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# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Linux limit library."""
from resources.libraries.python.ssh import exec_cmd_no_error
__all__ = ["LimitUtil"]
class LimitUtil(object):
"""Class contains methods for getting or setting process resource limits."""
@staticmethod
def get_pid_limit(node, pid):
"""Get process resource limits.
:param node: Node in the topology.
:param pid: Process ID.
:type node: dict
:type pid: int
"""
command = 'prlimit --noheadings --pid={pid}'.format(pid=pid)
message = 'Node {host} failed to run: {command}'.\
format(host=node['host'], command=command)
exec_cmd_no_error(node, command, sudo=True, message=message)
@staticmethod
def set_pid_limit(node, pid, resource, limit):
"""Set process resource limits.
:param node: Node in the topology.
:param pid: Process ID.
:param resource: Resource to set limits.
:param limit: Limit value.
:type node: dict
:type pid: int
:type resource: str
:type limit: str
"""
command = 'prlimit --{resource}={limit} --pid={pid}'.format(
resource=resource, limit=limit, pid=pid)
message = 'Node {host} failed to run: {command}'.\
format(host=node['host'], command=command)
exec_cmd_no_error(node, command, sudo=True, message=message)
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