Issue #25304: Add asyncio.run_coroutine_threadsafe(). By Vincent Michel.

Lib/test/test_asyncio/test_futures.py

@@ -174,8 +174,6 @@ class FutureTests(test_utils.TestCase):
                          '<Future cancelled>')
 
     def test_copy_state(self):
-        # Test the internal _copy_state method since it's being directly
-        # invoked in other modules.
         f = asyncio.Future(loop=self.loop)
         f.set_result(10)
 

Lib/test/test_asyncio/test_tasks.py

@@ -2100,5 +2100,72 @@ class CoroutineGatherTests(GatherTestsBase, test_utils.TestCase):
         self.assertIsInstance(f.exception(), RuntimeError)
 
 
+class RunCoroutineThreadsafeTests(test_utils.TestCase):
+    """Test case for futures.submit_to_loop."""
+
+    def setUp(self):
+        self.loop = self.new_test_loop(self.time_gen)
+
+    def time_gen(self):
+        """Handle the timer."""
+        yield 0  # second
+        yield 1  # second
+
+    @asyncio.coroutine
+    def add(self, a, b, fail=False, cancel=False):
+        """Wait 1 second and return a + b."""
+        yield from asyncio.sleep(1, loop=self.loop)
+        if fail:
+            raise RuntimeError("Fail!")
+        if cancel:
+            asyncio.tasks.Task.current_task(self.loop).cancel()
+            yield
+        return a + b
+
+    def target(self, fail=False, cancel=False, timeout=None):
+        """Run add coroutine in the event loop."""
+        coro = self.add(1, 2, fail=fail, cancel=cancel)
+        future = asyncio.run_coroutine_threadsafe(coro, self.loop)
+        try:
+            return future.result(timeout)
+        finally:
+            future.done() or future.cancel()
+
+    def test_run_coroutine_threadsafe(self):
+        """Test coroutine submission from a thread to an event loop."""
+        future = self.loop.run_in_executor(None, self.target)
+        result = self.loop.run_until_complete(future)
+        self.assertEqual(result, 3)
+
+    def test_run_coroutine_threadsafe_with_exception(self):
+        """Test coroutine submission from a thread to an event loop
+        when an exception is raised."""
+        future = self.loop.run_in_executor(None, self.target, True)
+        with self.assertRaises(RuntimeError) as exc_context:
+            self.loop.run_until_complete(future)
+        self.assertIn("Fail!", exc_context.exception.args)
+
+    def test_run_coroutine_threadsafe_with_timeout(self):
+        """Test coroutine submission from a thread to an event loop
+        when a timeout is raised."""
+        callback = lambda: self.target(timeout=0)
+        future = self.loop.run_in_executor(None, callback)
+        with self.assertRaises(asyncio.TimeoutError):
+            self.loop.run_until_complete(future)
+        # Clear the time generator and tasks
+        test_utils.run_briefly(self.loop)
+        # Check that there's no pending task (add has been cancelled)
+        for task in asyncio.Task.all_tasks(self.loop):
+            self.assertTrue(task.done())
+
+    def test_run_coroutine_threadsafe_task_cancelled(self):
+        """Test coroutine submission from a tread to an event loop
+        when the task is cancelled."""
+        callback = lambda: self.target(cancel=True)
+        future = self.loop.run_in_executor(None, callback)
+        with self.assertRaises(asyncio.CancelledError):
+            self.loop.run_until_complete(future)
+
+
 if __name__ == '__main__':
     unittest.main()