Support for ELAN, ETREE, and VNoD Global Service

Change-Id: Iea1ee5b5b9224404a16bc9b88bc082719f75d10f
diff --git a/xos/synchronizer/invokers/vnodglobalserviceinvoker.py b/xos/synchronizer/invokers/vnodglobalserviceinvoker.py
new file mode 100644
index 0000000..a313171
--- /dev/null
+++ b/xos/synchronizer/invokers/vnodglobalserviceinvoker.py
@@ -0,0 +1,50 @@
+import json
+from synchronizers.metronetwork.invokers.invoker import Invoker
+from services.metronetwork.models import ServiceSpoke
+from services.metronetwork.models import BandwidthProfile
+from services.metronetwork.models import NetworkEdgeToEdgePointConnection
+
+class VnodGlobalServiceInvoker(Invoker):
+
+    def __init__(self, **args):
+        pass
+
+    # Method for handline pre save semantics
+    #      content here would be model specific but could include handling Many-to-Many relationship
+    #      creation - which must occur post save
+    #
+    # obj     - Whatever obj was just saved
+    # returns - None - this is a pure invoke() call, return type is None
+    #
+    def presave(self, obj):
+
+        if hasattr(obj, 'bwpname'):
+            bwprofile = BandwidthProfile.objects.get(name=obj.bwpname)
+            obj.bandwidthProfile = bwprofile
+
+        if hasattr(obj, 'pointtopointsid'):
+            connection = NetworkEdgeToEdgePointConnection.objects.get(sid=obj.pointtopointsid)
+            obj.metronetworkpointtopoint = connection
+
+    # Method for handline post save semantics
+    #      content here would be model specific but could include handling Many-to-Many relationship
+    #      creation - which must occur post save
+    #
+    # obj     - Whatever obj was just saved
+    # returns - N/A - this is a pure invoke() call
+    #
+    def postsave(self, obj):
+        #
+        # Ok - we need to handle the multipoint many-to-many relationships in here
+        #
+        # By design convnetion we will look for them in the 'backend_register' object field
+        # this is a json field that is general purpose - we will expect to find a JSON array
+        # called 'eps' that just containts a reference to a bunch of NetworkEdgePorts
+        #
+        if hasattr(obj, 'spokes_createbuffer'):
+            scratchpad = json.loads(obj.spokes_createbuffer)
+            spokes = scratchpad['spokes']
+
+            for spokeid in spokes:
+                spoke = ServiceSpoke.objects.get(name=spokeid)
+                obj.spokes.add(spoke)