django-cloud-tasks 0.0.4

Google Cloud Tasks integration for Django

Integrate Google Cloud Tasks with Django.

Package provides easy to use decorator to create task handlers.

App looks for tasks in cloud_tasks.py files in your installed applications and auto-registers them.

Package is in early alpha and it does not have any real security at the moment. You need to authorize requests coming to your instances yourself.

Prerequisites

• Django 1.8+

• Python 3.4, 3.5, 3.6

Dependencies

• google-api-python-client

Documentation

TODO

Installation

1. Install latest version from Github (PyPy package will be available as soon as stable version is released):

   pip install -e [e-mail]:GeorgeLubaretsi/django-cloud-tasks.git#egg=django_cloud_tasks

2. Add django_cloud_tasks to INSTALLED_APPS:

   INSTALLED_APPS = (
       # ...
       'django_cloud_tasks',
       # ...
   )

3. Add configuration to your settings

   DJANGO_CLOUD_TASKS={
       'project_location_name': 'projects/{project_name}/locations/us-central1',
       'task_handler_root_url': '/_tasks/',
   },
   
   # This setting allows you to debug your cloud tasks by running actual task handler function locally
   # instead of sending them to the task queue. Default: False
   DJANGO_CLOUD_TASKS_EXECUTE_LOCALLY = False
   
   # If False, running `.execute()` on remote task will simply log the task data instead of adding it to
   # the queue. Useful for debugging. Default: True
   DJANGO_CLOUD_TASKS_BLOCK_REMOTE_TASKS = False

4. Add cloud task views to your urls.py (must resolve to the same url as task_handler_root_url)

   # urls.py
   # ...
   from django.urls import path, include
   from django_cloud_tasks import urls as dct_urls
   
   urlpatterns = [
       # ...
       path('_tasks/', include(dct_urls)),
   ]

Quick start

Simply import the task decorator and define the task inside cloud_tasks.py in your app. First parameter should always be request which is populated after task is executed by Cloud Task service.

You can get actual request coming from Cloud Task service by accessing request.request in your task body and additional attributes such as: request.task_id`, `request.request_headers`

# cloud_tasks.py
# ...
from django_cloud_tasks.decorators import task

@task(queue='default')
def example_task(request, p1, p2):
    print(p1, p2)
    print(request.task_id)

Pushing the task to the queue:

from my_app.cloud_tasks import example_task

example_task(p1='1', p2='2').execute()

Pushing remote task to the queue (when task handler is defined elsewhere):

from django_cloud_tasks import remote_task
from django_cloud_tasks import batch_execute

example_task = remote_task(queue='my-queue', handler='remote_app.cloud_tasks.example_task'):
payload_1 = example_task(payload={'p1': 1, 'p2': '2'})
payload_2 = example_task(payload={'p1': 2, 'p2': '3'})

# Execute in batch:
batch_execute([payload_1, payload_2])

# Or one by one:
payload_1.execute()
payload_2.execute()

You can also send tasks in batch if latency is an issue and you have to send many small tasks to the queue (limited to 1000 at a time):

from my_app.cloud_tasks import example_task
from django_cloud_tasks import batch_execute

tasks = []
for i in range(0, 420):
    task = example_task(p1=i, p2=i)
    tasks.append(task)

batch_execute(tasks)

It is also possible to run an actual function using run method of CloudTaskWrapper object instance that is returned after task is called (this can be useful for debugging):

task = example_task(p1=i, p2=i)
task.run()