[Twisted-web] Problem with twisted web and adbapi

[Phil Mayers]

Oops, sorry that should be:

def render_GET(self, request):
    def cb(data):
        request.write(data)
        request.finish()

    # note, we add our callback to the deferred then discard it
    self.opt.dbpool.runInteraction(blah).addCallback(cb)

    # we *return* a special value
    return server.NOT_DONE_YET