view MoinMoin/groups/backends/ @ 4807:ca8fcf330aa8

Groups2009: Backend's _retrieve_members and is_group methods were introduced. _load_group became method of a BaseGroup to avoid code repetition. Test for empty group was added.
author Dmitrijs Milajevs <>
date Sat, 13 Jun 2009 20:44:06 +0200
parents 167db6117bb4
children 415338464695
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# -*- coding: iso-8859-1 -*-
MoinMoin - wiki group backend

The wiki group backend enables you to define groups on wiki pages.  To
find group pages, request.cfg.cache.page_group_regexact pattern is
used.  To find group members, it parses these pages and extracts the
first level list (wiki markup).

@copyright: 2008 MoinMoin:ThomasWaldmann,
            2008 MoinMoin:MelitaMihaljevic,
            2009 MoinMoin:DmitrijsMilajevs
@license: GPL, see COPYING for details

import re

from MoinMoin import caching, wikiutil
from MoinMoin.Page import Page
from MoinMoin.groups.backends import BaseGroup, BaseBackend

class Group(BaseGroup):

    def _load_group(self):
        request = self.request
        group_name =

        page = Page(request, group_name)
        if page.exists():
            arena = 'pagegroups'
            key = wikiutil.quoteWikinameFS(group_name)
            cache = caching.CacheEntry(request, arena, key, scope='wiki', use_pickle=True)
                cache_mtime = cache.mtime()
                page_mtime = wikiutil.version2timestamp(page.mtime_usecs())
                # TODO: fix up-to-date check mtime granularity problems
                if cache_mtime > page_mtime:
                    # cache is uptodate
                    self.members, self.member_groups = cache.content()
                    raise caching.CacheError
            except caching.CacheError:
                # either cache does not exist, is erroneous or not uptodate: recreate it

                super(Group, self)._load_group()

                cache.update((self.members, self. member_groups))
            raise KeyError("There is no such group page %s" % group_name)

class Backend(BaseBackend):

    def __contains__(self, group_name):
        return self.is_group(group_name) and Page(self.request, group_name).exists()

    def __iter__(self):
        return iter(self.request.rootpage.getPageList(user='',

    def __getitem__(self, group_name):
        return Group(request=self.request, name=group_name, backend=self)

    # * Member - ignore all but first level list items, strip
    # whitespace, strip free links markup. This is used for parsing
    # pages in order to find group page members.
    _group_page_parse_regex = re.compile(ur'^ \* +(?:\[\[)?(?P<member>.+?)(?:\]\])? *$', re.MULTILINE | re.UNICODE)

    def _retrieve_members(self, group_name):
        page = Page(self.request, group_name)
        text = page.get_raw_body()
        return ['member') for match in self._group_page_parse_regex.finditer(text)]