# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.
#
# Author: Clark Evans (cce@clarkevans.com)
""" flow.web
This contains wrappers to apply flow to components in twisted.web.*
"""
from controller import Deferred
from twisted.web import resource, server
from twisted.python.failure import Failure
class Resource(resource.Resource):
"""
A resource which uses flow in its page generation.
Use it like this::
from __future__ import generators
from twisted.flow import flow
def render(req):
req.write("Delayed")
req.write("Delayed WebPage
")
yield flow.Cooperate(5)
req.write("Delayed Content
")
if __name__=='__main__':
from twisted.internet import reactor
from twisted.web.server import Site
from twisted.flow.web import Resource
print "visit http://localhost:8081/ to view"
reactor.listenTCP(8081,Site(Resource(render)))
reactor.run()
"""
def __init__(self, gen):
resource.Resource.__init__(self)
self.gen = gen
def isLeaf(self):
return true
def render(self, req):
self.d = Deferred(self.gen(req))
self.d.addErrback(lambda fail: fail.printTraceback())
self.d.addBoth(lambda ret: req.finish() or ret)
return server.NOT_DONE_YET