Use async def instead of the deprecated asyncio.coroutine

graphql_server/flask/graphqlview.py

@@ -26,6 +26,7 @@
     GraphiQLOptions,
     render_graphiql_sync,
 )
+from graphql_server.utils import ensure_async
 
 
 class GraphQLView(View):
@@ -121,7 +122,7 @@ async def get_async_execution_results():
                     *(
                         ex
                         if ex is not None and is_awaitable(ex)
-                        else asyncio.coroutine(lambda: ex)()
+                        else ensure_async(lambda: ex)()
                         for ex in execution_results
                     )
                 )

graphql_server/utils.py

@@ -0,0 +1,25 @@
+import sys
+from typing import Awaitable, Callable, TypeVar
+
+if sys.version_info >= (3, 10):
+    from typing import ParamSpec
+else:
+    from typing_extensions import ParamSpec
+
+
+__all__ = ["ensure_async"]
+
+P = ParamSpec("P")
+R = TypeVar("R")
+
+
+def ensure_async(f: Callable[P, R]) -> Callable[P, Awaitable[R]]:
+    """Convert a sync callable (normal def or lambda) to a coroutine (async def).
+
+    This is similar to asyncio.coroutine which was deprecated in Python 3.8.
+    """
+
+    async def f_async(*args: P.args, **kwargs: P.kwargs) -> R:
+        return f(*args, **kwargs)
+
+    return f_async