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Re: Easy API
Thanks for the reply,
I have to confess that I'm still concerned about the idea of yet another API for several reasons.
* While I appreciate the idea of a compatibility layer of sorts, we already have a weird digression in available features between Amazon and Openstack. I think a 3rd API that also isn't finished will lead to more confusion than anything else, especially since the Openstack API is named to imply that it's official.
* Couldn't we just add a reflection API to the OS API and gain many of the same benefits you list?
* Stack doesn't seem to solve the binding problem for people that want to programatically interact with Openstack. As such, this means more API bindings, and I don't think reflection helps with much of anything in that regard. More specifically, said bindings will still either be written with explicit needs in mind or as a crack at being wholly comprehensive. http://bitworking.org/news/193/Do-we-need-WADL articulates this better than I can.
* Presumably EasyAPI will also be incomplete/unstable through at least Cactus. Doesn't this just add to the problem that drove you to create EasyAPI in the first place?
* I think the hackability idea is sound, with the caveat that I don't really see how this implementation actually solves that issue any better than the existing code base. With a small amount of effort, we can extend the OS API to be highly modular.
I do want to mention that at no point was the OS API, in it's current incarnation, intended to be the do-all/be-all. We're simply making a first pass for parity, and then follow-up passes to make it awesome :-)
From: Andy Smith <andyster@xxxxxxxxx<mailto:andyster@xxxxxxxxx>>
Date: Wed, 29 Dec 2010 12:08:29 -0800
To: Matt Dietz <matt.dietz@xxxxxxxxxxxxx<mailto:matt.dietz@xxxxxxxxxxxxx>>
Cc: Jesse Andrews <jesse@xxxxxxxxxxxx<mailto:jesse@xxxxxxxxxxxx>>, termie <launchpad@xxxxxxxxxxxxxx<mailto:launchpad@xxxxxxxxxxxxxx>>, Sandy Walsh <sandy.walsh@xxxxxxxxxxxxx<mailto:sandy.walsh@xxxxxxxxxxxxx>>, <openstack@xxxxxxxxxxxxxxxxxxx<mailto:openstack@xxxxxxxxxxxxxxxxxxx>>
Subject: Re: Easy API
On Wed, Dec 29, 2010 at 12:06 PM, Andy Smith <andyster@xxxxxxxxx<mailto:andyster@xxxxxxxxx>> wrote:
I was intending on writing an email to the mailing list about it (so I'll just CC it), was just going over tone with the Anso team first since I tend to come off a bit antagonistic.
The short summary is that we wanted to return "hackability" to the project, as developers the move towards API compatibility has slowly removed most of the tools we had in place to test out new features as they were being worked on, so in that way the reflection api, self-registration of services, command-line tool and general simplicity (you can explain how everything works in just a few sentences) are a solution.
Part of that hackability also meant hackability for third-parties, we wanted developers to be able to add functionality to Nova without having to go through the Nova review process and even be able package that functionality separately, this is an obvious goal for any large entity using openstack internally where they have additional changes to make to customize their deployment.
Easy API makes up a good basis for extensibility of the project over time.
The existing APIs are still necessary to serve their purpose which is translating the intents defined by existing specifications/implementations to tasks that make sense for Nova, and should it be desirable those interfaces can easily be built on top of and decoupled (due to the delegated auth pattern) from the Easy API, the EasyCloudTestCase gives a decent example of how such a thing could be done.
In my personal opinion I see the two existing API implementations as 'compatibility' APIs where as Easy API is a direct API and much easier to understand because of it.
The relevant blueprint (read the spec, obvs): https://blueprints.launchpad.net/nova/+spec/easy-api
On Wed, Dec 29, 2010 at 11:20 AM, Matt Dietz <matt.dietz@xxxxxxxxxxxxx<mailto:matt.dietz@xxxxxxxxxxxxx>> wrote:
I was wondering if you could answer a few questions? I get the argument that EC2 and eucatools suck, and that the OS API is incomplete/unstable. What prompted you starting down the Easy API path? Subsequently, what issues are you hoping to solve with it? From what I can see, it's the WADL-like/reflection interface that seems to be the driving force. Is this correct?
I'm curious mostly because a lot of effort has been expended with the goal of making the existing OS API the canonical one. I'm fine with a better effort, but I've been operating in accordance with the internal goal of making it work 100% like the Rackspace API so all existing bindings will "just work" if someone cares to try out Openstack. Obviously we can't continue working on parallel paths because we'll just end up fracturing the API user-base until we can decide which API is going to stick.
I'd like to get the discussion started, and I'll be glad to take it to the blueprint (since I see you made one as of 18 hours ago) or IRC.
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