swh.lister.hackage package#


Module contents:

Hackage lister#

The Hackage lister list origins from hackage.haskell.org, the Haskell Package Repository.

The registry provide an http api from where the lister retrieve package names and build origins urls.

As of August 2022 hackage.haskell.org list 15536 package names.

Origins retrieving strategy#

To get a list of all package names we make a POST call to https://hackage.haskell.org/packages/search endpoint with some params given as json data.

Default params:

    "page": 0,
    "sortColumn": "default",
    "sortDirection": "ascending",
    "searchQuery": "(deprecated:any)",

The page size is 50. The lister will make has much http api call has needed to get all results.

For incremental mode we expand the search query with lastUpload greater than state.last_listing_date, the api will return all new or updated package names since last run.

Page listing#

The result is paginated, each page is 50 records long.

Entry data set example:

    "description": "3D model parsers",
    "downloads": 6,
    "lastUpload": "2014-11-08T03:55:23.879047Z",
    "maintainers": [{"display": "capsjac", "uri": "/user/capsjac"}],
    "name": {"display": "3dmodels", "uri": "/package/3dmodels"},
    "tags": [
        {"display": "graphics", "uri": "/packages/tag/graphics"},
        {"display": "lgpl", "uri": "/packages/tag/lgpl"},
        {"display": "library", "uri": "/packages/tag/library"},
    "votes": 1.5,

Origins from page#

The lister yields 50 origins url per page. Each ListedOrigin has a last_update date set.

Running tests#

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

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

Testing with Docker#

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

docker compose up -d

Then schedule an Hackage listing task:

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

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

docker compose logs -f swh-lister