/usr/lib/python3/dist-packages/tornadio2/sessioncontainer.py is in python3-tornadio2 0.0.4-1.
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#
# Copyright: (c) 2011 by the Serge S. Koval, see AUTHORS for more details.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
tornadio2.sessioncontainer
~~~~~~~~~~~~~~~~~~~~~~~~~~
Simple heapq-based session implementation with sliding expiration window
support.
"""
from heapq import heappush, heappop
from time import time
from hashlib import md5
from random import random
def _random_key():
"""Return random session key"""
i = md5()
# Python 3 requires bytes not string, hence the encode
i.update(('%s%s' % (random(), time())).encode('utf-8'))
return i.hexdigest().encode('utf-8')
class SessionBase(object):
"""Represents one session object stored in the session container.
Derive from this object to store additional data.
"""
def __init__(self, session_id=None, expiry=None):
"""Constructor.
``session_id``
Optional session id. If not provided, will generate
new session id.
``expiry``
Expiration time. If not provided, will never expire.
"""
self.session_id = session_id or _random_key()
self.promoted = None
self.expiry = expiry
if self.expiry is not None:
self.expiry_date = time() + self.expiry
def is_alive(self):
"""Check if session is still alive"""
return self.expiry_date > time()
def promote(self):
"""Mark object as alive, so it won't be collected during next
run of the garbage collector.
"""
if self.expiry is not None:
self.promoted = time() + self.expiry
def on_delete(self, forced):
"""Triggered when object was expired or deleted."""
pass
# Python 2
def __cmp__(self, other):
return cmp(self.expiry_date, other.expiry_date)
# Python 3
def __lt__(self, other):
return self.expiry_date < other.expiry_date
def __repr__(self):
return '%f %s %d' % (getattr(self, 'expiry_date', -1),
self.session_id,
self.promoted or 0)
class SessionContainer(object):
def __init__(self):
self._items = dict()
self._queue = []
def add(self, session):
"""Add session to the container.
`session`
Session object
"""
self._items[session.session_id] = session
if session.expiry is not None:
heappush(self._queue, session)
def get(self, session_id):
"""Return session object or None if it is not available
`session_id`
Session identifier
"""
return self._items.get(session_id, None)
def remove(self, session_id):
"""Remove session object from the container
`session_id`
Session identifier
"""
session = self._items.get(session_id, None)
if session is not None:
session.promoted = -1
session.on_delete(True)
del self._items[session_id]
return True
return False
def expire(self, current_time=None):
"""Expire any old entries
`current_time`
Optional time to be used to clean up queue (can be used in unit tests)
"""
if not self._queue:
return
if current_time is None:
current_time = time()
while self._queue:
# Top most item is not expired yet
top = self._queue[0]
# Early exit if item was not promoted and its expiration time
# is greater than now.
if top.promoted is None and top.expiry_date > current_time:
break
# Pop item from the stack
top = heappop(self._queue)
need_reschedule = (top.promoted is not None
and top.promoted > current_time)
# Give chance to reschedule
if not need_reschedule:
top.promoted = None
top.on_delete(False)
need_reschedule = (top.promoted is not None
and top.promoted > current_time)
# If item is promoted and expiration time somewhere in future
# just reschedule it
if need_reschedule:
top.expiry_date = top.promoted
top.promoted = None
heappush(self._queue, top)
else:
del self._items[top.session_id]
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