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https://github.com/ilri/dspace-statistics-api.git
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Alan Orth
c027f01b48
This follows guidance from several well-known Python best practices guides. Basically, the idea is create a package for the application that is comprised of several re-usable modules. See: https://docs.python-guide.org/writing/structure/ See: https://realpython.com/python-application-layouts/
80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
# DSpace Statistics API [](https://travis-ci.org/alanorth/dspace-statistics-api)
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A simple REST API to expose Solr view and download statistics for items in a DSpace repository. This project contains a standalone indexing component and a WSGI application.
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## Requirements
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- Python 3.5+
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- PostgreSQL version 9.5+ (due to [`UPSERT` support](https://wiki.postgresql.org/wiki/UPSERT))
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- DSpace 4+ with [Solr usage statistics enabled](https://wiki.duraspace.org/display/DSDOC5x/SOLR+Statistics)
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## Installation and Testing
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Create a Python virtual environment and install the dependencies:
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$ python -m venv venv
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$ . venv/bin/activate
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$ pip install -r requirements.txt
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Set up the environment variables for Solr and PostgreSQL:
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$ export SOLR_SERVER=http://localhost:8080/solr
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$ export DATABASE_NAME=dspacestatistics
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$ export DATABASE_USER=dspacestatistics
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$ export DATABASE_PASS=dspacestatistics
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$ export DATABASE_HOST=localhost
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Index the Solr statistics core to populate the PostgreSQL database:
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$ python -m dspace_statistics_api.indexer
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Run the REST API:
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$ gunicorn dspace_statistics_api.app:api
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Test to see if there are any statistics:
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$ curl 'http://localhost:8000/items?limit=1'
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## Deployment
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There are example systemd service and timer units in the `contrib` directory. The API service listens on localhost by default so you will need to expose it publicly using a web server like nginx.
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An example nginx configuration is:
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```
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server {
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#...
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location ~ /rest/statistics/?(.*) {
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access_log /var/log/nginx/statistics.log;
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proxy_pass http://statistics_api/$1$is_args$args;
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}
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}
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upstream statistics_api {
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server 127.0.0.1:5000;
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}
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```
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This would expose the API at `/rest/statistics`.
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## Using the API
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The API exposes the following endpoints:
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- GET `/items` — return views and downloads for all items that Solr knows about¹. Accepts `limit` and `page` query parameters for pagination of results.
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- GET `/item/id` — return views and downloads for a single item (*id* must be a positive integer). Returns HTTP 404 if an item id is not found.
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¹ We are querying the Solr statistics core, which technically only knows about items that have either views or downloads.
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## Todo
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- Add API documentation
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- Close DB connection when gunicorn shuts down gracefully
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- Better logging
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- Tests
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- Check if database exists (try/except)
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- Version API
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- Use JSON in PostgreSQL
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- Switch to [Python 3.6+ f-string syntax](https://realpython.com/python-f-strings/)
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## License
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This work is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html).
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