1 files changed, 181 insertions, 0 deletions
diff --git a/vicn/core/address_mgr.py b/vicn/core/address_mgr.py
new file mode 100644
index 00000000..7df5e4ac
--- /dev/null
+++ b/vicn/core/address_mgr.py
@@ -0,0 +1,181 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2017 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.
+#
+
+import ipaddress
+import logging
+import random
+import struct
+import socket
+
+from netmodel.util.deprecated   import deprecated
+from netmodel.util.singleton    import Singleton
+from netmodel.util.toposort     import toposort, toposort_flatten
+
+log = logging.getLogger(__name__)
+
+#------------------------------------------------------------------------------
+# SharedResource
+#------------------------------------------------------------------------------
+
+class SharedResource:
+    """
+    Base class for allocating shared resource
+    """
+    def __init__(self):
+        self._counter = 0
+        self._values = dict()
+
+    def __next__(self):
+        ret = self._counter
+        self._counter += 1
+        return ret
+
+    def get(self, requestor, tag = None):
+        if requestor not in self._values:
+            self._values[requestor] = dict()
+        if tag not in self._values[requestor]:
+            self._values[requestor][tag] = next(self)
+        return self._values[requestor][tag]
+
+#------------------------------------------------------------------------------
+
+class Vlan(SharedResource):
+    """
+    SharedResource: Vlan
+
+    Manages VLAN allocation
+    """
+    
+    def get(self, requestor, tag = None):
+        if requestor not in self._values:
+            self._values[requestor] = dict()
+        if tag not in self._values[requestor]:
+            self._values[requestor][tag] = (next(self)+1)
+        return self._values[requestor][tag]
+
+#------------------------------------------------------------------------------
+    
+MAX_DEVICE_NAME_SIZE = 15
+
+class DeviceName(SharedResource):
+
+    def get(self, *args, prefix = None, **kwargs):
+        count = super().get(*args, **kwargs)
+        device_name = '{}{}'.format(prefix, count)
+        if len(device_name) > MAX_DEVICE_NAME_SIZE:
+            overflow = len(device_name) - MAX_DEVICE_NAME_SIZE
+            max_prefix_len = len(prefix) - overflow
+            device_name = '{}{}'.format(prefix[:max_prefix_len], count)
+        return device_name
+
+#------------------------------------------------------------------------------
+
+class IpAddress(SharedResource):
+    pass
+
+class Ipv4Address(IpAddress):
+    pass
+
+class Ipv6Address(IpAddress):
+    pass
+
+#------------------------------------------------------------------------------
+# AddressManager
+#------------------------------------------------------------------------------
+
+class AddressManager(metaclass = Singleton):
+    """
+    The purpose of this class is to generate sequential deterministic MAC/IP
+    addresses in order to assign them to the node in the network.
+    """
+
+    MAP_TYPE = {
+        'vlan': Vlan,
+        'device_name': DeviceName,
+    }
+
+    def __init__(self):
+        self._ips = dict()
+        self._macs = dict()
+
+        self._pools = dict()
+
+        from vicn.core.resource_mgr import ResourceManager
+
+        network = ResourceManager().get('network')
+        network = ipaddress.ip_network(network, strict=False)
+        self._next_ip = network[1]
+
+        mac_address_base = ResourceManager().get('mac_address_base')
+        self._next_mac = int(mac_address_base, 0) + 1
+
+    def get(self, resource_type, requestor, *args, tag=None, scope=None,
+            **kwargs):
+        """
+        Params:
+          type : the type of shared resource to be requested
+          requestor: name of the resource that requests the shared resource, in
+            order to reattribute the same if requested multiple times.
+          tag: use when a single resource request multiple times the same
+            resource.
+          scope: None = global scope by default. Ensure uniqueness of resource
+            at global scope
+        """
+        if not scope in self._pools:
+            self._pools[scope] = dict()
+        if not resource_type in self._pools[scope]:
+            self._pools[scope][resource_type] = self.MAP_TYPE[resource_type]() 
+        return self._pools[scope][resource_type].get(requestor, tag, 
+                *args, **kwargs)
+
+    #--------------------------------------------------------------------------
+    # Attributes
+    #--------------------------------------------------------------------------
+
+    def get_mac(self, resource_name):
+        """
+        Generate a new mac address to assign to the containers created.
+
+        :return: The MAC address
+        """
+
+        if resource_name in self._macs:
+            return self._macs[resource_name]
+
+        mac = ':'.join(map(''.join, 
+                    zip(*[iter(hex(self._next_mac)[2:].zfill(12))]*2)))
+        self._next_mac += 1
+
+        self._macs[resource_name] = mac
+        return mac
+
+    def get_ip(self, resource):
+        """
+        Generate a new ip address to assign to the containers created.
+
+        :return: The IP address
+        """
+
+        if resource in self._ips:
+            return self._ips[resource]
+
+        ip = str(self._next_ip)
+        self._next_ip += 1
+
+        self._ips[resource] = ip
+        return ip