CSIT-845 Capture VPP core-dump from vpp crash on DUTs

[csit.git] / resources / libraries / python / LimitUtil.py

diff --git a/resources/libraries/python/LimitUtil.py b/resources/libraries/python/LimitUtil.py
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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)
+