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| return [[current.value.scan, false], current]; | ||
| } | ||
| const scan = Deferred.makeUnsafe<ReadonlyArray<EditorId>>(); | ||
| return [[scan, true], Option.some({ scan, expiresAtNanos: undefined })]; |
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🟡 Medium process/externalLauncher.ts:808
A discovery scan that never completes permanently blocks resolveAvailableEditors(): every later caller reuses the same unfinished Deferred and no replacement scan can start until restart. This happens because the pending entry stores expiresAtNanos: undefined and is cleared only by the scan's onExit; give pending scans a finite expiry so callers can start a replacement after the cache TTL.
| return [[scan, true], Option.some({ scan, expiresAtNanos: undefined })]; | |
| return [[scan, true], Option.some({ scan, expiresAtNanos: nowNanos + EDITOR_DISCOVERY_CACHE_TTL_NANOS })]; |
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In file @apps/server/src/process/externalLauncher.ts around line 808:
A discovery scan that never completes permanently blocks `resolveAvailableEditors()`: every later caller reuses the same unfinished `Deferred` and no replacement scan can start until restart. This happens because the pending entry stores `expiresAtNanos: undefined` and is cleared only by the scan's `onExit`; give pending scans a finite expiry so callers can start a replacement after the cache TTL.
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Not changing this. A scan that never settles can't block anything unboundedly: its only callers are server.getConfig/the config snapshot, which still bound it with the 5 s resolveAvailableEditorsForConfig timeout and degrade to no editors (the pre-PR behavior), and the late-snapshot wait, which ends with its subscription.
The suggested expiry would make things worse in the one case where a scan really hangs: a stat stuck on a dead network mount or PATH entry. A replacement scan every 60 s would hit the same entry and hang too, and each stuck fs.stat holds a libuv threadpool thread (4 by default), so piling up scans would starve every other filesystem call on the server. Keeping at most one scan in flight is deliberate. It also races with in-flight scans that take longer than the TTL, starting duplicates on a slow host, which is the situation this PR is about.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This targeted fix adds shared background discovery and late websocket configuration snapshots, changing cancellation, caching, and stream-state behavior in production. Focused tests help, but the concurrency and snapshot-folding logic plus unresolved Medium findings merit human review. Not approved because:
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: pingdotgg/t3code/.coderabbit.yaml Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (2)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughEditor discovery now shares scans across callers and caches successful results. Server config subscriptions can emit a later snapshot with discovered editor capabilities while retaining updates received during discovery. ChangesEditor discovery and server config
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant ConfigSubscription
participant EditorDiscovery
participant ConfigStream
ConfigSubscription->>EditorDiscovery: resolve editor capabilities
EditorDiscovery-->>ConfigSubscription: discovered editor config
ConfigSubscription->>ConfigStream: emit replacement snapshot
Merge Risk: ⚪ Minimal · up to This change lets editors appear after a slow discovery scan finishes, without cancelling the scan or reverting config updates received in the meantime. No actionable merge-blocking risk remains. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change retains authenticated read access and existing configuration fields. Shared discovery has coordinated startup, failure cleanup, and successful-result caching. No introduced security concern was established, but the longer-lived work and repeated snapshots warrant lifecycle review; complete shutdown behavior remains unverified. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, the fix, the affected behavior, and focused tests. It does not provide the required Scope and approval information, such as a triaged issue with explicit maintainer approval or a clear explanation for an approval exemption.
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Inline comments:
In @apps/server/src/ws.ts:
- Around line 3719-3725: Update lateEditorConfig to call resolveEditorConfig
before filtering, then emit the result when either availableEditors or
shellRevealInFileManagerKind differs from config; this lets unchanged editor
lists still trigger a fresh reveal-kind update.
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apps/server/src/process/externalLauncher.test.tsapps/server/src/process/externalLauncher.tsapps/server/src/server.test.tsapps/server/src/ws.ts
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| const next = { ...rest, ...event.editorConfig }; | ||
| return [next, [{ version: 1, type: "snapshot", config: next }]]; | ||
| } | ||
| case "keybindingsUpdated": |
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🟡 Medium src/ws.ts:3773
An opted-in subscribeServerConfig client loses its recently received environment themes or usage-limit sources when editorsResolved arrives. mapAccum forwards those events but leaves current unchanged, so the later snapshot is rebuilt from the original config without those fields; fold both update types into current before emitting the snapshot.
+ case "environmentThemesUpdated":
+ return [{ ...current, environmentThemes: event.payload.themes }, [event]];
+ case "usageLimitSourcesUpdated":
+ return [{ ...current, usageLimitSources: event.payload.sources }, [event]];
case "keybindingsUpdated":🤖 Copy this AI Prompt to have your agent fix this:
In file @apps/server/src/ws.ts around line 3773:
An opted-in `subscribeServerConfig` client loses its recently received environment themes or usage-limit sources when `editorsResolved` arrives. `mapAccum` forwards those events but leaves `current` unchanged, so the later snapshot is rebuilt from the original config without those fields; fold both update types into `current` before emitting the snapshot.
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Not changing this. Themes and usage-limit sources are never part of a config snapshot by contract (ServerConfig.environmentThemes / usageLimitSources docs in packages/contracts/src/server.ts): their streams replay the current set on subscribe, so putting them in the snapshot too would send every subscriber the same arrays twice.
The client is built around that. applyServerConfigProjection (packages/client-runtime/src/state/serverConfigProjection.ts) carries the previously projected themes and sources across any snapshot whose environment.capabilities advertise them, and the late snapshot keeps environment from the folded config, so those capabilities stay set. A late editorsResolved snapshot therefore can't drop either field on the client.
Folding them into the snapshot as suggested would break that contract and resend the arrays on the wire. Passing those events through without recording them is intentional.
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On a busy host, editor discovery can outlast server.getConfig's five-second bound. The timeout cancelled the scan, so nothing was cached, and the client kept the empty editor list from its one config snapshot until it reconnected. - Run discovery on one shared fiber in the launcher's scope. Callers that time out or disconnect stop waiting, but the scan finishes and is cached for every later connect. - When the scan finishes after a subscriber's snapshot went out without it, send a fresh snapshot. It is folded from the live updates already sent, so it cannot roll back a newer settings, provider, or keybindings change.
The reveal-kind probe has its own discovery timeout, so it can miss the snapshot even when the editor list made it. Re-probe once when the snapshot has the file manager but no reveal kind, and resend only if the editor config actually changed.
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Follow-up to #13669, continues fixing #4697. On a busy host (for example right after an update restarts the server alongside hundreds of git status checks), editor discovery can still outlast
server.getConfig's five-second bound. Server traces from an affected machine show one connect cut off at 5.009s and getting[], and a second connect 20 seconds later finishing in 3.5s. The window that got[]never recovered: the timeout cancelled its scan so nothing was cached, andavailableEditorsonly travels in the one-time config snapshot.Fix
subscribeServerConfigsends a freshsnapshot. Clients already replace their config on any snapshot, so there is no contract or client change. The resent config is folded from the live updates the stream has already sent rather than reloaded, so a settings, provider, or keybindings change that landed meanwhile is never rolled back.Tests
Not addressed here: each command lookup still re-stats every PATH directory to check its mtime, which is most of the ~1,500 filesystem calls on a 75-entry PATH. That now only delays the list rather than emptying it.
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