The callback modules have been available in neutron-lib since commit [1]
and are ready for consumption.
As the callback registry is implemented with a singleton manager
instance, sync complications can arise ensuring all consumers switch to
lib's implementation at the same time. Therefore this consumption has
been broken down:
1) Shim neutron's callbacks using lib's callback system and remove
existing neutron internals related to callbacks (devref, UTs, etc.).
2) Switch all neutron's callback imports over to neutron-lib's.
3) Have all sub-projects using callbacks move their imports over to use
neutron-lib's callbacks implementation.
4) Remove the callback shims in neutron-lib once sub-projects are moved
over to lib's callbacks.
5) Follow-on patches moving our existing uses of callbacks to the new
event payload model provided by neutron-lib.callback.events
This patch implements #1 from above, shimming neutron's callbacks and
removing devref + UTs. Rather than shimming using debtcollector, this
patch leaves callback constants as-is, and simply references the lib
class/function in its respective neutron callback module. This allows
consumers to test callback types without changing code. For example,
an except block block like that below continues to work even though
the raised exception now lives in lib::
try:
neutron_cb_registry.notify(...)
except neutron_cb_exceptions.CallbackFailure:
handle_exception()
In addition this patch contains minor UT updates to support the shim
approach.
NeutronLibImpact
[1] fea8bb64ba7ff52632c2bd3e3298eaedf623ee4f
Change-Id: Ib6baee2aaeb044aaba42a97b35900d75dd43021f
d79798389e