e1fb9492f8
Here's the way I'd like to use offlineimap on my laptop:
1. Have a regular cron job running infrequently. The cron job
checks to see
if I'm online, plugged in, and that no other copy of offlineimap is
running. If
all of these conditions are satisfied, it runs offlineimap just once:
"offlineimap -o -u Noninteractive.Quiet"
2. When I start up mutt, I do it by calling a wrapper script that
delays
until cron-started copies of offlineimap have finished, then starts
offlineimap
on its regular, stay-alive and keep checking schedule. When I quit
mutt, the
wrapper script tells offlineimap to stop.
This way I get frequent regular checks while I have mutt running, but
I don't
waste my battery/cpu checking frequently for mail when I'm not
interested in
it.
To make this work, though, it'd be nicer if it were easier to tell
offlineimap,
from the outside, things like "terminate cleanly now" and "when you've
finished
synching, then terminate instead of sleeping and synching again."
OK, to put my money where my mouth is, I attach two patches against
offlineimap
6.0.3.
The first, "cleanup.patch", cleans up a few spots that tend to throw
exceptions
for me as offlineimap is exiting from a KeyboardInterrupt.
The second adds signaling capabilities to offlineimap.
* sending a SIGTERM tells offlineimap to terminate immediately but
cleanly,
just as if "q" had been pressed in the GUI interface
* sending a SIGUSR1 tells every account to do a full sync asap: if
it's
sleeping, then wake up and do the sync now. If it's mid-sync, then
re-synch
any folders whose syncing has already been started or completed, and
continue
to synch the other, queued but not-yet-synched folders.
* sending a SIGHUP tells every account to die as soon as it can (but
not
immediately: only after finishing any synch it's now engaged in)
* sending a SIGUSR2 tells every account to do a full sync asap (as
with
SIGUSR1), then die
It's tricky to mix signals with threads, but I think I've done this
correctly.
I've been using it now for a few weeks without any obvious
problems. But I'm passing it
on so that others can review the code and test it out on their
systems. I developed the
patch when I was running Python 2.5.2, but to my knowledge I don't use
any Python 2.5-specific
code. Now I'm using the patch with Python 2.6.
Although I said "without any obvious problems," let me confess that
I'm
seeing offlineimap regularly choke when I do things like this: start
up
my offlineimap-wrapped copy of mutt, wait a while, put the machine to
sleep (not sure if offlineimap is active in the background or idling),
move to a different spot, wake the machine up again and it acquires a
new network, sometimes a wired network instead of wifi. Offlineimap
doesn't like that so much. I don't yet have any reason to think the
problems here come from my patches. But I'm just acknowledging them,
so
that if others are able to use offlineimap without any difficulty in
situations like I described, then maybe the fault is with my patches.
290 lines
11 KiB
Python
290 lines
11 KiB
Python
# Copyright (C) 2003 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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from offlineimap import threadutil, mbnames, CustomConfig
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import offlineimap.repository.Base, offlineimap.repository.LocalStatus
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from offlineimap.ui import UIBase
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from offlineimap.threadutil import InstanceLimitedThread, ExitNotifyThread
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from threading import Event
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import os
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from subprocess import Popen, PIPE
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def getaccountlist(customconfig):
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return customconfig.getsectionlist('Account')
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def AccountListGenerator(customconfig):
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return [Account(customconfig, accountname)
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for accountname in getaccountlist(customconfig)]
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def AccountHashGenerator(customconfig):
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retval = {}
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for item in AccountListGenerator(customconfig):
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retval[item.getname()] = item
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return retval
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mailboxes = []
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class Account(CustomConfig.ConfigHelperMixin):
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def __init__(self, config, name):
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self.config = config
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self.name = name
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self.metadatadir = config.getmetadatadir()
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self.localeval = config.getlocaleval()
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self.ui = UIBase.getglobalui()
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self.refreshperiod = self.getconffloat('autorefresh', 0.0)
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self.quicknum = 0
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if self.refreshperiod == 0.0:
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self.refreshperiod = None
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def getlocaleval(self):
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return self.localeval
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def getconfig(self):
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return self.config
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def getname(self):
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return self.name
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def getsection(self):
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return 'Account ' + self.getname()
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def sleeper(self, siglistener):
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"""Sleep handler. Returns same value as UIBase.sleep:
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0 if timeout expired, 1 if there was a request to cancel the timer,
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and 2 if there is a request to abort the program.
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Also, returns 100 if configured to not sleep at all."""
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if not self.refreshperiod:
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return 100
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kaobjs = []
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if hasattr(self, 'localrepos'):
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kaobjs.append(self.localrepos)
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if hasattr(self, 'remoterepos'):
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kaobjs.append(self.remoterepos)
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for item in kaobjs:
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item.startkeepalive()
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refreshperiod = int(self.refreshperiod * 60)
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# try:
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# sleepresult = siglistener.get_nowait()
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# # retrieved signal before sleep started
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# if sleepresult == 1:
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# # catching signal 1 here means folders were cleared before signal was posted
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# pass
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# except Empty:
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# sleepresult = self.ui.sleep(refreshperiod, siglistener)
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sleepresult = self.ui.sleep(refreshperiod, siglistener)
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if sleepresult == 1:
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self.quicknum = 0
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# Cancel keepalive
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for item in kaobjs:
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item.stopkeepalive()
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return sleepresult
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class AccountSynchronizationMixin:
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def syncrunner(self, siglistener):
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self.ui.registerthread(self.name)
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self.ui.acct(self.name)
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accountmetadata = self.getaccountmeta()
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if not os.path.exists(accountmetadata):
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os.mkdir(accountmetadata, 0700)
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self.remoterepos = offlineimap.repository.Base.LoadRepository(self.getconf('remoterepository'), self, 'remote')
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# Connect to the local repository.
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self.localrepos = offlineimap.repository.Base.LoadRepository(self.getconf('localrepository'), self, 'local')
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# Connect to the local cache.
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self.statusrepos = offlineimap.repository.LocalStatus.LocalStatusRepository(self.getconf('localrepository'), self)
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if not self.refreshperiod:
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self.sync(siglistener)
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self.ui.acctdone(self.name)
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return
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looping = 1
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while looping:
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self.sync(siglistener)
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looping = self.sleeper(siglistener) != 2
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self.ui.acctdone(self.name)
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def getaccountmeta(self):
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return os.path.join(self.metadatadir, 'Account-' + self.name)
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def sync(self, siglistener):
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# We don't need an account lock because syncitall() goes through
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# each account once, then waits for all to finish.
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hook = self.getconf('presynchook', '')
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self.callhook(hook)
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quickconfig = self.getconfint('quick', 0)
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if quickconfig < 0:
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quick = True
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elif quickconfig > 0:
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if self.quicknum == 0 or self.quicknum > quickconfig:
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self.quicknum = 1
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quick = False
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else:
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self.quicknum = self.quicknum + 1
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quick = True
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else:
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quick = False
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try:
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remoterepos = self.remoterepos
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localrepos = self.localrepos
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statusrepos = self.statusrepos
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self.ui.syncfolders(remoterepos, localrepos)
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remoterepos.syncfoldersto(localrepos, [statusrepos])
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siglistener.addfolders(remoterepos.getfolders(), bool(self.refreshperiod), quick)
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while True:
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folderthreads = []
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for remotefolder, quick in siglistener.queuedfolders():
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thread = InstanceLimitedThread(\
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instancename = 'FOLDER_' + self.remoterepos.getname(),
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target = syncfolder,
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name = "Folder sync %s[%s]" % \
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(self.name, remotefolder.getvisiblename()),
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args = (self.name, remoterepos, remotefolder, localrepos,
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statusrepos, quick))
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thread.setDaemon(1)
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thread.start()
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folderthreads.append(thread)
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threadutil.threadsreset(folderthreads)
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if siglistener.clearfolders():
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break
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mbnames.write()
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localrepos.forgetfolders()
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remoterepos.forgetfolders()
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localrepos.holdordropconnections()
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remoterepos.holdordropconnections()
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finally:
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pass
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hook = self.getconf('postsynchook', '')
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self.callhook(hook)
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def callhook(self, cmd):
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if not cmd:
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return
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try:
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self.ui.callhook("Calling hook: " + cmd)
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p = Popen(cmd, shell=True,
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stdin=PIPE, stdout=PIPE, stderr=PIPE,
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close_fds=True)
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r = p.communicate()
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self.ui.callhook("Hook stdout: %s\nHook stderr:%s\n" % r)
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self.ui.callhook("Hook return code: %d" % p.returncode)
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except:
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self.ui.warn("Exception occured while calling hook")
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class SyncableAccount(Account, AccountSynchronizationMixin):
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pass
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def syncfolder(accountname, remoterepos, remotefolder, localrepos,
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statusrepos, quick):
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global mailboxes
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ui = UIBase.getglobalui()
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ui.registerthread(accountname)
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# Load local folder.
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localfolder = localrepos.\
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getfolder(remotefolder.getvisiblename().\
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replace(remoterepos.getsep(), localrepos.getsep()))
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# Write the mailboxes
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mbnames.add(accountname, localfolder.getvisiblename())
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# Load status folder.
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statusfolder = statusrepos.getfolder(remotefolder.getvisiblename().\
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replace(remoterepos.getsep(),
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statusrepos.getsep()))
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if localfolder.getuidvalidity() == None:
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# This is a new folder, so delete the status cache to be sure
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# we don't have a conflict.
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statusfolder.deletemessagelist()
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statusfolder.cachemessagelist()
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if quick:
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if not localfolder.quickchanged(statusfolder) \
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and not remotefolder.quickchanged(statusfolder):
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ui.skippingfolder(remotefolder)
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localrepos.restore_atime()
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return
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# Load local folder
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ui.syncingfolder(remoterepos, remotefolder, localrepos, localfolder)
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ui.loadmessagelist(localrepos, localfolder)
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localfolder.cachemessagelist()
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ui.messagelistloaded(localrepos, localfolder, len(localfolder.getmessagelist().keys()))
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# If either the local or the status folder has messages and there is a UID
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# validity problem, warn and abort. If there are no messages, UW IMAPd
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# loses UIDVALIDITY. But we don't really need it if both local folders are
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# empty. So, in that case, just save it off.
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if len(localfolder.getmessagelist()) or len(statusfolder.getmessagelist()):
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if not localfolder.isuidvalidityok():
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ui.validityproblem(localfolder)
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localrepos.restore_atime()
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return
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if not remotefolder.isuidvalidityok():
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ui.validityproblem(remotefolder)
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localrepos.restore_atime()
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return
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else:
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localfolder.saveuidvalidity()
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remotefolder.saveuidvalidity()
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# Load remote folder.
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ui.loadmessagelist(remoterepos, remotefolder)
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remotefolder.cachemessagelist()
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ui.messagelistloaded(remoterepos, remotefolder,
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len(remotefolder.getmessagelist().keys()))
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#
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if not statusfolder.isnewfolder():
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# Delete local copies of remote messages. This way,
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# if a message's flag is modified locally but it has been
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# deleted remotely, we'll delete it locally. Otherwise, we
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# try to modify a deleted message's flags! This step
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# need only be taken if a statusfolder is present; otherwise,
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# there is no action taken *to* the remote repository.
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remotefolder.syncmessagesto_delete(localfolder, [localfolder,
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statusfolder])
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ui.syncingmessages(localrepos, localfolder, remoterepos, remotefolder)
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localfolder.syncmessagesto(statusfolder, [remotefolder, statusfolder])
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# Synchronize remote changes.
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ui.syncingmessages(remoterepos, remotefolder, localrepos, localfolder)
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remotefolder.syncmessagesto(localfolder, [localfolder, statusfolder])
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# Make sure the status folder is up-to-date.
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ui.syncingmessages(localrepos, localfolder, statusrepos, statusfolder)
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localfolder.syncmessagesto(statusfolder)
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statusfolder.save()
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localrepos.restore_atime()
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