# Copyright (C) 1998,1999,2000,2001,2002 by the Free Software Foundation, Inc.
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# site modules
#
import os
import marshal
import time
import errno
#
# package/project modules
#
import pipermail
from Mailman import LockFile
CACHESIZE = pipermail.CACHESIZE
try:
import cPickle
pickle = cPickle
except ImportError:
import pickle
#
# we're using a python dict in place of
# of bsddb.btree database. only defining
# the parts of the interface used by class HyperDatabase
# only one thing can access this at a time.
#
class DumbBTree:
"""Stores pickles of Article objects
This dictionary-like object stores pickles of all the Article
objects. The object itself is stored using marshal. It would be
much simpler, and probably faster, to store the actual objects in
the DumbBTree and pickle it.
TBD: Also needs a more sensible name, like IteratableDictionary or
SortedDictionary.
"""
def __init__(self, path):
self.current_index = 0
self.path = path
self.lockfile = LockFile.LockFile(self.path + ".lock")
self.lock()
self.__dirty = 0
self.dict = {}
self.sorted = []
self.load()
def __repr__(self):
return "DumbBTree(%s)" % self.path
def __sort(self, dirty=None):
if self.__dirty == 1 or dirty:
self.sorted = self.dict.keys()
self.sorted.sort()
self.__dirty = 0
def lock(self):
self.lockfile.lock()
def unlock(self):
try:
self.lockfile.unlock()
except LockFile.NotLockedError:
pass
def __delitem__(self, item):
# if first hasn't been called, we can skip the sort
if self.current_index == 0:
del self.dict[item]
self.__dirty = 1
return
try:
ci = self.sorted[self.current_index]
except IndexError:
ci = None
if ci == item:
try:
ci = self.sorted[self.current_index + 1]
except IndexError:
ci = None
del self.dict[item]
self.__sort(dirty=1)
if ci is not None:
self.current_index = self.sorted.index(ci)
else:
self.current_index = self.current_index + 1
def clear(self):
# bulk clearing much faster than deleting each item, esp. with the
# implementation of __delitem__() above :(
self.dict = {}
def first(self):
self.__sort() # guarantee that the list is sorted
if not self.sorted:
raise KeyError
else:
key = self.sorted[0]
self.current_index = 1
return key, self.dict[key]
def last(self):
if not self.sorted:
raise KeyError
else:
key = self.sorted[-1]
self.current_index = len(self.sorted) - 1
return key, self.dict[key]
def next(self):
try:
key = self.sorted[self.current_index]
except IndexError:
raise KeyError
self.current_index = self.current_index + 1
return key, self.dict[key]
def has_key(self, key):
return self.dict.has_key(key)
def set_location(self, loc):
if not self.dict.has_key(loc):
raise KeyError
self.current_index = self.sorted.index(loc)
def __getitem__(self, item):
return self.dict[item]
def __setitem__(self, item, val):
# if first hasn't been called, then we don't need to worry
# about sorting again
if self.current_index == 0:
self.dict[item] = val
self.__dirty = 1
return
try:
current_item = self.sorted[self.current_index]
except IndexError:
current_item = item
self.dict[item] = val
self.__sort(dirty=1)
self.current_index = self.sorted.index(current_item)
def __len__(self):
return len(self.sorted)
def load(self):
try:
fp = open(self.path)
try:
self.dict = marshal.load(fp)
finally:
fp.close()
except IOError, e:
if e.errno <> errno.ENOENT: raise
pass
except EOFError:
pass
else:
self.__sort(dirty=1)
def close(self):
omask = os.umask(007)
try:
fp = open(self.path, 'w')
finally:
os.umask(omask)
fp.write(marshal.dumps(self.dict))
fp.close()
self.unlock()
# this is lifted straight out of pipermail with
# the bsddb.btree replaced with above class.
# didn't use inheritance because of all the
# __internal stuff that needs to be here -scott
#
class HyperDatabase(pipermail.Database):
__super_addArticle = pipermail.Database.addArticle
def __init__(self, basedir, mlist):
self.__cache = {}
self.__currentOpenArchive = None # The currently open indices
self._mlist = mlist
self.basedir = os.path.expanduser(basedir)
# Recently added articles, indexed only by message ID
self.changed={}
def firstdate(self, archive):
self.__openIndices(archive)
date = 'None'
try:
datekey, msgid = self.dateIndex.first()
date = time.asctime(time.localtime(float(datekey[0])))
except KeyError:
pass
return date
def lastdate(self, archive):
self.__openIndices(archive)
date = 'None'
try:
datekey, msgid = self.dateIndex.last()
date = time.asctime(time.localtime(float(datekey[0])))
except KeyError:
pass
return date
def numArticles(self, archive):
self.__openIndices(archive)
return len(self.dateIndex)
def addArticle(self, archive, article, subject=None, author=None,
date=None):
self.__openIndices(archive)
self.__super_addArticle(archive, article, subject, author, date)
def __openIndices(self, archive):
if self.__currentOpenArchive == archive:
return
self.__closeIndices()
arcdir = os.path.join(self.basedir, 'database')
omask = os.umask(0)
try:
try:
os.mkdir(arcdir, 02770)
except OSError, e:
if e.errno <> errno.EEXIST: raise
finally:
os.umask(omask)
for i in ('date', 'author', 'subject', 'article', 'thread'):
t = DumbBTree(os.path.join(arcdir, archive + '-' + i))
setattr(self, i + 'Index', t)
self.__currentOpenArchive = archive
def __closeIndices(self):
for i in ('date', 'author', 'subject', 'thread', 'article'):
attr = i + 'Index'
if hasattr(self, attr):
index = getattr(self, attr)
if i == 'article':
if not hasattr(self, 'archive_length'):
self.archive_length = {}
l = len(index)
self.archive_length[self.__currentOpenArchive] = l
index.close()
delattr(self, attr)
self.__currentOpenArchive = None
def close(self):
self.__closeIndices()
def hasArticle(self, archive, msgid):
self.__openIndices(archive)
return self.articleIndex.has_key(msgid)
def setThreadKey(self, archive, key, msgid):
self.__openIndices(archive)
self.threadIndex[key]=msgid
def getArticle(self, archive, msgid):
self.__openIndices(archive)
if not self.__cache.has_key(msgid):
# get the pickled object out of the DumbBTree
buf = self.articleIndex[msgid]
article = self.__cache[msgid] = pickle.loads(buf)
# For upgrading older archives
article.setListIfUnset(self._mlist)
else:
article = self.__cache[msgid]
return article
def first(self, archive, index):
self.__openIndices(archive)
index = getattr(self, index + 'Index')
try:
key, msgid = index.first()
return msgid
except KeyError:
return None
def next(self, archive, index):
self.__openIndices(archive)
index = getattr(self, index + 'Index')
try:
key, msgid = index.next()
return msgid
except KeyError:
return None
def getOldestArticle(self, archive, subject):
self.__openIndices(archive)
subject = subject.lower()
try:
key, tempid=self.subjectIndex.set_location(subject)
self.subjectIndex.next()
[subject2, date]= key.split('\0')
if subject!=subject2: return None
return tempid
except KeyError:
return None
def newArchive(self, archive):
pass
def clearIndex(self, archive, index):
self.__openIndices(archive)
if hasattr(self.threadIndex, 'clear'):
self.threadIndex.clear()
return
finished=0
try:
key, msgid=self.threadIndex.first()
except KeyError: finished=1
while not finished:
del self.threadIndex[key]
try:
key, msgid=self.threadIndex.next()
except KeyError: finished=1
