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# Copyright (C) 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""Queue up posts if the SMTP connection fails."""
#
# messages are queued before a delivery attempt takes place
# this ensures that should the system fail for some reason,
# the run_queue process will make delivery attempts later.
#
# so q files have 2 possible states - those that are queued because
# they are currently being delivered by the initial delivery attempt
# and those that are queued because the first delivery attempt has
# failed. the former state is indicated by the fact that the filename
# is setuid. all queue entries in the latter state are not setuid and
# have data in them. Since there's no way in python to create a file
# that is setuid at creation time, all files that are empty are
# considered to be in the first state (after the open call but before
# the chmod call).
#
# protection from multiple processQueue procedures occuring
# simultaneously is enforced by setting a lock file forcing
# only one such process to happen at a time.
#
import os
import stat
import marshal
import errno
import mm_cfg
import Utils
# We need the version of tempfile.py from Python 1.5.2 because it has
# provisions for uniquifying filenames in concurrent children after a fork.
# If not using Python 1.5.2's version, let's get our copy of the new file.
import tempfile
if not hasattr(tempfile, '_pid'):
from Mailman.pythonlib import tempfile
assert hasattr(tempfile, '_pid')
TEMPLATE = "mm_q."
#
# multiple prcesses with different uids can write and/or
# defer q entries. with the queue directory setgid to mailman
# and writable by group mailman, having the QF_MODE set to 0660
# should enable any process with gid mailman to read, write, rename,
# or unlink the file
#
QF_MODE = 0660
#
# how long can a q entry possibly be in the
# active state?
#
MAX_ACTIVE = 7200 # 2 hours
#
# 1) get global lock so only of these
# procedures can run at a time
# 2) find all the files that are deferred queue
# entries and all the files that have been in
# an active state for too long and attempt a delivery
#
def processQueue():
import flock
import time
import Utils
lock_file = flock.FileLock(
os.path.join(mm_cfg.LOCK_DIR, "mmqueue_run.lock"),
# running the queue can take a long time.
hung_timeout=14400)
lock_file.lock()
files = os.listdir(mm_cfg.DATA_DIR)
for file in files:
#
# does it look like a queue entry?
#
if TEMPLATE != file[:len(TEMPLATE)]:
continue
full_fname = os.path.join(mm_cfg.DATA_DIR, file)
#
# we need to stat the file if it still exists (atomically, we can't
# just use use os.path.exists then stat it. if it doesn't exist, it's
# been dequeued since we saw it in the directory listing
#
try:
st = os.stat(full_fname)
except os.error, (code, msg):
if code == errno.ENOENT:
# file does not exist, it's already been dequeued
continue
else:
Utils.reraise()
#
# if the file is not a deferred queue message, we check to see if the
# creation time was too long ago and process it anyway. If the
# creation time was recent, leave it alone as it's probably being
# delivered by another process anyway
#
if (not isDeferred(full_fname, st) and
st[stat.ST_CTIME] > (time.time() - MAX_ACTIVE)):
# then
continue
f = open(full_fname,"r")
recip,sender,text = marshal.load(f)
f.close()
Utils.TrySMTPDelivery(recip,sender,text,full_fname)
lock_file.unlock()
#
# this function is used by any process that
# attempts to deliver a message for the first time
# so the entry is set with the SUID bit. With all these
# concurrent processes calling this function, we can't quite
# trust mktemp() to generate a unique filename, and with the
# possibility of a q entry lasting longer than the pid generation
# cycle on the system we can't quite trust os.getpid() to return
# a unique filename either. but if we use getpid() in the
# template, then mktemp should always return a unique filename.
#
def enqueueMessage(the_sender, recip, text):
tempfile.tempdir = mm_cfg.DATA_DIR
tempfile.template = "%s%d." % (TEMPLATE, os.getpid())
fname = tempfile.mktemp()
#
# open the file so that it is setuid upon creation
#
f = Utils.open_ex(fname, "a+", -1, QF_MODE | stat.S_ISUID)
marshal.dump((recip,the_sender,text),f)
f.close()
return fname
#
# is this queue entry a deferred one?
#
def isDeferred(q_entry, st=None):
if st is None:
st = os.stat(q_entry)
if st[stat.ST_MODE] & stat.S_ISUID:
return 0
else:
return 1
#
# given the full path to a q_entry, set the
# status to deferred if it is not
# already in that state. this function must work
# on entries already in a deferred state.
# this function may only be called by the process
# that called enqueueMessage(), since it uses chmod
#
def deferMessage(q_entry):
if not isDeferred(q_entry):
os.chmod(q_entry, QF_MODE)
#
# given the full path to a q_entry
# remove it from the queue
#
def dequeueMessage(q_entry):
try:
os.unlink(q_entry)
except os.error, (code, msg):
if code == errno.ENOENT:
# file does not exist, probably because the lock was stolen
pass
else:
Utils.reraise()
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