Add cache to store user data and add filter to bypass visibility check #1677
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chriszarate
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Jan 17, 2021
There has been a long-standing performance issue with the is_private method of the User model, because it attempts to count the number of published posts for each user, a potentially very expensive operation. And since the operation is uncached, this can very quickly overwhelm the database. More discussion of the issue: wp-graphql#961 At Quartz, this has prevented us from upgrading WPGraphQL, and it appears to have affected other users as well. A few different PRs exist to address this issue: wp-graphql#962 wp-graphql#972 wp-graphql#1677 This PR is my attempt to fix this issue the way that Jason and others have described as ideal: using DataLoader. Instead of creating a new loader (e.g., "UserVisibilityLoader"), I am including this in UserLoader. The reason is that they seem tightly coupled and making them separate would just introduce unnecessary complexity. You'd need to remember to use UserVisibilityLoader everywhere you used UserLoader or risk losing the performance benefit it provides. My fix simply plugs into the existing "loadKeys" implementation and produces a single query that determines visibility for each user. I'd love feedback on the efficiency of this query; I hope that this is good enough to sidestep the need for caching. If its not possible to generate a single efficient query, generating an extra query for each user along the lines of `SELECT id FROM wp_posts WHERE post_author = X LIMIT 1` seems like the next best approach. Finally, we need a way to provide the visibility to the User model. Luckily, WP_User is not a final class and provides a setter: https://developer.wordpress.org/reference/classes/wp_user/__set/ This allows us to set an "is_private" property on the WP_User instance, which is then available to the model via "$this->data". This seems to be done widely, but we could implement a wrapper around WP_User if we wanted to avoid mutating WP_User instances. From there, it's a very simple matter of having the User model check this property.
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superceded by #2031 |
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