Storage Signals

[Darrel O'Pry]

It would be nice if Storage emitted signals on file operations, so file related processes can be implemented without tight coupling.

Use cases:

• purging files in CDNs
• generating derivative assets
• virus scanning

Proposed Signals:

• post_save
• post_delete

My initial thoughts on the implementation would be to modify Storage.delete to delegate to ._delete like .save and to put the signal triggering in .save and .delete. Alternatively, it could be implemented in a Mixin like we are doing in our project.

storage_post_save = Signal()
storage_post_delete = Signal()


class SignalingStorageMixin:
    def save(self, name, content, max_length=None):
        super().save(name, content, max_length)
        # send a signal so we can react as files are uploaded in order to purge the cache.
        storage_post_save.send(sender=self.__class__, name=name)

    def delete(self, name):
        """
        Delete the specified file from the storage system.
        """
        super().delete(name)
        storage_post_delete.send(sender=self.__class__, name=name)

[Natalia Bidart]

Hello Darrel! The current procedure to ​propose/request new features is to post a new message to the ​Django Forum to reach a wider audience and to get community consensus there. Once there is an agreement and desire to include the proposed feature in Django, this ticket can be re-opened. Thank you!

[Darrel O'Pry]

Thanks for the feedback. I'm sorry but I'm not interested in yet another a login on yet another site.