travis: Automate updates to production-helper Nagios test.

This list was likely to end up out of date quickly, since it wasn't
documented that you need to update it when adding a queue.  The best
solution is to just not require it to be updated.

scripts/lib/queue_workers.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+import argparse
+import os
+import sys
+from os.path import dirname, abspath
+
+BASE_DIR = dirname(dirname(dirname(abspath(__file__))))
+sys.path.append(BASE_DIR)
+import scripts.lib.setup_path_on_import
+
+os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
+
+import django
+django.setup()
+from zerver.worker.queue_processors import get_active_worker_queues
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--queue_type', action='store', dest='queue_type', default=None,
+                        help="Specify which types of queues to list")
+    args = parser.parse_args()
+
+    workers = get_active_worker_queues(args.queue_type)
+    print(" ".join(workers))

tools/test-queue-worker-reload

@@ -17,6 +17,7 @@ sanity_check.check_venv(__file__)
 
 from typing import IO, Text
 
+# TODO: Convert this to use scripts/lib/queue_workers.py
 TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
 successful_worker_launches = [
     'launching queue worker thread error_reports',

tools/travis/production-helper

@@ -86,7 +86,10 @@ fi
 echo; echo "Now running RabbitMQ consumer Nagios tests"; echo
 # First run the check that usually runs in cron and populates the state files
 /home/zulip/deployments/current/scripts/nagios/check-rabbitmq-consumers
-for consumer in notify_tornado user_activity user_activity_interval user_presence invites signups message_sender feedback_messages error_reports digest_emails email_mirror missedmessage_mobile_notifications; do
+
+# Then, compute the list of all Django queue workers to run Nagios checks against
+consumer_list=$(/home/zulip/deployments/current/scripts/lib/queue_workers.py --queue_type=consumer)
+for consumer in $consumer_list; do
     if ! /usr/lib/nagios/plugins/zulip_app_frontend/check_rabbitmq_consumers "$consumer"; then
         set +x
         echo