[Openstack] [RFC] OpenStack API

John Purrier john at openstack.org
Tue Jan 4 19:02:25 UTC 2011

Good points, I just deleted my post as you made my points J.


The “devAPI” is valuable for developers/contributors to the OpenStack services for all of the reasons Vishy stated in terms of immediacy, access, and easy evolution. This should be internal to the project. Having a CLI to drive this is a good thing.


The “OpenStack API” is targeted at developers that consume the published services (such as provisioning VM’s, Virtual Volumes, Virtual Images, Virtual Networks, and Object Storage). These can also be thought of as OpenStack application developers and sysadmins. Having a CLI that can be scripted against is a good thing. For this audience there is likely a requirement in the API stack for orchestration, transactions, and  concurrency that will not be exposed through a low level devAPI.




From: openstack-bounces+john=openstack.org at lists.launchpad.net [mailto:openstack-bounces+john=openstack.org at lists.launchpad.net] On Behalf Of ksankar at doubleclix.net
Sent: Tuesday, January 04, 2011 12:37 PM
To: Vishvananda Ishaya
Cc: openstack at lists.launchpad.net
Subject: Re: [Openstack] [RFC] OpenStack API


Good point - this was my concern on "REST API for developers" in the other thread. Relative stability, versioning, published API and programming models that need to be supported and deprecated systemically and so forth. Plus evolutionay concerns like extensibility, feature velocity, ... 


Before we even think of devAPi vs internal API, we need to be crisp and clear on "For Whom the APIs toll" ...


a)    Developers who develop service components <- Need access to all internals and will use python

b)    Cloud Platform developers who develop granular services based on the service components <- Are these the clients we are talking about ? Do they need a concise programming model and REST API ? If so, what would these actors do ?


If there are two distinct constituents, with clear cut requirements and interfaces, we can work through programming models and appropriate APIs. 




-------- Original Message --------
Subject: Re: [Openstack] [RFC] OpenStack API
From: Vishvananda Ishaya <vishvananda at gmail.com>
Date: Tue, January 04, 2011 9:32 am
To: Ed Leafe <ed at leafe.com>
Cc: openstack at lists.launchpad.net

Sure. DevAPI perhaps?

Another point that might help clarify: Each component of Nova exposes an "api" to the other components in the system via python methods. You could refer to these as the "internal api" for that component. Both the OS api and the EC2 api use this internal api, for example, when they are running instance related commands. DevAPI (ReflectionAPI/EasyAPI) takes the "internal api" from all of the components and sews them up into a rest interface so they can be accessed via the cli. I think this is the "best" way for developers to prototype components and interact with the system. This is probably not the best way for clients to access the system. The "official" api exposed to clients needs to be a bit more rigorous with versioning, etc. and can lag behind the internal/dev api. The Openstack/Rackspace can continue to be the current versioned official api.

I think this division gives both developers and end users their optimal use case.


On Jan 4, 2011, at 5:57 AM, Ed Leafe wrote:

> On Jan 3, 2011, at 8:32 PM, Vishvananda Ishaya wrote:
>> I feel very strongly that we need to keep the code easy to extend and prototype, without forcing developers to go through the process of api specs and versioning. I don't think this is going to happen through the OpenStack/Rackspace api, due to the reasons outlined above. The idea of EasyAPI is simply to expose the existing apis that we have for each component for easy consumption. This allows us to have a simple command line utility to interact with the code we write for each component separately.
> Is there any chance that you could change the name to something that sounds a little less judgmental? I.e., if it's not EasyAPI, it must be DifficultAPI! Maybe ReflectionAPI or something that describes the approach and not an opinion.
> -- Ed Leafe

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