tween and callbacks

gistfile1.py

from pyramid.config import Configurator
from pyramid.view import view_config
from pyramid.events import NewRequest, NewResponse, subscriber

@view_config(route_name='hello', renderer='string')
def hello(request):
    print "View hello"
    return 'Hello'

def response_callback(request, response):
    print "response_callback"

def finish(request):
    print "finished_callback"

@subscriber(NewResponse)
def new_response(event):
    print "NewResponse"

@subscriber(NewRequest)
def new_request(event):
    print "NewRequest"
    event.request.add_response_callback(response_callback)
    event.request.add_finished_callback(finish)

def tween_factory(handler, registry):
    def tween(request):
        print "tween_in"
        res = handler(request)
        print "tween_out"
        return res
    return tween

if __name__ == '__main__':
    config = Configurator()
    config.add_tween('.tween_factory')
    config.add_route('hello','/')
    config.scan()
    app = config.make_wsgi_app()
    from wsgiref.simple_server import make_server
    make_server('0.0.0.0', 6543, app).serve_forever()

tween_in
NewRequest
View hello
tween_out
response_callback
NewResponse
finished_callback