Event Listener for Publishing Scheduled Posts

Question

For performance reasons I'm caching full HTML responses to Redis. This does wonders for response times, but cache invalidation becomes a bit tricky... I'm currently purging the entire cache on 'entries.saveEntry' which will suffice most of the time.

The problem is with scheduled posts. Scheduled posts are not saved when they're published so the cache is not invalidated and the post doesn't show up unless I clear the cache manually. I need to register 2 events listeners to clear the cache: one on entry save and one one on publish. Does this second event exist? If not, is there a way to create one?

Answer 1

There isn't an event that fires when an entry with a future post date goes live, since it's just compared against the existing time and there's no guarantee that any PHP will be executing at that exact time.

You could write a cron job that hits a plugin's controller that checks every minute or so for any entries about to go live.

Or maybe adopt something similar to this for your Redis/full page caching solution.

Answer 2

I've created a plugin called Published Event does exactly what Brad suggests in his answer. It fires off an event when a entry moves from pending to live.