Initial commit for basic ENI Debian/Ubuntu network config

This uses /etc/network/interfaces single file format.
Includes basic tests

1 files changed, 132 insertions, 0 deletions

diff --git a/os_net_config/impl_eni.py b/os_net_config/impl_eni.py
new file mode 100644
index 0000000..79671d0
--- /dev/null
+++ b/os_net_config/impl_eni.py
@@ -0,0 +1,132 @@
+
+# -*- coding: utf-8 -*-
+
+# 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 netaddr
+import os_net_config
+from os_net_config import utils
+
+from os_net_config.openstack.common import processutils
+
+
+# TODO(?): should move to interfaces.d
+def _network_config_path():
+    return "/etc/network/interfaces"
+
+
+class ENINetConfig(os_net_config.NetConfig):
+    """Ubuntu/Debian implementation for network config
+
+       Configure iface/bridge/routes using debian/ubuntu
+       /etc/network/interfaces format.
+    """
+
+    def __init__(self):
+        self.interfaces = {}
+        self.routes = {}
+        self.bridges = {}
+
+    def _addCommon(self, interface):
+
+        def _static_addresses(_v4, _v6):
+            addr = _v4 + _v6
+            address_data = ""
+            if addr:
+                address_data += "address %s\n" % addr[0].ip
+                address_data += "netmask %s\n" % addr[0].netmask
+            return address_data
+
+        _v6 = interface.v6_addresses()
+        _v4 = interface.v4_addresses()
+        _iface = "iface %s " % interface.name
+        if _v6:
+            _iface += "inet6 "
+        else:
+            _iface += "inet "
+        if interface.use_dhcp:
+            _iface += "dhcp\n"
+        elif interface.addresses:
+            _iface += "static\n"
+        else:
+            _iface += "manual\n"
+        data = ""
+        if interface.type == 'ovs_bridge':
+            data += "allow-ovs %s\n" % interface.name
+            data += _iface
+            data += _static_addresses(_v4, _v6)
+            data += "ovs_type OVSBridge\n"
+            if interface.members:
+                data += "ovs_ports"
+                for i in interface.members:
+                    data += " %s" % i.name
+                data += "\n"
+        elif interface.type == 'ovs_port':
+            data += "allow-%s %s\n" % (interface.bridge_name, interface.name)
+            data += _iface
+            data += _static_addresses(_v4, _v6)
+            data += "ovs_bridge %s\n" % interface.bridge_name
+            data += "ovs_type OVSPort\n"
+        else:
+            data += "auto %s\n" % interface.name
+            data += _iface
+            data += _static_addresses(_v4, _v6)
+        return data
+
+    def addInterface(self, interface):
+        data = self._addCommon(interface)
+
+        self.interfaces[interface.name] = data
+        if interface.routes:
+            self._addRoutes(interface.name, interface.routes)
+
+    def addBridge(self, bridge):
+        data = self._addCommon(bridge)
+
+        self.bridges[bridge.name] = data
+        if bridge.routes:
+            self._addRoutes(bridge.name, bridge.routes)
+        if bridge.routes:
+            self._addRoutes(bridge.name, bridge.routes)
+
+    def _addRoutes(self, interface_name, routes=[]):
+        data = ""
+        for route in routes:
+            rt = netaddr.IPNetwork(route.ip_netmask)
+            data += "up route add -net %s netmask %s gw %s\n" % (
+                    str(rt.ip), str(rt.netmask), route.next_hop)
+            data += "down route del -net %s netmask %s gw %s\n" % (
+                    str(rt.ip), str(rt.netmask), route.next_hop)
+        self.routes[interface_name] = data
+
+    def apply(self):
+        new_config = ""
+        for interface_name, iface_data in self.interfaces.iteritems():
+            route_data = self.routes.get(interface_name)
+            iface_data += (route_data or '')
+            new_config += iface_data
+
+        for bridge_name, bridge_data in self.bridges.iteritems():
+            route_data = self.routes.get(bridge_name)
+            bridge_data += (route_data or '')
+            new_config += bridge_data
+        if (utils.diff(_network_config_path(), new_config)):
+            for interface in self.interfaces.keys():
+                processutils.execute('/sbin/ifdown', interface,
+                                     check_exit_code=False)
+
+            for bridge in self.bridges.keys():
+                processutils.execute('/sbin/ifdown', bridge,
+                                     check_exit_code=False)
+
+            utils.write_config(_network_config_path(), new_config)