[Admin-Util]: Add support to list missing edges for NSXv plugin

This patch adds support to list missing-edges for NSXv plugin.
Missing edges are those edges which are present in the Neutron DB
but are not present on the NSX-v backend.

Usage:
nsxadmin -o list -r missing-edges
NSX Plugin in use: nsxv
==== [NSX] List Missing Edges ====
NSXv edges present in Neutron DB but not present on the NSXv backend

missing-edges
+----------+
| edge_id  |
+----------+
| edge-121 |
+----------+

DocImpact

Change-Id: I19d6356694012ef9d050b5b8a179a11e438b7b3f

vmware_nsx/shell/admin/plugins/common/constants.py

@@ -31,4 +31,5 @@ SPOOFGUARD_POLICY = 'spoofguard-policy'
 DHCP_BINDING = 'dhcp-binding'
 BACKUP_EDGES = 'backup-edges'
 ORPHANED_EDGES = 'orphaned-edges'
+MISSING_EDGES = 'missing-edges'
 NETWORKS = 'networks'

vmware_nsx/shell/admin/plugins/nsxv/resources/edges.py

@@ -118,6 +118,39 @@ def nsx_delete_orphaned_edges(resource, event, trigger, **kwargs):
         pprint.pformat(get_orphaned_edges()))
 
 
+def get_missing_edges():
+    nsxv_edge_ids = set()
+    for edge in get_nsxv_edges():
+        nsxv_edge_ids.add(edge.get('id'))
+
+    neutron_edge_bindings = set()
+    for binding in get_router_edge_bindings():
+        neutron_edge_bindings.add(binding.edge_id)
+
+    return neutron_edge_bindings - nsxv_edge_ids
+
+
+@admin_utils.output_header
+def nsx_list_missing_edges(resource, event, trigger, **kwargs):
+    """List missing Edges on NSXv.
+
+    Missing edges are NSXv edges that have a binding in Neutron DB
+    but are currently missing from the NSXv backend.
+    """
+    LOG.info(_LI("NSXv edges present in Neutron DB but not present "
+                 "on the NSXv backend\n"))
+    missing_edges = get_missing_edges()
+    if not missing_edges:
+        LOG.info(_LI("\nNo edges are missing."
+                     "\nNeutron DB and NSXv backend are in sync\n"))
+    else:
+        LOG.info(constants.MISSING_EDGES)
+        data = [('edge_id',)]
+        for edge in missing_edges:
+            data.append((edge,))
+        LOG.info(formatters.tabulate_results(data))
+
+
 def change_edge_ha(properties):
     ha = bool(properties.get('highavailability').lower() == "true")
     request = {
@@ -179,6 +212,9 @@ registry.subscribe(nsx_list_orphaned_edges,
 registry.subscribe(nsx_delete_orphaned_edges,
                    constants.ORPHANED_EDGES,
                    shell.Operations.CLEAN.value)
+registry.subscribe(nsx_list_missing_edges,
+                   constants.MISSING_EDGES,
+                   shell.Operations.LIST.value)
 registry.subscribe(nsx_update_edge,
                    constants.EDGES,
                    shell.Operations.NSX_UPDATE.value)

vmware_nsx/shell/nsxadmin.py

@@ -92,6 +92,8 @@ nsxv_resources = {
     constants.ORPHANED_EDGES: Resource(constants.ORPHANED_EDGES,
                                        [Operations.LIST.value,
                                         Operations.CLEAN.value]),
+    constants.MISSING_EDGES: Resource(constants.MISSING_EDGES,
+                                      [Operations.LIST.value]),
     constants.SPOOFGUARD_POLICY: Resource(constants.SPOOFGUARD_POLICY,
                                           [Operations.LIST.value,
                                            Operations.CLEAN.value]),