Open Stack

David, Chmouel,
Thank you for the pointers!
I will look into it soon, hoping it solves my needs.

Sorry for not posting to the dev-list from the beginning. I wasn't aware of
it...

- Itamar.


On Mon, Apr 22, 2013 at 8:06 PM, David Goetz <david.goetz at rackspace.com>wrote:

> There are examples in swift.common.middleware of doing this.
>
> If you want to try changing the metadata on the way out you can look at:
>
>
> https://github.com/openstack/swift/blob/master/swift/common/middleware/staticweb.py#L367-L384
>
> it makes use of the WSGIContext class which allows you to make a call down
> the pipeline and respond to it on the way back out.
>
> If you want to just kinda peek at the object before sending the request
> you can use make_pre_authed_request as done here for containers:
>
>
> https://github.com/openstack/swift/blob/master/swift/common/middleware/staticweb.py#L198-L201
>
> that function will take auth out of the environment so you want to be
> careful about using it. It you want to keep auth you can do something along
> the lines of:
>
>
> https://github.com/openstack/swift/blob/master/swift/common/middleware/bulk.py#L250-L259
>
> which just makes a sub request using a copy of the current environment. In
> your case, after you get that response you'd probably just want to let the
> request continue on the pipeline instead of just completely overriding it
> like the bulk middleware does.
>
> David
>
>
>
>
>
> On Apr 21, 2013, at 10:11 AM, Itamar O wrote:
>
> > Hello list,
> > I am new to OpenStack development, and trying to implement a simple
> Swift middleware.
> > I was able to successfully manipulate a PUT request for an object,
> processing the data that was uploaded by the request and storing some
> information in the object metadata.
> > But now I am struggling with handling GET requests for objects.
> > I would like to access the data and metadata of the requested object
> before it is passed down the pipeline, but I have no clue how to achieve
> this.
> >
> > In case this is not the appropriate mailing list for this question, I
> apologize, and would appreciate if someone could refer me to the correct
> list.
> > Otherwise, any advice will be much appreciated!
> >
> > Thanks,
> > - Itamar.
> > _______________________________________________
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>
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