/
go_badger_db.go
340 lines (292 loc) · 6.43 KB
/
go_badger_db.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package db
import (
"bytes"
log "github.com/33cn/chain33/common/log/log15"
"github.com/33cn/chain33/types"
"github.com/dgraph-io/badger"
"github.com/dgraph-io/badger/options"
)
var blog = log.New("module", "db.gobadgerdb")
//GoBadgerDB db
type GoBadgerDB struct {
BaseDB
db *badger.DB
}
func init() {
dbCreator := func(name string, dir string, cache int) (DB, error) {
return NewGoBadgerDB(name, dir, cache)
}
registerDBCreator(goBadgerDBBackendStr, dbCreator, false)
}
//NewGoBadgerDB new
func NewGoBadgerDB(name string, dir string, cache int) (*GoBadgerDB, error) {
opts := badger.DefaultOptions(dir)
if cache <= 128 {
opts.ValueLogLoadingMode = options.FileIO
//opts.MaxTableSize = int64(cache) << 18 // cache = 128, MaxTableSize = 32M
opts.NumCompactors = 1
opts.NumMemtables = 1
opts.NumLevelZeroTables = 1
opts.NumLevelZeroTablesStall = 2
opts.TableLoadingMode = options.MemoryMap
opts.ValueLogFileSize = 1 << 28 // 256M
}
db, err := badger.Open(opts)
if err != nil {
blog.Error("NewGoBadgerDB", "error", err)
return nil, err
}
return &GoBadgerDB{db: db}, nil
}
//Get get
func (db *GoBadgerDB) Get(key []byte) ([]byte, error) {
var val []byte
err := db.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(key)
if err != nil {
if err == badger.ErrKeyNotFound {
return ErrNotFoundInDb
}
blog.Error("Get", "txn.Get.error", err)
return err
}
//xxxx
val, err = item.ValueCopy(nil)
if err != nil {
blog.Error("Get", "item.Value.error", err)
return err
}
// 兼容leveldb
if val == nil {
val = make([]byte, 0)
}
return nil
})
if err != nil {
return nil, err
}
return val, nil
}
//Set set
func (db *GoBadgerDB) Set(key []byte, value []byte) error {
err := db.db.Update(func(txn *badger.Txn) error {
err := txn.Set(key, value)
return err
})
if err != nil {
blog.Error("Set", "error", err)
return err
}
return nil
}
//SetSync 同步
func (db *GoBadgerDB) SetSync(key []byte, value []byte) error {
err := db.db.Update(func(txn *badger.Txn) error {
err := txn.Set(key, value)
return err
})
if err != nil {
blog.Error("SetSync", "error", err)
return err
}
return nil
}
//Delete 删除
func (db *GoBadgerDB) Delete(key []byte) error {
err := db.db.Update(func(txn *badger.Txn) error {
err := txn.Delete(key)
return err
})
if err != nil {
blog.Error("Delete", "error", err)
return err
}
return nil
}
//DeleteSync 删除同步
func (db *GoBadgerDB) DeleteSync(key []byte) error {
err := db.db.Update(func(txn *badger.Txn) error {
err := txn.Delete(key)
return err
})
if err != nil {
blog.Error("DeleteSync", "error", err)
return err
}
return nil
}
//DB db
func (db *GoBadgerDB) DB() *badger.DB {
return db.db
}
//Close 关闭
func (db *GoBadgerDB) Close() {
err := db.db.Close()
if err != nil {
return
}
}
//Print 打印
func (db *GoBadgerDB) Print() {
// TODO: Returns statistics of the underlying DB
err := db.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 10
it := txn.NewIterator(opts)
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
k := item.Key()
v, err := item.ValueCopy(nil)
if err != nil {
return err
}
blog.Info("Print", "key", string(k), "value", string(v))
//blog.Info("Print", "key", string(item.Key()))
}
return nil
})
if err != nil {
blog.Error("Print", err)
}
}
//Stats ...
func (db *GoBadgerDB) Stats() map[string]string {
//TODO
return nil
}
//Iterator 迭代器
func (db *GoBadgerDB) Iterator(start, end []byte, reverse bool) Iterator {
txn := db.db.NewTransaction(false)
opts := badger.DefaultIteratorOptions
opts.Reverse = reverse
it := txn.NewIterator(opts)
if end == nil {
end = bytesPrefix(start)
}
if bytes.Equal(end, types.EmptyValue) {
end = nil
}
if reverse {
it.Seek(end)
} else {
it.Seek(start)
}
return &goBadgerDBIt{it, itBase{start, end, reverse}, txn, nil}
}
type goBadgerDBIt struct {
*badger.Iterator
itBase
txn *badger.Txn
err error
}
//Next next
func (it *goBadgerDBIt) Next() bool {
it.Iterator.Next()
return it.Valid()
}
//Rewind ...
func (it *goBadgerDBIt) Rewind() bool {
if it.reverse {
it.Seek(it.end)
} else {
it.Seek(it.start)
}
return it.Valid()
}
//Seek 查找
func (it *goBadgerDBIt) Seek(key []byte) bool {
it.Iterator.Seek(key)
return it.Valid()
}
//Close 关闭
func (it *goBadgerDBIt) Close() {
it.Iterator.Close()
it.txn.Discard()
}
//Valid 是否合法
func (it *goBadgerDBIt) Valid() bool {
return it.Iterator.Valid() && it.checkKey(it.Key())
}
func (it *goBadgerDBIt) Key() []byte {
return it.Item().Key()
}
func (it *goBadgerDBIt) Value() []byte {
value, err := it.Item().ValueCopy(nil)
if err != nil {
it.err = err
}
return value
}
func (it *goBadgerDBIt) ValueCopy() []byte {
value, err := it.Item().ValueCopy(nil)
if err != nil {
it.err = err
}
return value
}
func (it *goBadgerDBIt) Error() error {
return it.err
}
//GoBadgerDBBatch batch
type GoBadgerDBBatch struct {
db *GoBadgerDB
batch *badger.Txn
//wop *opt.WriteOptions
size int
len int
}
//NewBatch new
func (db *GoBadgerDB) NewBatch(sync bool) Batch {
batch := db.db.NewTransaction(true)
return &GoBadgerDBBatch{db, batch, 0, 0}
}
//Set set
func (mBatch *GoBadgerDBBatch) Set(key, value []byte) {
err := mBatch.batch.Set(key, value)
if err != nil {
blog.Error("Set", "error", err)
}
mBatch.size += len(value)
mBatch.size += len(key)
mBatch.len += len(value)
}
//Delete 设置
func (mBatch *GoBadgerDBBatch) Delete(key []byte) {
err := mBatch.batch.Delete(key)
if err != nil {
blog.Error("Delete", "error", err)
}
mBatch.size += len(key)
mBatch.len++
}
//Write 写入
func (mBatch *GoBadgerDBBatch) Write() error {
defer mBatch.batch.Discard()
if err := mBatch.batch.Commit(); err != nil {
blog.Error("Write", "error", err)
return err
}
return nil
}
//ValueSize batch大小
func (mBatch *GoBadgerDBBatch) ValueSize() int {
return mBatch.size
}
//ValueLen batch数量
func (mBatch *GoBadgerDBBatch) ValueLen() int {
return mBatch.len
}
//Reset 重置
func (mBatch *GoBadgerDBBatch) Reset() {
if nil != mBatch.db && nil != mBatch.db.db {
mBatch.batch = mBatch.db.db.NewTransaction(true)
}
mBatch.size = 0
mBatch.len = 0
}
// UpdateWriteSync ...
func (mBatch *GoBadgerDBBatch) UpdateWriteSync(sync bool) {
}