derrickaw commented on code in PR #38236:
URL: https://github.com/apache/beam/pull/38236#discussion_r3119639022
##########
sdks/python/apache_beam/yaml/yaml_mapping.py:
##########
@@ -205,83 +211,78 @@ def py_value_to_js_dict(py_value):
return py_value
+def js_to_py(obj):
+ """Converts mini-racer mapped objects to standard Python types.
+
+ This is needed because ctx.eval returns objects that implement Mapping
+ and Iterable but are not picklable (like JSMappedObjectImpl and JSArrayImpl),
+ which would fail when Beam tries to serialize rows containing them.
+ We also preserve datetime objects which are correctly produced by ctx.eval
+ for JS Date objects.
+ """
+ if isinstance(obj, datetime.datetime):
+ return obj
+ elif isinstance(obj, Mapping):
+ return {k: js_to_py(v) for k, v in obj.items()}
+ elif not isinstance(obj, (str, bytes)) and isinstance(obj, Iterable):
+ return [js_to_py(v) for v in obj]
+ elif isinstance(obj, str):
+ try:
+ if obj.endswith('Z'):
+ return datetime.datetime.fromisoformat(obj[:-1] + '+00:00')
+ return datetime.datetime.fromisoformat(obj)
+ except ValueError:
+ return obj
Review Comment:
done
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