Make asyncio default task impl (#500)

granian/server.py

@@ -14,7 +14,7 @@
 
 from ._futures import _future_watcher_wrapper, _new_cbscheduler
 from ._granian import ASGIWorker, RSGIWorker, WSGIWorker
-from ._imports import anyio, setproctitle, watchfiles
+from ._imports import setproctitle, watchfiles
 from ._internal import load_target
 from ._signals import set_main_signals
 from .asgi import LifespanProtocol, _callback_wrapper as _asgi_call_wrap
@@ -728,8 +728,12 @@ def serve(
                 logger.error('Workers lifetime cannot be less than 60 seconds')
                 raise ConfigurationError('workers_lifetime')
 
+        # FIXME: `rust` impl seems to mem-leak
         if self.task_impl == TaskImpl.auto:
-            self.task_impl = TaskImpl.asyncio if anyio is not None else TaskImpl.rust
+            # self.task_impl = TaskImpl.asyncio if anyio is not None else TaskImpl.rust
+            self.task_impl = TaskImpl.asyncio
+        if self.task_impl == TaskImpl.rust:
+            logger.warning('Rust task implementation is still experimental and might cause memory leaks!')
 
         serve_method = self._serve_with_reloader if self.reload_on_changes else self._serve
         serve_method(spawn_target, target_loader)

pyproject.toml

@@ -98,7 +98,7 @@ extend-ignore = [
     'S110', # except pass is fine
 ]
 flake8-quotes = { inline-quotes = 'single', multiline-quotes = 'double' }
-mccabe = { max-complexity = 14 }
+mccabe = { max-complexity = 15 }
 
 [tool.ruff.format]
 quote-style = 'single'

tests/apps/asgi.py

@@ -174,5 +174,5 @@ def app(scope, receive, send):
         '/err_app': err_app,
         '/err_proto': err_proto,
         '/timeout_n': timeout_n,
-        '/timeout_w': timeout_w
+        '/timeout_w': timeout_w,
     }.get(scope['path'], info)(scope, receive, send)