Keep asyncio task ref when running callbacks (#441)

Author: gi0baro

src/asgi/callbacks.rs

@@ -1,6 +1,9 @@
 use pyo3::prelude::*;
 use pyo3::types::PyDict;
-use std::{net::SocketAddr, sync::Arc};
+use std::{
+    net::SocketAddr,
+    sync::{Arc, Mutex},
+};
 use tokio::sync::oneshot;
 
 use super::{
@@ -117,6 +120,7 @@ pub(crate) struct CallbackWrappedRunnerHTTP {
     cb: PyObject,
     #[pyo3(get)]
     scope: PyObject,
+    pytaskref: Arc<Mutex<Option<PyObject>>>,
 }
 
 impl CallbackWrappedRunnerHTTP {
@@ -126,6 +130,7 @@ impl CallbackWrappedRunnerHTTP {
             context: cb.context,
             cb: cb.callback.clone_ref(py),
             scope: scope.into_py(py),
+            pytaskref: Arc::new(Mutex::new(None)),
         }
     }
 
@@ -140,10 +145,12 @@ impl CallbackWrappedRunnerHTTP {
 
     fn done(&self) {
         callback_impl_done_http!(self);
+        self.pytaskref.lock().unwrap().take();
     }
 
     fn err(&self, err: Bound<PyAny>) {
         callback_impl_done_err!(self, &PyErr::from_value_bound(err));
+        self.pytaskref.lock().unwrap().take();
     }
 }
 
@@ -238,6 +245,7 @@ pub(crate) struct CallbackWrappedRunnerWebsocket {
     cb: PyObject,
     #[pyo3(get)]
     scope: PyObject,
+    pytaskref: Arc<Mutex<Option<PyObject>>>,
 }
 
 impl CallbackWrappedRunnerWebsocket {
@@ -247,6 +255,7 @@ impl CallbackWrappedRunnerWebsocket {
             context: cb.context,
             cb: cb.callback.clone_ref(py),
             scope: scope.into_py(py),
+            pytaskref: Arc::new(Mutex::new(None)),
         }
     }
 
@@ -261,10 +270,12 @@ impl CallbackWrappedRunnerWebsocket {
 
     fn done(&self) {
         callback_impl_done_ws!(self);
+        self.pytaskref.lock().unwrap().take();
     }
 
     fn err(&self, err: Bound<PyAny>) {
         callback_impl_done_err!(self, &PyErr::from_value_bound(err));
+        self.pytaskref.lock().unwrap().take();
     }
 }
 

src/callbacks.rs

@@ -300,10 +300,15 @@ macro_rules! callback_impl_run {
 macro_rules! callback_impl_run_pytask {
     () => {
         pub fn run(self, py: Python<'_>) -> PyResult<Bound<PyAny>> {
+            let taskref = self.pytaskref.clone();
             let event_loop = self.context.event_loop(py);
             let context = self.context.context(py);
             let target = self.into_py(py).getattr(py, pyo3::intern!(py, "_loop_task"))?;
             let kwctx = pyo3::types::PyDict::new_bound(py);
+            {
+                let mut taskref_guard = taskref.lock().unwrap();
+                *taskref_guard = Some(target.clone_ref(py));
+            }
             kwctx.set_item(pyo3::intern!(py, "context"), context)?;
             event_loop.call_method(pyo3::intern!(py, "call_soon_threadsafe"), (target,), Some(&kwctx))
         }

src/rsgi/callbacks.rs

@@ -1,4 +1,5 @@
 use pyo3::prelude::*;
+use std::sync::{Arc, Mutex};
 use tokio::sync::oneshot;
 
 use super::{
@@ -114,6 +115,7 @@ pub(crate) struct CallbackWrappedRunnerHTTP {
     cb: PyObject,
     #[pyo3(get)]
     scope: PyObject,
+    pytaskref: Arc<Mutex<Option<PyObject>>>,
 }
 
 impl CallbackWrappedRunnerHTTP {
@@ -123,6 +125,7 @@ impl CallbackWrappedRunnerHTTP {
             context: cb.context,
             cb: cb.callback.clone_ref(py),
             scope: scope.into_py(py),
+            pytaskref: Arc::new(Mutex::new(None)),
         }
     }
 
@@ -137,10 +140,12 @@ impl CallbackWrappedRunnerHTTP {
 
     fn done(&self) {
         callback_impl_done_http!(self);
+        self.pytaskref.lock().unwrap().take();
     }
 
     fn err(&self, err: Bound<PyAny>) {
         callback_impl_done_err!(self, &PyErr::from_value_bound(err));
+        self.pytaskref.lock().unwrap().take();
     }
 }
 
@@ -233,6 +238,7 @@ pub(crate) struct CallbackWrappedRunnerWebsocket {
     cb: PyObject,
     #[pyo3(get)]
     scope: PyObject,
+    pytaskref: Arc<Mutex<Option<PyObject>>>,
 }
 
 impl CallbackWrappedRunnerWebsocket {
@@ -242,6 +248,7 @@ impl CallbackWrappedRunnerWebsocket {
             context: cb.context,
             cb: cb.callback.clone_ref(py),
             scope: scope.into_py(py),
+            pytaskref: Arc::new(Mutex::new(None)),
         }
     }
 
@@ -256,10 +263,12 @@ impl CallbackWrappedRunnerWebsocket {
 
     fn done(&self) {
         callback_impl_done_ws!(self);
+        self.pytaskref.lock().unwrap().take();
     }
 
     fn err(&self, err: Bound<PyAny>) {
         callback_impl_done_err!(self, &PyErr::from_value_bound(err));
+        self.pytaskref.lock().unwrap().take();
     }
 }