def validate(self, raw_data):
"""Convert from raw to internal FixMessage and validate it."""
data = FixMessage.from_raw(raw_data)
if not data.validate():
logging.warning("disgarding message: %s", data)
return None
if data[0].find(self.version) == -1:
# first contains wrong version number
raise exc.SessionError, (exc.S_EVERSION)
return data
