243 lines
9.6 KiB
Python
243 lines
9.6 KiB
Python
# IMAP server support
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# Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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from offlineimap import imaplib, imaputil, threadutil
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from threading import *
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import thread
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import __main__
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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):
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if self.getselectedfolder() == mailbox:
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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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class UsefulIMAP4(UsefulIMAPMixIn, imaplib.IMAP4): pass
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class UsefulIMAP4_SSL(UsefulIMAPMixIn, imaplib.IMAP4_SSL): pass
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class UsefulIMAP4_Tunnel(UsefulIMAPMixIn, imaplib.IMAP4_Tunnel): pass
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class IMAPServer:
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def __init__(self, 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.username = username
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self.password = password
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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 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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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 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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__main__.ui.connecting(self.hostname, self.port)
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# Generate a new connection.
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if self.tunnel:
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imapobj = UsefulIMAP4_Tunnel(self.tunnel)
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elif self.usessl:
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imapobj = UsefulIMAP4_SSL(self.hostname, self.port)
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else:
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imapobj = UsefulIMAP4(self.hostname, self.port)
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if not self.tunnel:
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imapobj.login(self.username, self.password)
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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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while 1:
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event.wait(timeout)
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if event.isSet():
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return
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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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threads = []
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imapobjs = []
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for i in range(numconnections):
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imapobj = self.acquireconnection()
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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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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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for imapobj in imapobjs:
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self.releaseconnection(imapobj)
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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, config, accountname, 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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host = config.get(accountname, "remotehost")
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user = config.get(accountname, "remoteuser")
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port = None
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if config.has_option(accountname, "remoteport"):
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port = config.getint(accountname, "remoteport")
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ssl = config.getboolean(accountname, "ssl")
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usetunnel = config.has_option(accountname, "preauthtunnel")
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reference = '""'
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if config.has_option(accountname, "reference"):
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reference = config.get(accountname, "reference")
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server = None
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password = None
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if accountname in passwordhash:
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password = passwordhash[accountname]
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# Connect to the remote server.
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if usetunnel:
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IMAPServer.__init__(self,
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tunnel = config.get(accountname, "preauthtunnel"),
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reference = reference,
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maxconnections = config.getint(accountname, "maxconnections"))
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else:
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if not password:
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password = config.get(accountname, 'remotepass')
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IMAPServer.__init__(self, user, password, host, port, ssl,
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config.getint(accountname, "maxconnections"),
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reference = reference)
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