Automatically Reschedule Cron Events

[n7studios]

Summary

Fixes the below reported issues, by ensuring that the Broadcast to Posts WordPress Cron Event exists, should it be deleted by a third party Plugin.

https://app.intercom.com/a/inbox/e4n3xtxz/inbox/shared/all/conversation/12263836210039?view=List
https://app.intercom.com/a/inbox/e4n3xtxz/inbox/shared/all/conversation/12263835305931?view=List
https://app.intercom.com/a/inbox/e4n3xtxz/inbox/shared/all/conversation/12263835371174?view=List
https://app.intercom.com/a/inbox/e4n3xtxz/inbox/shared/all/conversation/12263835396821?view=List

In turn, the 'Import Now' button will be displayed, and Broadcasts will import to WordPress Posts )if the functionality is enabled in the Plugin's settings).

Testing

• testBroadcastsCronEventRecreatedWhenDeleted: Acceptance test to confirm the Cron event is recreated when deleted.
• testCronEventRecreatedAfterDeleted: Unit test to confirm Cron event is recreated when deleted.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

[noelherrick]

Would this have performance effects for slow instances or for ones that get a lot of traffic?

[n7studios]

Would this have performance effects for slow instances or for ones that get a lot of traffic?

If the cron event isn't missing, performance is exactly the same compared to the main branch:

If the cron event is missing, an additional 2 queries are run one time to restore it:

It won't have a performance effect, as it only schedules the cron event if it's missing. Stack trace to check results in querying a row from the wp_options table, which is already loaded, typically from cache:

get_cron_event()
wp_get_schedule()
wp_get_scheduled_event()
_get_cron_array()
get_option()