[dhcp_server] Remove dependency in port-name-alias-map.txt.j2 (#17858)

* [dhcp_server] Remove dependency in port-name-alias-map.txt.j2

dockers/docker-dhcp-server/Dockerfile.j2

@@ -86,7 +86,7 @@ RUN apt-get clean -y        && \
 COPY ["docker_init.sh", "start.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
-COPY ["port-name-alias-map.txt.j2", "rsyslog/rsyslog.conf.j2", "kea-dhcp4.conf.j2", "/usr/share/sonic/templates/"]
+COPY ["rsyslog/rsyslog.conf.j2", "kea-dhcp4.conf.j2", "/usr/share/sonic/templates/"]
 COPY ["critical_processes", "/etc/supervisor/"]
 COPY ["lease_update.sh", "/etc/kea/"]
 COPY ["kea-dhcp4-init.conf", "/etc/kea/kea-dhcp4.conf"]

dockers/docker-dhcp-server/docker_init.sh

@@ -12,7 +12,6 @@ hostname=$(hostname)
 sonic-cfggen -d -t /usr/share/sonic/templates/rsyslog.conf.j2 \
     -a "{\"udp_server_ip\": \"$udp_server_ip\", \"hostname\": \"$hostname\"}" \
     > /etc/rsyslog.conf
-sonic-cfggen -d -t /usr/share/sonic/templates/port-name-alias-map.txt.j2,/tmp/port-name-alias-map.txt
 
 # Make the script that waits for all interfaces to come up executable
 chmod +x /etc/kea/lease_update.sh /usr/bin/start.sh

src/sonic-dhcp-utilities/dhcp_utilities/dhcpservd/dhcp_cfggen.py

@@ -7,7 +7,6 @@
 from jinja2 import Environment, FileSystemLoader
 from dhcp_utilities.common.utils import merge_intervals, validate_str_type, is_smart_switch
 
-PORT_MAP_PATH = "/tmp/port-name-alias-map.txt"
 UNICODE_TYPE = str
 DHCP_SERVER_IPV4 = "DHCP_SERVER_IPV4"
 DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS = "DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS"
@@ -35,14 +34,14 @@ class DhcpServCfgGenerator(object):
     lease_update_script_path = ""
     lease_path = ""
 
-    def __init__(self, dhcp_db_connector, lease_path=DEFAULT_LEASE_PATH, port_map_path=PORT_MAP_PATH,
+    def __init__(self, dhcp_db_connector, lease_path=DEFAULT_LEASE_PATH,
                  lease_update_script_path=LEASE_UPDATE_SCRIPT_PATH, dhcp_option_path=DHCP_OPTION_FILE,
                  kea_conf_template_path=KEA_DHCP4_CONF_TEMPLATE_PATH):
         self.db_connector = dhcp_db_connector
         self.lease_path = lease_path
         self.lease_update_script_path = lease_update_script_path
         # Read port alias map file, this file is render after container start, so it would not change any more
-        self._parse_port_map_alias(port_map_path)
+        self._parse_port_map_alias()
         # Get kea config template
         self._get_render_template(kea_conf_template_path)
         self._read_dhcp_option(dhcp_option_path)
@@ -166,14 +165,13 @@ def _get_render_template(self, kea_conf_template_path):
         env = Environment(loader=FileSystemLoader(os.path.dirname(kea_conf_template_path)))  # nosemgrep
         self.kea_template = env.get_template(os.path.basename(kea_conf_template_path))
 
-    def _parse_port_map_alias(self, port_map_path):
-        with open(port_map_path, "r") as file:
-            lines = file.readlines()
-            for line in lines:
-                splits = line.strip().split(" ")
-                if len(splits) != 2:
-                    continue
-                self.port_alias_map[splits[0]] = splits[1]
+    def _parse_port_map_alias(self):
+        port_table = self.db_connector.get_config_db_table("PORT")
+        pc_table = self.db_connector.get_config_db_table("PORTCHANNEL")
+        for port_name, item in port_table.items():
+            self.port_alias_map[port_name] = item.get("alias", port_name)
+        for pc_name in pc_table.keys():
+            self.port_alias_map[pc_name] = pc_name
 
     def _construct_obj_for_template(self, dhcp_server_ipv4, port_ips, hostname, customized_options):
         subnets = []

src/sonic-dhcp-utilities/tests/test_data/mock_config_db.json

@@ -180,5 +180,38 @@
                 "192.168.0.10"
             ]
         }
+    },
+    "PORT": {
+        "Ethernet0": {
+            "admin_status": "up",
+            "alias": "etp1",
+            "description": "Servers0:eth0",
+            "index": "1",
+            "lanes": "25",
+            "mtu": "9100",
+            "pfc_asym": "off",
+            "speed": "1000",
+            "tpid": "0x8100"
+        },
+        "Ethernet1": {
+            "admin_status": "up",
+            "alias": "etp2",
+            "description": "Servers1:eth0",
+            "index": "2",
+            "lanes": "26",
+            "mtu": "9100",
+            "pfc_asym": "off",
+            "speed": "1000",
+            "tpid": "0x8100"
+        }
+    },
+    "PORTCHANNEL": {
+        "PortChannel101": {
+            "admin_status": "up",
+            "lacp_key": "auto",
+            "min_links": "1",
+            "mtu": "9100",
+            "tpid": "0x8100"
+        }
     }
 }

src/sonic-dhcp-utilities/tests/test_dhcp_cfggen.py

@@ -268,10 +268,11 @@
 
 
 def test_parse_port_alias(mock_swsscommon_dbconnector_init, mock_get_render_template):
-    dhcp_db_connector = DhcpDbConnector()
-    dhcp_cfg_generator = DhcpServCfgGenerator(dhcp_db_connector,
-                                              port_map_path="tests/test_data/port-name-alias-map.txt")
-    assert dhcp_cfg_generator.port_alias_map == {"Ethernet24": "etp7", "Ethernet28": "etp8"}
+    with patch.object(DhcpDbConnector, "get_config_db_table", side_effect=mock_get_config_db_table):
+        dhcp_db_connector = DhcpDbConnector()
+        dhcp_cfg_generator = DhcpServCfgGenerator(dhcp_db_connector)
+        assert dhcp_cfg_generator.port_alias_map == {"Ethernet0": "etp1", "Ethernet1": "etp2",
+                                                     "PortChannel101": "PortChannel101"}
 
 
 @pytest.mark.parametrize("is_success", [True, False])

src/sonic-dhcp-utilities/tests/test_dhcpservd.py

@@ -29,10 +29,10 @@ def test_dump_dhcp4_config(mock_swsscommon_dbconnector_init, enabled_checker):
                       new_callable=PropertyMock), \
          patch.object(DhcpServdDbMonitor, "disable_checkers") as mock_unsubscribe, \
          patch.object(DhcpServdDbMonitor, "enable_checkers") as mock_subscribe, \
-         patch.object(DhcpServd, "enabled_checker", return_value=enabled_checker, new_callable=PropertyMock):
+         patch.object(DhcpServd, "enabled_checker", return_value=enabled_checker, new_callable=PropertyMock), \
+         patch.object(DhcpServCfgGenerator, "_parse_port_map_alias"):
         dhcp_db_connector = DhcpDbConnector()
         dhcp_cfg_generator = DhcpServCfgGenerator(dhcp_db_connector,
-                                                  port_map_path="tests/test_data/port-name-alias-map.txt",
                                                   kea_conf_template_path="tests/test_data/kea-dhcp4.conf.j2")
         dhcpservd = DhcpServd(dhcp_cfg_generator, dhcp_db_connector, None,
                               kea_dhcp4_config_path="/tmp/kea-dhcp4.conf")