refactor: hold the drain queue head in one cell with a reason - #1850
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The drain held the queue head in three parallel cells, one for the account
quota, one for a settings refusal and one for a bin index the pass could not
read. All three carried the same head and were mutually exclusive, but nothing
made the exclusion structural: each halt arm cleared the other arms by hand.
One `QueueHold { op_id, node, reason }` replaces them, with the reason as
`Quota`, `Settings` or `BinIndex`. One pre-pass gate dispatches on the reason
and is the only place a hold lets go. The three public `SnapshotView` and
`SessionStatus` fields become `queue_hold`, the three wasm-bound classes become
one `QueueHold` that names its reason, and the client protocol carries one
discriminated union in place of three nullable fields.
The drain test harness also regains the two `OwnerRootSpec` fields that a
semantic merge conflict between two merged pull requests left off its owner-root
fixture, which broke the engine test build on main.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe change consolidates quota, settings, and bin-index holds into one reason-discriminated ChangesQueue hold consolidation
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Change: Refactor Merge Risk: ⚪ Minimal · up to The unified queue-hold representation is propagated through the engine, WASM, client, and web surfaces, with regression coverage for the previously identified placement re-probe behavior. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@crates/engine/src/sync/drain.rs`:
- Line 1908: Update the quota-held head flow around hold_admits_the_head and
quota_admits so an Err placement clears the existing quota hold before normal
placement classification proceeds. Preserve settings-hold creation for
deterministic refusals and retry behavior for unclassified placement errors, and
add regression coverage for both cases after an existing quota hold.
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📒 Files selected for processing (24)
apps/web/src/components/file-browser/FileBrowserActions.test.tsxapps/web/src/components/file-browser/QueueHoldNotice.test.tsxapps/web/src/components/file-browser/QueueHoldNotice.tsxapps/web/src/components/file-browser/UploadPanel.test.tsxapps/web/src/engine/introspection.tsapps/web/src/engine/snapshotStore.test.tsapps/web/src/engine/snapshotStore.tsapps/web/src/engine/testFakes.tsapps/web/src/vault/useFolderNavigation.test.tsxcrates/engine/src/facade.rscrates/engine/src/lib.rscrates/engine/src/sync/drain.rscrates/engine/src/sync/mod.rscrates/engine/tests/write_plane.rscrates/fuse/tests/fuse_op_core.rscrates/wasm/src/lib.rscrates/wasm/tests/boundary.rspackages/client/src/broadcastTransport.test.tspackages/client/src/index.tspackages/client/src/testkit.tspackages/client/src/worker/commandCodec.test.tspackages/client/src/worker/commandCodec.tspackages/client/src/worker/engineWasm.tspackages/client/src/worker/protocol.ts
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A head held over the account quota re-probes the quota on every tick, and a placement the session could not decide made that probe answer "no room" without ever asking. The member then read "over quota" while the cause was their own settings, and the label stood until the settings were fixed. The probe now separates the two placements it cannot use. A refusal of the member's own settings is a verdict, so the hold goes and the pass re-takes the hold its own rule names. An outage is not a verdict: the head stays held rather than running a pass that would spend the unattributed budget on a placement no pass can decide.
Review dispositionThe review body posted one actionable comment and no "Nitpick" or "Outside diff range" section. Every item is listed below.
Item 1The finding is right that a head held over the account quota keeps that hold under a placement the session cannot use, and that the member then reads "over quota" over a cause they cannot act on. The behaviour is not new in this pull request: the same early return stood in The proposed diff releases the hold for every The fix returns the settings refusal instead: a refusal of the member's own settings releases the hold, so the next pass re-takes the hold its own rule names, and an outage keeps the head held and spends no budget. No other review item was raised. |
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What
The drain held the queue head in three parallel cells — one for the account quota, one for a settings refusal, one for a bin index the pass could not read. The three carried the same head and were mutually exclusive, but nothing made the exclusion structural: each halt arm cleared the other arms by hand.
One
QueueHold { op_id, node, reason }now replaces them. The reason isQuota { needed_bytes },Settings(SettingsRefusal)orBinIndex(DefaultsReason).hold_admits_the_head, dispatches on the reason and is the only place a hold lets go. The quota probe becomesquota_admits(needed_bytes), which returns a verdict rather than clearing a cell.SnapshotView::queue_holdandSessionStatus::queue_holdreplace the three public fields.QueueHoldclass replaces three. It carriesreasonas a stable name,neededByteson a quota hold, andcheckon the two the host renders by name.packages/clientcarries oneQueueHoldDescriptordiscriminated union in place of three nullable fields. The codec still fails closed: it refuses a reason this build cannot name, a check outside that reason's own vocabulary, and a quota hold with no byte count.apps/webreads the one field: the queue hold notice dispatches on the reason, andheldBytesreads the quota reason alone.The host reads the same information it read before, through one field.
Drive-by build fix
The drain test harness regains the
writer_pseudonymandpointer_read_keyarguments of its owner-root fixture. #1836 added those required fields and #1842 added this call site; the two merged without a textual conflict and leftcargo check -p cipherbox-engine --all-targetsfailing onmain. The fix is two lines at one call site.Verification
cargo fmt --all --check,cargo clippy --workspace --all-targets -- -D warningscargo test -p cipherbox-engine,cargo test -p cipherbox-fuse,cargo test -p cipherbox-wasmcargo check -p cipherbox-wasm --target wasm32-unknown-unknownpnpm -r typecheck,pnpm lint,pnpm lint:tracker-refspackages/clientvitest: 718 tests.apps/webvitest: 694 tests.Body checks / follow-ups filed
mainafter fix: charge the drain unattributed halt and cover its unanchorable-root refusal #1842 — 14 clear calls indrain.rs, four of them inside the halt arms — and names the TypeScript surface the original body did not list.mainbuild, is fixed in this pull request.Closes #1665.
Summary by CodeRabbit
New Features
Bug Fixes
Note
Consolidate drain queue hold into one
QueueHoldwithQueueHoldReasonBlockedOp,SettingsHold,BinIndexHold) with a singleQueueHoldrecord carrying aQueueHoldReasondiscriminator across the Rust engine, WASM boundary, and TypeScript client protocol.SessionStatus,SnapshotView,Drainstruct, andEngineto use oneRefCell<Option<QueueHold>>slot instead of three fields. The WASM and clientSnapshotDescriptornow expose one nullablequeueHoldproperty.Drain::quota_admitsnow releases a quota hold when the current placement error is a settings refusal, letting the next pass classify it under the settings reason; undecided placement errors still keep the hold.heldBytesreturns required bytes only for a matching quotaqueueHold;introspection.settlednow treats non-quota holds as settled;QueueHoldNoticerenders notices only for settings and bin-index holds, not quota holds. The WASM API exposes onequeueHoldobject withneededBytes/checkconditionally present based on reason.Macroscope summarized a84b955.