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from datetime import datetime
import boto3
from airflow import DAG
from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.providers.amazon.aws.hooks.s3 import S3Hook
from airflow.providers.amazon.aws.operators.athena import AthenaOperator
from airflow.providers.amazon.aws.operators.s3 import (
S3CreateBucketOperator,
S3CreateObjectOperator,
S3DeleteBucketOperator,
)
from airflow.providers.amazon.aws.sensors.athena import AthenaSensor
from airflow.utils.trigger_rule import TriggerRule
from tests.system.providers.amazon.aws.utils import SystemTestContextBuilder
[docs]sys_test_context_task = SystemTestContextBuilder().build()
[docs]DAG_ID = 'example_athena'
[docs]SAMPLE_DATA = '''"Alice",20
"Bob",25
"Charlie",30
'''
[docs]SAMPLE_FILENAME = 'airflow_sample.csv'
@task
[docs]def await_bucket(bucket_name):
# Avoid a race condition after creating the S3 Bucket.
client = boto3.client('s3')
waiter = client.get_waiter('bucket_exists')
waiter.wait(Bucket=bucket_name)
@task
[docs]def read_results_from_s3(bucket_name, query_execution_id):
s3_hook = S3Hook()
file_obj = s3_hook.get_conn().get_object(Bucket=bucket_name, Key=f'{query_execution_id}.csv')
file_content = file_obj['Body'].read().decode('utf-8')
print(file_content)
with DAG(
dag_id=DAG_ID,
schedule='@once',
start_date=datetime(2021, 1, 1),
tags=['example'],
catchup=False,
) as dag:
[docs] test_context = sys_test_context_task()
env_id = test_context['ENV_ID']
s3_bucket = f'{env_id}-athena-bucket'
athena_table = f'{env_id}_test_table'
athena_database = f'{env_id}_default'
query_create_database = f'CREATE DATABASE IF NOT EXISTS {athena_database}'
query_create_table = f'''CREATE EXTERNAL TABLE IF NOT EXISTS {athena_database}.{athena_table}
( `name` string, `age` int )
ROW FORMAT SERDE "org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe"
WITH SERDEPROPERTIES ( "serialization.format" = ",", "field.delim" = "," )
LOCATION "s3://{s3_bucket}//{athena_table}"
TBLPROPERTIES ("has_encrypted_data"="false")
'''
query_read_table = f'SELECT * from {athena_database}.{athena_table}'
query_drop_table = f'DROP TABLE IF EXISTS {athena_database}.{athena_table}'
query_drop_database = f'DROP DATABASE IF EXISTS {athena_database}'
create_s3_bucket = S3CreateBucketOperator(task_id='create_s3_bucket', bucket_name=s3_bucket)
upload_sample_data = S3CreateObjectOperator(
task_id='upload_sample_data',
s3_bucket=s3_bucket,
s3_key=f'{athena_table}/{SAMPLE_FILENAME}',
data=SAMPLE_DATA,
replace=True,
)
create_database = AthenaOperator(
task_id='create_database',
query=query_create_database,
database=athena_database,
output_location=f's3://{s3_bucket}/',
)
create_table = AthenaOperator(
task_id='create_table',
query=query_create_table,
database=athena_database,
output_location=f's3://{s3_bucket}/',
)
# [START howto_operator_athena]
read_table = AthenaOperator(
task_id='read_table',
query=query_read_table,
database=athena_database,
output_location=f's3://{s3_bucket}/',
)
# [END howto_operator_athena]
# [START howto_sensor_athena]
await_query = AthenaSensor(
task_id='await_query',
query_execution_id=read_table.output,
)
# [END howto_sensor_athena]
drop_table = AthenaOperator(
task_id='drop_table',
query=query_drop_table,
database=athena_database,
output_location=f's3://{s3_bucket}/',
trigger_rule=TriggerRule.ALL_DONE,
)
drop_database = AthenaOperator(
task_id='drop_database',
query=query_drop_database,
database=athena_database,
output_location=f's3://{s3_bucket}/',
trigger_rule=TriggerRule.ALL_DONE,
)
delete_s3_bucket = S3DeleteBucketOperator(
task_id='delete_s3_bucket',
bucket_name=s3_bucket,
force_delete=True,
trigger_rule=TriggerRule.ALL_DONE,
)
chain(
# TEST SETUP
test_context,
create_s3_bucket,
await_bucket(s3_bucket),
upload_sample_data,
create_database,
# TEST BODY
create_table,
read_table,
await_query,
read_results_from_s3(s3_bucket, read_table.output),
# TEST TEARDOWN
drop_table,
drop_database,
delete_s3_bucket,
)
from tests.system.utils.watcher import watcher
# This test needs watcher in order to properly mark success/failure
# when "tearDown" task with trigger rule is part of the DAG
list(dag.tasks) >> watcher()
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)
