fix(browser-db-sqlite-persistence): release OPFS workers on pagehide - #1844
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughChangesOPFS lifecycle and error reporting
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Page
participant OPFSDatabase
participant PendingRequests
participant Worker
Page->>OPFSDatabase: dispatch pagehide
OPFSDatabase->>PendingRequests: reject pending requests with AbortError
OPFSDatabase->>Worker: dispose and terminate worker
OPFSDatabase->>Page: remove pagehide listener
Merge Risk: 🟡 Moderate · up to A failed SQLite initialization can leave OPFS VFS resources unreleased. Address cleanup of the failed initialization attempt before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@packages/browser-db-sqlite-persistence/README.md`:
- Line 106: Update the README’s pagehide behavior documentation near the pending
initialization and query statement to also cover pending database.close()
requests, stating that all pending requests may reject with AbortError.
In `@packages/browser-db-sqlite-persistence/src/opfs-worker.ts`:
- Around line 171-177: Update the initializeWorkerDatabase error path around
opfsVfs and open_v2 to explicitly dispose the failed VFS before returning the
initialization failure response. Ensure disposal releases the temporary access
handles and navigator lock rather than relying on the inherited no-op close
method, while preserving the existing error propagation behavior.
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.changeset/fix-opfs-page-lifecycle.mdpackages/browser-db-sqlite-persistence/README.mdpackages/browser-db-sqlite-persistence/src/opfs-database.tspackages/browser-db-sqlite-persistence/src/opfs-worker.tspackages/browser-db-sqlite-persistence/src/wa-sqlite-examples.d.tspackages/browser-db-sqlite-persistence/tests/opfs-database.test.tspackages/browser-db-sqlite-persistence/tests/opfs-worker.test.ts
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# Conflicts: # docs/contributing/oracle-coverage.md
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Thanks for the nice PR! |
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I have some other persistence PRs in flight which should hopefully improve your experience as well. |
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openBrowserWASQLiteOPFSDatabase()now synchronously releases its dedicated worker when the page is hidden, including while initialization is pending. Pending calls reject predictably, stale worker responses cannot revive the connection, and startup diagnostics retain an available OPFS VFS cause.Root cause
The browser adapter owned a dedicated worker but only disposed it through explicit close and worker-error paths. A document entering
pagehideor the back/forward cache could therefore retain the worker and its native OPFS handles. Initialization was especially problematic because the caller did not yet have a database handle it could close.SQLite also reduced an
open_v2failure to its generic message even whenOPFSCoopSyncVFS.lastErrorcontained the useful native error name and path.Approach
pagehidehandler as soon as the worker request channel is created.AbortErrorbefore terminating the worker synchronously.The lifecycle oracle now covers pagehide before response production, after production but before delivery, and after delivery; mixed completed/pending siblings; forward and reverse response delivery; Worker
errorandmessageerror; late responses; closed next use; negative post-disposal worker reach; and all init/close response codes. The diagnostic oracle computes expected text from immutable scalar input before production receives anyErrorobject.Key invariants
pagehidehandler returns.AbortError.Non-goals
pageshow.Trade-offs
Synchronous termination is necessary because a cached document can freeze as soon as
pagehidereturns, but it cannot wait for asynchronous close or guarantee pending writes are durable. Applications should flush and explicitly close before navigation when possible. Onpageshowwithevent.persisted, they must recreate database, persistence, and collection instances or reload.The property suites keep fixed replayable seeds plus exhaustive examples for cheap structural products. They do not add a nondeterministic or stress lane because these state spaces are small and ordinary package CI is the permanent campaign.
Standalone reproduction
https://github.com/zhy0216/tanstack-opfs-repro
git clone https://github.com/zhy0216/tanstack-opfs-repro.git cd tanstack-opfs-repro bun install --frozen-lockfile bunx playwright install chromium bun run reproFor manual inspection, run
bun run start, open http://127.0.0.1:4173 in Chrome, and selectpagehide-initializingorpagehide-ready. The default harness uses published@tanstack/browser-db-sqlite-persistence@0.2.23; it has no application backend, framework, or collection setup.bun run reprointentionally succeeds when it observes the unfixed baseline symptoms.verify:fixedasserts the corrected behavior. The repository preserves baseline and combined-fix Chromium receipts. This oracle audit inspected but did not independently rerun those native receipts.The related VFS fix drains partial opens, bounds retries for native
NoModificationAllowedErrorcontention, closes late handles, and retains failure causes. This PR does not vendor it or change the wa-sqlite peer range. Because TanStack embeds the VFS in its generated worker, delivering that separate fix requires adopting a released/backported VFS and rebuilding the worker.Oracle transfer accounting
persisted=falseinit × before-production × falseAbortErrorpersisted=trueinit × before-production × trueAbortErrorclose × before-productionAbortErrorclose × response-before-pagehide[/locked.sqlite-wal]Verification
Exact verified revision:
e1e626918132105782a11895155fc599b1b119b1, based onf4de23c91bf43ec38c00a0c8d684d82a38d10a9d.Runtime: macOS arm64, Node
24.19.0, Vitest3.2.4, FastCheck3.23.2, TypeScript5.9.3.Unchanged final oracle files against the exact PR base production files:
PR head:
opfs-database.ts: 95.69% statement, 92.59% branch, and 100% function coverage; both Worker terminal handlers execute.git diff --check, the normal lint-staged commit gate, and the browser persistence production build pass.Fault-control receipts
Every killed mutant reached production and failed a semantic assertion. Reverse sibling completion is retained as an allowed control, not mislabeled as a defect.
1844, path0, before-response-production registration checkpointAbortError1845, path0, mixed-sibling settlement comparisonerrorrejection diagnostic1847, path0, terminal-event error comparisonmessageerrorrejection diagnostic1847, path1, terminal-event error comparisonErrorbefore formatting1846, path0, immutable-input diagnostic comparisonVerbose FastCheck output preserves the original counterexample sequence alongside the reduced counterexample and replay seed/path.
Replay controls are property-specific:
TANSTACK_DB_OPFS_LIFECYCLE_ORACLE_{SEED,RUNS,PATH}TANSTACK_DB_OPFS_MIXED_ORACLE_{SEED,RUNS,PATH}TANSTACK_DB_OPFS_TERMINAL_EVENT_ORACLE_{SEED,RUNS,PATH}TANSTACK_DB_OPFS_FAILURE_ORACLE_{SEED,RUNS,PATH}TANSTACK_DB_OPFS_DIAGNOSTIC_ORACLE_{SEED,RUNS,PATH}Commands run from the repository root unless noted:
The package's ordinary Vitest typecheck wrapper still emits unrelated monorepo cross-package
rootDirsource errors in this checkout; the widened-root standalone command above passes with no type errors.Files changed
src/opfs-database.ts: pagehide registration, pending-request rejection, and idempotent listener/worker disposal.src/opfs-worker.ts: conditional VFS-cause enrichment for open failures.tests/opfs-page-lifecycle-oracle.test.ts: generated lifecycle, mixed-sibling, terminal-event, settlement, reach, ownership, and cleanup model.tests/opfs-worker-diagnostics-oracle.test.ts: immutable-input generated worker-response diagnostic oracle.tests/opfs-database.test.ts: neutral page event fixture support for retained pre-existing tests.README.md: page lifecycle, durability, restoration, and diagnostic guidance.docs/contributing/oracle-coverage.md: oracle ownership and evidence limits..changeset/fix-opfs-page-lifecycle.md: patch release note.Release impact
Summary by CodeRabbit
Bug Fixes
AbortErrorduring page lifecycle transitions.Documentation