Source code for tests.system.providers.docker.example_docker_copy_data

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"""
This sample "listen to directory". move the new file and print it,
using docker-containers.
The following operators are being used: DockerOperator,
BashOperator & ShortCircuitOperator.
TODO: Review the workflow, change it accordingly to
your environment & enable the code.
"""
from __future__ import annotations

import os
from datetime import datetime

from docker.types import Mount

from airflow import models
from airflow.operators.bash import BashOperator
from airflow.operators.python import ShortCircuitOperator
from airflow.providers.docker.operators.docker import DockerOperator

[docs]ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
[docs]DAG_ID = "docker_sample_copy_data"
with models.DAG( DAG_ID, schedule="@once", start_date=datetime(2021, 1, 1), catchup=False, tags=["example", "docker"], ) as dag:
[docs] locate_file_cmd = """ sleep 10 find {{params.source_location}} -type f -printf "%f\n" | head -1 """
t_view = BashOperator( task_id="view_file", bash_command=locate_file_cmd, do_xcom_push=True, params={"source_location": "/your/input_dir/path"}, dag=dag, ) t_is_data_available = ShortCircuitOperator( task_id="check_if_data_available", python_callable=lambda task_output: not task_output == "", op_kwargs=dict(task_output=t_view.output), dag=dag, ) t_move = DockerOperator( api_version="1.19", docker_url="tcp://localhost:2375", # replace it with swarm/docker endpoint image="centos:latest", network_mode="bridge", mounts=[ Mount(source="/your/host/input_dir/path", target="/your/input_dir/path", type="bind"), Mount(source="/your/host/output_dir/path", target="/your/output_dir/path", type="bind"), ], command=[ "/bin/bash", "-c", "/bin/sleep 30; " "/bin/mv {{ params.source_location }}/" + str(t_view.output) + " {{ params.target_location }};" "/bin/echo '{{ params.target_location }}/" + f"{t_view.output}';", ], task_id="move_data", do_xcom_push=True, params={"source_location": "/your/input_dir/path", "target_location": "/your/output_dir/path"}, dag=dag, ) t_print = DockerOperator( api_version="1.19", docker_url="tcp://localhost:2375", image="centos:latest", mounts=[Mount(source="/your/host/output_dir/path", target="/your/output_dir/path", type="bind")], command=f"cat {t_move.output}", task_id="print", dag=dag, ) ( # TEST BODY t_is_data_available >> t_move >> t_print ) from tests.system.utils import get_test_run # noqa: E402 # Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
[docs]test_run = get_test_run(dag)

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