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// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
// All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package leveldb
import (
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/storage"
"github.com/syndtr/goleveldb/leveldb/util"
)
// Reader is the interface that wraps basic Get and NewIterator methods.
// This interface implemented by both DB and Snapshot.
type Reader interface {
Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)
NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
}
// Sizes is list of size.
type Sizes []int64
// Sum returns sum of the sizes.
func (sizes Sizes) Sum() int64 {
var sum int64
for _, size := range sizes {
sum += size
}
return sum
}
// Logging.
func (db *DB) log(v ...interface{}) { db.s.log(v...) }
func (db *DB) logf(format string, v ...interface{}) { db.s.logf(format, v...) }
// Check and clean files.
func (db *DB) checkAndCleanFiles() error {
v := db.s.version()
defer v.release()
tmap := make(map[int64]bool)
for _, tables := range v.levels {
for _, t := range tables {
tmap[t.fd.Num] = false
}
}
fds, err := db.s.stor.List(storage.TypeAll)
if err != nil {
return err
}
var nt int
var rem []storage.FileDesc
for _, fd := range fds {
keep := true
switch fd.Type {
case storage.TypeManifest:
keep = fd.Num >= db.s.manifestFd.Num
case storage.TypeJournal:
if !db.frozenJournalFd.Zero() {
keep = fd.Num >= db.frozenJournalFd.Num
} else {
keep = fd.Num >= db.journalFd.Num
}
case storage.TypeTable:
_, keep = tmap[fd.Num]
if keep {
tmap[fd.Num] = true
nt++
}
}
if !keep {
rem = append(rem, fd)
}
}
if nt != len(tmap) {
var mfds []storage.FileDesc
for num, present := range tmap {
if !present {
mfds = append(mfds, storage.FileDesc{storage.TypeTable, num})
db.logf("db@janitor table missing @%d", num)
}
}
return errors.NewErrCorrupted(storage.FileDesc{}, &errors.ErrMissingFiles{Fds: mfds})
}
db.logf("db@janitor F·%d G·%d", len(fds), len(rem))
for _, fd := range rem {
db.logf("db@janitor removing %s-%d", fd.Type, fd.Num)
if err := db.s.stor.Remove(fd); err != nil {
return err
}
}
return nil
}
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