Event Counters CLI (sonic-net#2449)

Add CLI for event_counters

show/main.py

@@ -336,6 +336,32 @@ def vrf(vrf_name):
                     body.append(["", intf])
     click.echo(tabulate(body, header))
 
+#
+# 'events' command ("show event-counters")
+#
+
+@cli.command()
+def event_counters():
+    """Show events counter"""
+    # dump keys as formatted
+    counters_db = SonicV2Connector(host='127.0.0.1')
+    counters_db.connect(counters_db.COUNTERS_DB, retry_on=False)
+
+    header = ['name', 'count']
+    keys = counters_db.keys(counters_db.COUNTERS_DB, 'COUNTERS_EVENTS*')
+    table = []
+
+    for key in natsorted(keys):
+        key_list = key.split(':')
+        data_dict = counters_db.get_all(counters_db.COUNTERS_DB, key)
+        table.append((key_list[1], data_dict["value"]))
+
+    if table:
+        click.echo(tabulate(table, header, tablefmt='simple', stralign='right'))
+    else:
+        click.echo('No data available in COUNTERS_EVENTS\n')
+
+
 #
 # 'arp' command ("show arp")
 #

tests/event_counters_input/counters_db.json

@@ -0,0 +1,18 @@
+{
+    "COUNTERS_EVENTS:latency_in_ms": {
+        "value": 2
+    },
+    "COUNTERS_EVENTS:missed_to_cache": {
+        "value": 0
+    },
+    "COUNTERS_EVENTS:missed_internal": {
+        "value": 0
+    },
+    "COUNTERS_EVENTS:missed_by_slow_receiver": {
+        "value": 0
+    },
+    "COUNTERS_EVENTS:published": {
+        "value": 40147
+    }
+}
+

tests/show_event_counters_test.py

@@ -0,0 +1,37 @@
+import os
+import sys
+from click.testing import CliRunner
+from utilities_common.db import Db
+import show.main as show
+
+class TestShowEventCounters(object):
+    @classmethod
+    def setup_class(cls):
+        print("SETUP")
+        os.environ["UTILITIES_UNIT_TESTING"] = "1"
+
+    def test_event_counters_show(self):
+        from .mock_tables import dbconnector
+        test_path = os.path.dirname(os.path.abspath(__file__))
+        mock_db_path = os.path.join(test_path, "event_counters_input")
+        jsonfile_counters = os.path.join(mock_db_path, "counters_db")
+        dbconnector.dedicated_dbs['COUNTERS_DB'] = jsonfile_counters
+        runner = CliRunner()
+        db = Db()
+        expected_output = """\
+                   name    count
+-----------------------  -------
+          latency_in_ms        2
+missed_by_slow_receiver        0
+        missed_internal        0
+        missed_to_cache        0
+              published    40147
+"""
+
+        result = runner.invoke(show.cli.commands['event-counters'], [], obj=db)
+        print(result.exit_code)
+        print(result.output)
+        dbconnector.dedicated_dbs['COUNTERS_DB'] = None
+        assert result.exit_code == 0
+        assert result.output == expected_output
+