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app.py

@@ -57,15 +57,6 @@ def _build_yaml(protein_seq: str, ligand_smiles: str) -> str:
     return pyyaml.safe_dump(doc, sort_keys=False)
 
 
-class _SerialFuture:
-    def __init__(self, fn, args, kwargs):
-        self._fn, self._args, self._kwargs = fn, args, kwargs
-        self._done = False
-
-    def result(self, timeout=None):
-        return self._fn(*self._args, **self._kwargs)
-
-
 class _SerialExecutor:
     """Drop-in for ProcessPoolExecutor that runs tasks inline in the current
     process. Required on ZeroGPU: the @spaces.GPU worker is a daemonic fork and
@@ -85,7 +76,14 @@ class _SerialExecutor:
         return False
 
     def submit(self, fn, *args, **kwargs):
-        return _SerialFuture(fn, args, kwargs)
+        from concurrent.futures import Future
+
+        fut = Future()
+        try:
+            fut.set_result(fn(*args, **kwargs))
+        except BaseException as exc:  # noqa: BLE001
+            fut.set_exception(exc)
+        return fut
 
 
 def _patch_nesso_multiprocessing():