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Variables and Connections

Note

dbt-coves generate airflow-dags does not support reading variables/connections, but you may generate the initial Python Airflow DAG and add the connection / variable information.

The best way to store and retrieve information within Airflow is to use Variables and Connections , both available on the Admin upper dropdown.

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The main difference between them is that Variables is a generic multi-purpose store, while Connections are aimed at third-party providers.

Usage

Variables

After creating a variable in Airflow's UI, using it is as simple as importing the Variable model in your DAG and getting it's name.

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from airflow.decorators import dag
from operators.datacoves.dbt import DatacovesDbtOperator
from airflow.models import Variable

daily_run_tag = Variable.get("DBT_DAILY_RUN_TAG")

@dag(
    default_args={"start_date": "2021-01"},
    description="DAG that outputs a Variable",
    schedule_interval="0 0 1 */12 *",
    tags=["version_1"],
    catchup=False,
)
def variables_dag():
    transform = DatacovesDbtOperator(
        task_id="transform",
        bash_command=f"dbt build -s 'tag:{daily_run_tag}'",
    )

dag = variables_dag()

If a variable contains SECRET on it's name, value will be hidden: 

s3_password = Variable.get("S3_PASSWORD_SECRET")
[...]
transform = DatacovesDbtOperator(
    task_id="transform",
    bash_command=f"echo {s3_password}'",
)

Running command: ['bash', '-c', "source /opt/datacoves/virtualenvs/main/bin/activate" &&'echo ***']

Connections

Consuming connections data is also straightforward, though you need to take it's attributes into consideration, as they'll vary depending on the provider.

In the following example, a connection of type Airbyte is created, and it's host is echoed in a DAG.

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from airflow.decorators import dag
from operators.datacoves.bash import DatacovesBashOperator
from airflow.models import Connection

airbyte_connection = Connection.get_connection_from_secrets(conn_id="AIRBYTE_CONNECTION")

@dag(
    default_args={"start_date": "2021-01"},
    description="DAG that outputs Airbyte Hostname",
    schedule_interval="0 0 1 */12 *",
    tags=["version_1"],
    catchup=False,
)
def connections_dag():
    echo_airbyte_host = DatacovesBashOperator(
        task_id="echo_airbyte_host",
        bash_command=f"echo 'Airbyte hostname is {airbyte_connection.host}'",
    )

dag = connections_dag()