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leveldb.go
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leveldb.go
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// Copyright 2017 Factom Foundation
// Use of this source code is governed by the MIT
// license that can be found in the LICENSE file.
package leveldb
import (
"fmt"
"os"
"strings"
"sync"
"strconv"
"github.com/FactomProject/factomd/common/interfaces"
"github.com/FactomProject/goleveldb/leveldb"
"github.com/FactomProject/goleveldb/leveldb/opt"
"github.com/FactomProject/goleveldb/leveldb/util"
)
type LevelDB struct {
// lock preventing multiple entry
dbLock sync.RWMutex
lDB *leveldb.DB
lbatch *leveldb.Batch
ro *opt.ReadOptions
wo *opt.WriteOptions
}
var _ interfaces.IDatabase = (*LevelDB)(nil)
func (db *LevelDB) ListAllBuckets() ([][]byte, error) {
//TODO: fix Level to solve this issue
return nil, fmt.Errorf("Unable to fetch buckets due to LevelDB design")
/*
db.dbLock.RLock()
defer db.dbLock.RUnlock()
answer := [][]byte{}
iter := db.lDB.NewIterator(&util.Range{Start: nil, Limit: nil}, db.ro)
for iter.Next() {
k := iter.Key()
//Assuming bucket is only 1 byte long!
answer = append(answer, k[:1])
}
iter.Release()
err := iter.Error()
if err != nil {
return nil, err
}
return answer, nil*/
}
// Can't trim a real database
func (db *LevelDB) Trim() {
cache, _ := db.lDB.GetProperty("leveldb.cachedblock")
v, err := strconv.Atoi(cache)
if err == nil {
LevelDBCacheblock.Set(float64(v))
}
}
func (db *LevelDB) Delete(bucket []byte, key []byte) error {
db.dbLock.Lock()
defer db.dbLock.Unlock()
ldbKey := CombineBucketAndKey(bucket, key)
err := db.lDB.Delete(ldbKey, db.wo)
return err
}
func (db *LevelDB) Close() error {
db.dbLock.Lock()
defer db.dbLock.Unlock()
return db.lDB.Close()
}
func ExtendBucket(bucket []byte) []byte {
return append(bucket, ';')
}
func CombineBucketAndKey(bucket []byte, key []byte) []byte {
ldbKey := ExtendBucket(bucket)
ldbKey = append(ldbKey, key...)
return ldbKey
}
func (db *LevelDB) Get(bucket []byte, key []byte, destination interfaces.BinaryMarshallable) (interfaces.BinaryMarshallable, error) {
db.dbLock.RLock()
defer db.dbLock.RUnlock()
LevelDBGets.Inc()
ldbKey := CombineBucketAndKey(bucket, key)
data, err := db.lDB.Get(ldbKey, db.ro)
if err != nil {
if strings.Contains(err.Error(), "not found") {
return nil, nil
}
return nil, err
}
_, err = destination.UnmarshalBinaryData(data)
if err != nil {
return nil, err
}
return destination, nil
}
func (db *LevelDB) Put(bucket []byte, key []byte, data interfaces.BinaryMarshallable) error {
db.dbLock.Lock()
defer db.dbLock.Unlock()
if db.lbatch == nil {
db.lbatch = new(leveldb.Batch)
}
defer db.lbatch.Reset()
LevelDBPuts.Inc()
ldbKey := CombineBucketAndKey(bucket, key)
hex, err := data.MarshalBinary()
if err != nil {
return err
}
db.lbatch.Put(ldbKey, hex)
err = db.lDB.Write(db.lbatch, db.wo)
if err != nil {
return err
}
return nil
}
func (db *LevelDB) PutInBatch(records []interfaces.Record) error {
db.dbLock.Lock()
defer db.dbLock.Unlock()
if db.lbatch == nil {
db.lbatch = new(leveldb.Batch)
}
defer db.lbatch.Reset()
for _, v := range records {
ldbKey := CombineBucketAndKey(v.Bucket, v.Key)
hex, err := v.Data.MarshalBinary()
if err != nil {
return err
}
db.lbatch.Put(ldbKey, hex)
LevelDBPuts.Inc()
}
err := db.lDB.Write(db.lbatch, db.wo)
if err != nil {
return err
}
return nil
}
func (db *LevelDB) Clear(bucket []byte) error {
keys, err := db.ListAllKeys(bucket)
if err != nil {
return err
}
db.dbLock.Lock()
defer db.dbLock.Unlock()
if db.lbatch == nil {
db.lbatch = new(leveldb.Batch)
}
defer db.lbatch.Reset()
for _, key := range keys {
ldbKey := CombineBucketAndKey(bucket, key)
db.lbatch.Delete(ldbKey)
}
err = db.lDB.Write(db.lbatch, db.wo)
if err != nil {
return err
}
return nil
}
func (db *LevelDB) ListAllKeys(bucket []byte) (keys [][]byte, err error) {
db.dbLock.RLock()
defer db.dbLock.RUnlock()
ldbKey := ExtendBucket(bucket)
var fromKey []byte = ldbKey[:]
var toKey []byte = ldbKey[:]
toKey = addOneToByteArray(toKey)
iter := db.lDB.NewIterator(&util.Range{Start: fromKey, Limit: toKey}, db.ro)
var answer [][]byte
for iter.Next() {
key := iter.Key()
tmp := make([]byte, len(key[len(ldbKey):]))
copy(tmp, key[len(ldbKey):])
answer = append(answer, tmp)
}
iter.Release()
err = iter.Error()
if err != nil {
return nil, err
}
return answer, nil
}
func (db *LevelDB) GetAll(bucket []byte, sample interfaces.BinaryMarshallableAndCopyable) ([]interfaces.BinaryMarshallableAndCopyable, [][]byte, error) {
db.dbLock.RLock()
defer db.dbLock.RUnlock()
ldbKey := ExtendBucket(bucket)
var fromKey []byte = ldbKey[:]
var toKey []byte = ldbKey[:]
toKey = addOneToByteArray(toKey)
iter := db.lDB.NewIterator(&util.Range{Start: fromKey, Limit: toKey}, db.ro)
answer := []interfaces.BinaryMarshallableAndCopyable{}
keys := [][]byte{}
for iter.Next() {
v := iter.Value()
vCopy := make([]byte, len(v))
copy(vCopy, v)
tmp := sample.New()
err := tmp.UnmarshalBinary(vCopy)
if err != nil {
return nil, nil, err
}
k := make([]byte, len(iter.Key())-len(ldbKey))
copy(k, iter.Key()[len(ldbKey):])
keys = append(keys, k)
answer = append(answer, tmp)
}
iter.Release()
err := iter.Error()
if err != nil {
return nil, nil, err
}
return answer, keys, nil
}
func NewLevelDB(filename string, create bool) (interfaces.IDatabase, error) {
db := new(LevelDB)
var err error
var tlDB *leveldb.DB
if create == true {
err = os.MkdirAll(filename, 0750)
if err != nil {
return nil, err
}
} else {
_, err = os.Stat(filename)
if err != nil {
return nil, err
}
}
opts := &opt.Options{
OpenFilesCacheCapacity: 50, //this solves the "too many files open problem. macs have a default of 250 max open files.
// setting this lower lessens contention with other programs for the scarce open file limit.
}
tlDB, err = leveldb.OpenFile(filename, opts)
if err != nil {
return nil, err
}
db.lDB = tlDB
return db, nil
}
// Internal db use only
func addOneToByteArray(input []byte) (output []byte) {
if input == nil {
return []byte{byte(1)}
}
output = make([]byte, len(input))
copy(output, input)
for i := len(input); i > 0; i-- {
if output[i-1] <= 255 {
output[i-1] = output[i-1] + 1
break
}
}
return output
}
func (db *LevelDB) DoesKeyExist(bucket, key []byte) (bool, error) {
ldbKey := CombineBucketAndKey(bucket, key)
return db.lDB.Has(ldbKey, db.ro)
}