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docker-offlineimap/offlineimap/accounts.py
Sebastian Spaeth 383ae9e647 Catch SystemExit and KeyboardInterrupt exceptions 
Previously we did not catch KeyboardInterrupts explicitly as all of the
code was executed in forked child threads which would never receive
Ctrl-c exceptions. With the upcoming single threaded modus, this code
can be run in the main thread however, so we need to take care of
KeyboardInterrupts explicitly. As this is pretty highlevel code, we also
protect against receiving a SystemExit exception which is raised e.g. in
the ui.terminate() code by calling sys.exit().

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
2011-01-14 19:25:11 +01:00

382 lines
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Python
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# Copyright (C) 2003 John Goerzen
# <jgoerzen@complete.org>
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
from offlineimap import threadutil, mbnames, CustomConfig
import offlineimap.repository.Base, offlineimap.repository.LocalStatus
from offlineimap.ui import getglobalui
from offlineimap.threadutil import InstanceLimitedThread, ExitNotifyThread
from subprocess import Popen, PIPE
from threading import Event, Lock
import os
from Queue import Queue, Empty
import sys
class SigListener(Queue):
def __init__(self):
self.folderlock = Lock()
self.folders = None
Queue.__init__(self, 20)
def put_nowait(self, sig):
self.folderlock.acquire()
try:
if sig == 1:
if self.folders is None or not self.autorefreshes:
# folders haven't yet been added, or this account is once-only; drop signal
return
elif self.folders:
for foldernr in range(len(self.folders)):
# requeue folder
self.folders[foldernr][1] = True
self.quick = False
return
# else folders have already been cleared, put signal...
finally:
self.folderlock.release()
Queue.put_nowait(self, sig)
def addfolders(self, remotefolders, autorefreshes, quick):
self.folderlock.acquire()
try:
self.folders = []
self.quick = quick
self.autorefreshes = autorefreshes
for folder in remotefolders:
# new folders are queued
self.folders.append([folder, True])
finally:
self.folderlock.release()
def clearfolders(self):
self.folderlock.acquire()
try:
for folder, queued in self.folders:
if queued:
# some folders still in queue
return False
self.folders[:] = []
return True
finally:
self.folderlock.release()
def queuedfolders(self):
self.folderlock.acquire()
try:
dirty = True
while dirty:
dirty = False
for foldernr, (folder, queued) in enumerate(self.folders):
if queued:
# mark folder as no longer queued
self.folders[foldernr][1] = False
dirty = True
quick = self.quick
self.folderlock.release()
yield (folder, quick)
self.folderlock.acquire()
except:
self.folderlock.release()
raise
self.folderlock.release()
def getaccountlist(customconfig):
return customconfig.getsectionlist('Account')
def AccountListGenerator(customconfig):
return [Account(customconfig, accountname)
for accountname in getaccountlist(customconfig)]
def AccountHashGenerator(customconfig):
retval = {}
for item in AccountListGenerator(customconfig):
retval[item.getname()] = item
return retval
mailboxes = []
class Account(CustomConfig.ConfigHelperMixin):
def __init__(self, config, name):
self.config = config
self.name = name
self.metadatadir = config.getmetadatadir()
self.localeval = config.getlocaleval()
self.ui = getglobalui()
self.refreshperiod = self.getconffloat('autorefresh', 0.0)
self.quicknum = 0
if self.refreshperiod == 0.0:
self.refreshperiod = None
def getlocaleval(self):
return self.localeval
def getconfig(self):
return self.config
def getname(self):
return self.name
def getsection(self):
return 'Account ' + self.getname()
def sleeper(self, siglistener):
"""Sleep handler. Returns same value as UIBase.sleep:
0 if timeout expired, 1 if there was a request to cancel the timer,
and 2 if there is a request to abort the program.
Also, returns 100 if configured to not sleep at all."""
if not self.refreshperiod:
return 100
kaobjs = []
if hasattr(self, 'localrepos'):
kaobjs.append(self.localrepos)
if hasattr(self, 'remoterepos'):
kaobjs.append(self.remoterepos)
for item in kaobjs:
item.startkeepalive()
refreshperiod = int(self.refreshperiod * 60)
# try:
# sleepresult = siglistener.get_nowait()
# # retrieved signal before sleep started
# if sleepresult == 1:
# # catching signal 1 here means folders were cleared before signal was posted
# pass
# except Empty:
# sleepresult = self.ui.sleep(refreshperiod, siglistener)
sleepresult = self.ui.sleep(refreshperiod, siglistener)
if sleepresult == 1:
self.quicknum = 0
# Cancel keepalive
for item in kaobjs:
item.stopkeepalive()
return sleepresult
class AccountSynchronizationMixin:
def syncrunner(self, siglistener):
self.ui.registerthread(self.name)
self.ui.acct(self.name)
accountmetadata = self.getaccountmeta()
if not os.path.exists(accountmetadata):
os.mkdir(accountmetadata, 0700)
self.remoterepos = offlineimap.repository.Base.LoadRepository(self.getconf('remoterepository'), self, 'remote')
# Connect to the local repository.
self.localrepos = offlineimap.repository.Base.LoadRepository(self.getconf('localrepository'), self, 'local')
# Connect to the local cache.
self.statusrepos = offlineimap.repository.LocalStatus.LocalStatusRepository(self.getconf('localrepository'), self)
#might need changes here to ensure that one account sync does not crash others...
if not self.refreshperiod:
try:
try:
self.sync(siglistener)
except (KeyboardInterrupt, SystemExit):
raise
except:
self.ui.warn("Error occured attempting to sync account " + self.name \
+ ": " + str(sys.exc_info()[1]))
finally:
self.ui.acctdone(self.name)
return
looping = 1
while looping:
try:
try:
self.sync(siglistener)
except (KeyboardInterrupt, SystemExit):
raise
except:
self.ui.warn("Error occured attempting to sync account " + self.name \
+ ": " + str(sys.exc_info()[1]))
finally:
looping = self.sleeper(siglistener) != 2
self.ui.acctdone(self.name)
def getaccountmeta(self):
return os.path.join(self.metadatadir, 'Account-' + self.name)
def sync(self, siglistener):
# We don't need an account lock because syncitall() goes through
# each account once, then waits for all to finish.
hook = self.getconf('presynchook', '')
self.callhook(hook)
quickconfig = self.getconfint('quick', 0)
if quickconfig < 0:
quick = True
elif quickconfig > 0:
if self.quicknum == 0 or self.quicknum > quickconfig:
self.quicknum = 1
quick = False
else:
self.quicknum = self.quicknum + 1
quick = True
else:
quick = False
try:
remoterepos = self.remoterepos
localrepos = self.localrepos
statusrepos = self.statusrepos
self.ui.syncfolders(remoterepos, localrepos)
remoterepos.syncfoldersto(localrepos, [statusrepos])
siglistener.addfolders(remoterepos.getfolders(), bool(self.refreshperiod), quick)
while True:
folderthreads = []
for remotefolder, quick in siglistener.queuedfolders():
thread = InstanceLimitedThread(\
instancename = 'FOLDER_' + self.remoterepos.getname(),
target = syncfolder,
name = "Folder sync %s[%s]" % \
(self.name, remotefolder.getvisiblename()),
args = (self.name, remoterepos, remotefolder, localrepos,
statusrepos, quick))
thread.setDaemon(1)
thread.start()
folderthreads.append(thread)
threadutil.threadsreset(folderthreads)
if siglistener.clearfolders():
break
mbnames.write()
localrepos.forgetfolders()
remoterepos.forgetfolders()
localrepos.holdordropconnections()
remoterepos.holdordropconnections()
finally:
pass
hook = self.getconf('postsynchook', '')
self.callhook(hook)
def callhook(self, cmd):
if not cmd:
return
try:
self.ui.callhook("Calling hook: " + cmd)
p = Popen(cmd, shell=True,
stdin=PIPE, stdout=PIPE, stderr=PIPE,
close_fds=True)
r = p.communicate()
self.ui.callhook("Hook stdout: %s\nHook stderr:%s\n" % r)
self.ui.callhook("Hook return code: %d" % p.returncode)
except:
self.ui.warn("Exception occured while calling hook")
class SyncableAccount(Account, AccountSynchronizationMixin):
pass
def syncfolder(accountname, remoterepos, remotefolder, localrepos,
statusrepos, quick):
global mailboxes
ui = getglobalui()
ui.registerthread(accountname)
try:
# Load local folder.
localfolder = localrepos.\
getfolder(remotefolder.getvisiblename().\
replace(remoterepos.getsep(), localrepos.getsep()))
# Write the mailboxes
mbnames.add(accountname, localfolder.getvisiblename())
# Load status folder.
statusfolder = statusrepos.getfolder(remotefolder.getvisiblename().\
replace(remoterepos.getsep(),
statusrepos.getsep()))
if localfolder.getuidvalidity() == None:
# This is a new folder, so delete the status cache to be sure
# we don't have a conflict.
statusfolder.deletemessagelist()
statusfolder.cachemessagelist()
if quick:
if not localfolder.quickchanged(statusfolder) \
and not remotefolder.quickchanged(statusfolder):
ui.skippingfolder(remotefolder)
localrepos.restore_atime()
return
# Load local folder
ui.syncingfolder(remoterepos, remotefolder, localrepos, localfolder)
ui.loadmessagelist(localrepos, localfolder)
localfolder.cachemessagelist()
ui.messagelistloaded(localrepos, localfolder, len(localfolder.getmessagelist().keys()))
# If either the local or the status folder has messages and there is a UID
# validity problem, warn and abort. If there are no messages, UW IMAPd
# loses UIDVALIDITY. But we don't really need it if both local folders are
# empty. So, in that case, just save it off.
if len(localfolder.getmessagelist()) or len(statusfolder.getmessagelist()):
if not localfolder.isuidvalidityok():
ui.validityproblem(localfolder)
localrepos.restore_atime()
return
if not remotefolder.isuidvalidityok():
ui.validityproblem(remotefolder)
localrepos.restore_atime()
return
else:
localfolder.saveuidvalidity()
remotefolder.saveuidvalidity()
# Load remote folder.
ui.loadmessagelist(remoterepos, remotefolder)
remotefolder.cachemessagelist()
ui.messagelistloaded(remoterepos, remotefolder,
len(remotefolder.getmessagelist().keys()))
#
if not statusfolder.isnewfolder():
# Delete local copies of remote messages. This way,
# if a message's flag is modified locally but it has been
# deleted remotely, we'll delete it locally. Otherwise, we
# try to modify a deleted message's flags! This step
# need only be taken if a statusfolder is present; otherwise,
# there is no action taken *to* the remote repository.
remotefolder.syncmessagesto_delete(localfolder, [localfolder,
statusfolder])
ui.syncingmessages(localrepos, localfolder, remoterepos, remotefolder)
localfolder.syncmessagesto(statusfolder, [remotefolder, statusfolder])
# Synchronize remote changes.
ui.syncingmessages(remoterepos, remotefolder, localrepos, localfolder)
remotefolder.syncmessagesto(localfolder, [localfolder, statusfolder])
# Make sure the status folder is up-to-date.
ui.syncingmessages(localrepos, localfolder, statusrepos, statusfolder)
localfolder.syncmessagesto(statusfolder)
statusfolder.save()
localrepos.restore_atime()
except (KeyboardInterrupt, SystemExit):
raise
except:
ui.warn("ERROR in syncfolder for %s folder %s: %s" % \
(accountname,remotefolder.getvisiblename(),sys.exc_info()[1]))
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