Minor: rename background task fluff

anonstream/__init__.py

@@ -60,16 +60,18 @@ def create_app(toml_config):
     app.stream_viewership = None
     app.last_info_task = None
 
-    # Background tasks' asyncio.sleep tasks, cancelled on shutdown
-    app.background_sleep = set()
+    # asyncio tasks to be cancelled on shutdown
+    app.tasks = set()
 
     # Queues for event socket clients
     app.event_queues = set()
 
     @app.after_serving
     async def shutdown():
-        # Force all background tasks to finish
-        for task in app.background_sleep:
+        # Cancel started asyncio tasks that would otherwise block shutdown
+        # The asyncio tasks we create are:
+        #   * quart background tasks awaiting asyncio.sleep()
+        for task in app.tasks:
             task.cancel()
 
     @app.before_serving

anonstream/events.py

@@ -6,8 +6,8 @@ import json
 
 from quart import current_app
 
-async def start_event_server_at(address):
-    return await asyncio.start_unix_server(serve_event_client, address)
+def start_event_server_at(address):
+    return asyncio.start_unix_server(serve_event_client, address)
 
 async def serve_event_client(reader, writer):
     reader.feed_eof()

anonstream/tasks.py

@@ -19,14 +19,13 @@ USERS = current_app.users
 CAPTCHAS = current_app.captchas
 CAPTCHA_SIGNER = current_app.captcha_signer
 
-async def sleep_and_collect_task(delay):
-    coro = asyncio.sleep(delay)
+async def cancel_on_shutdown(coro):
     task = asyncio.create_task(coro)
-    current_app.background_sleep.add(task)
+    current_app.tasks.add(task)
     try:
         await task
     finally:
-        current_app.background_sleep.remove(task)
+        current_app.tasks.remove(task)
 
 def with_period(period):
     def periodically(f):
@@ -35,7 +34,7 @@ def with_period(period):
             for iteration in itertools.count():
                 await f(iteration, *args, **kwargs)
                 try:
-                    await sleep_and_collect_task(period)
+                    await cancel_on_shutdown(asyncio.sleep(period))
                 except asyncio.CancelledError:
                     break