Simplify argparse usage (#380)

Refactor argument parsing to use argparse Namespace object for
structured access.

bin/receiver.py

@@ -51,23 +51,23 @@ def main():
                             action='version',
                             version=ver)
 
-    # Using the vars function to output a dict-like view rather than Namespace object.
-    options = vars(arg_parser.parse_args())
+    # Parsing arguments into an argparse.Namespace object for structured access.
+    options = arg_parser.parse_args()
 
     # Deprecating functionality.
     old_log_config_default_path = '/etc/apel/logging.cfg'
-    if (os.path.exists(old_log_config_default_path) or options['log_config'] is not None):
+    if (os.path.exists(old_log_config_default_path) or options.log_config is not None):
         logging.warning('Separate logging config file option has been deprecated.')
 
     # Absolute file path required when refreshing dn_file, relative path resulted in an error.
-    options['dn_file'] = os.path.abspath(options['dn_file'])
+    options.dn_file = os.path.abspath(options.dn_file)
 
     # Check if config file exists using os.path.isfile function.
-    if os.path.isfile(options['config']):
+    if os.path.isfile(options.config):
         cp = configparser.ConfigParser({'use_ssl': 'true'})
-        cp.read(options['config'])
+        cp.read(options.config)
     else:
-        print("Config file not found at", options['config'])
+        print("Config file not found at", options.config)
         sys.exit(1)
 
     # Check for pidfile
@@ -90,7 +90,7 @@ def main():
     brokers, project, token = ssm.agents.get_ssm_args(protocol, cp, log)
 
     ssm.agents.run_receiver(protocol, brokers, project, token,
-                            cp, log, options['dn_file'])
+                            cp, log, options.dn_file)
 
 
 if __name__ == '__main__':

bin/sender.py

@@ -46,20 +46,20 @@ def main():
                             action='version',
                             version=ver)
 
-    # Using the vars function to output a dict-like view rather than Namespace object.
-    options = vars(arg_parser.parse_args())
+    # Parsing arguments into an argparse.Namespace object for structured access.
+    options = arg_parser.parse_args()
 
     # Deprecating functionality.
     old_log_config_default_path = '/etc/apel/logging.cfg'
-    if (os.path.exists(old_log_config_default_path) or options['log_config'] is not None):
+    if (os.path.exists(old_log_config_default_path) or options.log_config is not None):
         logging.warning('Separate logging config file option has been deprecated.')
 
     # Check if config file exists using os.path.isfile function.
-    if os.path.isfile(options['config']):
+    if os.path.isfile(options.config):
         cp = configparser.ConfigParser({'use_ssl': 'true'})
-        cp.read(options['config'])
+        cp.read(options.config)
     else:
-        print("Config file not found at", options['config'])
+        print("Config file not found at", options.config)
         sys.exit(1)
 
     ssm.agents.logging_helper(cp)