def get_project_limits(self, project_id, resource_names):
"""Get all the limits for given project a resource_name list
We will raise ClaimExceedsLimit if no limit is found to ensure that
all clients of this library react to this situation in the same way.
:param project_id:
:param resource_names: list of resource_name strings
:return: list of (resource_name,limit) pairs
:raises exception.ClaimExceedsLimit: if no limit is found
"""
# Using a list to preserver the resource_name order
project_limits = []
missing_limits = []
for resource_name in resource_names:
try:
limit = self._get_limit(project_id, resource_name)
project_limits.append((resource_name, limit))
except _LimitNotFound:
missing_limits.append(resource_name)
if len(missing_limits) > 0:
over_limit_list = [
exception.OverLimitInfo(name, 0, 0, 0)
for name in missing_limits
]
raise exception.ProjectOverLimit(project_id, over_limit_list)
return project_limits
def enforce_limits(project_id, limits, current_usage, deltas):
"""Check that proposed usage is not over given limits
:param project_id: project being checked
:param limits: list of (resource_name,limit) pairs
:param current_usage: dict of resource name and current usage
:param deltas: dict of resource name and proposed additional usage
:raises exception.ClaimExceedsLimit: raise if over limit
"""
over_limit_list = []
for resource_name, limit in limits:
if resource_name not in current_usage:
msg = "unable to get current usage for %s" % resource_name
raise ValueError(msg)
current = int(current_usage[resource_name])
delta = int(deltas[resource_name])
proposed_usage_total = current + delta
if proposed_usage_total > limit:
over_limit_list.append(
exception.OverLimitInfo(resource_name, limit, current,
delta))
if len(over_limit_list) > 0:
LOG.debug("hit limit for project: %s", over_limit_list)
raise exception.ProjectOverLimit(project_id, over_limit_list)
def test_enforce_num_instances_and_flavor_fails(self, mock_limit):
mock_enforcer = mock.MagicMock()
mock_limit.return_value = mock_enforcer
over_limit_info_list = [
limit_exceptions.OverLimitInfo("class:VCPU", 12, 0, 20),
limit_exceptions.OverLimitInfo("servers", 2, 1, 2)
]
expected = limit_exceptions.ProjectOverLimit(uuids.project_id,
over_limit_info_list)
mock_enforcer.enforce.side_effect = expected
# Verify that the oslo.limit ProjectOverLimit gets translated to a
# TooManyInstances that the API knows how to handle
e = self.assertRaises(
exception.TooManyInstances,
placement_limits.enforce_num_instances_and_flavor, self.context,
uuids.project_id, self.flavor, True, 2, 4)
self.assertEqual(str(expected), str(e))
self.assertEqual(3, mock_enforcer.enforce.call_count)
def test_enforce_raises_on_missing_limit(self, mock_get_limits):
mock_usage = mock.MagicMock()
project_id = uuid.uuid4().hex
deltas = {"a": 0, "b": 0}
mock_get_limits.side_effect = exception.ProjectOverLimit(
project_id, [exception.OverLimitInfo("a", 0, 0, 0)])
enforcer = limit._FlatEnforcer(mock_usage)
self.assertRaises(exception.ProjectOverLimit, enforcer.enforce,
project_id, deltas)
def test_enforce_num_instances_and_flavor_retry(self, mock_limit):
mock_enforcer = mock.MagicMock()
mock_limit.return_value = mock_enforcer
over_limit_info_list = [
limit_exceptions.OverLimitInfo("class:VCPU", 12, 0, 30)
]
mock_enforcer.enforce.side_effect = [
limit_exceptions.ProjectOverLimit(uuids.project_id,
over_limit_info_list), None
]
count = placement_limits.enforce_num_instances_and_flavor(
self.context, uuids.project_id, self.flavor, True, 0, 3)
self.assertEqual(2, count)
self.assertEqual(2, mock_enforcer.enforce.call_count)
mock_enforcer.enforce.assert_called_with(
uuids.project_id, {
'servers': 2,
'class:VCPU': 20,
'class:MEMORY_MB': 200,
'class:DISK_GB': 4
})