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badger.go
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badger.go
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package driver
import (
"bytes"
"errors"
"fmt"
. "github.com/Phosmachina/FluentKV/reldb"
"github.com/dgraph-io/badger"
"os"
"runtime"
"sync/atomic"
)
const (
defaultFileMode = 0755
)
type BadgerDB struct {
AbstractRelDB
Service *badger.DB
closed uint32 // if 1 is closed.
}
func NewBadgerDB(directoryPath string) (IRelationalDB, error) {
if directoryPath == "" {
return nil, errors.New("directoryPath is empty")
}
lindex := directoryPath[len(directoryPath)-1]
if lindex != os.PathSeparator && lindex != '/' {
directoryPath += string(os.PathSeparator)
}
// create directories if necessary
if err := os.MkdirAll(directoryPath, os.FileMode(defaultFileMode)); err != nil {
return nil, err
}
opts := badger.DefaultOptions(directoryPath).WithTruncate(true)
service, err := badger.Open(opts)
if err != nil {
fmt.Printf("unable to initialize the badger-based session database: %v", err)
return nil, err
}
db := &BadgerDB{Service: service}
db.AbstractRelDB = *NewAbstractRelDB(db)
runtime.SetFinalizer(db, closeDB)
return db, nil
}
func (db *BadgerDB) Close() {
_ = closeDB(db)
}
func closeDB(db *BadgerDB) error {
if atomic.LoadUint32(&db.closed) > 0 {
return nil
}
err := db.Service.Close()
if err == nil {
atomic.StoreUint32(&db.closed, 1)
}
return err
}
var iterOptionsNoValues = badger.IteratorOptions{
PrefetchValues: false,
PrefetchSize: 100,
Reverse: false,
AllVersions: false,
}
// region IRelationalDB implementation
func (db *BadgerDB) RawSet(prefix string, key string, value []byte) {
err := db.Service.Update(func(txn *badger.Txn) error {
return txn.SetEntry(badger.NewEntry([]byte(prefix+key), value))
})
if err != nil {
// TODO golog.Error(err)
}
}
func (db *BadgerDB) RawGet(prefix string, key string) ([]byte, bool) {
var value []byte
err := db.Service.View(func(txn *badger.Txn) error {
item, err := txn.Get([]byte(prefix + key))
if err != nil {
return err
}
return item.Value(func(v []byte) error {
value = v
return nil
})
})
if errors.Is(err, badger.ErrKeyNotFound) {
return nil, false
}
if err != nil {
// golog.Error(err)
return nil, false
}
return value, true
}
func (db *BadgerDB) RawDelete(prefix string, key string) bool {
txn := db.Service.NewTransaction(true)
err := txn.Delete([]byte(prefix + key))
if err != nil {
// golog.Error(err)
return false
}
return txn.Commit() == nil
}
func (db *BadgerDB) RawIterKey(prefix string, action func(key string) (stop bool)) {
txn := db.Service.NewTransaction(false)
defer txn.Discard()
iter := txn.NewIterator(iterOptionsNoValues)
defer iter.Close()
pfx := []byte(prefix)
for iter.Seek(pfx); iter.ValidForPrefix(pfx); iter.Next() {
if action(string(bytes.TrimPrefix(iter.Item().Key(), pfx))) {
return
}
}
}
func (db *BadgerDB) RawIterKV(prefix string, action func(key string, value []byte) (stop bool)) {
txn := db.Service.NewTransaction(false)
defer txn.Discard()
iter := txn.NewIterator(badger.DefaultIteratorOptions)
defer iter.Close()
pfx := []byte(prefix)
var value []byte
for iter.Seek(pfx); iter.ValidForPrefix(pfx); iter.Next() {
valueCopy, _ := iter.Item().ValueCopy(value)
if action(string(bytes.TrimPrefix(iter.Item().Key(), pfx)), valueCopy) {
return
}
}
}
func (db *BadgerDB) Exist(tableName string, id string) bool {
return db.Service.View(func(txn *badger.Txn) error {
_, err := txn.Get(MakeKey(tableName, id))
return err
}) == nil
}
// endregion