1ebc45d963
Added WrappedIMAP4_SSL class to help fix up performance of SSL Standard imaplib.py is really bad with this, since it reads one character at a time. Reported by Aaron Kaplan at http://lists.complete.org/offlineimap@complete.org/2008/01/msg00012.html.gz He wrote: I just noticed that the version of offlineimap I've been using (3.99.17) is well over four years old. How time flies. I haven't had any problems with it, but out of curiosity I decided to pull in 5.99.2 from the fedora repository. It turns out to take consistently over twice as long as the old version to sync the same account. Is this expected? He tracked it down at http://lists.complete.org/offlineimap@complete.org/2008/02/msg00012.html.gz The following changeset is the one responsible for the difference in speed I was noticing between the imaplib.py that was packaged with older versions of offlineimap and the one that comes with python: * /offlineimap/head: changeset 169 More optimizations -- this time fix readline() to not work character-by-character!
328 lines
13 KiB
Python
328 lines
13 KiB
Python
# IMAP server support
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# Copyright (C) 2002 - 2007 John Goerzen
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# <jgoerzen@complete.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import imaplib
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from offlineimap import imaplibutil, imaputil, threadutil
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from offlineimap.ui import UIBase
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from threading import *
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import thread, hmac, os
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class UsefulIMAPMixIn:
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def getstate(self):
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return self.state
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def getselectedfolder(self):
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if self.getstate() == 'SELECTED':
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return self.selectedfolder
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return None
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def select(self, mailbox='INBOX', readonly=None, force = 0):
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if (not force) and self.getselectedfolder() == mailbox \
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and self.is_readonly == readonly:
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# No change; return.
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return
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result = self.__class__.__bases__[1].select(self, mailbox, readonly)
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if result[0] != 'OK':
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raise ValueError, "Error from select: %s" % str(result)
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if self.getstate() == 'SELECTED':
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self.selectedfolder = mailbox
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else:
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self.selectedfolder = None
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def _mesg(self, s, secs=None):
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imaplibutil.new_mesg(self, s, secs)
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class UsefulIMAP4(UsefulIMAPMixIn, imaplib.IMAP4):
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def open(self, host = '', port = imaplib.IMAP4_PORT):
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imaplibutil.new_open(self, host, port)
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class UsefulIMAP4_SSL(UsefulIMAPMixIn, imaplibutil.WrappedIMAP4_SSL):
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def open(self, host = '', port = imaplib.IMAP4_SSL_PORT):
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imaplibutil.new_open_ssl(self, host, port)
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class UsefulIMAP4_Tunnel(UsefulIMAPMixIn, imaplibutil.IMAP4_Tunnel): pass
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class IMAPServer:
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def __init__(self, config, reposname,
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username = None, password = None, hostname = None,
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port = None, ssl = 1, maxconnections = 1, tunnel = None,
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reference = '""'):
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self.reposname = reposname
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self.config = config
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self.username = username
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self.password = password
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self.passworderror = None
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self.goodpassword = None
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self.hostname = hostname
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self.tunnel = tunnel
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self.port = port
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self.usessl = ssl
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self.delim = None
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self.root = None
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if port == None:
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if ssl:
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self.port = 993
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else:
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self.port = 143
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self.maxconnections = maxconnections
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self.availableconnections = []
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self.assignedconnections = []
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self.lastowner = {}
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self.semaphore = BoundedSemaphore(self.maxconnections)
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self.connectionlock = Lock()
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self.reference = reference
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def getpassword(self):
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if self.goodpassword != None:
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return self.goodpassword
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if self.password != None and self.passworderror == None:
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return self.password
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self.password = UIBase.getglobalui().getpass(self.reposname,
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self.config,
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self.passworderror)
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self.passworderror = None
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return self.password
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def getdelim(self):
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"""Returns this server's folder delimiter. Can only be called
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after one or more calls to acquireconnection."""
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return self.delim
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def getroot(self):
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"""Returns this server's folder root. Can only be called after one
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or more calls to acquireconnection."""
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return self.root
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def releaseconnection(self, connection):
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"""Releases a connection, returning it to the pool."""
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self.connectionlock.acquire()
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self.assignedconnections.remove(connection)
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self.availableconnections.append(connection)
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self.connectionlock.release()
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self.semaphore.release()
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def md5handler(self, response):
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ui = UIBase.getglobalui()
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challenge = response.strip()
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ui.debug('imap', 'md5handler: got challenge %s' % challenge)
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passwd = self.getpassword()
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retval = self.username + ' ' + hmac.new(passwd, challenge).hexdigest()
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ui.debug('imap', 'md5handler: returning %s' % retval)
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return retval
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def plainauth(self, imapobj):
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UIBase.getglobalui().debug('imap',
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'Attempting plain authentication')
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imapobj.login(self.username, self.getpassword())
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def acquireconnection(self):
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"""Fetches a connection from the pool, making sure to create a new one
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if needed, to obey the maximum connection limits, etc.
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Opens a connection to the server and returns an appropriate
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object."""
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self.semaphore.acquire()
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self.connectionlock.acquire()
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imapobj = None
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if len(self.availableconnections): # One is available.
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# Try to find one that previously belonged to this thread
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# as an optimization. Start from the back since that's where
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# they're popped on.
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threadid = thread.get_ident()
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imapobj = None
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for i in range(len(self.availableconnections) - 1, -1, -1):
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tryobj = self.availableconnections[i]
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if self.lastowner[tryobj] == threadid:
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imapobj = tryobj
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del(self.availableconnections[i])
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break
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if not imapobj:
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imapobj = self.availableconnections[0]
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del(self.availableconnections[0])
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self.assignedconnections.append(imapobj)
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self.lastowner[imapobj] = thread.get_ident()
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self.connectionlock.release()
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return imapobj
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self.connectionlock.release() # Release until need to modify data
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success = 0
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while not success:
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# Generate a new connection.
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if self.tunnel:
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UIBase.getglobalui().connecting('tunnel', self.tunnel)
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imapobj = UsefulIMAP4_Tunnel(self.tunnel)
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success = 1
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elif self.usessl:
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UIBase.getglobalui().connecting(self.hostname, self.port)
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imapobj = UsefulIMAP4_SSL(self.hostname, self.port)
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else:
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UIBase.getglobalui().connecting(self.hostname, self.port)
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imapobj = UsefulIMAP4(self.hostname, self.port)
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imapobj.mustquote = imaplibutil.mustquote
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if not self.tunnel:
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try:
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if 'AUTH=CRAM-MD5' in imapobj.capabilities:
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UIBase.getglobalui().debug('imap',
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'Attempting CRAM-MD5 authentication')
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try:
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imapobj.authenticate('CRAM-MD5', self.md5handler)
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except imapobj.error, val:
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self.plainauth(imapobj)
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else:
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self.plainauth(imapobj)
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# Would bail by here if there was a failure.
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success = 1
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self.goodpassword = self.password
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except imapobj.error, val:
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self.passworderror = str(val)
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self.password = None
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if self.delim == None:
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listres = imapobj.list(self.reference, '""')[1]
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if listres == [None] or listres == None:
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# Some buggy IMAP servers do not respond well to LIST "" ""
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# Work around them.
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listres = imapobj.list(self.reference, '"*"')[1]
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self.delim, self.root = \
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imaputil.imapsplit(listres[0])[1:]
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self.delim = imaputil.dequote(self.delim)
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self.root = imaputil.dequote(self.root)
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self.connectionlock.acquire()
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self.assignedconnections.append(imapobj)
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self.lastowner[imapobj] = thread.get_ident()
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self.connectionlock.release()
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return imapobj
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def connectionwait(self):
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"""Waits until there is a connection available. Note that between
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the time that a connection becomes available and the time it is
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requested, another thread may have grabbed it. This function is
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mainly present as a way to avoid spawning thousands of threads
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to copy messages, then have them all wait for 3 available connections.
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It's OK if we have maxconnections + 1 or 2 threads, which is what
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this will help us do."""
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threadutil.semaphorewait(self.semaphore)
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def close(self):
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# Make sure I own all the semaphores. Let the threads finish
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# their stuff. This is a blocking method.
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self.connectionlock.acquire()
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threadutil.semaphorereset(self.semaphore, self.maxconnections)
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for imapobj in self.assignedconnections + self.availableconnections:
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imapobj.logout()
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self.assignedconnections = []
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self.availableconnections = []
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self.lastowner = {}
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self.connectionlock.release()
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def keepalive(self, timeout, event):
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"""Sends a NOOP to each connection recorded. It will wait a maximum
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of timeout seconds between doing this, and will continue to do so
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until the Event object as passed is true. This method is expected
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to be invoked in a separate thread, which should be join()'d after
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the event is set."""
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ui = UIBase.getglobalui()
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ui.debug('imap', 'keepalive thread started')
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while 1:
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ui.debug('imap', 'keepalive: top of loop')
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event.wait(timeout)
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ui.debug('imap', 'keepalive: after wait')
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if event.isSet():
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ui.debug('imap', 'keepalive: event is set; exiting')
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return
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ui.debug('imap', 'keepalive: acquiring connectionlock')
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self.connectionlock.acquire()
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numconnections = len(self.assignedconnections) + \
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len(self.availableconnections)
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self.connectionlock.release()
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ui.debug('imap', 'keepalive: connectionlock released')
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threads = []
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imapobjs = []
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for i in range(numconnections):
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ui.debug('imap', 'keepalive: processing connection %d of %d' % (i, numconnections))
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imapobj = self.acquireconnection()
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ui.debug('imap', 'keepalive: connection %d acquired' % i)
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imapobjs.append(imapobj)
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thr = threadutil.ExitNotifyThread(target = imapobj.noop)
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thr.setDaemon(1)
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thr.start()
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threads.append(thr)
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ui.debug('imap', 'keepalive: thread started')
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ui.debug('imap', 'keepalive: joining threads')
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for thr in threads:
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# Make sure all the commands have completed.
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thr.join()
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ui.debug('imap', 'keepalive: releasing connections')
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for imapobj in imapobjs:
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self.releaseconnection(imapobj)
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ui.debug('imap', 'keepalive: bottom of loop')
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class ConfigedIMAPServer(IMAPServer):
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"""This class is designed for easier initialization given a ConfigParser
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object and an account name. The passwordhash is used if
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passwords for certain accounts are known. If the password for this
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account is listed, it will be obtained from there."""
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def __init__(self, repository, passwordhash = {}):
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"""Initialize the object. If the account is not a tunnel,
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the password is required."""
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self.repos = repository
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self.config = self.repos.getconfig()
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usetunnel = self.repos.getpreauthtunnel()
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if not usetunnel:
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host = self.repos.gethost()
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user = self.repos.getuser()
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port = self.repos.getport()
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ssl = self.repos.getssl()
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reference = self.repos.getreference()
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server = None
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password = None
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if repository.getname() in passwordhash:
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password = passwordhash[repository.getname()]
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# Connect to the remote server.
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if usetunnel:
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IMAPServer.__init__(self, self.config, self.repos.getname(),
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tunnel = usetunnel,
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reference = reference,
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maxconnections = self.repos.getmaxconnections())
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else:
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if not password:
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password = self.repos.getpassword()
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IMAPServer.__init__(self, self.config, self.repos.getname(),
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user, password, host, port, ssl,
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self.repos.getmaxconnections(),
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reference = reference)
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