[dhcp-relay]: dhcp/dhcpv6 per interface counter support (#16377)

Why I did it
Support DHCP/DHCPv6 per-interface counter, code change in sonic-build image.

Work item tracking
Microsoft ADO (17271822):

How I did it
- Introduce libjsoncpp-dev in dhcpmon and dhcprelay repo
- Show CLI changes after counter format change

How to verify it
- Manually run show command
- dhcpmon, dhcprelay integration tests

dockers/docker-dhcp-relay/Dockerfile.j2

@@ -13,6 +13,8 @@ ENV IMAGE_VERSION=$image_version
 # Update apt's cache of available packages
 RUN apt-get update
 
+RUN apt-get install -y libjsoncpp-dev
+
 {% if docker_dhcp_relay_debs.strip() -%}
 # Copy built Debian packages
 {{ copy_files("debs/", docker_dhcp_relay_debs.split(' '), "/debs/") }}

dockers/docker-dhcp-relay/cli-plugin-tests/test_show_dhcp6relay_counters.py

@@ -17,24 +17,21 @@ try:
 except KeyError:
     pass
 
-expected_counts = """\
-       Message Type     Vlan1000
--------------------  -----------
-            Unknown
-            Solicit
-          Advertise
-            Request
-            Confirm
-              Renew
-             Rebind
-              Reply
-            Release
-            Decline
-        Reconfigure
-Information-Request
-      Relay-Forward
-        Relay-Reply
-          Malformed
+expected_counts_v6 = """\
+  Message Type     Vlan1000(RX)
+--------------  ---------------
+
+  Message Type     Vlan1000(TX)
+--------------  ---------------
+
+"""
+
+expected_counts_v4 = """\
+  Message Type     Vlan1000(RX)
+--------------  ---------------
+
+  Message Type     Vlan1000(TX)
+--------------  ---------------
 
 """
 
@@ -43,5 +40,14 @@ class TestDhcp6RelayCounters(object):
     def test_show_counts(self):           
         runner = CliRunner()
         result = runner.invoke(show.dhcp6relay_counters.commands["counts"], ["-i Vlan1000"])
-        assert result.output == expected_counts
+        print(result.output)
+        assert result.output == expected_counts_v6
+
+class TestDhcpRelayCounters(object):
+
+    def test_show_counts(self):           
+        runner = CliRunner()
+        result = runner.invoke(show.dhcp4relay_counters.commands["counts"], ["-i Vlan1000"])
+        print(result.output)
+        assert result.output == expected_counts_v4
 

dockers/docker-dhcp-relay/cli/show/plugins/show_dhcp_relay.py

@@ -1,4 +1,5 @@
 import click
+import ast
 from natsort import natsorted
 from tabulate import tabulate
 import show.vlan as show_vlan
@@ -7,13 +8,20 @@ import utilities_common.cli as clicommon
 from swsscommon.swsscommon import ConfigDBConnector
 from swsscommon.swsscommon import SonicV2Connector
 
-
 # STATE_DB Table
+DHCPv4_COUNTER_TABLE = 'DHCP_COUNTER_TABLE'
 DHCPv6_COUNTER_TABLE = 'DHCPv6_COUNTER_TABLE'
 
+# DHCPv4 Counter Messages
+dhcpv4_messages = [
+    "Unknown", "Discover", "Offer", "Request", "Decline", "Ack", "Nack", "Release", "Inform"
+]
+
 # DHCPv6 Counter Messages
-messages = ["Unknown", "Solicit", "Advertise", "Request", "Confirm", "Renew", "Rebind", "Reply", "Release", "Decline",
-            "Reconfigure", "Information-Request", "Relay-Forward", "Relay-Reply", "Malformed"]
+dhcpv6_messages = [
+    "Unknown", "Solicit", "Advertise", "Request", "Confirm", "Renew", "Rebind", "Reply", "Release", 
+    "Decline", "Reconfigure", "Information-Request", "Relay-Forward", "Relay-Reply", "Malformed"
+]
 
 # DHCP_RELAY Config Table
 DHCP_RELAY = 'DHCP_RELAY'
@@ -37,6 +45,75 @@ def get_dhcp_helper_address(ctx, vlan):
 
 show_vlan.VlanBrief.register_column('DHCP Helper Address', get_dhcp_helper_address)
 
+class DHCPv4_Counter(object):
+    def __init__(self):
+        self.db = SonicV2Connector(use_unix_socket_path=False)
+        self.db.connect(self.db.STATE_DB)
+        self.table_name = DHCPv4_COUNTER_TABLE + self.db.get_db_separator(self.db.STATE_DB)
+
+    def get_interface(self):
+        """ Get all names of all interfaces in DHCPv4_COUNTER_TABLE """
+        interfaces = []
+        for key in self.db.keys(self.db.STATE_DB):
+            if DHCPv4_COUNTER_TABLE in key:
+                interfaces.append(key[21:])
+        return interfaces
+
+    def get_dhcp4relay_msg_count(self, interface, dir):
+        """ Get count of a dhcprelay message """
+        value = self.db.get(self.db.STATE_DB, self.table_name + str(interface), str(dir))
+        cnts = ast.literal_eval(str(value))
+        data = []
+        if cnts is not None:
+            for k, v in cnts.items():
+                data.append([k, v])
+        return data
+
+    def clear_table(self, interface):
+        """ Reset all message counts to 0 """
+        v4_cnts = {}
+        for msg in dhcpv4_messages:
+            v4_cnts[msg] = '0'
+        self.db.set(self.db.STATE_DB, self.table_name + str(interface), str("RX"), str(v4_cnts))
+        self.db.set(self.db.STATE_DB, self.table_name + str(interface), str("TX"), str(v4_cnts))
+
+def print_dhcpv4_count(counter, intf):
+    """Print count of each message"""
+    rx_data = counter.get_dhcp4relay_msg_count(intf, "RX")
+    print(tabulate(rx_data, headers=["Message Type", intf+"(RX)"], tablefmt='simple', stralign='right') + "\n")
+    tx_data = counter.get_dhcp4relay_msg_count(intf, "TX")
+    print(tabulate(tx_data, headers=["Message Type", intf+"(TX)"], tablefmt='simple', stralign='right') + "\n")
+
+#
+# 'dhcp4relay_counters' group ###
+#
+
+
+@click.group(cls=clicommon.AliasedGroup, name="dhcp4relay_counters")
+def dhcp4relay_counters():
+    """Show DHCPv4 counter"""
+    pass
+
+
+def ipv4_counters(interface):
+    counter = DHCPv4_Counter()
+    counter_intf = counter.get_interface()
+
+    if interface:
+        print_dhcpv4_count(counter, interface)
+    else:
+        for intf in counter_intf:
+            print_dhcpv4_count(counter, intf)
+
+
+# 'counts' subcommand ("show dhcp4relay_counters counts")
+@dhcp4relay_counters.command('counts')
+@click.option('-i', '--interface', required=False)
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+def counts(interface, verbose):
+    """Show dhcp4relay message counts"""
+    ipv4_counters(interface)
+
 
 class DHCPv6_Counter(object):
     def __init__(self):
@@ -46,30 +123,37 @@ class DHCPv6_Counter(object):
 
     def get_interface(self):
         """ Get all names of all interfaces in DHCPv6_COUNTER_TABLE """
-        vlans = []
+        interfaces = []
         for key in self.db.keys(self.db.STATE_DB):
             if DHCPv6_COUNTER_TABLE in key:
-                vlans.append(key[21:])
-        return vlans
+                interfaces.append(key[21:])
+        return interfaces
 
-    def get_dhcp6relay_msg_count(self, interface, msg):
+    def get_dhcp6relay_msg_count(self, interface, dir):
         """ Get count of a dhcp6relay message """
-        count = self.db.get(self.db.STATE_DB, self.table_name + str(interface), str(msg))
-        data = [str(msg), count]
+        value = self.db.get(self.db.STATE_DB, self.table_name + str(interface), str(dir))
+        cnts = ast.literal_eval(str(value))
+        data = []
+        if cnts is not None:
+            for k, v in cnts.items():
+                data.append([k, v])
         return data
 
     def clear_table(self, interface):
         """ Reset all message counts to 0 """
-        for msg in messages:
-            self.db.set(self.db.STATE_DB, self.table_name + str(interface), str(msg), '0')
+        v6_cnts = {}
+        for msg in dhcpv6_messages:
+            v6_cnts[msg] = '0'
+        self.db.set(self.db.STATE_DB, self.table_name + str(interface), str("RX"), str(v6_cnts))
+        self.db.set(self.db.STATE_DB, self.table_name + str(interface), str("TX"), str(v6_cnts))
 
 
-def print_count(counter, intf):
+def print_dhcpv6_count(counter, intf):
     """Print count of each message"""
-    data = []
-    for i in messages:
-        data.append(counter.get_dhcp6relay_msg_count(intf, i))
-    print(tabulate(data, headers=["Message Type", intf], tablefmt='simple', stralign='right') + "\n")
+    rx_data = counter.get_dhcp6relay_msg_count(intf, "RX")
+    print(tabulate(rx_data, headers=["Message Type", intf+"(RX)"], tablefmt='simple', stralign='right') + "\n")
+    tx_data = counter.get_dhcp6relay_msg_count(intf, "TX")
+    print(tabulate(tx_data, headers=["Message Type", intf+"(TX)"], tablefmt='simple', stralign='right') + "\n")
 
 
 #
@@ -88,10 +172,10 @@ def ipv6_counters(interface):
     counter_intf = counter.get_interface()
 
     if interface:
-        print_count(counter, interface)
+        print_dhcpv6_count(counter, interface)
     else:
         for intf in counter_intf:
-            print_count(counter, intf)
+            print_dhcpv6_count(counter, intf)
 
 
 # 'counts' subcommand ("show dhcp6relay_counters counts")
@@ -100,7 +184,6 @@ def ipv6_counters(interface):
 @click.option('--verbose', is_flag=True, help="Enable verbose output")
 def counts(interface, verbose):
     """Show dhcp6relay message counts"""
-
     ipv6_counters(interface)
 
 
@@ -199,6 +282,7 @@ def dhcp_relay_ip6counters(interface):
 
 
 def register(cli):
+    cli.add_command(dhcp4relay_counters)
     cli.add_command(dhcp6relay_counters)
     cli.add_command(dhcp_relay_helper)
     cli.add_command(dhcp_relay)

sonic-slave-bullseye/Dockerfile.j2

@@ -348,6 +348,7 @@ RUN apt-get update && apt-get install -y \
 # For DHCP Monitor tool
         libexplain-dev \
         libevent-dev \
+        libjsoncpp-dev \
 # For libyang
         swig \
 # For build dtb