Source code for airflow.example_dags.example_inlet_event_extra

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

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

from __future__ import annotations

import datetime

from airflow.datasets import Dataset
from airflow.decorators import task
from airflow.models.dag import DAG
from airflow.operators.bash import BashOperator

[docs]ds = Dataset("s3://output/1.txt")

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

    @task(inlets=[ds])
[docs]    def read_dataset_event(*, inlet_events=None):
        for event in inlet_events[ds][:-2]:
            print(event.extra["hi"])

    read_dataset_event()

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