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This PR optimizes the SQL query and de-duplicate the labels' ids when generating the query string, on the issue page. <hr/> ### Background Some time ago, BingBot and some other crawlers have been putting my instance on its knees with requests containing a lot of label ids, like this one : ``` [07/Aug/2023:11:28:37 +0200] "GET /Dolibarr/sendrecurringinvoicebymail/issues?q=&type=all&sort=&state=closed&labels=1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c2%2c10%2c2%2c1%2c1%2c10%2c10%2c7%2c6%2c10%2c10%2c3%2c2%2c1%2c5%2c10%2c1%2c6%2c2%2c7%2c3%2c7%2c6%2c10%2c1%2c10%2c1%2c1%2c7%2c7%2c1%2c1%2c1%2c1%2c10%2c10%2c1%2c2%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c1%2c2%2c1%2c12%2c6%2c6%2c10&milestone=0&project=-1&poster=0 HTTP/1.1" 499 0 "-" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/103.0.5060.134 Safari/537.36" ``` Since each of the label ids implies a join, it grows exponentially expensive for the database engine (at least on PostgreSQL but SQLite suffers a little too). Thus, this PR proposes two enhancements: * rewrite the database query to use only one squashed condition, * deduplicate the label ids when generating the URL. ### Performance comparison Here are some timings on Postgresql-backed, Forgejo 7.0.4 instances : ```sh $ time curl -s -o /dev/null "http://localhost:3000/toto/tata/issues?q=&type=all&sort=&labels=19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25&state=open&milestone=0&project=0&assignee=0&poster=0" real 0m10,491s user 0m0,017s sys 0m0,008s ``` ...and with the patch: ```sh $ time curl -s -o /dev/null "http://localhost:3000/toto/tata/issues?q=&type=all&sort=&labels=19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25%2c19%2c25&state=open&milestone=0&project=0&assignee=0&poster=0" real 0m0,094s user 0m0,012s sys 0m0,013s ``` ### Annex This issue was originally proposed to [Gitea](https://github.com/go-gitea/gitea/pull/26460) but didn't get much attention, and I switched to Forgejo in the meantime :) Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4228 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: Chl <chl@xlii.si> Co-committed-by: Chl <chl@xlii.si> |
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