--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/worker-queue.py	Mon Jul 18 14:04:50 2016 +0800
@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+import json
+import logging
+import sys
+from argparse import ArgumentParser, FileType, SUPPRESS
+from os.path import exists
+from subprocess import check_output, STDOUT
+from time import sleep
+
+import redis
+import yaml
+
+from candolint.queue import loop
+from candolint.utils import lookup_option, rel, timestamp
+
+
+def handle(isolation, rconn, change):
+    payload = json.loads(change)
+
+    config = rel('projects/{source}/{repo}.yml'.format(**payload))
+
+    if not exists(config):
+        logging.warn("Skipping %s (file doesn't exist: %r)", payload['repo'], config)
+        return
+
+    logging.info('Checking %s (payload: %r)', config, payload)
+    if isolation == 'none':
+        output = check_output([
+            sys.executable, '-u', rel('checker.py'), config, payload['change']
+        ], stderr=STDOUT)
+    elif isolation == 'docker':
+        output = check_output([
+            rel('check-in-docker.sh'), config, payload['change']
+        ], stderr=STDOUT)
+    logging.info('Checked %s', config)
+
+    payload.update({
+        'output': output,
+        'timestamp': timestamp()
+    })
+    rconn.rpush('candolint:queue:incoming', json.dumps(payload))
+
+
+def main():
+    parser = ArgumentParser(argument_default=SUPPRESS)
+    parser.add_argument(
+        '-c', '--config', type=FileType('r'),
+        help='configuration file (YAML)')
+    parser.add_argument(
+        '-i', '--isolation', choices=('none', 'docker'), default='docker',
+        help='select isolation level for the checker')
+    parser.add_argument(
+        '-d', '--debug', action='store_true', default=False,
+        help='enable debugging output')
+
+    group = parser.add_argument_group(
+        'queue configuration',
+        'these options that can also be specified in the configuration file')
+    group.add_argument('--redis-host', help='(default: 127.0.0.1)')
+    group.add_argument('--redis-port', type=int, help='(default: 6379)')
+    group.add_argument('--redis-password')
+
+    args = parser.parse_args()
+    config = yaml.safe_load(args.config) if hasattr(args, 'config') else {}
+
+    rhost = lookup_option('redis-host', args, config, default='127.0.0.1')
+    rport = lookup_option('redis-port', args, config, default=6379)
+    rpass = lookup_option('redis-password', args, config)
+
+    logging.basicConfig(
+        level=logging.DEBUG if args.debug else logging.INFO,
+        format='%(asctime)s %(levelname)-8s %(message)s')
+
+    def wrapper(rconn, change):
+        return handle(args.isolation, rconn, change)
+
+    while True:
+        logging.debug('Connecting to Redis server %s:%d', rhost, rport)
+        rconn = redis.StrictRedis(host=rhost, port=rport, password=rpass, db=0)
+        logging.info('Connected to Redis server')
+
+        try:
+            loop(rconn, 'candolint:queue:changes', wrapper)
+        except redis.exceptions.ConnectionError:
+            logging.warn('Connection to Redis lost, reconnecting in 1 minute')
+            sleep(60)
+
+
+if __name__ == '__main__':
+    main()