This plugin manages how data are stored in DCOR. There are two types of files in DCOR:

1. Resources uploaded by users, imported from figshare, or imported from a data archive
2. Ancillary files that are generated upon resource creation, such as condensed DC data, preview images (see ckanext-dc_view).

This plugin implements:

• A background job that uploads resources to S3 in after_resource_create if the resources were previously uploaded via the legacy upload route. This functionality is interesting for legacy setups that are not using S3 object storage by default.

• Import datasets from figshare. Existing datasets on figshare are parsed, datasets are created and resources uploaded to S3 object storage. When running the following command, the "figshare-import" organization is created and the datasets listed in figshare_dois.txt are added to CKAN:

  ckan dcor-import-figshare --limit 2
  

• CLI for running all background jobs (migration to S3):

  ckan run-jobs-dcor-depot
  

• CLI for appending a resource to a dataset

  ckan append-resource /path/to/file dataset_id --delete-source
  

• CLI for migrating data from block storage to an S3-compatible object storage service. For this, the following configuration keys must be specified in the ckan.ini file:

  dcor_object_store.access_key_id = ACCESS_KEY_ID
  dcor_object_store.secret_access_key = SECRET_ACCESS_KEY
  dcor_object_store.endpoint_url = S3_ENDPOINT_URL
  dcor_object_store.ssl_verify = true
  # The bucket name is by default defined by the circle ID. Resources
  # are stored in the "RES/OUR/CEID-SCHEME" in that bucket.
  dcor_object_store.bucket_name = circle-{organization_id}
  

  Usage:

  ckan dcor-migrate-resources-to-object-store --modified-days 2 --delete-after-migration --verify-checksum
  

• CLI for listing all S3 objects for a dataset:

  ckan dcor-list-s3-objects-for-dataset c7a98a04-4e0a-98a7-fb0b-eca379d1f219
  

• CLI for listing all resources:

  ckan list-all-resources
  

• CLI for pruning stale multipart uploads:

  ckan dcor-prune-stale-multipart-uploads --initiated-before-days 5 --dry-run
  

pip install ckanext-dcor_depot

Add this extension to the plugins and default_views in ckan.ini:

ckan.plugins = [...] dcor_depot
ckan.storage_path=/data/ckan-HOSTNAME
ckanext.dcor_depot.users_depot_name=users-HOSTNAME

This plugin stores resources to /data:

mkdir -p /data/depots/users-$(hostname)
chown -R www-data /data/depots/users-$(hostname)

If CKAN/DCOR is installed and setup for testing, this extension can be tested with pytest:

pytest ckanext

Testing is implemented via GitHub Actions. You may also set up a local docker container with CKAN and MinIO. Take a look at the GitHub Actions workflow for more information.