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bfe_webjournal_widget_weather.py
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Tue, Sep 17, 13:27

bfe_webjournal_widget_weather.py
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# -*- coding: utf-8 -*-
## $Id$
##
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 CERN.
##
## CDS Invenio 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.
##
## CDS Invenio 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 CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
"""
from invenio import errorlib
from invenio.config import cachedir
import feedparser
import time
from urllib2 import urlopen
from invenio.errorlib import register_exception
import re
Weather_Service = "Yahoo! Weather"
# rss feed on yahoo weather, check developer.yahoo.com/weather for details
RSS_Feed = "http://weather.yahooapis.com/forecastrss?p=SZXX0008&u=c"
# filename of the rss feed in cache
Cached_Filename = "webjournal_widget_YahooWeather.rss"
# filename of flat file in cache that holds the expire time
Expire_Time_Filename = "weather_RSS_expires"
image_pattern = re.compile('''
<img\s*(class=["']imageScale["'])*?\s*src=(?P<image>\S*)\s*/>*
'''
,re.DOTALL | re.IGNORECASE | re.VERBOSE)
def format(bfo, title_en="", title_fr=""):
"""
wrapper function needed for BibFormat to route the widget HTML
"""
out = get_widget_HTML()
if bfo.lang == "fr":
title = title_fr
else:
title = title_en
if title != "":
try:
weather_image_match = image_pattern.findall(out)[0]
weather_image = weather_image_match[1]
out = re.sub(image_pattern, "", out)
except:
register_exception(req=bfo.req)
weather_image = ""
weather_image = weather_image.replace("\"", "\'")
out = '''
<div id="weather" style="background: url(%s) left bottom no-repeat;" class="rmenuitem">
<h3 class="rmenutext">
<a href="http://weather.yahoo.com/" target="_blank">%s</a>
</h3>
</div>
<ul class="rmenulist">
%s
</ul>
''' % (weather_image, title, out)
return out
def escape_values(bfo):
"""
"""
return 0
def get_widget_HTML():
"""
weather forecast using Yahoo! Weather service
we check and store the "expires" data from the rss feed to decide when
an update is needed.
there always resides a cached version in cds cachedir along with a flat
file that indicates the time when the feed expires.
"""
try:
weather_feed = feedparser.parse('%s/%s' % (cachedir, Cached_Filename))
except:
_update_feed()
weather_feed = feedparser.parse('%s/%s' % (cachedir, Cached_Filename))
now_in_gmt = time.gmtime()
now_time_string = time.strftime( "%a, %d %b %Y %H:%M:%S GMT", now_in_gmt)
try:
expire_time_string = open('%s/%s' (cachedir, Expire_Time_Filename)).read()
expire_time = time.strptime(open(Expire_Time_Filename).read(), "%a, %d %b %Y %H:%M:%S %Z")
#expire_time['tm_isdt'] = 0
expire_in_seconds = time.mktime(expire_time)
now_in_seconds = time.mktime(now_in_gmt)
diff = time.mktime(expire_time) - time.mktime(now_in_gmt)
except:
diff = -1
if diff < 0:
_update_feed()
weather_feed = feedparser.parse('%s/%s' % (cachedir, Cached_Filename))
# construct the HTML
html = weather_feed.entries[0]['summary']
return html
def _update_feed():
"""
helper function that updates the feed by copying the new rss file to the
cache dir and resetting the time string on the expireTime flat file
"""
feed = urlopen(RSS_Feed)
cached_file = open('%s/%s' % (cachedir, Cached_Filename), 'w')
cached_file.write(feed.read())
cached_file.close()
feed_data = feedparser.parse(RSS_Feed)
expire_time = feed_data.headers['expires']
expire_file = open('%s/%s' % (cachedir, Expire_Time_Filename), 'w')
expire_file.write(expire_time)
expire_file.close()
if __name__ == "__main__":
from invenio.bibformat_engine import BibFormatObject
myrec = BibFormatObject(7)
format(myrec)

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