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fix(web): prevent microtask starvation and page freeze on logs page (#454) - #459
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…ub standard CONTRIBUTING.md
…454) - Share in-flight loadOlder Promise across concurrent callers (mount, scroll, loadAll, search) - Bind loadOlder to _contextSeq to prevent stale responses after category switch or reload - Terminate loadAll and search loops when no progress is made - Add synchronous onMount cleanup and store.dispose() method in Logs.svelte - Add Vitest store regression tests for concurrent loaders, stale category, and loop termination - Add Playwright browser regression test for responsiveness during delayed older page load - Update CHANGELOG.md under [Unreleased] Fixes #454
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📝 Walkthrough
Merge Risk: 🔵 Low · up to A temporary network failure can end a search before older matches are checked, leaving the Logs page showing “No logs.” This is a bounded issue to fix or explicitly accept before merging. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
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| Out of Scope Changes check |  |
The pull request deletes CONTRIBUTIONS.md, a repository-wide contribution and governance document. This change has no concrete connection to the Logs page freeze or issue #454. The other reviewed ch… |
Restore CONTRIBUTIONS.md in this pull request. Submit its removal separately with a relevant objective and review scope. |
| Docstring Coverage | |
Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 3 files. (2 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (3 passed)
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Check name Status Explanation Title check The title clearly identifies the web fix for microtask starvation and the resulting Logs page freeze. Description check The description is complete and well aligned with the template. It explains the issue, changes, affected area, related issue, testing, documentation, and checklist status. The security scan remains un… Linked Issues check Issue #454requires the Logs page to load and display entries without freezing.web/src/lib/unifiedlog.svelte.jsnow shares in-flightloadOlder()work, discards stale context responses, and stops …
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Full details: Out of Scope Changes check
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Explanation
The pull request deletes
CONTRIBUTIONS.md, a repository-wide contribution and governance document. This change has no concrete connection to the Logs page freeze or issue#454. The other reviewed changes support the linked bug fix or its tests and changelog entry.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 42.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 3 files. (2 skipped: 2 unsupported.)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @web/src/lib/unifiedlog.svelte.js:
- Around line 146-148: Distinguish request failures from empty or non-advancing
pages in loadOlder by returning a failure outcome from its catch path. In the
background search loop, retry failures with a bounded attempt count and delay,
reset the count after progress, and keep stopping on no progress; make loadAll
handle the failure outcome without continuing indefinitely.
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📒 Files selected for processing (6)
CHANGELOG.mdCONTRIBUTIONS.mdtests/logs.spec.tsweb/src/lib/unifiedlog.svelte.jsweb/src/lib/unifiedlog.test.jsweb/src/pages/Logs.svelte
💤 Files with no reviewable changes (1)
- CONTRIBUTIONS.md
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Pull Request
Description
Fixes browser tab freezing and indefinite "Loading logs…" spinner on the Logs page caused by microtask starvation during concurrent history loading (
loadOlderrace between viewport fill, unawaited scroll checks,loadAll, and search). Busy callers now share the active in-flightloadOlderPromise, older loads are bound to the store context sequence to discard stale responses across category switches/resets, and background loops end when no progress is made. Also adds a synchronousonMountcleanup andstore.dispose()method to abort pending work when navigating away from the page.Type of Change
fix: Bug fix (non-breaking change which fixes an issue)feat: New feature (non-breaking change which adds functionality)refactor: Code refactoring without behavioral changesperf: Performance improvementdocs: Documentation updates or additionstest: Test suite additions or improvementschore: Build, CI, dependencies, or tooling changesPre-Submission Governance
make testlocally and all backend tests passmake pre-commit-run(lint + security checks) locally and it passesRelated Issues
Fixes #454
Area & Target
area: api/area: mcp/area: replicationarea: engine/area: runnerarea: storage/area: safepatharea: db/area: anomalyarea: schedulerarea: web(Svelte UI)area: plugin(Unraid integration / PHP / packaging)area: infra/area: docstarget: containers(Docker)target: vms(Libvirt/KVM)target: folders(Flash / Filesystems)target: plugins(Unraid Plugins)target: flash(Unraid USB Flash)Changes Made
web/src/lib/unifiedlog.svelte.js:loadOlder()in_olderPromiseso concurrent callers await the shared in-flight load instead of spinning on immediate busy-returns._contextSeqto discard superseded responses without modifying store state.'advanced','no-progress','superseded') to terminateloadAll()andsetSearchFilter()loops when the cursor does not advance or silent failures occur.dispose()method that increments sequence tokens and aborts background work.web/src/pages/Logs.svelte:onMountcallback to synchronous to ensure Svelte registers the returned cleanup handler.destroyedguard and teardown cleanup that unsubscribes from WebSocket, clears poll timer, and callsstore.dispose().web/src/lib/unifiedlog.test.js:loadAll()andsetSearchFilter().dispose()sequence invalidation.tests/logs.spec.ts:CHANGELOG.md:## [Unreleased].Security & Sensitive Operations
internal/safepathTesting Performed
go test ./internal/...)make test)make lint,gofmt,goimports)make security-check)npm --prefix web test) (ifweb/touched)npm --prefix web run lint,npm --prefix web run build) (ifweb/touched)make pre-commit-run)Test Results
Documentation
docs/Breaking Changes
None.
Checklist
feat(ui): ...,fix(engine): ...,docs: ...)CGO_ENABLED=0) with SQLite WAL mode and connection pragmas respectedSummary by CodeRabbit