Add support for passing configuration files to rqworker.

This fixes #123.

rq/scripts/__init__.py

@@ -3,11 +3,13 @@ from rq import use_connection
 
 
 def add_standard_arguments(parser):
-    parser.add_argument('--host', '-H', default='localhost',
+    parser.add_argument('--config', '-c', default=None,
+            help='Module containing RQ settings.')
+    parser.add_argument('--host', '-H', default=None,
             help='The Redis hostname (default: localhost)')
-    parser.add_argument('--port', '-p', type=int, default=6379,
+    parser.add_argument('--port', '-p', default=None,
             help='The Redis portnumber (default: 6379)')
-    parser.add_argument('--db', '-d', type=int, default=0,
+    parser.add_argument('--db', '-d', type=int, default=None,
             help='The Redis database (default: 0)')
 
 

rq/scripts/rqworker.py

@@ -54,9 +54,27 @@ def parse_args():
     return parser.parse_args()
 
 
+def read_config_file(module):
+    """Reads all UPPERCASE variables defined in the given module file."""
+    settings = __import__(module, [], [], [], -1)
+    return {k: v for k, v in settings.__dict__.items() if k.upper() == k}
+
+
 def main():
     args = parse_args()
 
+    settings = {}
+    if args.config:
+        settings = read_config_file(args.config)
+
+    # Default arguments
+    if args.host is None:
+        args.host = settings.get('REDIS_HOST', 'localhost')
+    if args.port is None:
+        args.port = int(settings.get('REDIS_PORT', 6379))
+    if args.db is None:
+        args.db = settings.get('REDIS_DB', 0)
+
     if args.path:
         sys.path = args.path.split(':') + sys.path