def _fetch_external_net_id(self, force=False):
"""Find UUID of single external network for this agent."""
if self.conf.gateway_external_network_id:
return self.conf.gateway_external_network_id
# L3 agent doesn't use external_network_bridge to handle external
# networks, so bridge_mappings with provider networks will be used
# and the L3 agent is able to handle any external networks.
if not self.conf.external_network_bridge:
return
if not force and self.target_ex_net_id:
return self.target_ex_net_id
try:
self.target_ex_net_id = self.plugin_rpc.get_external_network_id(
self.context)
return self.target_ex_net_id
except rpc_common.RemoteError as e:
with excutils.save_and_reraise_exception() as ctx:
if e.exc_type == 'TooManyExternalNetworks':
ctx.reraise = False
msg = _(
"The 'gateway_external_network_id' option must be "
"configured for this agent as Crd has more than "
"one external network.")
raise Exception(msg)
def get_bridge_name_for_port_name(self, port_name):
try:
return self.run_vsctl(['port-to-br', port_name], check_error=True)
except RuntimeError as e:
with excutils.save_and_reraise_exception() as ctxt:
if 'Exit code: 1\n' in str(e):
ctxt.reraise = False
def get_bridges(root_helper):
args = ["ovs-vsctl", "--timeout=%d" % cfg.CONF.ovs_vsctl_timeout,
"list-br"]
try:
return utils.execute(args, root_helper=root_helper).strip().split("\n")
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.exception(_("Unable to retrieve bridges. Exception: %s"), e)
def __call__(self, target, creds):
if self.target_field not in target:
# policy needs a plugin check
# target field is in the form resource:field
# however if they're not separated by a colon, use an underscore
# as a separator for backward compatibility
def do_split(separator):
parent_res, parent_field = self.target_field.split(
separator, 1)
return parent_res, parent_field
for separator in (':', '_'):
try:
parent_res, parent_field = do_split(separator)
break
except ValueError:
LOG.debug(_("Unable to find ':' as separator in %s."),
self.target_field)
else:
# If we are here split failed with both separators
err_reason = (_("Unable to find resource name in %s") %
self.target_field)
LOG.exception(err_reason)
raise exceptions.PolicyCheckError(
policy="%s:%s" % (self.kind, self.match),
reason=err_reason)
parent_foreign_key = attributes.RESOURCE_FOREIGN_KEYS.get(
"%ss" % parent_res, None)
if not parent_foreign_key:
err_reason = (_("Unable to verify match:%(match)s as the "
"parent resource: %(res)s was not found") %
{'match': self.match, 'res': parent_res})
LOG.exception(err_reason)
raise exceptions.PolicyCheckError(
policy="%s:%s" % (self.kind, self.match),
reason=err_reason)
# NOTE(salv-orlando): This check currently assumes the parent
# resource is handled by the core plugin. It might be worth
# having a way to map resources to plugins so to make this
# check more general
f = getattr(manager.CrdManager.get_instance().plugin,
'get_%s' % parent_res)
# f *must* exist, if not found it is better to let crd
# explode. Check will be performed with admin context
context = importutils.import_module('crdservice.context')
try:
data = f(context.get_admin_context(),
target[parent_foreign_key],
fields=[parent_field])
target[self.target_field] = data[parent_field]
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_('Policy check error while calling %s!'), f)
match = self.match % target
if self.kind in creds:
return match == unicode(creds[self.kind])
return False
def bridge_exists(self, bridge_name):
try:
self.run_vsctl(['br-exists', bridge_name], check_error=True)
except RuntimeError as e:
with excutils.save_and_reraise_exception() as ctxt:
if 'Exit code: 2\n' in str(e):
ctxt.reraise = False
return False
return True
def get_xapi_iface_id(self, xs_vif_uuid):
args = ["xe", "vif-param-get", "param-name=other-config",
"param-key=nicira-iface-id", "uuid=%s" % xs_vif_uuid]
try:
return utils.execute(args, root_helper=self.root_helper).strip()
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(_("Unable to execute %(cmd)s. "
"Exception: %(exception)s"),
{'cmd': args, 'exception': e})
def run_vsctl(self, args, check_error=False):
full_args = ["ovs-vsctl", "--timeout=%d" % self.vsctl_timeout] + args
try:
return utils.execute(full_args, root_helper=self.root_helper)
except Exception as e:
with excutils.save_and_reraise_exception() as ctxt:
LOG.error(_("Unable to execute %(cmd)s. "
"Exception: %(exception)s"),
{'cmd': full_args, 'exception': e})
if not check_error:
ctxt.reraise = False
def find_child_pids(pid):
"""Retrieve a list of the pids of child processes of the given pid."""
try:
raw_pids = execute(['ps', '--ppid', pid, '-o', 'pid='])
except RuntimeError as e:
# Unexpected errors are the responsibility of the caller
with excutils.save_and_reraise_exception() as ctxt:
# Exception has already been logged by execute
no_children_found = 'Exit code: 1' in str(e)
if no_children_found:
ctxt.reraise = False
return []
return [x.strip() for x in raw_pids.split('\n') if x.strip()]
def __init__(self, conf):
self.conf = conf
dirname = os.path.dirname(cfg.CONF.metadata_proxy_socket)
if os.path.isdir(dirname):
try:
os.unlink(cfg.CONF.metadata_proxy_socket)
except OSError:
with excutils.save_and_reraise_exception() as ctxt:
if not os.path.exists(cfg.CONF.metadata_proxy_socket):
ctxt.reraise = False
else:
os.makedirs(dirname, 0o755)
self._init_state_reporting()
def _get_resource(self, context, model, id):
try:
r = self._get_by_id(context, model, id)
except exc.NoResultFound:
with excutils.save_and_reraise_exception(reraise=False) as ctx:
if issubclass(model, Vip):
raise loadbalancer.VipNotFound(vip_id=id)
elif issubclass(model, Pool):
raise loadbalancer.PoolNotFound(pool_id=id)
elif issubclass(model, Member):
raise loadbalancer.MemberNotFound(member_id=id)
elif issubclass(model, HealthMonitor):
raise loadbalancer.HealthMonitorNotFound(monitor_id=id)
ctx.reraise = True
return r
def _delete_db_pool(self, context, id):
# proxy the call until plugin inherits from DBPlugin
# rely on uuid uniqueness:
try:
with context.session.begin(subtransactions=True):
self.service_type_manager.del_resource_associations(
context, [id])
super(LoadBalancerPlugin, self).delete_pool(context, id)
except Exception:
# that should not happen
# if it's still a case - something goes wrong
# log the error and mark the pool as ERROR
LOG.error(_('Failed to delete pool %s, putting it in ERROR state'),
id)
with excutils.save_and_reraise_exception():
self.update_status(context, ldb.Pool,
id, constants.ERROR)
def load_drivers(service_type, plugin):
"""Loads drivers for specific service.
Passes plugin instance to driver's constructor
"""
service_type_manager = sdb.ServiceTypeManager.get_instance()
providers = (service_type_manager.
get_service_providers(
None,
filters={'service_type': [service_type]})
)
if not providers:
msg = (_("No providers specified for '%s' service, exiting") %
service_type)
LOG.error(msg)
raise SystemExit(msg)
drivers = {}
for provider in providers:
try:
drivers[provider['name']] = importutils.import_object(
provider['driver'], plugin
# provider['driver']
)
LOG.debug(_("Loaded '%(provider)s' provider for service "
"%(service_type)s"),
{'provider': provider['driver'],
'service_type': service_type})
except ImportError:
with excutils.save_and_reraise_exception():
LOG.exception(_("Error loading provider '%(provider)s' for "
"service %(service_type)s"),
{'provider': provider['driver'],
'service_type': service_type})
default_provider = None
try:
provider = service_type_manager.get_default_service_provider(
None, service_type)
default_provider = provider['name']
except pconf.DefaultServiceProviderNotFound:
LOG.info(_("Default provider is not specified for service type %s"),
service_type)
return drivers, default_provider
def __iter__(self):
"""Return a result until we get a 'None' response from consumer"""
if self._done:
raise StopIteration
while True:
try:
self._iterator.next()
except Exception:
with excutils.save_and_reraise_exception():
self.done()
if self._got_ending:
self.done()
raise StopIteration
result = self._result
if isinstance(result, Exception):
self.done()
raise result
yield result
def __iter__(self):
"""Return a result until we get a reply with an 'ending" flag"""
if self._done:
raise StopIteration
while True:
try:
data = self._dataqueue.get(timeout=self._timeout)
result = self._process_data(data)
except queue.Empty:
LOG.exception(_('Timed out waiting for RPC response.'))
self.done()
raise rpc_common.Timeout()
except Exception:
with excutils.save_and_reraise_exception():
self.done()
if self._got_ending:
self.done()
raise StopIteration
if isinstance(result, Exception):
self.done()
raise result
yield result
def create_or_update_agent(self, context, agent):
"""Create or update agent according to report."""
try:
return self._create_or_update_agent(context, agent)
except db_exc.DBDuplicateEntry as e:
with excutils.save_and_reraise_exception() as ctxt:
if e.columns == ["agent_type", "host"]:
# It might happen that two or more concurrent transactions
# are trying to insert new rows having the same value of
# (agent_type, host) pair at the same time (if there has
# been no such entry in the table and multiple agent status
# updates are being processed at the moment). In this case
# having a unique constraint on (agent_type, host) columns
# guarantees that only one transaction will succeed and
# insert a new agent entry, others will fail and be rolled
# back. That means we must retry them one more time: no
# INSERTs will be issued, because
# _get_agent_by_type_and_host() will return the existing
# agent entry, which will be updated multiple times
ctxt.reraise = False
return self._create_or_update_agent(context, agent)
