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+1 for option 2. 

In addition as an additional safeguard, the LBaaS service could check with Barbican when failing to use an existing secret to see if the secret has changed (lazy detection).  

Youcef

-----Original Message-----
From: Jorge Miramontes [mailto:jorge.miramontes at RACKSPACE.COM] 
Sent: Friday, June 06, 2014 12:16 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [Neutron][LBaaS] Barbican Neutron LBaaS Integration Ideas

Hey everyone,

Per our IRC discussion yesterday I'd like to continue the discussion on how Barbican and Neutron LBaaS will interact. There are currently two ideas in play and both will work. If you have another idea please free to add it so that we may evaluate all the options relative to each other.
Here are the two current ideas:

1. Create an eventing system for Barbican that Neutron LBaaS (and other
services) consumes to identify when to update/delete updated secrets from Barbican. For those that aren't up to date with the Neutron LBaaS API Revision, the project/tenant/user provides a secret (container?) id when enabling SSL/TLS functionality.

* Example: If a user makes a change to a secret/container in Barbican then Neutron LBaaS will see an event and take the appropriate action.

PROS:
 - Barbican is going to create an eventing system regardless so it will be supported.
 - Decisions are made on behalf of the user which lessens the amount of calls the user has to make.

CONS:
 - An eventing framework can become complex especially since we need to ensure delivery of an event.
 - Implementing an eventing system will take more time than option #2ŠI think.

2. Push orchestration decisions to API users. This idea comes with two assumptions. The first assumption is that most providers' customers use the cloud via a GUI, which in turn can handle any orchestration decisions that need to be made. The second assumption is that power API users are savvy and can handle their decisions as well. Using this method requires services, such as LBaaS, to "register" in the form of metadata to a barbican container.

* Example: If a user makes a change to a secret the GUI can see which services are registered and opt to warn the user of consequences. Power users can look at the registered services and make decisions how they see fit.

PROS:
 - Very simple to implement. The only code needed to make this a reality is at the control plane (API) level.
 - This option is more loosely coupled that option #1.

CONS:
 - Potential for services to not register/unregister. What happens in this case?
 - Pushes complexity of decision making on to GUI engineers and power API users.


I would like to get a consensus on which option to move forward with ASAP since the hackathon is coming up and delivering Barbican to Neutron LBaaS integration is essential to exposing SSL/TLS functionality, which almost everyone has stated is a #1/#2 priority.

I'll start the decision making process by advocating for option #2. My reason for choosing option #2 has to deal mostly with the simplicity of implementing such a mechanism. Simplicity also means we can implement the necessary code and get it approved much faster which seems to be a concern for everyone. What option does everyone else want to move forward with?



Cheers,
--Jorge


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