feat(server): make the pull request lookup interval a background activity setting - #12601
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR changes the default Balanced pull-request lookup behavior from the existing 60-second cache to five minutes and adds a production setting that affects CLI polling and PR discovery/settlement timing. The default change and resulting runtime behavior warrant human review. You can add or adjust custom eligibility rules. Learn more. |
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Included review availability: Your plan provides up to 10 included reviews per hour; 5 remain after this review. 📝 WalkthroughWalkthroughThe change adds a configurable pull request lookup interval to background activity settings. Presets and overrides resolve the interval, GitManager applies it to pull request caching, and the settings interface allows editing and searching. Tests cover throttling, refresh bypass, and overlapping lookups. ChangesPull request lookup interval
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant SettingsPanels
participant BackgroundActivitySettings
participant GitManager
participant GitHubCLI
SettingsPanels->>BackgroundActivitySettings: save pullRequestLookupInterval
BackgroundActivitySettings-->>GitManager: resolve interval
GitManager->>GitHubCLI: request pr list after entry TTL expiry
GitHubCLI-->>GitManager: return pull request data and entry TTL
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In `@apps/server/src/git/GitManager.ts`:
- Line 1074: Isolate the PR lookup TTL per cache entry instead of sharing
mutable prLookupTtl across concurrent loaders. Update the cache loader and
timeToLive callback in the PR lookup flow to carry and read each entry’s
resolved interval, preserving the selected settings value even when concurrent
fills overlap; add a regression test covering distinct concurrent fills during
an interval change.
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apps/server/src/git/GitManager.test.tsapps/server/src/git/GitManager.tsapps/web/src/components/settings/SettingsPanels.logic.tsapps/web/src/components/settings/SettingsPanels.tsxapps/web/src/components/settings/settingsSearch.tspackages/contracts/src/settings.tspackages/shared/src/backgroundActivitySettings.ts
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Part of #11220 and #12498: this bounds how often the hosting CLI runs for an unchanged branch. Whether the sweeps should run at all without a client, also raised there, is not decided here, so the issue stays open.
What Changed
The lifetime of a cached pull request lookup in
GitManagerwas a constant 60 seconds. It is now the Background Activity valuepullRequestLookupInterval, resolved like the other intervals there and never shorter than the old 60 seconds:Nothing else moves. Both sweeps keep their one-minute cadence, and every path that already bypasses the cache still does: a finished turn (
refresh: true), git actions and user refreshes (the lookup epoch), and failed lookups (their own backoff).Why
On an idle server, three readers ask "does this branch have a pull request" every minute, with or without a client:
ThreadPullRequestReactor(thread links),ThreadSettlementReactor(auto-settle) and remote status. They already share one cache,prLookupCache, and each miss is a hosting CLI process,gh pr list, about 0.9 s on the machine measured.The cache lifetime equals the sweep cadence, so by the time the next sweep comes around every entry has just expired. The cache dedupes the readers within one minute and saves nothing across minutes. On a real install with 12 unsettled thread branches, 11 of them untouched for 21 to 114 hours, a 10-minute idle trace had 179 process spawns, 132 of them
gh: about 11 a minute to re-ask a question whose answer last changed days ago.Why the cache lifetime, and not the sweep schedule
The obvious alternative is to slow down
ThreadPullRequestReactor's schedule. That does not work:ThreadSettlementReactorruns the same lookup for the same branches on its own minute (auto-settle on merge is on by default). With discovery slowed, settlement simply becomes the reader that misses the cache. Theghprocesses move, they do not go away. The trace above hid this only because that install has auto-settle off.The cache is the one place all three readers pass through, so one value there bounds the cost no matter who asks or how many sweeps exist later. The sweeps themselves become cheap: a cache hit costs a few local git metadata commands and no hosting CLI call.
What gets slower, and what does not
With the default going from 1 to 5 minutes:
PullRequestSyncReactorreads by number on its own minute, so their merge is still noticed within a minute; failed lookups and their backoff.The old comment on the constant said the 60 seconds was chosen so an external merge settles within about a minute. That is still exactly what Performance gives, and the comment now says what the trade is. If 5 minutes is the wrong default for Balanced, keeping Balanced at 1 minute and leaving only Battery saver slower makes this a pure opt-in with the same code.
Surfaces
BackgroundActivityOverrides. Old settings files decode unchanged. An older client that rewrites the overrides record drops the key, like every other key in that record.0cannot mean "every call".Tests
GitManager.test.ts, against a real repository and the fakegh: for Balanced and for Performance, a second lookup just before the interval elapses does not reach the host, one just after does, andrefresh: truedoes not wait.UI Changes
One new number field row in Settings → General → Background activity → Advanced, after the Git fetch row. No existing control changed, so there is no "before" beyond the row being absent.
Related
Other pull requests for #12498:
PATHscan done before every spawnChecklist
Model: Claude Fable 5.1. Harness: Claude Code, running inside T3 Code.
Summary by CodeRabbit
New Features
Performance