derrickaw commented on code in PR #38130:
URL: https://github.com/apache/beam/pull/38130#discussion_r3093344888
##########
sdks/python/apache_beam/yaml/yaml_mapping.py:
##########
@@ -17,6 +17,7 @@
"""This module defines the basic MapToFields operation."""
import itertools
+import json
Review Comment:
done
##########
sdks/python/apache_beam/yaml/yaml_mapping.py:
##########
@@ -210,78 +225,109 @@ def py_value_to_js_dict(py_value):
def _expand_javascript_mapping_func(
original_fields, expression=None, callable=None, path=None, name=None):
- # Check for installed js2py package
- if js2py is None:
+ # Check for installed quickjs package
+ if quickjs 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
+ "Javascript mapping functions require the 'quickjs' package.")
+
+ def make_bridge_source(func_name, call_expr):
+ # The bridge function facilitates high-performance data transfer from
Python
+ # to QuickJS by reconstructing the row object in JS.
+ # To minimize JSON overhead, primitives are passed directly, while complex
+ # types (lists/dicts) are passed as JSON strings and parsed in JS.
+ # The 'flags' argument indicates which values need parsing.
+ keys_json = json.dumps(list(original_fields))
+ return (
+ f"function {func_name}(serialized_flags, ...values) {{ "
+ f" const keys = {keys_json}; "
+ f" const flags = serialized_flags.split(','); "
+ f" const row = {{}}; "
+ f" for (let i = 0; i < keys.length; i++) {{ "
+ f" let val = values[i]; "
+ f" if (flags[i] === '1') val = JSON.parse(val); "
+ f" row[keys[i]] = val; "
+ f" }} "
+ f" const result = {call_expr}; "
+ f" if (result instanceof Date) "
+ f"return {{__type__: 'date', value: result.toISOString()}}; "
+ f" return result; "
+ f"}}")
if expression:
- source = '\n'.join(['function(__row__) {'] + [
- f' {name} = __row__.{name}'
- for name in original_fields if name in expression
- ] + [' return (' + expression + ')'] + ['}'])
- js_func = _CustomJsObjectWrapper(js2py.eval_js(source))
+ args = [
+ name for name in original_fields
+ if name.isidentifier() and name in expression
+ ]
+ parses = []
+ for i, arg in enumerate(args):
+ parses.append(f" if (flags[{i}] === '1') {arg} = JSON.parse({arg});")
+
+ source = f"""
+function fn(serialized_flags, {", ".join(args)}) {{
+ const flags = serialized_flags.split(',');
+{chr(10).join(parses)}
+ const result = ({expression});
+ if (result instanceof Date) return {{__type__: 'date', value:
result.toISOString()}};
+ return result;
+}}
+"""
+ js_func = _QuickJsCallable(source, "fn")
+ used_fields = args
elif callable:
- js_func = _CustomJsObjectWrapper(js2py.eval_js(callable))
+ source = make_bridge_source("fn", f"({callable})(row)")
+ js_func = _QuickJsCallable(source, "fn")
+ used_fields = None
else:
if not path.endswith('.js'):
raise ValueError(f'File "{path}" is not a valid .js file.')
udf_code = FileSystems.open(path).read().decode()
- js = js2py.EvalJs()
- js.eval(udf_code)
- js_func = _CustomJsObjectWrapper(getattr(js, name))
+ bridge_source = udf_code + "\n" + make_bridge_source(
+ "bridge_fn", f"{name}(row)")
+ js_func = _QuickJsCallable(bridge_source, "bridge_fn")
+ used_fields = None
+
+ def _prepare_args(vals):
+ js_vals = []
+ flags = []
+ for val in vals:
+ if isinstance(val, (list, dict)):
+ js_vals.append(json.dumps(val))
+ flags.append('1')
+ else:
+ js_vals.append(val)
+ flags.append('0')
+ return ",".join(flags), js_vals
def js_wrapper(row):
- row_as_dict = py_value_to_js_dict(row)
+ # Prepare arguments for the JS function. We optimize performance by
+ # passing primitives directly and only serializing complex types (lists,
+ # dicts) to JSON strings. A string of flags ('0' or '1') is passed to
+ # inform the JS bridge which arguments need to be JSON.parsed.
+ if expression:
+ vals = [py_value_to_js_dict(getattr(row, name)) for name in used_fields]
+ else:
+ row_as_dict = py_value_to_js_dict(row)
+ vals = [row_as_dict.get(name) for name in original_fields]
+
+ flags_str, js_vals = _prepare_args(vals)
+
try:
- js_result = js_func(row_as_dict)
- except simplex.JsException as exn:
+ js_result = js_func(flags_str, *js_vals)
+ except Exception as exn:
raise RuntimeError(
- f"Error evaluating javascript expression: "
- f"{exn.mes['message']}") from exn
- return dicts_to_rows(_js_object_to_py_object(js_result))
+ f"Error evaluating javascript expression: {exn}") from exn
+
+ if isinstance(js_result, quickjs.Object):
+ obj = json.loads(js_result.json())
+ if isinstance(obj, dict) and obj.get('__type__') == 'date':
+ import datetime
+ js_result = datetime.datetime.fromisoformat(obj['value'])
Review Comment:
done
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
