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<div>One comment: even though health_monitor is introduced as part of LB effort, it has more general applicability. So having it under LB specific resource may pose usability problems down the road when new services are introduced, if health monitor is to be
re-used for that purpose. One solution is to make it "first class" citizen with relationship to "pool" and/or make "pool" assume more abstract pooling semantics, reusable as well across multiple services in the future. (yes, I am talking about "groups" here
:) ).</div>
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<span style="font-weight:bold">From: </span>Salvatore Orlando <<a href="mailto:sorlando@nicira.com">sorlando@nicira.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>OpenStack Development Mailing List <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, November 15, 2012 7:40 AM<br>
<span style="font-weight:bold">To: </span>OpenStack Development Mailing List <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [quantum] Quantum extension framework issue<br>
</div>
<div><br>
</div>
<blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div>Hi Oleg,
<div><br>
</div>
<div>This is exactly what I was talking about.</div>
<div>One thing you might want to consider before choosing for one direction or the other is that at the moment Quantum API does not use sub resources at all.</div>
<div>There was a long discussion on this regard while designing the v2 API. The gist of the discussion was that if a resource needed sub-resources then there was a case for a sub-resource to become a 'first citizen' in the API. I am pretty sure you already
have mulled over whether health_monitors should be a resource of their own, a sub resource of the pool, or a multi-valued attribute of the pool, but I wanted to give you a heads-up anyway.</div>
<div><br>
</div>
<div>On your technical questions I have some answers inline.</div>
<div><br>
</div>
<div>Salvatore<br>
<br>
<div class="gmail_quote">On 15 November 2012 15:40, Oleg Bondarev <span dir="ltr">
<<a href="mailto:obondarev@mirantis.com" target="_blank">obondarev@mirantis.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Hi folks,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">As Salvatore said there is a way to specify parent for a resource (see quantum.extensions.extensions.ResourceExtension) which allows route mapping
for rest calls like:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">POST /v1.0/pools/{pool_id}/health_monitors<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">DELETE /v1.0/pools/{pool_id}/health_monitors/{id}<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">…<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">In this case corresponding resource controller should be aware of resource parent and be able to handle CRUD operations with an additional parent_id
parameter. Currently it doesn’t. Actually I am speaking about quantum.api.v2.base.Controller – so, Salvatore, do you think it is the right place to include sub-resource/parent handling?</span></p>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Working on controllers in quantum.api.v2 is the best option in my opinion. </div>
<div>This however depends on how the route mapper associates controllers with sub resources. Currently, the extension framework and the core API use two distinct code paths: the former uses quantum.extensions.extensions.ExtensionMiddleware whereas the latter
uses quantum.api.v2.router.APIRouter (this is for historical reasons only; as far as I can recall, there's no technical reason for this). The Extension Middleware has a mechanism for mapping associating parent resources to a mapped resource, whereas the APIRouter
does not have such mechanism.</div>
<div><br>
</div>
<div>As the controller does not care about how URI paths are mapped on its methods, the only thing we probably need to worry about is how to make sure that the parent resource id is passed to the controller for the sub-resource. To this aim, I would probably
define a new controller which extends the base one rather than modifying quantum.api.v2.base.Controller.</div>
<div>Btw, there is of course the hackish way of skipping base.create_resource and passing to ResourceExtension an object providing implementation for the appropriate methods. I am totally sure you're aware of this option too, but I would consider it only a
last resort.</div>
<div><br>
</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">And also how do you guys think should this improvement be done as a separate patch?</span></p>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Separate patches in these cases are always preferred. </div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Thanks,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Oleg<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<div>
<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "> Youcef Laribi [mailto:<a href="mailto:Youcef.Laribi@eu.citrix.com" target="_blank">Youcef.Laribi@eu.citrix.com</a>]
<br>
<b>Sent:</b> Wednesday, November 14, 2012 11:03 PM</span></p>
<div>
<div class="h5"><br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> Re: [openstack-dev] [quantum] Quantum extension framework issue<u></u><u></u></div>
</div>
<p></p>
</div>
</div>
<div>
<div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Oleg,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">The
</span><span style="font-size: 11pt; font-family: Calibri, sans-serif; ">“</span><span style="font-size: 11pt; font-family: 'Courier New'; ">/pools/{pool_id}/health_monitors</span><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">”
REST resource is intended to be a collection sub-resource of the “</span><span style="font-size: 11pt; font-family: 'Courier New'; ">/pools/{pool_id}</span><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">” resource,
so if the Quantum WSGI framework can be improved to support REST sub-resources that would be better and cleaner.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Youcef<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><a name="13b04875835461eb__MailEndCompose"></a><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "> Salvatore Orlando
<a href="mailto:[mailto:sorlando@nicira.com]" target="_blank">[mailto:sorlando@nicira.com]</a><br>
<b>Sent:</b> Wednesday, November 14, 2012 10:00 AM<br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> Re: [openstack-dev] [quantum] Quantum extension framework issue<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">Hi Oleg,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal">When I read your first email, I had the same impression as Dan.<u></u><u></u></p>
<div>
<p class="MsoNormal">health_monitors look more like a subresource than an action. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">The WSGI framework at the moment is not able to manage subresources; this does not mean we cannot improve it though. Nevertheless, in this case the route mapping is not performed by the API classes in quantum/api, but by the extension manager.
I think there should already be a way for specifying parent resources with extensions, but that needs to be explored.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">It seems however that you are now trying to map operations on health monitors using distinct member actions (add_health_monitor, get_health_monitors). This is similar to what happens with the L3 API for router interfaces.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">However, it seems the original idea behind the API design was to treat health_monitors as an explicit collection, which would also be probably a more 'restful' way of doing it. I think ultimately the question
should be directed to Youcef and the team which contributed to the design of the LBaaS API.<u></u><u></u></p>
<div>
<p class="MsoNormal">On 14 November 2012 17:18, Oleg Bondarev <<a href="mailto:obondarev@mirantis.com" target="_blank">obondarev@mirantis.com</a>> wrote:<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Hi Dan,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Thanks for your comment here.
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Just wanted to correct a mistake in my first email: of course there can’t be a dict with duplicate keys. The idea was to use list of pairs, like:</span><u></u><u></u></p>
<div>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">member_actions = [{“health_monitors”: “GET”},
</span><u></u><u></u></p>
</div>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> {“health_monitors”: “POST”}]</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">to have an ability of using same function name with different request actions. Initially I thought that the framework provides such ability but does
not dispatch requests correctly. I was wrong.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Actually there is no issue with the framework as it assumes using unique action names for different request methods.
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">I believe we should update LBaaS REST API doc and use “get_health_monitors”, “add_health_monitors”, etc. to fit in the framework.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Thanks,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; ">Oleg</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125); font-family: Calibri, sans-serif; "> </span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "> Dan Wendlandt [mailto:<a href="mailto:dan@nicira.com" target="_blank">dan@nicira.com</a>]
<br>
<b>Sent:</b> Wednesday, November 14, 2012 7:27 PM<br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> Re: [openstack-dev] [quantum] Quantum extension framework issue</span><u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Hi Oleg,<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Folks from the API-subteam can correct me, but I believe this use model is outside of what the API framework was trying to enable with "actions". The idea is that you use POST/DELETE to create an delete API "resources" (which actually
have UUIDs, for example, the "pool" in your example below) and then do a PUT to an "action" to cause some kind of change that you can affect on a resource (e.g., "add_health_monitor" or "remove_health_monitor"). It sounds like what you are proposing is more
treating "health_monitors" almost as a "sub-resource", which is not really what the "actions" stuff was designed for. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">I haven't been deeply involved in the LBaaS api design discussion though, so I'd also like to hear from Salvatore, et al. on the API sub-team.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Dan<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal">On Wed, Nov 14, 2012 at 6:05 AM, Oleg Bondarev <<a href="mailto:obondarev@mirantis.com" target="_blank">obondarev@mirantis.com</a>> wrote:<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal"><span style="color:#1f497d">Hi guys,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">While working on the API extension for LBaaS I didn’t find a way to use custom member actions if they have the same name and differ only by request method, for example</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal" style="background:#f3f5f7"><span lang="EN" style="font-family:Courier">List all health monitors of a specific pool: GET /pool/pool_id/health_monitors</span><u></u><u></u></p>
<p class="MsoNormal" style="background:#f3f5f7"><span lang="EN" style="font-family:Courier">Associate health monitors with a pool: POST /pool/pool_id/health_monitors</span><u></u><u></u></p>
<p class="MsoNormal" style="background:#f3f5f7"><span lang="EN"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">In quantum extension framework we pass
</span><span lang="EN" style="color:#1f497d">“health_monitors” as member actions for a controller (quantum.api.v2.base.create_resource())</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN"> </span><u></u><u></u></p>
<p class="MsoNormal">member_actions = {'<span lang="EN">health_monitors</span>': 'GET',<u></u><u></u></p>
<p class="MsoNormal"> '<span lang="EN">health_monitors</span>': 'POST'}<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">controller = base.create_resource(collection_name,<u></u><u></u></p>
<p class="MsoNormal"> resource_name,<u></u><u></u></p>
<p class="MsoNormal"> plugin, params,<u></u><u></u></p>
<p class="MsoNormal"> member_actions=member_actions)<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">According to the Controller implementation it dispatches all custom member actions to its plugin attr:</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">def __getattr__(self, name):<u></u><u></u></p>
<p class="MsoNormal"> if name in self._member_actions:<u></u><u></u></p>
<p class="MsoNormal"> def _handle_action(request, id, body=None):<u></u><u></u></p>
<p class="MsoNormal"> return getattr(self._plugin, name)(request.context, id, body)<u></u><u></u></p>
<p class="MsoNormal"> return _handle_action<u></u><u></u></p>
<p class="MsoNormal"> else:<u></u><u></u></p>
<p class="MsoNormal"> raise AttributeError<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Where request.context is of type quantum.context.Context and does not contain info about request method.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">As a result there is no way to distinguish two custom actions in the plugin.
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Is it an issue in the framework?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Possible solution may be in concatenation of request method and action name (“get_health_monitors”, “post_health_monitors”) in a controller before dispatching them to a plugin.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">What do you think? </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Thanks,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Oleg</span><u></u><u></u></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
_______________________________________________<br>
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<a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><u></u><u></u></p>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<p class="MsoNormal">-- <br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
Dan Wendlandt <u></u><u></u></p>
<div>
<p class="MsoNormal">Nicira, Inc: <a href="http://www.nicira.com" target="_blank">www.nicira.com</a><u></u><u></u></p>
<div>
<p class="MsoNormal">twitter: danwendlandt<br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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</div>
<p class="MsoNormal"><u></u> <u></u></p>
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