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Merge pull request #29 from lsst-dm/tickets/DM-48282
DM-48282: Use daf_butler subclass for SIAv2Handler with entry point
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,3 +1,11 @@ | ||
| # dax_obscore | ||
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| Tools to generate ObsCore data for LSST processed images using Butler Gen 3. | ||
| [](https://pypi.org/project/lsst-dax-obscore/) | ||
| [](https://codecov.io/gh/lsst-dm/dax_obscore) | ||
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| Tools to generate [IVOA ObsCore](https://www.ivoa.net/documents/ObsCore/) data and process [IVOA SIAv2](https://www.ivoa.net/documents/SIA/) queries for data stored in a Butler repository. | ||
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| * [Rubin Observatory Data Butler](https://github.com/lsst/daf_butler) | ||
| * [Overview of SIAv2 implementation](https://doi.org/10.48550/arXiv.2501.00544) | ||
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| PyPI: [lsst-dax-obscore](https://pypi.org/project/lsst-dax-obscore/) |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,73 @@ | ||
| # This file is part of dax_obscore. | ||
| # | ||
| # Developed for the LSST Data Management System. | ||
| # This product includes software developed by the LSST Project | ||
| # (http://www.lsst.org). | ||
| # See the COPYRIGHT file at the top-level directory of this distribution | ||
| # for details of code ownership. | ||
| # | ||
| # This program is free software: you can redistribute it and/or modify | ||
| # it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # This program is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
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| from __future__ import annotations | ||
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| __all__ = ["get_siav2_handler"] | ||
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| from importlib.metadata import EntryPoint, entry_points | ||
| from typing import TYPE_CHECKING | ||
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| from lsst.utils.introspection import get_full_type_name | ||
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| if TYPE_CHECKING: | ||
| from .siav2 import SIAv2Handler | ||
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| def _get_siav2_entry_points() -> dict[str, EntryPoint]: | ||
| plugins = entry_points(group="dax_obscore.siav2") | ||
| return {p.name: p for p in plugins} | ||
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| def get_siav2_handler(namespace: str) -> type[SIAv2Handler]: | ||
| """Select the correct handler for this universe namespace. | ||
| Parameters | ||
| ---------- | ||
| namespace : `str` | ||
| The butler dimension universe namespace. | ||
| Returns | ||
| ------- | ||
| handler : `type` [ `lsst.dax.obscore.siav2.SIAv2Handler` ] | ||
| The class of handler suitable for this namespace. | ||
| """ | ||
| plugins = _get_siav2_entry_points() | ||
| entry_point = plugins.get(namespace) | ||
| if entry_point is None: | ||
| known = ", ".join(plugins.keys()) | ||
| raise RuntimeError( | ||
| f"Unable to find suitable SIAv2 Handler for namespace {namespace} [do understand: {known}]" | ||
| ) | ||
| func = entry_point.load() | ||
| handler_type = func() | ||
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| # Check that we have the right type. This has to be a deferred load but | ||
| # the code should already be loaded at this point. | ||
| from .siav2 import SIAv2Handler | ||
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| if not issubclass(handler_type, SIAv2Handler): | ||
| raise TypeError( | ||
| f"Entry point for universe {namespace} did not return SIAv2Handler. " | ||
| f"Returned {get_full_type_name(handler_type)}" | ||
| ) | ||
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| return func() |
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