Signals Integration (#2160)

* Update some tests

* Resolve #2122 route decorator returning tuple

* Use rc sanic-routing version

* Update unit tests to <:str>

* Minimal working version with some signals implemented

* Add more http signals

* Update ASGI and change listeners to signals

* Allow for dynamic ODE signals

* Allow signals to be stacked

* Begin tests

* Prioritize match_info on keyword argument injection

* WIP on tests

* Compat with signals

* Work through some test coverage

* Passing tests

* Post linting

* Setup proper resets

* coverage reporting

* Fixes from vltr comments

* clear delayed tasks

* Fix bad test

* rm pycache

examples/run_async_advanced.py

@@ -1,29 +1,44 @@
-from sanic import Sanic
-from sanic import response
-from signal import signal, SIGINT
 import asyncio
+
+from signal import SIGINT, signal
+
 import uvloop
 
+from sanic import Sanic, response
+from sanic.server import AsyncioServer
+
+
 app = Sanic(__name__)
 
-@app.listener('after_server_start')
+
+@app.listener("after_server_start")
 async def after_start_test(app, loop):
     print("Async Server Started!")
 
+
 @app.route("/")
 async def test(request):
     return response.json({"answer": "42"})
 
+
 asyncio.set_event_loop(uvloop.new_event_loop())
-serv_coro = app.create_server(host="0.0.0.0", port=8000, return_asyncio_server=True)
+serv_coro = app.create_server(
+    host="0.0.0.0", port=8000, return_asyncio_server=True
+)
 loop = asyncio.get_event_loop()
 serv_task = asyncio.ensure_future(serv_coro, loop=loop)
 signal(SIGINT, lambda s, f: loop.stop())
-server = loop.run_until_complete(serv_task)
+server: AsyncioServer = loop.run_until_complete(serv_task)  # type: ignore
+server.startup()
+
+# When using app.run(), this actually triggers before the serv_coro.
+# But, in this example, we are using the convenience method, even if it is
+# out of order.
+server.before_start()
 server.after_start()
 try:
     loop.run_forever()
-except KeyboardInterrupt as e:
+except KeyboardInterrupt:
     loop.stop()
 finally:
     server.before_stop()