fix(auth): drop both current-user caches on sign-out (#5758) - #5822
fix(auth): drop both current-user caches on sign-out (#5758)#5822ntdatt812 wants to merge 5 commits into
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`clear_session` — the canonical sign-out path — removed the auth profile, tore down the socket, cleared `active_user.toml`, stopped login-gated services and rebound the process globals, but left both current-user caches populated. Both are keyed on `(api_base, token)`, so signing out and back in with the same JWT inside their windows replays pre-logout state: the old `/auth/me` snapshot for the rest of CURRENT_USER_REFRESH_TTL, and the old availability error for up to the 60s backoff ceiling. The intent was already written down. `clear_current_user_failure`'s own doc comment says it is "called on every success and on sign-out. Missing either one is the failure mode that matters here" — sign-out was the missing one. The two statics are private to `desktop::app_state::ops`, so the pair now has one public entry point, `forget_current_user_caches()`, and the existing invalidation site in `clear_deferred_session_after_backend_rejection` routes through it too, keeping a single writer. Tests: two cases pinning that the helper clears each cache. Getting them right mattered more than writing them. My first version took only `APP_STATE_CACHE_TEST_LOCK`, but the failure cache is serialised by a separate `CURRENT_USER_FAILURE_TEST_LOCK`, so the new test wiped a sibling's seeded state mid-run and turned `fetch_current_user_cached_replays_a_recorded_failure_without_calling_the_backend` red. Since `forget_current_user_caches` touches both globals, both cases now hold both locks, in a consistent order. `cargo test --lib app_state` 44 passed; `--lib security::credentials` 183 passed. `cargo fmt --all` clean.
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change clears both current-user caches during logout. A generation counter prevents in-flight refreshes from restoring cache state or failure records after sign-out. Tests cover stale and current-generation refresh outcomes. ChangesCurrent-user cache invalidation
Estimated code review effort: 4 (Complex) | ~40 minutes Merge Risk: ⚪ Minimal · up to This is a localized sign-out cache-invalidation change with relevant tests passing, and no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant clear_session
participant forget_current_user_caches
participant fetch_current_user_cached
participant auth_me
clear_session->>forget_current_user_caches: clear caches and bump generation
fetch_current_user_cached->>auth_me: start /auth/me request
auth_me-->>fetch_current_user_cached: return response
fetch_current_user_cached->>fetch_current_user_cached: compare captured generation
fetch_current_user_cached-->>fetch_current_user_cached: publish only if generation is current
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Warning Your free Security trial is over. An organization admin can activate Security or dismiss this notice. Comment |
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| // the same JWT inside their windows would replay pre-logout state (#5758). | ||
| // `clear_current_user_failure`'s own docs already name sign-out as one of | ||
| // its two callers; this is that caller. | ||
| crate::openhuman::desktop::app_state::forget_current_user_caches(); |
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When an app_state_snapshot request is already awaiting /auth/me during sign-out, this call only clears the caches momentarily; that request can subsequently complete and write the old user into CURRENT_USER_CACHE or record a failure in CURRENT_USER_FAILURE. The frontend's request-id invalidation does not cancel the core-side RPC, and peek_cached_current_user_identity ignores the positive-cache TTL, so the signed-out process or a fast account switch can continue exposing the previous identity, while a same-JWT login can replay the old failure. Add an invalidation generation/session guard so fetches started before logout cannot publish after this point.
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Inline comments:
In `@src/openhuman/desktop/app_state/ops.rs`:
- Around line 252-255: Update forget_current_user_caches and the refresh flow
used by fetch_current_user_cached so any in-flight refresh started before logout
cannot publish CURRENT_USER_FAILURE or CURRENT_USER_CACHE afterward; use a
generation check or equivalent serialization/cancellation mechanism. Add a
deterministic delayed-refresh test verifying both caches remain empty after
logout.
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…aches Clearing the two statics is not enough on its own. fetch_current_user_cached awaits the network between reading the caches and writing them, so a refresh already in flight when sign-out lands writes the pre-logout answer back afterwards - restoring precisely the state sign-out just dropped, and reopening the replay this fix exists to close. forget_current_user_caches now bumps a generation counter. The refresh reads it before the await and publishes only if it is unchanged; the caller still receives its answer, since it asked before the sign-out. Both directions are guarded: the success path would otherwise republish the snapshot, and the failure path would record an outage the next session never saw. Counting rather than flagging, so two overlapping sign-outs cannot cancel each other out. The tests synchronise structurally rather than on time: a loopback backend accepts the connection and holds it, so the request is provably in flight when sign-out runs, and the response is released only afterwards. Both go red against the previous commit.
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Verified against the code and it's a real race, not a theoretical one. Fixed in
let fetched = fetch_current_user(config, token).await; // ← sign-out can land here
clear_current_user_failure();
*cache = Some(CachedCurrentUser { ... }); // ← republishes pre-logout stateSo a refresh already in flight when sign-out lands writes the pre-logout answer back afterwards — restoring exactly what this PR removes, and reopening the replay it exists to close. The failure path has the same shape: The fix
The tests are deterministic, not timedThis was the part worth getting right. A in_flight.await.expect("backend saw the request");
forget_current_user_caches(); // the user signs out mid-request
let _ = release.send(()); // only now does the backend answerThe response uses Both go red against the previous commit, with the messages naming the harm:
Two housekeeping notesPushed with
Flagging it rather than letting it pass unmentioned. Happy to open a separate issue for the Windows pre-push lane if that's useful. I closed #5774, which was a duplicate of this PR that I opened two days earlier and didn't spot. This one is the tighter version and the one to review. |
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Inline comments:
In `@src/openhuman/desktop/app_state/ops.rs`:
- Around line 923-938: The current_user refresh must serialize generation
validation with each mutation of CURRENT_USER_FAILURE and CURRENT_USER_CACHE,
preventing sign-out from being overwritten after still_signed_in() succeeds.
Update record_current_user_failure and the successful cache-write path around
fetch_current_user to validate the generation while holding the corresponding
cache lock, or use one shared state lock for generation and both records. Add a
deterministic test that pauses the refresh after its final validation and
verifies sign-out remains authoritative.
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…ach record The generation check sat before both locks, which is a check-then-act: a sign-out landing between the check and the write would be overwritten by the very refresh this guard exists to stop. Move each check under the lock that guards the record it gates, and bump the generation before sign-out takes either lock. A writer holding a lock then either observes the bump and stands down, or read the generation before it -- in which case its write completed and released the lock before sign-out's clear could acquire it, so the clear lands second and wins. The snapshot timeout path took the same window through a second door: a sign-out during AUTH_FETCH_TIMEOUT left note_current_user_timeout recording an outage against an identity that no longer existed.
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Right, and it's the same class of bug one level down. Fixed in My guard was a check-then-act: The fixEach check now happens under the lock that guards the record it gates, and sign-out bumps the generation before it acquires either lock. That ordering is what makes the check sufficient — a writer holding a lock is in exactly one of two states:
There is no interleaving that leaves pre-logout state behind. I put that argument in the doc comment on Shape: Same window, second doorWhile checking this I found the snapshot timeout path had it too. What the tests do and don't proveThree new ones, all deterministic — no sleeps:
Being straight about the limit: these do not distinguish check-before-lock from check-under-lock. In all three the sign-out completes before the call, so either shape stands down. They are regression guards against the check being hoisted back out of the primitive, not a demonstration of the race. Reproducing the true interleaving needs the writer paused while blocked on the mutex, which isn't observable from outside without a test hook, and the only way to fake it is a sleep — which would be a flake generator and would pass with or without the fix. So the load-bearing evidence here is the ordering argument above, not a red-to-green test, and I'd rather say that than dress up a test that proves less than it looks like it does. The two await-crossing race tests from the previous round still pass. Pushed with |
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Inline comments:
In `@src/openhuman/desktop/app_state/ops.rs`:
- Around line 1019-1035: Capture the generation before load_app_session_profile
begins, then pass that captured value through fetch_current_user_cached and use
it for timeout failure recording, ensuring stale checks reject results after
sign-out. Add a deterministic test covering sign-out between profile loading and
refresh start.
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The refresh read the generation itself, after the snapshot had already loaded the session token. A sign-out landing in that gap was therefore counted before the refresh started: it compared the new generation against itself, passed, and published an answer it had fetched with the token from before the sign-out. load_app_session_profile busy-waits up to ~35s on a contended lock, so the gap is not a narrow one. snapshot now reads the generation immediately before the profile load and threads it through fetch_current_user_cached and the timeout path, so the generation and the token it belongs to are always read together.
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Correct, and it is the same defect a level further out each round: first the check was outside the lock, then the read was outside the token load. Fixed in The generation only means anything if it is read with the thing it is guarding. It was guarding the token, and it was being read after The gap is not narrow: The fix
I also corrected the doc comment on The testDeterministic, no sleep — the sign-out is expressed by call order: // The snapshot reads the token, and the generation alongside it.
let generation = current_user_generation();
// The user signs out while the auth profile lock is still being waited on.
forget_current_user_caches();
// Only now does the refresh start, still carrying the pre-sign-out token.
fetch_current_user_cached(&config, "jwt-before-logout", true, generation).awaitUnlike the three unit tests from the previous round, this one does distinguish the two shapes, and I want to be clear about why, having been careful to say the earlier ones did not: with the old code the refresh read the generation itself, after the sign-out, so it saw a value that matched and published. With the new code it receives the stale one and stands down. Same call sequence, opposite outcome. Reverting only the source line — shadowing the parameter with a fresh read, which is the pre-fix behaviour exactly — turns it red with the message naming the harm: One neighbour went red in that run too —
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tinysweeper found nothing blocking. Approving.
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critique: $0.0460 · 34,351 in / 16,762 out · 24,057 cached (70%) · z-ai/glm-5.2, deepseek/deepseek-v4-flash
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description: $0.0190 · 12,158 in / 6,714 out · 9,055 cached (74%) · z-ai/glm-5.2
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| #[test] | ||
| fn a_sign_out_landing_after_the_generation_check_still_wins_the_failure_record() { | ||
| let _cache_lock = APP_STATE_CACHE_TEST_LOCK.lock(); |
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Hold the failure test lock in sync tests that touch CURRENT_USER_FAILURE
This #[test] calls forget_current_user_caches (which clears CURRENT_USER_FAILURE) and record_current_user_failure_unless_stale (which writes CURRENT_USER_FAILURE), then asserts on CURRENT_USER_FAILURE.lock(), but it only acquires APP_STATE_CACHE_TEST_LOCK — not CURRENT_USER_FAILURE_TEST_LOCK. Every other new test in this diff that touches the failure record holds both locks; these three sync tests omit the failure lock. Two other new sync tests have the same gap: a_sign_out_landing_after_the_generation_check_still_wins_the_snapshot and publishing_under_the_current_generation_still_clears_a_recorded_outage — both call forget_current_user_caches and/or functions that mutate CURRENT_USER_FAILURE without the failure lock. Without the lock these tests can race with any concurrent test that also touches CURRENT_USER_FAILURE without holding the cache lock.
[RULE] missing-test-lock ·
| } | ||
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| #[test] | ||
| fn a_sign_out_landing_after_the_generation_check_still_wins_the_failure_record() { |
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Hold the failure test lock in tests that touch CURRENT_USER_FAILURE
This test calls record_current_user_failure_unless_stale and asserts on CURRENT_USER_FAILURE.lock() but never takes CURRENT_USER_FAILURE_TEST_LOCK, so it can race with any concurrent test that seeds or clears the failure global. The two other new sync tests have the same gap: a_sign_out_landing_after_the_generation_check_still_wins_the_snapshot calls publish_current_user_unless_stale (which clears CURRENT_USER_FAILURE), and publishing_under_the_current_generation_still_clears_a_recorded_outage calls record_current_user_failure and asserts on CURRENT_USER_FAILURE.lock(). Every other test in this suite that touches either global holds both locks; these three should too.
[RULE] missing-test-lock ·
How this change flows5 changed behaviours across 24 relationships. 6 surrounding behaviours are shown (60 graph nodes walked). 43 further behaviours left out to keep the diagram readable. flowchart LR
n0["clear_current_user_failure<br/>changed"]:::changed
n1["..._deferred_session_after_backend_rejection<br/>changed"]:::changed
n2["fetch_current_user_cached<br/>changed"]:::changed
n3["snapshot<br/>changed"]:::changed
n4["clear_session<br/>changed"]:::changed
n5["current_user_generation"]:::impacted
n6["forget_current_user_caches"]:::impacted
n7["format"]:::impacted
n8["..._races_sign_out_does_not_record_a_failure"]:::impacted
n9["store_session_inner"]:::impacted
n10["...the_token_load_and_the_refresh_still_wins"]:::impacted
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classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff
Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge. |
…e record Three of the new tests touch CURRENT_USER_FAILURE - through forget_current_user_caches, record_current_user_failure_unless_stale and publish_current_user_unless_stale - while holding only the cache lock. Seven existing tests in this suite take only the failure lock, so those two sets could run concurrently and clobber each other's global. That is not hypothetical: reverting the source fix in the previous round turned a_recorded_failure_suppresses_a_retry_inside_its_window red as collateral, and it is the first of the seven. The failure lock is async, which is why these three were written sync and unguarded. Converted to #[tokio::test] and taking both guards in the same order as every other test here. No test touching the failure record now holds only the cache lock.
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@tinysweeper Correct on all three tests, and this one is not hypothetical — I had already watched it happen and mis-attributed it. Fixed in In my previous comment I reported that reverting the source fix turned two tests red, the second being So the two sets could genuinely run concurrently against the same global, and one of them did. Why they were written that way
The audit above is the check worth keeping rather than the fix: the invariant is no test that touches either global may hold only one lock, and it is now true in both directions. |
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CI Lite went red on The failure The same test was green one commit earlier, in this same job
Same total (1017), and the red run was the faster of the two — so this is not the commit adding load. Why it fails, at source level
gate.decide(&request_id, ApprovalDecision::ApproveOnce).unwrap();
assert!(matches!(handle.await.unwrap(), GateOutcome::Allow));
And So the assertion that fails names the wrong event: it reports "the outcome was not Allow" when what actually happened is "the decision arrived after the row had expired". Under What I am asking for I do not have re-run rights on this repo — could someone re-run Rust Core Coverage? Everything else on the PR is green and both reviewers have approved. Separately, I would be glad to open a small PR against this test that (a) asserts |
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Addendum with a number, now that the local run finished on this exact commit ( 0.04s against a 2s TTL — a 50× margin when the test runs alone. That is why it never flakes locally and why it can still flip under |
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Sent the de-flake as its own PR: #5834. It leaves this branch alone — tests only, no production code — so the two approvals here stand. It also turned up one test the obvious search misses: |
1 participant
Closes #5758.
clear_sessionremoved the auth profile, tore down the socket, clearedactive_user.toml, stopped login-gated services and rebound the process globals — but left both current-user caches populated. Both are keyed on(api_base, token), so signing out and back in with the same JWT inside their windows replays pre-logout state.The intent was already written down.
clear_current_user_failure's own doc comment:Sign-out was the missing one.
Shape of the fix
The two statics are private to
desktop::app_state::ops, so the pair gets one public entry point,forget_current_user_caches(). The existing invalidation site inclear_deferred_session_after_backend_rejectionroutes through it as well, so there is still exactly one writer of each global — which is what made the issue's "single-site fix, not an audit" framing hold.clear_sessioncalls it right after the socket teardown, before the active-user marker is cleared.Tests, and the one that went red
Two cases pin that the helper clears each cache. Getting them right mattered more than writing them.
My first version took only
APP_STATE_CACHE_TEST_LOCK. But the failure cache is serialised by a separateCURRENT_USER_FAILURE_TEST_LOCK, so my test wiped a sibling's seeded state mid-run and turnedfetch_current_user_cached_replays_a_recorded_failure_without_calling_the_backendred:Since
forget_current_user_cachestouches both globals, both cases now hold both locks, in a consistent order (no other test in the file takes more than one, so there is nothing to deadlock against). The negative case also seeds through the suite's existingseed_current_user_failurehelper rather than assigning the static directly, so it exercises the same shape the poll path produces.I only caught this by running the whole
app_statesuite rather than just my two tests — worth saying, because the target-test-green-therefore-done shortcut is exactly what would have hidden it.Scope
These tests pin the helper's contract, not that
clear_sessioncalls it —clear_sessiontouches the keyring, sockets and filesystem, so it is not reachable from a unit test. The call-site wiring is verified by reading. If you would rather have that covered too, say so and I will look at what seam would make it testable.Verification
cargo test --lib app_state— 44 passed (42 pre-existing + 2 new).cargo test --lib security::credentials— 183 passed.cargo fmt --all— clean.Summary by CodeRabbit
Bug Fixes
Tests