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aslo.py
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aslo.py
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# Copyright (C) 2009-2013 Sugar Labs
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
"""Activity information microformat parser.
Activity information is embedded in HTML/XHTML/XML pages using a
Resource Description Framework (RDF) http://www.w3.org/RDF/ .
An example::
<?xml version="1.0" encoding="UTF-8"?>
<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<RDF:Description about="urn:mozilla:extension:bounce">
<em:updates>
<RDF:Seq>
<RDF:li resource="urn:mozilla:extension:bounce:7"/>
</RDF:Seq>
</em:updates>
</RDF:Description>
<RDF:Description about="urn:mozilla:extension:bounce:7">
<em:version>7</em:version>
<em:targetApplication>
<RDF:Description>
<em:id>{3ca105e0-2280-4897-99a0-c277d1b733d2}</em:id>
<em:minVersion>0.82</em:minVersion>
<em:maxVersion>0.84</em:maxVersion>
<em:updateLink>http://foo.xo</em:updateLink>
<em:updateSize>7</em:updateSize>
<em:updateHash>sha256:816a7c43b4f1ea4769c61c03ea4..</em:updateHash>
</RDF:Description>
</em:targetApplication>
</RDF:Description></RDF:RDF>
"""
import logging
from xml.etree.ElementTree import XML
from gi.repository import GLib
from gi.repository import GObject
from sugar3.bundle.bundleversion import NormalizedVersion
from sugar3.bundle.bundleversion import InvalidVersionError
from jarabe import config
from jarabe.model.update import BundleUpdate
from jarabe.util.downloader import Downloader
_FIND_DESCRIPTION = \
'.//{http://www.w3.org/1999/02/22-rdf-syntax-ns#}Description'
_FIND_VERSION = './/{http://www.mozilla.org/2004/em-rdf#}version'
_FIND_LINK = './/{http://www.mozilla.org/2004/em-rdf#}updateLink'
_FIND_SIZE = './/{http://www.mozilla.org/2004/em-rdf#}updateSize'
_UPDATE_PATH = 'http://activities.sugarlabs.org/services/update-aslo.php'
_logger = logging.getLogger('ASLO')
class _UpdateChecker(GObject.GObject):
__gsignals__ = {
'check-complete': (GObject.SignalFlags.RUN_FIRST, None, (object,)),
}
_CHUNK_SIZE = 10240
def __init__(self):
GObject.GObject.__init__(self)
self._bundle = None
def check(self, bundle):
# ASLO knows only about stable SP releases
major, minor = config.version.split('.')[0:2]
sp_version = '%s.%s' % (major, int(minor) + int(minor) % 2)
url = '%s?id=%s&appVersion=%s' % \
(_UPDATE_PATH, bundle.get_bundle_id(), sp_version)
self._bundle = bundle
_logger.debug('Fetch %s', url)
self._downloader = Downloader(url)
self._downloader.connect('complete', self.__downloader_complete_cb)
self._downloader.download()
def __downloader_complete_cb(self, downloader, result):
if isinstance(result, Exception):
self.emit('check-complete', result)
return
if result is None:
_logger.error('No XML update data returned from ASLO')
return
document = XML(result.get_data())
if document.find(_FIND_DESCRIPTION) is None:
_logger.debug('Bundle %s not available in the server for the '
'version %s',
self._bundle.get_bundle_id(),
config.version)
version = None
link = None
size = None
self.emit('check-complete', None)
return
try:
version = NormalizedVersion(document.find(_FIND_VERSION).text)
except InvalidVersionError:
_logger.exception('Exception occurred while parsing version')
self.emit('check-complete', None)
return
link = document.find(_FIND_LINK).text
try:
size = int(document.find(_FIND_SIZE).text) * 1024
except ValueError:
_logger.exception('Exception occurred while parsing size')
size = 0
if version > NormalizedVersion(self._bundle.get_activity_version()):
result = BundleUpdate(self._bundle.get_bundle_id(),
self._bundle.get_name(), version, link, size)
else:
result = None
self.emit('check-complete', result)
class AsloUpdater(object):
"""
Track state while querying Activites.SugarLabs.Org for activity updates.
"""
def __init__(self):
self._completion_cb = None
self._progress_cb = None
self._cancelling = False
self._updates = []
self._checker = _UpdateChecker()
self._checker.connect('check-complete', self._check_complete_cb)
def _check_complete_cb(self, checker, result):
if isinstance(result, Exception):
logging.warning("Failed to check bundle: %r", result)
elif isinstance(result, BundleUpdate):
self._updates.append(result)
if self._cancelling:
self._completion_cb(None)
else:
GLib.idle_add(self._check_next_update)
def _check_next_update(self):
total = self._total_bundles_to_check
current = total - len(self._bundles_to_check)
progress = current / float(total)
if not self._bundles_to_check:
self._completion_cb(self._updates)
return
bundle = self._bundles_to_check.pop()
_logger.debug("Checking %s", bundle.get_bundle_id())
self._progress_cb(bundle.get_name(), progress)
self._checker.check(bundle)
def fetch_update_info(self, installed_bundles, auto, progress_cb,
completion_cb, error_cb):
self._completion_cb = completion_cb
self._progress_cb = progress_cb
self._error_cb = error_cb
self._cancelling = False
self._updates = []
self._bundles_to_check = installed_bundles
self._total_bundles_to_check = len(self._bundles_to_check)
self._check_next_update()
def cancel(self):
self._cancelling = True
def clean(self):
pass