Added some docstrings

app.py

@@ -1,4 +1,7 @@
 #!/usr/bin/env python3
+"""
+This is the top level module, containing the main application. Launching this file will launch the scheduler part of the consumer application.
+"""
 import sentry_sdk
 import time
 import os
@@ -8,10 +11,6 @@ from redis_super_storage import RedisSuperStorage
 from communicators import ConsumerCommunicator, ProducerCommunicator
 from ip_watchdog import IPWatchdog
 
-"""
-Scheduler
-"""
-
 __author__ = "@kocsisr"
 __copyright__ = "Copyright 2020, GoldenPogácsa Team"
 __module_name__ = "app"
@@ -20,13 +19,33 @@ __version__text__ = "1"
 sentry_sdk.init("https://0a106e104e114bc9a3fa47f9cb0db2f4@sentry.kmlabz.com/10")
 
 
-def get_initial_ip_list():
+def get_initial_ip_list() -> list:
+    """
+    This method is used to parse the content of INITIAL_SERVERS environment variable.
+    The contents of this variable is a list of ip addresses separated by commas.
+    This mehod returns a Python native `list` object containing the addreseses provided.
+
+    :return: A list of ip addresses provided by the environmental variable
+    """
     ip_list = os.environ['INITIAL_SERVERS'].split(',')
     logging.debug('Initial ip list ' + ", ".join(ip_list))
     return ip_list
 
 
 def main():
+    """
+    This is the main method of the scheduler application.
+
+    This method does basically the followings:
+     * Sets up logging
+     * Creates the RedisSuperStorage object (connecting to Redis database)
+     * Sets up communicators and IP watchdog
+     * Performs an initial synchronization to all other consumers.
+     * Starts the main loop which does roughly the following:
+        * Syncrhronizes with all other consumers
+        * Check if ip address changed. If yes, then push updates to all producers.
+        * Wait `RUN_INTERVAL` seconds (provided by envvar)
+    """
     # set logging preferences
     logging.basicConfig(filename='', level=logging.DEBUG)