Added more comments on logic.

files/image_config/caclmgrd/caclmgrd

@@ -16,6 +16,7 @@ try:
     import subprocess
     import sys
     import syslog
+
     import sonic_device_util
     from swsscommon import swsscommon
     from swsssdk import SonicDBConfig, ConfigDBConnector
@@ -448,28 +449,41 @@ class ControlPlaneAclManager(object):
     def run(self):
         # Select Time-out for 10 Seconds
         SELECT_TIMEOUT_MS = 1000 * 10
+        # Initlaize Global config that loads all database*.json
         swsscommon.SonicDBConfig.initializeGlobalConfig()
+        # Create the Select object
         sel = swsscommon.Select()
+        # Map of Namespace <--> susbcriber table's object
         config_db_subscriber_table_map = {}
+        # Loop through all asic namespaces (if present) and host (namespace='')
         for namespace in self.config_db_map.keys():
-            # Unconditionally update control plane ACLs once at start
+            # Unconditionally update control plane ACLs once at start on given namespace
             self.update_control_plane_acls(namespace)
-
+            # Connect to Config DB of given namespace
             acl_db_connector = swsscommon.DBConnector("CONFIG_DB", 0, False, namespace)
+            # Subscribe to notifications when ACL tables changes
             subscribe_acl_table = swsscommon.SubscriberStateTable(acl_db_connector, swsscommon.CFG_ACL_TABLE_TABLE_NAME)
+            # Subscribe to notifications when ACL rule tables changes
             subscribe_acl_rule_table = swsscommon.SubscriberStateTable(acl_db_connector, swsscommon.CFG_ACL_RULE_TABLE_NAME)
+            # Add both tables to the selectable object
             sel.addSelectable(subscribe_acl_table)
             sel.addSelectable(subscribe_acl_rule_table)
+            # Update the map
             config_db_subscriber_table_map[namespace] = []
             config_db_subscriber_table_map[namespace].append(subscribe_acl_table)
             config_db_subscriber_table_map[namespace].append(subscribe_acl_rule_table)
+        #Loop on select to see if any event happen on config db of any namespace
         while True:
             (state, c) = sel.select(SELECT_TIMEOUT_MS)
+            # Continue if select is timeout or selectable object is not return
             if state != swsscommon.Select.OBJECT:
                 continue
+            # Get the corresponding namespace from selectable object
             namespace = c.getDbNamespace()
+            # Pop data of both Subscriber Table object of namespace that got config db acl table event
             for table in config_db_subscriber_table_map[namespace]:
                 table.pop()
+            # Update the Control Plane ACL of the namespace that got config db acl table event
             self.update_control_plane_acls(namespace)
 
 # ============================= Functions =============================