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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Vojtech,<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">The patch is great and has cleared up some questions I had about the implementation. I’ve been able to get the sample plugins working and waded through the
code changes, so feel like I have a good understanding of what was delivered. Thanks a lot for putting this all together. I do have a few questions and suggestions for you, though.<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">Will there eventually be a way to add one or more buttons to the context sensitive buttons and menus throughout the interface? For example, we’d like to allow
a button to provision a datastore when a data center, cluster, or host is selected. When the button is clicked, it would open a dialog with an iframe in which we would load our interface to perform the associated action. Some contexts would have several buttons,
such as a storage domain (provision, resize, dedupe management, destroy) so it would probably make sense for a drop down menu to be available as well so that the number of buttons above the table doesn’t get too cluttered. We’d also like to add these same
actions to the menus that popup when a contextual object is right clicked.<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">If needed we can help work on an implementation for the dialog popup plugin framework as we’d like to get it in relatively quickly so we can move forward on
the content side of our plugin.<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">For the reverse proxy, would it be easier from a customer standpoint to just include a reverse proxy servlet such as this one? </span><a href="http://sourceforge.net/projects/j2ep/">http://sourceforge.net/projects/j2ep/</a>
<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m just thinking that setting up and managing a plugin for the HTTP server may be more complex than including one internally that would be transparent to a
customer.<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">Chris<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b>From:</b> Vojtech Szocs <<a href="mailto:vszocs@redhat.com">vszocs@redhat.com</a>><br>
<b>Date:</b> September 21, 2012 4:37:31 PM EDT<br>
<b>To:</b> engine-devel <<a href="mailto:engine-devel@ovirt.org">engine-devel@ovirt.org</a>><br>
<b>Subject:</b> <b>[Engine-devel] UI Plugins: PoC patch revision 5 is here</b><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black">Hi guys,<br>
<br>
it's been a while but here comes the latest revision of UI Plugins proof-of-concept patch (please find it attached).<br>
<br>
This revision was originally meant to focus solely on server-side components of the plugin infrastructure. However, I ended up implementing all the major concepts and ideas as discussed on engine-devel mailing list, impacting both client-side and server-side
parts of the plugin infrastructure. As a result, UI plugin infrastructure should be pretty much complete now, so we can focus on specific plugin API features in upcoming PoC revisions.<br>
<br>
There's a whole bunch of changes and improvements in this revision, so I'll try to cover all the relevant parts step by step. If you have any comments, questions or ideas, please let me know!<br>
<br>
So here we go... (or if you just want to get the patch, find the link at the end of this message)<o:p></o:p></span></p>
<div class="MsoNormal" align="center" style="text-align:center"><span style="color:black">
<hr size="2" width="100%" align="center">
</span></div>
<p class="MsoNormal"><span style="color:black"><br>
<strong>0. Added new Engine configuration values</strong><b><br>
</b><br>
<u>UI plugin data path</u> is represented by <em>ConfigValues.UIPluginDataPath</em> enum option ("UIPluginDataPath" in
<i>vdc_options</i> table), and resolved relative to <i>ConfigValues.DataDir</i> if possible. Following (default) values:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i>UIPluginDataPath = ui-plugins</i><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i>DataDir = /usr/share/ovirt-engine</i><o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black">result in UI plugin data path: <i>
/usr/share/ovirt-engine/ui-plugins</i><br>
<br>
<u>UI plugin config path</u> is represented by <i>ConfigValues.UIPluginConfigPath</i> enum option ("UIPluginConfigPath" in
<i>vdc_options</i> table), and resolved relative to <i>ConfigValues.ConfigDir</i> if possible. Following (default) values:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
<i>UIPluginConfigPath = ui-plugins</i><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo2">
<i>ConfigDir = /etc/ovirt-engine</i><o:p></o:p></li></ul>
<p><span style="color:black">result in UI plugin config path: <i>/etc/ovirt-engine/ui-plugins</i><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><br>
<b>1. Processing UI plugin data on the server<br>
</b><br>
<i>PluginDataManager</i> is the class responsible for reading, validating and caching UI plugin descriptor/configuration data on the server (Engine). It has two main responsibilities:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3">
return a snapshot of currently valid plugin data (<i>getCurrentData</i> method)<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3">
reload plugin data from local file system if necessary (<i>reloadData</i> method)<o:p></o:p></li></ul>
<p><span style="color:black">The <i>reloadData</i> method doesn't modify "live" plugin data directly. Instead, it creates a local working copy of current plugin data, updates this copy as it reads/validates plugin descriptor and configuration files, and attempts
to update "live" plugin data through conditional reference re-assignment (using <i>
java.util.concurrent.atomic.AtomicReference.compareAndSet</i> method).<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">In other words, <i>reloadData</i> method makes no attempts with regard to Java lock-based synchronization, in favor of dealing with "live" data through
<i>AtomicReference</i> (reference that involves atomic <i>volatile</i> reads and writes):<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo4">
In the best case, a thread will succeed in updating "live" data (<i>AtomicReference.compareAndSet</i> == true), which means that "live" data remained unchanged since this thread acquired a reference of current plugin data.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo4">
In the worst case, a thread will NOT succeed in updating "live" data (<i>AtomicReference.compareAndSet</i> == false), which means that "live" data was already changed by another thread since this thread acquired a reference of current plugin data.<o:p></o:p></li></ul>
<p><span style="color:black">In my opinion, when dealing with external resources like the local file system, this is a good compromise between performance and up-to-date data. While we might not get "completely-up-to-date" data at the given point in time (<i>reloadData
+ getCurrentData</i>), we are guaranteed to get "recently-up-to-date" and consistent data. In other words, the requirement of "completely-up-to-date" data would involve
<i>synchronized</i> statements that would hurt performance. In my (very humble) opinion, the benefit of having "completely-up-to-date" data, at the cost of reduced performance, is not really worth it, especially in our case when the user can just hit refresh
(F5) to reload WebAdmin and its plugin data.<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><u><span style="color:black">Plugin descriptor files</span></u><span style="color:black"> are expected to be placed in UI plugin data path, for example:
<i>/usr/share/ovirt-engine/ui-plugins/foo.json</i><o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">Following descriptor file attributes are implemented and recognized by the plugin infrastructure:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lfo5">
<i>name</i>: A name that uniquely identifies the plugin (required attribute).<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lfo5">
<i>url</i>: URL of plugin host page that invokes the plugin code (required attribute).<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lfo5">
<i>config</i>: Default configuration object associated with the plugin (optional attribute).<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lfo5">
<i>resourcePath</i>: Path to plugin static resources, relative to UI plugin data path (optional attribute). This is used when serving plugin files through Engine
<i>PluginResourceServlet</i> (more on this below).<o:p></o:p></li></ul>
<p><u><span style="color:black">Plugin configuration files</span></u><span style="color:black"> are expected to be placed in UI plugin config path, for example:
<i>/etc/engine/ui-plugins/foo-config.json</i><o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">Note that plugin configuration files follow the "<descriptorFileName>-config.json" convention.<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">Following configuration file attributes are implemented and recognized by the plugin infrastructure:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo6">
<i>config</i>: Custom configuration object associated with the plugin (optional attribute). This overrides the default plugin descriptor configuration, if any.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo6">
<i>enabled</i>: Indicates whether the plugin should be loaded on WebAdmin startup (optional attribute). Default value is 'true'.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo6">
<i>order</i>: Defines the relative order in which the plugin will be loaded on WebAdmin startup (optional attribute). Default value is
<i>Integer.MAX_VALUE</i> (lowest order).<o:p></o:p></li></ul>
<p><span style="color:black">The concept of merging custom configuration (<i>config</i> attribute in
<i>foo-config.json</i>), if any, on top of default configuration (<i>config</i> attribute in
<i>foo.json</i>), if any, remains unchanged. This makes the plugin configuration quite flexible - in my opinion, the added complexity of handling/merging such configuration is definitely worth the effort.<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">The <i>enabled</i> attribute is straight-forward, allowing users to turn the given plugin off, if necessary. In future, users should still be able to load such plugins through WebAdmin GUI.<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">The <i>order</i> attribute controls the order in which plugins are loaded on WebAdmin startup. Since plugin resources are fetched asynchronously by the browser, this is basically a way of imposing some degree of determinism in the
"generally-non-deterministic" plugin environment, which is helpful when troubleshooting problems with multiple plugins. This attribute is also helpful due to file listing methods in
<i>java.io.File</i> giving no guarantees that files would be listed in any particular order (otherwise we could just go for the "NN-<descriptorFileName>.json" convention, with NN being the order number).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><br>
<b>2. Modified behavior of WebadminDynamicHostingServlet<br>
</b><br>
<i>WebadminDynamicHostingServlet</i> is the servlet used to serve WebAdmin application host page (HTML page that bootstraps WebAdmin JavaScript code).<br>
<br>
In addition to its former behavior, as part of handling the given request, <i>WebadminDynamicHostingServlet</i>:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo7">
reloads descriptor/configuration data from local file system if necessary, and obtains a snapshot of currently valid plugin data (<i>PluginDataManager.reloadAndGetCurrentData</i>)<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo7">
embeds all plugin meta-data, suitable for use in client-side plugin infrastructure, into WebAdmin host page as "pluginDefinitions" JavaScript array (<i>PluginDefinitions</i>)<o:p></o:p></li></ul>
<p class="MsoNormal"><span style="color:black">As a result, reloading UI plugin descriptor/configuration data is as simple as refreshing (F5) WebAdmin application in the browser (no need to restart Engine).<br>
<br>
<b>3. Added servlet for serving plugin static resources<br>
</b><br>
<i>PluginResourceServlet</i> is the servlet used to serve UI plugin static files (plugin host page, 3rd party JavaScript, etc.) from the local file system.<br>
<br>
For example, requesting URL:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l5 level1 lfo8">
<i><a href="http://%3cEngineManagerHost%3e:8700/webadmin/webadmin/plugin/foo/content/start.html">http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/start.html</a></i><o:p></o:p></li></ul>
<p><span style="color:black">will send the content of:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo9">
<i>/usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.html</i><o:p></o:p></li></ul>
<p><span style="color:black">to the client.<o:p></o:p></span></p>
<p><span style="color:black"><o:p> </o:p></span></p>
<p><span style="color:black">As shown in the above example:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level1 lfo10">
<i>/webadmin/webadmin/plugin/</i> is the servlet root path for <i>PluginResourceServlet</i><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level1 lfo10">
in the extra path beyond the servlet root path (<i>/foo/content/start.html</i>):<o:p></o:p></li></ul>
<ul type="disc">
<ul type="circle">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level2 lfo10">
<i>/foo</i> represents the name of the plugin<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level2 lfo10">
<i>/content/start.html</i> represents the path to requested resource, relative to "UIPluginDataPath / <resourcePath>"<o:p></o:p></li></ul>
</ul>
<p class="MsoNormal"><span style="color:black">Note that each plugin using <i>PluginResourceServlet</i> to serve its static files must declare non-empty
<i>resourcePath</i> attribute in within the plugin descriptor.<br>
<br>
Also note that <i>PluginResourceServlet</i>, unlike <i>WebadminDynamicHostingServlet</i>, does NOT reload descriptor/configuration data from local file system as part of handling the given request. In other words, it's assumed that plugin data has already been
(re)loaded when serving WebAdmin application host page, with subsequent requests to
<i>PluginResourceServlet</i> reading the current plugin information.<br>
<br>
Until we solve the cross-origin issue in a clean way, <i>PluginResourceServlet</i> should be used to serve all plugin resources from local file system.<br>
<br>
<b>4. Plugin lifecycle improved to deal with misbehaving plugins</b><br>
<br>
<i>PluginState</i> enum has been modified to deal with plugins that allow uncaught exceptions to escape from plugin event handler functions (e.g. "UiInit"):<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 lfo11">
removed state <i>INITIALIZED</i><o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 lfo11">
added state <i>INITIALIZING</i>: The plugin is (currently) being initialized by calling UiInit event handler function.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 lfo11">
added state <i>IN_USE</i>: Plugin's UiInit event handler function has completed successfully, we can now call other event handler functions as necessary. The plugin is in use now.<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 lfo11">
added state <i>FAILED</i>: An uncaught exception escaped while calling an event handler function, which indicates internal error within the plugin code. The plugin is removed from service.<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black">I've attached a simple state diagram that illustrates different states and transitions between them (green color is initial state, red color is end state).<br>
<br>
Uncaught exceptions in plugin event handler functions will be caught and handled by the plugin infrastructure. This prevents a misbehaving plugin from breaking WebAdmin application, since WebAdmin is the caller (initiator) of the function call. In such case,
the plugin will be removed from service.<br>
<br>
<b>Update on cross-origin issue (consequence of same-origin policy)</b><br>
<br>
In order for the plugin to access WebAdmin plugin API, plugin host page (e.g. <i>
start.html</i>) must be served from URL on same origin as Engine origin. Otherwise, plugin code running in the context of an iframe'd host page will fail to evaluate "parent.pluginApi" expression, with "parent" being top-level (WebAdmin) window, and "pluginApi"
being the global plugin API object exposed by WebAdmin.<br>
<br>
This is why <i>PluginResourceServlet</i>, available on Engine origin, should be used to serve all plugin resources from local file system.<br>
<br>
There's only one issue that remains to be solved: cross-origin "plugin vs. remote service" communication, with "remote service" being anything other than Engine (REST API). In future, we'll address this with Apache reverse proxy configuration, so that users
can configure Apache server (placed in front of Engine JBoss AS) to put arbitrary (local or remote non-Engine) services on same origin. However, this requires a change in current Apache configuration. Until then, users can manually edit the Engine Apache configuration
file (<i>/etc/httpd/conf.d/ovirt-engine.conf</i>).<o:p></o:p></span></p>
<div class="MsoNormal" align="center" style="text-align:center"><span style="color:black">
<hr size="2" width="100%" align="center">
</span></div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black"><br>
I've attached some sample plugin files for you to experiment with. Instead of attaching actual patch file (92 kB) to this email, I've submitted the patch to oVirt Gerrit:
<a href="http://gerrit.ovirt.org/8120">http://gerrit.ovirt.org/8120</a><br>
<br>
Let me know what you think!<br>
<br>
Cheers,<br>
Vojtech<o:p></o:p></span></p>
</div>
</div>
</blockquote>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><ui-plugin-sample-files.tar.gz><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><ui-plugin-lifecycle.png><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">_______________________________________________<br>
Engine-devel mailing list<br>
<a href="mailto:Engine-devel@ovirt.org">Engine-devel@ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/engine-devel">http://lists.ovirt.org/mailman/listinfo/engine-devel</a><o:p></o:p></p>
</div>
</blockquote>
</div>
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