Source code for airflow.example_dags.example_inlet_event_extra

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"""
Example DAG to demonstrate reading asset events annotated with extra information.

Also see examples in ``example_outlet_event_extra.py``.
"""

from __future__ import annotations

import datetime

from airflow.decorators import task
from airflow.models.dag import DAG
from airflow.providers.standard.operators.bash import BashOperator
from airflow.sdk.definitions.asset import Asset


[docs]asset = Asset("s3://output/1.txt")


with DAG(
    dag_id="read_asset_event",
    catchup=False,
    start_date=datetime.datetime.min,
    schedule="@daily",
    tags=["consumes"],
):

    @task(inlets=[asset])

[docs]    def read_asset_event(*, inlet_events=None):
        for event in inlet_events[asset][:-2]:
            print(event.extra["hi"])


    read_asset_event()

with DAG(
    dag_id="read_asset_event_from_classic",
    catchup=False,
    start_date=datetime.datetime.min,
    schedule="@daily",
    tags=["consumes"],
):
    BashOperator(
        task_id="read_asset_event_from_classic",
        inlets=[asset],
        bash_command="echo '{{ inlet_events['s3://output/1.txt'][-1].extra | tojson }}'",
    )

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