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147 lines
2.8 KiB
147 lines
2.8 KiB
package db
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import (
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"fmt"
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"path"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/opt"
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. "github.com/tendermint/go-common"
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)
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func init() {
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dbCreator := func(name string, dir string) (DB, error) {
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return NewGoLevelDB(name, dir)
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}
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registerDBCreator(LevelDBBackendStr, dbCreator, false)
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registerDBCreator(GoLevelDBBackendStr, dbCreator, false)
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}
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type GoLevelDB struct {
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db *leveldb.DB
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}
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func NewGoLevelDB(name string, dir string) (*GoLevelDB, error) {
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dbPath := path.Join(dir, name+".db")
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db, err := leveldb.OpenFile(dbPath, nil)
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if err != nil {
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return nil, err
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}
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database := &GoLevelDB{db: db}
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return database, nil
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}
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func (db *GoLevelDB) Get(key []byte) []byte {
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res, err := db.db.Get(key, nil)
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if err != nil {
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if err == errors.ErrNotFound {
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return nil
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} else {
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PanicCrisis(err)
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}
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}
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return res
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}
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func (db *GoLevelDB) Set(key []byte, value []byte) {
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err := db.db.Put(key, value, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) SetSync(key []byte, value []byte) {
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err := db.db.Put(key, value, &opt.WriteOptions{Sync: true})
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) Delete(key []byte) {
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err := db.db.Delete(key, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) DeleteSync(key []byte) {
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err := db.db.Delete(key, &opt.WriteOptions{Sync: true})
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) DB() *leveldb.DB {
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return db.db
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}
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func (db *GoLevelDB) Close() {
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db.db.Close()
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}
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func (db *GoLevelDB) Print() {
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str, _ := db.db.GetProperty("leveldb.stats")
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fmt.Printf("%v\n", str)
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iter := db.db.NewIterator(nil, nil)
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for iter.Next() {
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key := iter.Key()
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value := iter.Value()
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fmt.Printf("[%X]:\t[%X]\n", key, value)
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}
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}
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func (db *GoLevelDB) Stats() map[string]string {
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keys := []string{
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"leveldb.num-files-at-level{n}",
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"leveldb.stats",
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"leveldb.sstables",
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"leveldb.blockpool",
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"leveldb.cachedblock",
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"leveldb.openedtables",
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"leveldb.alivesnaps",
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"leveldb.aliveiters",
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}
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stats := make(map[string]string)
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for _, key := range keys {
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str, err := db.db.GetProperty(key)
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if err == nil {
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stats[key] = str
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}
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}
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return stats
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}
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func (db *GoLevelDB) Iterator() Iterator {
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return db.db.NewIterator(nil, nil)
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}
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func (db *GoLevelDB) NewBatch() Batch {
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batch := new(leveldb.Batch)
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return &goLevelDBBatch{db, batch}
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}
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//--------------------------------------------------------------------------------
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type goLevelDBBatch struct {
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db *GoLevelDB
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batch *leveldb.Batch
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}
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func (mBatch *goLevelDBBatch) Set(key, value []byte) {
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mBatch.batch.Put(key, value)
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}
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func (mBatch *goLevelDBBatch) Delete(key []byte) {
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mBatch.batch.Delete(key)
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}
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func (mBatch *goLevelDBBatch) Write() {
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err := mBatch.db.db.Write(mBatch.batch, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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