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I think the protocols should be an open set and each lbass driver will have to declare the members of this set.
However when you create a VIP you do not know yet which driver will be selected by the lbass "engine", so maybe the protocol passed by the client can be used as another hint for driver selection.
Avishay

-----Original Message-----
From: Roman Prykhodchenko [mailto:rprikhodchenko at mirantis.com] 
Sent: Wednesday, January 23, 2013 4:31 PM
To: OpenStack Development Mailing List
Subject: [openstack-dev] [Quantum] [LBaaS]Issues with supported protocols for VIPs and Pools

Hi folks,

Recently I discovered that it's impossible to specify TCP protocol when creating a VIP. After I started fixing that issue I found out that the problem is a little bit deeper and requires some assistance of the community to solve it.
Currently it's impossible to specify TCP protocol when creating a VIP because only HTTP and HTTPS values are supported. However, you can create a Pool and supply any string value for it's protocol.

It's not too hard to add some constraints to the DB schema and to the REST API. The problem is that we do not know what protocols will be supported by the drivers and also we cannot predict that. I can see 3 possible solutions:
1. Get rid of validation to allow specifying any value. This is not foolproof at all but provides the biggest flexibility.
2. Modify the schema  and the API to support all basic protocols (HTTP, HTTPS, TCP, UDP, IP). This is foolproof but may cause a problem in the case when someone needs something extraordinary.
3. Poll all configured drivers and add all supported protocols to the API. This will allow to have something extraordinary configured but we can only add constraints to the API but not to the database schema.

So, what do you think about this issue?


- Roman Prykhodchenko


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