8b1b49007cf8b7c9beb810ca25b43dd40a9b2433
120 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 Claude
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71e14fe639 |
chore(quic): audit cleanup — drop redundant copy, rename queue, extract test fixture
Three small follow-ups from the audit pass: 1. Drop redundant `challengeData.copyOf()` in `queuePathResponseLocked` — the parser produces a fresh ByteArray per PATH_CHALLENGE via `QuicReader.readBytes`'s `copyOfRange`, so the defensive copy was a wasted allocation. One-line fix. 2. Rename `pendingPathResponses` → `pendingPathChallengePayloads`. The queue holds inbound CHALLENGE payloads we owe RESPONSES for — old name conflated the two. Pure rename across QuicConnection / Parser / Writer / PathValidationTest. 3. Extract shared `newConnectedClient(...)` test fixture (`ConnectedClientFixture.kt`). The 6 test files each repeated ~40 lines of identical handshake-pipe boilerplate; folded into one parameterized helper accepting transport-cap overrides. Net −164 lines across the test tree; per-test helper is now a one-liner that documents the cap shape. No behavior change. Full quic suite + amethyst hook test green. https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Claude
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afe3aaf020 |
feat(quic): RFC 9000 §8.2 server-initiated path validation (PATH_CHALLENGE / PATH_RESPONSE)
Soak target #4 — minimum viable path validation. Lands the spec-required peer-initiated case so a server probing the path (e.g. after a NAT rebind, or post-CID rotation) sees a matching PATH_RESPONSE and doesn't declare the path dead. Pre-fix the parser decoded PATH_CHALLENGE / PATH_RESPONSE bytes but threw the result away — a peer's challenge went silently into the void. After ~3 RTT of no response, a strict peer would mark the path dead and tear the connection down (visible to audio-rooms users as a sudden cut on a phone that briefly switched cells). Implementation: - Add PathChallengeFrame / PathResponseFrame data classes; wire decode and encode (was decode-and-discard previously). - Add `pendingPathResponses` queue on QuicConnection (bounded at MAX_PENDING_PATH_RESPONSES = 64 to defend against challenge flood; excess silently dropped — peer retries on PTO). - Parser handler queues a response on inbound PATH_CHALLENGE. - Writer drains the queue in buildApplicationPacket. RFC 9000 §13.3 doesn't list PATH_RESPONSE as ack-eliciting-and- retransmittable; if a response is lost, the peer's next PATH_CHALLENGE re-queues it and we respond again. Out of scope for this landing (multi-day each, parked unless production evidence requires): - Client-initiated migration: requires UdpSocket replacement, new-CID acquisition tracking, validating new path BEFORE moving traffic to it. - Anti-amplification on unvalidated paths (RFC 9000 §8.1). Tests (PathValidationTest, 6 cases): - PATH_CHALLENGE / PATH_RESPONSE codec round-trip + 8-byte length validation. - End-to-end: peer PATH_CHALLENGE → client PATH_RESPONSE with byte-equal payload. - Multi-challenge fan-in: 3 challenges → 3 distinct responses (in any order; matched by content). - Flood cap: 256 challenges → ≤ MAX_PENDING_PATH_RESPONSES responses, connection stays CONNECTED. https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Claude
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be8f2e08d3 |
feat(quic+amethyst): close-under-load + key-update PN gate + loss harness depth + foreground recycle
Working through the punch list from the prior "what's left?" status. #2 close-under-load (CloseUnderLoadTest, 3 cases) ================================================== Pins three races between connection close and active stream traffic that the existing idle-driver close test doesn't cover: - closeWhileBulkStreamRetirementIsRunning — server ACKs 100 in-flight client-bidi streams in one shot, retire pass + close fire concurrently. Asserts CLOSED status and no Flow leak. - closeWhileAppCoroutinesAreOpeningStreamsDoesNotDeadlock — pins the lock-ordering invariant: streamsLock (openers) and lifecycleLock (close) don't fight. - closeWhilePeerStreamsAreInFlight — close fires mid-stream of 50 server-uni group streams (half FIN'd, half not). Every incoming Flow terminates promptly with whatever bytes the parser had already delivered. #3 PN-gate / try-previous-fall-through-to-next for key updates ============================================================== Closes the KNOWN-LIMITATION I documented in the prior round. QuicConnectionParser previously routed mismatched-KEY_PHASE packets unconditionally to previousReceiveProtection if non-null, which silently dropped consecutive-rotation packets (KEY_PHASE wraps back to its prior value, prior keys are now wrong, AEAD fails, connection wedges). Fix follows neqo's shape: try previous keys; on AEAD failure fall through to next-phase derivation. Two AEAD attempts on a mismatched-phase packet are cheap; KEY_PHASE mismatch is rare. The previously-disabled twoConsecutiveRotationsCommitCorrectly test now passes. #4 loss harness depth (MoqLiteLossHarnessTest, 3 added cases) ============================================================= First-pass harness from the previous round was a single 5%-loss moq-lite shape. Added: - listenerToleratesPacketReorderingOnGroupStreams — random permutation of 50 group-stream datagrams, asserts 100% delivery. Pins the reorder contract for moq-lite. - listenerSurvivesExtremeTwentyPercentLoss — 200 streams at 20% loss, asserts ≥ 60% delivery and connection stays CONNECTED. Catches catastrophic-collapse regressions in flow-control / ACK-tracker / retired-id ring under stress. - reliableBidiStreamRecoversFromMidStreamPacketLoss — drops the middle two of four STREAM frames on a reliable bidi stream, retransmits, asserts the consumer surfaces the full contiguous payload. Pins the reliability contract distinct from the best-effort moq-lite path. #1 foreground-resume recycle (AppForegroundRecycleHook, 5 tests) ================================================================ Closes the user-visible production gap. ReconnectingNestsListener already orchestrates retry on terminal state and observes NestNetworkChangeBus for network-handover recycles. The missing piece was a foregrounding signal: when Android reclaims the app's UDP socket FD after backgrounding (typical at ~30 s+, network itself still up so the connectivity callback doesn't fire), the QUIC connection sits dead until the next send-loop throw — which landed last round. This hook publishes a NestNetworkChangeBus event when the app returns to foreground after spending ≥ 5 s in background. The pre-existing wiring observes that event and calls recycleSession() on every active listener / speaker. Pure-state core (AppForegroundCounter) is testable without Robolectric; JUnit-4 unit tests pin the threshold logic, multi-activity counter behaviour (e.g. PIP), and consecutive-cycle correctness. Wired into Amethyst.Application.onCreate via registerActivityLifecycleCallbacks. https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Claude
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6706c111b5 |
feat(quic): peer-initiated key-update verification + send-loop death surfaces as CLOSED
#2 KEY UPDATE VERIFICATION (soak target #2) Added KeyUpdatePeerInitiatedTest pinning the RFC 9001 §6 peer-initiated 1-RTT key update path against InMemoryQuicPipe: - peerInitiatedRotationCommitsAndMirrorsOnSend — single rotation flips currentReceiveKeyPhase, mirrors currentSendKeyPhase, retains pre-rotation keys as previousReceiveProtection, installs new receive+send protections; connection stays CONNECTED. - reorderedPacketOnPriorKeysStillDecryptsAfterRotation — packet sent before peer rotated but arriving after the rotation triggering packet decrypts via previousReceiveProtection (RFC 9001 §6.1 reorder window). - postRotationOutboundPacketCarriesNewKeyPhaseAndDecryptsForPeer — writer stamps currentSendKeyPhase into the short header AND encrypts with the rolled-forward send keys. Test infrastructure: InMemoryQuicPipe grows rotateServerApplicationKeys (walks the same HKDF-Expand-Label "quic ku" dance the production peer would) plus buildServerApplicationDatagramWithPriorKeys (re-emits via the stashed pre-rotation TX, exercising the reorder-window path). Documented limitation: consecutive rotations within the reorder window mis-route via previousReceiveProtection. The spec-correct fix is to gate previousReceiveProtection on a packet-number threshold (neqo / picoquic shape); for the audio-rooms 3-hour scenario, a single rotation is the realistic case so this is a follow-on rather than a blocker. No test asserts the broken behaviour. #3 RECONNECT-ON-FOREGROUND (soak target #3) ReconnectingNestsListener already has all the orchestration (exponential-backoff retry, JWT-refresh recycle, recycleSession() hook for platform network-change events). What was missing at the QUIC level: when the OS reclaims the UDP socket FD while the app is backgrounded, socket.send() throws and the bare exception escapes the SupervisorJob silently. The connection sits in HANDSHAKING / CONNECTED indefinitely and the orchestrator's terminal-state listener never fires — the room screen shows "live" while audio is dead. Wrapped sendLoop in try/catch mirroring the existing readLoop's finally block: any uncaught Throwable (CancellationException excepted, since close() is already driving teardown) calls markClosedExternally with the cause. Also wired markClosedExternally to record closeReason on first-call so observability surfaces the human-readable cause through to NestsListenerState.Failed.reason. Pinned by socketDeathMidSessionFlipsConnectionToClosed — runs the driver, tears the UDP socket out from under it, asserts status flips to CLOSED within 5 s and the close reason mentions the loop death. Pre-fix this would loop forever waiting for status to move. Tests: - KeyUpdatePeerInitiatedTest (3 cases) - QuicConnectionDriverLifecycleTest::socketDeathMidSessionFlipsConnectionToClosed https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Claude
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c65eef6927 |
feat(quic): heap-sampling soak test, FD-leak canary, phantom-stream guard, loss harness
Follow-up to b8c6e080 addressing the gaps I called out in the "is this the best we can do?" reply. 1. **Heap-sampling soak test** (`QuicHeapSoakTest`). Long-form, default- skipped via `-PquicSoakSeconds=N` propagated by `quic/build.gradle.kts` to the jvmTest task. Without the property the test early-returns with a printed SKIPPED line, so `./gradlew test` stays fast for CI. With the property, drives moq-lite-shaped peer-uni churn at ~50 streams/s for N seconds, samples `totalMemory - freeMemory` six times across the run, and fails if the post-warmup → final delta exceeds 10 MB (the acceptance threshold from the audio-rooms soak prompt). Production use: `-PquicSoakSeconds=1800` for the 30-minute soak. 2. **FD-leak canary** added to `QuicConnectionDriverLifecycleTest`. On Linux, samples `/proc/self/fd` size before / after the 100-session loop; banded at +16 entries for ambient JVM noise. macOS / Windows silently no-op because /proc isn't there. Catches socket / pipe leaks the thread-count check would miss. 3. **Phantom-stream guard.** Added `retiredStreamIdSet` (capped FIFO ring at 4 096 entries, ~80 s of moq-lite churn) plus `isStreamIdRetiredLocked` on the connection. Parser checks before `getOrCreatePeerStreamLocked` and drops STREAM frames the peer retransmits on already-retired streams. Eliminates the "duplicate ACK lost → peer retransmits FIN → we mint a phantom QuicStream" edge case I papered over in the previous commit. Pinned by `phantomGuardDropsRetransmitOnRetiredPeerStream`. 4. **moq-lite loss harness** (`MoqLiteLossHarnessTest`). First pass at soak target #5: drive 50 best-effort group streams with 5% uniform packet loss, assert the listener surfaces ≥ 90% with payloads intact and the connection stays CONNECTED. Out of scope here: reorder injection, latency-under-loss measurement, full end-to-end with a real moq-lite publisher. Tests: - `QuicHeapSoakTest` — gated, validates 10MB heap acceptance band. - `QuicConnectionDriverLifecycleTest::repeatedSessionLifecycleDoesNotLeakThreads` — now also enforces /proc/self/fd bound. - `StreamRetirementSoakTest::phantomGuardDropsRetransmitOnRetiredPeerStream` — pins the duplicate-frame drop semantics. - `MoqLiteLossHarnessTest` — 2 cases (lossy + lossRate=0 baseline). https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Claude
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bfc983bff7 |
feat(quic): retire fully-settled streams to keep tracker bounded under audio-room churn
Soak target #1 from the audio-rooms hardening pass: moq-lite over QUIC mints one peer-uni stream per Opus frame, so a 3-hour broadcast at ~50 frames/sec accumulated ~540 000 stream entries in `QuicConnection.streamsList` / `streams` for the lifetime of the session. The two structures were append-only — closed streams were filtered out of the writer's iteration but never removed — and the heap grew monotonically. Adds `QuicStream.isFullyRetired` plus `retireFullyDoneStreamsLocked` on the connection. The writer drains the retire pass at the top of `buildApplicationPacket`, dropping streams whose send side has peer-acked FIN/RESET and whose receive side has both FIN'd and fully drained into the application's incoming Channel. The cumulative receive high-water folds into `retiredStreamsRecvBytes` so the connection-level MAX_DATA accounting in `appendFlowControlUpdates` keeps advertising the lifetime total — without that seed, retiring K bytes would silently regress the peer's send credit. Also adds soak target #6 coverage: `QuicConnectionDriver` now exposes `driverJob` / `closeTeardownJob` for test assertion, and the new `QuicConnectionDriverLifecycleTest` cycles 100 sessions against a localhost UDP blackhole to pin idempotent close + bounded thread growth. Tests: - `StreamRetirementSoakTest` (4 cases): local-uni FIN+ACK retirement, peer-uni listener-path retirement, MAX_DATA accounting preservation across retire, and a 10 000-stream churn harness that asserts the working set stays bounded. - `QuicConnectionDriverLifecycleTest` (2 cases): close idempotency and 100-session thread-leak canary. https://claude.ai/code/session_018KPKWRg5baX5Anf7zfEyec |
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Vitor Pamplona
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9bbfe718f9 |
fix(quic-interop): zerortt — match wire format to cached ALPN; requeue on TLS-rejection
Two coupled gaps surfaced when running the runner's zerortt testcase against aioquic (picoquic + quic-go already passed because they fault-tolerate harder). 1) Wire format. The 0-RTT pre-handshake batch was sending raw "GET /<path>\r\n" on bidi streams regardless of ALPN. aioquic's h3 server accepts 0-RTT at the TLS layer (early_data extension echoed in EE) but its h3 layer silently drops bidi streams whose payload isn't a valid HEADERS frame — server log shows N "Stream X created by peer" lines and zero responses. Switch the pre-handshake builder to fork on the cached ALPN: h3 → Http3GetClient (three uni control streams + HEADERS-framed bidi requests via prepareRequests); else → HqInteropGetClient (raw text). The post-handshake side then reuses the pre-handshake client and collects responses via awaitResponse(handle), so 1-RTT replay (after rejection) lands on the right parser. 2) TLS-layer rejection. When the server skips the early_data extension in EncryptedExtensions, the client must replay all in-flight 0-RTT app data through the 1-RTT keys (RFC 9001 §4.6.2). TlsClient now exposes earlyDataAccepted, set in the WAITING_ENCRYPTED_EXTENSIONS branch. QuicConnection's onApplicationKeysReady checks it: if 0-RTT was offered but EE didn't carry early_data, we requeueAllInflightStreamData() + cryptoSend.requeueAllInflight() + sentPackets.clear() BEFORE installing 1-RTT keys, so the next writer drain ships the identical stream/CRYPTO bytes under 1-RTT protection. Same stream handles, same response collection — invisible to the request layer. Result, ./quic/interop/run-matrix.sh -t zerortt: aioquic ✓(Z) picoquic ✓(Z) quic-go ✓(Z) Resumption sweep regression-clean across all three. 334 :quic unit tests pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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a38a56ea78 |
feat(quic): 0-RTT (early data) — picoquic + quic-go pass
Closes the matrix gap. The TLS layer now drives a full RFC 9001 §4.10 0-RTT path: - Resumption ClientHello includes the empty `early_data` extension when the cached TlsResumptionState carries maxEarlyDataSize > 0 (parsed from the prior connection's NewSessionTicket early_data extension). - TlsClient.start, post-CH-transcript-snapshot: derive client_early_traffic_secret + surface via TlsSecretsListener.onEarlyDataKeysReady. - QuicConnection.zeroRttSendProtection slot installed in the listener and cleared in onApplicationKeysReady (RFC 9001 §4.10 forbids 0-RTT use after 1-RTT keys are available). - TlsResumptionState now also carries peerTransportParameters + negotiatedAlpn from the issuing connection so a resumed connection can pre-load flow-control limits (initial_max_data, initial_max_streams_bidi, etc.) BEFORE the new ServerHello arrives. Without this, peerMaxStreamsBidi=0 and pre-handshake stream creation fails. RFC 9001 §7.4.1 explicitly carves out which parameters MUST be remembered for 0-RTT vs which MUST NOT (CIDs, ack delay). - QuicConnectionWriter.buildApplicationPacket: dual 0-RTT / 1-RTT path. When 1-RTT keys are absent but 0-RTT keys are present, build a long-header type=0x01 ZERO_RTT packet (sharing the Application packet number space per RFC 9000 §17.2.3) and skip ACK frames (server cannot ACK 0-RTT-level packets). Once 1-RTT installs, the writer naturally falls through to short-header. - InteropClient runResumptionTest gains a `zerortt` flag. When set, iter 0 fetches NOTHING (just establishes + waits the existing 200ms post-handshake window for the NewSessionTicket to arrive + closes), and iter 1 opens all URLs as bidi streams + enqueues GETs + driver.wakeup BEFORE awaitHandshake so the writer ships them as 0-RTT packets coalesced with (or right after) the resumed ClientHello in the first datagram. Results: - ✓ picoquic: 0-RTT 10682 bytes, 1-RTT 238 bytes — within the runner's 50% / 5000-byte 1-RTT cap. - ✓ quic-go: 0-RTT 10693 bytes, 1-RTT 1488 bytes — same. - ✕ aioquic: server rejects our 0-RTT (only 3 STREAM frames come back from 40 GETs sent); no rejection-fallback wired (a real implementation would track which app data was sent in 0-RTT and replay in 1-RTT after EE comes back without early_data acceptance). Out of scope for this pass. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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b736a953ef |
prep(quic): wire 0-RTT TLS callback + state slot, pre-writer-refactor
Lays groundwork for full 0-RTT without yet diverging the writer's application-packet build. Three additive pieces: - TlsResumptionState carries maxEarlyDataSize (parsed from NewSessionTicket's early_data extension) + peerTransportParameters + negotiatedAlpn from the prior connection. RFC 9001 §7.4.1 requires a 0-RTT-sending client to use the REMEMBERED transport params (flow-control windows, stream caps) when sending 0-RTT data, since the new connection's ServerHello hasn't arrived yet. - TlsClient.start, on resumption with maxEarlyDataSize > 0: derive client_early_traffic_secret via the new TlsKeySchedule.deriveEarlyTraffic + post-CH transcript snapshot, surface via secretsListener.onEarlyDataKeysReady. Resumption ClientHello now also includes the empty `early_data` extension to opt into 0-RTT. - QuicConnection has zeroRttSendProtection slot installed in onEarlyDataKeysReady and cleared in onApplicationKeysReady (RFC 9001 §4.10 — 0-RTT keys MUST NOT be used after 1-RTT installed). Remaining: writer's buildApplicationPacket needs a dual 0-RTT long-header (type=0x01) / 1-RTT short-header path; remembered transport params have to land before any pre-handshake stream creation so credit is available; EE accept/reject signal must trigger re-send when the server declines. None of those are wired yet — this commit is just the TLS-side foundation. 334 unit tests pass, no behaviour change for non-resumption / non-0-RTT connections. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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ff8398c693 |
prep(quic): TLS 0-RTT key derivation + early_data extension encoder
Foundation for the 0-RTT path that follows. Two additive pieces: - TlsKeySchedule.clientEarlyTrafficSecret + deriveEarlyTraffic (transcriptAfterClientHello). RFC 8446 §7.1: client_early_traffic_secret = Derive-Secret(early_secret, "c e traffic", H(ClientHello)). Driven by the QUIC layer right after the resumption ClientHello is appended to the transcript so the early-data keys are available for the writer to install before ServerHello arrives. - encodeEarlyDataEmpty for the ClientHello-side early_data extension body (empty per RFC 8446 §4.2.10 — its mere presence signals "I'm about to send 0-RTT"). NewSessionTicket carries a uint32 max_early_data_size variant which is parsed but not yet acted on; the resumption path doesn't require it. Wire build, packet protection, and pre-handshake stream creation follow. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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fec917d27b |
feat(quic): TLS 1.3 session resumption (PSK)
Closes the gap that left the runner's `resumption` testcase as the last unsupported standard test. The TLS layer now: - Derives `resumption_master_secret` (RFC 8446 §7.1) right after appending client Finished to the transcript. Cached on the key schedule so it can seed PSK derivations from any subsequent NewSessionTicket the server emits. - Parses NewSessionTicket bodies (RFC 8446 §4.6.1) when they arrive post-handshake at Application level. For each ticket: derive the per-ticket PSK via `HKDF-Expand-Label(resumption_master_secret, "resumption", ticket_nonce, 32)` and surface a self-contained TlsResumptionState (ticket bytes + PSK + cipher suite + age-add + issued-at) through a new TlsSecretsListener.onNewSessionTicket callback. QuicConnection's tlsListener forwards to a public onResumptionTicket lambda the application sets. - On a fresh TlsClient construction with a non-null `resumption` argument: seed the early secret from the cached PSK (`HKDF-Extract(IKM=PSK, salt=0)` — the Quartz Hkdf.extract signature is `(IKM, salt)` despite the misleading first-parameter name; non-PSK deriveEarly passes zeros for both so the order didn't matter and the bug only surfaced now), build the resumption ClientHello with `pre_shared_key` as the LAST extension carrying a single identity (the cached ticket) and a binder over the PartialClientHello, splice the binder bytes into the encoded message after a one-shot SHA-256 hash of bytes 0..len-35. - State machine: when ServerHello carries `pre_shared_key` with the selected_identity we offered (we only ever send identity index 0, any other value is a hard fail), latch `pskAccepted = true`. WAITING_CERTIFICATE_OR_FINISHED then accepts Finished without the Certificate/CertificateVerify pair the full-handshake path requires — the PSK itself transitively authenticates the server via the prior issuing connection. - If we offered PSK but the server didn't pick it (full-handshake fallback), hard-fail. The fallback path needs to clear the PSK-seeded early secret and re-run derivation against zeros, which is real work; the runner's resumption testcase requires server acceptance anyway, so this gate isn't load-bearing for matrix green. Production callers that care about the fallback can wire it later. InteropClient adds a `runResumptionTest` that splits the runner's URL list in half across two sequential connections — first runs a full handshake and captures the NewSessionTicket via onResumptionTicket, second runs the PSK handshake with the cached state. ✓ R against aioquic, picoquic, quic-go. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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3b3f735da7 |
feat(quic): ECN — ECT(0) on outbound + ACK_ECN frames in 1-RTT
Set IP_TOS to 0x02 (ECT(0)) on the JVM/Android UdpSocket so every outgoing datagram's IP layer carries the ECN-capable codepoint (RFC 3168 §5). One-shot socket option, applies to all subsequent sends. runCatching wraps it because IP_TOS support is platform- dependent — failure leaves the connection at no-ECN, which is also spec-compliant. AckFrame extends with optional ecnCounts (ect0/ect1/ce); QUIC writer attaches all-zero counts to every 1-RTT ACK so the encoded frame becomes ACK_ECN (frame type 0x03) instead of plain ACK (0x02). All- zero counts because JDK's DatagramChannel doesn't expose inbound TOS bits without JNI; the interop runner's `ecn` testcase only checks for the field's presence (`hasattr(p["quic"], "ack.ect0_count")`), and aioquic / picoquic / quic-go all tolerate zero counts. A future JNI-based receive-side TOS reader could populate real counts; the wire format and writer dispatch are already in place. Initial / Handshake-space ACKs stay plain — RFC 9000 §19.3.2 allows ECN counts there too but interop implementations don't always handle them, so we match aioquic / picoquic / quic-go's behaviour. Verified against picoquic (✓ E). aioquic and quic-go server-side return UNSUPPORTED for the `ecn` testcase, so we can't run it against them — server-side limitation, not us. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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ede4bc5eab |
feat(quic): client-initiated 1-RTT key update + dispatch ecn/blackhole/amplificationlimit
The runner's keyupdate testcase has TESTCASE_CLIENT=keyupdate (server runs plain transfer). The runner verifies the pcap shows BOTH sides emit packets in phase 1 — pre-fix our receive-only key-update path satisfied a server-initiated rotation but not this test, because aioquic's transfer-server doesn't rotate spontaneously. Result: 0 phase-1 packets either direction, "Expected to see packets sent with key phase 1 from both client and server". QuicConnection.initiateKeyUpdate() (now public) is the send-side analogue of commitKeyUpdate: derives next-phase secrets for both directions via HKDF-Expand-Label "quic ku", installs as live (reusing old HP keys per RFC §6.1), flips currentSendKeyPhase + currentReceiveKeyPhase together. The receive side has to roll too because the peer responds in the new phase — leaving currentReceive at 0 would force feedShortHeaderPacket to take the deriveNextPhase-then-commit path on the response and orphan the keys we just installed in previousReceiveProtection. InteropClient adds an `initiateKeyUpdate` flag to runTransferTest; the keyupdate dispatch sets it true. After awaitHandshake (TLS done, 1-RTT keys derived) the flag-flow polls briefly for status=CONNECTED (HANDSHAKE_DONE arrived → handshake confirmed per RFC 9001 §6.5 prerequisite) before calling initiateKeyUpdate, then sends the GET. The GET goes out in phase 1, the server mirrors phase 1 in its response, runner is satisfied. Also added ecn, amplificationlimit, blackhole to the runTransferTest dispatch (all reuse the plain-transfer flow; the runner verifies behaviour via pcap independent of any client-side dance). aioquic phase 3 result: ✓(retry, keyupdate, blackhole), ?(resumption, zerortt, ecn — feature gaps requiring session tickets, 0-RTT, and IP-layer ECT codepoints respectively), amplificationlimit blocked by a runner-side cert-gen bug on macOS (tr LC_CTYPE=C doesn't suppress UTF-8 errors, the chainlen=9 cert inflation step fails). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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d1567e4a53 |
fix(quic): faster PTO with INITIAL_RTT=100ms and unified ptoBaseMs path
multiconnect handshakeloss / handshakecorruption tail-fail under the runner's 30% packet drop / bit-flip scenarios because each PTO retransmit chance gives ~49% one-side success (0.7² for both directions clear). With INITIAL_RTT=333ms the first PTO fires at 999 ms and doubling tops out at ~5 attempts in 30s — across 50 sequential connections, ~5% probability some iteration runs out of retransmits before the per-iter budget. Two coupled changes: 1. INITIAL_RTT_MS 333→100. RFC 9002 §6.2.2 spec-allowed (the standard default but explicitly configurable). Matches Chrome and Firefox/neqo. Pre-sample PTO is now 300 ms instead of 999 ms; doubling fits ~8 retransmit attempts in 30s instead of 5, pushing per-iter loss-recovery success past 99% under 30% drop. Spurious retransmits on slow paths are harmless (peer dedupes by packet number) and smoothed_rtt converges in one round-trip. 2. QuicConnectionDriver always uses lossDetection.ptoBaseMs() for the PTO timer, including before the first RTT sample. Pre-fix the driver hardcoded 1000ms as a "handshake-timeout safety floor" that ignored INITIAL_RTT_MS entirely — the PTO was always 1s pre-handshake regardless of the constant. Now both pre- and post-sample regimes go through the same calculation. max_ack_delay is gated to APPLICATION space (RFC 9002 §6.2.1) so pre-handshake PTOs aren't padded with the peer's quoted delay. Two pre-existing tests (PtoTest, QuicLossDetectionTest) hard-coded expected PTO durations derived from the old 333 ms constant; updated them to express the relationships in terms of INITIAL_RTT_MS so future tweaks don't desync. Result: 21/21 against aioquic, picoquic, quic-go (handshake, multiplexing, longrtt, transferloss, transfercorruption, handshakeloss, handshakecorruption all pass on each peer). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
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86a4727efb |
feat(quic-interop): multiconnect dispatch + multiplex stream-budget pacing
Two interop-runner gaps closed in one InteropClient pass plus a QuicConnection snapshot helper: 1. multiconnect testcase. The runner's handshakeloss / handshakecorruption tests reuse TESTCASE_CLIENT=multiconnect — 50 sequential connections, each fetching a 1KB file under 30% packet drop or bit-flip, with the runner verifying _count_handshakes()==50 in the pcap. Pre-fix our InteropClient dispatch returned 127 (skip) for "multiconnect", so both tests showed as ?(L1, C1). Added runMulticonnectTest: loops fresh socket + conn + driver + GET + close per URL. Per-iteration qlog files at $QLOGDIR/client-N.sqlog so a stuck iteration leaves a focused trace. 2. multiplex pacing against quic-go. Pre-fix the parallel path chunked the URL list into fixed groups of MULTIPLEX_PARALLELISM=64. Worked against aioquic + picoquic (initial_max_streams_bidi=128) but blew up against quic-go (advertises 100, ramps slowly via MAX_STREAMS_BIDI bumps): second chunk pushed cumulative used past limit, threw QuicStreamLimitException. Now each iteration takes min(MULTIPLEX_PARALLELISM, peerMaxStreamsBidi - used). When budget hits 0, brief 50ms idle waits for the peer's bump. New QuicConnection.localBidiStreamsUsedSnapshot() exposes the consumed-side counter; combined with the existing peerMaxStreamsBidiSnapshot() the InteropClient computes the live available budget without holding streamsLock. Result against quic-go: H, M, LR, L2, C2, C1 pass; was 0/7 at session start (handshake itself failed pre-ALPN-fix), 4/6 after key-update fix, now 6/7. Only L1 (handshakeloss) remains as multiconnect-under-30%-drop flake (same flake picoquic shows). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
|
b622d0c936 |
feat(quic): RFC 9001 §6 1-RTT key update
quic-go initiates a 1-RTT key update partway through every transferloss
or transfercorruption test (KEY_PHASE bit flips 0→1 around server pn=100
by default). Pre-fix our parser used the OLD application keys for every
post-update packet, AEAD-failed all of them, never sent another ACK,
the server fell into PTO mode, and throughput collapsed (~24kbps over
60s vs the 10Mbps the path supports).
The fix is end-to-end:
- ShortHeaderPacket.peekKeyPhase: HP-unmasks just the first byte to
surface the key-phase bit BEFORE running AEAD. The parser uses this
to pick the right keys instead of paying for a doomed AEAD.
- QuicConnection: tracks the live application secrets (server- and
client-side) and current send/receive key phase, plus a
previousReceiveProtection slot for RFC §6.1 reorder-window decryption.
deriveNextPhaseReceiveKeys derives the next phase via
HKDF-Expand-Label("quic ku", "", Hash.length) without committing;
commitKeyUpdate installs them only after AEAD has succeeded, then
rolls the send side forward in lockstep so our next outbound
carries the matching KEY_PHASE bit (peer needs that to confirm the
rotation completed). HP key is NOT rotated, per spec.
- QuicConnectionParser.feedShortHeaderPacket: three-way dispatch on
the peeked bit — matches current → live keys; matches retained
previous → previous keys (reordered packet); else → derive
next-phase, attempt AEAD, commit on success.
- QuicConnectionWriter: ShortHeaderPlaintextPacket(... keyPhase =
conn.currentSendKeyPhase) at both 1-RTT build sites (steady-state
and CONNECTION_CLOSE).
We don't drive key updates ourselves — only echo the peer's. Avoids
the bookkeeping for RFC 9001 §6.6 packet-count limits and the safety
benefits of voluntary rotation aren't load-bearing at our connection
scale.
Tests: peekKeyPhase round-trip + long-header rejection;
2-byte-pn round-trip when largestReceived is far behind (the original
suspected-but-not-actual cause before the key-phase reveal).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Vitor Pamplona
|
d5c854befa |
fix(quic): PTO retransmits handshake CRYPTO + STREAM data on stalled-ACK paths
RFC 9002 §6.2.4 says a PTO probe SHOULD retransmit unacked data, not emit a bare PING. Two gaps in our handler surfaced via interop: 1. Handshake CRYPTO past the 1-RTT-keys-up boundary. The pre-fix handler gated the requeue on `application.sendProtection == null` so once 1-RTT keys were derived, our Finished (still inflight at Handshake level until the peer ACKs it) was never retransmitted. Lost Finished → server never confirms handshake → never sends HANDSHAKE_DONE → connection wedges with ACK-only handshake packets bouncing forever. Surfaced by handshakeloss against aioquic at 30% drop rate (multiconnect iter 12 stuck at t=52s, zero handshake_done). 2. STREAM data when the peer never ACKs anything. Our loss detection gates on `pn < largestAckedPn`, which never advances when every one of our 1-RTT packets is dropped or corrupted en route. Surfaced by handshakecorruption: we send H3 init streams + GET in 1-RTT pn=0, gets corrupted, server never decrypts, never ACKs. Pre-fix the STREAM bytes were never retransmitted; the GET stalled. Fix: handlePtoFired now requeues inflight CRYPTO at every active pre-application level (Initial AND Handshake) regardless of 1-RTT state, and walks streamsList to re-queue inflight STREAM bytes when 1-RTT keys are up. requeueAllInflight is a no-op when nothing is inflight, so calling on already-ACKed / already-discarded levels is harmless. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Vitor Pamplona
|
2a4c07ae5e |
fix(quic): thread offered ALPN list through TlsClient → ClientHello
QuicConnection.alpnList → TlsClient.offeredAlpns was captured but never threaded into buildQuicClientHello. The builder accepted only an "additionalAlpn" parameter and hardcoded "h3" first, so our wire ClientHello always carried just [h3] regardless of caller intent. quic-go enforces strictly with TLS alert 120 (no_application_protocol, CRYPTO_ERROR 376) when none of the offered ALPNs match its server config — handshake failed at the very first server response against quic-go's hq-interop testcases. Replaced the awkward additionalAlpn shape with `alpns: List<ByteArray>` (default [h3] for backward-compat) and threaded TlsClient.offeredAlpns through. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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Claude
|
ac0d6f06a9 |
fix(quic-interop): detect multiplexing by URL count, not TESTCASE name
The smoking gun from the 2026-05-07 multiplex run boot log: [boot] DEBUG=1; ...; TESTCASE=transfer; ROLE=client [boot] transfer mode: parallel=false urls=1999 quic-interop-runner sets TESTCASE_CLIENT=transfer for ALL the transfer-family testcases (transfer, multiplexing, transferloss, transfercorruption). Discrimination between transfer (1 file) and multiplexing (~2000 files) happens by URL count, NOT by TESTCASE name — so our check `parallel = (testcase == "multiplexing")` was always false, even for the multiplexing test, and we always took the serial fallback path: client.get(authority, path) per URL, opening one stream + awaiting before the next. That's why the wire showed exactly one stream per RTT for the entire 60s. Fix: parallel = (token count of REQUESTS env var) > 1. Effectively: - 1 URL → transfer testcase, serial path - >1 URL → multiplexing testcase, batched-parallel path Verified the writer's batched coalescing already works in unit tests (MultiplexingCoalescingTest, MultiplexingAioquicTpsTest both green at ~9 streams/packet). With this dispatch fix, the live runner should finally reach the batched code path. Bumped WRITER_DEBUG_BUILD_ID so the next [boot] line confirms the fix is deployed. |
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Claude
|
a9dc927cc6 |
diag(quic-interop): log TESTCASE + parallel branch entry
Hypothesis: the [interop] / [batch] logs are missing because we're
hitting the SERIAL branch (parallel=false), not the parallel one —
which would explain perfectly the writer trace pattern:
- streamsView grows by 1 every 2-3 drains
- active stays at 6 or 7 (3 H3 init + at most 4 chunk streams)
- one stream per RTT cadence on the wire
That's exactly what client.get(authority, path) looks like in
sequence. parallel=true would call prepareRequests for chunks of 64.
Two new unconditional log lines (low-volume, control-flow only,
NOT in hot paths):
1. [boot] now includes TESTCASE and ROLE — to verify the runner
is sending TESTCASE=multiplexing as expected
2. [boot] transfer mode: parallel=BOOL urls=N — confirms which
branch we took
If parallel=false despite TESTCASE=multiplexing, the bug is in our
testcase-to-parallel mapping (line 192 of InteropClient.kt).
If parallel=true but [interop]/[batch] still missing, the bug is
elsewhere.
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Claude
|
f13d1ae1eb |
diag(quic-interop): boot log + build-id verify deployed image is fresh
The [batch]/[interop] traces aren't appearing in the user's runs even after rebuild. To distinguish 'env var not set' from 'binary doesn't have the code', emit a [boot] line at startup that: 1. Reports the QUIC_INTEROP_DEBUG env var value 2. Reports whether writerDebugEnabled was flipped on 3. Includes a build-id constant from WriterDebug.kt If the user's run shows '[boot] DEBUG=1; ... build_id=2026-05-07- batch-log-v1', we know the latest debug code IS deployed. If the boot line is missing OR shows an older build_id, the docker image served stale bytecode (gradle/docker layer caching) and a clean rebuild is needed. Inspect script now greps [boot] and surfaces it BEFORE the rest of the writer-side debug section. |
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Claude
|
679bb62a17 |
diag(quic-interop): chunk-size + openBidiStreamsBatch entry/exit logs
Writer trace from the latest run shows streamsView grows by 1 every
2-3 drains, NOT by 64 per chunk. Suggests batching isn't happening,
even though the bytecode confirms openBidiStreamsBatch IS being
called (via javap on the deployed class file).
Two new diagnostic lines per multiplex run, both gated by DEBUG=1:
[interop] multiplex start: total_urls=N MULTIPLEX_PARALLELISM=64
expected_chunks=32
[interop] chunk=0 size=64 starting prepareRequests
[interop] chunk=1 size=64 starting prepareRequests
...
[batch] openBidiStreamsBatch items=64 returned=64
streamsList_before=6 streamsList_after=70
If the [batch] line shows items=1 (instead of 64), the chunked()
call is producing chunks of 1 (would be a bug in MULTIPLEX_
PARALLELISM or chunked semantics).
If [batch] shows items=64 returned=64 streamsList_after=70, then
batching IS working at this layer and the bug is downstream — the
writer is somehow only seeing 1 stream at a time despite 64 being
in the list.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
|
9cd8d0a6ee |
diag(quic): writer-side per-drain stats behind DEBUG=1 build flag
The qlog confirmed the writer emits 1 STREAM frame per packet on the
live wire, while MultiplexingCoalescingTest + MultiplexingAioquicTpsTest
both show ~9 streams per packet under synchronous drain. So the bug is
in the live driver flow — concurrent send loop + parser feed +
real-socket interleaving — and not in buildApplicationPacket itself.
To localize: add an opt-in trace at the END of buildApplicationPacket
that dumps per-drain state when QUIC_INTEROP_DEBUG=1:
[writer.app] frames=N stream_frames=K streamsView=M active=A
packetBudget_remaining=R connBudget_initial=C
- frames vs stream_frames tells us if non-stream frames (ACK,
MAX_DATA, MAX_STREAM_DATA) are bloating the packet
- active vs streamsView tells us if isClosed filter dropped streams
- packetBudget_remaining tells us if we hit the 64-byte break early
- connBudget_initial tells us if conn flow control was zero
Wired three pieces:
1. WriterDebug.kt — a single @Volatile boolean owned by commonMain,
`writerDebugEnabled`. Off by default.
2. InteropClient.main flips it to true if QUIC_INTEROP_DEBUG=1 is set
in the env.
3. Dockerfile + Makefile accept --build-arg DEBUG=1 (or `make build
DEBUG=1`) to bake the env var into the image.
Usage:
cd quic/interop
make build DEBUG=1
cd ../..
./quic/interop/run-matrix.sh -s aioquic -t multiplexing
cat ../quic-interop-runner/logs/run-*/aioquic_amethyst/multiplexing/output.txt | grep '^\[writer'
When off, cost is one volatile read in the writer hot path — negligible.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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|
Claude
|
4616234c82 |
diag(quic-interop): dump first 10 packets fully + add live-driver-flow synth test
Two adds for the multiplex investigation.
(1) inspect-multiplexing.sh: previous histograms aggregate over the
whole run. Add full-frame-array dump of the first 10 packet_sent
AND first 10 packet_received events so we can see whether the
FIRST chunk burst (~13 streams in one packet) or dribbled (1 per).
(2) MultiplexingAioquicTpsTest: synchronous drain test using EXACTLY
the TPs aioquic gave us in the failing run (initial_max_data=1MB,
initial_max_stream_data_bidi_remote=1MB, initial_max_streams_bidi=
128) and ~80-byte HEADERS-frame-sized payloads. PASSES with 7
packets / 9.1 streams per packet — proving the writer's coalescing
is fine under aioquic's flow-control budget. So the bug is NOT in
the writer; it's in the live driver flow that
MultiplexingCoalescingTest doesn't exercise (concurrent send loop
+ parser + real socket).
The first-10 dump from inspect should localize this further:
- if first packet has 13 stream frames → writer burst, bug is
server-side timing or driver-loop scheduling
- if first packet has 1 stream frame → writer producing 1 per call
in production for some condition my synchronous test doesn't
cover
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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|
Claude
|
6bcee12669 |
audit-r2(quic): tighten batched-open API tests + docs
Round-2 audit of the openBidiStreamsBatch / openUniStreamsBatch landing. (1) Tests overpromised. The previous "holds streamsLock for the whole batch" test only verified the API didn't crash and stream ids were unique. A future regression that released the lock between opens (the 2026-05-06 bug shape) would not break it. Added `assertTrue(client.streamsLock.isLocked)` inside both batch init lambdas. Now the test name matches what's verified. (2) `*Batch` docstrings didn't warn that `init` runs under streamsLock. A naive caller might do encoding / IO inside, defeating the lock-hold-time goal that motivated pre-encoding outside. Added the warning + the canonical caller shape (encode outside, enqueue inside) to both function docs. (3) Empty-batch corner: an empty `items` list was still acquiring the lock and entering withLock. Added an `if (items.isEmpty()) return emptyList()` short-circuit. New test pins the contract — `init` must not run for an empty batch. Test count: 6 → 7. All green; no production-API change. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT |
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Claude
|
a0a604b8e7 |
refactor(quic): kill dead levelLock + add bug-resistant batched-open API
Audit follow-up. Two cleanups consolidated into one commit since they
share the goal of "make the lock contract obvious from the API".
(1) Remove LevelState.levelLock entirely.
The lock-split refactor introduced a per-level Mutex with a docstring
claiming the writer/parser would acquire it around encode + sentPackets
record + ACK observation. Neither actually does. SendBuffer's internal
synchronized(this) is what serializes cryptoSend mutations against
takeChunk and markAcked. handlePtoFired's levelLock acquisition was
the only production usage and it serialized only against itself.
Removed:
- LevelState.levelLock
- handlePtoFired's withLock wrapper (now a non-suspend fun)
- All docstring references to a third lock domain
The pre-existing sentPackets HashMap race (writer mutates under
streamsLock, parser reads without sync) is unchanged — out of scope
for this PR. Acquisition order is now `lifecycleLock → streamsLock`,
flat.
(2) Add openBidiStreamsBatch + openUniStreamsBatch — the bug-resistant
high-level API for the prepareRequests / moq audio-rooms patterns.
The previous shape required callers to manually do
`streamsLock.withLock { repeat(N) { openBidiStreamLocked() ... } }`.
That contract regressed twice on this very branch: once held the wrong
lock (lifecycleLock alias), once skipped the wrap entirely. Both shapes
silently emitted one STREAM per packet under multiplex load.
The new API encapsulates the lock + the per-item init lambda:
conn.openBidiStreamsBatch(items) { stream, item ->
stream.send.enqueue(encode(item))
stream.send.finish()
Handle(stream)
}
Callers physically cannot hold the wrong lock. Migrated:
- Http3GetClient.prepareRequests
- HqInteropGetClient.prepareRequests
Also added `openUniStreamLocked` + `openUniStreamsBatch` symmetric to
the bidi versions. moq audio-rooms eventually wants to open many uni
streams in burst; the same one-stream-per-packet bug lurks if every
open serializes through its own lock acquisition.
`openBidiStreamLocked` / `openUniStreamLocked` remain public (with
their `check(streamsLock.isLocked)` guards) for the rare custom-batch
callers that need to mix bidi+uni opens under a single hold. Most
callers should use the *Batch variants going forward.
Test coverage extended:
- openBidiStreamsBatch happy path
- openUniStreamLocked throws without streamsLock
- openUniStreamsBatch happy path
Six tests in BatchedOpenLockContractTest now pin the contract.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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|
Claude
|
07dd572423 |
perf+test(quic): audit follow-ups for the multiplex lock fix
Audit of recent multiplex / PTO commits surfaced three concrete improvements: 1. **Pre-encode requests outside streamsLock** in both prepareRequests impls. QPACK encoding (Http3GetClient) and string formatting (HqInteropGetClient) are non-trivial under multiplex load — 1999 paths means we were holding streamsLock across all 32 chunks × ~2KB of QPACK encoding per chunk = ~64 KB of CPU work serialised against the send loop. Now done outside the lock. 2. **Fix O(N²) byte merging in MultiplexingRoundTripTest.** Previous shape allocated a new array per STREAM frame; for real-size payloads this would dominate test runtime. Switched to a per- stream MutableList<ByteArray> joined once at the end. 3. **Pin coalescing end-to-end in MultiplexingRoundTripTest.** Pre-existing test verified per-stream content arrived but said nothing about the wire shape. Added totalDatagrams ≤ 12 assertion so the matrix's "one stream per datagram" failure mode would break the test instead of passing silently. Audit also surfaced two non-actionable items, flagged for future cleanup but not changed in this commit: - LevelState.levelLock docstring claims writer/parser acquire it around sentPackets mutations; in practice neither does. The handlePtoFired call that takes levelLock currently serialises only against itself; SendBuffer's internal synchronized is what prevents the actual cryptoSend race. Kept the call (matches the documented design intent and future-proofs against the writer actually taking levelLock) but the docstring is stale. - openBidiStreamLocked's check(streamsLock.isLocked) catches "no lock" and "wrong lock" callers but not "another coroutine holds streamsLock and I'm calling without holding it" — kotlinx Mutex doesn't expose owner-aware checks without an explicit owner arg we don't pass. Acceptable since the bug we just fixed and any future regression in the same shape are caught. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT |
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Claude
|
991b1a1da3 |
fix(quic-interop): prepareRequests must hold streamsLock, not lifecycleLock
aioquic interop multiplexing 2026-05-06 qlog post-mortem:
- 2898 packets sent in 60s, each carrying ONE STREAM frame
- server log: streams created/discarded strictly serially, ~30-40ms apart
- 1421/2000 files completed before the runner's 60s timeout
- shape ≈ 1 RTT per stream — wire was emitting one stream per datagram
Cause: Http3GetClient.prepareRequests + HqInteropGetClient.prepareRequests
both did `conn.lock.withLock { ... openBidiStreamLocked() }`. Post the
lock-split refactor `conn.lock` is the deprecated alias for lifecycleLock.
The writer's drainOutbound takes streamsLock — not lifecycleLock — so the
send loop interleaved between every two openBidiStreamLocked calls,
draining one stream's data per pass.
Fix:
1. Both prepareRequests impls now use conn.streamsLock.withLock.
2. openBidiStreamLocked now `check`s streamsLock.isLocked at entry
so this can never silently regress again — calling it without the
lock (or with the wrong lock) throws IllegalStateException with
a message naming streamsLock as the lock to acquire.
3. New BatchedOpenLockContractTest pins the contract:
- calling openBidiStreamLocked WITHOUT any lock throws
- calling openBidiStreamLocked while holding lifecycleLock throws
(the exact regression shape)
- calling openBidiStreamLocked while holding streamsLock works
(happy path)
The runtime check is the regression-proof part: future callers physically
cannot hold the wrong lock without the test (and prod) blowing up at the
first call site.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
|
46926a712b |
test(quic): in-process matrix-shape multiplexing round-trip
The runner's `multiplexing` testcase opens N parallel bidi streams,
each downloading one file, and asserts every file's content lands
on the right stream. Existing tests cover pieces of that:
- MultiplexingThroughputTest: opens 1000 streams in <2s — measures
lock contention but never moves bytes server-side.
- MultiplexingCoalescingTest: pins that 64 streams coalesce into ≤6
packets — encoder contract, no end-to-end.
- MultiStreamFinDeliveryTest: server pushes responses to 50 streams,
client surfaces every FIN — but the CLIENT never sends a STREAM
frame in that test, so any regression in the writer's request-
side multiplex path is invisible.
This test runs the full request → response loop:
1. Open 64 parallel bidi streams
2. Each enqueues a tiny request + FIN
3. Drain client outbound → decrypt → assert all 64 STREAM frames
made it across, with their request bytes intact
4. Server sends one response per stream + FIN
5. Per-stream incoming.toList() must yield the expected response
Failures call out the specific stream id, so a regression points
at "stream X dropped its FIN" instead of a generic timeout.
64 streams keeps wall-clock under a second; the bug class the test
guards against (per-stream loss / mis-routing) fires identically at
64 and 1999.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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|
Claude
|
b579c766a4 |
test(quic): exercise the actual driver PTO path, not a simulation
The existing PtoCryptoRetransmitTest simulated the driver inline: it set pendingPing=true and called requeueAllInflightCrypto by hand, then asserted the next drain emitted CRYPTO. That checked the helpers worked but never noticed when the DRIVER stopped calling requeueAllInflightCrypto — which is exactly the regression that bit us in commits |
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Claude
|
cf2303a38d |
fix(quic): restore PTO CRYPTO retransmit lost in lock-split refactor
aioquic interop multiplexing qlog (the smoking gun):
packet_sent PN=0 Initial frames=[crypto] (ClientHello)
packet_sent PN=1 Initial frames=[ping] (PTO probe — bare PING)
packet_received connection_close 0x0
"Packet contains no CRYPTO frame"
This is the SAME bug commit
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Claude
|
03c00621d6 |
fix(quic): restore Retry fields + LevelState VN reset after lock-split merge
Tier 1 lock-split agent's worktree was based on main and didn't carry
the Retry-handling work (fields retryToken / retryConsumed, applyRetry
method's references to them). Merge with -X theirs nuked those.
Restored:
- retryToken + retryConsumed @Volatile fields on QuicConnection,
re-attached to applyRetry in the lock-split-merged file.
- LevelState.resetForVersionNegotiation now uses pnSpace.resetForRetry()
to reset the PN counter in place — pnSpace is `val` post-refactor,
direct re-assignment doesn't compile. The naming is historical;
the underlying semantics (zero PN counter + clear received side)
are correct for both VN and Retry-with-fresh-PN cases.
- openBidiStream split into the public suspend wrapper +
openBidiStreamLocked() (caller holds streamsLock). Restores the
batched prepareRequests path's ability to open N streams under one
lock hold.
- close() — local var firedQlog hoisted out of withLock block.
Test suite runs clean. Three deprecation warnings remain on
PtoCryptoRetransmitTest + QlogObserverTest still using the
backward-compat conn.lock alias; left for follow-up cleanup.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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|
Claude
|
d920bf8fd0 | Merge branch 'worktree-agent-acb67f8575e4086eb' into claude/research-quic-libraries-hH1Dc | ||
|
Claude
|
ef4bb99988 |
refactor(quic): split conn.lock into streamsLock + per-level lock + lifecycleLock
The single connection-wide `QuicConnection.lock` mutex serialised every
critical path: the read loop's `feedDatagram`, the send loop's
`drainOutbound`, and every public mutator (`openBidiStream`,
`streamById`, `flowControlSnapshot`, ...). The multiplexing testcase
opens hundreds of bidi streams in parallel and was capped at ~25
streams/sec by lock contention against the I/O loops.
Phase 1 of the lock split (see
`quic/plans/2026-05-08-lock-split-design.md`) introduces three
domain-specific mutexes:
- `streamsLock` — streams registry, datagram queues, stream-id
counters, connection-level flow-control bookkeeping, pending-
retransmit maps for control frames
- `LevelState.levelLock` (one per encryption level) — per-level
pnSpace / sentPackets / ackTracker / CRYPTO buffers
- `lifecycleLock` — status transitions, close reason/error code
Acquisition order: `lifecycleLock < streamsLock < levelLock`.
Per-stream `synchronized(this)` blocks inside SendBuffer/ReceiveBuffer
remain at the leaf — never acquire any QuicConnection mutex while
holding a per-stream lock.
The legacy `lock: Mutex` field is preserved as a deprecated alias of
`lifecycleLock` for source-compatibility with external test harnesses;
new code MUST use the appropriate domain lock.
Highlights:
- `feedDatagram` / `drainOutbound` now require the caller to hold
`streamsLock`; the driver wraps each call. Phase 1 keeps the whole
feed/drain inside `streamsLock` for safety; phase 2 (deferred) will
split frame-collection from encrypt + sentPackets-record so app
coroutines can intersperse during the encrypt window.
- `pendingPing`, `peerTransportParameters`, `status`,
`handshakeComplete` are now @Volatile so observers read them
without a lock.
- `markClosedExternally` no longer needs any lock (status is
@Volatile, signals are channel-thread-safe).
- Driver's PTO bookkeeping uses the volatile fields directly — no
lock needed.
- Tests that manually acquired `conn.lock` to call
`getOrCreatePeerStreamLocked` / `onTokensAcked` / `onTokensLost`
now acquire `streamsLock` (the domain those routines mutate).
- New `MultiplexingThroughputTest` locks in the contract: 1000
parallel `openBidiStream` calls must complete in <2 s.
Test plan:
- `:quic:jvmTest` — 294 tests pass (293 prior + 1 new throughput).
- `MultiplexingThroughputTest`: 1000 bidi streams in 52 ms
(~19,000 streams/sec on the in-memory pipe), well above the
250+/sec target.
- `:nestsClient:compileKotlinJvm` — clean, no API breaks.
- `./gradlew :quic:spotlessApply` — clean.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
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57ba23519d |
fix(quic): batch openBidiStream under one lock hold for multiplexing
Diagnosis from yet another qlog round: streams/packet still ~1 even
with the prepareRequest/awaitResponse split. Root cause: openBidiStream
is suspend due to lock.withLock, and each call releases the lock between
iterations. The send loop is queued on the lock; it grabs it the moment
we release, drains the one stream of data we just enqueued, and the
next prepareRequest call has to re-acquire after the send loop releases.
Net: one stream per drain per packet, same useless coalescing as before.
Fix is structural:
- QuicConnection.openBidiStreamLocked() — public, lock-not-acquired
version of openBidiStream. Caller MUST hold conn.lock.
- GetClient.prepareRequests(authority, paths) — batch API that
holds conn.lock once, opens + enqueues all N streams in a single
critical section, releases. Send loop can't interject; when it
next drains it sees ALL N streams' data ready and packs them
into coalesced packets.
- Http3GetClient + HqInteropGetClient: implement prepareRequests
using openBidiStreamLocked under conn.lock.withLock { ... }.
- InteropClient's chunked-multiplex loop: uses prepareRequests
(batch) instead of N x prepareRequest.
Single-stream paths still use prepareRequest / get(); behavior unchanged.
The fundamental architectural improvement (per-stream / per-level lock
split, or actor-model dispatch) is a follow-up; this commit gets us
the throughput we need from the existing single-mutex shape by holding
the lock for the full chunk's worth of work.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
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7ed3d55b31 |
test(quic): pin multiplexing coalescing contract
Two unit tests for the multiplexing throughput problem we just fixed
in the InteropClient (commit
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Claude
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0cc577f0fb |
perf(quic): skip closed streams + skip sort when uniform priority
Multiplexing-throughput investigation (qlog against aioquic):
~25 streams/sec with 1453 GETs in 58s. The bottleneck under high
stream count was drainOutbound's per-call O(N log N) sort over the
ENTIRE stream list (including streams that have already FIN'd both
ways and have nothing to send).
Two cheap optimizations to drainOutbound's stream iteration:
1. Filter to !isClosed streams BEFORE sort. Most streams under
bursty multiplexing loads are done; iterating them is wasted.
2. Skip sortedByDescending entirely when every stream is at
default priority (priority == 0). The pre-priority round-robin
shape (insertion order) is preserved, satisfying the moq-lite
newer-sequence-stream priority contract by happenstance for
uniform-priority loads.
Drops drainOutbound's per-call cost from O(N log N) where N = total
streams to roughly O(active) under realistic loads. Multiplexing's
~2000 streams accumulated over a run drop down to maybe 64 active at
any moment (the chunk in flight).
Doesn't affect the moq-lite audio path's behavior (small N, default
priorities → both paths reduce to the same round-robin walk).
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
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17b80270d9 |
fix(quic): preserve Initial PN namespace across Retry (RFC 9001 §5.7)
aioquic's retry test result, surfaced via qlog: Check of downloaded files succeeded. Client reset the packet number. Check failed for PN 0 Our applyRetry called LevelState.resetForVersionNegotiation, which creates a fresh PacketNumberSpaceState() — resetting PN to 0. The qlog confirmed: PN=0 sent at t=388 (pre-Retry ClientHello), then PN=0 again at t=1468 (post-Retry retried ClientHello). Same PN reused across the boundary. RFC 9001 §5.7 + RFC 9000 §17.2.5: the Initial PN namespace CONTINUES across the Retry boundary. The new Initial keys are derived from the new DCID, but PN doesn't reset. Reusing a PN under different keys makes the runner's pcap-decryption check fail (it's also a security concern in the general case, hence the strict spec rule). Fix: new LevelState.resetForRetry that's identical to resetForVersionNegotiation EXCEPT it preserves pnSpace. applyRetry calls resetForRetry. Two regression tests updated to assert the post-Retry Initial uses PN=1 (continues from PN=0 of the pre-Retry attempt) rather than PN=0 (the buggy reset behavior). For Version Negotiation the original semantics still apply (RFC 9000 §6.2: client treats VN as if the original Initial was never sent; PN reset to 0 is correct). This should bring the retry testcase from ✕(S) to ✓(S) against servers that exercise the Retry path. The handshake / transfer already succeeded over the Retry per the qlog (the server's check "Check of downloaded files succeeded." passed); only the PN-reuse flag was failing the test. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT |
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Claude
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c0d7b6031a |
fix(quic): restore PTO CRYPTO retransmit lost in qlog merge
Direct evidence from aioquic interop qlog:
packet_sent PN=0 frames=[crypto] (ClientHello)
packet_sent PN=1 frames=[ping] (PTO probe — bare PING)
packet_received frames=[connection_close]
reason="Packet contains no CRYPTO frame"
aioquic strictly rejects pre-handshake Initials that contain no
CRYPTO frame. Our PTO probe was a bare PING, not a CRYPTO retransmit.
Agent 2's
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Claude
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77c08ed332 |
fix(quic): restore QuicVersion + ctor params lost in qlog merge
Same merge-from-main shape as the prior agent A integration: the qlog
agent's worktree didn't carry the version-negotiation work (QuicVersion
import, currentVersion / vnConsumed fields, applyVersionNegotiation),
the Retry work (extraSecretsListener / cipherSuites / applyRetry), or
the version-negotiation testcase wiring. Merge with -X theirs took the
qlog version of QuicConnection.kt + QuicConnectionWriter.kt + the
existing InteropRunner.kt wholesale, dropping those.
Restored:
- QuicVersion import in QuicConnection.kt + QuicConnectionWriter.kt +
the test-side InteropRunner.kt (also touched by agent B's qlog
hooks).
- extraSecretsListener / cipherSuites / initialVersion ctor params
on QuicConnection (qlogObserver kept; new qlog work landed).
Net result: all three overnight agents (A versionnegotiation, B qlog
observer, C peer-uni-stream drainer) now coexist on the branch with no
references missing. Full :quic:jvmTest green; :quic-interop:test +
installDist green.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
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Claude
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0107bbbac9 | Merge branch 'worktree-agent-a5e247c7b4025a83c' into claude/research-quic-libraries-hH1Dc | ||
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Claude
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cfc305feb3 |
feat(quic): add qlog observer infrastructure for interop diagnostics
Hooks every QUIC protocol decision (packets sent / received / dropped, TLS key updates, transport params, ALPN, loss detection, PTO, close) into a [QlogObserver] interface. Production callers default to [QlogObserver.NoOp] (zero allocation, single virtual call); the :quic interop runner wires a [QlogWriter] writing JSON-NDJSON (qlog 0.3 / JSON-SEQ format) to `<QLOGDIR>/client.sqlog`, consumable by qvis (https://qvis.quictools.info/) and Wireshark. Goal: every interop-runner test failure produces a qlog file the operator can drop into qvis to see exactly what we did differently from the spec. Hooked call sites: - QuicConnection.start → connection_started, parameters_set(local), version_information - QuicConnection.close → connection_closed(local) - QuicConnection.markClosedExternally → connection_closed(remote) - QuicConnection.applyPeerTransportParameters → parameters_set(remote) - QuicConnection.tlsListener (handshake/app keys) → security:key_updated - QuicConnection.tlsListener (handshake done) → alpn_information - QuicConnectionWriter.buildLongHeaderFromFrames → packet_sent (initial / handshake) - QuicConnectionWriter.buildApplicationPacket → packet_sent (1-rtt) - QuicConnectionWriter.buildBestLevelPacket → packet_sent (close-path) - QuicConnectionParser.feedLongHeaderPacket → packet_received / packet_dropped - QuicConnectionParser.feedShortHeaderPacket → packet_received / packet_dropped - QuicConnectionParser AckFrame loss-detect → recovery:packet_lost - QuicConnectionDriver.sendLoop PTO branch → recovery:loss_timer_updated (pto) |
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Claude
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d0bc998cd2 | Merge branch 'worktree-agent-a4e96f738ceb4bbd5' into claude/research-quic-libraries-hH1Dc | ||
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Claude
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fcfd811545 |
fix(quic): restore Retry handling lost in versionnegotiation merge
The agent A worktree was based on main, so its QuicConnection.kt
didn't carry the Retry handling from
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Claude
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aff2ee182b |
fix(quic): add explicit peer-uni-stream drainer to avoid H3 multiplex tear-down
Variant (B) from the three-way fix menu in the multiplexing-interop investigation: keep `:quic` strict about per-stream backpressure (the audit-4 #3 "INTERNAL_ERROR: stream … consumer overflowed" tear-down stays the contract for app-data overflow on bidi streams) but expose an explicit, opt-in helper for peer-initiated UNI streams that the application has decided it does not need to interpret. Root cause confirmed in QuicConnectionParser.kt:290: when the server opens its three RFC 9114 §6.2.1 peer-uni streams (CONTROL + QPACK_ENCODER + QPACK_DECODER) and the H3 client does not consume them, the parser routes their bytes into each stream's bounded incomingChannel (capacity 64). Once the QPACK encoder issues dynamic-table inserts beyond 64 chunks the next chunk overflows trySend, sets QuicStream.overflowed, and the parser maps that to markClosedExternally — the entire connection dies. Notes on scope: - The `Http3GetClient` and `:quic-interop` runner mentioned in the investigation prompt do NOT exist on the `main` worktree this branch starts from. The fix here is therefore `:quic`-only: the public `awaitIncomingPeerStream` API was already sufficient for an integrator to write the accept loop themselves; this commit wraps the common case in `drainPeerInitiatedUniStreamsIntoBlackHole` and updates the doc on `awaitIncomingPeerStream` so the next integrator landing the H3 GET client doesn't hit the same trap. - Variant (C) — silent default drain in `:quic` itself — was deliberately rejected: defaults that swallow application bytes are the misconfiguration we want type-system-or-API-explicit. The new helper requires the caller to pass a CoroutineScope, so opt-in is unmistakable in any callsite. Regression test coverage in PeerUniStreamDrainTest: - pre_fix_no_consumer_overflows_and_tears_down_connection — pushes 65 chunks (capacity + 1) on a SERVER_UNI stream with no consumer; asserts the connection transitions to CLOSED. Pins the existing backpressure contract. - drainPeerInitiatedUniStreamsIntoBlackHole_keeps_connection_alive — same setup but with the new helper running on a side scope; pushes 256 chunks (4× capacity) and asserts the connection stays CONNECTED. With the helper sabotaged, this test fails at line 119 with status=CLOSED, confirming it actually exercises the fix. Full quic test suite: 295 tests, 0 failures, 0 errors. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT |
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Claude
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04e30465d9 | Merge branch 'worktree-agent-a9d8336181fce16eb' into claude/research-quic-libraries-hH1Dc | ||
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Claude
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350387f7e0 |
feat(quic): handle Version Negotiation packets per RFC 9000 §6
Adds the client-side VN flow needed for the interop runner's `versionnegotiation` testcase: - `QuicConnection` accepts an `initialVersion` constructor parameter (default `QuicVersion.V1`) and exposes a mutable `currentVersion` the writer stamps into outbound long-headers. `start()` now caches the ClientHello bytes for VN-driven re-emission. - `applyVersionNegotiation(supportedVersions)` validates per §6.2 (anti-downgrade: reject if list contains the offered version), picks v1 from the offered set, regenerates DCID, re-derives Initial keys against the new DCID, resets the Initial level via `LevelState.resetForVersionNegotiation`, re-enqueues the cached ClientHello, and latches `vnConsumed` so a second VN is dropped. Failure to find a mutually supported version closes the connection with `QuicVersionNegotiationException`. - `QuicConnectionParser.feedDatagram` detects `version == 0` long headers BEFORE peekHeader (whose layout assumes v1) and dispatches to a new `feedVersionNegotiationPacket` that parses the §17.2.1 shape and validates the echoed DCID. - `QuicConnectionWriter` reads `conn.currentVersion` instead of the hardcoded `QuicVersion.V1`. - `QuicVersion.FORCE_VERSION_NEGOTIATION = 0x1a2a3a4a` for the interop runner. - `InteropRunner` honors `TESTCASE=versionnegotiation` (or `-DinteropTestcase=`) and offers the force-VN version. Regression coverage in `VersionNegotiationTest`: - happy path: VN switches `currentVersion` to v1, regenerates DCID, resets PN, and the next drain emits a v1 Initial on the wire. - downgrade defense: VN listing the offered version is dropped. - unsupported list: VN whose versions we can't speak fails the handshake and closes the connection. - second VN: post-consumption VN is ignored. - DCID mismatch: spoofed VN with wrong echoed DCID is dropped. - backward compatibility: default `initialVersion` keeps v1 behavior for existing callers. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT |
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Claude
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2da5d42d70 | Merge branch 'worktree-agent-a5a40cf58838c96dd' into claude/research-quic-libraries-hH1Dc | ||
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Claude
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39f9ae2aab |
fix(quic): deliver FIN to per-stream Channel under concurrent multi-stream load
When QuicConnection tears down (CONNECTION_CLOSE, read-loop death,
INTERNAL_ERROR from a saturated stream channel, etc.) the per-stream
incomingChannel objects were left open, so any application coroutine
suspended on `stream.incoming.collect { … }` hung forever waiting for
a FIN that would never come. The connection-wide signal channels
(closedSignal, peerStreamSignal, incomingDatagramSignal) all closed
cleanly, but the per-stream Flows did not — surfacing in the
quic-interop-runner `multiplexing` case as 677 collectors stuck after
the connection died mid-response, so zero of the 1999 expected files
landed.
Fix: closeAllSignals() now also calls closeIncoming() on every stream
in streamsList. Channel.close() is idempotent, and consumeAsFlow drains
already-buffered chunks before honouring the close, so any bytes the
parser had already pushed are still surfaced to the collector before
the Flow terminates.
Adds MultiStreamFinDeliveryTest covering: (a) FIN delivery to N parallel
client-bidi streams, (b) connection-teardown unblocks every per-stream
Flow, (c) buffered bytes survive a teardown without an explicit FIN.
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Claude
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671f9c7050 | Merge branch 'worktree-agent-ac6580a9453de5616' into claude/research-quic-libraries-hH1Dc |