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# Copyright (C) 2007 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
"""Implementations of the IPendable and IPending interfaces."""
import sys
import time
import random
import hashlib
import datetime
from storm.locals import *
from zope.interface import implements
from zope.interface.verify import verifyObject
from Mailman.configuration import config
from Mailman.database.model import Model
from Mailman.interfaces import (
IPendable, IPended, IPendedKeyValue, IPendings)
class PendedKeyValue(Model):
"""A pended key/value pair, tied to a token."""
implements(IPendedKeyValue)
def __init__(self, key, value):
self.key = key
self.value = value
id = Int(primary=True)
key = Unicode()
value = Unicode()
pended_id = Int()
class Pended(Model):
"""A pended event, tied to a token."""
implements(IPended)
def __init__(self, token, expiration_date):
self.token = token
self.expiration_date = expiration_date
id = Int(primary=True)
token = RawStr()
expiration_date = DateTime()
key_values = ReferenceSet(id, PendedKeyValue.pended_id)
class UnpendedPendable(dict):
implements(IPendable)
class Pendings(object):
"""Implementation of the IPending interface."""
implements(IPendings)
def add(self, pendable, lifetime=None):
verifyObject(IPendable, pendable)
# Calculate the token and the lifetime.
if lifetime is None:
lifetime = config.PENDING_REQUEST_LIFE
# Calculate a unique token. Algorithm vetted by the Timbot. time()
# has high resolution on Linux, clock() on Windows. random gives us
# about 45 bits in Python 2.2, 53 bits on Python 2.3. The time and
# clock values basically help obscure the random number generator, as
# does the hash calculation. The integral parts of the time values
# are discarded because they're the most predictable bits.
for attempts in range(3):
now = time.time()
x = random.random() + now % 1.0 + time.clock() % 1.0
# Use sha1 because it produces shorter strings.
token = hashlib.sha1(repr(x)).hexdigest()
# In practice, we'll never get a duplicate, but we'll be anal
# about checking anyway.
if config.db.store.find(Pended, token=token).count() == 0:
break
else:
raise AssertionError('Could not find a valid pendings token')
# Create the record, and then the individual key/value pairs.
pending = Pended(
token=token,
expiration_date=datetime.datetime.now() + lifetime)
for key, value in pendable.items():
if isinstance(key, str):
key = unicode(key, 'utf-8')
if isinstance(value, str):
value = unicode(value, 'utf-8')
elif type(value) is int:
value = u'__builtin__.int\1%s' % value
elif type(value) is float:
value = u'__builtin__.float\1%s' % value
elif type(value) is bool:
value = u'__builtin__.bool\1%s' % value
keyval = PendedKeyValue(key=key, value=value)
pending.key_values.add(keyval)
config.db.store.add(pending)
return token
def confirm(self, token, expunge=True):
store = config.db.store
pendings = store.find(Pended, token=token)
if pendings.count() == 0:
return None
assert pendings.count() == 1, (
'Unexpected token count: %d' % pendings.count())
pending = pendings[0]
pendable = UnpendedPendable()
# Find all PendedKeyValue entries that are associated with the pending
# object's ID. Watch out for type conversions.
for keyvalue in store.find(PendedKeyValue,
PendedKeyValue.pended_id == pending.id):
if keyvalue.value is not None and '\1' in keyvalue.value:
typename, value = keyvalue.value.split('\1', 1)
package, classname = typename.rsplit('.', 1)
__import__(package)
module = sys.modules[package]
pendable[keyvalue.key] = getattr(module, classname)(value)
else:
pendable[keyvalue.key] = keyvalue.value
if expunge:
store.remove(keyvalue)
if expunge:
store.remove(pending)
return pendable
def evict(self):
store = config.db.store
now = datetime.datetime.now()
for pending in store.find(Pended):
if pending.expiration_date < now:
# Find all PendedKeyValue entries that are associated with the
# pending object's ID.
q = store.find(PendedKeyValue,
PendedKeyValue.pended_id == pending.id)
for keyvalue in q:
store.remove(keyvalue)
store.remove(pending)
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