You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: db.go
    path of file: ./repos/xorm/vendor/github.com/syndtr/goleveldb/leveldb
    
    the code of the file until where you have to start completion: // 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 (
	"container/list"
	"fmt"
	"io"
	"os"
	"runtime"
	"strings"
	"sync"
	"sync/atomic"
	"time"

	"github.com/syndtr/goleveldb/leveldb/errors"
	"github.com/syndtr/goleveldb/leveldb/iterator"
	"github.com/syndtr/goleveldb/leveldb/journal"
	"github.com/syndtr/goleveldb/leveldb/memdb"
	"github.com/syndtr/goleveldb/leveldb/opt"
	"github.com/syndtr/goleveldb/leveldb/storage"
	"github.com/syndtr/goleveldb/leveldb/table"
	"github.com/syndtr/goleveldb/leveldb/util"
)

// DB is a LevelDB database.
type DB struct {
	// Need 64-bit alignment.
	seq uint64

	// Stats. Need 64-bit alignment.
	cWriteDelay            int64 // The cumulative duration of write delays
	cWriteDelayN           int32 // The cumulative number of write delays
	inWritePaused          int32 // The indicator whether write operation is paused by compaction
	aliveSnaps, aliveIters int32

	// Compaction statistic
	memComp       uint32 // The cumulative number of memory compaction
	level0Comp    uint32 // The cumulative number of level0 compaction
	nonLevel0Comp uint32 // The cumulative number of non-level0 compaction
	seekComp      uint32 // The cumulative number of seek compaction

	// Session.
	s *session

	// MemDB.
	memMu           sync.RWMutex
	memPool         chan *memdb.DB
	mem, frozenMem  *memDB
	journal         *journal.Writer
	journalWriter   storage.Writer
	journalFd       storage.FileDesc
	frozenJournalFd storage.FileDesc
	frozenSeq       uint64

	// Snapshot.
	snapsMu   sync.Mutex
	snapsList *list.List

	// Write.
	batchPool    sync.Pool
	writeMergeC  chan writeMerge
	writeMergedC chan bool
	writeLockC   chan struct{}
	writeAckC    chan error
	writeDelay   time.Duration
	writeDelayN  int
	tr           *Transaction

	// Compaction.
	compCommitLk     sync.Mutex
	tcom
    
func (db *DB) GetProperty(name string) (value string, err error) {
	err = db.ok()
	if err != nil {
		return
	}

	const prefix = "leveldb."
	if !strings.HasPrefix(name, prefix) {
		return "", ErrNotFound
	}
	p := name[len(prefix):]

	v := db.s.version()
	defer v.release()

	numFilesPrefix := "num-files-at-level"
	switch {
	case strings.HasPrefix(p, numFilesPrefix):
		var level uint
		var rest string
		n, _ := fmt.Sscanf(p[len(numFilesPrefix):], "%d%s", &level, &rest)
		if n != 1 {
			err = ErrNotFound
		} else {
			value = fmt.Sprint(v.tLen(int(level)))
		}
	case p == "stats":
		value = "Compactions\n" +
			" Level |   Tables   |    Size(MB)   |    Time(sec)  |    Read(MB)   |   Write(MB)\n" +
			"-------+------------+---------------+---------------+---------------+---------------\n"
		var totalTables int
		var totalSize, totalRead, totalWrite int64
		var totalDuration time.Duration
		for level, tables := range v.levels {
			duration, read, write := db.compStats.getStat(level)
			if len(tables) == 0 && duration == 0 {
				continue
			}
			totalTables += len(tables)
			totalSize += tables.size()
			totalRead += read
			totalWrite += write
			totalDuration += duration
			value += fmt.Sprintf(" %3d   | %10d | %13.5f | %13.5f | %13.5f | %13.5f\n",
				level, len(tables), float64(tables.size())/1048576.0, duration.Seconds(),
				float64(read)/1048576.0, float64(write)/1048576.0)
		}
		value += "-------+------------+---------------+---------------+---------------+---------------\n"
		value += fmt.Sprintf(" Total | %10d | %13.5f | %13.5f | %13.5f | %13.5f\n",
			totalTables, float64(totalSize)/1048576.0, totalDuration.Seconds(),
			float64(totalRead)/1048576.0, float64(totalWrite)/1048576.0)
	case p == "compcount":
		value = fmt.Sprintf("MemComp:%d Level0Comp:%d NonLevel0Comp:%d SeekComp:%d", atomic.LoadUint32(&db.memComp), atomic.LoadUint32(&db.level0Comp), atomic.LoadUint32(&db.nonLevel0Comp), atomic.LoadUint32(&db.seekComp))
	case p == "iostats":
		value = fmt.Sprintf("Read(MB):%.5f Write(MB):%.5f",
			float64(db.s.stor.reads())/1048576.0,
			float64(db.s.stor.writes())/1048576.0)
	case p == "writedelay":
		writeDelayN, writeDelay := atomic.LoadInt32(&db.cWriteDelayN), time.Duration(atomic.LoadInt64(&db.cWriteDelay))
		paused := atomic.LoadInt32(&db.inWritePaused) == 1
		value = fmt.Sprintf("DelayN:%d Delay:%s Paused:%t", writeDelayN, writeDelay, paused)
	case p == "sstables":
		for level, tables := range v.levels {
			value += fmt.Sprintf("--- level %d ---\n", level)
			for _, t := range tables {
				value += fmt.Sprintf("%d:%d[%q .. %q]\n", t.fd.Num, t.size, t.imin, t.imax)
			}
		}
	case p == "blockpool":
		value = fmt.Sprintf("%v", db.s.tops.bpool)
	case p == "cachedblock":
		if db.s.tops.bcache != nil {
			value = fmt.Sprintf("%d", db.s.tops.bcache.Size())
		} else {
			value = "<nil>"
		}
	case p == "openedtables":
		value = fmt.Sprintf("%d", db.s.tops.cache.Size())
	case p == "alivesnaps":
		value = fmt.Sprintf("%d", atomic.LoadInt32(&db.aliveSnaps))
	case p == "aliveiters":
		value = fmt.Sprintf("%d", atomic.LoadInt32(&db.aliveIters))
	default:
		err = ErrNotFound
	}

	return
}