[wp-trac] [WordPress Trac] #47871: Cache item schema in REST controllers

[WordPress Trac]

#47871: Cache item schema in REST controllers
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 Reporter:  joehoyle     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  5.3
Component:  REST API     |    Version:  4.7
 Severity:  normal       |   Keywords:
  Focuses:               |
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 The `get_item_schema` method on the REST controllers should be idempotent.
 These methods are called many times when validating schemas, sanitizing,
 `filter_response_by_context`, etc, and generating them isn't particularly
 cheap.

 https://core.trac.wordpress.org/ticket/41305 demonstrates one such place
 that adds overhead, also the Posts controller `get_item_schema` makes many
 calls and asks for a lot of data:
 https://github.com/WordPress/WordPress/blob/master/wp-includes/rest-
 api/endpoints/class-wp-rest-posts-controller.php#L1872

 We should look into caching these on the class instance. Doing a count on
 how many times these methods are called, say on a `/wp-json/` request
 should be easy, and indicate if there will be significant performance
 gains by doing this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47871>
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