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# Copyright (C) 2009-2010 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman 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 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman 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
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Fake MTA for testing purposes."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'FakeMTA',
]
import logging
from Queue import Empty, Queue
from lazr.smtptest.controller import QueueController
from lazr.smtptest.server import Channel, QueueServer
from zope.interface import implements
from mailman.interfaces.mta import IMailTransportAgentAliases
log = logging.getLogger('lazr.smtptest')
class FakeMTA:
"""Fake MTA for testing purposes."""
implements(IMailTransportAgentAliases)
def create(self, mlist):
pass
def delete(self, mlist):
pass
def regenerate(self, output=None):
pass
class StatisticsChannel(Channel):
"""A channel that can answers to the fake STAT command."""
def smtp_STAT(self, arg):
"""Cause the server to send statistics to its controller."""
self._server.send_statistics()
self.push(b'250 Ok')
def smtp_RCPT(self, arg):
"""For testing, sometimes cause a non-25x response."""
code = self._server.next_error('rcpt')
if code is None:
# Everything's cool.
Channel.smtp_RCPT(self, arg)
else:
# The test suite wants this to fail. The message corresponds to
# the exception we expect smtplib.SMTP to raise.
self.push(b'%d Error: SMTPRecipientsRefused' % code)
def smtp_MAIL(self, arg):
"""For testing, sometimes cause a non-25x response."""
code = self._server.next_error('mail')
if code is None:
# Everything's cool.
Channel.smtp_MAIL(self, arg)
else:
# The test suite wants this to fail. The message corresponds to
# the exception we expect smtplib.SMTP to raise.
self.push(b'%d Error: SMTPResponseException' % code)
class ConnectionCountingServer(QueueServer):
"""Count the number of SMTP connections opened."""
def __init__(self, host, port, queue, oob_queue, err_queue):
"""See `lazr.smtptest.server.QueueServer`.
:param oob_queue: A queue for communicating information back to the
controller, e.g. statistics.
:type oob_queue: `Queue.Queue`
:param err_queue: A queue for allowing the controller to request SMTP
errors from the server.
:type err_queue: `Queue.Queue`
"""
QueueServer.__init__(self, host, port, queue)
self._connection_count = 0
# The out-of-band queue is where the server sends statistics to the
# controller upon request.
self._oob_queue = oob_queue
self._err_queue = err_queue
self._last_error = None
def next_error(self, command):
"""Return the next error for the SMTP command, if there is one.
:param command: The SMTP command for which an error might be
expected. If the next error matches the given command, the
expected error code is returned.
:type command: string, lower-cased
:return: An SMTP error code
:rtype: integer
"""
# If the last error we pulled from the queue didn't match, then we're
# caching it, and it might match this expected error. If there is no
# last error in the cache, get one from the queue now.
if self._last_error is None:
try:
self._last_error = self._err_queue.get_nowait()
except Empty:
# No error is expected
return None
if self._last_error[0] == command:
code = self._last_error[1]
self._last_error = None
return code
return None
def handle_accept(self):
"""See `lazr.smtp.server.Server`."""
connection, address = self.accept()
self._connection_count += 1
log.info('[ConnectionCountingServer] accepted: %s', address)
StatisticsChannel(self, connection, address)
def reset(self):
"""See `lazr.smtp.server.Server`."""
QueueServer.reset(self)
self._connection_count = 0
def send_statistics(self):
"""Send the current connection statistics to the controller."""
# Do not count the connection caused by the STAT connect.
self._connection_count -= 1
self._oob_queue.put(self._connection_count)
class ConnectionCountingController(QueueController):
"""Count the number of SMTP connections opened."""
def __init__(self, host, port):
"""See `lazr.smtptest.controller.QueueController`."""
self.oob_queue = Queue()
self.err_queue = Queue()
QueueController.__init__(self, host, port)
def _make_server(self, host, port):
"""See `lazr.smtptest.controller.QueueController`."""
self.server = ConnectionCountingServer(
host, port, self.queue, self.oob_queue, self.err_queue)
def start(self):
"""See `lazr.smtptest.controller.QueueController`."""
QueueController.start(self)
# Reset the connection statistics, since the base class's start()
# method causes a connection to occur.
self.reset()
def get_connection_count(self):
"""Retrieve the number of connections.
:return: The number of connections to the server that have been made.
:rtype: integer
"""
smtpd = self._connect()
smtpd.docmd(b'STAT')
# An Empty exception will occur if the data isn't available in 10
# seconds. Let that propagate.
return self.oob_queue.get(block=True, timeout=10)
@property
def messages(self):
"""Return all the messages received by the SMTP server."""
for message in self:
yield message
def clear(self):
"""Clear all the messages from the queue."""
list(self)
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