prometheus/storage/raw/index/leveldb/leveldb.go

85 lines
2.3 KiB
Go

// Copyright 2013 Prometheus Team
// 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 (
"github.com/prometheus/prometheus/coding"
"github.com/prometheus/prometheus/storage/raw"
"github.com/prometheus/prometheus/storage/raw/leveldb"
)
type indexValue struct{}
func (i *indexValue) MustEncode() []byte {
return []byte{}
}
var (
existenceValue = &indexValue{}
)
type LevelDBMembershipIndex struct {
persistence *leveldb.LevelDBPersistence
}
func (l *LevelDBMembershipIndex) Close() {
l.persistence.Close()
}
func (l *LevelDBMembershipIndex) Has(key coding.Encoder) (bool, error) {
return l.persistence.Has(key)
}
func (l *LevelDBMembershipIndex) Drop(key coding.Encoder) error {
return l.persistence.Drop(key)
}
func (l *LevelDBMembershipIndex) Put(key coding.Encoder) error {
return l.persistence.Put(key, existenceValue)
}
func NewLevelDBMembershipIndex(storageRoot string, cacheCapacity, bitsPerBloomFilterEncoded int) (i *LevelDBMembershipIndex, err error) {
leveldbPersistence, err := leveldb.NewLevelDBPersistence(storageRoot, cacheCapacity, bitsPerBloomFilterEncoded)
if err != nil {
return
}
i = &LevelDBMembershipIndex{
persistence: leveldbPersistence,
}
return
}
func (l *LevelDBMembershipIndex) Commit(batch raw.Batch) error {
return l.persistence.Commit(batch)
}
// CompactKeyspace compacts the entire database's keyspace.
//
// Beware that it would probably be imprudent to run this on a live user-facing
// server due to latency implications.
func (l *LevelDBMembershipIndex) CompactKeyspace() {
l.persistence.CompactKeyspace()
}
func (l *LevelDBMembershipIndex) ApproximateSize() (uint64, error) {
return l.persistence.ApproximateSize()
}
func (l *LevelDBMembershipIndex) State() leveldb.DatabaseState {
return l.persistence.State()
}