Hi all,
I'm developing a new mechanism driver. I'd like to access ml2-related tables in
create_port_precommit and create_port_postcommit. However I find it hard to do
that because the two functions are both inside an existed database transaction
defined in create_port function of ml2/plugin.py.
The related code is as follows:
def create_port(self, context, port):
...
session = context.session
with session.begin(subtransactions=True):
...
self.mechanism_manager.create_port_precommit(mech_context)
try:
self.mechanism_manager.create_port_postcommit(mech_context)
...
...
return result
As a result, I need to carefully deal with the database nested transaction
issue to prevent from db lock when I develop my own mechanism driver. Right
now, I'm trying to get the idea behind the scene. Is it possible to refactor it
in order to make precommit and postcommit out of the db transaction? I think it
is perfect for those who develop mechanism driver and do not know well about
the functioning context of the whole ML2 plugin.
Thanks,
Li Ma
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