[Twisted-web] Using deferreds to render a page
A. Goryunov
agoryunov at list.ru
Mon Dec 5 11:16:05 MST 2005
I might be just dumb, but I can't figure out the correct way to do what
the following passage from Twisted.web's Howto suggests:
"/Request a |Deferred|, return |server.NOT_DONE_YET|, and call
|request.write("stuff")| and |request.finish()| later, in a callback on
the |Deferred|/."
How do I get at the request object from a callback function? All the
documentation on Deferreds that I managed to find uses print's to
display results, but that doesn't help any, since I intend to present
output to a remote user rather than myself. For now I've settled with
using the following method:
class PrintResult(object):
def __init__(self, request):
self.request = request
def __call__(self, *args):
l = args[0]
if l:
self.request.write("<html>ID is %s</html>" % str(l[0][0]))
else:
self.request.write( "<html>No ID found</html>")
self.request.finish()
return server.NOT_DONE_YET
So that the request is stored inside the callback itself, but this
somehow feels wrong. Is there some standard way of doing this that I am
missing?
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