migrate code over from xos repo

Change-Id: I764ac3196babdb1ce78dded2b2d8d6ad6e965ca6
diff --git a/xos/synchronizer/model_policies/model_policy_Slice.py b/xos/synchronizer/model_policies/model_policy_Slice.py
new file mode 100644
index 0000000..088d583
--- /dev/null
+++ b/xos/synchronizer/model_policies/model_policy_Slice.py
@@ -0,0 +1,102 @@
+from xos.config import Config
+
+def handle_delete(slice):
+    from core.models import Controller, ControllerSlice, SiteDeployment, Network, NetworkSlice,NetworkTemplate, Slice
+    from collections import defaultdict
+
+    public_nets = []
+    private_net = None
+    networks = Network.objects.filter(owner=slice)
+
+    for n in networks:
+        n.delete()	
+    
+    # Note that sliceprivileges and slicecontrollers are autodeleted, through the dependency graph
+
+def handle(slice):
+    from core.models import Controller, ControllerSlice, SiteDeployment, Network, NetworkSlice,NetworkTemplate, Slice
+    from collections import defaultdict
+
+    # only create nat_net if not using VTN
+    support_nat_net = not getattr(Config(), "networking_use_vtn", False)
+
+    print "MODEL POLICY: slice", slice
+
+    # slice = Slice.get(slice_id)
+
+    controller_slices = ControllerSlice.objects.filter(slice=slice)
+    existing_controllers = [cs.controller for cs in controller_slices] 
+        
+    print "MODEL POLICY: slice existing_controllers=", existing_controllers
+
+    all_controllers = Controller.objects.all()
+    for controller in all_controllers:
+        if controller not in existing_controllers:
+            print "MODEL POLICY: slice adding controller", controller
+            sd = ControllerSlice(slice=slice, controller=controller)
+            sd.save()
+
+    if slice.network in ["host", "bridged"]:
+        # Host and Bridged docker containers need no networks and they will
+        # only get in the way.
+        print "MODEL POLICY: Skipping network creation"
+    elif slice.network in ["noauto"]:
+        # do nothing
+        pass
+    else:
+        # make sure slice has at least 1 public and 1 private networkd
+        public_nets = []
+        private_nets = []
+        networks = Network.objects.filter(owner=slice)
+        for network in networks:
+            if not network.autoconnect:
+                continue
+            if network.template.name == 'Public dedicated IPv4':
+                public_nets.append(network)
+            elif network.template.name == 'Public shared IPv4':
+                public_nets.append(network)
+            elif network.template.name == 'Private':
+                private_nets.append(network)
+        if support_nat_net and (not public_nets):
+            # ensure there is at least one public network, and default it to dedicated
+            nat_net = Network(
+                    name = slice.name+'-nat',
+                        template = NetworkTemplate.objects.get(name='Public shared IPv4'),
+                    owner = slice
+                    )
+            if slice.exposed_ports:
+                nat_net.ports = slice.exposed_ports
+            nat_net.save()
+            public_nets.append(nat_net)
+            print "MODEL POLICY: slice", slice, "made nat-net"
+
+        if not private_nets:
+            private_net = Network(
+                name = slice.name+'-private',
+                template = NetworkTemplate.objects.get(name='Private'),
+                owner = slice
+            )
+            private_net.save()
+            print "MODEL POLICY: slice", slice, "made private net"
+            private_nets = [private_net]
+        # create slice networks
+        public_net_slice = None
+        private_net_slice = None
+        net_slices = NetworkSlice.objects.filter(slice=slice, network__in=private_nets+public_nets)
+        for net_slice in net_slices:
+            if net_slice.network in public_nets:
+                public_net_slice = net_slice
+            elif net_slice.network in private_nets:
+                private_net_slice = net_slice
+        if support_nat_net and (not public_net_slice):
+            public_net_slice = NetworkSlice(slice=slice, network=public_nets[0])
+            public_net_slice.save()
+            print "MODEL POLICY: slice", slice, "made public_net_slice"
+        if not private_net_slice:
+            private_net_slice = NetworkSlice(slice=slice, network=private_nets[0])
+            private_net_slice.save()
+            print "MODEL POLICY: slice", slice, "made private_net_slice"
+
+    print "MODEL POLICY: slice", slice, "DONE"
+
+