cloud_sql_query

Example Airflow DAG that performs query in a Cloud SQL instance.

Databases


Providers:

Run this DAG

1. Install the Astronomer CLI:Skip if you already have the CLI

2. Initate the project in a local directory:

3. Copy and paste the code below into a file in the

dags
directory.

4. Add the following to your

requirements.txt
file:

5. Run the DAG from the local directory where the project was initiated:

#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
"""
Example Airflow DAG that performs query in a Cloud SQL instance.
This DAG relies on the following OS environment variables
* GCP_PROJECT_ID - Google Cloud project for the Cloud SQL instance
* GCP_REGION - Google Cloud region where the database is created
*
* GCSQL_POSTGRES_INSTANCE_NAME - Name of the postgres Cloud SQL instance
* GCSQL_POSTGRES_USER - Name of the postgres database user
* GCSQL_POSTGRES_PASSWORD - Password of the postgres database user
* GCSQL_POSTGRES_PUBLIC_IP - Public IP of the Postgres database
* GCSQL_POSTGRES_PUBLIC_PORT - Port of the postgres database
*
* GCSQL_MYSQL_INSTANCE_NAME - Name of the postgres Cloud SQL instance
* GCSQL_MYSQL_USER - Name of the mysql database user
* GCSQL_MYSQL_PASSWORD - Password of the mysql database user
* GCSQL_MYSQL_PUBLIC_IP - Public IP of the mysql database
* GCSQL_MYSQL_PUBLIC_PORT - Port of the mysql database
"""
import os
import subprocess
from os.path import expanduser
from urllib.parse import quote_plus
from airflow import models
from airflow.providers.google.cloud.operators.cloud_sql import CloudSQLExecuteQueryOperator
from airflow.utils.dates import days_ago
GCP_PROJECT_ID = os.environ.get('GCP_PROJECT_ID', 'example-project')
GCP_REGION = os.environ.get('GCP_REGION', 'europe-west-1b')
GCSQL_POSTGRES_INSTANCE_NAME_QUERY = os.environ.get('GCSQL_POSTGRES_INSTANCE_NAME_QUERY', 'testpostgres')
GCSQL_POSTGRES_DATABASE_NAME = os.environ.get('GCSQL_POSTGRES_DATABASE_NAME', 'postgresdb')
GCSQL_POSTGRES_USER = os.environ.get('GCSQL_POSTGRES_USER', 'postgres_user')
GCSQL_POSTGRES_PASSWORD = os.environ.get('GCSQL_POSTGRES_PASSWORD', 'password')
GCSQL_POSTGRES_PUBLIC_IP = os.environ.get('GCSQL_POSTGRES_PUBLIC_IP', '0.0.0.0')
GCSQL_POSTGRES_PUBLIC_PORT = os.environ.get('GCSQL_POSTGRES_PUBLIC_PORT', 5432)
GCSQL_POSTGRES_CLIENT_CERT_FILE = os.environ.get(
'GCSQL_POSTGRES_CLIENT_CERT_FILE', ".key/postgres-client-cert.pem"
)
GCSQL_POSTGRES_CLIENT_KEY_FILE = os.environ.get(
'GCSQL_POSTGRES_CLIENT_KEY_FILE', ".key/postgres-client-key.pem"
)
GCSQL_POSTGRES_SERVER_CA_FILE = os.environ.get('GCSQL_POSTGRES_SERVER_CA_FILE', ".key/postgres-server-ca.pem")
GCSQL_MYSQL_INSTANCE_NAME_QUERY = os.environ.get('GCSQL_MYSQL_INSTANCE_NAME_QUERY', 'testmysql')
GCSQL_MYSQL_DATABASE_NAME = os.environ.get('GCSQL_MYSQL_DATABASE_NAME', 'mysqldb')
GCSQL_MYSQL_USER = os.environ.get('GCSQL_MYSQL_USER', 'mysql_user')
GCSQL_MYSQL_PASSWORD = os.environ.get('GCSQL_MYSQL_PASSWORD', 'password')
GCSQL_MYSQL_PUBLIC_IP = os.environ.get('GCSQL_MYSQL_PUBLIC_IP', '0.0.0.0')
GCSQL_MYSQL_PUBLIC_PORT = os.environ.get('GCSQL_MYSQL_PUBLIC_PORT', 3306)
GCSQL_MYSQL_CLIENT_CERT_FILE = os.environ.get('GCSQL_MYSQL_CLIENT_CERT_FILE', ".key/mysql-client-cert.pem")
GCSQL_MYSQL_CLIENT_KEY_FILE = os.environ.get('GCSQL_MYSQL_CLIENT_KEY_FILE', ".key/mysql-client-key.pem")
GCSQL_MYSQL_SERVER_CA_FILE = os.environ.get('GCSQL_MYSQL_SERVER_CA_FILE', ".key/mysql-server-ca.pem")
SQL = [
'CREATE TABLE IF NOT EXISTS TABLE_TEST (I INTEGER)',
'CREATE TABLE IF NOT EXISTS TABLE_TEST (I INTEGER)', # shows warnings logged
'INSERT INTO TABLE_TEST VALUES (0)',
'CREATE TABLE IF NOT EXISTS TABLE_TEST2 (I INTEGER)',
'DROP TABLE TABLE_TEST',
'DROP TABLE TABLE_TEST2',
]
# [START howto_operator_cloudsql_query_connections]
HOME_DIR = expanduser("~")
def get_absolute_path(path):
"""
Returns absolute path.
"""
if path.startswith("/"):
return path
else:
return os.path.join(HOME_DIR, path)
postgres_kwargs = dict(
user=quote_plus(GCSQL_POSTGRES_USER),
password=quote_plus(GCSQL_POSTGRES_PASSWORD),
public_port=GCSQL_POSTGRES_PUBLIC_PORT,
public_ip=quote_plus(GCSQL_POSTGRES_PUBLIC_IP),
project_id=quote_plus(GCP_PROJECT_ID),
location=quote_plus(GCP_REGION),
instance=quote_plus(GCSQL_POSTGRES_INSTANCE_NAME_QUERY),
database=quote_plus(GCSQL_POSTGRES_DATABASE_NAME),
client_cert_file=quote_plus(get_absolute_path(GCSQL_POSTGRES_CLIENT_CERT_FILE)),
client_key_file=quote_plus(get_absolute_path(GCSQL_POSTGRES_CLIENT_KEY_FILE)),
server_ca_file=quote_plus(get_absolute_path(GCSQL_POSTGRES_SERVER_CA_FILE)),
)
# The connections below are created using one of the standard approaches - via environment
# variables named AIRFLOW_CONN_* . The connections can also be created in the database
# of AIRFLOW (using command line or UI).
# Postgres: connect via proxy over TCP
os.environ['AIRFLOW_CONN_PROXY_POSTGRES_TCP'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=postgres&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=True&"
"sql_proxy_use_tcp=True".format(**postgres_kwargs)
)
# Postgres: connect via proxy over UNIX socket (specific proxy version)
os.environ['AIRFLOW_CONN_PROXY_POSTGRES_SOCKET'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=postgres&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=True&"
"sql_proxy_version=v1.13&"
"sql_proxy_use_tcp=False".format(**postgres_kwargs)
)
# Postgres: connect directly via TCP (non-SSL)
os.environ['AIRFLOW_CONN_PUBLIC_POSTGRES_TCP'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=postgres&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=False&"
"use_ssl=False".format(**postgres_kwargs)
)
# Postgres: connect directly via TCP (SSL)
os.environ['AIRFLOW_CONN_PUBLIC_POSTGRES_TCP_SSL'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=postgres&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=False&"
"use_ssl=True&"
"sslcert={client_cert_file}&"
"sslkey={client_key_file}&"
"sslrootcert={server_ca_file}".format(**postgres_kwargs)
)
mysql_kwargs = dict(
user=quote_plus(GCSQL_MYSQL_USER),
password=quote_plus(GCSQL_MYSQL_PASSWORD),
public_port=GCSQL_MYSQL_PUBLIC_PORT,
public_ip=quote_plus(GCSQL_MYSQL_PUBLIC_IP),
project_id=quote_plus(GCP_PROJECT_ID),
location=quote_plus(GCP_REGION),
instance=quote_plus(GCSQL_MYSQL_INSTANCE_NAME_QUERY),
database=quote_plus(GCSQL_MYSQL_DATABASE_NAME),
client_cert_file=quote_plus(get_absolute_path(GCSQL_MYSQL_CLIENT_CERT_FILE)),
client_key_file=quote_plus(get_absolute_path(GCSQL_MYSQL_CLIENT_KEY_FILE)),
server_ca_file=quote_plus(get_absolute_path(GCSQL_MYSQL_SERVER_CA_FILE)),
)
# MySQL: connect via proxy over TCP (specific proxy version)
os.environ['AIRFLOW_CONN_PROXY_MYSQL_TCP'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=mysql&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=True&"
"sql_proxy_version=v1.13&"
"sql_proxy_use_tcp=True".format(**mysql_kwargs)
)
# MySQL: connect via proxy over UNIX socket using pre-downloaded Cloud Sql Proxy binary
try:
sql_proxy_binary_path = subprocess.check_output(['which', 'cloud_sql_proxy']).decode('utf-8').rstrip()
except subprocess.CalledProcessError:
sql_proxy_binary_path = "/tmp/anyhow_download_cloud_sql_proxy"
os.environ['AIRFLOW_CONN_PROXY_MYSQL_SOCKET'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=mysql&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=True&"
"sql_proxy_binary_path={sql_proxy_binary_path}&"
"sql_proxy_use_tcp=False".format(sql_proxy_binary_path=quote_plus(sql_proxy_binary_path), **mysql_kwargs)
)
# MySQL: connect directly via TCP (non-SSL)
os.environ['AIRFLOW_CONN_PUBLIC_MYSQL_TCP'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=mysql&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=False&"
"use_ssl=False".format(**mysql_kwargs)
)
# MySQL: connect directly via TCP (SSL) and with fixed Cloud Sql Proxy binary path
os.environ['AIRFLOW_CONN_PUBLIC_MYSQL_TCP_SSL'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=mysql&"
"project_id={project_id}&"
"location={location}&"
"instance={instance}&"
"use_proxy=False&"
"use_ssl=True&"
"sslcert={client_cert_file}&"
"sslkey={client_key_file}&"
"sslrootcert={server_ca_file}".format(**mysql_kwargs)
)
# Special case: MySQL: connect directly via TCP (SSL) and with fixed Cloud Sql
# Proxy binary path AND with missing project_id
os.environ['AIRFLOW_CONN_PUBLIC_MYSQL_TCP_SSL_NO_PROJECT_ID'] = (
"gcpcloudsql://{user}:{password}@{public_ip}:{public_port}/{database}?"
"database_type=mysql&"
"location={location}&"
"instance={instance}&"
"use_proxy=False&"
"use_ssl=True&"
"sslcert={client_cert_file}&"
"sslkey={client_key_file}&"
"sslrootcert={server_ca_file}".format(**mysql_kwargs)
)
# [END howto_operator_cloudsql_query_connections]
# [START howto_operator_cloudsql_query_operators]
connection_names = [
"proxy_postgres_tcp",
"proxy_postgres_socket",
"public_postgres_tcp",
"public_postgres_tcp_ssl",
"proxy_mysql_tcp",
"proxy_mysql_socket",
"public_mysql_tcp",
"public_mysql_tcp_ssl",
"public_mysql_tcp_ssl_no_project_id",
]
tasks = []
with models.DAG(
dag_id='example_gcp_sql_query',
schedule_interval=None,
start_date=days_ago(1),
tags=['example'],
) as dag:
prev_task = None
for connection_name in connection_names:
task = CloudSQLExecuteQueryOperator(
gcp_cloudsql_conn_id=connection_name, task_id="example_gcp_sql_task_" + connection_name, sql=SQL
)
tasks.append(task)
if prev_task:
prev_task >> task
prev_task = task
# [END howto_operator_cloudsql_query_operators]