Add network definition file

src/network.py

@@ -0,0 +1,64 @@
+""" Network objects """
+
+import settings
+import util
+from xml_template import XMLTemplate
+
+import uuid
+import libvirt
+
+
+class Network(util.NumberedClass):
+    class AlreadyExists(Exception):
+        def __str__(self):
+            return "This network is already instanciated"
+
+    class TooMany(Exception):
+        def __init__(self, count):
+            self.count = count
+
+        def __str__(self):
+            return (
+                "Limit number reached. The current instance #{} does not fit in IPv4"
+            ).format(self.count)
+
+    def __init__(self, conn, name=None):
+        super().__init__()
+
+        if self.id > 250:
+            raise self.TooMany(self.id)
+
+        if not name:
+            name = str(self.id)
+
+        self.conn = conn
+        self.uuid = uuid.uuid4()
+        self.name = settings.PREFIX + "_" + name
+        self.bridge_id = settings.NETWORK_ID * 0xFF + self.id
+        self.bridge_mac = util.MACAddress(self.id, None)
+        self.ipv4 = util.Addrv4(self.id, None)
+        self.ipv6 = util.Addrv6(self.id, None)
+        self.lxc_network = None
+
+        try:
+            if self.conn.networkLookupByName(self.name):
+                raise self.AlreadyExists()
+        except libvirt.libvirtError:
+            pass
+
+    def create(self):
+        if self.lxc_network:
+            raise self.AlreadyExists()
+
+        xml = XMLTemplate("templates/network.xml").inst(
+            name=self.name,
+            uuid=self.uuid,
+            bridge_id=self.bridge_id,
+            mac=self.bridge_mac,
+            addrv4=self.ipv4,
+            netmaskv4=self.ipv4.netmask,
+            addrv6=self.ipv6,
+            prefixv6=self.ipv6.prefix,
+        )
+
+        self.lxc_network = self.conn.networkCreateXML(xml)

src/templates/network.xml

@@ -0,0 +1,11 @@
+<network>
+  <name>{name}</name>
+  <uuid>{uuid}</uuid>
+  <bridge name='virbr{bridge_id}' stp='on' delay='0'/>
+  <mac address='{mac}'/>
+  <domain name='{name}'/>
+  <ip address='{addrv4}' netmask='{netmaskv4}'>
+  </ip>
+  <ip family='ipv6' address='{addrv6}' prefix='{prefixv6}'>
+  </ip>
+</network>