On 15/02/2013 20:11, Vojtech Szocs wrote:
Hi Libor,
I would like to ask, if there have been discussions about an option to
call REST API services directly from the Frontend (GWT layer)? GWT
compiles Java frontend-side to Javascript, calls to backend services
are performed "transparently" by the framework using AJAX support.
But, there is still a need to have a special set of data objects and
the server-side logic can duplicate.
Indeed, for both WebAdmin and UserPortal, we're planning to move away from GWT
RPC (a.k.a Generic API) and use Engine REST API and promote loose coupling
between client and server.
As Chris mentioned, for WebAdmin UI plugins, there's already support for
calling Engine REST API - session ID is obtained upon WebAdmin UI login and
passed to all UI plugins. It's up to plugin authors to decide if the plugin
itself (JavaScript) will communicate via REST API, or if the plugin passes the
session ID to some other server so that the other server does REST API
communication.
Java REST API SDK enables to build "thick" client. The calls are
realized using e.g. Apache HttClient and supported libraries. I think
the requirements of GWT can be a little bit different, but something
overlaps.
Well, we can't really use Java REST API SDK directly due to restrictions
imposed by GWT on client-side code, e.g. HttClient uses sockets which are
(obviously) not supported in JavaScript and therefore related classes are
rejected by GWT compiler.
What we're planning to do is to map REST API XML responses to generated "REST API
Types" (based on api.xsd schema) and vice versa. This could be a bit of challenge,
as most frameworks for GWT REST API support use JSON representation in favor of XML.
JSON is also more efficient than XML, but will take a bit of time until
supported by the REST API.
Vojtech
----- Original Message -----
From: "Christopher Morrissey" <christopher.morris...@netapp.com>
To: "Keith Robertson" <krobe...@redhat.com>, "Libor Spevak" <lspe...@redhat.com>
Cc: engine-devel@ovirt.org
Sent: Tuesday, February 12, 2013 11:53:52 PM
Subject: Re: [Engine-devel] REST API calls from the GUI
The UI plugin framework already makes a session ID available for REST API
calls. Oved's blog gives a good description with some example code.
http://ovedou.blogspot.co.il/2012/12/ovirt-foreman-ui-plugin.html
-Chris
-----Original Message-----
From: engine-devel-boun...@ovirt.org [mailto:engine-devel-
boun...@ovirt.org] On Behalf Of Keith Robertson
Sent: Tuesday, February 12, 2013 11:30 AM
To: Libor Spevak
Cc: engine-devel@ovirt.org
Subject: Re: [Engine-devel] REST API calls from the GUI
Not sure if this is possible now but, I would like the front-end to expose an
authenticated hook to the API so that plug-ins can call RESTful methods. It
would enable plug-in writers to do all sorts of interesting things in their
plug-
ins with the RESTful API.
Cheers,
Keith
On 02/12/2013 11:13 AM, Libor Spevak wrote:
Hi,
I would like to ask, if there have been discussions about an option to
call REST API services directly from the Frontend (GWT layer)? GWT
compiles Java frontend-side to Javascript, calls to backend services
are performed "transparently" by the framework using AJAX support.
But, there is still a need to have a special set of data objects and
the server-side logic can duplicate.
Java REST API SDK enables to build "thick" client. The calls are
realized using e.g. Apache HttClient and supported libraries. I think
the requirements of GWT can be a little bit different, but something
overlaps.
I found several links about REST API support from GWT, so there is
something for inspiration...
- http://www.spiffyui.org/
- http://www.zackgrossbart.com/hackito/gwt-rest/
- http://code.google.com/p/gwt-rest/
- http://restygwt.fusesource.org/
But, do you think it would be useful and what drawbacks can occur
(authentication, authorization, response times, need to support larger
set of services, painful refactoring, ...)?
Regards,
Libor
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