Example #1
0
// aborts transactionsuppressing any errors, and frees
func (e *env) CloseTransaction(t *mdb.Txn) error {
	t.Abort() // ignore error
	e.l.Lock()
	defer e.l.Unlock()
	e.numOpen--
	if e.shouldClose && e.numOpen == 0 && !e.closed {
		e.e.Close()
		e.closed = true
	}
	e.e.Close()
	return nil
}
Example #2
0
// remove
// arg0: dbName
// arg1: key
// returns nil
func remove(args [][]byte, txn *mdb.Txn) ([]byte, error) {
	dbName := string(args[0])
	dbi, err := txn.DBIOpen(&dbName, mdb.CREATE) // create if not exists
	if err != nil {
		txn.Abort()
		return nil, err
	}
	err = txn.Del(dbi, args[1], nil)
	if err != nil {
		txn.Abort()
		return nil, err
	}
	return nil, txn.Commit()
}
Example #3
0
// put
// arg0: dbName
// arg1: key
// arg2: value
// returns nil
func put(args [][]byte, txn *mdb.Txn) ([]byte, error) {
	if len(args) < 3 {
		return nil, fmt.Errorf("Put needs 3 arguments!  Got %d args", len(args))
	}
	dbName := string(args[0])
	dbi, err := txn.DBIOpen(&dbName, mdb.CREATE) // create if not exists
	if err != nil {
		txn.Abort()
		return nil, err
	}
	err = txn.Put(dbi, args[1], args[2], 0)
	if err != nil {
		txn.Abort()
		return nil, err
	}
	err = txn.Commit()
	return nil, err
}
Example #4
0
// remove if set to expected val
// arg0: dbName
// arg1: key
// arg2: expectedVal
// ret:  [1] if removed, [0] otherwise
func compareAndRemove(args [][]byte, txn *mdb.Txn) ([]byte, error) {
	dbName := string(args[0])
	dbi, err := txn.DBIOpen(&dbName, mdb.CREATE) // create if not exists
	existingVal, err := txn.Get(dbi, args[1])
	if err != nil && err != mdb.NotFound {
		txn.Abort()
		return nil, err
	}
	if err == mdb.NotFound || bytesEqual(args[2], existingVal) {
		err = txn.Del(dbi, args[1], nil)
		if err != nil {
			return nil, err
		}
		err = txn.Commit()
		return args[3], err
	} else {
		txn.Abort()
		return existingVal, nil
	}
}
Example #5
0
// transactional get for testing get commands over the wire
// arg0: dbName
// arg1: key
func get(args [][]byte, txn *mdb.Txn) ([]byte, error) {
	if len(args) < 2 {
		return nil, fmt.Errorf("Get needs 2 arguments!  Got %d args", len(args))
	}
	dbName := string(args[0])
	dbi, err := txn.DBIOpen(&dbName, mdb.CREATE) // create if not exists
	if err != nil {
		txn.Abort()
		return nil, err
	}
	ret, err := txn.Get(dbi, args[1])
	if err != nil {
		txn.Abort()
		return nil, err
	}
	txn.Abort()
	return ret, err
}
Example #6
0
// put if not already set
// arg0:  dbName
// arg1:  key
// arg2:  value
// return:  [1] if added, [0] otherwise
func putIfAbsent(args [][]byte, txn *mdb.Txn) ([]byte, error) {
	dbName := string(args[0])
	dbi, err := txn.DBIOpen(&dbName, mdb.CREATE) // create if not exists
	if err != nil {
		txn.Abort()
		return nil, err
	}
	err = txn.Put(dbi, args[1], args[2], mdb.NOOVERWRITE)
	if err == mdb.KeyExist {
		txn.Abort()
		return []byte{0}, nil
	}
	if err != nil {
		txn.Abort()
		return nil, err
	}
	err = txn.Commit()
	return []byte{1}, err
}