tornado: Extract functions for Tornado queue names.

This moves all control for what queue to use for which realm in our
Tornado system to just the sharding.py file; no actual sharding is
done yet.

scripts/nagios/check-rabbitmq-consumers

@@ -54,13 +54,14 @@ queues = {
     'email_senders',
     'missedmessage_mobile_notifications',
     'outgoing_webhooks',
-    'notify_tornado',
     'signups',
     'slow_queries',
-    'tornado_return',
     'user_activity'
     'user_activity_interval',
     'user_presence',
+    # These queues may not be present if settings.TORNADO_PROCESSES > 1
+    'notify_tornado',
+    'tornado_return',
 }
 
 for queue_name in queues:

zerver/management/commands/runtornado.py

@@ -25,6 +25,7 @@ from zerver.tornado.application import create_tornado_application, \
 from zerver.tornado.autoreload import start as zulip_autoreload_start
 from zerver.tornado.event_queue import add_client_gc_hook, \
     missedmessage_hook, process_notification, setup_event_queue
+from zerver.tornado.sharding import notify_tornado_queue_name, tornado_return_queue_name
 from zerver.tornado.socket import respond_send_message
 
 if settings.USING_RABBITMQ:
@@ -90,8 +91,10 @@ class Command(BaseCommand):
             if settings.USING_RABBITMQ:
                 queue_client = get_queue_client()
                 # Process notifications received via RabbitMQ
-                queue_client.register_json_consumer('notify_tornado', process_notification)
+                queue_client.register_json_consumer(notify_tornado_queue_name(int(port)),
-                queue_client.register_json_consumer('tornado_return', respond_send_message)
+                                                    process_notification)
+                queue_client.register_json_consumer(tornado_return_queue_name(int(port)),
+                                                    respond_send_message)
 
             try:
                 # Application is an instance of Django's standard wsgi handler.

zerver/tornado/event_queue.py

@@ -30,7 +30,8 @@ from zerver.lib.queue import queue_json_publish
 from zerver.lib.request import JsonableError
 from zerver.tornado.descriptors import clear_descriptor_by_handler_id, set_descriptor_by_handler_id
 from zerver.tornado.exceptions import BadEventQueueIdError
-from zerver.tornado.sharding import get_tornado_uri
+from zerver.tornado.sharding import get_tornado_uri, get_tornado_port, \
+    notify_tornado_queue_name, tornado_return_queue_name
 import copy
 
 requests_client = requests.Session()
@@ -1005,6 +1006,7 @@ def send_event(realm: Realm, event: Mapping[str, Any],
     """`users` is a list of user IDs, or in the case of `message` type
     events, a list of dicts describing the users and metadata about
     the user/message pair."""
-    queue_json_publish("notify_tornado",
+    port = get_tornado_port(realm)
+    queue_json_publish(notify_tornado_queue_name(port),
                        dict(event=event, users=users),
                        lambda *args, **kwargs: send_notification_http(realm, *args, **kwargs))

zerver/tornado/sharding.py

@@ -13,3 +13,13 @@ def get_tornado_uri(realm: Realm) -> str:
 
     port = get_tornado_port(realm)
     return "http://127.0.0.1:%d" % (port,)
+
+def notify_tornado_queue_name(port: int) -> str:
+    if settings.TORNADO_PROCESSES == 1:
+        return "notify_tornado"
+    return "notify_tornado_port_%d" % (port,)
+
+def tornado_return_queue_name(port: int) -> str:
+    if settings.TORNADO_PROCESSES == 1:
+        return "tornado_return"
+    return "tornado_return_port_%d" % (port,)

zerver/tornado/socket.py

@@ -29,6 +29,7 @@ from zerver.lib.redis_utils import get_redis_client
 from zerver.lib.sessions import get_session_user
 from zerver.tornado.event_queue import get_client_descriptor
 from zerver.tornado.exceptions import BadEventQueueIdError
+from zerver.tornado.sharding import tornado_return_queue_name
 
 logger = logging.getLogger('zulip.socket')
 
@@ -220,7 +221,7 @@ class SocketConnection(sockjs.tornado.SockJSConnection):
                                 req_id=msg['req_id'],
                                 server_meta=dict(user_id=self.session.user_profile.id,
                                                  client_id=self.client_id,
-                                                 return_queue="tornado_return",
+                                                 return_queue=tornado_return_queue_name(self.port),
                                                  log_data=log_data,
                                                  request_environ=request_environ)))