fix(app-state): decode gzip peer recovery without bypassing snapshot MAC by joaomdsferro · Pull Request #1698 · oxidezap/whatsapp-rust

joaomdsferro · 2026-10-07T23:00:36Z

A primary device can return a snapshot recovery flagged is_compressed in gzip format. The existing zlib-only decoder rejects that response, leaving the collection behind its failed snapshot validation. Decode complete gzip recoveries as well as zlib, with the same decompressed-size ceiling.

The automatic aggregate snapshot-MAC bypass has been removed. Unusable peer replies release their request marker and preserve strict snapshot validation. Valid replies must also match the generation recorded when the request was made; retired replies are rejected before decoding. Recovery waits up to 60 seconds for an authenticated, reachable connection before binding each request to its socket and generation. A reconnect releases that request and permits one retry, for at most two attempts. Superseded generations do not suppress a fresh request, and an older sender cannot replace a newer marker.

Local validation: the complete client library suite with tracing passed 2,689 tests (three skipped). Client Clippy with all targets, tracing, and -D warnings, formatting, and whitespace checks passed. The authentication regression was also run against the prior behavior and failed as expected before applying the fix. The final GitHub matrix completed with 38 passing checks, three expected skips, and two neutral optional checks, including Rust CI, Supply Chain, WASM, API Consumers, Miri, and Binary Size. E2E and integration benchmarks are skipped by the external-fork secret gate; the push-only binary job is also skipped. The optional cubic and CodSpeed comparison checks conclude neutral. No gates or budgets were changed.

Validation covers the actual PDO recovery decoder with synthetic gzip/zlib/raw protobuf payloads, checksum corruption, truncated streams, extra gzip members, trailing bytes, invalid protobufs, and the gzip size boundary. Recovery tests cover replay/stale versions, persistence failure and retry, request consumption, and retired connection generations. Main is integrated through fb970318c, including #1679 and #1715. The existing public request-marker method remains available.

Protocol evidence was checked statically against whatspec b7db247, schema 4.3.0, WA 2.3000.1047483476, set 05609307e68b0f6ccfd2a121a573049999e38b752cfe7155ebbe5c661805751b. All 579 locked bundle hashes and sizes were verified. The exact archive has SHA256 22243b9c2ff18a66cea8fd66551821fe0f9f09786d107e2be8284637db86c349.

WAWebSyncdCollectionHandler, bundle 4oJRvhb3yiE.js, SHA256 f588ee2f033b87e018a3be34a37ec1347d8b6b8700de539e6be31481b29c4690, bytes 1711365–1757084, calls recovery after eligible snapshot-validation failure and throws SyncdFatalError when recovery returns null, before applying mutations or committing the version. WAWebRequestSyncdSnapshotRecovery, bytes 1798730–1802971, returns null on timeout/processing failure. Complete modules were extracted with an AST parser; no duplicate definitions were found for these modules. This establishes the observed Web capture's behavior, not server behavior or other clients.

The author's earlier authenticated re-link reported successful gzip recovery without using the MAC bypass. This revision uses synthetic tests and static bundle analysis; no authenticated client run was performed.

Performance qualification: a pinned comparison on one runner did not reproduce the cross-run CodSpeed regressions. DM was 1,184.765 → 1,183.322 µs, with identical allocation counts and bytes; SQLite activity peak was exactly 1,963,718 B on both SHAs. The complete client lifecycle peak differed by two bytes. The triage includes raw-profile provenance, paired labels, inherited #1679 allocator cost, and measurement limits. No thresholds or CI gates were changed.

Peer snapshot recovery now also accepts gzip and raw deflate replies and reports the header of one it cannot read. When recovery fails, the collection's next snapshot is applied despite the aggregate MAC mismatch, with every record still checked on its own, instead of staying empty.

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📝 Summary

Summary by CodeRabbit

Bug Fixes
- Recovery replies from outdated connection generations are discarded, preventing stale data from advancing a collection version.
- Snapshot recovery waits for an authenticated, reachable connection and retries once if the connection changes; repeated changes now return an error.
- Snapshot recovery decoding rejects incomplete, trailing, or oversized compressed data, as well as empty gzip output.
- Recovery requests are associated with their connection generation, preventing outdated requests from replacing newer ones.
Tests
- Added coverage for stale replies and retaining, replacing, and consuming recovery requests by generation.

Snapshot recovery requests now retain their connection generation. Recovery sends use a captured connection and can retry once after a connection change. The client rejects stale replies. Recovery payload decoding supports uncompressed, zlib, and gzip data with stream validation.

Changes: Snapshot recovery

Layer / File(s)	Summary
Record recovery request generations `wacore/src/appstate_sync.rs`, `src/appstate_sync.rs`	Recovery requests store their connection generation and can be claimed or taken with that generation. Existing collection-only methods remain available. Tests cover request retrieval, replacement, and deduplication.
Send recovery requests on a captured connection `src/pdo.rs`, `src/client/messaging.rs`, `src/send/mod.rs`	Recovery waits for a reachable authenticated connection, records its generation, and sends through its captured socket. It retries once after a connection change. Tests cover reconnects, retry limits, and socket selection.
Decode and validate recovery payloads `src/pdo.rs`	Recovery decoding handles uncompressed input and tries zlib before gzip for compressed input. It rejects incomplete streams, trailing data, and output beyond the configured limit. Tests cover supported formats and validation cases.
Reject replies from retired generations `src/pdo.rs`, `src/client/app_state.rs`	Recovery response handling checks the request’s recorded generation before decoding. The client consumes the outstanding request and drops a reply when its generation differs. Tests verify retired replies do not update the collection version.

Priority: ➖ Normal

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant AppStateProcessor
  participant NoiseSocket
  participant RecoveryDecoder
  Client->>AppStateProcessor: record request ID and connection generation
  Client->>NoiseSocket: send recovery request on captured socket
  NoiseSocket->>Client: return recovery response
  Client->>AppStateProcessor: claim request and its generation
  Client->>RecoveryDecoder: decode response if generation is current

Suggested reviewers: llawli, salientekill

Merge Risk: 🟡 Moderate · up to dabf1

Recovery can still commit after a connection changes, or leave a collection unsynced when a peer answer is refused. These paths should be resolved before merging.

Pre-merge checks: 5

Passed checks: 5 passed

Check name	Status	Explanation
Docstring Coverage		Docstring coverage is 86.36% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 44 functions across 8 files.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly identifies the main recovery fix: gzip peer recovery without bypassing snapshot MAC validation.
Description check		The description directly explains the gzip decoding, strict MAC validation, generation handling, retry behavior, and validation results.

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greptile-apps · 2026-10-07T23:05:32Z

Confidence Score: 5/5

[Critical impact] The PR appears safe to merge; no new blocking issue was found.

Summary

The PR accepts complete gzip peer recoveries alongside zlib and keeps strict snapshot MAC checks.

Compressed peer recoveries can now arrive as gzip or zlib.
Snapshot recovery replies stay tied to the connection that requested them.

Review checks were static; no tests were run during this review.

Diagram

sequenceDiagram
  participant Sync as App-state sync
  participant Client
  participant Socket as Captured socket
  participant Peer as Primary device
  Sync->>Client: Request snapshot recovery
  Client->>Client: Wait for authenticated connection
  Client->>Client: Record request ID and generation
  Client->>Socket: Send on captured socket
  alt Connection retires during send
    Client->>Client: Remove old marker and retry once
  else Send succeeds
    Socket->>Peer: Recovery request
    Peer-->>Client: Recovery reply
    Client->>Client: Check request generation
    Client->>Client: Decode complete bounded gzip or zlib
    Client->>Client: Reserve collection and apply recovery
  end

_{Reviews (10) · Last reviewed commit: "fix(app-state): wait for authenticated r..." · Reviewed by Greptile}

…ccount The tolerance lived in a process-wide static keyed by collection name and was never cleared, so one account's failed recovery waived the aggregate MAC for every account in the process, for every later snapshot. It now lives on the AppStateProcessor and is spent by the next snapshot of that collection, applied or not. Non-zlib recovery payloads must also end exactly where the payload does: a gzip reader stops after its first member and a raw deflate one after its final block, which would apply a parseable prefix as the whole collection. The fallback resync now reports collections it left unsynced instead of only hard errors.

…llback A fallback resync can end without processing a snapshot (refused, stale, or failed request), which left the grant for whatever snapshot of that collection came next, possibly much later. Withdraw it once the attempt it was granted for is over.

A re-link confirmed the primary sends its snapshot recovery as gzip (header 1f 8b 08 00). Drop the speculative raw deflate fallback.

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Inline comments:
Review comments at @src/client/app_state.rs:
- Line 3597: Update fall_back_to_unverified_snapshot to accept the recovery’s
connection generation and verify it still matches the active connection before
granting snapshot MAC tolerance or starting a resync. Pass the captured recovery
generation from both the decode-failure and apply-error callers, so obsolete
recoveries cannot affect a replacement connection.

Review comments at @src/pdo.rs:
- Around line 1095-1097: Update the correlated recovery-response handling around
`client.fall_back_to_unverified_snapshot` so that, after taking the request,
empty recovery payloads, missing recovery results, and over-limit payloads
invoke the same fallback as decode errors. Preserve the existing handling for
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… it for unusable answers A recovery that failed to decode after a reconnect granted the snapshot MAC tolerance and resynced on the replacement connection. The fallback now takes the generation of the connection the recovery belongs to and does nothing once it has changed. An answer with no result, no collection, or a payload over the limit spent the request without falling back, leaving the collection stuck. They now fall back too, when they are the ones that spent it.

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🔵 Trivial · inflate_gzip discards the failure reason. · pdo.rs:3845-3866

src/pdo.rs:3845-3866
📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

inflate_gzip discards the failure reason.

Each failure returns None. The caller reports only the zlib error plus "not gzip either". A truncated gzip stream and trailing bytes after a valid gzip stream look the same in the log. Return Result<Vec<u8>, String> so the log shows the real gzip failure. The primary would then be diagnosable.
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Review comment at @src/pdo.rs around lines 3845 - 3866:
Update inflate_gzip to return Result<Vec<u8>, String> instead of
Option<Vec<u8>>, preserving the decompressed payload on success and returning a
descriptive error for each failure, including decoder errors, empty or oversized
output, and trailing bytes. Update its caller to include the gzip failure reason
in the existing diagnostic log.

🔵 Trivial · Add a test for the zlib failure followed by the gzip success path. · pdo.rs:1082-1093

src/pdo.rs:1082-1093
📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

Add a test for the zlib failure followed by the gzip success path.

The gzip fallback runs inside the handler closure. The new unit tests cover inflate_gzip only. A test at the closure level would confirm that a gzip payload reaches syncd_snapshot_recovery_decode. The risk is low, and the logic is simple.
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Review comment at @src/pdo.rs around lines 1082 - 1093:
Add a unit test for the handler closure containing the inflate_zlib/inflate_gzip
fallback, using a gzip payload that fails zlib inflation and verifying it
reaches syncd_snapshot_recovery_decode successfully.

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Inline comments:
Review comments at @src/pdo.rs:
- Around line 937-945: Capture the connection generation before processor awaits
so `fall_back_to_unverified_snapshot` validates against the connection that
initiated recovery. In `src/pdo.rs` lines 937-945, capture it before
`claim_recovery_request_by_id` and pass it to the fallback; in lines 1057-1067,
reuse the generation captured before the claim at line 1015; in lines 983-996,
reuse the generation captured at the start of
`handle_syncd_snapshot_recovery_response`.

---

Outside diff comments:
Review comments at @src/pdo.rs:
- Around line 3845-3866: Update inflate_gzip to return Result<Vec<u8>, String>
instead of Option<Vec<u8>>, preserving the decompressed payload on success and
returning a descriptive error for each failure, including decoder errors, empty
or oversized output, and trailing bytes. Update its caller to include the gzip
failure reason in the existing diagnostic log.
- Around line 1082-1093: Add a unit test for the handler closure containing the
inflate_zlib/inflate_gzip fallback, using a gzip payload that fails zlib
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…sked The recovery marker survives reconnects, so a late answer to an ask made on an earlier connection passed the generation check when the fallback used the live counter. The marker now records the generation it was asked on, and every fallback site uses that one.

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🟠 Major · Start fallback when a peer answer is refused before application. · app_state.rs:3391-3400

src/client/app_state.rs:3391-3400
🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Start fallback when a peer answer is refused before application. Both branches spend a correlated request without applying recovery or starting fallback. If the collection's snapshot MAC still fails, that answer leaves the collection unsynced.

src/client/app_state.rs#L3391-L3400: take the over-limit request with its recorded generation and start fallback.

src/pdo.rs#L1137-L1143: take the wrong-name request with its recorded generation and start fallback for the requested collection.
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Review comment at @src/client/app_state.rs around lines 3391 - 3400:
In src/client/app_state.rs lines 3391-3400, update the over-limit recovery
refusal path to take the correlated request with its recorded generation and
start fallback for the collection. In src/pdo.rs lines 1137-1143, update the
wrong-name refusal path to take the request with its recorded generation and
start fallback for the requested collection.

🟠 Major · Recheck the request generation inside the fallback task. · app_state.rs:3624-3629

src/client/app_state.rs:3624-3629
🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win

Recheck the request generation inside the fallback task.

If the connection changes after the check at Line 3609 but before this detached task runs, the task grants MAC tolerance on the replacement connection. It then starts a resync without confirming that generation still matches. Check the captured generation before granting tolerance and after awaits that precede the resync. This keeps an old answer from authorizing a snapshot on a new connection.
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Review comment at @src/client/app_state.rs around lines 3624 - 3629:
In the detached task that calls tolerate_next_snapshot_mac_mismatch and
resync_app_state_collection, recheck the captured request generation before
granting MAC tolerance and again after the tolerance await, before starting the
resync. Exit without either action if the generation no longer matches.

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Review comments at @src/client/app_state.rs:
- Around line 3483-3485: In the recovery response flow, retain the `asked_on`
generation returned by `take_recovery_request_with_generation_by_id` and compare
it with the live generation before applying the answer. Use `asked_on` in the
subsequent `still_current` check so responses from retired request generations
cannot replace the collection.

---

Outside diff comments:
Review comments at @src/client/app_state.rs:
- Around line 3391-3400: In src/client/app_state.rs lines 3391-3400, update the
over-limit recovery refusal path to take the correlated request with its
recorded generation and start fallback for the collection. In src/pdo.rs lines
1137-1143, update the wrong-name refusal path to take the request with its
recorded generation and start fallback for the requested collection.
- Around line 3624-3629: In the detached task that calls
tolerate_next_snapshot_mac_mismatch and resync_app_state_collection, recheck the
captured request generation before granting MAC tolerance and again after the
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generation no longer matches.

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…nection inside the fallback A recovery refused for carrying too many records, or for naming another collection, spent the request without falling back, leaving the collection stuck behind its snapshot MAC. Both now fall back like an undecodable one. The fallback checked the connection only before spawning its task, so a reconnect before the task ran let it grant the MAC tolerance and resync on the replacement. The task now rechecks before the grant and after it.

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- Line 3638: Scope the temporary MAC-mismatch grant created by
resync_app_state_collection to that recovery generation, or a unique grant
token, so a replacement connection cannot consume it; revoke the matching grant
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jlucaso1

Requesting changes for the additional WhatsApp Web parity issue in the inline comment. Please keep this PR focused on the gzip decompression fix, which matches the inspected Web recovery path and resolves the reported account's problem.

The generation/grant lifecycle findings are already covered by the existing recovery-generation thread and grant-consumption thread, so I am not adding duplicate inline reports.

For the retained decompression fix, please add a regression using a synthetic encoded SyncdSnapshotRecovery in a gzip response with is_compressed = true, exercising the actual recovery decode path. The current gzip tests cover stream framing but would not catch a regression in format selection or protobuf decoding.

Validation: static review of head 27bfa7c and AST-extracted modules from the hash-verified whatspec capture. Rust tests were not run locally because this environment has no Rust toolchain.

jlucaso1

Placing the gzip regression test request next to the relevant test.

jlucaso1 · 2026-10-13T22:57:02Z

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- Line 518: Update the outstanding recovery request check in the flow that
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jlucaso1 · 2026-10-13T23:52:31Z

@codex review

jlucaso1 · 2026-10-13T23:55:08Z

@coderabbitai review

The outstanding recovery-generation findings are fixed in dabf110. Please re-review the current head. The complete tracing client suite passed 2,689 tests (three skipped), and all-targets tracing Clippy with -D warnings passed. The pre-login reconnect regression failed against the old behavior and passed after the fix.

coderabbitai · 2026-10-13T23:55:16Z

✅ Action performed

Review finished.

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chatgpt-codex-connector · 2026-10-14T00:00:42Z

Codex Review: Didn't find any major issues. 👍

Reviewed commit: dabf1100ab

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The requested changes in this review are addressed at dabf110: the automatic snapshot-MAC bypass is removed, and synthetic gzip SyncdSnapshotRecovery fixtures exercise the actual PDO decoder. All associated threads are resolved. The complete client tracing suite passed 2,689 tests (three skipped), Clippy all-targets tracing -D warnings passed, CodeRabbit approved the current head, and the explicitly requested Codex review completed without findings. Dismissing only this superseded review; CI and approval policies remain unchanged.

codspeed · 2026-10-14T00:22:45Z

Merging this PR will degrade performance by 15.56%

⚠️

112 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

delete_sessions_each[8]

delete_sessions_each[64]

activity_peak[true]

delete_sessions_each[256]

update_sessions_warm[64]

receipt

ack

cache_maintenance_after_activity[false]

presence_subscribed

skdm_target_resolution_warm[512]

…and 102 more

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
❌ 2 regressed benchmarks
✅ 853 untouched benchmarks
⏩ 18 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Simulation	`dm_receive`	759.5 µs	1,107.1 µs	-31.39%
❌	Memory	`activity_peak[true]`	1.9 MB	2.3 MB	-19.91%
⚡	Memory	`cache_maintenance_after_activity[true]`	13 KB	11.8 KB	+9.56%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing joaomdsferro:omega-zap/regular-low-recovery-pr (dabf110) with main (fb97031)}

18 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

jlucaso1 · 2026-10-14T01:16:07Z

The CodSpeed alert is qualified by a pinned comparison on one runner; it was not a demonstrated receive-path regression introduced by this PR.

The original report compared fb97031 with dabf110 and flagged dm_receive at 759.5 → 1,207.2 µs, while warning about different environments. Its flamegraphs put essentially the entire 447.6 µs delta in _int_malloc/malloc_consolidate. Decryption remained about 177 µs, and both SHAs allocated exactly 11,198 bytes in 27 calls with a 10,468-byte peak. A repeat of the unchanged head changed DM to 1,107.1 µs and also changed the activity memory classification. The original cross-run headline is therefore not a reliable estimate of this patch's cost.

The paired CI qualification completed successfully. It pins base fb97031 and head dabf110, and measures both sequentially on the same host, target, nightly compiler, glibc, executor versions, and malloc settings. Manifests, lockfiles, harnesses, and normalized benchmark workloads are checked for equality. The artifact preserves those checks and both raw profiles.

Benchmark / instrument	Main control	PR head
DM / Simulation	1,184.765 µs	1,183.322 µs
DM burst / Simulation, 50 messages	5,377.625 µs	5,383.562 µs
DM / Memory peak	10,468 B	10,468 B
SQLite activity / Memory peak	1,963,718 B	1,963,718 B
Complete SQLite client lifecycle / Memory peak	5,223,870 B	5,223,872 B

The paired CodSpeed run uses base_fb970318_ and head_dabf1100_ labels; its aggregate commit is the upload identity, not the identity of every benchmark. DM is 0.12% faster, burst cost differs by 0.11%, and the reported activity peak regression does not reproduce. Both DM flamegraphs now show _int_malloc around 829 µs and decrypt around 177 µs.

The expensive Box::pin in receive.rs:706 is inherited from #1679, as confirmed by blame; receive.rs, the receive harness, and its benchmarks are unchanged by #1698. #1716 addresses that shared cost separately. This qualification does not claim that libc's heap history can never vary or that CPU simulation measures syscall-heavy walltime; the complete-lifecycle simulation includes a syscall warning. No performance threshold, CI gate, or production behavior was weakened, and no performance build was run on the laptop.

joaomdsferro added 2 commits October 7, 2026 23:59

fix(pdo): log which format a non-zlib snapshot recovery used

5802f0e

greptile-apps Bot reviewed Oct 7, 2026

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Comment thread wacore/appstate/src/processor.rs Resolved

Comment thread src/pdo.rs Resolved

Comment thread src/client/app_state.rs Resolved

joaomdsferro added 3 commits October 8, 2026 16:43

fix(pdo): decode only gzip as the non-zlib recovery format

2703516

A re-link confirmed the primary sends its snapshot recovery as gzip (header 1f 8b 08 00). Drop the speculative raw deflate fallback.

joaomdsferro marked this pull request as ready for review October 8, 2026 16:25

Copilot AI balanced review requested due to automatic review settings October 8, 2026 16:25

Copilot AI reviewed Oct 8, 2026

coderabbitai Bot requested a review from jlucaso1 October 8, 2026 16:27

coderabbitai Bot requested changes Oct 8, 2026

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Comment thread src/client/app_state.rs Resolved

Comment thread src/pdo.rs Resolved

greptile-apps Bot reviewed Oct 8, 2026

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Comment thread src/pdo.rs Resolved

coderabbitai Bot requested changes Oct 8, 2026

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Comment thread src/pdo.rs Resolved

coderabbitai Bot requested changes Oct 8, 2026

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Comment thread src/client/app_state.rs Resolved

coderabbitai Bot requested changes Oct 8, 2026

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Comment thread src/client/app_state.rs Resolved

jlucaso1 previously requested changes Oct 9, 2026

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Comment thread wacore/appstate/src/processor.rs Resolved

jlucaso1 reviewed Oct 9, 2026

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Comment thread src/pdo.rs Resolved

jlucaso1 added 2 commits October 13, 2026 19:49

Merge remote-tracking branch 'origin/main' into HEAD

29c7ebd

fix(app-state): preserve strict MAC validation and scope peer recovery

005c8f1

jlucaso1 changed the title ~~fix(app-state): recover collections whose snapshot MAC never validates~~ fix(app-state): decode gzip peer recovery without bypassing snapshot MAC Oct 13, 2026

greptile-apps Bot reviewed Oct 13, 2026

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Comment thread src/pdo.rs Resolved

coderabbitai Bot requested changes Oct 13, 2026

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Comment thread wacore/src/appstate_sync.rs Resolved

chatgpt-codex-connector Bot reviewed Oct 13, 2026

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Comment thread src/client/app_state.rs Resolved

Comment thread src/pdo.rs Resolved

fix(app-state): bind recovery sends and claims to their generation

311f538

chatgpt-codex-connector Bot reviewed Oct 13, 2026

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Comment thread src/pdo.rs Resolved

fix(app-state): wait for authenticated recovery retry scope

dabf110

coderabbitai Bot approved these changes Oct 14, 2026

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jlucaso1 mentioned this pull request Oct 14, 2026

feat(groups): gate notifications on durable capture #1699

Merged

jlucaso1 merged commit c73489c into oxidezap:main Oct 14, 2026
51 checks passed

jlucaso1 mentioned this pull request Oct 14, 2026

docs: consolidate protobuf evolution and durable inbound contracts oxidezap/whatsapp-rust-docs#622

Merged

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