process_employees.py

import datetime
import pendulum
import os

import requests
from airflow.decorators import dag, task
from airflow.providers.postgres.hooks.postgres import PostgresHook
from airflow.providers.postgres.operators.postgres import PostgresOperator


@dag(
    dag_id="process_employees",
    schedule_interval="0 0 * * *",
    start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
    catchup=False,
    dagrun_timeout=datetime.timedelta(minutes=60),
)
def ProcessEmployees():
    create_employees_table = PostgresOperator(
        task_id="create_employees_table",
        postgres_conn_id="tutorial_pg_conn",
        sql="""
            CREATE TABLE IF NOT EXISTS employees (
                "Serial Number" NUMERIC PRIMARY KEY,
                "Company Name" TEXT,
                "Employee Markme" TEXT,
                "Description" TEXT,
                "Leave" INTEGER
            );""",
    )

    create_employees_temp_table = PostgresOperator(
        task_id="create_employees_temp_table",
        postgres_conn_id="tutorial_pg_conn",
        sql="""
            DROP TABLE IF EXISTS employees_temp;
            CREATE TABLE employees_temp (
                "Serial Number" NUMERIC PRIMARY KEY,
                "Company Name" TEXT,
                "Employee Markme" TEXT,
                "Description" TEXT,
                "Leave" INTEGER
            );""",
    )

    @task
    def get_data():
        # NOTE: configure this as appropriate for your airflow environment
        data_path = "/opt/airflow/dags/files/employees.csv"
        #data_path = "/tmp/employees.csv"
        os.makedirs(os.path.dirname(data_path), exist_ok=True)

        url = "https://raw.githubusercontent.com/apache/airflow/main/docs/apache-airflow/tutorial/pipeline_example.csv"

        response = requests.request("GET", url)

        with open(data_path, "w") as file:
            file.write(response.text)

        postgres_hook = PostgresHook(postgres_conn_id="tutorial_pg_conn")
        conn = postgres_hook.get_conn()
        cur = conn.cursor()
        with open(data_path, "r") as file:
            cur.copy_expert(
                "COPY employees_temp FROM STDIN WITH CSV HEADER DELIMITER AS ',' QUOTE '\"'",
                file,
            )
        conn.commit()

    @task
    def merge_data():
        query = """
            INSERT INTO employees
            SELECT *
            FROM (
                SELECT DISTINCT *
                FROM employees_temp
            ) t
            ON CONFLICT ("Serial Number") DO UPDATE
            SET
              "Employee Markme" = excluded."Employee Markme",
              "Description" = excluded."Description",
              "Leave" = excluded."Leave";
        """
        try:
            postgres_hook = PostgresHook(postgres_conn_id="tutorial_pg_conn")
            conn = postgres_hook.get_conn()
            cur = conn.cursor()
            cur.execute(query)
            conn.commit()
            return 0
        except Exception as e:
            return 1

    [create_employees_table, create_employees_temp_table] >> get_data() >> merge_data()


dag = ProcessEmployees()