Fix idom.run uvicorn self.servers exception (#943)

docs/source/about/contributor-guide.rst

@@ -140,23 +140,17 @@ followed the `earlier instructions <Development Environment>`_. The suite covers
 
 3. Client-side Javascript code with UVU_
 
-Before running the test suite you'll need to install the required browsers by running:
-
-.. code-block:: bash
-
-    playwright install
-
 Once you've installed them you'll be able to run:
 
 .. code-block:: bash
 
-    nox -s test
+    nox -s check-python-tests
 
 You can observe the browser as the tests are running by passing an extra flag:
 
 .. code-block:: bash
 
-    nox -s test -- --headed
+    nox -s check-python-tests -- --headed
 
 To see a full list of available commands (e.g. ``nox -s <your-command>``) run:
 

src/reactpy/backend/_common.py

@@ -6,9 +6,8 @@
 from pathlib import Path, PurePosixPath
 from typing import Any, Awaitable, Sequence, cast
 
+import uvicorn
 from asgiref.typing import ASGIApplication
-from uvicorn.config import Config as UvicornConfig
-from uvicorn.server import Server as UvicornServer
 
 from reactpy import __file__ as _reactpy_file_path
 from reactpy import html
@@ -31,29 +30,35 @@ async def serve_development_asgi(
     port: int,
     started: asyncio.Event | None,
 ) -> None:
-    """Run a development server for starlette"""
-    server = UvicornServer(
-        UvicornConfig(
+    """Run a development server for an ASGI application"""
+    server = uvicorn.Server(
+        uvicorn.Config(
             app,
             host=host,
             port=port,
             loop="asyncio",
             reload=True,
         )
     )
-
+    server.config.setup_event_loop()
     coros: list[Awaitable[Any]] = [server.serve()]
 
+    # If a started event is provided, then use it signal based on `server.started`
     if started:
         coros.append(_check_if_started(server, started))
 
     try:
         await asyncio.gather(*coros)
     finally:
+        # Since we aren't using the uvicorn's `run()` API, we can't guarantee uvicorn's
+        # order of operations. So we need to make sure `shutdown()` always has an initialized
+        # list of `self.servers` to use.
+        if not hasattr(server, "servers"):  # pragma: no cover
+            server.servers = []
         await asyncio.wait_for(server.shutdown(), timeout=3)
 
 
-async def _check_if_started(server: UvicornServer, started: asyncio.Event) -> None:
+async def _check_if_started(server: uvicorn.Server, started: asyncio.Event) -> None:
     while not server.started:
         await asyncio.sleep(0.2)
     started.set()

src/reactpy/backend/flask.py

@@ -129,8 +129,8 @@ def use_request() -> Request:
 def use_connection() -> Connection[_FlaskCarrier]:
     """Get the current :class:`Connection`"""
     conn = _use_connection()
-    if not isinstance(conn.carrier, _FlaskCarrier):
-        raise TypeError(  # pragma: no cover
+    if not isinstance(conn.carrier, _FlaskCarrier):  # pragma: no cover
+        raise TypeError(
             f"Connection has unexpected carrier {conn.carrier}. "
             "Are you running with a Flask server?"
         )

src/reactpy/backend/sanic.py

@@ -4,7 +4,7 @@
 import json
 import logging
 from dataclasses import dataclass
-from typing import Any, MutableMapping, Tuple
+from typing import Any, Tuple
 from urllib import parse as urllib_parse
 from uuid import uuid4
 
@@ -82,8 +82,8 @@ def use_websocket() -> WebSocketConnection:
 def use_connection() -> Connection[_SanicCarrier]:
     """Get the current :class:`Connection`"""
     conn = _use_connection()
-    if not isinstance(conn.carrier, _SanicCarrier):
-        raise TypeError(  # pragma: no cover
+    if not isinstance(conn.carrier, _SanicCarrier):  # pragma: no cover
+        raise TypeError(
             f"Connection has unexpected carrier {conn.carrier}. "
             "Are you running with a Sanic server?"
         )
@@ -162,11 +162,9 @@ async def model_stream(
         request: request.Request, socket: WebSocketConnection, path: str = ""
     ) -> None:
         asgi_app = getattr(request.app, "_asgi_app", None)
-        if asgi_app is None:  # pragma: no cover
+        scope = asgi_app.transport.scope if asgi_app else {}
+        if not scope:  # pragma: no cover
             logger.warning("No scope. Sanic may not be running with an ASGI server")
-            scope: MutableMapping[str, Any] = {}
-        else:
-            scope = asgi_app.transport.scope
 
         send, recv = _make_send_recv_callbacks(socket)
         await serve_layout(

src/reactpy/backend/starlette.py

@@ -78,8 +78,8 @@ def use_websocket() -> WebSocket:
 
 def use_connection() -> Connection[WebSocket]:
     conn = _use_connection()
-    if not isinstance(conn.carrier, WebSocket):
-        raise TypeError(  # pragma: no cover
+    if not isinstance(conn.carrier, WebSocket):  # pragma: no cover
+        raise TypeError(
             f"Connection has unexpected carrier {conn.carrier}. "
             "Are you running with a Flask server?"
         )

src/reactpy/backend/tornado.py

@@ -100,8 +100,8 @@ def use_request() -> HTTPServerRequest:
 
 def use_connection() -> Connection[HTTPServerRequest]:
     conn = _use_connection()
-    if not isinstance(conn.carrier, HTTPServerRequest):
-        raise TypeError(  # pragma: no cover
+    if not isinstance(conn.carrier, HTTPServerRequest):  # pragma: no cover
+        raise TypeError(
             f"Connection has unexpected carrier {conn.carrier}. "
             "Are you running with a Flask server?"
         )

src/reactpy/backend/utils.py

@@ -85,10 +85,8 @@ def all_implementations() -> Iterator[BackendImplementation[Any]]:
             logger.debug(f"Failed to import {name!r}", exc_info=True)
             continue
 
-        if not isinstance(module, BackendImplementation):
-            raise TypeError(  # pragma: no cover
-                f"{module.__name__!r} is an invalid implementation"
-            )
+        if not isinstance(module, BackendImplementation):  # pragma: no cover
+            raise TypeError(f"{module.__name__!r} is an invalid implementation")
 
         yield module