fix(engine): cache what the write wave adopts before its floor moves by FSM1 · Pull Request #1914 · FSM1/cipher-box

FSM1 · 2026-09-19T09:53:33Z

Summary

The write wave adopted each interior record and raised the sequence floor of its name, but it did not write the bytes to the snapshot cache. After a write share (contact grant or invite link), the cache held a file at sequence 2 and the floor was 3. A read that found no record source opened the cached copy below the floor and failed with TrustViolation.

This change makes every path that writes the last-known-good record of a name use one helper, keep_newest_last_known_good (crates/engine/src/net/last_known_good.rs). Each path calls it before its floor moves. If the cache write fails, the floor does not move.

The helper reads the cached copy, compares the sequences, and writes the new bytes only when the cached copy is older. A cached copy at the same or a higher sequence stays.
The helper holds a per-name lock across the read, the compare and the write. Two passes for one name (tick, sweep, write wave, drain) cannot interleave these steps, so an older pass that finishes last cannot overwrite a newer last-known-good. The helper reads the cache again inside the lock. It does not use a value that a pass read before its network or gate awaits.
The drain builds its next record on the bytes that its own pass adopted. It does not read the cache back, because the cache can keep a newer copy that this pass did not gate.
The root rotation reads now put the bytes in the cache before the floor moves. Before this change, ScopeWalk::descend and resealable_root raised the floor first and then did a put that ignored errors, and the other owner root reads did no put. The child binding check (envelope id and ascent link) now runs before the floor commit and before the cache write.

Gate rejections stay trust violations

AGENTS.md security rule 6 says that a gate failure is a fail-closed trust violation and never staleness. An earlier revision of this PR changed a cached child record below its sequence floor to ContentUnavailable. That change is removed. Every gate rejection of a cached record is TrustViolation. The one exception is the ADR 0021 case (a lagging record whose epoch the ratchet of the scope root does not reach is unreachable), which this PR does not change.

The per-name lock

The lock map is a thread-local BTreeMap from the name to the parked wakers. The engine is !Send, so every pass of one engine runs on the thread that owns it. On wasm there is one thread.
The lock is an async lock: a pass that finds the name held parks and wakes when the holder drops the guard. The guard releases the name on drop, also when the future is cancelled.
The lock covers only the cache read and the cache write. It does not cover a network call, a gate stage or a floor commit, and no other lock is taken inside it, so it cannot deadlock with another lock.
No seam changes.

Foreign root `Current`

A root that resolves Current at the floor, from which the owner recovers no scope material (a foreign root), does not write the cache. This is correct: the pass did not open the record, so it has no gate pass to cache.

No seam, wire format or durable record kind changes. The snapshot cache still stores the raw signed record bytes, so the cache of the previous release decodes.

Cache write paths

Path	Result
`resolve_gated` adopt and own-root `Current`	Helper, before the floor commit.
`resolve_child` `Current` arm	Helper, after `open_at_floor` (the floor does not move).
`WriteWaveNet::interior_source`	Helper, before the sequence raise.
Owner sweep `open_interior_record`	Helper, before `advance_sequence_on_unseal`.
Owner root rotation reads (`descend`, `resealable_root`, sweep child scope root, promoted root, wave `root_source`, wave child-scope check, `gated_root_at`)	Helper, before the floor commit. A failed put raises no floor.
Vault-root walk (`ScopeWalk::descendant_scope_roots`)	No put. The caller holds the vault root bytes that the resolve driver already cached.
Grantee root read (`GranteeRotationNet`)	Put before the floor commit (`gated_root_cached`). If the put fails, the floor does not move.
Re-gate of a cached root (`last_known_good_root`)	No put. The bytes come from the cache.
Drain self-adopt after a publish	Helper, before the commit.
Settings, bin index and defaults planes	Unchanged. They cache a head block under a different key, not the record of a name.

Tests

Race: an_older_pass_that_finishes_last_keeps_the_newer_copy (net/last_known_good.rs). The older pass reads the cache and parks; the newer pass runs; the older pass finishes last. The cache keeps sequence 7.
Drain: an_adopt_authors_on_the_bytes_it_gated_not_the_cache.
Root reads: a_scope_root_read_caches_the_root_before_it_raises_its_floor, a_grantee_root_read_caches_the_root_before_it_raises_its_floor.
Child: a_cached_record_below_the_sequence_floor_is_a_trust_verdict_offline, a_transplanted_cached_record_stays_a_trust_verdict_offline, a_current_record_replaces_an_older_cached_copy.
Wave: the_wave_caches_an_interior_record_before_it_raises_its_floor, the_wave_keeps_a_newer_cached_interior_record.
Sweep: an_interior_unseal_advances_the_names_sequence_floor (extended), an_interior_read_keeps_a_newer_cached_record, an_interior_read_the_cache_refuses_raises_no_floor.
Resolve: an_own_current_root_replaces_an_older_cached_copy_and_a_foreign_one_does_not, an_adopt_keeps_a_newer_cached_copy, an_own_current_root_keeps_a_newer_cached_copy.
End to end (crates/engine/tests/mount_convergence.rs): a_write_share_leaves_every_record_it_touches_cached_at_its_sequence_floor and a_file_under_a_write_share_reads_with_every_record_endpoint_down.
the_on_access_file_queue_stops_admitting_past_its_ceiling now counts the distinct names that a pass reads. The helper reads the cache of a name one more time, so a count of all reads doubled.

Mutation checks: without the lock, the race test fails. If the drain reads the cache back, the drain test fails. If the root read caches after the commit, the root read test fails. If the grantee root read uses the uncached gate, the grantee root read test fails. If the offline below-floor read maps to unavailable, the child test fails.

Body checks / follow-ups filed

A comment on fix(engine): a write wave raises a file's sequence floor but leaves the cached record behind #1913 corrects the "Done when" item that asked for ContentUnavailable.
No new issues.

Closes #1913.

Summary by CodeRabbit

New Features
- Improved recovery when record endpoints are unavailable, keeping cached shared folders and files readable.
- Added safer synchronization that preserves the newest cached records.
- Improved handling of records re-served at their current sequence floor.
Bug Fixes
- Prevented older records from replacing newer cached copies.
- Cached verified records before advancing sequence floors during writes and rotations.
- Ensured adopted records use the data authenticated during adoption.
- Strengthened offline validation for stale or transplanted cached records.

coderabbitai · 2026-09-19T09:53:39Z

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crates/engine/src/net/rotation.rs
crates/engine/src/sync/drain.rs

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crates/engine/src/sync/drain.rs

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Walkthrough

The change adds sequence-aware last-known-good cache writes, orders cache updates before floor commits, refactors root gating around deferred adoption, and updates resolve, drain, write-wave, and convergence tests.

Changes

Cache and floor alignment

Layer / File(s)	Summary
Last-known-good cache policy `crates/engine/src/net/last_known_good.rs`, `crates/engine/src/net/mod.rs`	Adds verified sequence checks, per-name async locking, and newest-record write behavior.
Root gating and deferred adoption `crates/engine/src/net/adopter.rs`, `crates/engine/src/net/rotation.rs`, `crates/engine/src/net/author.rs`, `crates/engine/src/rotation/reseal/tests.rs`	Replaces separate root helpers with `gate_root_pass`, separates pending adoption from commitment, and updates gate references.
Write-wave cache-before-floor ordering `crates/engine/src/net/rotation.rs`, `crates/engine/src/net/cut.rs`	Passes the snapshot cache into write-wave components and caches root and interior records before floor changes.
Resolve, drain, and offline-read integration `crates/engine/src/net/child.rs`, `crates/engine/src/net/resolve.rs`, `crates/engine/src/sync/drain.rs`, `crates/engine/tests/mount_convergence.rs`, `crates/engine/tests/write_plane.rs`	Updates current-record write-back, returns gated adoption bytes directly, preserves newer cached records, and adds offline convergence coverage.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant WriteWaveNet
  participant keep_newest_last_known_good
  participant SnapshotCache
  participant FloorStore
  participant OfflineRead
  WriteWaveNet->>keep_newest_last_known_good: verified adopted record
  keep_newest_last_known_good->>SnapshotCache: write if newer
  WriteWaveNet->>FloorStore: advance sequence floor
  OfflineRead->>SnapshotCache: read last-known-good record
  SnapshotCache-->>OfflineRead: record at or above floor

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Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 79.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 44 functions across 10 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

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Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: caching records adopted by the write wave before advancing the sequence floor.
Linked Issues check	✅ Passed	Issue `#1913` coding requirements are met. `WriteWaveNet` and root rotation paths cache gate-passing bytes before floor commits. `resolve_gated` uses `keep_newest_last_known_good` for adopted records an…
Out of Scope Changes check	✅ Passed	The changed production code supports issue `#1913` by ordering cache writes before floor changes, preserving newer cached records, validating root and child bindings, and preventing stale cache reads in…

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FSM1 · 2026-09-19T11:13:29Z

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coderabbitai · 2026-09-19T11:13:33Z

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greptile-apps · 2026-09-19T11:27:08Z

Confidence Score: 5/5

The PR appears safe to merge; no actionable new defect or outstanding previous finding remains.

Summary

This PR ensures gate-passing record bytes become last-known-good before their sequence floors advance, while preventing concurrent or older passes from regressing the cache.

Centralizes sequence-aware snapshot replacement in keep_newest_last_known_good.
Serializes each name’s cache read, comparison, and write.
Applies cache-before-floor ordering across resolve, child, rotation, sweep, write-wave, and drain paths.
Defers root floor commits until child binding checks and cache writes succeed.
Adds regression coverage for cache races, stale copies, write failures, offline reads, and grantee root reads.

Diagram

sequenceDiagram
    participant Pass as Gate-passing read
    participant Lock as Per-name lock
    participant Cache as Snapshot cache
    participant Floor as Sequence floor
    Pass->>Lock: acquire(name)
    Lock-->>Pass: exclusive guard
    Pass->>Cache: read current bytes
    Pass->>Pass: verify and compare sequences
    alt candidate is newer
        Pass->>Cache: write candidate bytes
    else cache is same or newer
        Pass->>Pass: retain cached bytes
    end
    Pass->>Lock: release
    Pass->>Floor: commit/advance floor

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The write wave adopted each interior record and raised its sequence floor without writing the bytes to the snapshot cache. After a write share the cache held the file at sequence 2 under a floor of 3, so a read that found no record source opened the stale copy and failed with TrustViolation. - WriteWaveNet carries the snapshot cache and puts the adopted bytes before it commits the raise; a failed put leaves the floor unspent. - The owner sweep's interior read does the same before its raise. - A record re-read at the floor replaces an older cached copy: the owner root arm of resolve_gated and the Current arm of resolve_child. - A cached child record below its sequence floor that the network cannot replace is ContentUnavailable, not TrustViolation.

…int down The owner shares a folder with write permission, by contact grant and by invite link. Then every record endpoint fails. The head content, the version list, and the prior version must read from the last-known-good that the write wave cached. The write-share fixture now reuses the two-version file helper.

A pass that caches a record but fails its floor commit leaves the floor below the cached copy. A later, older record then passes the gate above that floor. The sweep's interior read, the write wave's interior read and the resolve driver's adopt replaced the newer cached copy with it. Every cache write on a gate pass now goes through one sequence-aware rule: the bytes replace the cached copy only when that copy is older. A nocache pass reads the cached copy for this check. The floor still moves only to the sequence the pass read, and only after the cache write.

…rejections trust verdicts Every path that caches the record of a name now goes through one helper that holds a per-name lock across the cache read, the sequence compare and the put, and runs before the floor moves. Root rotation reads cache before the floor commit and check the child binding first. The drain authors on the bytes its own pass adopted. A cached record below the sequence floor stays a trust violation.

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FSM1 · 2026-09-19T14:16:53Z

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Inline comments:
In `@crates/engine/src/net/rotation.rs`:
- Line 2416: Add a SnapshotCache generic parameter and field to
GranteeRotationNet, initialize and propagate it through the relevant
constructors or call sites, and replace the uncached gated_root call with
gated_root_cached. Mirror the cache wiring used by OwnerRotationNet and
WriteWaveNet so the grantee record is cached before RootAdopter::commit_root
advances the floor.

In `@crates/engine/src/sync/drain.rs`:
- Around line 2298-2307: Update the docstring above resolve_scope_root to
describe that gate-passing adopts and recoverable own-root Current results may
update the cache, while foreign or unrecoverable Current results,
TrustViolation, and NoUpdate leave it unchanged; retain the note that roots
published through other paths may remain stale until a later resolve refresh.

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crates/engine/src/net/adopter.rs
crates/engine/src/net/author.rs
crates/engine/src/net/child.rs
crates/engine/src/net/cut.rs
crates/engine/src/net/last_known_good.rs
crates/engine/src/net/mod.rs
crates/engine/src/net/resolve.rs
crates/engine/src/net/rotation.rs
crates/engine/src/rotation/reseal/tests.rs
crates/engine/src/sync/drain.rs
crates/engine/tests/mount_convergence.rs
crates/engine/tests/write_plane.rs

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GranteeRotationNet takes the snapshot cache and gates its scope-root read through gated_root_cached, so a grantee rotation leaves the root as last-known-good before the sequence floor advances, and a refused cache write raises no floor. The resolve_scope_root doc names the resolve paths that write the cache.

FSM1 · 2026-09-19T15:43:19Z

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… restore (#1917) Part of #1911. This change also lets a write grantee restore a prior version of a file below a proved grafted write root. The owner decision for this is #1886 (comment): a version restore publishes a new head from a prior version and deletes no version, the same as an edit. Bin restore, purge, prune and version delete stay refused. ## Part 1: the idle sweep job ### Problem `blueprint/engine.md` "sweep" says that the sweep runs as an idle-cadence Scheduler job. `run_sweep_job` had no production caller. The only sweep was the task that a cut enqueues, capped at three passes. A sweep that failed, or a restart after a cut, left interior nodes at the old epoch until a write reached them. ### Change - `Engine::start` spawns the idle sweep job (`spawn_sweep_job` in `crates/engine/src/facade.rs`). Each `sweep_cadence` it runs one pass over each due scope. - A scope is due when all of these are true: - This vault owns it: the vault root at its held name, or a scope root that the own-vault boundary walk proved (`walked_read_epochs`). A grafted scope is never a target. - Its known read epoch is above `GENESIS_EPOCH`. For the vault root the epoch comes from the durable epoch floor. For a nested scope it comes from the walk. - No pass of this session confirmed it converged at that epoch. - Nothing new is durable. The pending state comes from state the engine already holds: after a restart every scope past its genesis epoch is due one time, and the pass computes the work-list from published records, as before. - One `Sweeper` builds the owner rotation net for both the cut task (three passes) and the idle job (one pass per round). `run_sweep_job` in `crates/engine/src/rotation/sweep.rs` now takes the per-scope sweep as a closure, because each scope needs its own ascent authority. - A write grantee does not run the sweep. `blueprint/engine.md` says that the sweep is "Runnable by any write-capable client", but this change wires the job only for the scopes that the owner's own vault holds. A write grantee's session runs the job only over the scopes of its own vault, never over a grafted scope. - The idle job reports each result through `SweepRun`: `Swept(result)`, or `SessionEnded` when the session keys are gone. The job then stops. - The lagging read arm (ADR 0021) is not in this change. #1911 stays open for it. ### Tests In `crates/engine/tests/mount_convergence.rs`, new section "The lazy wave a cut leaves behind": - `the_sweep_a_cut_enqueues_re_seals_the_folder_it_left_behind`: the test drives the tasks that `RotateNow` spawned, with no clock advance, and the folder is re-sealed at the new epoch. - `after_a_restart_the_idle_sweep_converges_what_a_failed_sweep_left`: the cut's own sweep fails (all endpoints fail), the device restarts, and the idle job converges the lagging folder with no write to it. - `a_read_only_member_never_runs_the_wave`: a read grantee runs three sweep cadences after the owner's cut and no record on any endpoint changes. The owner's idle job then re-seals the folder. The restart test and the read-only test fail when the job is not spawned. `crates/engine/tests/facade.rs` and the facade loop test now count the job among the tasks that `start` spawns, and check that it stops when the engine drops. ## Part 2: version restore below a proved grafted write root ### Verdict: admitted `Command::RestoreVersion` journals `OpKind::RestoreVersion`. The drain arm `publish_restore_version` (`crates/engine/src/sync/drain.rs`) rotates the named version to the head of the file's own `versions` list and republishes the file record. It keeps every version, prunes nothing, and calls no vault surface: no bin index, no retire ledger, no doomed-name journal. So it is a write like a new version, and it is not a bin restore. The facade now admits it for a proved write pass. `DeleteVersion`, `Restore`, and `Purge` stay refused. ### Tests - Facade (`WriteGrantee` harness, real facade and real drain): `a_write_grantee_authors_every_admitted_write_inside_the_granted_scope` restores the first version and checks the head and the prior list. The version restore case moved out of `a_write_grantee_is_refused_what_leaves_the_scope_or_reaches_the_owners_surfaces`. - Two engines: `a_write_grantees_version_restore_reaches_the_owner` in `crates/engine/tests/mount_convergence.rs`. The write grantee restores the prior version of a file that the owner wrote. The owner reads the restored content as the head and the outgoing head as the prior version. - Both tests fail when the refusal comes back. ### Web `DetailsDialog`, `FileDetails` and `VersionHistory` take one required prop, `access: ScopeAccess` (`'owner' | 'write-grant' | 'read-only'`), in place of two booleans. `offers(access, command)` is the one rule for which version write each access shows: `owner` shows restore and delete, `write-grant` shows restore only, `read-only` shows neither. `DetailsDialog` also closes an open confirmation when the new access does not offer its command. Tests in `versions.test.tsx`: - `offers a restore and no delete in a share granted for writing`. - `retires a delete confirmation and keeps a restore one when the access drops to a write grant`. ## Shared file `crates/engine/tests/mount_convergence.rs` is also changed by #1914 (lane G20). This change adds its tests in the middle of the file, before the section "A write staged across a cut", and does not change any function that #1914 changes. A move of the new tests to a separate file needs a shared helper module for about 15 helpers of that file, so they stay in it. ## Local runs `cargo fmt --all --check`, `cargo clippy --workspace --all-targets -- -D warnings`, `cargo clippy -p cipherbox-engine -p cipherbox-wasm --target wasm32-unknown-unknown -- -D warnings`, `cargo test -p cipherbox-engine` (all pass), `pnpm -r typecheck`, `pnpm lint`, `pnpm lint:tracker-refs`, and the `apps/web` vitest suite (763 tests). ## Reviews run before the draft - Inline simplify, security and crypto-privacy passes. No new primitive, KDF edge, wire field or durable record. - CodeRabbit CLI (`--agent --base-commit`): 1 minor finding. The test snapshot read only the first endpoint. Fixed: it now reads every endpoint. - After the /code-review findings: inline simplify and code-review (Standards and Spec) passes, then CodeRabbit CLI (`--agent --base-commit`) with 0 findings. ## Body checks / follow-ups filed - #1916: comment #1916 (comment). The idle job's vault-root path (epoch from the durable floor after a restart) has no restart test. The fix for #1916 must add that case. - #1916 (new, `post-cutover`, `comp:engine`, child of #1702): a read cut of the vault root does not publish a new vault-pointer re-point, so the next cold start on the same device fails with a read-epoch floor regression. Found while writing the restart test. The restart test cuts a nested scope for this reason.    > [!NOTE] > ### Run sweep as an idle background job and allow version restore from grafted write scopes > - Adds an idle sweep job spawned at session start that periodically discovers owned scope targets and runs one sweep pass per due target, recording convergence until a newer epoch makes the target due again ([crates/engine/src/facade.rs](https://github.com/FSM1/cipher-box/pull/1917/files#diff-76615117c8cac0cf4673ee8bdad7503af14a9f6988afc51f66d3f31b82325238)) > - Generalizes the `Sweeper` and `run_sweep_job` to accept a per-invocation pass cap and per-target sweep callback, returning `SweepRun` to distinguish a completed sweep from `SessionEnded` ([crates/engine/src/rotation/sweep.rs](https://github.com/FSM1/cipher-box/pull/1917/files#diff-279b0c78488fd12f5b7c481a78e4bde585a3958554caf3ec373b0ce0f1de7f36)) > - Removes the graft refusal from the `RestoreVersion` command path so a proved write grantee can stage a version restore; `DeleteVersion` remains graft-refused > - Replaces the boolean `writable` prop with a three-way `ScopeAccess` classification (owner, write-grant, read-only) across `DetailsDialog`, `FileDetails`, and `VersionHistory`, making version restore available to owners and write grantees while delete stays owner-only > - Pending confirmations in `DetailsDialog` are now retired command-specifically when access drops below the required level > - Behavioral Change: session startup now spawns three background tasks (liveness, resolve-tick, idle sweep) instead of two; the idle sweep job runs at sweep cadence and exits on `SessionEnded`. Write grantees can now restore versions, authoring a new version position without rewinding history > >  > > <sup><a href="https://app.macroscope.com">Macroscope</a> summarized e1477c5.</sup> >  >   ## Summary by CodeRabbit - **New Features** - Added more precise sharing permissions for file version actions. - Users with write access can restore earlier versions, while deleting versions remains owner-only. - Read-only users can continue viewing file details and version history. - Background synchronization now continues after changes and can recover when devices reconnect. - **Documentation** - Updated shared-scope guidance to clarify unavailable owner-only sharing and version-deletion actions. - **Bug Fixes** - Version restores now correctly update the current file and preserve the previous version in history.

FSM1 marked this pull request as ready for review September 19, 2026 11:24

FSM1 mentioned this pull request Sep 19, 2026

fix(engine): run the sweep as an idle job and admit a grafted version restore #1917

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FSM1 added 4 commits September 19, 2026 14:46

FSM1 force-pushed the fix/1913-wave-caches-what-it-adopts branch from 01c254c to e43e534 Compare September 19, 2026 12:48

FSM1 mentioned this pull request Sep 19, 2026

fix(engine): a write wave raises a file's sequence floor but leaves the cached record behind #1913

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FSM1 merged commit 8d449b3 into main Sep 19, 2026
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FSM1 deleted the fix/1913-wave-caches-what-it-adopts branch September 19, 2026 15:52

cipherbox-release-bot Bot mentioned this pull request Sep 19, 2026

chore: release v2.4.0 #1908

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FSM1 commented Sep 19, 2026 • edited by coderabbitai Bot Loading Uh oh! There was an error while loading. Please reload this page.

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Summary

Gate rejections stay trust violations

The per-name lock

Foreign root Current

Cache write paths

Tests

Body checks / follow-ups filed

Summary by CodeRabbit

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FSM1 commented Sep 19, 2026

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Confidence Score: 5/5

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FSM1 commented Sep 19, 2026

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FSM1 commented Sep 19, 2026

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FSM1 commented Sep 19, 2026 •

edited by coderabbitai Bot

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Foreign root `Current`

coderabbitai Bot commented Sep 19, 2026 •

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