038a433f69
1. There is one database per folder and sqlite requires to serialize the
writings. Instead of locking at LocalStatusSQLiteFolder object level, introduce
a new DatabaseFileLock object which is shared across threads. This fixes the
concurrent writes issues that some users might experience by duplications or
flags restored to the previous state.
2. Close the database only when we are sure no other threads will use the
connection on a *per-file* basis. Previous fix 677afb8d8f is wrong
because the same lock is shared for all the databases.
Github-fix: https://github.com/OfflineIMAP/offlineimap/issues/350
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
600 lines
23 KiB
Python
600 lines
23 KiB
Python
# Copyright (C) 2003-2015 John Goerzen & contributors
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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 subprocess import Popen, PIPE
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from threading import Event
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import os
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import time
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from sys import exc_info
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import traceback
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from offlineimap import mbnames, CustomConfig, OfflineImapError
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from offlineimap import globals
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from offlineimap.repository import Repository
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from offlineimap.ui import getglobalui
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from offlineimap.threadutil import InstanceLimitedThread
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try:
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import fcntl
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except:
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pass # ok if this fails, we can do without
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# FIXME: spaghetti code alert!
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def getaccountlist(customconfig):
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# Account names in a list.
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return customconfig.getsectionlist('Account')
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# FIXME: spaghetti code alert!
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def AccountListGenerator(customconfig):
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"""Returns a list of instanciated Account class, one per account name."""
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return [Account(customconfig, accountname)
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for accountname in getaccountlist(customconfig)]
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# FIXME: spaghetti code alert!
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def AccountHashGenerator(customconfig):
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"""Returns a dict of instanciated Account class with the account name as
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key."""
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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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class Account(CustomConfig.ConfigHelperMixin):
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"""Represents an account (ie. 2 repositories) to sync.
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Most of the time you will actually want to use the derived
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:class:`accounts.SyncableAccount` which contains all functions used
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for syncing an account."""
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# Signal gets set when we should stop looping.
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abort_soon_signal = Event()
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# Signal gets set on CTRL-C/SIGTERM.
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abort_NOW_signal = Event()
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def __init__(self, config, name):
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"""
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:param config: Representing the offlineimap configuration file.
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:type config: :class:`offlineimap.CustomConfig.CustomConfigParser`
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:param name: A (str) string denoting the name of the Account
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as configured.
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"""
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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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# current :mod:`offlineimap.ui`, can be used for logging:
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self.ui = getglobalui()
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self.refreshperiod = self.getconffloat('autorefresh', 0.0)
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# should we run in "dry-run" mode?
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self.dryrun = self.config.getboolean('general', 'dry-run')
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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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# Interface from CustomConfig.ConfigHelperMixin
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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 __str__(self):
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return 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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# Interface from CustomConfig.ConfigHelperMixin
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def getsection(self):
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return 'Account ' + self.getname()
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@classmethod
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def set_abort_event(cls, config, signum):
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"""Set skip sleep/abort event for all accounts.
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If we want to skip a current (or the next) sleep, or if we want
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to abort an autorefresh loop, the main thread can use
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set_abort_event() to send the corresponding signal. Signum = 1
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implies that we want all accounts to abort or skip the current
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or next sleep phase. Signum = 2 will end the autorefresh loop,
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ie all accounts will return after they finished a sync. signum=3
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means, abort NOW, e.g. on SIGINT or SIGTERM.
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This is a class method, it will send the signal to all accounts.
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"""
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if signum == 1:
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# resync signal, set config option for all accounts
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for acctsection in getaccountlist(config):
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config.set('Account ' + acctsection, "skipsleep", '1')
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elif signum == 2:
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# don't autorefresh anymore
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cls.abort_soon_signal.set()
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elif signum == 3:
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# abort ASAP
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cls.abort_NOW_signal.set()
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def get_abort_event(self):
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"""Checks if an abort signal had been sent.
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If the 'skipsleep' config option for this account had been set,
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with `set_abort_event(config, 1)` it will get cleared in this
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function. Ie, we will only skip one sleep and not all.
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:returns: True, if the main thread had called
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:meth:`set_abort_event` earlier, otherwise 'False'.
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"""
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skipsleep = self.getconfboolean("skipsleep", 0)
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if skipsleep:
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self.config.set(self.getsection(), "skipsleep", '0')
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return skipsleep or Account.abort_soon_signal.is_set() or \
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Account.abort_NOW_signal.is_set()
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def _sleeper(self):
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"""Sleep if the account is set to autorefresh.
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:returns: 0:timeout expired, 1: canceled the timer,
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2:request to abort the program,
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100: if configured to not sleep at all.
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"""
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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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sleepresult = self.ui.sleep(refreshperiod, self)
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# Cancel keepalive
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for item in kaobjs:
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item.stopkeepalive()
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if sleepresult:
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if Account.abort_soon_signal.is_set() or \
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Account.abort_NOW_signal.is_set():
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return 2
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self.quicknum = 0
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return 1
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return 0
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def serverdiagnostics(self):
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"""Output diagnostics for all involved repositories."""
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remote_repo = Repository(self, 'remote')
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local_repo = Repository(self, 'local')
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#status_repo = Repository(self, 'status')
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self.ui.serverdiagnostics(remote_repo, 'Remote')
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self.ui.serverdiagnostics(local_repo, 'Local')
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#self.ui.serverdiagnostics(statusrepos, 'Status')
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class SyncableAccount(Account):
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"""A syncable email account connecting 2 repositories.
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Derives from :class:`accounts.Account` but contains the additional
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functions :meth:`syncrunner`, :meth:`sync`, :meth:`syncfolders`,
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used for syncing."""
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def __init__(self, *args, **kwargs):
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Account.__init__(self, *args, **kwargs)
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self._lockfd = None
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self._lockfilepath = os.path.join(
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self.config.getmetadatadir(), "%s.lock"% self)
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def __lock(self):
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"""Lock the account, throwing an exception if it is locked already."""
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self._lockfd = open(self._lockfilepath, 'w')
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try:
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fcntl.lockf(self._lockfd, fcntl.LOCK_EX|fcntl.LOCK_NB)
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except NameError:
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#fcntl not available (Windows), disable file locking... :(
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pass
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except IOError:
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self._lockfd.close()
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raise OfflineImapError("Could not lock account %s. Is another "
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"instance using this account?"% self,
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OfflineImapError.ERROR.REPO), None, exc_info()[2]
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def _unlock(self):
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"""Unlock the account, deleting the lock file"""
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#If we own the lock file, delete it
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if self._lockfd and not self._lockfd.closed:
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self._lockfd.close()
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try:
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os.unlink(self._lockfilepath)
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except OSError:
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pass # Failed to delete for some reason.
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def syncrunner(self):
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self.ui.registerthread(self)
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try:
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accountmetadata = self.getaccountmeta()
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if not os.path.exists(accountmetadata):
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os.mkdir(accountmetadata, 0o700)
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self.remoterepos = Repository(self, 'remote')
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self.localrepos = Repository(self, 'local')
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self.statusrepos = Repository(self, 'status')
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except OfflineImapError as e:
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self.ui.error(e, exc_info()[2])
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if e.severity >= OfflineImapError.ERROR.CRITICAL:
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raise
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return
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# Loop account sync if needed (bail out after 3 failures)
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looping = 3
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while looping:
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self.ui.acct(self)
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try:
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self.__lock()
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self.__sync()
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except (KeyboardInterrupt, SystemExit):
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raise
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except OfflineImapError as e:
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# Stop looping and bubble up Exception if needed.
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if e.severity >= OfflineImapError.ERROR.REPO:
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if looping:
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looping -= 1
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if e.severity >= OfflineImapError.ERROR.CRITICAL:
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raise
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self.ui.error(e, exc_info()[2])
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except Exception as e:
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self.ui.error(e, exc_info()[2], msg=
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"While attempting to sync account '%s'"% self)
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else:
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# after success sync, reset the looping counter to 3
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if self.refreshperiod:
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looping = 3
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finally:
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self.ui.acctdone(self)
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self._unlock()
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if looping and self._sleeper() >= 2:
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looping = 0
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def get_local_folder(self, remotefolder):
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"""Return the corresponding local folder for a given remotefolder."""
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return self.localrepos.getfolder(
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remotefolder.getvisiblename().
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replace(self.remoterepos.getsep(), self.localrepos.getsep()))
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def __sync(self):
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"""Synchronize the account once, then return.
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Assumes that `self.remoterepos`, `self.localrepos`, and
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`self.statusrepos` has already been populated, so it should only
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be called from the :meth:`syncrunner` function."""
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folderthreads = []
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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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# init repos with list of folders, so we have them (and the
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# folder delimiter etc)
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remoterepos.getfolders()
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localrepos.getfolders()
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remoterepos.sync_folder_structure(localrepos, statusrepos)
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# replicate the folderstructure between REMOTE to LOCAL
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if not localrepos.getconfboolean('readonly', False):
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self.ui.syncfolders(remoterepos, localrepos)
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# iterate through all folders on the remote repo and sync
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for remotefolder in remoterepos.getfolders():
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# check for CTRL-C or SIGTERM
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if Account.abort_NOW_signal.is_set(): break
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if not remotefolder.sync_this:
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self.ui.debug('', "Not syncing filtered folder '%s'"
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"[%s]"% (remotefolder, remoterepos))
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continue # Ignore filtered folder
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localfolder = self.get_local_folder(remotefolder)
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if not localfolder.sync_this:
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self.ui.debug('', "Not syncing filtered folder '%s'"
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"[%s]"% (localfolder, localfolder.repository))
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continue # Ignore filtered folder
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if not globals.options.singlethreading:
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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 %s [acc: %s]"% (remotefolder.getexplainedname(), self),
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args = (self, remotefolder, quick))
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thread.start()
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folderthreads.append(thread)
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else:
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syncfolder(self, remotefolder, quick)
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# wait for all threads to finish
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for thr in folderthreads:
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thr.join()
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# Write out mailbox names if required and not in dry-run mode
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if not self.dryrun:
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mbnames.write(False)
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localrepos.forgetfolders()
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remoterepos.forgetfolders()
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except:
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#error while syncing. Drop all connections that we have, they
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#might be bogus by now (e.g. after suspend)
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localrepos.dropconnections()
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remoterepos.dropconnections()
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raise
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else:
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# sync went fine. Hold or drop depending on config
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localrepos.holdordropconnections()
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remoterepos.holdordropconnections()
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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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# check for CTRL-C or SIGTERM and run postsynchook
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if Account.abort_NOW_signal.is_set():
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return
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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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if self.dryrun: # don't if we are in dry-run mode
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return
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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 (KeyboardInterrupt, SystemExit):
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raise
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except Exception as e:
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self.ui.error(e, exc_info()[2], msg="Calling hook")
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def syncfolder(account, remotefolder, quick):
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"""Synchronizes given remote folder for the specified account.
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Filtered folders on the remote side will not invoke this function. However,
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this might be called in a concurrently."""
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def check_uid_validity(localfolder, remotefolder, statusfolder):
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# If either the local or the status folder has messages and
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# there is a UID validity problem, warn and abort. If there are
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# no messages, UW IMAPd loses UIDVALIDITY. But we don't really
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# need it if both local folders are empty. So, in that case,
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# just save it off.
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if localfolder.getmessagecount() > 0 or statusfolder.getmessagecount() > 0:
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if not localfolder.check_uidvalidity():
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ui.validityproblem(localfolder)
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localfolder.repository.restore_atime()
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return
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if not remotefolder.check_uidvalidity():
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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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# Both folders empty, just save new UIDVALIDITY
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localfolder.save_uidvalidity()
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remotefolder.save_uidvalidity()
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def save_min_uid(folder, min_uid):
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uidfile = folder.get_min_uid_file()
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fd = open(uidfile, 'wt')
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fd.write(str(min_uid) + "\n")
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fd.close()
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def cachemessagelists_upto_date(localfolder, remotefolder, date):
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"""Returns messages with uid > min(uids of messages newer than date)."""
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localfolder.cachemessagelist(min_date=date)
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check_uid_validity(localfolder, remotefolder, statusfolder)
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# local messagelist had date restriction applied already. Restrict
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# sync to messages with UIDs >= min_uid from this list.
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#
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# local messagelist might contain new messages (with uid's < 0).
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positive_uids = filter(
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lambda uid: uid > 0, localfolder.getmessageuidlist())
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if len(positive_uids) > 0:
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remotefolder.cachemessagelist(min_uid=min(positive_uids))
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else:
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# No messages with UID > 0 in range in localfolder.
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# date restriction was applied with respect to local dates but
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# remote folder timezone might be different from local, so be
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# safe and make sure the range isn't bigger than in local.
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remotefolder.cachemessagelist(
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min_date=time.gmtime(time.mktime(date) + 24*60*60))
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def cachemessagelists_startdate(new, partial, date):
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"""Retrieve messagelists when startdate has been set for
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the folder 'partial'.
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Idea: suppose you want to clone the messages after date in one
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account (partial) to a new one (new). If new is empty, then copy
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messages in partial newer than date to new, and keep track of the
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min uid. On subsequent syncs, sync all the messages in new against
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those after that min uid in partial. This is a partial replacement
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for maxage in the IMAP-IMAP sync case, where maxage doesn't work:
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the UIDs of the messages in localfolder might not be in the same
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order as those of corresponding messages in remotefolder, so if L in
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local corresponds to R in remote, the ranges [L, ...] and [R, ...]
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might not correspond. But, if we're cloning a folder into a new one,
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[min_uid, ...] does correspond to [1, ...].
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This is just for IMAP-IMAP. For Maildir-IMAP, use maxage instead."""
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new.cachemessagelist()
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min_uid = partial.retrieve_min_uid()
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if min_uid == None: # min_uid file didn't exist
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if len(new.getmessageuidlist()) > 0:
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raise OfflineImapError("To use startdate on Repository %s, "
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"Repository %s must be empty"%
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(partial.repository.name, new.repository.name),
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OfflineImapError.ERROR.MESSAGE)
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else:
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partial.cachemessagelist(min_date=date)
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# messagelist.keys() instead of getuidmessagelist() because in
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# the UID mapped case we want the actual local UIDs, not their
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# remote counterparts
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positive_uids = filter(
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lambda uid: uid > 0, partial.messagelist.keys())
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if len(positive_uids) > 0:
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min_uid = min(positive_uids)
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else:
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min_uid = 1
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save_min_uid(partial, min_uid)
|
|
else:
|
|
partial.cachemessagelist(min_uid=min_uid)
|
|
|
|
|
|
remoterepos = account.remoterepos
|
|
localrepos = account.localrepos
|
|
statusrepos = account.statusrepos
|
|
|
|
ui = getglobalui()
|
|
ui.registerthread(account)
|
|
try:
|
|
# Load local folder.
|
|
localfolder = account.get_local_folder(remotefolder)
|
|
|
|
# Write the mailboxes
|
|
mbnames.add(account.name, localfolder.getname(),
|
|
localrepos.getlocalroot())
|
|
|
|
# Load status folder.
|
|
statusfolder = statusrepos.getfolder(remotefolder.getvisiblename().
|
|
replace(remoterepos.getsep(), statusrepos.getsep()))
|
|
statusfolder.openfiles()
|
|
|
|
if localfolder.get_uidvalidity() == None:
|
|
# This is a new folder, so delete the status cache to be
|
|
# sure we don't have a conflict.
|
|
# TODO: This does not work. We always return a value, need
|
|
# to rework this...
|
|
statusfolder.deletemessagelist()
|
|
|
|
statusfolder.cachemessagelist()
|
|
|
|
|
|
# Load local folder.
|
|
ui.syncingfolder(remoterepos, remotefolder, localrepos, localfolder)
|
|
|
|
# Retrieve messagelists, taking into account age-restriction
|
|
# options
|
|
maxage = localfolder.getmaxage()
|
|
localstart = localfolder.getstartdate()
|
|
remotestart = remotefolder.getstartdate()
|
|
if (maxage != None) + (localstart != None) + (remotestart != None) > 1:
|
|
raise OfflineImapError("You can set at most one of the "
|
|
"following: maxage, startdate (for the local folder), "
|
|
"startdate (for the remote folder)",
|
|
OfflineImapError.ERROR.REPO), None, exc_info()[2]
|
|
if (maxage != None or localstart or remotestart) and quick:
|
|
# IMAP quickchanged isn't compatible with options that
|
|
# involve restricting the messagelist, since the "quick"
|
|
# check can only retrieve a full list of UIDs in the folder.
|
|
ui.warn("Quick syncs (-q) not supported in conjunction "
|
|
"with maxage or startdate; ignoring -q.")
|
|
if maxage != None:
|
|
cachemessagelists_upto_date(localfolder, remotefolder, maxage)
|
|
elif localstart != None:
|
|
cachemessagelists_startdate(remotefolder, localfolder,
|
|
localstart)
|
|
check_uid_validity(localfolder, remotefolder, statusfolder)
|
|
elif remotestart != None:
|
|
cachemessagelists_startdate(localfolder, remotefolder,
|
|
remotestart)
|
|
check_uid_validity(localfolder, remotefolder, statusfolder)
|
|
else:
|
|
localfolder.cachemessagelist()
|
|
if quick:
|
|
if (not localfolder.quickchanged(statusfolder) and
|
|
not remotefolder.quickchanged(statusfolder)):
|
|
ui.skippingfolder(remotefolder)
|
|
localrepos.restore_atime()
|
|
return
|
|
check_uid_validity(localfolder, remotefolder, statusfolder)
|
|
remotefolder.cachemessagelist()
|
|
|
|
# Synchronize remote changes.
|
|
if not localrepos.getconfboolean('readonly', False):
|
|
ui.syncingmessages(remoterepos, remotefolder, localrepos, localfolder)
|
|
remotefolder.syncmessagesto(localfolder, statusfolder)
|
|
else:
|
|
ui.debug('imap', "Not syncing to read-only repository '%s'" \
|
|
% localrepos.getname())
|
|
|
|
# Synchronize local changes
|
|
if not remoterepos.getconfboolean('readonly', False):
|
|
ui.syncingmessages(localrepos, localfolder, remoterepos, remotefolder)
|
|
localfolder.syncmessagesto(remotefolder, statusfolder)
|
|
else:
|
|
ui.debug('', "Not syncing to read-only repository '%s'" \
|
|
% remoterepos.getname())
|
|
|
|
statusfolder.save()
|
|
localrepos.restore_atime()
|
|
except (KeyboardInterrupt, SystemExit):
|
|
raise
|
|
except OfflineImapError as e:
|
|
# bubble up severe Errors, skip folder otherwise
|
|
if e.severity > OfflineImapError.ERROR.FOLDER:
|
|
raise
|
|
else:
|
|
ui.error(e, exc_info()[2], msg="Aborting sync, folder '%s' "
|
|
"[acc: '%s']"% (localfolder, account))
|
|
except Exception as e:
|
|
ui.error(e, msg = "ERROR in syncfolder for %s folder %s: %s"%
|
|
(account, remotefolder.getvisiblename(), traceback.format_exc()))
|
|
finally:
|
|
for folder in ["statusfolder", "localfolder", "remotefolder"]:
|
|
if folder in locals():
|
|
locals()[folder].dropmessagelistcache()
|
|
statusfolder.closefiles()
|