11:15 a.m.
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Hi Vojtech,
The patch is great and has cleared up some questions I had about the implem=
entation. I've been able to get the sample plugins working and waded throug=
h the code changes, so feel like I have a good understanding of what was de=
livered. Thanks a lot for putting this all together. I do have a few questi=
ons and suggestions for you, though.
Will there eventually be a way to add one or more buttons to the context se=
nsitive 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 a=
n iframe in which we would load our interface to perform the associated act=
ion. Some contexts would have several buttons, such as a storage domain (pr=
ovision, resize, dedupe management, destroy) so it would probably make sens=
e for a drop down menu to be available as well so that the number of button=
s above the table doesn't get too cluttered. We'd also like to add these sa=
me actions to the menus that popup when a contextual object is right clicke=
d.
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 forw=
ard on the content side of our plugin.
For the reverse proxy, would it be easier from a customer standpoint to jus=
t include a reverse proxy servlet such as this one? http://sourceforge.net=
/projects/j2ep/
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 transparen=
t to a customer.
Thanks,
Chris
From: Vojtech Szocs <vszocs@redhat.com<mailto:vszocs@redhat.com> Date: September 21, 2012 4:37:31 PM EDT
To: engine-devel <engine-devel@ovirt.org<mailto:engine-devel@ovirt.org> Subject: [Engine-devel] UI Plugins: PoC patch revision 5 is
here
Hi guys,
it's been a while but here comes the latest revision of UI Plugins proof-of=
-concept patch (please find it attached).
This revision was originally meant to focus solely on server-side component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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.
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!
So here we go... (or if you just want to get the patch, find the link at th=
e end of this message)
________________________________
0. Added new Engine configuration values
UI plugin data path is represented by ConfigValues.UIPluginDataPath enum op=
tion ("UIPluginDataPath" in vdc_options table), and resolved relative to Co=
nfigValues.DataDir if possible. Following (default) values:
* UIPluginDataPath =3D ui-plugins
* DataDir =3D /usr/share/ovirt-engine
result in UI plugin data path: /usr/share/ovirt-engine/ui-plugins
UI plugin config path is represented by ConfigValues.UIPluginConfigPath enu=
m option ("UIPluginConfigPath" in vdc_options table), and resolved relative=
to ConfigValues.ConfigDir if possible. Following (default) values:
* UIPluginConfigPath =3D ui-plugins
* ConfigDir =3D /etc/ovirt-engine
result in UI plugin config path: /etc/ovirt-engine/ui-plugins
1. Processing UI plugin data on the server
PluginDataManager is the class responsible for reading, validating and cach=
ing UI plugin descriptor/configuration data on the server (Engine). It has =
two main responsibilities:
* return a snapshot of currently valid plugin data (getCurrentData meth=
od)
* reload plugin data from local file system if necessary (reloadData me=
thod)
The reloadData method doesn't modify "live" plugin data directly. Instead,
=
it creates a local working copy of current plugin data, updates this copy a=
s it reads/validates plugin descriptor and configuration files, and attempt=
s to update "live" plugin data through conditional reference re-assignment =
(using java.util.concurrent.atomic.AtomicReference.compareAndSet method).
In other words, reloadData method makes no attempts with regard to Java loc=
k-based synchronization, in favor of dealing with "live" data through Atomi=
cReference (reference that involves atomic volatile reads and writes):
* In the best case, a thread will succeed in updating "live" data (Atom=
icReference.compareAndSet =3D=3D true), which means that "live" data remain=
ed unchanged since this thread acquired a reference of current plugin data.
* In the worst case, a thread will NOT succeed in updating "live" data =
(AtomicReference.compareAndSet =3D=3D false), which means that "live" data =
was already changed by another thread since this thread acquired a referenc=
e of current plugin data.
In my opinion, when dealing with external resources like the local file sys=
tem, this is a good compromise between performance and up-to-date data. Whi=
le we might not get "completely-up-to-date" data at the given point in time=
(reloadData + getCurrentData), we are guaranteed to get "recently-up-to-da=
te" and consistent data. In other words, the requirement of "completely-up-=
to-date" data would involve synchronized statements that would hurt perform=
ance. 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, esp=
ecially in our case when the user can just hit refresh (F5) to reload WebAd=
min and its plugin data.
Plugin descriptor files are expected to be placed in UI plugin data path, f=
or example: /usr/share/ovirt-engine/ui-plugins/foo.json
Following descriptor file attributes are implemented and recognized by the =
plugin infrastructure:
* name: A name that uniquely identifies the plugin (required attribute)=
.
* url: URL of plugin host page that invokes the plugin code (required a=
ttribute).
* config: Default configuration object associated with the plugin (opti=
onal attribute).
* resourcePath: Path to plugin static resources, relative to UI plugin =
data path (optional attribute). This is used when serving plugin files thro=
ugh Engine PluginResourceServlet (more on this below).
Plugin configuration files are expected to be placed in UI plugin config pa=
th, for example: /etc/engine/ui-plugins/foo-config.json
Note that plugin configuration files follow the "<descriptorFileName>-confi=
g.json" convention.
Following configuration file attributes are implemented and recognized by t=
he plugin infrastructure:
* config: Custom configuration object associated with the plugin (optio=
nal attribute). This overrides the default plugin descriptor configuration,=
if any.
* enabled: Indicates whether the plugin should be loaded on WebAdmin st=
artup (optional attribute). Default value is 'true'.
* order: Defines the relative order in which the plugin will be loaded =
on WebAdmin startup (optional attribute). Default value is Integer.MAX_VALU=
E (lowest order).
The concept of merging custom configuration (config attribute in foo-config=
.json), if any, on top of default configuration (config attribute in foo.js=
on), if any, remains unchanged. This makes the plugin configuration quite f=
lexible - in my opinion, the added complexity of handling/merging such conf=
iguration is definitely worth the effort.
The enabled attribute is straight-forward, allowing users to turn the given=
plugin off, if necessary. In future, users should still be able to load su=
ch plugins through WebAdmin GUI.
The order attribute controls the order in which plugins are loaded on WebAd=
min startup. Since plugin resources are fetched asynchronously by the brows=
er, this is basically a way of imposing some degree of determinism in the "=
generally-non-deterministic" plugin environment, which is helpful when trou=
bleshooting problems with multiple plugins. This attribute is also helpful =
due to file listing methods in java.io.File giving no guarantees that files=
would be listed in any particular order (otherwise we could just go for th=
e "NN-<descriptorFileName>.json" convention, with NN being the order
number=
).
2. Modified behavior of WebadminDynamicHostingServlet
WebadminDynamicHostingServlet is the servlet used to serve WebAdmin applica=
tion host page (HTML page that bootstraps WebAdmin JavaScript code).
In addition to its former behavior, as part of handling the given request, =
WebadminDynamicHostingServlet:
* reloads descriptor/configuration data from local file system if neces=
sary, and obtains a snapshot of currently valid plugin data (PluginDataMana=
ger.reloadAndGetCurrentData)
* embeds all plugin meta-data, suitable for use in client-side plugin i=
nfrastructure, into WebAdmin host page as "pluginDefinitions" JavaScript ar=
ray (PluginDefinitions)
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).
3. Added servlet for serving plugin static resources
PluginResourceServlet is the servlet used to serve UI plugin static files (=
plugin host page, 3rd party JavaScript, etc.) from the local file system.
For example, requesting URL:
* http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/=
start.html<http://%3cEngineManagerHost%3e:8700/webadmin/webadmin/plugin/foo=
/content/start.html
will send the content of:
* /usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.html
to the client.
As shown in the above example:
* /webadmin/webadmin/plugin/ is the servlet root path for PluginResourc=
eServlet
* in the extra path beyond the servlet root path (/foo/content/start.ht=
ml):
* /foo represents the name of the plugin
* /content/start.html represents the path to requested resource, rel=
ative to "UIPluginDataPath / <resourcePath>"
Note that each plugin using PluginResourceServlet to serve its static files=
must declare non-empty resourcePath attribute in within the plugin descrip=
tor.
Also note that PluginResourceServlet, unlike WebadminDynamicHostingServlet,=
does NOT reload descriptor/configuration data from local file system as pa=
rt of handling the given request. In other words, it's assumed that plugin =
data has already been (re)loaded when serving WebAdmin application host pag=
e, with subsequent requests to PluginResourceServlet reading the current pl=
ugin information.
Until we solve the cross-origin issue in a clean way, PluginResourceServlet=
should be used to serve all plugin resources from local file system.
4. Plugin lifecycle improved to deal with misbehaving plugins
PluginState enum has been modified to deal with plugins that allow uncaught=
exceptions to escape from plugin event handler functions (e.g. "UiInit"):
* removed state INITIALIZED
* added state INITIALIZING: The plugin is (currently) being initialized=
by calling UiInit event handler function.
* added state IN_USE: Plugin's UiInit event handler function has comple=
ted successfully, we can now call other event handler functions as necessar=
y. The plugin is in use now.
* added state FAILED: An uncaught exception escaped while calling an ev=
ent handler function, which indicates internal error within the plugin code=
. The plugin is removed from service.
I've attached a simple state diagram that illustrates different states and =
transitions between them (green color is initial state, red color is end st=
ate).
Uncaught exceptions in plugin event handler functions will be caught and ha=
ndled 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.
Update on cross-origin issue (consequence of same-origin policy)
In order for the plugin to access WebAdmin plugin API, plugin host page (e.=
g. start.html) must be served from URL on same origin as Engine origin. Oth=
erwise, plugin code running in the context of an iframe'd host page will fa=
il to evaluate "parent.pluginApi" expression, with "parent" being
top-level=
(WebAdmin) window, and "pluginApi" being the global plugin API object expo=
sed by WebAdmin.
This is why PluginResourceServlet, available on Engine origin, should be us=
ed to serve all plugin resources from local file system.
There's only one issue that remains to be solved: cross-origin "plugin vs. =
remote service" communication, with "remote service" being anything other
t=
han Engine (REST API). In future, we'll address this with Apache reverse pr=
oxy configuration, so that users can configure Apache server (placed in fro=
nt of Engine JBoss AS) to put arbitrary (local or remote non-Engine) servic=
es on same origin. However, this requires a change in current Apache config=
uration. Until then, users can manually edit the Engine Apache configuratio=
n file (/etc/httpd/conf.d/ovirt-engine.conf).
________________________________
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 pa=
tch to oVirt Gerrit: http://gerrit.ovirt.org/8120
Let me know what you think!
Cheers,
Vojtech
<ui-plugin-sample-files.tar.gz <ui-plugin-lifecycle.png _______________________________________________
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</head <body bgcolor=3D"white"
lang=3D"EN-US" link=3D"blue" vlink=3D"purple" <div class=3D"WordSection1" <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Hi
Vojtech,<o:p></o:p></s=
pan></p <p
class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">The patch is great
and ha=
s 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 deliver=
ed. Thanks a lot for putting this all together. I do have a few questions a=
nd suggestions for you, though.<o:p></o:p></span></p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","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. Som=
e contexts would have several buttons,
such as a storage domain (provision, resize, dedupe management, destroy) s=
o 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 clutte=
red. 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=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">If needed we can
help wor=
k 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=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">For the reverse
proxy, wo=
uld it be easier from a customer standpoint to just include a reverse proxy=
servlet such as this one? </span><a
href=3D"http://sourceforge.net/p=
rojects/j2ep/">http://sourceforge.net/projects/j2ep/</a <o:p></o:p></p <p
class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">I’m just
thinking t=
hat setting up and managing a plugin for the HTTP server may be more comple=
x than including one internally that would be transparent to a
customer.<o:p></o:p></span></p <p
class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span>=
</p <p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Chris<o:p></o:p></span></=
p <blockquote
style=3D"margin-top:5.0pt;margin-bottom:5.0pt"
<div <p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><b>From:</b> Vojtech =
Szocs <<a
href=3D"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=3D"mailto:engine-devel@ovirt.org">engin=
e-devel(a)ovirt.org</a>&gt;<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=3D"margin-top:5.0pt;margin-bottom:5.0pt"
<div <div <p
class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"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 component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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 th=
e end of this message)<o:p></o:p></span></p <div class=3D"MsoNormal"
align=3D"center" style=3D"text-align:center"><span=
style=3D"color:black" <hr size=3D"2"
width=3D"100%" align=3D"center"
</span></div <p
class=3D"MsoNormal"><span style=3D"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.UIPluginDataP=
ath</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=3D"disc" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo1"
<i>UIPluginDataPath =3D
ui-plugins</i><o:p></o:p></li><li class=3D"MsoNorma=
l" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;=
mso-list:l0 level1 lfo1" <i>DataDir =3D
/usr/share/ovirt-engine</i><o:p></o:p></li></ul <p class=3D"MsoNormal"><span
style=3D"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.UIPluginConf=
igPath</i> enum option ("UIPluginConfigPath" in
<i>vdc_options</i> table), and resolved relative to
<i>ConfigValues.ConfigD=
ir</i> if possible. Following (default)
values:<o:p></o:p></span></p <ul
type=3D"disc" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l3 level1 lfo2"
<i>UIPluginConfigPath =3D
ui-plugins</i><o:p></o:p></li><li class=3D"MsoNor=
mal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:aut=
o;mso-list:l3 level1 lfo2" <i>ConfigDir =3D
/etc/ovirt-engine</i><o:p></o:p></li></ul <p><span style=3D"color:black">result in
UI plugin config path: <i>/etc/ovi=
rt-engine/ui-plugins</i><o:p></o:p></span></p <p class=3D"MsoNormal"><span
style=3D"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 a=
nd caching UI plugin descriptor/configuration data on the server (Engine). =
It has two main responsibilities:<o:p></o:p></span></p <ul type=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l2 level1 lfo3" return a
snapshot of currently valid plugin data (<i>getCurrentData</i> met=
hod)<o:p></o:p></li><li class=3D"MsoNormal"
style=3D"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> m=
ethod)<o:p></o:p></li></ul
<p><span style=3D"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-as=
signment (using <i
java.util.concurrent.atomic.AtomicReference.compareAndSet</i>
method).<o:p>=
</o:p></span></p <p><span
style=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">In other
words, <i>reloadData</i> method mak=
es 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> read=
s and writes):<o:p></o:p></span></p <ul
type=3D"disc" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l4 level1 lfo4" In the
best case, a thread will succeed in updating "live" data (=
<i>AtomicReference.compareAndSet</i> =3D=3D true), which means that
"l=
ive" data remained unchanged since this thread acquired a reference of=
current plugin data.<o:p></o:p></li><li
class=3D"MsoNormal" style=3D"color=
:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l4 level=
1 lfo4" In the worst case, a thread will NOT
succeed in updating "live" d=
ata (<i>AtomicReference.compareAndSet</i> =3D=3D false), which means that
&=
quot;live" data was already changed by another thread since this threa=
d acquired a reference of current plugin
data.<o:p></o:p></li></ul
<p><span style=3D"color:black">In my opinion, when dealing
with external re=
sources like the local file system, this is a good compromise between perfo=
rmance and up-to-date data. While we might not get "completely-up-to-d=
ate" data at the given point in time (<i>reloadData
+ getCurrentData</i>), we are guaranteed to get
"recently-up-to-d=
ate" and consistent data. In other words, the requirement of "com=
pletely-up-to-date" data would involve
<i>synchronized</i> statements that would hurt performance. In my (very hum=
ble) 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=3D"color:black"><o:p> </o:p></span></p <p><u><span
style=3D"color:black">Plugin descriptor files</span></u><span
s=
tyle=3D"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=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">Following
descriptor file attributes are imp=
lemented and recognized by the plugin
infrastructure:<o:p></o:p></span></p <ul
type=3D"disc" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-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=3D"MsoNormal"
style=3D"color:black;mso-margin-t=
op-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=3D"MsoNormal"
style=3D"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 (opt=
ional attribute).<o:p></o:p></li><li class=3D"MsoNormal"
style=3D"color:bla=
ck;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lf=
o5" <i>resourcePath</i>:
Path to plugin static resources, relative to UI plugin=
data path (optional attribute). This is used when serving plugin files thr=
ough Engine
<i>PluginResourceServlet</i> (more on this
below).<o:p></o:p></li></ul
<p><u><span style=3D"color:black">Plugin configuration
files</span></u><spa=
n style=3D"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=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">Note that
plugin configuration files follow =
the "<descriptorFileName>-config.json"
convention.<o:p></o:=
p></span></p <p><span
style=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">Following
configuration file attributes are =
implemented and recognized by the plugin
infrastructure:<o:p></o:p></span><=
/p <ul type=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l8 level1 lfo6"
<i>config</i>: Custom configuration object associated with the plugin
(opti=
onal attribute). This overrides the default plugin descriptor configuration=
, if any.<o:p></o:p></li><li class=3D"MsoNormal"
style=3D"color:black;mso-m=
argin-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 s=
tartup (optional attribute). Default value is
'true'.<o:p></o:p></li><li cl=
ass=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-margin-b=
ottom-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=3D"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 configur=
ation quite flexible - in my opinion, the added complexity of handling/merg=
ing such configuration is definitely worth the
effort.<o:p></o:p></span></p=
<p><span
style=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">The
<i>enabled</i> attribute is straight-for=
ward, 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=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">The
<i>order</i> attribute controls the orde=
r in which plugins are loaded on WebAdmin startup. Since plugin resources a=
re fetched asynchronously by the browser, this is basically a way of imposi=
ng some degree of determinism in the
"generally-non-deterministic" plugin environment, which is helpf=
ul when troubleshooting problems with multiple plugins. This attribute is a=
lso 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-<descripto=
rFileName>.json" convention, with NN being the order
number).<o:p><=
/o:p></span></p <p
class=3D"MsoNormal"><span style=3D"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=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-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=3D"MsoNormal" style=
=3D"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 infrast=
ructure, into WebAdmin host page as "pluginDefinitions" JavaScrip=
t array
(<i>PluginDefinitions</i>)<o:p></o:p></li></ul <p class=3D"MsoNormal"><span
style=3D"color:black">As a result, reloading U=
I plugin descriptor/configuration data is as simple as refreshing (F5) WebA=
dmin 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 sy=
stem.<br <br For
example, requesting URL:<o:p></o:p></span></p <ul type=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l5 level1 lfo8"
<i><a
href=3D"http://%3cEngineManagerHost%3e:8700/webadmin/webadmin/plugin/=
foo/content/start.html">http://<EngineManagerHost>:8700/webadmin/weba=
dmin/plugin/foo/content/start.html</a></i><o:p></o:p></li></ul <p><span style=3D"color:black">will send
the content of:<o:p></o:p></span><=
/p <ul type=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level1 lfo9"
<i>/usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.ht=
ml</i><o:p></o:p></li></ul
<p><span style=3D"color:black">to the
client.<o:p></o:p></span></p
<p><span
style=3D"color:black"><o:p> </o:p></span></p <p><span style=3D"color:black">As shown
in the above example:<o:p></o:p></s=
pan></p <ul type=3D"disc" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l10 level1 lfo10"
<i>/webadmin/webadmin/plugin/</i> is the servlet root path for
<i>PluginRes=
ourceServlet</i><o:p></o:p></li><li
class=3D"MsoNormal" style=3D"color:blac=
k;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level1 lf=
o10" in the extra path beyond the servlet
root path (<i>/foo/content/start.html<=
/i>):<o:p></o:p></li></ul <ul
type=3D"disc" <ul type=3D"circle" <li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l10 level2 lfo10"
<i>/foo</i> represents the name of the
plugin<o:p></o:p></li><li class=3D"M=
soNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;mso-list:l10 level2 lfo10"
<i>/content/start.html</i> represents the path to requested resource,
relat=
ive to "UIPluginDataPath /
<resourcePath>"<o:p></o:p></li><=
/ul </ul <p
class=3D"MsoNormal"><span style=3D"color:black">Note that
each plugin us=
ing <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>WebadminDynamicHosti=
ngServlet</i>, does NOT reload descriptor/configuration data from local fil=
e system as part of handling the given request. In other words, it's assume=
d that plugin data has already been
(re)loaded when serving WebAdmin application host page, with subsequent re=
quests to
<i>PluginResourceServlet</i> reading the current plugin information.<br <br Until we solve the cross-origin
issue in a clean way, <i>PluginResourceServ=
let</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 u=
ncaught exceptions to escape from plugin event handler functions (e.g. &quo=
t;UiInit"):<o:p></o:p></span></p <ul type=3D"disc" <li
class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l6 level1 lfo11" removed
state <i>INITIALIZED</i><o:p></o:p></li><li
class=3D"MsoNormal" sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l6 level1 lfo11" added state
<i>INITIALIZING</i>: The plugin is (currently) being initialize=
d by calling UiInit event handler function.<o:p></o:p></li><li
class=3D"Mso=
Normal" style=3D"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 compl=
eted successfully, we can now call other event handler functions as necessa=
ry. The plugin is in use now.<o:p></o:p></li><li
class=3D"MsoNormal" style=
=3D"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 e=
vent handler function, which indicates internal error within the plugin cod=
e. The plugin is removed from service.<o:p></o:p></li></ul <p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">I've attached a simple state diagram that illustrates different stat=
es 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 ha=
ndled 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. Ot=
herwise, plugin code running in the context of an iframe'd host page will f=
ail to evaluate "parent.pluginApi" expression, with
"parent&=
quot; 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, shoul=
d 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" be=
ing anything other than Engine (REST API). In future, we'll address this wi=
th Apache reverse proxy configuration, so that users
can configure Apache server (placed in front of Engine JBoss AS) to put ar=
bitrary (local or remote non-Engine) services on same origin. However, this=
requires a change in current Apache configuration. Until then, users can m=
anually edit the Engine Apache configuration
file
(<i>/etc/httpd/conf.d/ovirt-engine.conf</i>).<o:p></o:p></span></p <div class=3D"MsoNormal"
align=3D"center" style=3D"text-align:center"><span=
style=3D"color:black" <hr size=3D"2"
width=3D"100%" align=3D"center"
</span></div <p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><span style=3D"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 pa=
tch to oVirt Gerrit:
<a
href=3D"http://gerrit.ovirt.org/8120">http://gerrit.ovirt.or...
r <br Let me know what you
think!<br <br
Cheers,<br
Vojtech<o:p></o:p></span></p
</div </div </blockquote
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" <div <p
class=3D"MsoNormal"><ui-plugin-sample-files.tar.gz><o:p></o:p></p </div
</blockquote <blockquote
style=3D"margin-top:5.0pt;margin-bottom:5.0pt"
<div <p
class=3D"MsoNormal"><ui-plugin-lifecycle.png><o:p></o:p></p </div
</blockquote <blockquote
style=3D"margin-top:5.0pt;margin-bottom:5.0pt"
<div <p
class=3D"MsoNormal">_______________________________________________<br Engine-devel mailing list<br <a
href=3D"mailto:Engine-devel@ovirt.org">Engine-devel@ovirt.org</a><br <a
href=3D"http://lists.ovirt.org/mailman/listinfo/engine-devel"&g...
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--_000_D290AD8432118048947689BA3AE8A9B3E47B82SACEXCMBX04PRDhqn_--
1:46 p.m.
New subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here
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Hi Chris,=20
many thanks for your feedback and suggestions :)=20
Adding context-sensitive button with corresponding menu item sounds good! I=
n fact, this is the proper way how context menu items should be handled, si=
nce WebAdmin data grids work with context-sensitive "action buttons" which =
are reflected within the context menu. I agree that this is a very useful f=
eature to have in plugin API, it should be implemented as part of next majo=
r PoC revision.=20
I have a question though: when the user clicks the custom button or corresp=
onding context menu item, will your plugin handle common dialog UI (everyth=
ing except actual content) on its own, or do you prefer to have some kind o=
f "dialog UI" API to create the standard-looking dialog frame for you? I li=
ke the idea of using iframe to present custom content though :)=20
As for grouping multiple context-sensitive buttons and corresponding contex=
t menu items, this makes sense and we have something like this already impl=
emented in WebAdmin (in Host main tab, Power Management drop-down group but=
ton, but this is defined not to appear in context menu though). I think thi=
s should be part of "custom context-sensitive button / menu item" plugin AP=
I feature.=20
If needed we can help work on an implementation for the dialog popup
plug=
in framework as we=E2=80=99d like to get it in relatively quickly so we can=
move forward on the content side of our plugin.=20
If I understand correctly, this is about providing "dialog UI" API to creat=
e the standard-looking dialog frame + custom content iframe. I'd like to he=
lp with this as well, but you can play with the code and propose a patch on=
top of PoC rev.5 [http://gerrit.ovirt.org/8120].=20
For the reverse proxy, would it be easier from a customer standpoint
to j=
ust include a reverse proxy servlet such as this one?=20
Actually, I was under the impression that oVirt Engine (3.1) package (ovirt=
-engine) takes care of setting up Apache web server, which redirects all tr=
affic to Engine JBoss AS by default (but maybe I am wrong here). However, i=
f this is the case, an efficient way to work around same-origin policy (cro=
ss-origin issues) is to configure Apache's reverese proxy module (mod_proxy=
), as discussed in another thread on engine-devel: http://lists.ovirt.org/p=
ipermail/engine-devel/2012-September/002511.html=20
This way, you could use Apache to bring Engine and arbitrary (local or remo=
te) web services on same origin. What do you think?=20
On the other hand, using a special-purpose reverse proxy servlet directly i=
n Engine, not sure if that's a good idea though.. (I'd prefer configuring "=
front-end" web server, such as Apache, for this purpose)=20
I'm also sending a couple of updates:=20
UI Plugins Follow-Up Meeting: scheduled for Tuesday, October 9 at 4pm GMT+1=
(I'll send a meeting invitation soon, also planning to re-write oVirt UI P=
lugins wiki soon after that)=20
PoC rev.5 patch update: many thanks to Juan and Doron for reviewing the rec=
ent patch [http://gerrit.ovirt.org/8120]! I'll update the patch accordingly=
as revision 5.1=20
Planned items to be included in PoC revision 6:=20
* adding custom context-sensitive button (either separately or within a=
button group), along with corresponding context menu item representation=
=20
* update custom main tab to show the actual content (iframe) from the g=
iven URL=20
* adding custom sub tab that shows content from the given URL=20
More items to consider having in PoC revision 6:=20
* "dialog UI" API to create the standard-looking dialog frame + custom =
content iframe=20
* Engine REST API exposed through plugin API=20
* integration with Tasks pane to provide visual feedback on custom oper=
ations=20
* extending existing dialogs (e.g. Edit Cluster Policy - custom propert=
ies)=20
Let me know what you think.=20
Regards,=20
Vojtech=20
----- Original Message -----
From: "Christopher Morrissey" <Christopher.Morrissey(a)netapp.com>=20
To: vszocs(a)redhat.com=20
Cc: "George Costea" <George.Costea(a)netapp.com>, "Dustin
Schoenbrun" <Dustin=
.Schoenbrun(a)netapp.com>, engine-devel(a)ovirt.org=20
Sent: Tuesday, October 2, 2012 6:15:34 PM=20
Subject: RE: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
Hi Vojtech,=20
The patch is great and has cleared up some questions I had about the implem=
entation. I=E2=80=99ve been able to get the sample plugins working and wade=
d through the code changes, so feel like I have a good understanding of wha=
t was delivered. Thanks a lot for putting this all together. I do have a fe=
w questions and suggestions for you, though.=20
Will there eventually be a way to add one or more buttons to the context se=
nsitive buttons and menus throughout the interface? For example, we=E2=80=
=99d like to allow a button to provision a datastore when a data center, cl=
uster, or host is selected. When the button is clicked, it would open a dia=
log with an iframe in which we would load our interface to perform the asso=
ciated 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=E2=80=99t get too cluttered. We=E2=80=99d=
also like to add these same actions to the menus that popup when a context=
ual object is right clicked.=20
If needed we can help work on an implementation for the dialog popup plugin=
framework as we=E2=80=99d like to get it in relatively quickly so we can m=
ove forward on the content side of our plugin.=20
For the reverse proxy, would it be easier from a customer standpoint to jus=
t include a reverse proxy servlet such as this one? http://sourceforge.net/=
projects/j2ep/=20
I=E2=80=99m just thinking that setting up and managing a plugin for the HTT=
P server may be more complex than including one internally that would be tr=
ansparent to a customer.=20
Thanks,=20
Chris=20
From: Vojtech Szocs < vszocs(a)redhat.com >=20
Date: September 21, 2012 4:37:31 PM EDT=20
To: engine-devel < engine-devel(a)ovirt.org >=20
Subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
<blockquote>
Hi guys,=20
it's been a while but here comes the latest revision of UI Plugins proof-of=
-concept patch (please find it attached).=20
This revision was originally meant to focus solely on server-side component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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.=20
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!=20
So here we go... (or if you just want to get the patch, find the link at th=
e end of this message)=20
0. Added new Engine configuration values=20
UI plugin data path is represented by ConfigValues.UIPluginDataPath enum op=
tion ("UIPluginDataPath" in vdc_options table), and resolved relative to Co=
nfigValues.DataDir if possible. Following (default) values:=20
* UIPluginDataPath =3D ui-plugins=20
* DataDir =3D /usr/share/ovirt-engine=20
result in UI plugin data path: /usr/share/ovirt-engine/ui-plugins=20
UI plugin config path is represented by ConfigValues.UIPluginConfigPath enu=
m option ("UIPluginConfigPath" in vdc_options table), and resolved relative=
to ConfigValues.ConfigDir if possible. Following (default) values:=20
* UIPluginConfigPath =3D ui-plugins=20
* ConfigDir =3D /etc/ovirt-engine=20
result in UI plugin config path: /etc/ovirt-engine/ui-plugins=20
1. Processing UI plugin data on the server=20
PluginDataManager is the class responsible for reading, validating and cach=
ing UI plugin descriptor/configuration data on the server (Engine). It has =
two main responsibilities:=20
* return a snapshot of currently valid plugin data ( getCurrentData met=
hod)=20
* reload plugin data from local file system if necessary ( reloadData m=
ethod)=20
The reloadData method doesn't modify "live" plugin data directly. Instead,
=
it creates a local working copy of current plugin data, updates this copy a=
s it reads/validates plugin descriptor and configuration files, and attempt=
s to update "live" plugin data through conditional reference re-assignment =
(using java.util.concurrent.atomic.AtomicReference.compareAndSet method).=
=20
In other words, reloadData method makes no attempts with regard to Java loc=
k-based synchronization, in favor of dealing with "live" data through Atomi=
cReference (reference that involves atomic volatile reads and writes):=20
* In the best case, a thread will succeed in updating "live" data ( Ato=
micReference.compareAndSet =3D=3D true), which means that "live" data remai=
ned unchanged since this thread acquired a reference of current plugin data=
.=20
* In the worst case, a thread will NOT succeed in updating "live" data =
( AtomicReference.compareAndSet =3D=3D false), which means that "live" data=
was already changed by another thread since this thread acquired a referen=
ce of current plugin data.=20
In my opinion, when dealing with external resources like the local file sys=
tem, this is a good compromise between performance and up-to-date data. Whi=
le we might not get "completely-up-to-date" data at the given point in time=
( reloadData + getCurrentData ), we are guaranteed to get "recently-up-to-=
date" and consistent data. In other words, the requirement of "completely-u=
p-to-date" data would involve synchronized statements that would hurt perfo=
rmance. In my (very humble) opinion, the benefit of having "completely-up-t=
o-date" data, at the cost of reduced performance, is not really worth it, e=
specially in our case when the user can just hit refresh (F5) to reload Web=
Admin and its plugin data.=20
Plugin descriptor files are expected to be placed in UI plugin data path, f=
or example: /usr/share/ovirt-engine/ui-plugins/foo.json=20
Following descriptor file attributes are implemented and recognized by the =
plugin infrastructure:=20
* name : A name that uniquely identifies the plugin (required attribute=
).=20
* url : URL of plugin host page that invokes the plugin code (required =
attribute).=20
* config : Default configuration object associated with the plugin (opt=
ional attribute).=20
* resourcePath : Path to plugin static resources, relative to UI plugin=
data path (optional attribute). This is used when serving plugin files thr=
ough Engine PluginResourceServlet (more on this below).=20
Plugin configuration files are expected to be placed in UI plugin config pa=
th, for example: /etc/engine/ui-plugins/foo-config.json=20
Note that plugin configuration files follow the "<descriptorFileName>-confi=
g.json" convention.=20
Following configuration file attributes are implemented and recognized by t=
he plugin infrastructure:=20
* config : Custom configuration object associated with the plugin (opti=
onal attribute). This overrides the default plugin descriptor configuration=
, if any.=20
* enabled : Indicates whether the plugin should be loaded on WebAdmin s=
tartup (optional attribute). Default value is 'true'.=20
* order : Defines the relative order in which the plugin will be loaded=
on WebAdmin startup (optional attribute). Default value is Integer.MAX_VAL=
UE (lowest order).=20
The concept of merging custom configuration ( config attribute in foo-confi=
g.json ), if any, on top of default configuration ( config attribute in foo=
.json ), if any, remains unchanged. This makes the plugin configuration qui=
te flexible - in my opinion, the added complexity of handling/merging such =
configuration is definitely worth the effort.=20
The enabled attribute is straight-forward, allowing users to turn the given=
plugin off, if necessary. In future, users should still be able to load su=
ch plugins through WebAdmin GUI.=20
The order attribute controls the order in which plugins are loaded on WebAd=
min startup. Since plugin resources are fetched asynchronously by the brows=
er, this is basically a way of imposing some degree of determinism in the "=
generally-non-deterministic" plugin environment, which is helpful when trou=
bleshooting problems with multiple plugins. This attribute is also helpful =
due to file listing methods in java.io.File giving no guarantees that files=
would be listed in any particular order (otherwise we could just go for th=
e "NN-<descriptorFileName>.json" convention, with NN being the order
number=
).=20
2. Modified behavior of WebadminDynamicHostingServlet=20
WebadminDynamicHostingServlet is the servlet used to serve WebAdmin applica=
tion host page (HTML page that bootstraps WebAdmin JavaScript code).=20
In addition to its former behavior, as part of handling the given request, =
WebadminDynamicHostingServlet :=20
* reloads descriptor/configuration data from local file system if neces=
sary, and obtains a snapshot of currently valid plugin data ( PluginDataMan=
ager.reloadAndGetCurrentData )=20
* embeds all plugin meta-data, suitable for use in client-side plugin i=
nfrastructure, into WebAdmin host page as "pluginDefinitions" JavaScript ar=
ray ( PluginDefinitions )=20
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).=20
3. Added servlet for serving plugin static resources=20
PluginResourceServlet is the servlet used to serve UI plugin static files (=
plugin host page, 3rd party JavaScript, etc.) from the local file system.=
=20
For example, requesting URL:=20
* http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/=
start.html=20
will send the content of:=20
* /usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.html=
=20
to the client.=20
As shown in the above example:=20
* /webadmin/webadmin/plugin/ is the servlet root path for PluginResourc=
eServlet=20
* in the extra path beyond the servlet root path ( /foo/content/start.h=
tml ):=20
* /foo represents the name of the plugin=20
* /content/start.html represents the path to requested resource, re=
lative to "UIPluginDataPath / <resourcePath>"=20
Note that each plugin using PluginResourceServlet to serve its static files=
must declare non-empty resourcePath attribute in within the plugin descrip=
tor.=20
Also note that PluginResourceServlet , unlike WebadminDynamicHostingServlet=
, does NOT reload descriptor/configuration data from local file system as =
part of handling the given request. In other words, it's assumed that plugi=
n data has already been (re)loaded when serving WebAdmin application host p=
age, with subsequent requests to PluginResourceServlet reading the current =
plugin information.=20
Until we solve the cross-origin issue in a clean way, PluginResourceServlet=
should be used to serve all plugin resources from local file system.=20
4. Plugin lifecycle improved to deal with misbehaving plugins=20
PluginState enum has been modified to deal with plugins that allow uncaught=
exceptions to escape from plugin event handler functions (e.g. "UiInit"):=
=20
* removed state INITIALIZED=20
* added state INITIALIZING : The plugin is (currently) being initialize=
d by calling UiInit event handler function.=20
* added state IN_USE : Plugin's UiInit event handler function has compl=
eted successfully, we can now call other event handler functions as necessa=
ry. The plugin is in use now.=20
* added state FAILED : An uncaught exception escaped while calling an e=
vent handler function, which indicates internal error within the plugin cod=
e. The plugin is removed from service.=20
I've attached a simple state diagram that illustrates different states and =
transitions between them (green color is initial state, red color is end st=
ate).=20
Uncaught exceptions in plugin event handler functions will be caught and ha=
ndled 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.=
=20
Update on cross-origin issue (consequence of same-origin policy)=20
In order for the plugin to access WebAdmin plugin API, plugin host page (e.=
g. start.html ) must be served from URL on same origin as Engine origin. Ot=
herwise, plugin code running in the context of an iframe'd host page will f=
ail to evaluate "parent.pluginApi" expression, with "parent" being
top-leve=
l (WebAdmin) window, and "pluginApi" being the global plugin API object exp=
osed by WebAdmin.=20
This is why PluginResourceServlet , available on Engine origin, should be u=
sed to serve all plugin resources from local file system.=20
There's only one issue that remains to be solved: cross-origin "plugin vs. =
remote service" communication, with "remote service" being anything other
t=
han Engine (REST API). In future, we'll address this with Apache reverse pr=
oxy configuration, so that users can configure Apache server (placed in fro=
nt of Engine JBoss AS) to put arbitrary (local or remote non-Engine) servic=
es on same origin. However, this requires a change in current Apache config=
uration. Until then, users can manually edit the Engine Apache configuratio=
n file ( /etc/httpd/conf.d/ovirt-engine.conf ).=20
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 pa=
tch to oVirt Gerrit: http://gerrit.ovirt.org/8120=20
Let me know what you think!=20
Cheers,=20
Vojtech=20
</blockquote>
<blockquote>
<ui-plugin-sample-files.tar.gz>=20
</blockquote>
<blockquote>
<ui-plugin-lifecycle.png>=20
</blockquote>
<blockquote>
_______________________________________________=20
Engine-devel mailing list=20
Engine-devel(a)ovirt.org=20
http://lists.ovirt.org/mailman/listinfo/engine-devel=20
</blockquote>
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Content-Transfer-Encoding: quoted-printable
<html><head><style type=3D'text/css'>p { margin: 0;
}</style></head><body><=
div style=3D'font-family: times new roman,new york,times,serif; font-size: =
12pt; color: #000000'>Hi Chris,<br><br>many thanks for your feedback
and su=
ggestions :)<br><br>Adding context-sensitive button with corresponding menu=
item sounds good! In fact, this is the proper way how context menu items s=
hould be handled, since WebAdmin data grids work with context-sensitive "ac=
tion buttons" which are reflected within the context menu. I agree that thi=
s is a very useful feature to have in plugin API, it should be implemented =
as part of next major PoC revision.<br><br>I have a question though: when t=
he user clicks the custom button or corresponding context menu item, will y=
our plugin handle common dialog UI (everything except actual content) on it=
s own, or do you prefer to have some kind of "dialog UI" API to create the =
standard-looking dialog frame for you? I like the idea of using iframe to p=
resent custom content though :)<br><br>As for grouping multiple context-sen=
sitive buttons and corresponding context menu items, this makes sense and w=
e have something like this already implemented in WebAdmin (in Host main ta=
b, Power Management drop-down group button, but this is defined not to appe=
ar in context menu though). I think this should be part of "custom context-=
sensitive button / menu item" plugin API feature.<br><br>>
<span style=
=3D"font-size:11.0pt;font-family:"Calibri","sans-serif"=
;color:#1F497D">If
needed we can help work on an implementation for the dialog popup=20
plugin framework as we=E2=80=99d like to get it in relatively quickly so we=
can=20
move forward on
the content side of our plugin.</span><br><br>If I understand
correctly, t=
his is about providing "dialog UI" API to create the standard-looking dialo=
g frame + custom content iframe. I'd like to help with this as well, =
but you can play with the code and propose a patch on top of PoC rev.5 [htt=
p://gerrit.ovirt.org/8120].<br><br>> <span
style=3D"font-size:11.0pt;fon=
t-family:"Calibri","sans-serif";color:#1F497D">For
the =
reverse proxy, would it be easier from a customer standpoint to just includ=
e a reverse proxy servlet such as this one?<br></span><br>Actually, I
was u=
nder the impression that oVirt Engine (3.1) package (ovirt-engine) takes ca=
re of setting up Apache web server, which redirects all traffic to Engine J=
Boss AS by default (but maybe I am wrong here). However, if this is the cas=
e, an efficient way to work around same-origin policy (cross-origin issues)=
is to configure Apache's reverese proxy module (mod_proxy), as discussed i=
n another thread on engine-devel: http://lists.ovirt.org/pipermail/engine-d=
evel/2012-September/002511.html<br><br>This way, you could use Apache to br=
ing Engine and arbitrary (local or remote) web services on same origin. Wha=
t do you think?<br><br>On the other hand, using a special-purpose reverse p=
roxy servlet directly in Engine, not sure if that's a good idea though.. (I=
'd prefer configuring "front-end" web server, such as Apache, for this
purp=
ose)<br><br>I'm also sending a couple of
updates:<br><br><strong>UI Plugins=
Follow-Up Meeting:</strong> scheduled for Tuesday, October 9 at 4pm GMT+1 =
(I'll send a meeting invitation soon, also planning to re-write oVirt UI Pl=
ugins wiki soon after that)<br><br><span style=3D"font-weight:
bold;">PoC r=
ev.5 patch update:</span> many thanks to Juan and Doron for reviewing the r=
ecent patch [http://gerrit.ovirt.org/8120]! I'll update the patch according=
ly as revision 5.1<br><br><span style=3D"font-weight:
bold;">Planned items =
to be included in PoC revision 6:</span><br><ul><li>adding custom
context-s=
ensitive button (either separately or within a button group), along with co=
rresponding context menu item representation</li><li>update custom main tab=
to show the actual content (iframe) from the given URL</li><li>adding cust=
om sub tab that shows content from the given
URL</li></ul><p><br></p><p><sp=
an style=3D"font-weight: bold;">More items to consider having in PoC revisi=
on 6:</span><br></p><ul><li>"dialog UI" API to
create the standard-looking =
dialog frame + custom content iframe</li><li>Engine REST API exposed throug=
h plugin API</li><li>integration with Tasks pane to provide visual feedback=
on custom operations</li><li>extending existing dialogs (e.g. Edit Cluster=
Policy - custom
properties)<br></li></ul><p><br></p><p>Let me
know what yo=
u
think.<br></p><p><br></p><p></p>Regards,<br>Vojtech<br><br><br><hr
id=3D"=
zwchr"><div
style=3D"color:#000;font-weight:normal;font-style:normal;text-d=
ecoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>F=
rom: </b>"Christopher Morrissey"
&lt;Christopher.Morrissey(a)netapp.com&gt;<b=
r><b>To: </b>vszocs(a)redhat.com<br><b>Cc: </b>"George
Costea" <George.Cos=
tea(a)netapp.com&gt;, "Dustin Schoenbrun"
&lt;Dustin.Schoenbrun(a)netapp.com&gt=
;, engine-devel(a)ovirt.org<br><b>Sent: </b>Tuesday, October 2, 2012
6:15:34 =
PM<br><b>Subject: </b>RE: [Engine-devel] UI Plugins: PoC patch revision
5 i=
s here<br><br>
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--></style>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Hi
Vojtech,</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">The patch is great
and ha=
s cleared up some questions I had about the implementation. I=E2=80=99ve be=
en able to get the sample plugins working and waded through the
code changes, so feel like I have a good understanding of what was deliver=
ed. Thanks a lot for putting this all together. I do have a few questions a=
nd suggestions for you, though.</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","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=E2=80=99d 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. Som=
e contexts would have several buttons,
such as a storage domain (provision, resize, dedupe management, destroy) s=
o 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=E2=80=99t get too clut=
tered. We=E2=80=99d also like to add these same
actions to the menus that popup when a contextual object is right clicked.=
</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">If needed we can
help wor=
k on an implementation for the dialog popup plugin framework as we=E2=80=99=
d like to get it in relatively quickly so we can move forward on
the content side of our plugin.</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">For the reverse
proxy, wo=
uld it be easier from a customer standpoint to just include a reverse proxy=
servlet such as this one? </span><a
href=3D"http://sourceforge.net/p=
rojects/j2ep/"
target=3D"_blank">http://sourceforge.net/projects/j2ep/</...
</p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">I=E2=80=99m just
thinking=
that setting up and managing a plugin for the HTTP server may be more comp=
lex than including one internally that would be transparent to a
customer.</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thanks,</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Chris</span></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><b>From:</b> Vojtech =
Szocs <<a href=3D"mailto:vszocs@redhat.com"
target=3D"_blank">vszocs@red=
hat.com</a>><br>
<b>Date:</b> September 21, 2012 4:37:31 PM EDT<br>
<b>To:</b> engine-devel <<a
href=3D"mailto:engine-devel@ovirt.org" targe=
t=3D"_blank">engine-devel(a)ovirt.org</a>&gt;<br>
<b>Subject:</b> <b>[Engine-devel] UI Plugins: PoC patch revision 5 is
here<=
/b></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"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 component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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 th=
e end of this message)</span></p>
<div class=3D"MsoNormal" style=3D"text-align:center"
align=3D"center"><span=
style=3D"color:black">
<hr align=3D"center" size=3D"2" width=3D"100%">
</span></div>
<p class=3D"MsoNormal"><span
style=3D"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.UIPluginDataP=
ath</em> enum option ("UIPluginDataPath" in
<i>vdc_options</i> table), and resolved relative to
<i>ConfigValues.DataDir=
</i> if possible. Following (default) values:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i>UIPluginDataPath =3D ui-plugins</i></li><li
class=3D"MsoNormal" style=3D=
"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0=
level1 lfo1">
<i>DataDir =3D /usr/share/ovirt-engine</i></li></ul>
<p class=3D"MsoNormal"><span style=3D"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.UIPluginConf=
igPath</i> enum option ("UIPluginConfigPath" in
<i>vdc_options</i> table), and resolved relative to
<i>ConfigValues.ConfigD=
ir</i> if possible. Following (default) values:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l3 level1 lfo2">
<i>UIPluginConfigPath =3D ui-plugins</i></li><li
class=3D"MsoNormal" style=
=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list=
:l3 level1 lfo2">
<i>ConfigDir =3D /etc/ovirt-engine</i></li></ul>
<p><span style=3D"color:black">result in UI plugin config path:
<i>/etc/ovi=
rt-engine/ui-plugins</i></span></p>
<p class=3D"MsoNormal"><span
style=3D"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 a=
nd caching UI plugin descriptor/configuration data on the server (Engine). =
It has two main responsibilities:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l2 level1 lfo3">
return a snapshot of currently valid plugin data (<i>getCurrentData</i> met=
hod)</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo3">
reload plugin data from local file system if necessary (<i>reloadData</i> m=
ethod)</li></ul>
<p><span style=3D"color:black">The <i>reloadData</i>
method doesn't modify =
"live" plugin data directly. Instead, it creates a local working copy of cu=
rrent plugin data, updates this copy as it reads/validates plugin descripto=
r 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).</spa=
n></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">In other words,
<i>reloadData</i> method mak=
es 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> read=
s and writes):</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l4 level1 lfo4">
In the best case, a thread will succeed in updating "live" data
(<i>AtomicR=
eference.compareAndSet</i> =3D=3D true), which means that "live" data
remai=
ned unchanged since this thread acquired a reference of current plugin data=
.</li><li class=3D"MsoNormal"
style=3D"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>At=
omicReference.compareAndSet</i> =3D=3D false), which means that "live"
data=
was already changed by another thread since this thread acquired a referen=
ce of current plugin data.</li></ul>
<p><span style=3D"color:black">In my opinion, when dealing with
external re=
sources like the local file system, this is a good compromise between perfo=
rmance 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 hum=
ble) opinion, the benefit of having "completely-up-to-date" data, at the co=
st of reduced performance, is not really worth it, especially in our case w=
hen the user can just hit refresh
(F5) to reload WebAdmin and its plugin data.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><u><span style=3D"color:black">Plugin descriptor
files</span></u><span s=
tyle=3D"color:black"> are expected to be placed in UI plugin data path, for=
example:
<i>/usr/share/ovirt-engine/ui-plugins/foo.json</i></span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Following descriptor file attributes
are imp=
lemented and recognized by the plugin infrastructure:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l9 level1 lfo5">
<i>name</i>: A name that uniquely identifies the plugin (required attribute=
).</li><li class=3D"MsoNormal"
style=3D"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).</li><li class=3D"MsoNormal"
style=3D"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 (opt=
ional attribute).</li><li class=3D"MsoNormal"
style=3D"color:black;mso-marg=
in-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 thr=
ough Engine
<i>PluginResourceServlet</i> (more on this below).</li></ul>
<p><u><span style=3D"color:black">Plugin configuration
files</span></u><spa=
n style=3D"color:black"> are expected to be placed in UI plugin config path=
, for example:
<i>/etc/engine/ui-plugins/foo-config.json</i></span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Note that plugin configuration files
follow =
the "<descriptorFileName>-config.json"
convention.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Following configuration file
attributes are =
implemented and recognized by the plugin infrastructure:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l8 level1 lfo6">
<i>config</i>: Custom configuration object associated with the plugin (opti=
onal attribute). This overrides the default plugin descriptor configuration=
, if any.</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 lfo6">
<i>enabled</i>: Indicates whether the plugin should be loaded on WebAdmin s=
tartup (optional attribute). Default value is 'true'.</li><li
class=3D"MsoN=
ormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:a=
uto;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).</li></ul>
<p><span style=3D"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 configur=
ation quite flexible - in my opinion, the added complexity of handling/merg=
ing such configuration is definitely worth the effort.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">The <i>enabled</i>
attribute is straight-for=
ward, allowing users to turn the given plugin off, if necessary. In future,=
users should still be able to load such plugins through WebAdmin GUI.</spa=
n></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">The <i>order</i>
attribute controls the orde=
r in which plugins are loaded on WebAdmin startup. Since plugin resources a=
re fetched asynchronously by the browser, this is basically a way of imposi=
ng some degree of determinism in the
"generally-non-deterministic" plugin environment, which is helpful when tr=
oubleshooting problems with multiple plugins. This attribute is also helpfu=
l 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-<descriptorFile=
Name>.json" convention, with NN being the order
number).</span></p>
<p class=3D"MsoNormal"><span
style=3D"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>:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-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>)</li><li class=3D"MsoNormal"
style=3D"color:bl=
ack;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l7 level1 l=
fo7">
embeds all plugin meta-data, suitable for use in client-side plugin infrast=
ructure, into WebAdmin host page as "pluginDefinitions" JavaScript array (<=
i>PluginDefinitions</i>)</li></ul>
<p class=3D"MsoNormal"><span style=3D"color:black">As a
result, reloading U=
I plugin descriptor/configuration data is as simple as refreshing (F5) WebA=
dmin 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 sy=
stem.<br>
<br>
For example, requesting URL:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l5 level1 lfo8">
<i><a>http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/co=
ntent/start.html</a></i></li></ul>
<p><span style=3D"color:black">will send the content
of:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level1 lfo9">
<i>/usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.ht=
ml</i></li></ul>
<p><span style=3D"color:black">to the
client.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">As shown in the above
example:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l10 level1 lfo10">
<i>/webadmin/webadmin/plugin/</i> is the servlet root path for
<i>PluginRes=
ourceServlet</i></li><li class=3D"MsoNormal"
style=3D"color:black;mso-margi=
n-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>):</li></ul>
<ul type=3D"disc">
<ul type=3D"circle">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l10 level2 lfo10">
<i>/foo</i> represents the name of the plugin</li><li
class=3D"MsoNormal" s=
tyle=3D"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, relat=
ive to "UIPluginDataPath / <resourcePath>"</li></ul>
</ul>
<p class=3D"MsoNormal"><span style=3D"color:black">Note
that each plugin us=
ing <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>WebadminDynamicHosti=
ngServlet</i>, does NOT reload descriptor/configuration data from local fil=
e system as part of handling the given request. In other words, it's assume=
d that plugin data has already been
(re)loaded when serving WebAdmin application host page, with subsequent re=
quests to
<i>PluginResourceServlet</i> reading the current plugin
information.<br>
<br>
Until we solve the cross-origin issue in a clean way, <i>PluginResourceServ=
let</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 u=
ncaught exceptions to escape from plugin event handler functions (e.g. "UiI=
nit"):</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l6 level1 lfo11">
removed state <i>INITIALIZED</i></li><li
class=3D"MsoNormal" style=3D"color=
:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level=
1 lfo11">
added state <i>INITIALIZING</i>: The plugin is (currently) being initialize=
d by calling UiInit event handler function.</li><li class=3D"MsoNormal"
sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l6 level1 lfo11">
added state <i>IN_USE</i>: Plugin's UiInit event handler function has
compl=
eted successfully, we can now call other event handler functions as necessa=
ry. The plugin is in use now.</li><li class=3D"MsoNormal"
style=3D"color:bl=
ack;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 l=
fo11">
added state <i>FAILED</i>: An uncaught exception escaped while calling an e=
vent handler function, which indicates internal error within the plugin cod=
e. The plugin is removed from service.</li></ul>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"color:=
black">I've attached a simple state diagram that illustrates different stat=
es 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 ha=
ndled 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. Ot=
herwise, plugin code running in the context of an iframe'd host page will f=
ail to evaluate "parent.pluginApi" expression, with "parent" being
top-leve=
l (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, shoul=
d 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
t=
han Engine (REST API). In future, we'll address this with Apache reverse pr=
oxy configuration, so that users
can configure Apache server (placed in front of Engine JBoss AS) to put ar=
bitrary (local or remote non-Engine) services on same origin. However, this=
requires a change in current Apache configuration. Until then, users can m=
anually edit the Engine Apache configuration
file (<i>/etc/httpd/conf.d/ovirt-engine.conf</i>).</span></p>
<div class=3D"MsoNormal" style=3D"text-align:center"
align=3D"center"><span=
style=3D"color:black">
<hr align=3D"center" size=3D"2" width=3D"100%">
</span></div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"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 pa=
tch to oVirt Gerrit:
<a href=3D"http://gerrit.ovirt.org/8120"
target=3D"_blank">http://gerrit.ov=
irt.org/8120</a><br>
<br>
Let me know what you think!<br>
<br>
Cheers,<br>
Vojtech</span></p>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p
class=3D"MsoNormal"><ui-plugin-sample-files.tar.gz></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><ui-plugin-lifecycle.png></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p
class=3D"MsoNormal">_______________________________________________<br>
Engine-devel mailing list<br>
<a href=3D"mailto:Engine-devel@ovirt.org"
target=3D"_blank">Engine-devel@ov=
irt.org</a><br>
<a href=3D"http://lists.ovirt.org/mailman/listinfo/engine-devel"
target=3D"=
_blank">http://lists.ovirt.org/mailman/listinfo/engine-devel</...
</div>
</blockquote>
</div>
</div><br></div></body></html>
------=_Part_3896354_1791016925.1349203611679--
2:15 p.m.
New subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here
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--_000_D290AD8432118048947689BA3AE8A9B3E47C3DSACEXCMBX04PRDhqn_--
3:24 a.m.
New subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here
On 10/02/2012 08:46 PM, Vojtech Szocs wrote:
Hi Chris,
many thanks for your feedback and suggestions :)
Adding context-sensitive button with corresponding menu item sounds good! In fact, this
is the proper way how context menu items should be handled, since WebAdmin data grids work
with context-sensitive "action buttons" which are reflected within the context
menu. I agree that this is a very useful feature to have in plugin API, it should be
implemented as part of next major PoC revision.
I have a question though: when the user clicks the custom button or corresponding context
menu item, will your plugin handle common dialog UI (everything except actual content) on
its own, or do you prefer to have some kind of "dialog UI" API to create the
standard-looking dialog frame for you? I like the idea of using iframe to present custom
content though :)
As for grouping multiple context-sensitive buttons and corresponding context menu items,
this makes sense and we have something like this already implemented in WebAdmin (in Host
main tab, Power Management drop-down group button, but this is defined not to appear in
context menu though). I think this should be part of "custom context-sensitive button
/ menu item" plugin API feature.
> 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.
If I understand correctly, this is about providing "dialog UI" API to create
the standard-looking dialog frame + custom content iframe. I'd like to help with this
as well, but you can play with the code and propose a patch on top of PoC rev.5
[http://gerrit.ovirt.org/8120].
> For the reverse proxy, would it be easier from a customer standpoint to just include
a reverse proxy servlet such as this one?
Actually, I was under the impression that oVirt Engine (3.1) package (ovirt-engine) takes
care of setting up Apache web server, which redirects all traffic to Engine JBoss AS by
default (but maybe I am wrong here). However, if this is the case, an efficient way to
work around same-origin policy (cross-origin issues) is to configure Apache's reverese
proxy module (mod_proxy), as discussed in another thread on engine-devel:
http://lists.ovirt.org/pipermail/engine-devel/2012-September/002511.html
This way, you could use Apache to bring Engine and arbitrary (local or remote) web
services on same origin. What do you think?
On the other hand, using a special-purpose reverse proxy servlet directly in Engine, not
sure if that's a good idea though.. (I'd prefer configuring "front-end"
web server, such as Apache, for this purpose)
Chris, adding the proxy servlet brings a new dependency that can be
difficult to package. The one that you propose in particular is not
included in many distributions, including Fedora.
On the other hand using the web server doesn't bring any additional
dependency, as mod_proxy is already part of almost any installation of
Apache. We already use it by default to redirect requests to the
application server as Vojtech said.
Imagine for example that the engine is running in ovirt.example.com and
that you need to access from your UI plugin a web service running in
netapp.example.com. All what will be needed is dropping a new
netapp-plugin.conf file in the /etc/httpd/conf.d directory with a
content similar to this one:
ProxyPass /myservice http://netapp.example.com/myservice
This can be easily done in the package of your plugin.
There are some things that we need to solve to make this work (currently
we send *all* the requests to the application server), but we want to
solve them anyway.
I'm also sending a couple of updates:
UI Plugins Follow-Up Meeting: scheduled for Tuesday, October 9 at 4pm GMT+1 (I'll
send a meeting invitation soon, also planning to re-write oVirt UI Plugins wiki soon after
that)
PoC rev.5 patch update: many thanks to Juan and Doron for reviewing the recent patch
[http://gerrit.ovirt.org/8120]! I'll update the patch accordingly as revision 5.1
Planned items to be included in PoC revision 6:
* adding custom context-sensitive button (either separately or within a button
group), along with corresponding context menu item representation
* update custom main tab to show the actual content (iframe) from the given URL
* adding custom sub tab that shows content from the given URL
More items to consider having in PoC revision 6:
* "dialog UI" API to create the standard-looking dialog frame + custom
content iframe
* Engine REST API exposed through plugin API
* integration with Tasks pane to provide visual feedback on custom operations
* extending existing dialogs (e.g. Edit Cluster Policy - custom properties)
Let me know what you think.
Regards,
Vojtech
----- Original Message -----
From: "Christopher Morrissey" <Christopher.Morrissey(a)netapp.com>
To: vszocs(a)redhat.com
Cc: "George Costea" <George.Costea(a)netapp.com>, "Dustin
Schoenbrun" <Dustin.Schoenbrun(a)netapp.com>, engine-devel(a)ovirt.org
Sent: Tuesday, October 2, 2012 6:15:34 PM
Subject: RE: [Engine-devel] UI Plugins: PoC patch revision 5 is here
Hi Vojtech,
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.
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.
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.
For the reverse proxy, would it be easier from a customer standpoint to just include a
reverse proxy servlet such as this one? http://sourceforge.net/projects/j2ep/
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.
Thanks,
Chris
From: Vojtech Szocs < vszocs(a)redhat.com >
Date: September 21, 2012 4:37:31 PM EDT
To: engine-devel < engine-devel(a)ovirt.org >
Subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here
<blockquote>
Hi guys,
it's been a while but here comes the latest revision of UI Plugins proof-of-concept
patch (please find it attached).
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.
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!
So here we go... (or if you just want to get the patch, find the link at the end of this
message)
0. Added new Engine configuration values
UI plugin data path is represented by ConfigValues.UIPluginDataPath enum option
("UIPluginDataPath" in vdc_options table), and resolved relative to
ConfigValues.DataDir if possible. Following (default) values:
* UIPluginDataPath = ui-plugins
* DataDir = /usr/share/ovirt-engine
result in UI plugin data path: /usr/share/ovirt-engine/ui-plugins
UI plugin config path is represented by ConfigValues.UIPluginConfigPath enum option
("UIPluginConfigPath" in vdc_options table), and resolved relative to
ConfigValues.ConfigDir if possible. Following (default) values:
* UIPluginConfigPath = ui-plugins
* ConfigDir = /etc/ovirt-engine
result in UI plugin config path: /etc/ovirt-engine/ui-plugins
1. Processing UI plugin data on the server
PluginDataManager is the class responsible for reading, validating and caching UI plugin
descriptor/configuration data on the server (Engine). It has two main responsibilities:
* return a snapshot of currently valid plugin data ( getCurrentData method)
* reload plugin data from local file system if necessary ( reloadData method)
The reloadData 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
java.util.concurrent.atomic.AtomicReference.compareAndSet method).
In other words, reloadData method makes no attempts with regard to Java lock-based
synchronization, in favor of dealing with "live" data through AtomicReference
(reference that involves atomic volatile reads and writes):
* In the best case, a thread will succeed in updating "live" data (
AtomicReference.compareAndSet == true), which means that "live" data remained
unchanged since this thread acquired a reference of current plugin data.
* In the worst case, a thread will NOT succeed in updating "live" data (
AtomicReference.compareAndSet == false), which means that "live" data was
already changed by another thread since this thread acquired a reference of current plugin
data.
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 ( reloadData +
getCurrentData ), 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 synchronized 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.
Plugin descriptor files are expected to be placed in UI plugin data path, for example:
/usr/share/ovirt-engine/ui-plugins/foo.json
Following descriptor file attributes are implemented and recognized by the plugin
infrastructure:
* name : A name that uniquely identifies the plugin (required attribute).
* url : URL of plugin host page that invokes the plugin code (required attribute).
* config : Default configuration object associated with the plugin (optional
attribute).
* resourcePath : Path to plugin static resources, relative to UI plugin data path
(optional attribute). This is used when serving plugin files through Engine
PluginResourceServlet (more on this below).
Plugin configuration files are expected to be placed in UI plugin config path, for
example: /etc/engine/ui-plugins/foo-config.json
Note that plugin configuration files follow the
"<descriptorFileName>-config.json" convention.
Following configuration file attributes are implemented and recognized by the plugin
infrastructure:
* config : Custom configuration object associated with the plugin (optional
attribute). This overrides the default plugin descriptor configuration, if any.
* enabled : Indicates whether the plugin should be loaded on WebAdmin startup
(optional attribute). Default value is 'true'.
* order : Defines the relative order in which the plugin will be loaded on WebAdmin
startup (optional attribute). Default value is Integer.MAX_VALUE (lowest order).
The concept of merging custom configuration ( config attribute in foo-config.json ), if
any, on top of default configuration ( config attribute in foo.json ), 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.
The enabled 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.
The order 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 java.io.File 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).
2. Modified behavior of WebadminDynamicHostingServlet
WebadminDynamicHostingServlet is the servlet used to serve WebAdmin application host page
(HTML page that bootstraps WebAdmin JavaScript code).
In addition to its former behavior, as part of handling the given request,
WebadminDynamicHostingServlet :
* reloads descriptor/configuration data from local file system if necessary, and
obtains a snapshot of currently valid plugin data (
PluginDataManager.reloadAndGetCurrentData )
* embeds all plugin meta-data, suitable for use in client-side plugin infrastructure,
into WebAdmin host page as "pluginDefinitions" JavaScript array (
PluginDefinitions )
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).
3. Added servlet for serving plugin static resources
PluginResourceServlet is the servlet used to serve UI plugin static files (plugin host
page, 3rd party JavaScript, etc.) from the local file system.
For example, requesting URL:
*
http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/start.html
will send the content of:
* /usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.html
to the client.
As shown in the above example:
* /webadmin/webadmin/plugin/ is the servlet root path for PluginResourceServlet
* in the extra path beyond the servlet root path ( /foo/content/start.html ):
* /foo represents the name of the plugin
* /content/start.html represents the path to requested resource, relative to
"UIPluginDataPath / <resourcePath>"
Note that each plugin using PluginResourceServlet to serve its static files must declare
non-empty resourcePath attribute in within the plugin descriptor.
Also note that PluginResourceServlet , unlike WebadminDynamicHostingServlet , 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
PluginResourceServlet reading the current plugin information.
Until we solve the cross-origin issue in a clean way, PluginResourceServlet should be
used to serve all plugin resources from local file system.
4. Plugin lifecycle improved to deal with misbehaving plugins
PluginState enum has been modified to deal with plugins that allow uncaught exceptions to
escape from plugin event handler functions (e.g. "UiInit"):
* removed state INITIALIZED
* added state INITIALIZING : The plugin is (currently) being initialized by calling
UiInit event handler function.
* added state IN_USE : 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.
* added state FAILED : An uncaught exception escaped while calling an event handler
function, which indicates internal error within the plugin code. The plugin is removed
from service.
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).
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.
Update on cross-origin issue (consequence of same-origin policy)
In order for the plugin to access WebAdmin plugin API, plugin host page (e.g. start.html
) 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.
This is why PluginResourceServlet , available on Engine origin, should be used to serve
all plugin resources from local file system.
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 ( /etc/httpd/conf.d/ovirt-engine.conf ).
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: http://gerrit.ovirt.org/8120
Let me know what you think!
Cheers,
Vojtech
</blockquote>
<blockquote>
<ui-plugin-sample-files.tar.gz>
</blockquote>
<blockquote>
<ui-plugin-lifecycle.png>
</blockquote>
<blockquote>
_______________________________________________
Engine-devel mailing list
Engine-devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/engine-devel
</blockquote>
_______________________________________________
Engine-devel mailing list
Engine-devel(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/engine-devel
--
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3ºD, 28016 Madrid, Spain
Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.
5:18 a.m.
New subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here
------=_Part_4133380_10286535.1349259508244
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Hey Chris,=20
my idea of implementing context-sensitive buttons (menu items) and related =
dialogs was to de-couple button registration from actual dialog handling, l=
ike so:=20
* add custom button to specific data grid as part of UiInit event, prov=
iding callback that represents the "button/menu clicked" action, e.g.
"plug=
inApi.addActionButton(title, callback)"=20
* within the above mentioned callback, show the custom dialog using " p=
luginApi. showDialog(title, contentUrl, buttons?)" [note: this is the "dial=
og UI API" I meant in my previous email]=20
This basically splits your use-case into two distinct API features (addActi=
onButton, showDialog). For example, one button could show a custom dialog, =
another one could perform other (non-dialog) actions. What do you think?=20
Or potentially since it is a dialog, it could just show it in
separate wi=
ndow altogether.=20
Good idea for initial implementation! This could be easily added to PoC rev=
.6. Ultimately, I'd prefer a "dialog UI API", so that custom dialogs will
h=
ave same "look and feel" as standard ones (can be done later on though).=20
I=E2=80=99ll start looking at adding the ability to launch a dialog
with =
context through the plugin API and let you know how that goes in a few days=
(Maybe sooner if I have questions about it. ;)=20
Great, I think you could start with the above mentioned initial implementat=
ion, here are some tips:=20
* add "showDialog(title, contentUrl)" function to plugin API within Plu=
ginManager. exposePluginApi () method=20
* use GWT JSNI to delegate the call to PluginUiFunctions, e.g. PluginUi=
Functions.showDialog() method=20
* implement showDialog() method using GWT Window.open (), or WebUtils.o=
penUrlInNewWindow()=20
(The above mentioned steps are basically the recipe for adding/implementing=
new plugin API function.)=20
Finally, would it be possible to give an estimate on when you think
the P=
oC rev 6 will be available? We=E2=80=99ve got scheduled deliveries internal=
ly based on this code and it would be better to make sure everything lines =
up now.=20
Well, I'm planning to revisit rev.5 according to review comments, and prepa=
re for UI Plugins Follow-Up Meeting (October 9). I will start working on re=
v.6 patch right after that.=20
Finalizing custom (URL-based iframe'd) main tab, plus API for adding same k=
ind of custom sub tab, should be quite easy - couple of days.=20
Custom context-sensitive buttons (menu items), should be easy as well, but =
there is some UiCommon integration necessary - 3-4 days.=20
Maybe we can split these two in separate rev.6 releases, what do you think?=
If you prefer to have both implemented as part of rev.6 patch, my rough es=
timate is around October 19.=20
Regards,=20
Vojtech=20
----- Original Message -----
From: "Christopher Morrissey" <Christopher.Morrissey(a)netapp.com>=20
To: "Vojtech Szocs" <vszocs(a)redhat.com>=20
Cc: "George Costea" <George.Costea(a)netapp.com>, "Dustin
Schoenbrun" <Dustin=
.Schoenbrun(a)netapp.com>, engine-devel(a)ovirt.org=20
Sent: Tuesday, October 2, 2012 9:15:45 PM=20
Subject: RE: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
Hi Vojtech,=20
Thanks for the reply. The plugin framework for adding a custom context sens=
itive button/menu item and the iframe loading support for the main tab plug=
in will be welcome additions.=20
For the custom UI dialog, we=E2=80=99re looking for something that works si=
milar to the tab in that it will show a particular URL in an iFrame in a di=
alog. Or potentially since it is a dialog, it could just show it in separat=
e window altogether. The dialog would be opened when the context sensitive =
button or menu item is activated. So it would be nice if the plugin framewo=
rk would allow a plugged in button definition to define a URL to load in a =
dialog when it is activated.=20
I=E2=80=99ll start looking at adding the ability to launch a dialog with co=
ntext through the plugin API and let you know how that goes in a few days (=
Maybe sooner if I have questions about it. ;)=20
Finally, would it be possible to give an estimate on when you think the PoC=
rev 6 will be available? We=E2=80=99ve got scheduled deliveries internally=
based on this code and it would be better to make sure everything lines up=
now.=20
Thanks!=20
Chris=20
From: Vojtech Szocs [mailto:vszocs@redhat.com]=20
Sent: Tuesday, October 02, 2012 2:47 PM=20
To: Morrissey, Christopher=20
Cc: Costea, George; Schoenbrun, Dustin; engine-devel(a)ovirt.org=20
Subject: Re: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
Hi Chris,=20
many thanks for your feedback and suggestions :)=20
Adding context-sensitive button with corresponding menu item sounds good! I=
n fact, this is the proper way how context menu items should be handled, si=
nce WebAdmin data grids work with context-sensitive "action buttons" which =
are reflected within the context menu. I agree that this is a very useful f=
eature to have in plugin API, it should be implemented as part of next majo=
r PoC revision.=20
I have a question though: when the user clicks the custom button or corresp=
onding context menu item, will your plugin handle common dialog UI (everyth=
ing except actual content) on its own, or do you prefer to have some kind o=
f "dialog UI" API to create the standard-looking dialog frame for you? I li=
ke the idea of using iframe to present custom content though :)=20
As for grouping multiple context-sensitive buttons and corresponding contex=
t menu items, this makes sense and we have something like this already impl=
emented in WebAdmin (in Host main tab, Power Management drop-down group but=
ton, but this is defined not to appear in context menu though). I think thi=
s should be part of "custom context-sensitive button / menu item" plugin AP=
I feature.=20
If needed we can help work on an implementation for the dialog popup
plug=
in framework as we=E2=80=99d like to get it in relatively quickly so we can=
move forward on the content side of our plugin.=20
If I understand correctly, this is about providing "dialog UI" API to creat=
e the standard-looking dialog frame + custom content iframe. I'd like to he=
lp with this as well, but you can play with the code and propose a patch on=
top of PoC rev.5 [http://gerrit.ovirt.org/8120].=20
For the reverse proxy, would it be easier from a customer standpoint
to j=
ust include a reverse proxy servlet such as this one?=20
Actually, I was under the impression that oVirt Engine (3.1) package (ovirt=
-engine) takes care of setting up Apache web server, which redirects all tr=
affic to Engine JBoss AS by default (but maybe I am wrong here). However, i=
f this is the case, an efficient way to work around same-origin policy (cro=
ss-origin issues) is to configure Apache's reverese proxy module (mod_proxy=
), as discussed in another thread on engine-devel: http://lists.ovirt.org/p=
ipermail/engine-devel/2012-September/002511.html=20
This way, you could use Apache to bring Engine and arbitrary (local or remo=
te) web services on same origin. What do you think?=20
On the other hand, using a special-purpose reverse proxy servlet directly i=
n Engine, not sure if that's a good idea though.. (I'd prefer configuring "=
front-end" web server, such as Apache, for this purpose)=20
I'm also sending a couple of updates:=20
UI Plugins Follow-Up Meeting: scheduled for Tuesday, October 9 at 4pm GMT+1=
(I'll send a meeting invitation soon, also planning to re-write oVirt UI P=
lugins wiki soon after that)=20
PoC rev.5 patch update: many thanks to Juan and Doron for reviewing the rec=
ent patch [http://gerrit.ovirt.org/8120]! I'll update the patch accordingly=
as revision 5.1=20
Planned items to be included in PoC revision 6:=20
* adding custom context-sensitive button (either separately or within a=
button group), along with corresponding context menu item representation=
=20
* update custom main tab to show the actual content (iframe) from the g=
iven URL=20
* adding custom sub tab that shows content from the given URL=20
More items to consider having in PoC revision 6:=20
* "dialog UI" API to create the standard-looking dialog frame + custom =
content iframe=20
* Engine REST API exposed through plugin API=20
* integration with Tasks pane to provide visual feedback on custom oper=
ations=20
* extending existing dialogs (e.g. Edit Cluster Policy - custom propert=
ies)=20
Let me know what you think.=20
Regards,=20
Vojtech=20
----- Original Message -----
From: "Christopher Morrissey" <Christopher.Morrissey(a)netapp.com>=20
To: vszocs(a)redhat.com=20
Cc: "George Costea" <George.Costea(a)netapp.com>, "Dustin
Schoenbrun" <Dustin=
.Schoenbrun(a)netapp.com>, engine-devel(a)ovirt.org=20
Sent: Tuesday, October 2, 2012 6:15:34 PM=20
Subject: RE: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
Hi Vojtech,=20
The patch is great and has cleared up some questions I had about the implem=
entation. I=E2=80=99ve been able to get the sample plugins working and wade=
d through the code changes, so feel like I have a good understanding of wha=
t was delivered. Thanks a lot for putting this all together. I do have a fe=
w questions and suggestions for you, though.=20
Will there eventually be a way to add one or more buttons to the context se=
nsitive buttons and menus throughout the interface? For example, we=E2=80=
=99d like to allow a button to provision a datastore when a data center, cl=
uster, or host is selected. When the button is clicked, it would open a dia=
log with an iframe in which we would load our interface to perform the asso=
ciated 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=E2=80=99t get too cluttered. We=E2=80=99d=
also like to add these same actions to the menus that popup when a context=
ual object is right clicked.=20
If needed we can help work on an implementation for the dialog popup plugin=
framework as we=E2=80=99d like to get it in relatively quickly so we can m=
ove forward on the content side of our plugin.=20
For the reverse proxy, would it be easier from a customer standpoint to jus=
t include a reverse proxy servlet such as this one? http://sourceforge.net/=
projects/j2ep/=20
I=E2=80=99m just thinking that setting up and managing a plugin for the HTT=
P server may be more complex than including one internally that would be tr=
ansparent to a customer.=20
Thanks,=20
Chris=20
From: Vojtech Szocs < vszocs(a)redhat.com >=20
Date: September 21, 2012 4:37:31 PM EDT=20
To: engine-devel < engine-devel(a)ovirt.org >=20
Subject: [Engine-devel] UI Plugins: PoC patch revision 5 is here=20
<blockquote>
Hi guys,=20
it's been a while but here comes the latest revision of UI Plugins proof-of=
-concept patch (please find it attached).=20
This revision was originally meant to focus solely on server-side component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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.=20
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!=20
So here we go... (or if you just want to get the patch, find the link at th=
e end of this message)=20
0. Added new Engine configuration values=20
UI plugin data path is represented by ConfigValues.UIPluginDataPath enum op=
tion ("UIPluginDataPath" in vdc_options table), and resolved relative to Co=
nfigValues.DataDir if possible. Following (default) values:=20
* UIPluginDataPath =3D ui-plugins=20
* DataDir =3D /usr/share/ovirt-engine=20
result in UI plugin data path: /usr/share/ovirt-engine/ui-plugins=20
UI plugin config path is represented by ConfigValues.UIPluginConfigPath enu=
m option ("UIPluginConfigPath" in vdc_options table), and resolved relative=
to ConfigValues.ConfigDir if possible. Following (default) values:=20
* UIPluginConfigPath =3D ui-plugins=20
* ConfigDir =3D /etc/ovirt-engine=20
result in UI plugin config path: /etc/ovirt-engine/ui-plugins=20
1. Processing UI plugin data on the server=20
PluginDataManager is the class responsible for reading, validating and cach=
ing UI plugin descriptor/configuration data on the server (Engine). It has =
two main responsibilities:=20
* return a snapshot of currently valid plugin data ( getCurrentData met=
hod)=20
* reload plugin data from local file system if necessary ( reloadData m=
ethod)=20
The reloadData method doesn't modify "live" plugin data directly. Instead,
=
it creates a local working copy of current plugin data, updates this copy a=
s it reads/validates plugin descriptor and configuration files, and attempt=
s to update "live" plugin data through conditional reference re-assignment =
(using java.util.concurrent.atomic.AtomicReference.compareAndSet method).=
=20
In other words, reloadData method makes no attempts with regard to Java loc=
k-based synchronization, in favor of dealing with "live" data through Atomi=
cReference (reference that involves atomic volatile reads and writes):=20
* In the best case, a thread will succeed in updating "live" data ( Ato=
micReference.compareAndSet =3D=3D true), which means that "live" data remai=
ned unchanged since this thread acquired a reference of current plugin data=
.=20
* In the worst case, a thread will NOT succeed in updating "live" data =
( AtomicReference.compareAndSet =3D=3D false), which means that "live" data=
was already changed by another thread since this thread acquired a referen=
ce of current plugin data.=20
In my opinion, when dealing with external resources like the local file sys=
tem, this is a good compromise between performance and up-to-date data. Whi=
le we might not get "completely-up-to-date" data at the given point in time=
( reloadData + getCurrentData ), we are guaranteed to get "recently-up-to-=
date" and consistent data. In other words, the requirement of "completely-u=
p-to-date" data would involve synchronized statements that would hurt perfo=
rmance. In my (very humble) opinion, the benefit of having "completely-up-t=
o-date" data, at the cost of reduced performance, is not really worth it, e=
specially in our case when the user can just hit refresh (F5) to reload Web=
Admin and its plugin data.=20
Plugin descriptor files are expected to be placed in UI plugin data path, f=
or example: /usr/share/ovirt-engine/ui-plugins/foo.json=20
Following descriptor file attributes are implemented and recognized by the =
plugin infrastructure:=20
* name : A name that uniquely identifies the plugin (required attribute=
).=20
* url : URL of plugin host page that invokes the plugin code (required =
attribute).=20
* config : Default configuration object associated with the plugin (opt=
ional attribute).=20
* resourcePath : Path to plugin static resources, relative to UI plugin=
data path (optional attribute). This is used when serving plugin files thr=
ough Engine PluginResourceServlet (more on this below).=20
Plugin configuration files are expected to be placed in UI plugin config pa=
th, for example: /etc/engine/ui-plugins/foo-config.json=20
Note that plugin configuration files follow the "<descriptorFileName>-confi=
g.json" convention.=20
Following configuration file attributes are implemented and recognized by t=
he plugin infrastructure:=20
* config : Custom configuration object associated with the plugin (opti=
onal attribute). This overrides the default plugin descriptor configuration=
, if any.=20
* enabled : Indicates whether the plugin should be loaded on WebAdmin s=
tartup (optional attribute). Default value is 'true'.=20
* order : Defines the relative order in which the plugin will be loaded=
on WebAdmin startup (optional attribute). Default value is Integer.MAX_VAL=
UE (lowest order).=20
The concept of merging custom configuration ( config attribute in foo-confi=
g.json ), if any, on top of default configuration ( config attribute in foo=
.json ), if any, remains unchanged. This makes the plugin configuration qui=
te flexible - in my opinion, the added complexity of handling/merging such =
configuration is definitely worth the effort.=20
The enabled attribute is straight-forward, allowing users to turn the given=
plugin off, if necessary. In future, users should still be able to load su=
ch plugins through WebAdmin GUI.=20
The order attribute controls the order in which plugins are loaded on WebAd=
min startup. Since plugin resources are fetched asynchronously by the brows=
er, this is basically a way of imposing some degree of determinism in the "=
generally-non-deterministic" plugin environment, which is helpful when trou=
bleshooting problems with multiple plugins. This attribute is also helpful =
due to file listing methods in java.io.File giving no guarantees that files=
would be listed in any particular order (otherwise we could just go for th=
e "NN-<descriptorFileName>.json" convention, with NN being the order
number=
).=20
2. Modified behavior of WebadminDynamicHostingServlet=20
WebadminDynamicHostingServlet is the servlet used to serve WebAdmin applica=
tion host page (HTML page that bootstraps WebAdmin JavaScript code).=20
In addition to its former behavior, as part of handling the given request, =
WebadminDynamicHostingServlet :=20
* reloads descriptor/configuration data from local file system if neces=
sary, and obtains a snapshot of currently valid plugin data ( PluginDataMan=
ager.reloadAndGetCurrentData )=20
* embeds all plugin meta-data, suitable for use in client-side plugin i=
nfrastructure, into WebAdmin host page as "pluginDefinitions" JavaScript ar=
ray ( PluginDefinitions )=20
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).=20
3. Added servlet for serving plugin static resources=20
PluginResourceServlet is the servlet used to serve UI plugin static files (=
plugin host page, 3rd party JavaScript, etc.) from the local file system.=
=20
For example, requesting URL:=20
* http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/content/=
start.html=20
will send the content of:=20
* /usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.html=
=20
to the client.=20
As shown in the above example:=20
* /webadmin/webadmin/plugin/ is the servlet root path for PluginResourc=
eServlet=20
* in the extra path beyond the servlet root path ( /foo/content/start.h=
tml ):=20
* /foo represents the name of the plugin=20
* /content/start.html represents the path to requested resource, re=
lative to "UIPluginDataPath / <resourcePath>"=20
Note that each plugin using PluginResourceServlet to serve its static files=
must declare non-empty resourcePath attribute in within the plugin descrip=
tor.=20
Also note that PluginResourceServlet , unlike WebadminDynamicHostingServlet=
, does NOT reload descriptor/configuration data from local file system as =
part of handling the given request. In other words, it's assumed that plugi=
n data has already been (re)loaded when serving WebAdmin application host p=
age, with subsequent requests to PluginResourceServlet reading the current =
plugin information.=20
Until we solve the cross-origin issue in a clean way, PluginResourceServlet=
should be used to serve all plugin resources from local file system.=20
4. Plugin lifecycle improved to deal with misbehaving plugins=20
PluginState enum has been modified to deal with plugins that allow uncaught=
exceptions to escape from plugin event handler functions (e.g. "UiInit"):=
=20
* removed state INITIALIZED=20
* added state INITIALIZING : The plugin is (currently) being initialize=
d by calling UiInit event handler function.=20
* added state IN_USE : Plugin's UiInit event handler function has compl=
eted successfully, we can now call other event handler functions as necessa=
ry. The plugin is in use now.=20
* added state FAILED : An uncaught exception escaped while calling an e=
vent handler function, which indicates internal error within the plugin cod=
e. The plugin is removed from service.=20
I've attached a simple state diagram that illustrates different states and =
transitions between them (green color is initial state, red color is end st=
ate).=20
Uncaught exceptions in plugin event handler functions will be caught and ha=
ndled 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.=
=20
Update on cross-origin issue (consequence of same-origin policy)=20
In order for the plugin to access WebAdmin plugin API, plugin host page (e.=
g. start.html ) must be served from URL on same origin as Engine origin. Ot=
herwise, plugin code running in the context of an iframe'd host page will f=
ail to evaluate "parent.pluginApi" expression, with "parent" being
top-leve=
l (WebAdmin) window, and "pluginApi" being the global plugin API object exp=
osed by WebAdmin.=20
This is why PluginResourceServlet , available on Engine origin, should be u=
sed to serve all plugin resources from local file system.=20
There's only one issue that remains to be solved: cross-origin "plugin vs. =
remote service" communication, with "remote service" being anything other
t=
han Engine (REST API). In future, we'll address this with Apache reverse pr=
oxy configuration, so that users can configure Apache server (placed in fro=
nt of Engine JBoss AS) to put arbitrary (local or remote non-Engine) servic=
es on same origin. However, this requires a change in current Apache config=
uration. Until then, users can manually edit the Engine Apache configuratio=
n file ( /etc/httpd/conf.d/ovirt-engine.conf ).=20
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 pa=
tch to oVirt Gerrit: http://gerrit.ovirt.org/8120=20
Let me know what you think!=20
Cheers,=20
Vojtech=20
</blockquote>
<blockquote>
<ui-plugin-sample-files.tar.gz>=20
</blockquote>
<blockquote>
<ui-plugin-lifecycle.png>=20
</blockquote>
<blockquote>
_______________________________________________=20
Engine-devel mailing list=20
Engine-devel(a)ovirt.org=20
http://lists.ovirt.org/mailman/listinfo/engine-devel=20
</blockquote>
------=_Part_4133380_10286535.1349259508244
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
<html><head><style type=3D'text/css'>p { margin: 0;
}</style></head><body><=
div style=3D'font-family: times new roman,new york,times,serif; font-size: =
12pt; color: #000000'>Hey Chris,<br><br>my idea of implementing
context-sen=
sitive buttons (menu items) and related dialogs was to de-couple button reg=
istration from actual dialog handling, like so:<br><ul><li>add custom
butto=
n to specific data grid as part of UiInit event, providing callback that re=
presents the "button/menu clicked" action, e.g.
"pluginApi.addActionButton(=
title, callback)"<br></li><li>within the above mentioned callback,
show the=
custom dialog using "pluginApi.showDialog(title, contentUrl, buttons?)" [n=
ote: this is the <span style=3D"color:black">"dialog UI API" I
meant in my =
previous email]<br></span></li></ul><br>This basically
splits your use-case=
into two distinct API features (addActionButton, showDialog). For example,=
one button could show a custom dialog, another one could perform other (no=
n-dialog) actions. What do you think?<br><br>> <span
style=3D"font-size:=
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D=
">Or potentially
since it is a dialog, it could just show it in separate window altogether.=
<br></span><br>Good idea for initial implementation! This could be
easily =
added to PoC rev.6. Ultimately, I'd prefer a <span
style=3D"color:black">"d=
ialog UI API", so that custom dialogs will have same "look and feel" as
sta=
ndard ones (can be done later on though).</span><br><br>>
<span style=3D=
"font-size:11.0pt;font-family:"Calibri","sans-serif";co=
lor:#1F497D">I=E2=80=99ll
start looking at adding the ability to launch a dialog with context=20
through the plugin API and let you know how that goes in a few days=20
(Maybe sooner if
I have questions about it. ;)</span><br><br>Great, I think you could
start=
with the above mentioned initial implementation, here are some tips:<br><u=
l><li>add "showDialog(title, contentUrl)" function to plugin API within
Plu=
ginManager.<span class=3D"pln">exposePluginApi</span><span
class=3D"pun">()=
method</span></li><li><span class=3D"pun">use GWT JSNI
to delegate the cal=
l to </span><span class=3D"gwt-InlineLabel">PluginUiFunctions, e.g.
</span>=
<span class=3D"gwt-InlineLabel">PluginUiFunctions.showDialog()
method</span=
</li><li><span
class=3D"gwt-InlineLabel">implement showDialog() method usi=
ng GWT
Window.open(), or
WebUtils.openUrlInNewWindow()</span></li></ul><p><=
br></p>(The above mentioned steps are basically the recipe for adding/imple=
menting new plugin API function.)<br><br>> <span
style=3D"font-size:11.0=
pt;font-family:"Calibri","sans-serif";color:#1F497D">Fi=
nally,
would it be possible to give an estimate on when you think the PoC rev 6
will be available? We=E2=80=99ve got scheduled deliveries internally based=
on=20
this
code and it would be better to make sure everything lines up now.</span><b=
r><br>Well, I'm planning to revisit rev.5 according to review comments, and=
prepare for UI Plugins Follow-Up Meeting (October 9). I will start working=
on rev.6 patch right after that.<br><br>Finalizing custom (URL-based ifram=
e'd) main tab, plus API for adding same kind of custom sub tab, should be q=
uite easy - couple of days.<br>Custom context-sensitive buttons (menu items=
), should be easy as well, but there is some UiCommon integration necessary=
- 3-4 days.<br><br>Maybe we can split these two in separate rev.6 releases=
, what do you think? If you prefer to have both implemented as part of rev.=
6 patch, my rough estimate is around October
19.<br><br>Regards,<br>Vojtech=
<br><br><br><hr id=3D"zwchr"><div
style=3D"color:#000;font-weight:normal;fo=
nt-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif=
;font-size:12pt;"><b>From: </b>"Christopher Morrissey"
<Christopher.Morr=
issey(a)netapp.com&gt;<br><b>To: </b>"Vojtech Szocs"
&lt;vszocs(a)redhat.com&gt=
;<br><b>Cc: </b>"George Costea"
&lt;George.Costea(a)netapp.com&gt;, "Dustin S=
choenbrun" &lt;Dustin.Schoenbrun(a)netapp.com&gt;,
engine-devel(a)ovirt.org<br>=
<b>Sent: </b>Tuesday, October 2, 2012 9:15:45 PM<br><b>Subject:
</b>RE: [En=
gine-devel] UI Plugins: PoC patch revision 5 is here<br<br>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Hi
Vojtech,</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thanks for the
reply. The=
plugin framework for adding a custom context sensitive button/menu item an=
d the iframe loading support for the main tab plugin will
be welcome additions. </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">For the custom UI
dialog,=
we=E2=80=99re looking for something that works similar to the tab in that =
it will show a particular URL in an iFrame in a dialog. Or potentially
since it is a dialog, it could just show it in separate window altogether.=
The dialog would be opened when the context sensitive button or menu item =
is activated. So it would be nice if the plugin framework would allow a plu=
gged in button definition to define
a URL to load in a dialog when it is activated.</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">I=E2=80=99ll start
lookin=
g at adding the ability to launch a dialog with context through the plugin =
API and let you know how that goes in a few days (Maybe sooner if
I have questions about it. ;)</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Finally, would it be
poss=
ible to give an estimate on when you think the PoC rev 6 will be available?=
We=E2=80=99ve got scheduled deliveries internally based on this
code and it would be better to make sure everything lines up now.</span></=
p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thanks!</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Chris</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span
style=3D"font-size:10.0pt;font-family:"=
;Tahoma","sans-serif"">From:</span></b><span
style=3D"font-s=
ize:10.0pt;font-family:"Tahoma","sans-serif"">
Vojtech =
Szocs [mailto:vszocs@redhat.com]
<br>
<b>Sent:</b> Tuesday, October 02, 2012 2:47 PM<br>
<b>To:</b> Morrissey, Christopher<br>
<b>Cc:</b> Costea, George; Schoenbrun, Dustin;
engine-devel(a)ovirt.org<br>
<b>Subject:</b> Re: [Engine-devel] UI Plugins: PoC patch revision 5 is here=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"> </p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Hi
Chris,<br>
<br>
many thanks for your feedback and suggestions :)<br>
<br>
Adding context-sensitive button with corresponding menu item sounds good! I=
n fact, this is the proper way how context menu items should be handled, si=
nce WebAdmin data grids work with context-sensitive "action buttons" which =
are reflected within the context
menu. I agree that this is a very useful feature to have in plugin API, it=
should be implemented as part of next major PoC revision.<br>
<br>
I have a question though: when the user clicks the custom button or corresp=
onding context menu item, will your plugin handle common dialog UI (everyth=
ing except actual content) on its own, or do you prefer to have some kind o=
f "dialog UI" API to create the
standard-looking dialog frame for you? I like the idea of using iframe to =
present custom content though :)<br>
<br>
As for grouping multiple context-sensitive buttons and corresponding contex=
t menu items, this makes sense and we have something like this already impl=
emented in WebAdmin (in Host main tab, Power Management drop-down group but=
ton, but this is defined not to
appear in context menu though). I think this should be part of "custom con=
text-sensitive button / menu item" plugin API feature.<br>
<br>
> </span><span
style=3D"font-size:11.0pt;font-family:"Calibri"=
,"sans-serif";color:#1F497D">If needed we can help work on an
imp=
lementation for the dialog popup plugin framework as we=E2=80=99d like to g=
et it in relatively quickly so we can move forward on the content
side of our plugin.</span><span style=3D"color:black"<br>
<br>
If I understand correctly, this is about providing "dialog UI" API to creat=
e the standard-looking dialog frame + custom content iframe. I'd like to he=
lp with this as well, but you can play with the code and propose a pa=
tch on top of PoC rev.5 [http://gerrit.ovirt.org/8120].<br>
<br>
> </span><span
style=3D"font-size:11.0pt;font-family:"Calibri"=
,"sans-serif";color:#1F497D">For the reverse proxy, would it be
e=
asier from a customer standpoint to just include a reverse proxy servlet su=
ch as this one?<br>
</span><span style=3D"color:black"<br>
Actually, I was under the impression that oVirt Engine (3.1) package (ovirt=
-engine) takes care of setting up Apache web server, which redirects all tr=
affic to Engine JBoss AS by default (but maybe I am wrong here). However, i=
f this is the case, an efficient
way to work around same-origin policy (cross-origin issues) is to configur=
e Apache's reverese proxy module (mod_proxy), as discussed in another threa=
d on engine-devel:
<a href=3D"http://lists.ovirt.org/pipermail/engine-devel/2012-September...
511.html" target=3D"_blank">
http://lists.ovirt.org/pipermail/engine-devel/2012-September/002511.html&...
<br>
<br>
This way, you could use Apache to bring Engine and arbitrary (local or remo=
te) web services on same origin. What do you think?<br>
<br>
On the other hand, using a special-purpose reverse proxy servlet directly i=
n Engine, not sure if that's a good idea though.. (I'd prefer configuring "=
front-end" web server, such as Apache, for this purpose)<br>
<br>
I'm also sending a couple of updates:<br>
<br>
<strong>UI Plugins Follow-Up Meeting:</strong> scheduled for Tuesday, Octob=
er 9 at 4pm GMT+1 (I'll send a meeting invitation soon, also planning to re=
-write oVirt UI Plugins wiki soon after that)<br>
<br>
<b>PoC rev.5 patch update:</b> many thanks to Juan and Doron for reviewing =
the recent patch [http://gerrit.ovirt.org/8120]! I'll update the patch acco=
rdingly as revision 5.1<br>
<br>
<b>Planned items to be included in PoC revision 6:</b></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l7 level1 lfo1">
adding custom context-sensitive button (either separately or within a butto=
n group), along with corresponding context menu item representation</li><li=
class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-margi=
n-bottom-alt:auto;mso-list:l7 level1 lfo1">
update custom main tab to show the actual content (iframe) from the given U=
RL</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto;mso-list:l7 level1 lfo1">
adding custom sub tab that shows content from the given URL</li></ul>
<p><span style=3D"color:black"> </span></p>
<p><b><span style=3D"color:black">More items to consider
having in PoC revi=
sion 6:</span></b><span
style=3D"color:black"></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l11 level1 lfo2">
"dialog UI" API to create the standard-looking dialog frame + custom conten=
t iframe</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-al=
t:auto;mso-margin-bottom-alt:auto;mso-list:l11 level1 lfo2">
Engine REST API exposed through plugin API</li><li class=3D"MsoNormal"
styl=
e=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-lis=
t:l11 level1 lfo2">
integration with Tasks pane to provide visual feedback on custom operations=
</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto;mso-list:l11 level1 lfo2">
extending existing dialogs (e.g. Edit Cluster Policy - custom properties)</=
li></ul>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Let me know what you
think.</span></p>
<p><span style=3D"color:black"> </span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"color:=
black">Regards,<br>
Vojtech<br>
<br>
</span></p>
<div class=3D"MsoNormal" style=3D"text-align:center"
align=3D"center"><span=
style=3D"color:black">
<hr id=3D"zwchr" size=3D"2" width=3D"100%"
align=3D"center">
</span></div>
<div>
<p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><b><span style=3D"fon=
t-family:"Helvetica","sans-serif";color:black">From:
</span></b><span
style=3D"font-family:"Helvetica","sans-seri=
f";color:black">"Christopher Morrissey"
<Christopher.Morrissey@neta=
pp.com><br>
<b>To: </b>vszocs(a)redhat.com<br>
<b>Cc: </b>"George Costea" &lt;George.Costea(a)netapp.com&gt;,
"Dustin Schoen=
brun" &lt;Dustin.Schoenbrun(a)netapp.com&gt;, engine-devel(a)ovirt.org<br>
<b>Sent: </b>Tuesday, October 2, 2012 6:15:34 PM<br>
<b>Subject: </b>RE: [Engine-devel] UI Plugins: PoC patch revision 5 is here=
</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Hi
Vojtech,</span><span s=
tyle=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">The patch is great
and ha=
s cleared up some questions I had about the implementation. I=E2=80=99ve be=
en able to get the sample plugins working and waded through the
code changes, so feel like I have a good understanding of what was deliver=
ed. Thanks a lot for putting this all together. I do have a few questions a=
nd suggestions for you, though.</span><span
style=3D"color:black"></span></=
p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","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=E2=80=99d 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. Som=
e contexts would have several buttons,
such as a storage domain (provision, resize, dedupe management, destroy) s=
o 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=E2=80=99t get too clut=
tered. We=E2=80=99d also like to add these same
actions to the menus that popup when a contextual object is right clicked.=
</span><span style=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">If needed we can
help wor=
k on an implementation for the dialog popup plugin framework as we=E2=80=99=
d like to get it in relatively quickly so we can move forward on
the content side of our plugin.</span><span
style=3D"color:black"></span><=
/p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">For the reverse
proxy, wo=
uld it be easier from a customer standpoint to just include a reverse proxy=
servlet such as this one? </span><span
style=3D"color:black"><a href=
=3D"http://sourceforge.net/projects/j2ep/"
target=3D"_blank">http://sourcef=
orge.net/projects/j2ep/</a>
</span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">I=E2=80=99m just
thinking=
that setting up and managing a plugin for the HTTP server may be more comp=
lex than including one internally that would be transparent to a
customer.</span><span
style=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"> </span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thanks,</span><span
style=
=3D"color:black"></span></p>
<p class=3D"MsoNormal"><span
style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Chris</span><span
style=
=3D"color:black"></span></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"
style=3D"margin-bottom:12.0pt"><b><span style=3D"col=
or:black">From:</span></b><span style=3D"color:black">
Vojtech Szocs <<a=
href=3D"mailto:vszocs@redhat.com"
target=3D"_blank">vszocs(a)redhat.com</a>&=
gt;<br>
<b>Date:</b> September 21, 2012 4:37:31 PM EDT<br>
<b>To:</b> engine-devel <<a
href=3D"mailto:engine-devel@ovirt.org" targe=
t=3D"_blank">engine-devel(a)ovirt.org</a>&gt;<br>
<b>Subject:</b> <b>[Engine-devel] UI Plugins: PoC patch revision 5 is
here<=
/b></span></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"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 component=
s of the plugin infrastructure. However, I ended up implementing all the ma=
jor 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 th=
e end of this message)</span></p>
<div class=3D"MsoNormal" style=3D"text-align:center"
align=3D"center"><span=
style=3D"color:black">
<hr size=3D"2" width=3D"100%" align=3D"center">
</span></div>
<p class=3D"MsoNormal"><span style=3D"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.UIPluginDataP=
ath</em> enum option ("UIPluginDataPath" in
<i>vdc_options</i> table), and resolved relative to
<i>ConfigValues.DataDir=
</i> if possible. Following (default) values:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<i>UIPluginDataPath =3D ui-plugins</i></li><li
class=3D"MsoNormal" style=3D=
"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0=
level1 lfo3">
<i>DataDir =3D /usr/share/ovirt-engine</i></li></ul>
<p class=3D"MsoNormal"><span style=3D"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.UIPluginConf=
igPath</i> enum option ("UIPluginConfigPath" in
<i>vdc_options</i> table), and resolved relative to
<i>ConfigValues.ConfigD=
ir</i> if possible. Following (default) values:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l3 level1 lfo4">
<i>UIPluginConfigPath =3D ui-plugins</i></li><li
class=3D"MsoNormal" style=
=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list=
:l3 level1 lfo4">
<i>ConfigDir =3D /etc/ovirt-engine</i></li></ul>
<p><span style=3D"color:black">result in UI plugin config path:
<i>/etc/ovi=
rt-engine/ui-plugins</i></span></p>
<p class=3D"MsoNormal"><span style=3D"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 a=
nd caching UI plugin descriptor/configuration data on the server (Engine). =
It has two main responsibilities:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l2 level1 lfo5">
return a snapshot of currently valid plugin data (<i>getCurrentData</i> met=
hod)</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo5">
reload plugin data from local file system if necessary (<i>reloadData</i> m=
ethod)</li></ul>
<p><span style=3D"color:black">The <i>reloadData</i>
method doesn't modify =
"live" plugin data directly. Instead, it creates a local working copy of cu=
rrent plugin data, updates this copy as it reads/validates plugin descripto=
r 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).</spa=
n></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">In other words,
<i>reloadData</i> method mak=
es 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> read=
s and writes):</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l4 level1 lfo6">
In the best case, a thread will succeed in updating "live" data
(<i>AtomicR=
eference.compareAndSet</i> =3D=3D true), which means that "live" data
remai=
ned unchanged since this thread acquired a reference of current plugin data=
.</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;=
mso-margin-bottom-alt:auto;mso-list:l4 level1 lfo6">
In the worst case, a thread will NOT succeed in updating "live" data
(<i>At=
omicReference.compareAndSet</i> =3D=3D false), which means that "live"
data=
was already changed by another thread since this thread acquired a referen=
ce of current plugin data.</li></ul>
<p><span style=3D"color:black">In my opinion, when dealing with
external re=
sources like the local file system, this is a good compromise between perfo=
rmance 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 hum=
ble) opinion, the benefit of having "completely-up-to-date" data, at the co=
st of reduced performance, is not really worth it, especially in our case w=
hen the user can just hit refresh
(F5) to reload WebAdmin and its plugin data.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><u><span style=3D"color:black">Plugin descriptor
files</span></u><span s=
tyle=3D"color:black"> are expected to be placed in UI plugin data path, for=
example:
<i>/usr/share/ovirt-engine/ui-plugins/foo.json</i></span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Following descriptor file attributes
are imp=
lemented and recognized by the plugin infrastructure:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l10 level1 lfo7">
<i>name</i>: A name that uniquely identifies the plugin (required attribute=
).</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto;mso-list:l10 level1 lfo7">
<i>url</i>: URL of plugin host page that invokes the plugin code (required =
attribute).</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level1 lfo7">
<i>config</i>: Default configuration object associated with the plugin (opt=
ional attribute).</li><li class=3D"MsoNormal"
style=3D"color:black;mso-marg=
in-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l10 level1 lfo7">
<i>resourcePath</i>: Path to plugin static resources, relative to UI plugin=
data path (optional attribute). This is used when serving plugin files thr=
ough Engine
<i>PluginResourceServlet</i> (more on this below).</li></ul>
<p><u><span style=3D"color:black">Plugin configuration
files</span></u><spa=
n style=3D"color:black"> are expected to be placed in UI plugin config path=
, for example:
<i>/etc/engine/ui-plugins/foo-config.json</i></span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Note that plugin configuration files
follow =
the "<descriptorFileName>-config.json"
convention.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">Following configuration file
attributes are =
implemented and recognized by the plugin infrastructure:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l9 level1 lfo8">
<i>config</i>: Custom configuration object associated with the plugin (opti=
onal attribute). This overrides the default plugin descriptor configuration=
, if any.</li><li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto;mso-list:l9 level1 lfo8">
<i>enabled</i>: Indicates whether the plugin should be loaded on WebAdmin s=
tartup (optional attribute). Default value is 'true'.</li><li
class=3D"MsoN=
ormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:a=
uto;mso-list:l9 level1 lfo8">
<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).</li></ul>
<p><span style=3D"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 configur=
ation quite flexible - in my opinion, the added complexity of handling/merg=
ing such configuration is definitely worth the effort.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">The <i>enabled</i>
attribute is straight-for=
ward, allowing users to turn the given plugin off, if necessary. In future,=
users should still be able to load such plugins through WebAdmin GUI.</spa=
n></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">The <i>order</i>
attribute controls the orde=
r in which plugins are loaded on WebAdmin startup. Since plugin resources a=
re fetched asynchronously by the browser, this is basically a way of imposi=
ng some degree of determinism in the
"generally-non-deterministic" plugin environment, which is helpful when tr=
oubleshooting problems with multiple plugins. This attribute is also helpfu=
l 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-<descriptorFile=
Name>.json" convention, with NN being the order
number).</span></p>
<p class=3D"MsoNormal"><span style=3D"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>:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l8 level1 lfo9">
reloads descriptor/configuration data from local file system if necessary, =
and obtains a snapshot of currently valid plugin data (<i>PluginDataManager=
.reloadAndGetCurrentData</i>)</li><li class=3D"MsoNormal"
style=3D"color:bl=
ack;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l8 level1 l=
fo9">
embeds all plugin meta-data, suitable for use in client-side plugin infrast=
ructure, into WebAdmin host page as "pluginDefinitions" JavaScript array (<=
i>PluginDefinitions</i>)</li></ul>
<p class=3D"MsoNormal"><span style=3D"color:black">As a
result, reloading U=
I plugin descriptor/configuration data is as simple as refreshing (F5) WebA=
dmin 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 sy=
stem.<br>
<br>
For example, requesting URL:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l5 level1 lfo10">
<i><a>http://<EngineManagerHost>:8700/webadmin/webadmin/plugin/foo/co=
ntent/start.html</a></i></li></ul>
<p><span style=3D"color:black">will send the content
of:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level1 lfo11">
<i>/usr/share/ovirt-engine/ui-plugins/<resourcePath>/content/start.ht=
ml</i></li></ul>
<p><span style=3D"color:black">to the
client.</span></p>
<p><span style=3D"color:black"> </span></p>
<p><span style=3D"color:black">As shown in the above
example:</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l12 level1 lfo12">
<i>/webadmin/webadmin/plugin/</i> is the servlet root path for
<i>PluginRes=
ourceServlet</i></li><li class=3D"MsoNormal"
style=3D"color:black;mso-margi=
n-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l12 level1 lfo12">
in the extra path beyond the servlet root path (<i>/foo/content/start.html<=
/i>):</li></ul>
<ul type=3D"disc">
<ul type=3D"circle">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l12 level2 lfo12">
<i>/foo</i> represents the name of the plugin</li><li
class=3D"MsoNormal" s=
tyle=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-=
list:l12 level2 lfo12">
<i>/content/start.html</i> represents the path to requested resource, relat=
ive to "UIPluginDataPath / <resourcePath>"</li></ul>
</ul>
<p class=3D"MsoNormal"><span style=3D"color:black">Note
that each plugin us=
ing <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>WebadminDynamicHosti=
ngServlet</i>, does NOT reload descriptor/configuration data from local fil=
e system as part of handling the given request. In other words, it's assume=
d that plugin data has already been
(re)loaded when serving WebAdmin application host page, with subsequent re=
quests to
<i>PluginResourceServlet</i> reading the current plugin
information.<br>
<br>
Until we solve the cross-origin issue in a clean way, <i>PluginResourceServ=
let</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 u=
ncaught exceptions to escape from plugin event handler functions (e.g. "UiI=
nit"):</span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal"
style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l6 level1 lfo13">
removed state <i>INITIALIZED</i></li><li
class=3D"MsoNormal" style=3D"color=
:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level=
1 lfo13">
added state <i>INITIALIZING</i>: The plugin is (currently) being initialize=
d by calling UiInit event handler function.</li><li class=3D"MsoNormal"
sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l6 level1 lfo13">
added state <i>IN_USE</i>: Plugin's UiInit event handler function has
compl=
eted successfully, we can now call other event handler functions as necessa=
ry. The plugin is in use now.</li><li class=3D"MsoNormal"
style=3D"color:bl=
ack;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l6 level1 l=
fo13">
added state <i>FAILED</i>: An uncaught exception escaped while calling an e=
vent handler function, which indicates internal error within the plugin cod=
e. The plugin is removed from service.</li></ul>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"color:=
black">I've attached a simple state diagram that illustrates different stat=
es 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 ha=
ndled 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. Ot=
herwise, plugin code running in the context of an iframe'd host page will f=
ail to evaluate "parent.pluginApi" expression, with "parent" being
top-leve=
l (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, shoul=
d 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
t=
han Engine (REST API). In future, we'll address this with Apache reverse pr=
oxy configuration, so that users
can configure Apache server (placed in front of Engine JBoss AS) to put ar=
bitrary (local or remote non-Engine) services on same origin. However, this=
requires a change in current Apache configuration. Until then, users can m=
anually edit the Engine Apache configuration
file (<i>/etc/httpd/conf.d/ovirt-engine.conf</i>).</span></p>
<div class=3D"MsoNormal" style=3D"text-align:center"
align=3D"center"><span=
style=3D"color:black">
<hr size=3D"2" width=3D"100%" align=3D"center">
</span></div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span
style=3D"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 pa=
tch to oVirt Gerrit:
<a href=3D"http://gerrit.ovirt.org/8120"
target=3D"_blank">http://gerrit.ov=
irt.org/8120</a<br>
<br>
Let me know what you think!<br>
<br>
Cheers,<br>
Vojtech</span></p>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span
style=3D"color:black"><ui-plugin-sample-fil=
es.tar.gz></span></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span
style=3D"color:black"><ui-plugin-lifecycle.=
png></span></p>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span
style=3D"color:black">________________________=
_______________________<br>
Engine-devel mailing list<br>
<a href=3D"mailto:Engine-devel@ovirt.org"
target=3D"_blank">Engine-devel@ov=
irt.org</a<br>
<a
href=3D"http://lists.ovirt.org/mailman/listinfo/engine-devel" target=3D"=
_blank">http://lists.ovirt.org/mailman/listinfo/engine-devel</...
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><span
style=3D"color:black"> </span></p>
</div>
</div>
</div><br></div></body></html>
------=_Part_4133380_10286535.1349259508244--
4229
days inactive
4230
days old
4 comments
3 participants
participants (3)
-
Juan Hernandez -
Morrissey, Christopher -
Vojtech Szocs