1 files changed, 40 insertions, 0 deletions
diff --git a/vswitches/utils.py b/vswitches/utils.py
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+++ b/vswitches/utils.py
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+# Copyright 2015 Intel Corporation.
+#
+# 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.
+
+"""Utility functions for working with vSwitches and flows
+"""
+
+import copy
+
+def add_ports_to_flow(flow, in_port, out_port):
+    """Creates a new flow based on the given flow and adds in port and out port
+    to it.
+
+    The flow dictionary structure is described in IVswitch
+
+    :param flow: Description of the flow as a dictionary
+    :param in_port: OpenFlow number of the ingress port for the rule
+    :param out_port: OpenFlow number of the eggress port for the rule
+
+    :returns: A new dictionary describing a flow combining the parameters
+    """
+    new_flow = copy.deepcopy(flow)
+    new_flow['in_port'] = in_port
+
+    if 'actions' in new_flow:
+        new_flow['actions'].append('output:' + str(out_port))
+    else:
+        new_flow['actions'] = ['output:' + str(out_port)]
+
+    return new_flow