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utils.py
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utils.py
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# -*- coding: utf-8 -*-
# Comet CMS v0.6.0
# Copyright © 2014-2015 Chris Warrick, Roberto Alsina, Henry Hirsch et al.
# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from __future__ import unicode_literals
from nikola.post import Post
import sys
import json
import time
__all__ = ['PERMISSIONS', 'USER_FIELDS', 'USER_ALL', 'ask', 'ask_yesno',
'SiteProxy']
USER_FIELDS = ['username', 'realname', 'password', 'email']
PERMISSIONS = ['active', 'is_admin', 'can_edit_all_posts', 'wants_all_posts',
'can_upload_attachments', 'can_rebuild_site',
'can_transfer_post_authorship']
USER_ALL = USER_FIELDS + PERMISSIONS
# The following two functions come from Nikola.
def ask(query, default=None):
"""Ask a question."""
if default:
default_q = ' [{0}]'.format(default)
else:
default_q = ''
if sys.version_info[0] == 3:
inp = raw_input("{query}{default_q}: ".format(
query=query, default_q=default_q)).strip()
else:
inp = raw_input("{query}{default_q}: ".format(
query=query, default_q=default_q).encode('utf-8')).strip()
if inp or default is None:
return inp
else:
return default
def ask_yesno(query, default=None):
"""Ask a yes/no question."""
if default is None:
default_q = ' [y/n]'
elif default is True:
default_q = ' [Y/n]'
elif default is False:
default_q = ' [y/N]'
if sys.version_info[0] == 3:
inp = raw_input("{query}{default_q} ".format(
query=query, default_q=default_q)).strip()
else:
inp = raw_input("{query}{default_q} ".format(
query=query, default_q=default_q).encode('utf-8')).strip()
if inp:
return inp.lower().startswith('y')
elif default is not None:
return default
else:
# Loop if no answer and no default.
return ask_yesno(query, default)
class SiteProxy(object):
"""A proxy for accessing the site in a multiprocessing-safe manner."""
def __init__(self, db, site, logger):
"""Initialize a proxy."""
self.db = db
self._site = site
self.config = site.config
self.messages = site.MESSAGES
self.logger = logger
self.revision = ''
self._timeline = []
self._posts = []
self._all_posts = []
self._pages = []
self.scan_posts()
def reload_site(self):
"""Reload the site from the database."""
rev = int(self.db.get('site:rev'))
if rev != self.revision and self.db.exists('site:rev'):
timeline = self.db.lrange('site:timeline', 0, -1)
self._timeline = []
for data in timeline:
data = json.loads(data)
self._timeline.append(Post(data[0], self.config, data[1],
data[2], data[3], self.messages,
self._site.compilers[data[4]]))
self._read_indexlist('posts')
self._read_indexlist('all_posts')
self._read_indexlist('pages')
self.revision = rev
self.logger.info("Site updated to revision {0}.".format(rev))
elif rev == self.revision and self.db.exists('site:rev'):
pass
else:
self.logger.warn("Site needs rescanning.")
def _read_indexlist(self, name):
"""Read a list of indexes."""
setattr(self, '_' + name, [self._timeline[int(i)] for i in
self.db.lrange('site:{0}'.format(name), 0,
-1)])
def _write_indexlist(self, name):
"""Write a list of indexes."""
d = [self._site.timeline.index(p) for p in getattr(self._site, name)]
self.db.delete('site:{0}'.format(name))
self.db.rpush('site:{0}'.format(name), *d)
def scan_posts(self, really=True, ignore_quit=False, quiet=True):
"""Rescan the site."""
while (self.db.exists('site:lock')
and int(self.db.get('site:lock')) != 0):
self.logger.info("Waiting for DB lock...")
time.sleep(0.5)
self.db.incr('site:lock')
self.logger.info("Lock acquired.")
self.logger.info("Scanning site...")
self._site.scan_posts(really, ignore_quit, quiet)
timeline = []
for post in self._site.timeline:
data = [post.source_path, post.folder, post.is_post,
post._template_name, post.compiler.name]
timeline.append(json.dumps(data))
self.db.delete('site:timeline')
self.db.rpush('site:timeline', *timeline)
self._write_indexlist('posts')
self._write_indexlist('all_posts')
self._write_indexlist('pages')
self.db.incr('site:rev')
self.db.decr('site:lock')
self.logger.info("Lock released.")
self.logger.info("Site scanned.")
self.reload_site()
@property
def timeline(self):
"""Get timeline, reloading the site if needed."""
rev = int(self.db.get('site:rev'))
if rev != self.revision:
self.reload_site()
return self._timeline
@property
def posts(self):
"""Get posts, reloading the site if needed."""
rev = int(self.db.get('site:rev'))
if rev != self.revision:
self.reload_site()
return self._posts
@property
def all_posts(self):
"""Get all_posts, reloading the site if needed."""
rev = self.db.get('site:rev')
if int(rev) != self.revision:
self.reload_site()
return self._all_posts
@property
def pages(self):
"""Get pages, reloading the site if needed."""
rev = self.db.get('site:rev')
if int(rev) != self.revision:
self.reload_site()
return self._pages