DB
mo store.MergeOperator
}
var _ store.KVWriter = (*bleveLevelDBWriter)(nil)
// NewBatch implements the store.KVReader interface for bleveLevelDBWriter.
func (bldbw *bleveLevelDBWriter) NewBatch() store.KVBatch {
return newbleveLevelDBBatch(0, bldbw.mo)
}
// NewBatchEx implements the store.KVReader interface for bleveLevelDBWriter.
func (bldbw *bleveLevelDBWriter) NewBatchEx(opts store.KVBatchOptions) (
[]byte, store.KVBatch, error) {
return make([]byte, opts.TotalBytes),
newbleveLevelDBBatch(opts.TotalBytes, bldbw.mo), nil
}
// ExecuteBatch implements the store.KVReader interface for bleveLevelDBWriter.
func (bldbw *bleveLevelDBWriter) ExecuteBatch(batch store.KVBatch) error {
b, ok := batch.(*bleveLevelDBBatch)
if !ok {
return errors.Errorf("Unexpected batch type: %T", batch)
}
// Adapted from github.com/blevesearch/bleve/index/store/boltdb/writer.go.
for k, mergeOps := range b.m.Merges {
kb := []byte(k)
existingVal, err := bldbw.db.Get(kb, nil)
if err == ldberrors.ErrNotFound {
existingVal = nil
} else if err != nil {
return err
}
mergedVal, fullMergeOk := bldbw.mo.FullMerge(kb, existingVal, mergeOps)
if !fullMergeOk {
return errors.Errorf("merge operator returned failure")
}
b.Set(kb, mergedVal)
}
return bldbw.db.Write(b.b, nil)
}
// Close implements the store.KVReader interface for bleveLevelDBWriter.
func (bldbw *bleveLevelDBWriter) Close() error {
// Does this need to close outstanding batches allocated by this writer?
return nil
}
type bleveLevelDBStore struct {
s storage.Storage
db *leveldb.DB
mo store.MergeOperator
}
var _ store.KVStore = (*bleveLevelDBStore)(nil)
func newBleveLevelDBStore(
bfs billy.Filesystem, readOnly bool, mo store.MergeOperator) (
*bleveLevelDBStore, error) {
s, err := libfs.OpenLevelDBStorage(bfs, readOnly)
if err != nil {
return nil, err
}
db, err := leveldb.Open(s, nil)
if err != nil {
return nil, err
}
return &bleveLevelDBStore{s: s, db: db, mo: mo}, nil
}
// Writer implements the store.KVStore interface for bleveLevelDBStore.
func (bldbs *bleveLevelDBStore) Writer() (store.KVWriter, error) {
return &bleveLevelDBWriter{db: bldbs.db, mo: bldbs.mo}, nil
}
// Writer implements the store.KVStore interface for bleveLevelDBStore.
func (bldbs *bleveLevelDBStore) Reader() (store.KVReader, error) {
snap, err := bldbs.db.GetSnapshot()
if err != nil {
return nil, err
}
return &bleveLevelDBReader{snap: snap}, nil
}
// close implements the store.KVStore interface for bleveLevelDBStore.
func (bldbs *bleveLevelDBStore) Close() error {
err := bldbs.db.Close()
if err != nil {
return err
}
return bldbs.s.Close()
}