def add_tunnel_endpoint(ip, max_retries=10):
"""Return the endpoint of the given IP address or generate a new one."""
# NOTE(rpodolyaka): generation of a new tunnel endpoint must be put into a
# repeatedly executed transactional block to ensure it
# doesn't conflict with any other concurrently executed
# DB transactions in spite of the specified transactions
# isolation level value
for i in xrange(max_retries):
LOG.debug(_('Adding a tunnel endpoint for %s'), ip)
try:
session = db.get_session()
with session.begin(subtransactions=True):
tunnel = (session.query(
ovs_models_v2.TunnelEndpoint).filter_by(
ip_address=ip).with_lockmode('update').first())
if tunnel is None:
tunnel_id = _generate_tunnel_id(session)
tunnel = ovs_models_v2.TunnelEndpoint(ip, tunnel_id)
session.add(tunnel)
return tunnel
except db_exc.DBDuplicateEntry:
# a concurrent transaction has been committed, try again
LOG.debug(
_('Adding a tunnel endpoint failed due to a concurrent'
'transaction had been committed (%s attempts left)'),
max_retries - (i + 1))
raise q_exc.NeutronException(
message=_('Unable to generate a new tunnel id'))
def test_add_tunnel_endpoint_retrieve_an_existing_endpoint(self):
addr = '10.0.0.1'
self.session.add(ovs_models.TunnelEndpoint(ip_address=addr, id=1))
self.session.flush()
tunnel = ovs_db_v2.add_tunnel_endpoint(addr)
self.assertEqual(tunnel.id, 1)
self.assertEqual(tunnel.ip_address, addr)
def add_tunnel_endpoint(ip):
session = db.get_session()
try:
tunnel = (session.query(ovs_models_v2.TunnelEndpoint).filter_by(
ip_address=ip).with_lockmode('update').one())
except exc.NoResultFound:
tunnel_id = _generate_tunnel_id(session)
tunnel = ovs_models_v2.TunnelEndpoint(ip, tunnel_id)
session.add(tunnel)
session.flush()
return tunnel
