derrickaw commented on code in PR #38236:
URL: https://github.com/apache/beam/pull/38236#discussion_r3169885042
##########
sdks/python/apache_beam/yaml/yaml_mapping.py:
##########
@@ -205,85 +193,137 @@ def py_value_to_js_dict(py_value):
return py_value
-# TODO(yaml) Consider adding optional language version parameter to support
-# ECMAScript 5 and 6
-def _expand_javascript_mapping_func(
- original_fields, expression=None, callable=None, path=None, name=None):
+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):
+ if _JS_DATE_ISO_REGEX.match(obj):
+ try:
+ return datetime.datetime.fromisoformat(obj[:-1] + '+00:00')
+ except ValueError:
+ return obj
+ return obj
+ else:
+ return obj
- # Check for installed js2py package
- if js2py is None:
- raise ValueError(
- "Javascript mapping functions are not supported on"
- " Python 3.12 or later.")
-
- # import remaining js2py objects
- from js2py import base
- from js2py.constructors import jsdate
- from js2py.internals import simplex
-
- js_array_type = (
- base.PyJsArray,
- base.PyJsArrayBuffer,
- base.PyJsInt8Array,
- base.PyJsUint8Array,
- base.PyJsUint8ClampedArray,
- base.PyJsInt16Array,
- base.PyJsUint16Array,
- base.PyJsInt32Array,
- base.PyJsUint32Array,
- base.PyJsFloat32Array,
- base.PyJsFloat64Array)
-
- def _js_object_to_py_object(obj):
- if isinstance(obj, (base.PyJsNumber, base.PyJsString, base.PyJsBoolean)):
- return base.to_python(obj)
- elif isinstance(obj, js_array_type):
- return [_js_object_to_py_object(value) for value in obj.to_list()]
- elif isinstance(obj, jsdate.PyJsDate):
- return obj.to_utc_dt()
- elif isinstance(obj, (base.PyJsNull, base.PyJsUndefined)):
- return None
- elif isinstance(obj, base.PyJsError):
- raise RuntimeError(obj['message'])
- elif isinstance(obj, base.PyJsObject):
- return {
- key: _js_object_to_py_object(value['value'])
- for (key, value) in obj.own.items()
- }
- elif isinstance(obj, base.JsObjectWrapper):
- return _js_object_to_py_object(obj._obj)
- return obj
+class JsFilterDoFn(beam.DoFn):
+ def __init__(self, udf_code, function_name):
+ self.udf_code = udf_code
+ self.function_name = function_name
+ self.ctx = None
+
+ def setup(self):
+ self.ctx = MiniRacer()
+ self.ctx.eval(self.udf_code)
+
+ def process(self, element):
+ row_as_dict = py_value_to_js_dict(element)
+ result = self.ctx.call(self.function_name, row_as_dict)
+ result = js_to_py(result)
+ if result:
+ yield element
+
+
+class JsMapToFieldsDoFn(beam.DoFn):
+ def __init__(self, fields, original_fields, input_schema):
+ self.ctx = None
+ self.field_funcs = {}
+ self.passthrough_fields = []
+
+ script = []
+ for name, expr in fields.items():
+ if isinstance(expr, str) and expr in input_schema:
+ self.passthrough_fields.append((name, expr))
+ continue
+
+ if isinstance(expr, str):
+ expr = {'expression': expr}
+
+ if 'expression' in expr:
+ e = expr['expression']
+ code = f"var func_{name} = (__row__) => {{ " + " ".join(
+ [f"const {n} = __row__.{n};"
+ for n in original_fields if n in e]) + f" return ({e}); }}"
+ script.append(code)
+ self.field_funcs[name] = f"func_{name}"
+ elif 'callable' in expr:
+ code = f"var func_{name} = {expr['callable']}"
+ script.append(code)
+ self.field_funcs[name] = f"func_{name}"
+ elif 'path' in expr and 'name' in expr:
+ path = expr['path']
+ func_name = expr['name']
+ udf_code = FileSystems.open(path).read().decode()
Review Comment:
It is already.
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