Adding a clean arg parser and usage message

app.py

@@ -10,6 +10,8 @@ import asyncio
 import re
 import configparser
 import argparse
+import os.path
+import sys
 from operator import itemgetter
 
 import jwt
@@ -17,8 +19,9 @@ import websockets
 import requests
 from bottle import request, abort, Bottle, JSONPlugin
 from bottle_sqlite import SQLitePlugin
+from daemonize import Daemonize
 
-config = ConfigParser()
+config = configparser.ConfigParser()
 application = app = Bottle(autojson=False)
 app.install(SQLitePlugin(dbfile='call.db'))
 app.install(JSONPlugin(json_dumps=lambda s: json.dumps(s, cls=PiphoneJSONEncoder)))
@@ -361,12 +364,19 @@ class Call(object):
             phone_logger.exception(e)
             raise e
 
+def start():
+    global running
+    running = True
+    threads.submit(app.run)
+    loop.run_until_complete(listen())
+
 def stop():
     global running
     running = False
     ws.close()
     loop.close()
     threads.shutdown(wait=False)
+    sys.exit(0)
 
 @app.get('/calls/<callid>')
 @app.get('/calls/')
@@ -432,14 +442,27 @@ def originate(db, callid=None):
         abort(400, "Missing or incorrect fields, the call cannot be processed")
 
 if __name__ == '__main__':
-    global config
     arg_parser = argparse.ArgumentParser(description='Manage the SIP Backend for the piphone')
     arg_parser.add_argument('-c', '--config', help="Config file")
     arg_parser.parse_args()
-    config = ConfigParser(arg_parser.config)
     try:
-        running = True
-        threads.submit(app.run)
-        loop.run_until_complete(listen())
+        logging.debug("Let's use {} as a config file".config(arg_parser.config,))
+        config.read(arg_parser.config)
+    except AttributeError:
+        try:
+            if os.path.isfile('config.ini'):
+                logging.debug("Let's use config.ini as a config file")
+                config.read('config.ini')
+            elif os.path.isfile('/etc/piphone/config.ini'):
+                logging.debug("Let's use /etc/iphone/config.ini as a config file")
+                config.read('/etc/piphone/config.ini')
+            else:
+                raise Exception("No configuration file found (tried ./config.ini and /etc/piphone/config.ini")
+        except Exception as e:
+            phone_logger.error("Config file cannot be read")
+            arg_parser.print_help()
+            sys.exit(1)
+    try:
+        start()
     except:
         stop()