pre-signed URL doesn't work with url like /v2/queues/myqueue/messages/xxx

[Feilong Wang]

Now for zaqar presigned URL, user can only input paths like claims, messages, as a result, a URL like /v2/queues/myqueue/messages/xxx doesn't work. In other words, if we use pre signed zaqar client, the client can only post, get resources collection, and can't handle single resource.

[Feilong Wang (flwang)]

I would like to see flaper87's comments on this bug.

[Flavio Percoco (flaper87)]

I believe it was a choice to not allow for accessing objects directly.

What's the use case driving this?

[wanghao (wanghao749)]

I prefer to support it in Zaqar, if user can get resources collection with presigned URL, why not they also can get single resource?

[wanghao (wanghao749)]

Fix patch: https://review.openstack.org/#/c/401901/

[Feilong Wang (flwang)]

The user case came from the aodh zaqar driver. At that moment, user will get a 409 error when create a duplicated subscription, which will cause some unexpected errors at here https://github.com/openstack/aodh/blob/master/aodh/notifier/zaqar.py#L162

And when the zaqar driver was introduced at the first time, it doesn't support pre-signed URL. So that said, all the subscriptions have to be created in the driver, can't create in Zaqar. That's why I opened this bug.

But now, things changed. Firstly, Zaqar won't throw 409 if there is a duplicated subscription creation. And, Aodh's Zaqar driver can support pre-signed URL. So user can create subscriptions in Zaqar easily.

So, technically, we don't really have to support this now. But Flavio, would you mind explaining the design choice a bit more? Thanks.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/401901
Committed: https://git.openstack.org/cgit/openstack/zaqar/commit/?id=d3c1361f4e0521173d3ae1a614791bda5a810ce7
Submitter: Jenkins
Branch: master

commit d3c1361f4e0521173d3ae1a614791bda5a810ce7
Author: wanghao <email address hidden>
Date: Thu Nov 24 16:00:04 2016 +0800

    Support to query single resource with pre-signed url

    Now Zaqar only supports to post and get resources
    collection by using pre-signed url, this path
    add the ability to query single resource.

    Change-Id: I82b208e72a79319d9757754e34a688e86c6b0ff4
    Closes-Bug: #1596769

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/zaqar 5.0.0.0b3 development milestone.