Hi Irena,
Irena Berezovsky :
> I would like to second Kevin. This can be done in a similar way as
ML2 Plugin passed plugin_context
> to ML2 Extension Drivers:
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/driver_api.py#L910.
Yes, this would be similar and could indeed be named agent_context .
However, contrarily to ML2 plugin which provides a context when calling
most driver methods, I don't think that here we would need a context to
be passed at each call of an AgentCoreResourceExtension, providing a
interface to hook to the agent at initialize seems enough to me.
Thanks,
-Thomas
On Fri, Sep 25, 2015 at 11:57 AM, Kevin Benton <blak...@gmail.com
<mailto:blak...@gmail.com>> wrote:
I think the 4th of the options you proposed would be the best. We
don't want to give agents direct access to the agent object or else
we will run the risk of breaking extensions all of the time during
any kind of reorganization or refactoring. Having a well defined API
in between will give us flexibility to move things around.
On Fri, Sep 25, 2015 at 1:32 AM, <thomas.mo...@orange.com
<mailto:thomas.mo...@orange.com>> wrote:
Hi everyone,
(TL;DR: we would like an L2 agent extension to be able to call
methods on the agent class, e.g. OVSAgent)
In the networking-bgpvpn project, we need the reference driver
to interact with the ML2 openvswitch agent with new RPCs to
allow exchanging information with the BGP VPN implementation
running on the compute nodes. We also need the OVS agent to
setup specific things on the OVS bridges for MPLS traffic.
To extend the agent behavior, we currently create a new agent by
mimicking the main() in ovs_neutron_agent.py but instead of
instantiating instantiate OVSAgent, with instantiate a class
that overloads the OVSAgent class with the additional behavior
we need [1] .
This is really not the ideal way of extending the agent, and we
would prefer using the L2 agent extension framework [2].
Using the L2 agent extension framework would work, but only
partially: it would easily allos us to register our RPC
consumers, but not to let us access to some
datastructures/methods of the agent that we need to use:
setup_entry_for_arp_reply and local_vlan_map, access to the
OVSBridge objects to manipulate OVS ports.
I've filled-in an RFE bug to track this issue [5].
We would like something like one of the following:
1) augment the L2 agent extension interface
(AgentCoreResourceExtension) to give access to the agent object
(and thus let the extension call methods of the agent) by giving
the agent as a parameter of the initialize method [4]
2) augment the L2 agent extension interface
(AgentCoreResourceExtension) to give access to the agent object
(and thus let the extension call methods of the agent) by giving
the agent as a parameter of a new setAgent method
3) augment the L2 agent extension interface
(AgentCoreResourceExtension) to give access only to
specific/chosen methods on the agent object, for instance by
giving a dict as a parameter of the initialize method [4], whose
keys would be method names, and values would be pointer to these
methods on the agent object
4) define a new interface with methods to access things inside
the agent, this interface would be implemented by an object
instantiated by the agent, and that the agent would pass to the
extension manager, thus allowing the extension manager to passe
the object to an extension through the initialize method of
AgentCoreResourceExtension [4]
Any feedback on these ideas...?
Of course any other idea is welcome...
For the sake of triggering reaction, the question could be
rephrased as: if we submit a change doing (1) above, would it
have a reasonable chance of merging ?
-Thomas
[1]
https://github.com/openstack/networking-bgpvpn/blob/master/networking_bgpvpn/neutron/services/service_drivers/bagpipe/ovs_agent/ovs_bagpipe_neutron_agent.py
[2] https://review.openstack.org/#/c/195439/
[3]
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/extension_drivers/qos_driver.py#L30
[4]
https://github.com/openstack/neutron/blob/master/neutron/agent/l2/agent_extension.py#L28
[5] https://bugs.launchpad.net/neutron/+bug/1499637
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