CODEWITHSUNDEEP
pythoncallbackhooktwisted
joseph
joseph

Reputation:

How to add hooks in twisted.web (or twisted.web2)?

How can I add a hook before and after processing a request on twisted.web (twisted.web2 is fine too)? The equivalent of webpy's:

app = web.application(urls, globals())
app.add_processor(web.loadhook(my_attach_callback))
app.add_processor(web.unloadhook(my_detach_callback))

Thanks!

Upvotes: 2

Views: 433

Answers (1)

Jean-Paul Calderone
Jean-Paul Calderone

Reputation: 48335

One approach Twisted Web allows is to insert an extra resource into the resource hierarchy the only purpose of which is to run your custom hooks, rather than to actually handle a segment of the request URL as resources typically do.

You can find an implementation of this approach in twisted/web/_auth/wrapper.py which implements the HTTPAuthSessionWrapper resource (exposed publicly in twisted.web.guard). Note the first line of getChildWithDefault which ensures the resource doesn't consume one of the request segments. This allows it to sit in the resource hierarchy, modify behavior, but not otherwise change the way URLs are dispatched.

Upvotes: 1

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