# Airflow Agent

- PR: https://github.com/flyteorg/flytekit/pull/1782

## Prerequisite
- Install Airflow and Flytekit

RUN pip install apache-airflow
RUN pip install google-cloud-orchestration-airflow==1.9.1
RUN pip install apache-airflow-providers-google
RUN pip install jsonpickle
pip install git+https://github.com/flyteorg/flytekit.git@873c60e505bb3492b5e3fa09840836b4d6775f4b#subdirectory=plugins/flytekit-airflow

## Authenticating to Google Cloud
Use [default credentials](https://airflow.apache.org/docs/apache-airflow-providers-google/stable/connections/gcp.html#note-on-application-default-credentials) to connec to Google Cloud

export AIRFLOW_CONN_GOOGLE_CLOUD_DEFAULT='google-cloud-platform://'
export GOOGLE_APPLICATION_CREDENTIALS=/Users/kevin/.config/gcloud/application_default_credentials.json

## Run the workflow locally

from datetime import timedelta

from airflow.utils import trigger_rule

from flytekit import workflow
from airflow.providers.google.cloud.operators.dataproc import DataprocCreateClusterOperator, DataprocDeleteClusterOperator, DataprocSubmitSparkJobOperator


@workflow
def wf():
    create_cluster = DataprocCreateClusterOperator(
        task_id="create_dataproc_cluster",
        image_version="2.0.27-debian10",
        storage_bucket="opta-gcp-dogfood-gcp",
        master_machine_type="n1-highmem-32",
        master_disk_size=1024,
        num_workers=2,
        worker_machine_type="n1-highmem-64",
        worker_disk_size=1024,
        region="us-west1",
        cluster_name="flyte-dataproc",
        project_id="dogfood-gcp-dataplane",
    )

    run_spark = DataprocSubmitSparkJobOperator(
        job_name="spark_pi",
        task_id="run_spark",
        dataproc_jars=["file:///usr/lib/spark/examples/jars/spark-examples.jar"],
        main_class="org.apache.spark.examples.JavaWordCount",
        arguments=["gs://opta-gcp-dogfood-gcp/spark/file.txt"],
        cluster_name="flyte-dataproc",
        region="us-west1",
        project_id="dogfood-gcp-dataplane",
    )

    delete_cluster = DataprocDeleteClusterOperator(
        task_id="create_dataproc_cluster",
        project_id="dogfood-gcp-dataplane",
        cluster_name="flyte-dataproc",
        region="us-west1",
        retries=3,
        retry_delay=timedelta(minutes=5),
        email_on_failure=True,
        trigger_rule=trigger_rule.TriggerRule.ALL_DONE
    )

    create_cluster >> run_spark >> delete_cluster


if __name__ == '__main__':
    wf()

from airflow.sensors.filesystem import FileSensor
from flytekit import task, workflow, ImageSpec


airflow_plugin = "git+https://github.com/flyteorg/flytekit.git@487438ab59147879eded897674593a1eaee1c78b#subdirectory=plugins/flytekit-airflow"
image_spec = ImageSpec(base_image="pingsutw/flytekit:v1", packages=["apache-airflow", airflow_plugin], apt_packages=["git"], registry="pingsutw")


@task(container_image=image_spec)
def t1():
    print("flyte")


@workflow
def wf():
    sensor = FileSensor(task_id="id", filepath="/tmp/1234")
    sensor >> t1()


if __name__ == '__main__':
    wf()