[ovirt-devel] [vdsm][mom][jsonrpc] new VDSM interface for MOM

[Piotr Kliczewski]

On Thu, May 14, 2015 at 3:28 PM, Adam Litke <alitke at redhat.com> wrote:
> On 13/05/15 22:53 +0200, Piotr Kliczewski wrote:
>>
>> On Wed, May 13, 2015 at 9:52 PM, Adam Litke <alitke at redhat.com> wrote:
>>>
>>> On 11/05/15 04:28 -0400, Francesco Romani wrote:
>>>>
>>>>
>>>> Hi everyone,
>>>>
>>>> I'm working to brush up and enhance my old hack
>>>> https://gerrit.ovirt.org/#/c/37827/1
>>>>
>>>> That patch adds a new MOM interface, to talk with VDSM using the RPC
>>>> interface.
>>>> On top of that, I want to make efficient use of VDSM API (avoid
>>>> redundant
>>>> call, possibly
>>>> issuing only one getAllVmStats call and caching the results, and so
>>>> forth)
>>>>
>>>> Next step will be to backport optimizations to current vdsmInterface.
>>>> Or maybe, even replacing the new vdsminterface with the new one I'm
>>>> developing :)
>>>>
>>>> I'd like to use the blessed JSON-RPC interface, but what's the
>>>> recommended
>>>> way to
>>>> do that? What is (or will be!) the official recommended VDSM external
>>>> client interface?
>>>>
>>>> I thought about patch https://gerrit.ovirt.org/#/c/39203/
>>>>
>>>> But my _impression_ is that patch will depend on VDSM's internal
>>>> reactor,
>>>> thus is not very
>>>> suitable to be used into an external process.
>>>
>>>
>>>
>>> I've written my own extremely crude client using the stomp library.
>>> Nir also has a patch [1] on gerrit to do this.  Maybe he can provide
>>> some insight.  It'd be nice if the vdsm-yajsonrpc package could
>>> provide a full-featured client class that could be easily integrated
>>> into projects like MOM.
>>>
>>
>> I will try to provide simple client for people to use.
>
>
> Thanks Piotr!  I'm sure you can come up with a much more  elegant way
> to stitch the existing classes together to do what we need.
>

I posted a patch [1] with simplified way of building stomp client. It works in
sync and async way. Can you please take a look and tell me whether it
is OK or you want me to make more improvements.

It is important to have it usable.

[1] https://gerrit.ovirt.org/#/c/42850

> --
> Adam Litke