Sandbox::https://github.com/janosmiko/lfk/issues/667

janosmiko · 2026-08-21T09:16:16Z

The bug

Enter a context, then drill into a resource type before the apiserver answers the discovery request. If discovery then fails, handleAPIResourceDiscoveryError replaced your pod list with the seed resource-type sidebar and wrote those resource types into itemCache["<ctx>/pods"], so going back and re-entering served the poisoned entry.

The fallback guarded only on m.loading and keyed the cache with m.navKey(), neither of which says anything about which level the user is on.

Entering a context fires discoverAPIResources (update_navigation.go:409), so the window is real: the user drills in while that request is still outstanding.

The fix

The fallback now guards isCurrentContext && m.nav.Level == model.LevelResourceTypes && m.loading, mirroring the success branch, and keys the cache with m.nav.Context.

The key change is a no-op in every state the new guard can reach, since nav.ResourceType, ResourceName and OwnedName are all cleared at that level. It is there to make the intent explicit rather than to fix a second bug.

One asymmetry against the success branch is deliberate. The success path caches unconditionally when the context matches, even at deeper levels, because it has real discovered data. The error path caches only inside the level guard, because on failure it has nothing but a seed list, and writing that while the user is deeper is the bug.

Where CodeRabbit had it

CodeRabbit flagged this on #663 and named LevelResourceTypes as the vulnerable level. That level is actually safe: back-navigation clears nav.ResourceType, so navKey() already equals nav.Context, and syncExpandedGroup clamps the cursor. The reachable case is one level deeper, at LevelResources. The finding was worth chasing, but not where it pointed.

Test plan

TestDiscoveryFailureAtResourceLevelLeavesMiddleColumnAlone — fails against the pre-fix file, passes now. Verified by running it against a copy of the parent's update_resources_discovery.go
TestDiscoveryFailureAtResourceTypesLevelSeedsAndCachesUnderContext — pins the intentional fallback so a future change cannot quietly remove it
go build ./... and go vet ./... clean
go test -race ./... — 26 packages ok. TestExplainFetchesStopWhenTheViewCloses is a known unrelated flake and passes in isolation
golangci-lint run ./... — 0 issues
Manual pass: point a context at an unroutable server, drill into a resource type before discovery answers, confirm the list is not replaced when it fails

Every site that sets m.loading before firing discovery sets the level to LevelResourceTypes first, so the tighter guard drops no legitimate case and cannot leave a spinner stuck.

Supersedes #665, which GitHub closed when its base branch was deleted on merge. The CodeRabbit review there raised one finding about copying itemCache, declined with the mechanism in that thread: copyItemCache deep-copies at all three tab seams, so an in-place write cannot leak across tabs.

The fallback guarded only on m.loading, so a discovery request fired on context entry that failed after the user drilled into a resource type replaced the resource list with the seed resource types and cached them under the resource-level navKey. Guard on the level the way the success branch does, and key the cache with the context, as that branch does.

coderabbitai · 2026-08-21T09:16:37Z

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internal/app/discovery_failure_level_test.go

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Summary by CodeRabbit

Bug Fixes
- Improved handling when resource discovery fails.
- Resource views now preserve existing resource items and navigation position instead of replacing them or using incorrect cached results.
- Resource-type views display the appropriate fallback entries when discovery cannot be completed.
- Loading states now end correctly after a discovery failure, helping prevent stale or misleading content.

Walkthrough

When the view is at LevelResourceTypes and loading is active, discovery-error fallback updates the resource-type list. At deeper resource levels, the fallback preserves existing resource items and does not display resource-type seeds. The fallback sidebar uses m.nav.Context as its cache context. Tests use basePush80Model, avoid parallel execution, and verify the rendered entries for both navigation levels.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary fix to prevent discovery-error fallback from overwriting deeper resource levels.
Description check	✅ Passed	The description clearly explains the bug, fix, affected levels, tests, related issues, and one pending manual check, despite not using all template headings.

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Actionable comments posted: 1

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Inline comments:
In `@internal/app/discovery_failure_level_test.go`:
- Around line 16-73: Update both discovery-failure tests to construct their
models with basePush80Model() instead of baseModelCov(), and assert the rendered
stripANSI(view) output for the preserved resource list and resource-type seed
fallback at the required terminal width. Keep the existing behavioral checks for
cursor, cache, and loading state where relevant, while adding user-visible view
assertions.

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internal/app/update_resources_discovery.go

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Both tests built their model with baseModelCov() and asserted only on internal state, so a test that only checks middleItems does not prove the user stops seeing the resource-type sidebar in place of the resource list. Switch to basePush80Model() and add stripANSI(view) assertions per the project's TUI test convention. Dropped t.Parallel(): Model.View() writes the package-level ui.ActiveCollapsedCategories/ui.ActiveCategoryCounts render globals, so two Model.View() calls racing across parallel test goroutines trip -race (confirmed against the existing TestWatchTickAgeAdvancesOnMemoizedItems, which also renders View() under t.Parallel()).

janosmiko · 2026-08-21T10:04:42Z

Done, and it surfaced a real data race on the way.

Both tests now build with basePush80Model() and assert on stripANSI(View().Content), on top of the existing state checks rather than replacing them. The state assertions cover the half a user cannot see, namely the poisoned cache entry.

TestDiscoveryFailureAtResourceLevelLeavesMiddleColumnAlone asserts api-0, api-1 and api-2 are still rendered and that Deployments does NOT appear in the middle column.
TestDiscoveryFailureAtResourceTypesLevelSeedsAndCachesUnderContext asserts Deployments and ConfigMaps do appear, since that fallback is intentional.

The view assertions were mutation-checked rather than assumed: reverting handleAPIResourceDiscoveryError to the pre-fix guard and cache key in place made them fail exactly as expected, with the sidebar painted into the middle column. The file was then restored byte for byte, confirmed with git diff.

Unplanned finding. Adding a second View()-rendering test under t.Parallel() failed under -race, and it is a genuine production race, not a test artifact: Model.View() writes the package-level ui.ActiveCollapsedCategories and ui.ActiveCategoryCounts, so two View() calls from different Model instances on different goroutines collide. The trace pins it at a write in view.go:439 against a read in explorer.go:351, colliding with the existing TestWatchTickAgeAdvancesOnMemoizedItems, which also renders under t.Parallel().

Bubble Tea renders on one goroutine, so this is latent rather than live. Both tests dropped t.Parallel() with a comment naming the reason, which keeps this PR in scope. The underlying globals are tracked separately, in the same family as the cursor-less render invariant from #526 and #398.

janosmiko · 2026-08-21T10:05:23Z

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coderabbitai · 2026-08-21T10:05:28Z

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coderabbitai Bot reviewed Aug 21, 2026

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Comment thread internal/app/discovery_failure_level_test.go Resolved

janosmiko merged commit 9bd2ba9 into main Aug 21, 2026
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janosmiko mentioned this pull request Aug 21, 2026

chore(main): release 0.18.0 #648

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BrewTestBot mentioned this pull request Aug 21, 2026

lfk 0.18.0 Homebrew/homebrew-core#300021

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chenrui333 mentioned this pull request Aug 21, 2026

lfk 0.18.0 chenrui333/homebrew-tap#10422

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scottames-github-bot Bot mentioned this pull request Aug 26, 2026

chore(deps): update ⬆️ mise-packages scottames/dots#1029

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fix: keep the discovery-error fallback from clobbering a deeper level - #667

fix: keep the discovery-error fallback from clobbering a deeper level#667
janosmiko merged 2 commits into
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fix/guard-discovery-error-by-level

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janosmiko commented Aug 21, 2026

The bug

The fix

Where CodeRabbit had it

Test plan

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