Creating a request copy?

[Thierry Florac]

Hi,

Simple question: I have a use case where I need to create an exact copy (a clone) of a request, to update it's properties and make "simulations" (actually by providing custom marker interfaces) without modifying the original request.

Is there a good way to do this?

Actually I just tried to do a "request.copy()", but then I get errors like "AttributeError: 'Request' object has no attribute 'root'" when trying to get access to "root" attribute...

Thanks for any help,

Thierry

[Mike Orr]

I don't have a complete answer to this, but the Request docstring says
that 'root', 'registry', and a few other attributes are added by the
router. (Commit 7bd9da, lines 160-166). The Router source assigns it
in line 122. ('attrs["root"])' is "request.__dict__["root"]').

https://github.com/Pylons/pyramid/blob/master/src/pyramid/request.py
https://github.com/Pylons/pyramid/blob/master/src/pyramid/router.py

I'd think 'copy' would still find it but there may be another
complication in the request/router/interface machinery. If you only
need the instance attributes, you could do 'myobject.__dict__ =
request.__dict__.copy()'. You might still get the same exception with
that.

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Mike Orr <slugg...@gmail.com>

[Michael Merickel]

There is no supported way to deep copy a general request object. Instead I would suggest copying the headers/body directly and replaying the request through the router as part of your simulations.

[Bobby]

The following works for me whenever celery needs a dup request:

import plaster
from pyramid.request import Request, apply_request_extensions

def make_request():
    loader = plaster.get_loader('development.ini', protocols=['wsgi'])
    app = loader.get_wsgi_app()
    r = Request.blank('/localhost:6543')
    r.registry = app.registry
    apply_request_extensions(r)
    return r

[Thierry Florac]

Hi,

My use case implies that I don't want to create a custom new request but a clone of the initial request!

I investigated a little more and found that "request.copy()" duplicates most of the initial query attributes, including properties added via "add_request_method()" (reifyed or not), except "root" and "registry".

So finally I use a function like this:

def copy_request(request):

    """Create clone of given request, keeping registry and root as well"""

    root = request.root

    request = request.copy()

    if not hasattr(request, 'registry'):

        registry = get_current_registry()

        if registry is None:

            registry = get_global_registry()

        request.registry = registry

    request.root = root

    return request

Any advise is still welcome!  ;)

Best regards,

Thierry

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