Caching: Refactor enterprise query caching middleware to a wire service #65616
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…from query logic.
* introduce new feature toggle * hide calls to new service behind a feature flag * remove licensing flag from toggle (misunderstood what it was for)
mmandrus
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tskarhed and
yaelleC
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alexmobo
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Apr 14, 2023
…ce (#65616) * define initial service and add to wire * update caching service interface * add skipQueryCache header handler and update metrics query function to use it * add caching service as a dependency to query service * working caching impl * propagate cache status to frontend in response * beginning of improvements suggested by Lean - separate caching logic from query logic. * more changes to simplify query function * Decided to revert renaming of function * Remove error status from cache request * add extra documentation * Move query caching duration metric to query package * add a little bit of documentation * wip: convert resource caching * Change return type of query service QueryData to a QueryDataResponse with Headers * update codeowners * change X-Cache value to const * use resource caching in endpoint handlers * write resource headers to response even if it's not a cache hit * fix panic caused by lack of nil check * update unit test * remove NONE header - shouldn't show up in OSS * Convert everything to use the plugin middleware * revert a few more things * clean up unused vars * start reverting resource caching, start to implement in plugin middleware * revert more, fix typo * Update caching interfaces - resource caching now has a separate cache method * continue wiring up new resource caching conventions - still in progress * add more safety to implementation * remove some unused objects * remove some code that I left in by accident * add some comments, fix codeowners, fix duplicate registration * fix source of panic in resource middleware * Update client decorator test to provide an empty response object * create tests for caching middleware * fix unit test * Update pkg/services/caching/service.go Co-authored-by: Arati R. <33031346+suntala@users.noreply.github.com> * improve error message in error log * quick docs update * Remove use of mockery. Update return signature to return an explicit hit/miss bool * create unit test for empty request context * rename caching metrics to make it clear they pertain to caching * Update pkg/services/pluginsintegration/clientmiddleware/caching_middleware.go Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com> * Add clarifying comments to cache skip middleware func * Add comment pointing to the resource cache update call * fix unit tests (missing dependency) * try to fix mystery syntax error * fix a panic * Caching: Introduce feature toggle to caching service refactor (#66323) * introduce new feature toggle * hide calls to new service behind a feature flag * remove licensing flag from toggle (misunderstood what it was for) * fix unit tests * rerun toggle gen --------- Co-authored-by: Arati R. <33031346+suntala@users.noreply.github.com> Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>
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What is this feature?
This work converts the enterprise query caching implementation from middleware to a service injected by wire. The OSS implementation of this service does nothing, while the enterprise service functionality remains the same.
This new implementation will live behind a feature flag in the near term. Once we have verified its stability, we will remove the flag.
Why do we need this feature?
Benefits of doing this include:
Who is this feature for?
Enterprise customers using query caching, and OSS developers.
Which issue(s) does this PR fix?:
Fixes https://github.com/grafana/grafana-enterprise/issues/4666
Special notes for your reviewer:
Corresponding enterprise PR is here https://github.com/grafana/grafana-enterprise/pull/4851
The majority of interactions with the cache happen in the new plugin middleware, in order to consolidate things as best as possible. There is a follow-up task to fully consolidate the resource caching usage.