code.delx.au - offlineimap/blob - offlineimap/head/offlineimap/folder/LocalStatus.py

   1 # Local status cache virtual folder
   2 # Copyright (C) 2002 - 2003 John Goerzen
   3 # <jgoerzen@complete.org>
   4 #
   5 #    This program is free software; you can redistribute it and/or modify
   6 #    it under the terms of the GNU General Public License as published by
   7 #    the Free Software Foundation; either version 2 of the License, or
   8 #    (at your option) any later version.
   9 #
  10 #    This program is distributed in the hope that it will be useful,
  11 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 #    GNU General Public License for more details.
  14 #
  15 #    You should have received a copy of the GNU General Public License
  16 #    along with this program; if not, write to the Free Software
  17 #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18
  19 from Base import BaseFolder
  20 import os, threading
  21
  22 magicline = "OFFLINEIMAP LocalStatus CACHE DATA - DO NOT MODIFY - FORMAT 1"
  23
  24 class LocalStatusFolder(BaseFolder):
  25     def __init__(self, root, name, repository, accountname):
  26         self.name = name
  27         self.root = root
  28         self.sep = '.'
  29         self.filename = os.path.join(root, name)
  30         self.messagelist = None
  31         self.repository = repository
  32         self.savelock = threading.Lock()
  33         self.doautosave = 1
  34         self.accountname = accountname
  35
  36     def getaccountname(self):
  37         return self.accountname
  38
  39     def storesmessages(self):
  40         return 0
  41
  42     def isnewfolder(self):
  43         return not os.path.exists(self.filename)
  44
  45     def getname(self):
  46         return self.name
  47
  48     def getroot(self):
  49         return self.root
  50
  51     def getsep(self):
  52         return self.sep
  53
  54     def getfullname(self):
  55         return self.filename
  56
  57     def deletemessagelist(self):
  58         if not self.isnewfolder():
  59             os.unlink(self.filename)
  60
  61     def cachemessagelist(self):
  62         if self.isnewfolder():
  63             self.messagelist = {}
  64             return
  65         file = open(self.filename, "rt")
  66         self.messagelist = {}
  67         line = file.readline().strip()
  68         assert(line == magicline)
  69         for line in file.xreadlines():
  70             line = line.strip()
  71             uid, flags = line.split(':')
  72             uid = long(uid)
  73             flags = [x for x in flags]
  74             self.messagelist[uid] = {'uid': uid, 'flags': flags}
  75         file.close()
  76
  77     def autosave(self):
  78         if self.doautosave:
  79             self.save()
  80
  81     def save(self):
  82         self.savelock.acquire()
  83         try:
  84             file = open(self.filename + ".tmp", "wt")
  85             file.write(magicline + "\n")
  86             for msg in self.messagelist.values():
  87                 flags = msg['flags']
  88                 flags.sort()
  89                 flags = ''.join(flags)
  90                 file.write("%s:%s\n" % (msg['uid'], flags))
  91             file.close()
  92             os.rename(self.filename + ".tmp", self.filename)
  93         finally:
  94             self.savelock.release()
  95
  96     def getmessagelist(self):
  97         return self.messagelist
  98
  99     def savemessage(self, uid, content, flags):
 100         if uid < 0:
 101             # We cannot assign a uid.
 102             return uid
 103
 104         if uid in self.messagelist:     # already have it
 105             self.savemessageflags(uid, flags)
 106             return uid
 107
 108         self.messagelist[uid] = {'uid': uid, 'flags': flags}
 109         self.autosave()
 110         return uid
 111
 112     def getmessageflags(self, uid):
 113         return self.messagelist[uid]['flags']
 114
 115     def savemessageflags(self, uid, flags):
 116         self.messagelist[uid]['flags'] = flags
 117         self.autosave()
 118
 119     def deletemessage(self, uid):
 120         if not uid in self.messagelist:
 121             return
 122         del(self.messagelist[uid])
 123         self.autosave()