def parse(self):
        try:
            if self.message_type == ParserMessageType.STRING:
                msg = email.message_from_string(self.raw_message, Message)
            elif self.message_type == ParserMessageType.BYTES:
                msg = email.message_from_bytes(self.raw_message, Message)
            elif self.message_type == ParserMessageType.BINARY_FILE:
                msg = email.message_from_binary_file(self.raw_message, Message)
            else:
                raise ValueError("Invalid message_type, could not parse message.")
        except Exception:
            raise ParseEmailException

        # Do basic post-processing of the message, checking it for defects or
        # other missing information.
        if msg.defects:
            raise DefectMessageException

        # Add headers used by LEGO
        msg.original_size = len(self.raw_message)
        msg["X-MailFrom"] = self.mail_from

        return msg 

def __init__(self, message=None):
        """Initialize a Message instance."""
        if isinstance(message, email.message.Message):
            self._become_message(copy.deepcopy(message))
            if isinstance(message, Message):
                message._explain_to(self)
        elif isinstance(message, bytes):
            self._become_message(email.message_from_bytes(message))
        elif isinstance(message, str):
            self._become_message(email.message_from_string(message))
        elif isinstance(message, io.TextIOWrapper):
            self._become_message(email.message_from_file(message))
        elif hasattr(message, "read"):
            self._become_message(email.message_from_binary_file(message))
        elif message is None:
            email.message.Message.__init__(self)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def __init__(self, message=None):
        """Initialize a Message instance."""
        if isinstance(message, email.message.Message):
            self._become_message(copy.deepcopy(message))
            if isinstance(message, Message):
                message._explain_to(self)
        elif isinstance(message, bytes):
            self._become_message(email.message_from_bytes(message))
        elif isinstance(message, str):
            self._become_message(email.message_from_string(message))
        elif isinstance(message, io.TextIOWrapper):
            self._become_message(email.message_from_file(message))
        elif hasattr(message, "read"):
            self._become_message(email.message_from_binary_file(message))
        elif message is None:
            email.message.Message.__init__(self)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def __init__(self, message=None):
        """Initialize a Message instance."""
        if isinstance(message, email.message.Message):
            self._become_message(copy.deepcopy(message))
            if isinstance(message, Message):
                message._explain_to(self)
        elif isinstance(message, bytes):
            self._become_message(email.message_from_bytes(message))
        elif isinstance(message, str):
            self._become_message(email.message_from_string(message))
        elif isinstance(message, io.TextIOWrapper):
            self._become_message(email.message_from_file(message))
        elif hasattr(message, "read"):
            self._become_message(email.message_from_binary_file(message))
        elif message is None:
            email.message.Message.__init__(self)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def __init__(self, message=None):
        """Initialize a Message instance."""
        if isinstance(message, email.message.Message):
            self._become_message(copy.deepcopy(message))
            if isinstance(message, Message):
                message._explain_to(self)
        elif isinstance(message, bytes):
            self._become_message(email.message_from_bytes(message))
        elif isinstance(message, str):
            self._become_message(email.message_from_string(message))
        elif isinstance(message, io.TextIOWrapper):
            self._become_message(email.message_from_file(message))
        elif hasattr(message, "read"):
            self._become_message(email.message_from_binary_file(message))
        elif message is None:
            email.message.Message.__init__(self)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def __init__(self, message=None):
        """Initialize a Message instance."""
        if isinstance(message, email.message.Message):
            self._become_message(copy.deepcopy(message))
            if isinstance(message, Message):
                message._explain_to(self)
        elif isinstance(message, bytes):
            self._become_message(email.message_from_bytes(message))
        elif isinstance(message, str):
            self._become_message(email.message_from_string(message))
        elif isinstance(message, io.TextIOWrapper):
            self._become_message(email.message_from_file(message))
        elif hasattr(message, "read"):
            self._become_message(email.message_from_binary_file(message))
        elif message is None:
            email.message.Message.__init__(self)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _parse_email_fixture(self, fixture_path: str) -> EmailMessage:
        if not self._does_fixture_path_exist(fixture_path):
            raise CommandError(f'Fixture {fixture_path} does not exist')

        if fixture_path.endswith('.json'):
            return self._parse_email_json_fixture(fixture_path)
        else:
            with open(fixture_path, "rb") as fp:
                message = email.message_from_binary_file(fp, policy=email.policy.default)
                assert isinstance(message, EmailMessage)  # https://github.com/python/typeshed/issues/2417
                return message 

def test_file_with_attachement(self):
        with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/test_attachment.eml'), mode='br') as msg:
            imap_client = yield from self.login_user('user@mail', 'pass', select=True)
            mail = Mail(email.message_from_binary_file(msg))

            self.imapserver.receive(mail, imap_user='user@mail')

            result, data = yield from imap_client.fetch('1', '(RFC822)')

            self.assertEqual('OK', result)
            self.assertEqual(['1 FETCH (RFC822 {418898}', mail.as_bytes(), ')', 'FETCH completed.'], data) 

def test_file_sessions(self):
        """Make sure opening a connection creates a new file"""
        msg = EmailMessage(
            'Subject', 'Content', 'bounce@example.com', ['to@example.com'],
            headers={'From': 'from@example.com'},
        )
        connection = mail.get_connection()
        connection.send_messages([msg])

        self.assertEqual(len(os.listdir(self.tmp_dir)), 1)
        with open(os.path.join(self.tmp_dir, os.listdir(self.tmp_dir)[0]), 'rb') as fp:
            message = message_from_binary_file(fp)
        self.assertEqual(message.get_content_type(), 'text/plain')
        self.assertEqual(message.get('subject'), 'Subject')
        self.assertEqual(message.get('from'), 'from@example.com')
        self.assertEqual(message.get('to'), 'to@example.com')

        connection2 = mail.get_connection()
        connection2.send_messages([msg])
        self.assertEqual(len(os.listdir(self.tmp_dir)), 2)

        connection.send_messages([msg])
        self.assertEqual(len(os.listdir(self.tmp_dir)), 2)

        msg.connection = mail.get_connection()
        self.assertTrue(connection.open())
        msg.send()
        self.assertEqual(len(os.listdir(self.tmp_dir)), 3)
        msg.send()
        self.assertEqual(len(os.listdir(self.tmp_dir)), 3)

        connection.close() 

def test_file_sessions(self):
        """Make sure opening a connection creates a new file"""
        msg = EmailMessage(
            'Subject', 'Content', 'bounce@example.com', ['to@example.com'],
            headers={'From': 'from@example.com'},
        )
        connection = mail.get_connection()
        connection.send_messages([msg])

        self.assertEqual(len(os.listdir(self.tmp_dir)), 1)
        with open(os.path.join(self.tmp_dir, os.listdir(self.tmp_dir)[0]), 'rb') as fp:
            message = message_from_binary_file(fp)
        self.assertEqual(message.get_content_type(), 'text/plain')
        self.assertEqual(message.get('subject'), 'Subject')
        self.assertEqual(message.get('from'), 'from@example.com')
        self.assertEqual(message.get('to'), 'to@example.com')

        connection2 = mail.get_connection()
        connection2.send_messages([msg])
        self.assertEqual(len(os.listdir(self.tmp_dir)), 2)

        connection.send_messages([msg])
        self.assertEqual(len(os.listdir(self.tmp_dir)), 2)

        msg.connection = mail.get_connection()
        self.assertTrue(connection.open())
        msg.send()
        self.assertEqual(len(os.listdir(self.tmp_dir)), 3)
        msg.send()
        self.assertEqual(len(os.listdir(self.tmp_dir)), 3)

        connection.close() 

def message_from_binary_file(s, *args, **kw):
    f = io.BytesIO(s.encode())
    return email.message_from_binary_file(f, *args, **kw)