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bucket.go
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bucket.go
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// Copyright (c) 2021 The VeChainThor developers
// Distributed under the GNU Lesser General Public License v3.0 software license, see the accompanying
// file LICENSE or <https://www.gnu.org/licenses/lgpl-3.0.html>
package kv
import (
"sync"
"github.com/syndtr/goleveldb/leveldb/util"
)
// Bucket provides logical bucket for kv store.
type Bucket string
// NewGetter creates a bucket getter from the source getter.
func (b Bucket) NewGetter(src Getter) Getter {
return &struct {
GetFunc
HasFunc
IsNotFoundFunc
}{
func(key []byte) ([]byte, error) {
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), key...)
return src.Get(buf.k)
},
func(key []byte) (bool, error) {
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), key...)
return src.Has(buf.k)
},
src.IsNotFound,
}
}
// NewPutter creates a bucket putter from the source putter.
func (b Bucket) NewPutter(src Putter) Putter {
return &struct {
PutFunc
DeleteFunc
}{
func(key, val []byte) error {
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), key...)
return src.Put(buf.k, val)
},
func(key []byte) error {
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), key...)
return src.Delete(buf.k)
},
}
}
// NewStore creates a bucket store from the source store.
func (b Bucket) NewStore(src Store) Store {
return &struct {
Getter
Putter
SnapshotFunc
BulkFunc
IterateFunc
}{
b.NewGetter(src),
b.NewPutter(src),
func() Snapshot {
snapshot := src.Snapshot()
return &struct {
Getter
ReleaseFunc
}{
b.NewGetter(snapshot),
snapshot.Release,
}
},
func() Bulk {
bulk := src.Bulk()
return &struct {
Putter
EnableAutoFlushFunc
WriteFunc
}{
b.NewPutter(bulk),
bulk.EnableAutoFlush,
bulk.Write,
}
},
func(r Range) Iterator {
{
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), r.Start...)
r.Start = buf.k
}
if len(r.Limit) == 0 {
r.Limit = util.BytesPrefix([]byte(b)).Limit
} else {
buf := bufPool.Get().(*buf)
defer bufPool.Put(buf)
buf.k = append(append(buf.k[:0], b...), r.Limit...)
r.Limit = buf.k
}
iter := src.Iterate(r)
return &struct {
FirstFunc
LastFunc
NextFunc
PrevFunc
KeyFunc
ValueFunc
ReleaseFunc
ErrorFunc
}{
iter.First,
iter.Last,
iter.Next,
iter.Prev,
// strip the bucket
func() []byte { return iter.Key()[len(b):] },
iter.Value,
iter.Release,
iter.Error,
}
},
}
}
type buf struct {
k []byte
}
var bufPool = sync.Pool{
New: func() interface{} {
return &buf{}
},
}