new network module: edgeswitch_vlan (#48041)

* initial commit

* better commands generation

lib/ansible/module_utils/network/edgeswitch/edgeswitch_interface.py

@@ -0,0 +1,91 @@
+# This code is part of Ansible, but is an independent component.
+# This particular file snippet, and this file snippet only, is BSD licensed.
+# Modules you write using this snippet, which is embedded dynamically by Ansible
+# still belong to the author of the module, and may assign their own license
+# to the complete work.
+#
+# (c) 2018 Red Hat Inc.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright notice,
+#      this list of conditions and the following disclaimer in the documentation
+#      and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+import re
+
+
+class InterfaceConfiguration:
+    def __init__(self):
+        self.commands = []
+        self.merged = False
+
+    def has_same_commands(self, interface):
+        len1 = len(self.commands)
+        len2 = len(interface.commands)
+        return len1 == len2 and len1 == len(frozenset(self.commands).intersection(interface.commands))
+
+
+def merge_interfaces(interfaces):
+    """ to reduce commands generated by an edgeswitch module
+        we take interfaces one by one and we try to merge them with neighbors if everyone has same commands to run
+    """
+    merged = {}
+
+    for i, interface in interfaces.items():
+        if interface.merged:
+            continue
+        interface.merged = True
+
+        match = re.match(r'(\d+)\/(\d+)', i)
+        group = int(match.group(1))
+        start = int(match.group(2))
+        end = start
+
+        while True:
+            try:
+                start = start - 1
+                key = '{0}/{1}'.format(group, start)
+                neighbor = interfaces[key]
+                if not neighbor.merged and interface.has_same_commands(neighbor):
+                    neighbor.merged = True
+                else:
+                    break
+            except KeyError:
+                break
+        start = start + 1
+
+        while True:
+            try:
+                end = end + 1
+                key = '{0}/{1}'.format(group, end)
+                neighbor = interfaces[key]
+                if not neighbor.merged and interface.has_same_commands(neighbor):
+                    neighbor.merged = True
+                else:
+                    break
+            except KeyError:
+                break
+        end = end - 1
+
+        if end == start:
+            key = '{0}/{1}'.format(group, start)
+        else:
+            key = '{0}/{1}-{2}/{3}'.format(group, start, group, end)
+
+        merged[key] = interface
+    return merged