Updates branch sol006 with master

[osm/LCM.git] / osm_lcm / lcm_hc.py

diff --git a/osm_lcm/lcm_hc.py b/osm_lcm/lcm_hc.py
new file mode 100644 (file)
index 0000000..701e5b6
--- /dev/null
+++ b/osm_lcm/lcm_hc.py
@@ -0,0 +1,48 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+##
+# Copyright 2018 Telefonica S.A.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+##
+
+from os import path
+from time import time, sleep
+from sys import stderr
+
+""" This module is used for helth check. A file called time_last_ping is used 
+This contains the last time where something is received from kafka
+"""
+
+
+def health_check(health_check_file=None, ping_interval_pace=120):
+    health_check_file = health_check_file or path.expanduser("~") + "/time_last_ping"
+    retry = 2
+    while retry:
+        retry -= 1
+        try:
+            with open(health_check_file, "r") as f:
+                last_received_ping = f.read()
+
+            if time() - float(last_received_ping) < 2 * ping_interval_pace:  # allow one ping not received every two
+                exit(0)
+        except Exception as e:
+            print(e, file=stderr)
+        if retry:
+            sleep(6)
+    exit(1)
+
+
+if __name__ == '__main__':
+    health_check()