def connect(
        self,
        request=None,
        response=None,
        db=None,
        tablename='web2py_session',
        masterapp=None,
        migrate=True,
        separate=None,
        check_client=False,
        cookie_key=None,
        cookie_expires=None,
        compression_level=None
    ):
        """
        Used in models, allows to customize Session handling

        Args:
            request: the request object
            response: the response object
            db: to store/retrieve sessions in db (a table is created)
            tablename(str): table name
            masterapp(str): points to another's app sessions. This enables a
                "SSO" environment among apps
            migrate: passed to the underlying db
            separate: with True, creates a folder with the 2 initials of the
                session id. Can also be a function, e.g. ::

                    separate=lambda(session_name): session_name[-2:]

            check_client: if True, sessions can only come from the same ip
            cookie_key(str): secret for cookie encryption
            cookie_expires: sets the expiration of the cookie
            compression_level(int): 0-9, sets zlib compression on the data
                before the encryption
        """
        request = request or current.request
        response = response or current.response
        masterapp = masterapp or request.application
        cookies = request.cookies

        self._unlock(response)

        response.session_masterapp = masterapp
        response.session_id_name = 'session_id_%s' % masterapp.lower()
        response.session_data_name = 'session_data_%s' % masterapp.lower()
        response.session_cookie_expires = cookie_expires
        response.session_client = str(request.client).replace(':', '.')
        response.session_cookie_key = cookie_key
        response.session_cookie_compression_level = compression_level

        # check if there is a session_id in cookies
        try:
            old_session_id = cookies[response.session_id_name].value
        except KeyError:
            old_session_id = None
        response.session_id = old_session_id

        # if we are supposed to use cookie based session data
        if cookie_key:
            response.session_storage_type = 'cookie'
        elif db:
            response.session_storage_type = 'db'
        else:
            response.session_storage_type = 'file'
            # why do we do this?
            # because connect may be called twice, by web2py and in models.
            # the first time there is no db yet so it should do nothing
            if (global_settings.db_sessions is True or
                masterapp in global_settings.db_sessions):
                return

        if response.session_storage_type == 'cookie':
            # check if there is session data in cookies
            if cookies in response.session_data_name:
                session_cookie_data = cookies[response.session_data_name].value
            else:
                session_cookie_data = None
            if session_cookie_data:
                data = secure_loads(session_cookie_data, cookie_key,
                                    compression_level=compression_level)
                if data:
                    self.update(data)
            response.session_id = True

        # else if we are supposed to use file based sessions
        elif response.session_storage_type == 'file':
            response.session_new = False
            response.session_file = None
            # check if the session_id points to a valid sesion filename
            if response.session_id:
                if not regex_session_id.match(response.session_id):
                    response.session_id = None
                else:
                    response.session_filename = \
                        os.path.join(up(request.folder), masterapp,
                                     'sessions', response.session_id)
                    try:
                        response.session_file = \
                            open(response.session_filename, 'rb+')
                        portalocker.lock(response.session_file,
                                         portalocker.LOCK_EX)
                        response.session_locked = True
                        self.update(cPickle.load(response.session_file))
                        response.session_file.seek(0)
                        oc = response.session_filename.split('/')[-1].split('-')[0]
                        if check_client and response.session_client != oc:
                            raise Exception("cookie attack")
                    except:
                        response.session_id = None
            if not response.session_id:
                uuid = web2py_uuid()
                response.session_id = '%s-%s' % (response.session_client, uuid)
                separate = separate and (lambda session_name: session_name[-2:])
                if separate:
                    prefix = separate(response.session_id)
                    response.session_id = '%s/%s' % (prefix, response.session_id)
                response.session_filename = \
                    os.path.join(up(request.folder), masterapp,
                                 'sessions', response.session_id)
                response.session_new = True

        # else the session goes in db
        elif response.session_storage_type == 'db':
            if global_settings.db_sessions is not True:
                global_settings.db_sessions.add(masterapp)
            # if had a session on file alreday, close it (yes, can happen)
            if response.session_file:
                self._close(response)
            # if on GAE tickets go also in DB
            if settings.global_settings.web2py_runtime_gae:
                request.tickets_db = db
            if masterapp == request.application:
                table_migrate = migrate
            else:
                table_migrate = False
            tname = tablename + '_' + masterapp
            table = db.get(tname, None)
            Field = db.Field
            if table is None:
                db.define_table(
                    tname,
                    Field('locked', 'boolean', default=False),
                    Field('client_ip', length=64),
                    Field('created_datetime', 'datetime',
                          default=request.now),
                    Field('modified_datetime', 'datetime'),
                    Field('unique_key', length=64),
                    Field('session_data', 'blob'),
                    migrate=table_migrate,
                )
                table = db[tname]  # to allow for lazy table
            response.session_db_table = table
            if response.session_id:
                # Get session data out of the database
                try:
                    (record_id, unique_key) = response.session_id.split(':')
                    record_id = long(record_id)
                except (TypeError,ValueError):
                    record_id = None

                # Select from database
                if record_id:
                    row = table(record_id, unique_key=unique_key)
                    # Make sure the session data exists in the database
                    if row:
                        # rows[0].update_record(locked=True)
                        # Unpickle the data
                        session_data = cPickle.loads(row.session_data)
                        self.update(session_data)
                        response.session_new = False
                    else:
                        record_id = None
                if record_id:
                    response.session_id = '%s:%s' % (record_id, unique_key)
                    response.session_db_unique_key = unique_key
                    response.session_db_record_id = record_id
                else:
                    response.session_id = None
                    response.session_new = True
            # if there is no session id yet, we'll need to create a 
            # new session
            else:
                response.session_new = True

        # set the cookie now if you know the session_id so user can set
        # cookie attributes in controllers/models
        # cookie will be reset later
        # yet cookie may be reset later
        #   Removed comparison between old and new session ids - should send
        #    the cookie all the time
        if isinstance(response.session_id,str):
            response.cookies[response.session_id_name] = response.session_id
            response.cookies[response.session_id_name]['path'] = '/'
            if cookie_expires:
                response.cookies[response.session_id_name]['expires'] = \
                    cookie_expires.strftime(FMT)

        session_pickled = cPickle.dumps(self)
        response.session_hash = hashlib.md5(session_pickled).hexdigest()

        if self.flash:
            (response.flash, self.flash) = (self.flash, None)
dataset/ETHPy150Open uwdata/termite-data-server/web2py/gluon/globals.py/Session.connect/swapped operands of `in`