Google Cloud Tasks Decorator for Python 3 + Flask

A decorator for Python 3 + Flask that allows a function to run in the background via Google Cloud Tasks.

Usage

@decorator.push_queue
def send_email(subject, to, html):
    msg = Message(subject, recipients=to)
    msg.html = html
    msg.send()


# 1. Run in the background
send_email.delay("Hello", "johndoe@example.com", "Hello, world!")

# 2. Use function normally
send_email("Hello", "johndoe@example.com", "Hello, world!")

Dependencies

• google-cloud-tasks

Setup

Add this to your Flask application's init file

from google.cloud import tasks_v2

project = os.environ.get('GOOGLE_CLOUD_PROJECT')  # my-appengine-project
location = os.environ.get('CLOUD_TASK_LOCATION')  # us-central1
queue = os.environ.get('CLOUD_TASK_QUEUE')  # default

cloud_task_client = None
cloud_task_parent = None
if os.environ.get('GAE_ENV') == 'standard':
    cloud_task_client = tasks_v2.CloudTasksClient()
    cloud_task_parent = cloud_task_client.queue_path(project, location, queue)

Notes

The code is set to run in the background only when deployed in Google AppEngine environment. Please see delay() function in decorator.py, particularly line 36 if os.environ.get('GAE_ENV') == 'standard'.

If code is unmodified and ran outside Google AppEngine environment, .delay() will simply call the function directly.