Differential D8542 Diff 30805 swh/lister/cpan/__init__.py

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swh/lister/cpan/init.py

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				# Copyright (C) 2022 The Software Heritage developers
				# See the AUTHORS file at the top-level directory of this distribution
				# License: GNU General Public License version 3, or any later version
				# See top-level LICENSE file for more information


				"""
				Cpan lister
				=============

				The Cpan lister list origins from `cpan.org`_, the Comprehensive Perl Archive
				Network. It provides search features via `metacpan.org`_.

				As of September 2022 `cpan.org`_ list 43675 package names.

				Origins retrieving strategy
				---------------------------

				To get a list of all package names we call a first `http api endpoint`_ that
				retrieve results and a ``_scroll_id`` that will be used to scroll pages through
				`search`_ endpoint.

				Page listing
				------------

				Each page returns a list of ``results`` which are raw data from api response.

				Origins from page
				-----------------

				Origin url is the html page corresponding to a package name on `metacpan.org`_, following
				this pattern::

				"https://metacpan.org/dist/{pkgname}"

				Running tests
				-------------

				Activate the virtualenv and run from within swh-lister directory::

				pytest -s -vv --log-cli-level=DEBUG swh/lister/cpan/tests

				Testing with Docker
				-------------------

				Change directory to swh/docker then launch the docker environment::

				docker compose up -d

				Then schedule a Cpan listing task::

				docker compose exec swh-scheduler swh scheduler task add -p oneshot list-cpan

				You can follow lister execution by displaying logs of swh-lister service::

				docker compose logs -f swh-lister

				.. _cpan.org: https://cpan.org/
				.. _metacpan.org: https://metacpan.org/
				.. _http api endpoint: https://explorer.metacpan.org/?url=/distribution/
				.. _search: https://github.com/metacpan/metacpan-api/blob/master/docs/API-docs.md#search-without-constraints # noqa: B950


				"""


				def register():
				from .lister import CpanLister

				return {
				"lister": CpanLister,
				"task_modules": ["%s.tasks" % __name__],
				}