Ricardo Garcia Silva
f7b0a584e1
* Removed datamodel-code-generator from dev requirements * Adapted docs to mention datamodel-code-generator not being a direct dependency
109 lines
3.7 KiB
ReStructuredText
109 lines
3.7 KiB
ReStructuredText
.. _developmenrt:
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Development
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===========
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Codebase
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--------
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The pygeoapi codebase exists at https://github.com/geopython/pygeoapi.
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Testing
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-------
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pygeoapi uses `pytest <https://docs.pytest.org>`_ for managing its automated tests. Tests
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exist in ``/tests`` and are developed for providers, formatters, processes, as well as the
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overall API.
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Tests can be run locally as part of development workflow. They are also run on pygeoapi’s
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`GitHub Actions setup`_ against all commits and pull requests to the code repository.
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To run all tests, simply run ``pytest`` in the repository. To run a specific test file,
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run ``pytest tests/test_api.py``, for example.
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CQL extension lifecycle
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-----------------------
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Limitations
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^^^^^^^^^^^
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This workflow is valid only for the `CQL-JSON` format.
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Schema
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^^^^^^
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The Common Query Language (CQL) is the part 3 of the standard OGC API - Features. This extension has its specification available at
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`OGC API - Features - Part 3: Filtering and the Common Query Language (CQL) <https://portal.ogc.org/files/96288>`_ and the schema exists in development at
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`cql.json <https://portal.ogc.org/files/96288#cql-json-schema>`_.
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Model generation
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^^^^^^^^^^^^^^^^
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pygeoapi uses a class-based Python model interface to translate the schema into Python objects defined by `pydantic <https://docs.pydantic.dev/>`_ models.
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The model is generated with the pre-processing of the schema through the utility ``datamodel-codegen``, which is part
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of the `datamodel-code-generator <https://koxudaxi.github.io/datamodel-code-generator/>`_ package:
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.. code-block:: bash
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# Generate from local downloaded json schema file
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datamodel-codegen --input ~/Download/cql-schema.json --input-file-type jsonschema --output ./pygeoapi/models/cql_update.py --class-name CQLModel
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Note that datamodel-code-generator must be explicitly installed, as it is not a pygeoapi runtime dependency
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How to merge
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^^^^^^^^^^^^
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Once the new pydantic models have been generated then the content of the Python file ``cql_update.py`` can be used to replace the old classes within the ``cql.py`` file.
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Update everything above the function ``get_next_node`` and then verify if the tests for the CQL are still passing, for example ``test_post_cql_json_between_query``
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in ``tests/test_elasticsearch__provider.py``.
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Working with Spatialite on OSX
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------------------------------
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Using pyenv
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^^^^^^^^^^^
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It is common among OSX developers to use the package manager homebrew for the installation of pyenv to being able to manage multiple versions of Python.
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They can encounter errors about the load of some SQLite extensions that pygeoapi uses for handling spatial data formats. In order to run properly the server
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you are required to follow these steps below carefully.
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Make Homebrew and pyenv play nicely together:
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.. code-block:: bash
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# see https://github.com/pyenv/pyenv/issues/106
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alias brew='env PATH=${PATH//$(pyenv root)\/shims:/} brew'
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Install Python with the option to enable SQLite extensions:
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.. code-block:: bash
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LDFLAGS="-L/usr/local/opt/sqlite/lib -L/usr/local/opt/zlib/lib" CPPFLAGS="-I/usr/local/opt/sqlite/include -I/usr/local/opt/zlib/include" PYTHON_CONFIGURE_OPTS="--enable-loadable-sqlite-extensions" pyenv install 3.7.6
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Configure SQLite from Homebrew over that one shipped with the OS:
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.. code-block:: bash
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export PATH="/usr/local/opt/sqlite/bin:$PATH"
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Install Spatialite from Homebrew:
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.. code-block:: bash
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brew update
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brew install spatialite-tools
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brew libspatialite
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Set the variable for the Spatialite library under OSX:
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.. code-block:: bash
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SPATIALITE_LIBRARY_PATH=/usr/local/lib/mod_spatialite.dylib
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.. _`GitHub Actions setup`: https://github.com/geopython/pygeoapi/blob/master/.github/workflows/main.yml
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