stop multiple worker server without sleep loop; issue #73

sanic/sanic.py

@@ -3,8 +3,8 @@ from collections import deque
 from functools import partial
 from inspect import isawaitable, stack, getmodulename
 from multiprocessing import Process, Event
+from select import select
 from signal import signal, SIGTERM, SIGINT
-from time import sleep
 from traceback import format_exc
 import logging
 
@@ -352,8 +352,7 @@ class Sanic:
 
         # Infinitely wait for the stop event
         try:
-            while not stop_event.is_set():
-                sleep(0.3)
+            select(stop_event)
         except:
             pass
 

tests/test_multiprocessing.py

@@ -1,5 +1,5 @@
 from multiprocessing import Array, Event, Process
-from time import sleep
+from time import sleep, time
 from ujson import loads as json_loads
 
 from sanic import Sanic
@@ -51,3 +51,27 @@ def skip_test_multiprocessing():
         raise ValueError("Expected JSON response but got '{}'".format(response))
 
     assert results.get('test') == True
+
+
+def test_drain_connections():
+    app = Sanic('test_json')
+
+    @app.route('/')
+    async def handler(request):
+        return json({"test": True})
+
+    stop_event = Event()
+    async def after_start(*args, **kwargs):
+        http_response = await local_request('get', '/')
+        stop_event.set()
+
+    start = time()
+    app.serve_multiple({
+        'host': HOST,
+        'port': PORT,
+        'after_start': after_start,
+        'request_handler': app.handle_request,
+    }, workers=2, stop_event=stop_event)
+    end = time()
+
+    assert end - start < 0.05