Expose the Graphql queries tags in an Event

[arthur-akufen]

Hello!

We have a lot of headless Craft websites with a Nuxt frontend in front of the GraphQL API.

We'd like to have more control over the GraphQL query cache. Ideally, we would take some inspiration from the way WPGraphql-Smart-Cache works on the WordPress side and expose all the cache tags in a response header. This way, we could have Varnish or another caching layer use these tags to manually handle our caching strategy.

There is the EVENT_INVALIDATE_CACHES event that allows us to get all the tags that will be invalidated, but I don't think there is an event that triggers when the cache is created.

Would it make sense to update the EVENT_AFTER_EXECUTE_GQL_QUERY event so it returns the TagDependency array? This way, we can add this in a header or do some custom things with the list.

Thanks !

Arthur

[brandonkelly]

Easy enough! We just tagged Craft 5.9.11 which includes new $cacheTags and $cacheDuration properties added to ExecuteGqlQueryEvent. (9c6b6f1)

Note that they will only be set when a non-cached query is executed, however the event will fire even if the query was already cached.