Expose db.get_vlan_id_by_tag and db.get_vlan_tag_by_id()

Change-Id: I3b48a4bbd33fe46dfebae9994ca1a1035edf7a3c
diff --git a/admin.py b/admin.py
index 4acb13a..de563f1 100644
--- a/admin.py
+++ b/admin.py
@@ -283,6 +283,22 @@
                   default = None,
                   nargs = 1,
                   metavar = "<vlan_id>")
+vlan_group.add_option("--lookup_vlan_by_tag",
+                  dest = "lookup_vlan_by_tag",
+                  action = "store",
+                  type = "int",
+                  help = "Find the vlan ID of an existing vlan in the system",
+                  default = None,
+                  nargs = 1,
+                  metavar = "<tag>")
+vlan_group.add_option("--show_vlan_tag",
+                  dest = "show_vlan_tag",
+                  action = "store",
+                  type = "int",
+                  help = "Print the vlan tag of an existing vlan in the system",
+                  default = None,
+                  nargs = 1,
+                  metavar = "<vlan_id>")
 parser.add_option_group(vlan_group)
 
 (opts, args) = parser.parse_args()
@@ -517,6 +533,30 @@
             print 'No vlan found for vlan_id %d' % opts.show_vlan
     except InputError as inst:
         print 'Failed: %s' % inst
+elif opts.lookup_vlan_by_tag is not None:
+    try:
+        vlan_id = call_vland('db_query',
+                             {'command':'db.get_vlan_id_by_tag',
+                              'data':
+                              {'tag': opts.lookup_vlan_by_tag}})
+        if vlan_id is not None:
+            print vlan_id
+        else:
+            print 'No vlan found for vlan tag %d' % opts.lookup_vlan_by_tag
+    except InputError as inst:
+        print 'Failed: %s' % inst
+elif opts.show_vlan_tag is not None:
+    try:
+        vlan_tag = call_vland('db_query',
+                              {'command':'db.get_vlan_tag_by_id',
+                               'data':
+                               {'vlan_id': opts.show_vlan_tag}})
+        if vlan_tag is not None:
+            print vlan_tag
+        else:
+            print 'No vlan found for vlan id %d' % opts.show_vlan_tag
+    except InputError as inst:
+        print 'Failed: %s' % inst
 elif opts.status:
     print 'Config:'
     print '  knows about %d switch(es)' % len(config.switches)