dagtool 0.0.2

a friendly airflow dag build tool

DAG Tool

A Friendly Airflow DAG Build Tool for Data Engineer with YAML file template.

[!WARNING] This project will reference the DAG generate code from the Astronomer: DAG-Factory. But I replace some logic that fit with ETL propose for Data Engineer.

[!NOTE] Disclaimer: This project will override all necessary parameters that should pass to Airflow object with ETL context for Data Engineer use-case. So, if you want to use and enhance this project, you can fork this project anytime without notice me.

Feature Supported:

• ✅ JSON Schema Validation
• 🔐 Passing environment variable
• 💚 Allow Passing Airflow Template

From my opinion, a data Engineer should focus on the user requirement instead of focusing on the Python code when it need creates a new DAG in our Airflow application.

So, this project focus for this plain to make sure that all DAG can readable and easy to maintain with the same standard when we want to scale up and out the Airflow application support 10 to 1000 DAGs.

File Structure:

dags/
├── { domain }/
│     ├── { module-dags }/
│     │     ├── __init__.py
│     │     ├── dag.yml
│     │     ├── variables.yml
│     │     └── assets/
│     │         ├── dag-schema-mapping.json
│     │         └── dag-transform-query.sql
│     │
│     └── { module-dags }/
│           ├── __init__.py

[!NOTE] I think this project should support multiple DAGs structure like:

dags/
├── { domain }/
│     ├── { module-dags }/
│     │     ├── __init__.py
│     │     ├── dag-{ name-1 }.yml
│     │     ├── dag-{ name-2 }.yml
│     │     ├── variables.yml
│     │     └── assets/
│     │         ├── dag-case-1-schema-mapping.json
│     │         ├── dag-case-1-transform-query.sql
│     │         ├── dag-case-2-schema-mapping.json
│     │         └── dag-case-2-transform-query.sql
│     │
│     └── { module-dags }/
│           ├── __init__.py

Execution Flow:

The flow of this project provide the interface Pydantic Model before passing it to Airflow objects.

S --> Template --> Pydantic Model --> DAG/Operator Objects --> Execute --> E

CI Flow:

S --> DAGs      --> GitSync     --> Airflow K8s Pod
  --> Variables --> API Sync    --> Airflow Variables
  --> Assets    --> CI Merge

📦 Installation

[!WARNING] This package does not publish to PyPI yet.

uv pip install -U dagtool

Airflow Version	Supported	Noted
2.7.1	✅	This is the first Airflow version that this project supported.
>=2.7.1,<3.0.0	❌	Common version support for Airflow version 2.x.x
>=3.x.x	❌	Common version support for Airflow version 3.x.x

🎯 Usage

This DAG generator engine need you define the dag.yml file and set engine object to get the current path on __init__.py file.

DAG Template

[!NOTE] If you want to dynamic environment config on the dag.yaml file, you can use a variable.yaml file for dynamic value that marking on config template via macro function, {{ vars('keystore-on-dag-name') }}.

name: transaction
schedule: "@daily"
owner: "[e-mail],[e-mail]"
authors: ["de-team"]
tags: ["sales", "tier-1", "daily"]
tasks:
  - task: start
    op: empty

  - group: etl_sales_master
    upstream: start
    tasks:
      - type: extract
        op: python
        uses: libs.gcs.csv@1.1.0
        assets:
          - name: schema-mapping.json
            alias: schema
            convertor: basic
        params:
          path: gcs://{{ vars("PROJECT_ID") }}/sales/master/date/{ exec_date:%y }

      - task: transform
        upstream: extract
        op: docker
        uses: docker.rgt.co.th/image.transform:0.0.1
        assets:
          - name: transform-query.sql
            alias: transform
        params:
          path: gcs://{{ vars("PROJECT_ID") }}/landing/master/date/{ exec_date:%y }

      - task: sink
        op: python
        run: |
          import time
          time.sleep(5)

  - task: end
    upstream: etl_sales_master
    op: empty

"""# SALES DAG

This DAG will extract data from Google Cloud Storage to Google BigQuery LakeHouse
via DuckDB engine.

> This DAG is the temp DAG for ingest data to GCP.
"""
from dagtool import DagTool

dag = DagTool(name="sales", path=__file__, docs=__doc__)
dag.build_airflow_dags_to_globals(gb=globals())

Output:

The DAG that was built from this package will have the name is, sales_transaction.

Variable Sync

I will give the way to sync it:

1. Sync to Airflow Variable
2. Sync to Storage Object like GCS, ADLS, S3, etc.

💬 Contribute

I do not think this project will go around the world because it has specific propose, and you can create by your coding without this project dependency for long term solution. So, on this time, you can open the GitHub issue on this project :raised_hands: for fix bug or request new feature if you want it.