bpo-47039: Normalize repr() of asyncio future and task objects (GH-31950)

Lib/asyncio/base_futures.py

@@ -42,16 +42,6 @@ def _format_callbacks(cb):
     return f'cb=[{cb}]'
 
 
-# bpo-42183: _repr_running is needed for repr protection
-# when a Future or Task result contains itself directly or indirectly.
-# The logic is borrowed from @reprlib.recursive_repr decorator.
-# Unfortunately, the direct decorator usage is impossible because of
-# AttributeError: '_asyncio.Task' object has no attribute '__module__' error.
-#
-# After fixing this thing we can return to the decorator based approach.
-_repr_running = set()
-
-
 def _future_repr_info(future):
     # (Future) -> str
     """helper function for Future.__repr__"""
@@ -60,17 +50,9 @@ def _future_repr_info(future):
         if future._exception is not None:
             info.append(f'exception={future._exception!r}')
         else:
-            key = id(future), get_ident()
-            if key in _repr_running:
-                result = '...'
-            else:
-                _repr_running.add(key)
-                try:
-                    # use reprlib to limit the length of the output, especially
-                    # for very long strings
-                    result = reprlib.repr(future._result)
-                finally:
-                    _repr_running.discard(key)
+            # use reprlib to limit the length of the output, especially
+            # for very long strings
+            result = reprlib.repr(future._result)
             info.append(f'result={result}')
     if future._callbacks:
         info.append(_format_callbacks(future._callbacks))
@@ -78,3 +60,9 @@ def _future_repr_info(future):
         frame = future._source_traceback[-1]
         info.append(f'created at {frame[0]}:{frame[1]}')
     return info
+
+
+@reprlib.recursive_repr()
+def _future_repr(future):
+    info = ' '.join(_future_repr_info(future))
+    return f'<{future.__class__.__name__} {info}>'