Revert "[yaml] : switch js2py to pythonmonkey"

[derrickaw]

Reverts #37560

[gemini-code-assist]

Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request reverses a prior change, restoring js2py as the JavaScript execution engine for YAML-based UDFs within Apache Beam. The primary goal is to ensure compatibility and stability by reverting the integration of pythonmonkey and re-establishing the js2py framework, including necessary adaptations for object serialization and dependency management.

Highlights

• Reverted JavaScript Engine: The pull request reverts the JavaScript execution engine used in Apache Beam's YAML module from pythonmonkey back to js2py.
• Dependency Management: The setup.py file was updated to remove the pythonmonkey dependency and reintroduce js2py, with a version constraint and a condition for Python versions less than 3.12.
• Codebase Cleanup: Extensive pythonmonkey-related code, including a custom dispatcher and callable classes, was removed from yaml_mapping.py. Corresponding js2py imports and logic were reinstated.
• Pickling Support for js2py: A custom _CustomJsObjectWrapper class was added to yaml_mapping.py to address pickling issues with js2py.JsObjectWrapper objects.
• Test Updates: Unit tests in yaml_udf_test.py were adjusted to reflect the switch back to js2py, updating import checks and skip conditions.

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Changelog

• sdks/python/apache_beam/yaml/standard_io.yaml
  • Removed num_shards parameter from the WriteToJson transform definition.
• sdks/python/apache_beam/yaml/yaml_mapping.py
  • Removed imports related to atexit, importlib, os, queue, sys, threading, and uuid.
  • Reintroduced conditional imports for js2py and JsObjectWrapper.
  • Added _CustomJsObjectWrapper class to provide pickling support for js2py objects.
  • Removed the PythonMonkeyDispatcher and JavaScriptCallable classes.
  • Refactored _expand_javascript_mapping_func to use js2py for JavaScript evaluation and result conversion, including a new _js_object_to_py_object helper function.
  • Updated the error message for missing JavaScript support to reference js2py and Python 3.12 compatibility.
• sdks/python/apache_beam/yaml/yaml_udf_test.py
  • Removed importlib import.
  • Updated the JavaScript engine availability check from pythonmonkey to js2py.
  • Modified unittest.skipIf decorators to check for js2py installation status.
• sdks/python/setup.py
  • Replaced the pythonmonkey dependency with js2py, specifying a version range (>=0.74,<1) and a Python version constraint (python_version<"3.12").

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[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[derrickaw]

Run Prism_Python PreCommit 3.13

[derrickaw]

Run Python_Coverage PreCommit 3.10

[derrickaw]

Run Python_Examples PreCommit 3.11

[derrickaw]

Run Python_Integration PreCommit 3.13

[derrickaw]

Run Python_ML PreCommit 3.11

[tvalentyn]

Re test failure:

RuntimeError: Pipeline construction environment and pipeline runtime environment are not compatible. If you use a custom container image, check that the Python interpreter minor version and the Apache Beam version in your image match the versions used at pipeline construction time. Submission environment: beam:version:sdk_base:apache/beam_python3.13_sdk:2.73.0.dev. Runtime environment: beam:version:sdk_base:apache/beam_python3.13_sdk:2.72.0.dev.

seems like we have a might have regression, possibly in boot.go. The problem is that for the Dataflow test job (2026-02-20_14_47_19-12481031046029561904) we pass --sdk_location, but the artifact (new SDK, 2.73.0.dev), is not being installed.

[tvalentyn]

rootcause the py3.13 wheel format apache_beam-2.73.0.dev0-cp313-cp313-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl doesn't match expected format:

beam/sdks/python/container/boot.go

Line 422 in 9ff96df

wheelName := fmt.Sprintf("cp%s-cp%s-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", pyVersion, pyVersion)