Daemonize the worker.

workers/diffsworker.py

@@ -2,6 +2,7 @@ import logging
 import json
 import daemon
 import time
+import argparse
 
 from apscheduler.scheduler import Scheduler
 
@@ -29,13 +30,33 @@ def process_work_items():
   else:
     logger.debug('No work today.')
 
-FORMAT = '%(asctime)-15s - %(levelname)s - %(pathname)s - %(funcName)s - %(message)s'
-logging.basicConfig(format=FORMAT, level=logging.DEBUG)
 
-sched = Scheduler()
-sched.start()
+parser = argparse.ArgumentParser(description='Worker daemon to compute diffs')
+parser.add_argument('-D', action='store_true', default=False,
+                    help='Run the worker in daemon mode.')
+parser.add_argument('--log', default='diffsworker.log',
+                    help='Specify the log file for the worker as a daemon.')
+args = parser.parse_args()
 
-sched.add_interval_job(process_work_items, seconds=10)
+def start_worker(args):
+  FORMAT = '%(asctime)-15s - %(levelname)s - %(pathname)s - %(funcName)s - %(message)s'
 
-while True:
-  time.sleep(60 * 60 * 24)  # sleep one day, basically forever
+  if args.D:
+    logging.basicConfig(filename=args.log, format=FORMAT, level=logging.DEBUG)
+  else:
+    logging.basicConfig(format=FORMAT, level=logging.DEBUG)    
+
+  sched = Scheduler()
+  sched.start()
+
+  sched.add_interval_job(process_work_items, seconds=10)
+
+  while True:
+    time.sleep(60 * 60 * 24)  # sleep one day, basically forever
+
+if args.D:
+  with daemon.DaemonContext():
+    start_worker(args)
+
+else:
+  start_worker(args)