A lightweight alternative to Celery for Django-PostgreSQL apps.

• django-pgpubsub

  11 221 8.1 Python

  A distributed task processing framework for Django built on top of the Postgres NOTIFY/LISTEN protocol.

  

Rather than relying on signals and celery, we may want to consider borrowing a pattern from the land of Postgres: Triggers and NOTIFY/LISTEN. The library django-pgpubsub offers a django application layer abstraction of this pattern. We can refactor our above solution using django-pgpubsub to look as follows:

• django-pgtrigger

  3 509 6.6 Python

  Write Postgres triggers for your Django models

  

Note that have now ditched our post_save signal from the previous solution. As we pointed out, signals can easily be missed. Instead, we are using a Postgres trigger : defining the listener as it is above makes use of the django-pgtrigger library to write a Postgres trigger to our database, the job of which is to notify our channel whenever a Comment is inserted in to the database. Triggers are far more robust than signals for detecting database write events; application level triggers can easily be missed, whereas triggers will always be executed.

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