catalog-builder 0.4

Data Catalogs Made Easy

Build a custom data-catalog in minutes

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🔍️ 1. What is CatalogBuilder?

• CatalogBuilder is a simple tool to generate & deploy a documentation website for your data assets.
• It enables anyone at your company to quickly find the trusted data they are looking for.

💡 2. Why CatalogBuilder?

There are many open-source projects (admundsen, open-metadata, datahub, metacat, atlas) to build such a catalog in-house. But as they offer a lot of advanced features, they are hard to manage and deploy if you're not a tech expert. They can be even harder to customize.

dbt docs is great to generate a documentation website on top of your dbt assets but:

• it focuses on dbt only (while you are interested in other sources + metadata)
• is very hard to customize (except you're an angular expert)
• can be slow.

👉 CatalogBuilder aims at offering a lightweight alternative to generate a documentation website on top of your data assets. It focuses on read-only data discovery and:

1. ✔️ can be easily customized and deployed by low tech people
2. ✔️ can then handle the very specific needs of your company
3. ✔️ is fast and lightweight
4. ✔️ is built on top of the very famous mkdocs-material python library which is used by millions of developers to deploy their documentation (such as fastapi).

💥 3. Getting Started with catalog CLI

catalog is the CLI (command-line-interface) of CatalogBuilder to generate, show & deploy the documentation.

3.1 Install catalog CLI 🛠️

pip install catalog-builder

3.2 Create your first documentation configuration 👨‍💻

catalog download dbt_gitlab_data_team

To get started, let's download a catalog configuration example from the GitHub repo and play with it. The above command will download the catalogs/dbt_gitlab_data_team folder on your laptop.

You will find in the folder:

• assets file: a file containing the list of the assets you want to put in your documentation. It can be a parquet file named assets.parquet or a json lines file named assets.jsonl. Each asset in the file must have the following fields:
  • asset_type: for example: table.
  • documentation_path: the path of the asset page in the generated documentation. For example dataset_name/table_name.
  • data: a dict of attributes used to generate the documentation. For example {"name": "foo"}
• generate_assets_file.py: the python script used to (re)generate the assets file.
• requirements.txt: the python requirements needed by generate_assets_file.py.
• templates: a folder which includes a jinja-template markdown-file for each asset_type. These templates are used to generate a markdown documentation file for each asset.
• source_docs: a folder which includes files to include as-is in the documentation.
• mkdocs.yml: the mkdocs configuration file used by mkdocs to build the documentation website from the generated markdown files.

3.3 Build your catalog website 👾

catalog build dbt_gitlab_data_team

1. For each asset of the assets file, the jinja template of asset_type will be rendered using the asset data to generate a markdown file which will be written into catalogs/dbt_gitlab_data_team/docs/ at documentation_path.
2. All files in catalogs/dbt_gitlab_data_team/source_docs/ are copied into catalogs/dbt_gitlab_data_team/docs/
3. Mkdocs will then build the documentation website from the markdown files into catalogs/dbt_gitlab_data_team/site (using mkdocs.yml configuration file).

3.4 Run your catalog website locally ⚡

catalog serve dbt_gitlab_data_team

You can now see the generated documentation website at http://localhost:8000.

3.5 Deploy the documentation website! 🚀

A. To deploy on GitHub pages:

catalog deploy github-pages dbt_gitlab_data_team

Mkdocs will deploy the site on GitHub pages (this only works if you are on a github repository).

B. To deploy on Google Cloud Storage Bucket:

catalog deploy gcs dbt_gitlab_data_team

Mkdocs will copy all the files in catalogs/dbt_gitlab_data_team/site to the bucket defined by site_url value of catalogs/dbt_gitlab_data_team/mkdocs.yml. For instance if the site url is http://catalogs.unytics.io/dbt_gitlab_data_team/ it will copy all files under catalogs/dbt_gitlab_data_team/site to gs://catalogs.unytics.io/dbt_gitlab_data_team/

C. To deploy elsewhere:

You can follow these instructions from mkdocs.

💎 4. Generate your dbt documentation

To generate a documentation website for your own dbt project, do the following:

1. Change directory to your dbt project directory
2. Download catalogs/dbt documentation example by running catalog download dbt.
3. Run dbt docs generate to compute target/manifest.json and target/catalog.json.
4. Generate the assets file by running python catalogs/dbt/generate_assets_file.py. The script will parse target/manifest.json and target/catalog.json to generate the assets file in the expected format.
5. Run catalog serve dbt to build the website and show it locally.

Keep in touch 🧑‍💻

Join our Slack for any question, to get help for getting started, to speak about a bug, to suggest improvements, or simply if you want to have a chat 🙂.

👋 Contribute

Any contribution is more than welcome 🤗!

• Add a ⭐ on the repo to show your support
• Join our Slack and talk with us
• Raise an issue to raise a bug or suggest improvements
• Open a PR!

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