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Cloud Composer Examples

This example demonstrates how to test Airflow DAGs using then deploy them to Cloud Composer using with Cloud Build.

Run build using Cloud Build

The included cloudbuild.yaml file has the following flow:

  1. Build Airflow DAGs Builder: Builds a docker image with airflow dependencies included
  2. Validation Test: Check that the DAGs load correctly
  3. End to End Test: Backfill DAGs for a specific date with some variables set.
  4. Deploy DAGs: copy DAGs to a target Cloud Composer DAGs folder in GCS

To enable this,

  • Create a Cloud Build trigger, and point it at the examples/cloud-composer-cicd/cloudbuild.yaml file.
  • Set the substitution variable _DEPLOY_DAGS_LOCATION to the GCS path that your cloud composer environment is using for dags eg: gs://my-composer-env-bucket/dags/
  • Set the substitution variable _DIRECTORY to examples/cloud-composer-cicd (this allows the cloudbuild.yaml to be generalized for other project structures).

Now you can trigger the build.

Running validation test locally

The file dag_integrity_test.py will test the DAG integrity of the available airflow environment. To test the dags folder in this example locally, you can run:

pip install -r requirements.txt
export AIRFLOW_HOME=`pwd`/tmp
export AIRFLOW__CORE__LOAD_EXAMPLES=False
export AIRFLOW__CORE__DAGS_FOLDER=`pwd`/dags
airflow initdb
python -m unittest tests/dag_integrity_test.py

Running build locally with cloud build emulator

Alternatively you can run these tests locally using the cloud build emulator. This requires docker to be running.

cloud-build-local --config=cloudbuild.yaml --dryrun=false \
  --substitutions=_DEPLOY_DAGS_LOCATION=gs://my-composer-env-bucket/dags/,_DIRECTORY=examples/cloud-composer-cicd ../../

You can run the full build without deploying your DAGs by directing the DAGs to /tmp

cloud-build-local --config=cloudbuild.yaml --dryrun=false \
  --substitutions=_DEPLOY_DAGS_LOCATION=/tmp,_DIRECTORY=examples/cloud-composer-cicd ../../