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#!/usr/bin/python
# Copyright (C) 2009, 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
'''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
import traceback
import gio
from jarabe import config
_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.php'
_fetcher = None
class _UpdateFetcher(object):
_CHUNK_SIZE = 10240
def __init__(self, bundle, completion_cb):
url = '%s?id=%s&appVersion=%s' % \
(_UPDATE_PATH, bundle.get_bundle_id(), config.version)
self._completion_cb = completion_cb
self._file = gio.File(url)
self._stream = None
self._xml_data = ''
self._bundle = bundle
self._file.read_async(self.__file_read_async_cb)
def __file_read_async_cb(self, gfile, result):
try:
self._stream = self._file.read_finish(result)
except:
global _fetcher
_fetcher = None
self._completion_cb(None, None, None, None, traceback.format_exc())
return
self._stream.read_async(self._CHUNK_SIZE, self.__stream_read_async_cb)
def __stream_read_async_cb(self, stream, result):
xml_data = self._stream.read_finish(result)
if xml_data is None:
global _fetcher
_fetcher = None
self._completion_cb(self._bundle, None, None, None,
'Error reading update information for %s from '
'server.' % self._bundle.get_bundle_id())
return
elif not xml_data:
self._process_result()
else:
self._xml_data += xml_data
self._stream.read_async(self._CHUNK_SIZE,
self.__stream_read_async_cb)
def _process_result(self):
document = XML(self._xml_data)
if document.find(_FIND_DESCRIPTION) is None:
logging.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
else:
try:
version = int(document.find(_FIND_VERSION).text)
except ValueError:
logging.error(traceback.format_exc())
version = 0
link = document.find(_FIND_LINK).text
try:
size = long(document.find(_FIND_SIZE).text) * 1024
except ValueError:
logging.error(traceback.format_exc())
size = 0
global _fetcher
_fetcher = None
self._completion_cb(self._bundle, version, link, size, None)
def fetch_update_info(bundle, completion_cb):
'''Queries the server for a newer version of the ActivityBundle.
completion_cb receives bundle, version, link, size and possibly an error
message:
def completion_cb(bundle, version, link, size, error_message):
'''
global _fetcher
if _fetcher is not None:
raise RuntimeError('Multiple simultaneous requests are not supported')
_fetcher = _UpdateFetcher(bundle, completion_cb)
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