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fix(extension_registry): load default extensions via iterdir() - #285
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📝 Summary
Merge Risk: ⚪ Minimal · up to Default extension loading now works when bundled resources are exposed as multiplexed or ZIP-backed paths. It also fails with a clear error if no extension files are found. The earlier concerns about ZIP resources and Python 3.10 test collection appear to be fixed, so no merge-blocking risk remains. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 4 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Linked Issues check Issue #284requires default extension loading whenfiles()returns aMultiplexedPath.ExtensionRegistry.__init__now usesiterdir()and filters names forfunctions*.yaml. `register_extension…Out of Scope Changes check The changes stay within issue #284. The production changes replace non-portable resource enumeration and support the returnedTraversablevalues. The tests cover the affected resource forms. The fix…Title check The title is a valid Conventional Commit and clearly describes the primary change: using iterdir() to load default extensions. Description check The description explains the bug, affected resource types, implementation, regression tests, failure behavior, encoding impact, and linked issue. It provides the required rationale and is sufficiently…
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Actionable comments posted: 2
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Inline comments:
Review comments at @src/substrait/extension_registry/registry.py:
- Line 48: Update the call to register_extension_yaml in the extension-loading
flow so ZIP-backed resources remain usable as Traversable objects instead of
being converted with Path(fname). Use importlib.resources.as_file around the
call or update register_extension_yaml to read via Traversable.open(), while
preserving support for ordinary filesystem paths.
Review comments at @tests/extension_registry/test_multiplexed_path.py:
- Line 14: Update the MultiplexedPath import in the test module to support
Python 3.10, where importlib.resources.readers is unavailable; use a compatible
fallback import while preserving the existing import on newer Python versions.
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src/substrait/extension_registry/registry.pytests/extension_registry/test_multiplexed_path.py
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27f92d3 address coderabbit's comments. |
nielspardon
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nielspardon
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The iterdir() change is the right fix for #284, thanks; the inline comment on as_file is the main one, the rest are smaller. Two things outside the diff: please replace the remaining files(...).glob in the arithmetic_only_registry fixture (tests/extension_registry/test_collector.py:68-76) with registry.register_extension_yaml(importlib_resources.files("substrait_extensions.extensions") / "functions_arithmetic.yaml"), which works once register_extension_yaml accepts a Traversable, and update the PR title and body, which become the squash commit, to cover the zip change and drop "and passes after". Also, how does your WASI setup end up with extensions/ as a namespace package? The published wheel ships extensions/__init__.py, so if something in the staging drops it, that's worth saying in the description.
`ExtensionRegistry.__init__` loaded the bundled extension YAMLs with
`files("substrait_extensions.extensions").glob("functions*.yaml")`.
`importlib.resources.files()` returns a `Traversable`, which is not guaranteed
to be a filesystem `Path`, and `glob` is not part of the `Traversable`
protocol. It happens to work only when the resource resolves to a `Path`:
- When `substrait_extensions.extensions` resolves as a *namespace* package (no
`extensions/__init__.py`), the resource reader returns a `MultiplexedPath`,
which implements `iterdir`/`open`/`joinpath` but not `glob`. Constructing a
registry then raised `AttributeError: 'MultiplexedPath' object has no
attribute 'glob'`, aborting any `ExtensionRegistry(load_default_extensions=True)`.
- For a zip-imported install the resource is a `zipfile.Path`, which also lacks
`glob` before Python 3.12 and is not `os.PathLike`, so it could not be loaded
at all.
A regular on-disk package resolves to a `Path` (which has `.glob`), so the bug
stays hidden until the package data is laid out without the sub-package's
`__init__.py` -- e.g. by a packaging or staging step -- and only then surfaces.
Discover the YAMLs with `iterdir()` filtered by name instead; `iterdir()` is
part of the `Traversable` protocol and behaves the same across `Path`,
`MultiplexedPath`, and zip-based readers. `register_extension_yaml` now opens the
`Traversable` directly in binary mode rather than routing through `Path(fname)`,
so zip-backed resources load without being copied to a temporary file, and
PyYAML detects the file's encoding instead of trusting the process locale's (the
bundled YAMLs contain non-ASCII characters, which otherwise crashed on non-UTF-8
locales such as Japanese Windows). A broken install that exposes no matching
YAMLs now raises `RuntimeError` instead of silently building an empty registry
that only surfaces later as "no matching overload" errors.
Add regression tests that resolve `files()` to a `MultiplexedPath` and to a
`zipfile.Path` and assert every bundled `functions*.yaml` is loaded.
Fixes substrait-io#284
27f92d3 to
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Updated the PR — the published wheel does ship extensions/init.py, but in another setup of mine the staged tree dropped it (it's a 0-byte marker), so extensions/ resolved as a namespace package and triggered this. The change makes the loading robust to that. |
bvolpato
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bvolpato
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LGTM, thanks for the follow-up. The loader uses the Traversable API throughout, including ZIP resources. I confirmed the regression tests fail against the old loader and pass on Python 3.10 and 3.12; the full default suite also passes on 3.10.
ExtensionRegistry.__init__loaded the bundled extension YAMLs withfiles("substrait_extensions.extensions").glob("functions*.yaml").importlib.resources.files()returns aTraversable, which may not be afilesystem
Path. Also,globis not part of theTraversableprotocol. It only works when the resource resolves to a
Path:substrait_extensions.extensionsresolves as a namespace package (noextensions/__init__.py), the resource reader returns aMultiplexedPath,which implements
iterdir/open/joinpathbut notglob. Constructing aregistry then raises
AttributeError: 'MultiplexedPath' object has no attribute 'glob', aborting anyExtensionRegistry(load_default_extensions=True).zipfile.Path, which also lacksglobbefore Python 3.12 and is notos.PathLike, so it could not be loadedat all.
A regular on-disk package resolves to a
Path(which has.glob), so the bugstays hidden until the package data is laid out without the sub-package's
__init__.py-- e.g. by a packaging or staging step -- and only then surfaces.Discover the YAMLs with
iterdir()filtered by name instead;iterdir()ispart of the
Traversableprotocol and behaves the same acrossPath,MultiplexedPath, and zip-based readers.register_extension_yamlnow opens theTraversabledirectly in binary mode rather than routing throughPath(fname),so zip-backed resources load without being copied to a temporary file, and
PyYAML detects the file's encoding instead of trusting the process locale's (the
bundled YAMLs contain non-ASCII characters, which otherwise crashed on non-UTF-8
locales such as Japanese Windows). A broken install that exposes no matching
YAMLs now raises
RuntimeErrorinstead of silently building an empty registrythat only surfaces later as "no matching overload" errors.
Add regression tests that resolve
files()to aMultiplexedPathand to azipfile.Pathand assert every bundledfunctions*.yamlis loaded.Fixes #284