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# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.
#
# Syndicate LiveJournal users
# Demonstrates how to use chained callbacks
from __future__ import nested_scopes
from twisted.web import resource as resourcelib
from twisted.web import client, microdom, domhelpers, server
urlTemplate = 'http://www.livejournal.com/users/%s/rss'
class LJSyndicatingResource(resourcelib.Resource):
def render_GET(self, request):
url = urlTemplate % request.args['user'][0]
client.getPage(url).addCallback(
microdom.parseString).addCallback(
lambda t: domhelpers.findNodesNamed(t, 'item')).addCallback(
lambda itms: zip([domhelpers.findNodesNamed(x, 'title')[0]
for x in itms],
[domhelpers.findNodesNamed(x, 'link')[0]
for x in itms]
)).addCallback(
lambda itms: '<html><head></head><body><ul>%s</ul></body></html>' %
'\n'.join(
['<li><a href="%s">%s</a></li>' % (
domhelpers.getNodeText(link), domhelpers.getNodeText(title))
for (title, link) in itms])
).addCallback(lambda s: (request.write(s),request.finish())).addErrback(
lambda e: (request.write('Error: %s' % e),request.finish()))
return server.NOT_DONE_YET
resource = LJSyndicatingResource()
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