Django websub subscriber
Project description
Django websub subscriber.
Installation
pip install websubsub
Add websubsub.apps.WebsubsubConfig to the list of INSTALLED_APPS in your settings.py:
INSTALLED_APPS = [ ..., 'websubsub.apps.WebsubsubConfig' ]
Set the SITE_URL setting in your settings.py to the full url of your project site, e.g. https://example.com. It will be used to build full callback urls.
Set WEBSUBS_REDIS_URL settings in your settings.py. Redis locks are used to ensure subscription/unsubscription tasks are consistent with hub and local database.
SITE_URL = 'http://example.com' WEBSUBS_REDIS_URL = 'redis://redishost:6379'
Add websubsub.tasks.refresh_subscriptions and websubsub.tasks.retry_failed to celerybeat schedule. If you define it in settings.py:
CELERY_BEAT_SCHEDULE = { 'websub_refresh': { 'task': 'websubsub.tasks.refresh_subscriptions', 'schedule': 3600 # Hourly }, 'websub_retry': { 'task': 'websubsub.tasks.retry_failed', 'schedule': 600 # Every 10 minutes }, }
Usage
Create Websub callback
Create celery task handler, usually in tasks.py:
from celery import shared_task @shared_task def news_task(data): print('got news!')
Callback url should end with uuid. Register url for handler in urls.py:
from websubsub.views import WssView from .tasks import news_task, reports_task urlpatterns = [ path('/websubcallback/news/<uuid:id>', WssView.as_view(news_task), name='webnews') path('/websubcallback/reports/<uuid:id>', WssView.as_view(reports_task), name='webreports') ]
Subscribe
You can create subscription on the go, or use static subscriptions.
To create subscription in the code:
from websubsub.models import Subscription Subscription.create(topic='mytopic', urlname='webnews', hub='http://example.com')
This will create Subscription object in the database and schedule celery task to subscribe with hub.
Static subscriptions
[TODO] Not sure it is the best way to handle static subscriptions.
Static subscriptions can be defined in your settings.py, they are then materialized with management command ./manage.py websubscribe_static.
Add static subscriptions in your settings.py:
WEBSUBS_HUBS = { 'http://example.com': { 'subscriptions': [ # (topic, urlname) pairs ('mytopic', 'webnews'), ... ] } }
Execute ./manage.py websubscribe_static
Unsubscribe
To unsubscribe existing subscription, call Subscription.unsubscribe() method:
from websubsub.models import Subscription Subscription.objects.get(pk=4).unsubscribe()
Discovery
Not implemented
Settings
SITE_URL - ex.: https://example.com. Required. Will be used to build full callback urls.
WEBSUBS_REDIS_URL - ex.: redis://redishost:6379. Required. Will be used to lock atomic tasks.
WEBSUBS_DEFAULT_HUB_URL
WEBSUBS_MAX_CONNECT_RETRIES
WEBSUBS_MAX_HUB_ERROR_RETRIES
WEBSUBS_MAX_VERIFY_RETRIES
WEBSUBS_VERIFY_WAIT_TIME - How many seconds should pass before unverified subscription is considered failed. After that time, websubsub.tasks.retry_failed() task will be able to retry subscription process again.
Project details
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