Trigger http.lifecycle.request signal in ASGI mode (#2451)

Co-authored-by: Adam Hopkins <adam@amhopkins.com>

sanic/asgi.py

@@ -163,6 +163,13 @@ class ASGIApp:
             instance.request_body = True
             instance.request.conn_info = ConnInfo(instance.transport)
 
+            await sanic_app.dispatch(
+                "http.lifecycle.request",
+                inline=True,
+                context={"request": instance.request},
+                fail_not_found=False,
+            )
+
         return instance
 
     async def read(self) -> Optional[bytes]:

tests/test_asgi.py

@@ -13,6 +13,7 @@ from sanic.exceptions import BadRequest, Forbidden, ServiceUnavailable
 from sanic.request import Request
 from sanic.response import json, text
 from sanic.server.websockets.connection import WebSocketConnection
+from sanic.signals import RESERVED_NAMESPACES
 
 
 @pytest.fixture
@@ -513,3 +514,34 @@ async def test_request_exception_suppressed_by_middleware(app):
 
     _, response = await app.asgi_client.get("/error-prone")
     assert response.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_signals_triggered(app):
+    @app.get("/test_signals_triggered")
+    async def _request(request):
+        return text("test_signals_triggered")
+
+    signals_triggered = []
+    signals_expected = [
+        # "http.lifecycle.begin",
+        # "http.lifecycle.read_head",
+        "http.lifecycle.request",
+        "http.lifecycle.handle",
+        "http.routing.before",
+        "http.routing.after",
+        "http.lifecycle.response",
+        # "http.lifecycle.send",
+        # "http.lifecycle.complete",
+    ]
+
+    def signal_handler(signal):
+        return lambda *a, **kw: signals_triggered.append(signal)
+
+    for signal in RESERVED_NAMESPACES["http"]:
+        app.signal(signal)(signal_handler(signal))
+
+    _, response = await app.asgi_client.get("/test_signals_triggered")
+    assert response.status_code == 200
+    assert response.text == "test_signals_triggered"
+    assert signals_triggered == signals_expected