1 files changed, 107 insertions, 0 deletions
diff --git a/resources/libraries/python/Tap.py b/resources/libraries/python/Tap.py
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+++ b/resources/libraries/python/Tap.py
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+# Copyright (c) 2016 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.
+
+"""Tap utilities library."""
+
+from resources.libraries.python.VatExecutor import VatTerminal
+from resources.libraries.python.InterfaceUtil import InterfaceUtil
+
+
+class Tap(object):
+    """Tap utilities."""
+
+    @staticmethod
+    def add_tap_interface(node, tap_name, mac=None):
+        """Add tap interface with name and optionally with MAC.
+
+        :param node: Node to add tap on.
+        :param tap_name: Tap interface name for linux tap.
+        :param mac: Optional MAC address for VPP tap.
+        :type node: dict
+        :type tap_name: str
+        :type mac: str
+        :return: Returns a interface index.
+        :rtype: int
+        """
+        command = 'connect'
+        if mac is not None:
+            args = 'tapname {} mac {}'.format(tap_name, mac)
+        else:
+            args = 'tapname {}'.format(tap_name)
+        with VatTerminal(node) as vat:
+            resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
+                                                           tap_command=command,
+                                                           tap_arguments=args)
+        return resp[0]['sw_if_index']
+
+    @staticmethod
+    def modify_tap_interface(node, if_index, tap_name, mac=None):
+        """Modify tap interface like linux interface name or VPP MAC.
+
+        :param node: Node to modify tap on.
+        :param if_index: Index of tap interface to be modified.
+        :param tap_name: Tap interface name for linux tap.
+        :param mac: Optional MAC address for VPP tap.
+        :type node: dict
+        :type if_index: int
+        :type tap_name: str
+        :type mac: str
+        :return: Returns a interface index.
+        :rtype: int
+        """
+        command = 'modify'
+        if mac is not None:
+            args = 'sw_if_index {} tapname {} mac {}'.format(
+                if_index, tap_name, mac)
+        else:
+            args = 'sw_if_index {} tapname {}'.format(if_index, tap_name)
+        with VatTerminal(node) as vat:
+            resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
+                                                           tap_command=command,
+                                                           tap_arguments=args)
+        return resp[0]['sw_if_index']
+
+    @staticmethod
+    def delete_tap_interface(node, if_index):
+        """Delete tap interface.
+
+        :param node: Node to delete tap on.
+        :param if_index: Index of tap interface to be deleted.
+        :type node: dict
+        :type if_index: int
+        :raises RuntimeError: Deletion was not successful.
+        """
+        command = 'delete'
+        args = 'sw_if_index {}'.format(if_index)
+        with VatTerminal(node) as vat:
+            resp = vat.vat_terminal_exec_cmd_from_template('tap.vat',
+                                                           tap_command=command,
+                                                           tap_arguments=args)
+            if int(resp[0]['retval']) != 0:
+                raise RuntimeError(
+                    'Could not remove tap interface: {}'.format(resp))
+
+    @staticmethod
+    def check_tap_present(node, tap_name):
+        """Check whether specific tap interface exists.
+
+        :param node: Node to check tap on.
+        :param tap_name: Tap interface name for linux tap.
+        :type node: dict
+        :type tap_name: str
+        :raises RuntimeError: Specified interface was not found.
+        """
+        tap_if = InterfaceUtil.tap_dump(node, tap_name)
+        if len(tap_if) == 0:
+            raise RuntimeError(
+                'Tap interface :{} does not exist'.format(tap_name))