NSX|v: get internal net by az fix

getting the internal network per availability zone has a fallback to the
default az which should not always be used.
This patch creates a version of this db api without a fallback and uses
it when we shouldn't use the default az.

Change-Id: I2ec37e431fa08c80c19c32a50ed4e5a71222b0c2

vmware_nsx/db/nsxv_db.py

@@ -34,6 +34,7 @@ from vmware_nsx.db import db as nsx_db
 from vmware_nsx.db import nsxv_models
 from vmware_nsx.extensions import dhcp_mtu as ext_dhcp_mtu
 from vmware_nsx.extensions import dns_search_domain as ext_dns_search_domain
+from vmware_nsx.plugins.nsx_v import availability_zones as nsx_az
 from vmware_nsx.plugins.nsx_v.vshield.common import constants
 
 NsxvEdgeDhcpStaticBinding = nsxv_models.NsxvEdgeDhcpStaticBinding
@@ -379,7 +380,8 @@ def create_nsxv_internal_network(session, network_purpose,
                               'az': availability_zone})
 
 
-def get_nsxv_internal_network(session, network_purpose, availability_zone):
+def get_nsxv_internal_network(session, network_purpose, availability_zone,
+                              default_fallback=True):
     with session.begin(subtransactions=True):
         net_list = (session.query(nsxv_models.NsxvInternalNetworks).
                     filter_by(network_purpose=network_purpose,
@@ -387,16 +389,23 @@ def get_nsxv_internal_network(session, network_purpose, availability_zone):
         if net_list:
             # Should have only one results as purpose+az are the keys
             return net_list[0]
-        else:
+        elif default_fallback and availability_zone != nsx_az.DEFAULT_NAME:
             # try the default availability zone, since this zone does not
-            # have his own
+            # have his own internal edge
             net_list = (session.query(nsxv_models.NsxvInternalNetworks).
                         filter_by(network_purpose=network_purpose,
-                                  availability_zone='default').all())
+                                  availability_zone=nsx_az.DEFAULT_NAME).all())
             if net_list:
                 return net_list[0]
 
 
+def get_nsxv_internal_network_for_az(session, network_purpose,
+                                     availability_zone):
+    return get_nsxv_internal_network(session, network_purpose,
+                                     availability_zone,
+                                     default_fallback=False)
+
+
 def get_nsxv_internal_networks(session, network_purpose):
     with session.begin(subtransactions=True):
         return (session.query(nsxv_models.NsxvInternalNetworks).

vmware_nsx/plugins/nsx_v/md_proxy.py

@@ -156,7 +156,7 @@ class NsxVMetadataProxyHandler(object):
 
     def _get_internal_net_by_az(self, context):
         # Get the internal network for the current az
-        int_net = nsxv_db.get_nsxv_internal_network(
+        int_net = nsxv_db.get_nsxv_internal_network_for_az(
             context.session,
             vcns_const.InternalEdgePurposes.INTER_EDGE_PURPOSE,
             self.az.name)

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

@@ -59,7 +59,7 @@ def nsx_redo_metadata_cfg_for_az(az, edgeapi):
     LOG.info("Updating MetaData for availability zone: %s", az.name)
 
     # Get the list of internal networks for this AZ
-    db_net = nsxv_db.get_nsxv_internal_network(
+    db_net = nsxv_db.get_nsxv_internal_network_for_az(
         edgeapi.context.session,
         vcns_constants.InternalEdgePurposes.INTER_EDGE_PURPOSE,
         az.name)