c1c200a487
We use getfullname() very often (thousands to millions), yet we dynamically calculate the very same value over and over. Optimize this by caching the value once and be done with it. Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de> Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
322 lines
12 KiB
Python
322 lines
12 KiB
Python
# Maildir folder support
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# Copyright (C) 2002 - 2007 John Goerzen
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# <jgoerzen@complete.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import socket
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import time
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import re
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import os
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from Base import BaseFolder
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from threading import Lock
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try:
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from hashlib import md5
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except ImportError:
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from md5 import md5
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uidmatchre = re.compile(',U=(\d+)')
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flagmatchre = re.compile(':.*2,([A-Z]+)')
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timestampmatchre = re.compile('(\d+)');
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timeseq = 0
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lasttime = long(0)
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timelock = Lock()
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def gettimeseq():
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global lasttime, timeseq, timelock
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timelock.acquire()
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try:
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thistime = long(time.time())
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if thistime == lasttime:
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timeseq += 1
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return (thistime, timeseq)
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else:
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lasttime = thistime
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timeseq = 0
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return (thistime, timeseq)
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finally:
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timelock.release()
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class MaildirFolder(BaseFolder):
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def __init__(self, root, name, sep, repository, accountname, config):
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self.name = name
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self.config = config
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self.dofsync = config.getdefaultboolean("general", "fsync", True)
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self.root = root
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self.sep = sep
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self.messagelist = None
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self.repository = repository
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self.accountname = accountname
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BaseFolder.__init__(self)
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#self.ui is set in BaseFolder.init()
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# Cache the full folder path, as we use getfullname() very often
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self._fullname = os.path.join(self.getroot(), self.getname())
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def getaccountname(self):
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return self.accountname
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def getfullname(self):
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"""Return the absolute file path to the Maildir folder (sans cur|new)"""
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return self._fullname
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def getuidvalidity(self):
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"""Maildirs have no notion of uidvalidity, so we just return a magic
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token."""
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return 42
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#Checks to see if the given message is within the maximum age according
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#to the maildir name which should begin with a timestamp
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def _iswithinmaxage(self, messagename, maxage):
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#In order to have the same behaviour as SINCE in an IMAP search
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#we must convert this to the oldest time and then strip off hrs/mins
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#from that day
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oldest_time_utc = time.time() - (60*60*24*maxage)
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oldest_time_struct = time.gmtime(oldest_time_utc)
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oldest_time_today_seconds = ((oldest_time_struct[3] * 3600) \
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+ (oldest_time_struct[4] * 60) \
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+ oldest_time_struct[5])
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oldest_time_utc -= oldest_time_today_seconds
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timestampmatch = timestampmatchre.search(messagename)
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timestampstr = timestampmatch.group()
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timestamplong = long(timestampstr)
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if(timestamplong < oldest_time_utc):
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return False
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else:
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return True
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def _scanfolder(self):
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"""Cache the message list. Maildir flags are:
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R (replied)
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S (seen)
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T (trashed)
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D (draft)
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F (flagged)
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and must occur in ASCII order."""
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retval = {}
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files = []
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nouidcounter = -1 # Messages without UIDs get
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# negative UID numbers.
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foldermd5 = md5(self.getvisiblename()).hexdigest()
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folderstr = ',FMD5=' + foldermd5
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for dirannex in ['new', 'cur']:
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fulldirname = os.path.join(self.getfullname(), dirannex)
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files.extend(os.path.join(fulldirname, filename) for
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filename in os.listdir(fulldirname))
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for file in files:
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messagename = os.path.basename(file)
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#check if there is a parameter for maxage / maxsize - then see if this
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#message should be considered or not
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maxage = self.config.getdefaultint("Account " + self.accountname, "maxage", -1)
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maxsize = self.config.getdefaultint("Account " + self.accountname, "maxsize", -1)
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if(maxage != -1):
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isnewenough = self._iswithinmaxage(messagename, maxage)
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if(isnewenough != True):
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#this message is older than we should consider....
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continue
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#Check and see if the message is too big if the maxsize for this account is set
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if(maxsize != -1):
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filesize = os.path.getsize(file)
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if(filesize > maxsize):
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continue
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foldermatch = messagename.find(folderstr) != -1
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if not foldermatch:
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# If there is no folder MD5 specified, or if it mismatches,
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# assume it is a foreign (new) message and generate a
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# negative uid for it
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uid = nouidcounter
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nouidcounter -= 1
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else: # It comes from our folder.
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uidmatch = uidmatchre.search(messagename)
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uid = None
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if not uidmatch:
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uid = nouidcounter
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nouidcounter -= 1
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else:
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uid = long(uidmatch.group(1))
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flagmatch = flagmatchre.search(messagename)
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flags = []
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if flagmatch:
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flags = [x for x in flagmatch.group(1)]
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flags.sort()
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retval[uid] = {'uid': uid,
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'flags': flags,
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'filename': file}
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return retval
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def quickchanged(self, statusfolder):
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"""Returns True if the Maildir has changed"""
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self.cachemessagelist()
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# Folder has different uids than statusfolder => TRUE
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if sorted(self.getmessageuidlist()) != \
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sorted(statusfolder.getmessageuidlist()):
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return True
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# Also check for flag changes, it's quick on a Maildir
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for (uid, message) in self.getmessagelist().iteritems():
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if message['flags'] != statusfolder.getmessageflags(uid):
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return True
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return False #Nope, nothing changed
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def cachemessagelist(self):
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if self.messagelist is None:
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self.messagelist = self._scanfolder()
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def getmessagelist(self):
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return self.messagelist
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def getmessage(self, uid):
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filename = self.messagelist[uid]['filename']
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file = open(filename, 'rt')
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retval = file.read()
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file.close()
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return retval.replace("\r\n", "\n")
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def getmessagetime( self, uid ):
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filename = self.messagelist[uid]['filename']
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st = os.stat(filename)
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return st.st_mtime
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def savemessage(self, uid, content, flags, rtime):
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# This function only ever saves to tmp/,
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# but it calls savemessageflags() to actually save to cur/ or new/.
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self.ui.debug('maildir', 'savemessage: called to write with flags %s and content %s' % \
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(repr(flags), repr(content)))
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if uid < 0:
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# We cannot assign a new uid.
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return uid
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if uid in self.messagelist:
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# We already have it.
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self.savemessageflags(uid, flags)
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return uid
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# Otherwise, save the message in tmp/ and then call savemessageflags()
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# to give it a permanent home.
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tmpdir = os.path.join(self.getfullname(), 'tmp')
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messagename = None
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attempts = 0
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while 1:
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if attempts > 15:
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raise IOError, "Couldn't write to file %s" % messagename
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timeval, timeseq = gettimeseq()
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messagename = '%d_%d.%d.%s,U=%d,FMD5=%s' % \
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(timeval,
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timeseq,
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os.getpid(),
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socket.gethostname(),
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uid,
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md5(self.getvisiblename()).hexdigest())
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if os.path.exists(os.path.join(tmpdir, messagename)):
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time.sleep(2)
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attempts += 1
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else:
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break
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tmpmessagename = messagename.split(',')[0]
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self.ui.debug('maildir', 'savemessage: using temporary name %s' % tmpmessagename)
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file = open(os.path.join(tmpdir, tmpmessagename), "wt")
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file.write(content)
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# Make sure the data hits the disk
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file.flush()
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if self.dofsync:
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os.fsync(file.fileno())
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file.close()
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if rtime != None:
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os.utime(os.path.join(tmpdir,tmpmessagename), (rtime,rtime))
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self.ui.debug('maildir', 'savemessage: moving from %s to %s' % \
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(tmpmessagename, messagename))
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if tmpmessagename != messagename: # then rename it
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os.rename(os.path.join(tmpdir, tmpmessagename),
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os.path.join(tmpdir, messagename))
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if self.dofsync:
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try:
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# fsync the directory (safer semantics in Linux)
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fd = os.open(tmpdir, os.O_RDONLY)
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os.fsync(fd)
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os.close(fd)
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except:
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pass
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self.messagelist[uid] = {'uid': uid, 'flags': [],
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'filename': os.path.join(tmpdir, messagename)}
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self.savemessageflags(uid, flags)
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self.ui.debug('maildir', 'savemessage: returning uid %d' % uid)
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return uid
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def getmessageflags(self, uid):
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return self.messagelist[uid]['flags']
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def savemessageflags(self, uid, flags):
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oldfilename = self.messagelist[uid]['filename']
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newpath, newname = os.path.split(oldfilename)
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tmpdir = os.path.join(self.getfullname(), 'tmp')
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if 'S' in flags:
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# If a message has been seen, it goes into the cur
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# directory. CR debian#152482, [complete.org #4]
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newpath = os.path.join(self.getfullname(), 'cur')
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else:
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newpath = os.path.join(self.getfullname(), 'new')
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infostr = ':'
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infomatch = re.search('(:.*)$', newname)
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if infomatch: # If the info string is present..
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infostr = infomatch.group(1)
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newname = newname.split(':')[0] # Strip off the info string.
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infostr = re.sub('2,[A-Z]*', '', infostr)
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flags.sort()
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infostr += '2,' + ''.join(flags)
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newname += infostr
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newfilename = os.path.join(newpath, newname)
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if (newfilename != oldfilename):
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os.rename(oldfilename, newfilename)
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self.messagelist[uid]['flags'] = flags
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self.messagelist[uid]['filename'] = newfilename
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# By now, the message had better not be in tmp/ land!
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final_dir, final_name = os.path.split(self.messagelist[uid]['filename'])
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assert final_dir != tmpdir
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def deletemessage(self, uid):
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"""Unlinks a message file from the Maildir.
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:param uid: UID of a mail message
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:type uid: String
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:return: Nothing, or an Exception if UID but no corresponding file
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found.
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"""
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if not self.uidexists(uid):
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return
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filename = self.messagelist[uid]['filename']
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try:
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os.unlink(filename)
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except OSError:
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# Can't find the file -- maybe already deleted?
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newmsglist = self._scanfolder()
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if uid in newmsglist: # Nope, try new filename.
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os.unlink(newmsglist[uid]['filename'])
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# Yep -- return.
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del(self.messagelist[uid])
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