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# Copyright (C) 2000-2018 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.
"""Outgoing queue runner."""
import os
import sys
import copy
import time
import socket
import email
from Mailman import mm_cfg
from Mailman import Message
from Mailman import Errors
from Mailman import LockFile
from Mailman.Queue.Runner import Runner
from Mailman.Queue.Switchboard import Switchboard
from Mailman.Queue.BounceRunner import BounceMixin
from Mailman.Logging.Syslog import syslog
# This controls how often _doperiodic() will try to deal with deferred
# permanent failures. It is a count of calls to _doperiodic()
DEAL_WITH_PERMFAILURES_EVERY = 10
try:
True, False
except NameError:
True = 1
False = 0
class OutgoingRunner(Runner, BounceMixin):
QDIR = mm_cfg.OUTQUEUE_DIR
def __init__(self, slice=None, numslices=1):
Runner.__init__(self, slice, numslices)
BounceMixin.__init__(self)
# We look this function up only at startup time
modname = 'Mailman.Handlers.' + mm_cfg.DELIVERY_MODULE
mod = __import__(modname)
self._func = getattr(sys.modules[modname], 'process')
# This prevents smtp server connection problems from filling up the
# error log. It gets reset if the message was successfully sent, and
# set if there was a socket.error.
self.__logged = False
self.__retryq = Switchboard(mm_cfg.RETRYQUEUE_DIR)
def _dispose(self, mlist, msg, msgdata):
# See if we should retry delivery of this message again.
deliver_after = msgdata.get('deliver_after', 0)
if time.time() < deliver_after:
return True
# Make sure we have the most up-to-date state
mlist.Load()
try:
pid = os.getpid()
self._func(mlist, msg, msgdata)
# Failsafe -- a child may have leaked through.
if pid <> os.getpid():
syslog('error', 'child process leaked thru: %s', modname)
os._exit(1)
self.__logged = False
except socket.error:
# There was a problem connecting to the SMTP server. Log this
# once, but crank up our sleep time so we don't fill the error
# log.
port = mm_cfg.SMTPPORT
if port == 0:
port = 'smtp'
# Log this just once.
if not self.__logged:
syslog('error', 'Cannot connect to SMTP server %s on port %s',
mm_cfg.SMTPHOST, port)
self.__logged = True
self._snooze(0)
return True
except Errors.SomeRecipientsFailed, e:
# Handle local rejects of probe messages differently.
if msgdata.get('probe_token') and e.permfailures:
self._probe_bounce(mlist, msgdata['probe_token'])
else:
# Delivery failed at SMTP time for some or all of the
# recipients. Permanent failures are registered as bounces,
# but temporary failures are retried for later.
#
# BAW: msg is going to be the original message that failed
# delivery, not a bounce message. This may be confusing if
# this is what's sent to the user in the probe message. Maybe
# we should craft a bounce-like message containing information
# about the permanent SMTP failure?
if e.permfailures:
self._queue_bounces(mlist.internal_name(), e.permfailures,
msg)
# Move temporary failures to the qfiles/retry queue which will
# occasionally move them back here for another shot at
# delivery.
if e.tempfailures:
now = time.time()
recips = e.tempfailures
last_recip_count = msgdata.get('last_recip_count', 0)
deliver_until = msgdata.get('deliver_until', now)
if len(recips) == last_recip_count:
# We didn't make any progress, so don't attempt
# delivery any longer. BAW: is this the best
# disposition?
if now > deliver_until:
return False
else:
# Keep trying to delivery this message for a while
deliver_until = now + mm_cfg.DELIVERY_RETRY_PERIOD
# Don't retry delivery too soon.
deliver_after = now + mm_cfg.DELIVERY_RETRY_WAIT
msgdata['deliver_after'] = deliver_after
msgdata['last_recip_count'] = len(recips)
msgdata['deliver_until'] = deliver_until
msgdata['recips'] = recips
self.__retryq.enqueue(msg, msgdata)
# We've successfully completed handling of this message
return False
_doperiodic = BounceMixin._doperiodic
def _cleanup(self):
BounceMixin._cleanup(self)
Runner._cleanup(self)
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