Allow ml2 drivers to start their own RPC listeners#66
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To allow MechanismDrivers to start their own RPC listeners (e.g. for communication with custom agents) the MechanismManager will now call start_rpc_listeners() of each driver. This is done as part of Ml2Plugin.start_rpc_listeners(). It is added as an alternative to create the backends in initialize(), as in cases where a driver is split up into the API and RPC part we want to make sure these backends are only started in the RPC part of neutron. This patch depends on MechanismDrivers.start_rpc_listeners() in neutron-lib[0]. [0] https://review.opendev.org/c/openstack/neutron-lib/+/919589 Change-Id: I31e253180f474abf6d266d23c50f9dc89f17f687 Depends-On: https://review.opendev.org/c/openstack/neutron-lib/+/919589 Closes-Bug: #2065198
We do not need to call start_rpc_workers() to start the rpc listeners of our ml2 drivers, as these are now started via start_rpc_listeners(), which is called from within Ml2Plugin's own start_rpc_listeners() method. All drivers that rely on their listeners to be started via get_workers() and do not have a proper start_rpc_listeners() method will need to implement one, but as most use get_workers() to just call their own start_rpc_listeners() there shouldn't be much to be done on the driver's side. This reverts commit b2376f8.
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This is a backport of a proposed commit to upstream (which is not yet merged there). We also revert the original patch which starts workers in our neutron-rpc-servers (which we did as a crutch to start rpc listeners our ml2 drivers needed), as this is now done via the Ml2Plugin. For details, see the individual commit messages.