capture_export_dag.py

from datetime import datetime, timedelta
from textwrap import dedent
from pprint import pprint
from airflow import DAG
from airflow.providers.postgres.operators.postgres import PostgresOperator
from airflow.providers.postgres.hooks.postgres import PostgresHook
from airflow.operators.bash import BashOperator
from airflow.operators.python import PythonOperator
import psycopg2.extras
from airflow.utils.dates import days_ago
from lib.capture_export import capture_export
from lib.utils import on_failure_callback
from airflow.models import Variable

# These args will get passed on to each operator
# You can override them on a per-task basis during operator initialization
default_args = {
    'owner': 'airflow',
    'depends_on_past': False,
    'email': ['airflow@example.com'],
    'email_on_failure': False,
    'email_on_retry': False,
    'retries': 0,
    'retry_delay': timedelta(minutes=5),
    # 'queue': 'bash_queue',
    # 'pool': 'backfill',
    # 'priority_weight': 10,
    # 'end_date': datetime(2016, 1, 1),
    # 'wait_for_downstream': False,
    # 'dag': dag,
    # 'sla': timedelta(hours=2),
    # 'execution_timeout': timedelta(seconds=300),
    'on_failure_callback': on_failure_callback, # needs to be set in default_args to work correctly: https://github.com/apache/airflow/issues/26760
    # 'on_success_callback': some_other_function,
    # 'on_retry_callback': another_function,
    # 'sla_miss_callback': yet_another_function,
    # 'trigger_rule': 'all_success'
}
with DAG(
    'capture_export',
    default_args=default_args,
    description='capture_export version 1',
    schedule_interval='@hourly',
    start_date=days_ago(2),
    catchup=False,
    tags=['CKAN', 'freetown'],
) as dag:

    t1 = BashOperator(
        task_id='print_date',
        bash_command='date',
    )

    postgresConnId = "postgres_default"

    def capture_export_wrap(ds, **kwargs):
      from lib.utils import print_time
      db = PostgresHook(postgres_conn_id=postgresConnId)
      conn = db.get_conn()  
      try:
        #   # generate last month 
        #   # get the month value of the last month
        #   now = datetime.now()
        #   last_month = now.month - 1
        #   # get the year value of the last month
        #   last_year = now.year
        #   if last_month == 0:
        #       last_month = 12
        #       last_year = now.year - 1
        #   print ("last_month:", last_month)
        #   print ("last_year:", last_year)
        #   # get the last month
        #   year_month = str(last_year) + "-" + str(last_month)
        #   print ("year_month:", year_month)
          date = datetime.now().strftime("%Y-%m-%d")
          print("date:", date)
          CKAN_DOMAIN = Variable.get("CKAN_DOMAIN")
          # check if CKAN_DOMAIN exists
          assert CKAN_DOMAIN
          CKAN_DATASET_NAME= Variable.get("CKAN_DATASET_NAME")
          assert CKAN_DATASET_NAME
          CKAN_API_KEY = Variable.get("CKAN_API_KEY")
          assert CKAN_API_KEY
          ckan_config = {
                "CKAN_DOMAIN": CKAN_DOMAIN,
                "CKAN_DATASET_NAME": CKAN_DATASET_NAME,
                "CKAN_API_KEY": CKAN_API_KEY,
            }
          print("ckan_config:", ckan_config)
          capture_export(conn, date, 178, ckan_config)
          return 0
      except Exception as e:
          print("get error when exec SQL:", e)
          raise ValueError('Error executing query')
          return 1

    capture_export_task = PythonOperator(
        task_id='capture_export',
        python_callable=capture_export_wrap,
        )


    capture_export_task >> t1