def _create_dvr_mac_address(self, context, host):
"""Create DVR mac address for a given host."""
base_mac = cfg.CONF.dvr_base_mac.split(':')
max_retries = cfg.CONF.mac_generation_retries
for attempt in reversed(range(max_retries)):
try:
with context.session.begin(subtransactions=True):
mac_address = utils.get_random_mac(base_mac)
dvr_mac_binding = DistributedVirtualRouterMacAddress(
host=host, mac_address=mac_address)
context.session.add(dvr_mac_binding)
LOG.debug(
"Generated DVR mac for host %(host)s "
"is %(mac_address)s", {
'host': host,
'mac_address': mac_address
})
dvr_macs = self.get_dvr_mac_address_list(context)
# TODO(vivek): improve scalability of this fanout by
# sending a single mac address rather than the entire set
self.notifier.dvr_mac_address_update(context, dvr_macs)
return self._make_dvr_mac_address_dict(dvr_mac_binding)
except db_exc.DBDuplicateEntry:
LOG.debug(
"Generated DVR mac %(mac)s exists."
" Remaining attempts %(attempts_left)s.", {
'mac': mac_address,
'attempts_left': attempt
})
LOG.error(_LE("MAC generation error after %s attempts"), max_retries)
raise ext_dvr.MacAddressGenerationFailure(host=host)
def _create_dvr_mac_address(self, context, host):
"""Create DVR mac address for a given host."""
base_mac = cfg.CONF.dvr_base_mac.split(':')
try:
return self._create_dvr_mac_address_retry(context, host, base_mac)
except db_exc.DBDuplicateEntry:
LOG.error(_LE("MAC generation error after %s attempts"),
db_api.MAX_RETRIES)
raise ext_dvr.MacAddressGenerationFailure(host=host)
