[wp-trac] [WordPress Trac] #43525: Add a method to generate the image subsizes with multiple requests

[WordPress Trac]

#43525: Add a method to generate the image subsizes with multiple requests
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 Reporter:  azaozz       |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  5.0
Component:  Media        |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by azaozz):

 Thanks @enshrined this looks pretty good.

 > it can be a really frustrating issue, especially when themes/plugins
 define lots of image sizes.

 Yeah, exactly. Most shared servers would have enough resources to generate
 WPs default image subsizes, but when themes and plugins start adding more
 and more it becomes pretty intensive.

 Thinking we'll probably do wp_cron in combination with "self requests" to
 trigger it right after an image is uploaded (some smaller or cached sites
 may not get the necessary "hits" soon enough). Of courses there will be
 some sensible limit on this wp_cron loop. Also if there is an error we
 will have to set it on the attachment post (meta) and display in the UI so
 the user can retry.

 There should also be a way for the user to retry creating just the missing
 sizes. We may actually be able to fix this by getting the user more
 involved in the process. Adding a check if all files have been created,
 outputting an error when not, and a button to try to create the rest.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43525#comment:3>
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