[dhcp_server] add show dhcp server info (#17468)

* add show dhcp server info

dockers/docker-dhcp-server/cli-plugin-tests/mock_config_db.json

@@ -7,9 +7,7 @@
         "lease_time": "3600",
         "mode": "PORT",
         "netmask": "255.255.255.0",
-        "customized_options": [
+        "customized_options": "option60",
-            "option60"
-        ],
         "state": "enabled"
     },
     "DHCP_SERVER_IPV4_CUSTOMIZED_OPTIONS|option60": {

dockers/docker-dhcp-server/cli-plugin-tests/test_show_dhcp_server.py

@@ -110,3 +110,42 @@ range3   100.1.1.10  100.1.1.10           1
         assert result.exit_code == 0, "exit code: {}, Exception: {}, Traceback: {}".format(result.exit_code, result.exception, result.exc_info)
         assert result.stdout == expected_stdout
 
+    def test_show_dhcp_server_ipv4_info_without_intf(self, mock_db):
+        expected_stdout = """\
+Interface    Mode    Gateway    Netmask          Lease Time(s)  State
+-----------  ------  ---------  -------------  ---------------  -------
+Vlan100      PORT    100.1.1.1  255.255.255.0             3600  enabled
+"""
+        runner = CliRunner()
+        db = clicommon.Db()
+        db.db = mock_db
+        result = runner.invoke(show_dhcp_server.dhcp_server.commands["ipv4"].commands["info"], [], obj=db)
+        assert result.exit_code == 0, "exit code: {}, Exception: {}, Traceback: {}".format(result.exit_code, result.exception, result.exc_info)
+        assert result.stdout == expected_stdout
+
+    def test_show_dhcp_server_ipv4_info_with_intf(self, mock_db):
+        expected_stdout = """\
+Interface    Mode    Gateway    Netmask          Lease Time(s)  State
+-----------  ------  ---------  -------------  ---------------  -------
+Vlan100      PORT    100.1.1.1  255.255.255.0             3600  enabled
+"""
+        runner = CliRunner()
+        db = clicommon.Db()
+        db.db = mock_db
+        result = runner.invoke(show_dhcp_server.dhcp_server.commands["ipv4"].commands["info"], ["Vlan100"], obj=db)
+        assert result.exit_code == 0, "exit code: {}, Exception: {}, Traceback: {}".format(result.exit_code, result.exception, result.exc_info)
+        assert result.stdout == expected_stdout
+
+    def test_show_dhcp_server_ipv4_info_with_customized_options(self, mock_db):
+        expected_stdout = """\
+Interface    Mode    Gateway    Netmask          Lease Time(s)  State    Customized Options
+-----------  ------  ---------  -------------  ---------------  -------  --------------------
+Vlan100      PORT    100.1.1.1  255.255.255.0             3600  enabled  option60
+"""
+        runner = CliRunner()
+        db = clicommon.Db()
+        db.db = mock_db
+        result = runner.invoke(show_dhcp_server.dhcp_server.commands["ipv4"].commands["info"], ["Vlan100", "--with_customized_options"], obj=db)
+        assert result.exit_code == 0, "exit code: {}, Exception: {}, Traceback: {}".format(result.exit_code, result.exception, result.exc_info)
+        assert result.stdout == expected_stdout
+

dockers/docker-dhcp-server/cli/show/plugins/show_dhcp_server.py

@@ -79,5 +79,26 @@ def range(db, range_name):
     click.echo(tabulate(table, headers=headers))
 
 
+@ipv4.command()
+@click.argument('dhcp_interface', required=False)
+@click.option('--with_customized_options', default=False, is_flag=True)
+@clicommon.pass_db
+def info(db, dhcp_interface, with_customized_options):
+    if not dhcp_interface:
+        dhcp_interface = "*"
+    headers = ["Interface", "Mode", "Gateway", "Netmask", "Lease Time(s)", "State"]
+    if with_customized_options:
+        headers.append("Customized Options")
+    table = []
+    dbconn = db.db
+    for key in dbconn.keys("CONFIG_DB", "DHCP_SERVER_IPV4|" + dhcp_interface):
+        entry = dbconn.get_all("CONFIG_DB", key)
+        interface = key.split("|")[1]
+        table.append([interface, entry["mode"], entry["gateway"], entry["netmask"], entry["lease_time"], entry["state"]])
+        if with_customized_options:
+            table[-1].append(entry["customized_options"])
+    click.echo(tabulate(table, headers=headers))
+
+
 def register(cli):
     cli.add_command(dhcp_server)