[db_migrator] add required "protocol" field in ROUTE_TABLE (sonic-net#2766)

- What I did
I added requires "protocol" field due to fpmsyncd reconcile logic (WarmRestartHelper class) requires old fvs keys to match new fvs.

- How I did it
Add "protocol" field in db migration.

- How to verify it
Upgrade from older branch to new image with supported FIB pending.

The field was added by sonic-net/sonic-swss#2551.

Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>

Author: stepanblyschak

scripts/db_migrator.py

@@ -594,18 +594,24 @@ def migrate_route_table(self):
         Handle route table migration. Migrations handled:
         1. 'weight' attr in ROUTE object was introduced 202205 onwards.
             Upgrade from older branch to 202205 will require this 'weight' attr to be added explicitly
+        2. 'protocol' attr in ROUTE introduced in 202305 onwards.
+            WarmRestartHelper reconcile logic requires to have "protocol" field in the old dumped ROUTE_TABLE.
         """
         route_table = self.appDB.get_table("ROUTE_TABLE")
         for route_prefix, route_attr in route_table.items():
+            if type(route_prefix) == tuple:
+                # IPv6 route_prefix is returned from db as tuple
+                route_key = "ROUTE_TABLE:" + ":".join(route_prefix)
+            else:
+                # IPv4 route_prefix is returned from db as str
+                route_key = "ROUTE_TABLE:{}".format(route_prefix)
+
             if 'weight' not in route_attr:
-                if type(route_prefix) == tuple:
-                    # IPv6 route_prefix is returned from db as tuple
-                    route_key = "ROUTE_TABLE:" + ":".join(route_prefix)
-                else:
-                    # IPv4 route_prefix is returned from db as str
-                    route_key = "ROUTE_TABLE:{}".format(route_prefix)
                 self.appDB.set(self.appDB.APPL_DB, route_key, 'weight','')
 
+            if 'protocol' not in route_attr:
+                self.appDB.set(self.appDB.APPL_DB, route_key, 'protocol', '')
+
     def update_edgezone_aggregator_config(self):
         """
         Update cable length configuration in ConfigDB for T0 neighbor interfaces

tests/db_migrator_input/appl_db/routes_migrate_expected.json

@@ -2,11 +2,13 @@
     "ROUTE_TABLE:192.168.104.0/25": {
         "nexthop": "10.0.0.57,10.0.0.59,10.0.0.61,10.0.0.63",
         "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104",
-        "weight": ""
+        "weight": "",
+        "protocol": ""
       },
     "ROUTE_TABLE:20c0:fe28:0:80::/64": {
-    "nexthop": "fc00::72,fc00::76,fc00::7a,fc00::7e",
-    "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104",
-    "weight": ""
+        "nexthop": "fc00::72,fc00::76,fc00::7a,fc00::7e",
+        "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104",
+        "weight": "",
+        "protocol": ""
     }
 }

tests/db_migrator_input/appl_db/routes_migrate_input.json

@@ -4,7 +4,7 @@
         "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104"
       },
     "ROUTE_TABLE:20c0:fe28:0:80::/64": {
-    "nexthop": "fc00::72,fc00::76,fc00::7a,fc00::7e",
-    "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104"
+        "nexthop": "fc00::72,fc00::76,fc00::7a,fc00::7e",
+        "ifname" : "PortChannel101,PortChannel102,PortChannel103,PortChannel104"
     }
 }

tests/db_migrator_test.py

@@ -551,7 +551,7 @@ def test_migrate_loopback_int(self):
             diff = DeepDiff(resulting_keys, expected_keys, ignore_order=True)
             assert not diff
 
-class TestWarmUpgrade_without_route_weights(object):
+class TestWarmUpgrade_without_required_attributes(object):
     @classmethod
     def setup_class(cls):
         os.environ['UTILITIES_UNIT_TESTING'] = "2"
@@ -562,7 +562,7 @@ def teardown_class(cls):
         dbconnector.dedicated_dbs['CONFIG_DB'] = None
         dbconnector.dedicated_dbs['APPL_DB'] = None
 
-    def test_migrate_weights_for_nexthops(self):
+    def test_migrate_weights_protocol_for_nexthops(self):
         dbconnector.dedicated_dbs['CONFIG_DB'] = os.path.join(mock_db_path, 'config_db', 'routes_migrate_input')
         dbconnector.dedicated_dbs['APPL_DB'] = os.path.join(mock_db_path, 'appl_db', 'routes_migrate_input')