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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks Duncan.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Should I publish a BP and spec for this? And follow it up with code changes to the server, client, horizon and documentation?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Deepti
<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Duncan Thomas [mailto:duncan.thomas@gmail.com]
<br>
<b>Sent:</b> Friday, October 16, 2015 1:08 AM<br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> Re: [openstack-dev] [Cinder] New extension API for detecting cinder-backup ?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>I think option 2 is the better one, and we can just call it something else other than capabilities. Available_services or similar<o:p></o:p></p>
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<p class="MsoNormal">On 16 Oct 2015 11:05, "Ramakrishna, Deepti" <<a href="mailto:deepti.ramakrishna@intel.com">deepti.ramakrishna@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">We need a way to let Horizon know about the presence of cinder-backup service so that it can enable the volume backup operations in the UI (</span><a href="https://bugs.launchpad.net/cinder/+bug/1334856" target="_blank"><span style="color:#1155CC;background:white">https://bugs.launchpad.net/cinder/+bug/1334856</span></a><span style="color:#222222">).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">The backup action does not have any restrictions on who can perform it as evidenced by the following policy in <a href="https://github.com/openstack/cinder/blob/master/etc/cinder/policy.json" target="_blank"><span style="color:#1155CC">etc/cinder/policy.json</span></a>:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#183691">"backup:create"</span><span style="color:#333333"> : </span>
<span style="color:#183691">""</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">However, the only API that can tell Horizon about the existence of this service, namely the "os-services" API extension (that corresponds to the "cinder service-list" client command) is admin-only:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#183691">"volume_extension:services:index"</span><span style="color:#333333">:
</span><span style="color:#183691">"rule:admin_api"</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">Today, Horizon <a href="http://docs.openstack.org/developer/horizon/topics/settings.html" target="_blank"><span style="color:#1155CC">uses</span></a> a config setting "enable_backup", that needs to be manually set in order to enable
backup functionality in Horizon. We need a way for Horizon to figure this out itself, programmatically.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">I can think of two ways:</span><o:p></o:p></p>
<ol start="1" type="1">
<li class="MsoNormal" style="color:#222222;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
Modify the services:index action to take a details=true/false parameter (<a href="http://%7bcinder-endpoint%7d/v2/%7btenant-id%7d/os-services?details=false">http://{cinder-endpoint}/v2/{tenant-id}/os-services<b>?details=false</b></a>). And define different
policies for detail=true(admin_api) and detail=false ("" i.e. unrestricted).<o:p></o:p></li></ol>
<ol start="1" type="1">
<ul type="disc">
<li class="MsoNormal" style="color:#222222;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level2 lfo2">
<span style="color:#183691">"volume_extension:services:index_with_details"</span><span style="color:#333333">:
</span><span style="color:#183691">"rule:admin_api"</span><o:p></o:p></li><li class="MsoNormal" style="color:#222222;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level2 lfo2">
<span style="color:#183691">"volume_extension:services:index_without_details"</span><span style="color:#333333">:
</span><span style="color:#183691">"”</span><o:p></o:p></li></ul>
</ol>
<ol start="2" type="1">
<li class="MsoNormal" style="color:#222222;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
Raise the abstraction level by creating a Cinder API extension that returns the list of "service capabilities". That is, the list of functionality that the cinder service supports. This will return only "volume backup" for now but can be augmented as new capabilities
are added to Cinder.<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">I don't know if #1 can be implemented in a backward compatible way and also whether there is precedence for splitting the policy of a single API call based on parameters.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">#2 seems the traditional way to do it, but I am afraid that "service capabilities" terminology clashes with existing "volume capabilities" <a href="https://github.com/openstack/cinder/blob/master/cinder/api/contrib/capabilities.py" target="_blank"><span style="color:#1155CC">extension</span></a>,
which has a different purpose.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">I would appreciate any input on this.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;background:white">
<span style="color:#222222">Deepti</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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