Phase 3: /id-sync/1 is used by both range and LogSync handshakes

The range session starts after a Request/Answer on /id-sync/1, and LogSync sends Request first. Confirm one handshake covers both and that a responder answering a method it was not asked for is refused.

id train triage (2026-10-24): needs-decision — project owner: single /id-sync/1 handshake for range + LogSync (confirm one covers both, and unanswered methods are refused).

🤖 Agent note · done

Agent: queue worker (repo-worker-code), Lane B shift
Session / ID: queue task 2022 (triage)
Found via: queue claim
Task: Triage Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179 — /id-sync/1 used by both range and LogSync handshakes
Expectation: Done — verdict: confirmed, half-built at HEAD. Follow-up fix packet enqueued as queue task 2970.
Links: Follow-up task 2970 · pkgs/id/src/log_sync.rs · pkgs/id/src/sync_method.rs · pkgs/id/src/event_sync.rs

Verdict (fresh HEAD reads, this shift)

What is already true:

One ALPN: log_sync.rs SYNC_ALPN and event_store/sync.rs ALPN are both b"/id-sync/1", and log_sync's module doc states the design intent — range sync joins as a method of the same session, first frame is the Request.
One handshake shape covers both methods in sync_method.rs / log_sync.rs: initiator sends Request { topic, method } (SyncMethod::{Log, Range}, chosen by choose()), responder answers Answer::Agree(method) or Answer::Refuse.
The refusal the issue asks about is implemented and tested: the initiator errors when an Answer names a different method than requested (dedicated SyncError variant), the responder sends Refuse for a method it does not support, and a test in log_sync.rs covers "peer answers Range when Log was asked — the initiator must refuse it."

What is not yet true (the confirmed remainder):

run_agreed in log_sync.rs dispatches SyncMethod::Range to SyncError::NotWired, and LogSyncOnly refuses Range — so under the shared handshake, Range is a dead end today.
The /id-sync/1 acceptor serve actually registers (event_sync::EventSyncProtocol for the LocalEvents store, added for id phase-8/platform-completion: ProseMirror save revisions are signed and stored locally but never replicated to peers #792) runs range sessions with no Request/Answer first frame — a second, different session shape on the same ALPN. A peer opening with one shape can be misread by an acceptor expecting the other, instead of refused.

Route: scoped small_fix follow-up enqueued as queue task 2970: wire Range dispatch under the handshake, and bring serve's range acceptor under the same first frame (or split it to a distinct ALPN, documented). Refusal semantics stay as-is.

🤖 Agent note · picked up

Agent: queue worker (repo-worker-code), lane A shift
Session / ID: queue task 2970
Found via: queue claim
Task: Fix Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179 — wire SyncMethod::Range dispatch in log_sync run_agreed under the Request/Answer handshake and end the second session shape on /id-sync/1 (event_sync acceptor speaks the same first frame, or moves to a distinct ALPN with the split documented).
Expectation: branch + PR this shift (CI-first verification); refusal semantics unchanged and tested.
Links: triage verdict: task 2022 on this issue

🤖 Agent note · parked

Agent: queue worker (repo-worker-code), lane A shift
Session / ID: queue task 2970
Found via: queue claim
Task: Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179 — acceptor half DONE as PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 (split onto /id-range-sync/1); task parked on that PR's CI. The run_agreed Range dispatch remains — precise remainder below.
Expectation: resume: (1) merge PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 when its CI is green; (2) implement the remainder; (3) close Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179 via that follow-up PR.
Links: PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 · branch queue/2970-179-sync-handshake · laptop worktree ~/git/fleet/2970-179-sync-handshake

Progress — the two session shapes no longer share an ALPN in `serve`

Done (PR #2214, commit a472fec): the serve-registered range acceptor moved to a distinct ALPN, /id-range-sync/1 — the option this issue's text explicitly allows ("or split it onto a distinct ALPN with the split documented in code"). The split is documented in event_store/sync.rs (module + ALPN docs), event_sync.rs, and log_sync.rs (SYNC_ALPN docs); dialer and acceptor both read event_store::sync::ALPN, so they move together; a peer on an older build fails the dial and serve retries next interval. A new event_sync test pins both ALPN values and asserts they differ. CI on the PR is the verification (fleet CI-first rule); the two-node event_sync tests exercise the new ALPN end to end.

Remainder (why #179 stays open): wiring SyncMethod::Range in log_sync::run_agreed. Verified against current code, this is a design step, not a dispatch arm:

run_agreed(store: &SharedEventStore, topic, method, frames: &mut Frames) holds ONE already-open stream pair; range sync (event_store::sync::run) opens its own stream pair from a Connection and also uses the connection for the pull-gate peer check and cut/close handling. Range sync first needs a stream-level entry point (send/recv + peer id) that both call sites can use.
Range sync needs &mut EventStore for the whole session; SharedEventStore is Arc<RwLock<EventStore>> (std lock, short holds by design — its ingest path deliberately avoids session-length holds, which is why log_sync has an ingest worker). A session locking design is needed (e.g. a tokio-mutex session handle like LocalEvents uses, or a dedicated range_session method on SharedEventStore with documented starvation semantics).
Range sync's set is the whole store; the handshake's Request.topic has no range equivalent yet — the resumed work must say what topic means for an agreed Range session (store-wide, documented, is the honest current semantic).
SyncSupport: whoever registers SyncProtocol in production must then advertise Range; today LogSyncOnly refuses it, which stays correct until the dispatch exists.

Refusal semantics are untouched by PR #2214 and remain tested (log_sync mismatch/refusal tests).

Lane D (queue task 2970) resumed from checkpoint merge_ready. Fresh revalidation 2026-10-29T23:25Z: PR #2214 OPEN/MERGEABLE at 7154a76; all checks SUCCESS except clippy-lint (the failure prior shifts attributed to the #2401 infra pattern; tests incl. test-unit and all shards pass); both Codex inline findings have disposition replies on their threads. Blocker #2403 still open, main still 5a34fa7. Attempting one fresh merge-queue enqueue this shift (another PR is currently queued, so queue health can be observed); if ejected per #2403, the task re-parks.

Lane D (queue task 2970): merge-queue enqueue attempted — PR #2214 entered 23:26:29Z at position 2 behind #2447; by ~23:30Z the queue was empty, PR still OPEN, main still 5a34fa7. Fresh confirmation of blocker #2403 (evidence posted there). Task re-parked. Resume: MQ healthy / main advances → enqueue #2214 → merge → complete fixed_merged + close this issue.

🤖 Agent note · picked up → parked

Agent: queue worker (repo-worker-code), Lane C shift
Session / ID: queue task 2970 (resume, merge_ready), shift 2026-10-29 18:47 CDT
Found via: queue claim
Task: Revalidated PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 fresh: OPEN, MERGEABLE, head 7154a76 unchanged; Codex P1+P2 both dispositioned (design record added; voided tally fixed in 2316d85; unreached Ingest::Voided path filed as id(event_store): no test reaches an Ingest::Voided disposition through a range session #2414). Two checks were red — clippy-lint and the aggregate nix flake check on run 40944390237 — and the failure log is pure infra: Magic Nix Cache throttling (HTTP 418 narinfo downloads, GitHub API rate-limit), not code. Re-ran the failed jobs once (gh run rerun --failed).
Blocker: merge queue stall ci: merge queue ejects every PR — no merge since #2233 (10:57Z), entries dropped 2-6 min into AWAITING_CHECKS #2403 still live (main frozen at 5a34fa7). Parking per fleet consensus — no enqueue into a queue ejecting every entry.
Expectation: resume when main advances / ci: merge queue ejects every PR — no merge since #2233 (10:57Z), entries dropped 2-6 min into AWAITING_CHECKS #2403 closes: confirm the rerun is green, enqueue/merge id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214, close Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179, complete task 2970.
Links: PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 · blocker ci: merge queue ejects every PR — no merge since #2233 (10:57Z), entries dropped 2-6 min into AWAITING_CHECKS #2403

Lane A (queue task 2970): verified terminal state fresh — PR #2214 MERGED 2026-10-30T01:00:10Z (merge commit 88636ed), blocker #2403 CLOSED, main advanced to 7d1b081. The parked resume condition was met and the merge landed under a prior shift; this issue closed 2026-10-30T01:16:04Z. Task 2970 completing as already_done; stale queue/status/work labels removed.
🤖 Agent note · picked up → done (already_done)

Agent: queue worker (repo-worker-code), Lane A shift
Session / ID: queue task 2970 (resume, merge_ready), shift 2026-10-29 21:04 CDT
Found via: queue claim
Task: Revalidate parked merge: PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214 already merged, Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179 already closed, ci: merge queue ejects every PR — no merge since #2233 (10:57Z), entries dropped 2-6 min into AWAITING_CHECKS #2403 closed. No further code work needed.
Links: PR id(sync): split serve range sessions onto /id-range-sync/1 (#179) #2214

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Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179

Verdict (fresh HEAD reads, this shift)

Progress — the two session shapes no longer share an ALPN in `serve`

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Phase 3: /id-sync/1 is used by both range and LogSync handshakes #179

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dezren39 commented on Oct 24, 2026

dezren39 commented on Oct 29, 2026

Verdict (fresh HEAD reads, this shift)

dezren39 commented on Oct 29, 2026

dezren39 commented on Oct 29, 2026

Progress — the two session shapes no longer share an ALPN in serve

86 remaining items

dezren39 commented on Oct 29, 2026

dezren39 commented on Oct 29, 2026

dezren39 commented on Oct 30, 2026

dezren39 commented on Oct 30, 2026

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Progress — the two session shapes no longer share an ALPN in `serve`