feat(sdks): add optimistic updates and the offline write queue to all seven SDKs - #413
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Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review. WalkthroughThe change documents eight SDKs and their offline mutation behavior, clarifies queue eviction callbacks, and updates generated Rust subscriptions to preserve shard keys. ChangesSDK support and behavior documentation
Rust shard routing
Offline queue documentation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The PR adds optimistic updates and offline queuing across the SDKs with the documented checks passing; no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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## alpha #413 +/- ##
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In `@apps/docs/src/content/docs/concepts/server-clients.mdx`:
- Around line 121-123: Update the Non-JS SDKs link sentence to replace “what
each one needs installed” with grammatical wording such as “what needs to be
installed for each one,” while preserving the existing meaning and surrounding
documentation.
In `@apps/docs/src/content/docs/concepts/wire-protocol.mdx`:
- Around line 42-46: Update the introductory SDK count from seven to eight,
keeping the existing wording and the later list of eight SDK suites unchanged.
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apps/docs/src/content/docs/concepts/non-js-sdks.mdxapps/docs/src/content/docs/concepts/server-clients.mdxapps/docs/src/content/docs/concepts/wire-protocol.mdxpackages/client/src/offline-queue.tspackages/codegen/src/sdk/targets/rust.ts
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- packages/codegen/src/sdk/targets/rust.ts
- packages/client/src/offline-queue.ts
… seven SDKs The seven non-JS transports had the wire protocol but neither of the two client-side write features `@lunora/client` ships, so a consumer building on them had no way to show a predicted value or to survive a dropped socket. Both are now ported into every one, held to one shared fixture. - `protocol/fixtures/offline-optimistic.json` carries the values and orderings the ports must agree on (which value is displayed after a rebase, which cursor drops an overlay, which entry an overflow evicts, what a flush leaves queued), and nine new names in `protocol/conformance-cases.json` turn every language red until it covers them. - `optimistic.*` is the cursor-gated, rebaseable layer engine: a frame re-folds the still-pending layers onto the new authoritative base instead of clobbering them, and a layer drops the moment a frame reaches the write's echoed `commitCursor` — never on RPC-response timing, which races the broadcast. - `offline.*` is the bounded, optionally durable FIFO: overflow evicts the oldest, a stale precondition drops a write before it replays, an identity change refuses one, and hydrate restores a prior session's writes ahead of anything queued during the boot window. - `submit` is a new client method rather than a change to `mutation`, which the generated surface calls and which must keep returning a typed result. - Writes carrying an idempotency key now also send `x-lunora-client-id`, so an anonymous caller's de-duplication rows are namespaced per client rather than sharing one key space. `sdks/README.md` records the six deliberate divergences from `@lunora/client` — chiefly that `submit` returns as soon as a write is durably queued instead of staying pending until it replays, because a pending promise is a bad thing to hold on a goroutine or a JVM thread — plus the two browser-only halves that stay unimplemented (multi-tab leader election, batched replay). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01F8wvGajB7PTXFJiiVUmnvZ
…s lock The queue is called with the owning client's lock held — it carries none of its own, deliberately — and settling a write rolls its optimistic layers back, which needs that same lock. Rejecting an evicted write inside the queue therefore re-entered it, and the four lock flavours across these ports failed four ways: - Go: self-deadlock. `sync.Mutex` is not reentrant, so the second offline write past capacity hung the calling goroutine outright. - Ruby: silently swallowed. It raised `ThreadError`, which the queue's own `rescue StandardError` ate — so the evicted write never rolled back and never settled. The mechanism meant to stop an eviction dropping a durable write in silence was itself dropping it in silence. - Java/Kotlin: no hang (`synchronized` is reentrant), but a consumer's callback ran inside the critical section guarding the subscription registry. - Rust/Swift: never expressible, which is why those two were written to return their discards in the first place. All seven now share that shape: `enqueue`, `hydrate`, `drainConflict` and `clear` return the discarded entry with a coded reason, and the client settles it after releasing the lock. The per-entry evict observer is gone — the return value is strictly better, since it cannot be forgotten. Every port gains a case asserting that an eviction raised from inside `submit` settles exactly once with the documented `OFFLINE_QUEUE_OVERFLOW`; on Go that case hangs against the old code, and on Ruby it observes nothing at all. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01F8wvGajB7PTXFJiiVUmnvZ
The generated Rust surface accepted `shard_key` on every subscription and
then discarded it (`let _ = shard_key;`), calling the four-argument
`subscribe` rather than `subscribe_on_shard`. The subscription therefore
registered with no shard, and a write matches a subscription on exactly
that value — so on a sharded app every optimistic overlay from the
generated API was a silent no-op. `None != Some("room-1")`, no error.
The existing guard counted `shard_key` mentions in the emitted surface,
which a parameter that is accepted and thrown away satisfies. Assert
instead that no target discards it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYuhTqTiAJsw5NdF5i1QSQ
Seven defects in the ported optimistic-layer and offline-queue code,
found reviewing the port. Each is fixed in every language it applies to
and asserted from the shared fixture, so a port cannot drift back.
The client id was a per-language constant ("python-client", "go-client",
…). Writes carrying `x-lunora-mutation-id` now also carry
`x-lunora-client-id`, and the shard namespaces anonymous idempotency by
exactly that value. Before, the SDKs sent no such header, the namespace
was undefined, and the idempotency cache was skipped — it failed OPEN.
With a shared constant every anonymous client of a language lands in one
keyspace, so two unauthenticated callers using the same caller-supplied
mutation id collide and the second write short-circuits to the first
one's cached result without ever running. Mint a random id per instance,
as the reference does, and keep the parameter for pinning a device.
The queue was mutated with the client's lock released on every path but
`enqueue` and `clear`. `drain` partitions the item list and then
reassigns it, so a write appended in that window is discarded after
`submit` already returned `queued` to its caller; Java and Kotlin threw
ConcurrentModificationException out of the flush instead. Go's race
detector reports it and the accounting proves it — entries drained twice
off a stale slice. Every mutation now runs inside the critical section.
A hydrated write evicted on overflow settled to nobody. Discards were
reported through the entry's own reject handler, and a write restored
from durable storage has none — nobody is awaiting a write submitted in
a previous process — so the eviction un-persisted it and reported
nothing. Discards now reach the client-level listeners unconditionally,
with `hadAwaiter` read from the entry rather than restated as a literal.
`cursor` is optional on data/delta/resume frames, but five ports assigned
it unconditionally, so a legal cursorless frame reset the tracked cursor.
A later confirm cannot compare against it, keeps the layer, and the write
renders twice. Assign only when the frame carries one.
A write whose args cannot be wire-encoded looped forever: a codec error
has no code, so it classified as transient, re-queued at the front, and
blocked every write behind it while never settling its caller. Partition
on encodability before the replay loop and settle those terminally.
An empty shard key and an absent one are the same shard everywhere the
client matches a subscription or drains the queue — but the runtime
takes any string as a named shard, so sending `""` routed the write to
its own Durable Object. Normalising only the comparisons would have been
worse than the original bug: the write would now drain and then replay
against a different shard from the subscription it updated. Normalise at
the wire too, so `""` never leaves the client.
Consumer callbacks ran under a non-reentrant lock. Transforms and
preconditions now run against a snapshot with the lock released, and it
is taken only to install the result, so a callback may re-enter the
client. Two exceptions remain and are documented rather than hidden: a
transform re-run when a frame re-folds pending layers, and the
persistence adapter and queue observers. Both need per-state locking.
Also: the write path moves out of the client files (Java 1446 -> 994,
Python 1161 -> 739, Swift 1022 -> 734, Kotlin 968 -> 639); `drainConflict`
and `clear` are expressed over `drain` and take stale ids so no consumer
code runs locked; the optimistic suites drive the real frame handler
instead of a transcription of it, which is what let the cursor defect
hide; and Swift's `snapshot()` is renamed `items()` to match the other six.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WYuhTqTiAJsw5NdF5i1QSQ
The dart transport landed on alpha with its own optimistic-layer engine and offline queue, asserted against inline expectations. This branch added names to protocol/conformance-cases.json, and dart's suite enforces that file like every other — so the merge turned it red on all twelve. Dart now asserts the same protocol/fixtures/offline-optimistic.json values its seven siblings do, driving the engine directly where the fixture asserts layer counts, the client where the behaviour is the frame handler's, and the replayer for the flush paths. Three things had to change for it to be able to: - The identity stamp was two-state. A nullable field cannot separate "queued while signed out" from "persisted before stamps existed", and toJson omitted the key on null, so the two collapsed on the wire. PersistedMutation and QueuedMutation now carry identityStamped alongside identity, the persisted form writes an explicit null for a signed-out write, and fromJson keys the distinction on the key's PRESENCE. Unreachable in practice today - dart has no records written before stamps existed - but it is the rule the reference client and the other seven ports implement, and the fixture requires it. - An unencodable queued write settled as BAD_REQUEST. It is now OFFLINE_WRITE_UNENCODABLE, the code the sibling ports settle it with. - offline_queue_fifo_and_shard_drain is now offline_queue_fifo_replay_order. A manifest name is required of every port, so it may only assert behaviour every port has, and dart's single connectivity signal gives it one drain rather than a per-shard one. The seven still assert the shard predicate inside that case; the difference lives in the capability matrix, which is where batched replay - dart's alone - already sits, and which now carries a per-shard drain row. Dart already guarded the cursorless-frame and hydrate-overflow defects the sibling ports were repaired for; both now have a case rather than an implementation that happens to be right. Verified: all eight suites and every lint leg pass locally except swift, whose toolchain will not install through this environment's proxy; its change here is the mechanical rename.
Three pages told readers the opposite of what ships. `server-clients` and `non-js-sdks` both said optimistic updates and the offline queue were JS-only (later JS-and-Dart-only). All eight generated clients carry both now, so the pages say which surface reaches them — `submit` everywhere except Dart, which rides the generated mutation — and what genuinely is missing everywhere, which is multi-tab leader election. `wire-protocol` and `server-clients` still enumerated seven languages and omitted Dart, which landed on alpha. Both now say eight, and the "needs nothing installed" count moves from five-of-seven to six-of-eight. The Dart-only list shrinks to what is actually Dart's alone — a subscription as a Stream, and batched replay — and gains what only Dart lacks, a per-shard drain. The optimistic example is paired with the `submit` form so the feature does not read as Dart's.
Only `sdks/python` had one, so seven of eight transports were documented nowhere but the contributor-side `sdks/README.md` — which is about how the ports fit together, not how to use one. Each new README follows python's shape: what the transport implements, what the consumer must install and how to wire it up, the write path with a worked example, that language's wire-type table, and how to run its suite. Every API name in them was read off the source rather than assumed. Where a language earned an extra section it gets one, because those are the things a reader hits first and finds least documented: Go's two-package layout and the redeclarations that forced it, Rust's `(subscription id, layer id)` settle handle and up-front patch set, Swift's `JSONEncoder` nil-omission and the SwiftPM directory-name identity, the JVM pair's hand-emitted models, and Dart's `Stream` subscriptions plus the two quicktype repairs. `sdks/README.md` gains a pointer to all eight and says plainly which side of the line it is on. These live at each SDK's ROOT, which no target vendors — every `vendor` entry names a subdirectory (`lunora/`, `lib/`, `src/`, `Sources/Lunora`) — so none of this reaches a user's generated output.
A write whose query result comes out byte-identical makes the shard emit a `settled` frame (or a `resume` after a reconnect) rather than a `data` frame: the value did not change, only the cursor. Seven of the eight ports dropped confirmed optimistic layers on `data`/`delta` frames alone — their `resume`/`settled` arms advanced the resume watermark and nothing else — so such a write left its prediction on screen. The failure is permanent, not transient. Nothing re-sweeps until some unrelated write happens to change the same query, which on a quiet query never happens, and a reconnect cannot recover it either: the resume watermark has already moved past the write, so the server correctly re-sends nothing. Each port's `resume`/`settled` arm now mirrors the data arm's tail — advance the tracked cursor when the frame carries one, drop the layers it has caught up with, and re-fold and notify only when something was actually removed. Dart already did this and is unchanged. Two cursor narrowings ride along, being the same defect (a bad cursor stranding every pending layer): Kotlin nulled the tracked cursor on an explicit `"cursor": null`, and Python assigned it unnarrowed, so a non-integer cursor raised out of the sweep. The 8-language gate was blind to all of it because the fixture only ever drove `data` frames. `settledFrameDrop` in protocol/fixtures/offline-optimistic.json and `optimistic_layer_drops_on_settled_frame` in the required manifest now force every port to carry the case.
The Kotlin replay loop caught `RuntimeException` around the poster call, but a poster is a bare Kotlin function type with no exception discipline and every realistic one — HttpURLConnection, OkHttp — throws a checked `IOException` on a dropped connection, which is the canonical transient failure the loop exists to survive. `IOException` is not a `RuntimeException`, so it escaped `flushOfflineQueue` after `drain` had already removed the writes. Nothing requeued them, nothing settled them, nothing un-persisted them: with the default in-memory queue every unreplayed write was destroyed, no `onSettled` fired, optimistic overlays were never rolled back, and the pending count silently dropped to zero. The catch widens to `Exception`, `Client.isTransient` takes `Exception`, and `MutationSettled.error` / `settleWrite` widen with it so a checked failure can be reported rather than merely caught. A case with an `IOException` poster asserts the whole backlog returns to the front of the queue in order.
Go and Python read the closed flag on the way into submit and released the lock before deciding to queue. A close landing in that gap takes the lock, clears the sender and drains the queue; the submit then re-takes it, sees no sender, and enqueues into the queue that was just emptied. Nothing ever flushes a closed client, so that write is never sent, never settled, and its optimistic overlay is never rolled back — while submit has already told the caller it is durably queued. Both now decide it in the same critical section as the enqueue, which is what Java, Kotlin, Ruby and Swift already did. Go rolls its layers back on the way out, since they are installed before the lock; Python raises before installing any. Go asserts it under a Close/Submit race loop; Python drives the close from inside an optimistic_update, which runs in exactly that window.
`random_id` drew a fresh `RandomState` per call. That type seeds its key from the OS once per thread and then bumps it by one per call, so successive ids on a thread were SipHash of a known counter under linearly-related keys — an observer who had seen a few could narrow the next. That is reachable. For an unauthenticated caller the server keys its idempotency cache by `(x-lunora-client-id, x-lunora-mutation-id)`, both attacker-settable plaintext headers. Predicting a victim's next mutation id is enough to pre-POST a write under it, after which the victim's real write short-circuits to the attacker's cached result: reported committed, never executed, optimistic overlay confirmed. A durable queued write replayed after a restart carries its persisted issuing client id, so it is exposed the same way. The key is now drawn once per process and held, leaving the counter as the only varying input, so predicting an id means recovering that key from its outputs. No new dependency. The doc comment says plainly that this is a keyed PRF and not a CSPRNG, so a caller needing an unforgeable capability draws its own. Uniqueness is now also asserted across threads, since a per-thread key would be the regression.
Java's and Swift's `drainConflict` evaluated each queued write's `precondition` inline, inside the queue mutation. Their five siblings take a pre-computed id set instead, and sdks/README.md states the rule without exception: nothing the consumer supplies runs while the client holds its lock. Neither client used the inline form — both compute the verdicts first and drain on them — but it is public API, so a consumer reaching for the obviously named method runs its own predicate inside the lock that guards the subscription registry, stalling the socket read loop, and deadlocks outright if that predicate reads the client back. Both now take `stale` like the other five, so the surface is identical across all eight ports and cannot be misused into the lock.
The reconnect path's comment said the backlog goes out "in order, before anything new is submitted". Nothing enforces the second half: `attach_socket` runs before the flush, so the queue-it decision is already false and a `submit` racing the flush goes straight over HTTP, past a backlog still replaying. Last-writer-wins then hands back the stale value. The window is in the reference client too, so this states what actually holds — the backlog is ordered among itself — and names what closing it would take.
Ruby and Kotlin took `maxItems` verbatim where the other five clamp it to at least one. With a cap of zero, `enqueue` appends and the overflow sweep drops the same write in the same call: every submit reports "queued" and then settles OFFLINE_QUEUE_OVERFLOW, so a queue that cannot hold anything reads as a working one that rejects everything. Both now clamp, and both assert it. Rust re-exported four of the five offline codes from the crate root, so a consumer matching on them hit a compile error on CODE_OFFLINE_WRITE_UNENCODABLE alone; it is exported with its siblings now. The wire-protocol page still said seven SDKs ship where the rest of the same page says eight.
`submit.py`'s eleven free functions took `client: Any` and reached through it into `_lock`, `_closed`, `_send`, `_was_ever_connected`, `_subs`, `_settled_listeners` and `_rpc_full` — about forty attribute accesses a checker saw as `Any` and therefore checked not at all, so renaming any of them was silent. They now annotate `client: LunoraClient`, imported under TYPE_CHECKING because `client.py` imports this module at run time. The absent-vs-empty shard comparison was inlined at five sites as `(sub.shard_key or "") == key`, the one comparison where a strict check strands a write in the queue forever. It is now `same_shard` beside `identity_allows_replay`, matching the named predicate its siblings carry.
`Offline.swift` opened with five prefix-namespaced globals — an Objective-C convention in a language that has had namespacing since 2014 — and then contradicted itself twenty lines later with a properly modelled `enum LunoraIdentity`. The five codes and the transient set are now `LunoraOfflineCode`, a caseless enum. `lunoraIdentityAllowsReplay(stamped, current)` becomes `stamped.allowsReplay(under: current)` on the sum that already declares the three cases the switch inspects. `lunoraShardKey`, which every call site had to invoke twice to make one comparison, becomes the `lunoraSameShard` predicate its five siblings carry.
The stamp is a three-case value — unstamped legacy record, signed out, subject — and two ports named it in a way that says nothing. Rust spelled it `Option<Option<String>>`, so the gate had to match `None`/`Some(None)`/`Some(Some(_))` and a doc comment had to explain which nesting meant what. It is now a three-variant `enum Identity` with an `Identity::stamp` constructor, and the explanation is the variant names. Python's alias for the sum was literally `Any`, so `identity_allows_replay` type-checked against every argument in the language. It is now `Union[str, None, _AbsentIdentity]`; the sentinel class already existed.
Kotlin's encodability partition discarded the codec's exception and settled every unencodable write with the same fixed "arguments cannot be wire-encoded". Which cap was exceeded — depth, bigint digits, an unsupported type — is the only thing that tells a consumer what to change about a write that can never be sent, and Go and Python already include it. Ruby's `LocalStore#get_all_queries` returned the subscriptions' displayed values raw while `get_query` consulted this batch's overrides. An `optimisticUpdate` that patches every variant of a list query and then reads it back therefore composed its next step onto the value it had just replaced.
Go exported `Client.ClientID` and `Client.Identity` as plain mutable fields while the write path read them under the mutex — `newQueuedWriteLocked` binds every queued write to whatever it finds there, and the flush snapshots the identity under the lock. A consumer assigning `client.Identity = &subject` from a sign-in handler on another goroutine is the ordinary case and is a data race their own `go test -race` reports against this package. Both are unexported now, behind lock-guarded `ClientID`/`SetClientID` and `Identity`/`SetIdentity`, and `rpcFull` reaches the id through the accessor. Ruby had the same split: `attr_accessor :identity` was unsynchronised while `flush_offline_queue` snapshots `@identity` under `@mutex`. It is now a reader and writer pair taking that same mutex.
The fixture file exists so eight ports assert one set of numbers rather than each documenting its own, but nothing checks that a port actually reads it. Measured, seven ports read every scenario and dart read only the ones the required-case manifest happens to name — it asserted requeue, clear, the declining layer, a cursorless confirm and the constant mask against numbers written in its own test file instead. Dart now reads eighteen of nineteen scenarios. The nineteenth is `shardDrain`, which it legitimately has no per-shard drain to exercise; that one is already a documented gap in the capability matrix.
The nine names added for the write-feature cases went in at four spaces under a six-space block, so `prettier --check .` failed on the manifest alone. Reindent to match; no case names change.
"what each one needs installed" is a double modal that only reads in some dialects. Say "what needs to be installed for each one".
`PersistenceAdapter`'s four methods used one-line `...` bodies, which the static analyzer reports as an expression statement with no effect. `pass` carries the same "intentionally empty" meaning and is recognised as such; the Protocol semantics are unchanged.
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The row marked ruby, rust and swift as not sending a required `v.nullable()` as a present null. The prose directly under it says all eight get it right, and that is the accurate half: `ModelNullPaths` in `packages/codegen/src/sdk/ spec.ts` computes the paths, the three call sites pass them, and `sdk-nullable-args.test.ts` asserts each one emits them. The row predates that machinery and was never updated with it — the exact drift the section above the table exists to prevent.
Dart took a single `setConnected(bool)` and drained the whole queue on it, so a sharded app replayed every shard's writes down whichever socket happened to come back — writes for a shard still offline went out over a connection that cannot reach them and came back as transport failures. `setConnected` and `flushOfflineQueue` now take a shard key, the queue's `drain` takes a predicate, and connectivity is a set of connected shards rather than one flag. `buildRpcBody` and `wsUrl` drop an EMPTY shard key the way the other seven do: the runtime routes `""" to its own Durable Object, so sending it would split the client's view (where `""" and null are one shard) from the server's. `offline_queue_drains_only_the_named_shard` is now a required conformance name. The `shardDrain` fixture already existed and seven ports already read it — as part of the FIFO case, so nothing failed when the eighth did not.
Seven ports replayed a queued write per HTTP round trip, so a reconnect after a long offline session cost N hops where the reference client and dart cost a handful. They now share the same rule: a lone write rides the single-call path, two or more coalesce into `POST /_lunora/rpc-batch` chunked at the server's own 500-entry cap, and the chunks go out sequentially so FIFO survives a flush longer than one batch. The idempotency key and the client id ride in each ENTRY rather than in a request header, because a batch is one hop carrying independent calls and a single outer header would de-duplicate the whole chunk against one write. Slot classification mirrors the single-call path, plus the one rule only a batch can express: a slot carrying `SHARD_ERROR`/`SHARD_UNAVAILABLE` is not a verdict, so that write is re-queued rather than reported as failed. A slot the server never returned is retried too — it may or may not have committed, and the key makes that safe. `offline_flush_batches_multiple_writes` is a required conformance name reading a new `batchReplay` fixture, so the round-trip count, the per-entry envelope and the transient-slot rule are asserted in all eight rather than described. The existing flush case now drives the batch transport in every port, mapping its `transport-error` outcome onto an absent slot the way dart already did.
Seven ports offered a live query only as a callback registration, so a consumer wanting a loop had to build the buffer, the teardown and the ordering itself — and get all three right. Each now ships the same query in its own PULL type: an async generator in python, a receive channel in go, an `Enumerator` in ruby, an `mpsc::Receiver` in rust, an `AsyncStream` in swift, a closeable `Iterable` in java, a closeable `Sequence` in kotlin. Dart already had `watch`. Every one opens its OWN subscription at CALL time rather than on first pull, so a frame arriving before the loop starts is not lost, and tears it down when the consumer is finished — cancelling, breaking, closing. Errors travel in the same channel as values rather than a second one, because a consumer reading two of them can read them out of order and a stream's whole promise is that what arrived first is delivered first. No new dependency anywhere: the JDK ports use `LinkedBlockingQueue`, rust uses `std::sync::mpsc`, kotlin gets a `Sequence` rather than a `Flow` (which lives in kotlinx-coroutines). `subscription_stream_yields_frame_values_in_order` is a required conformance name reading a new `stream` block in `ws-frames.json`: the eight agree on the values and their order even though the types cannot match.
`Stream` captures the enclosing `Client` for nothing — it reads only its own queue and the `StreamEvent` beside it — so every open stream pinned a client that could otherwise be collected. Static in java, a plain nested class in kotlin; a nested class keeps private access to the enclosing type either way, so `stream()` still fills the queue directly.
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Summary
The seven non-JS transports in
sdks/*had the wire protocol but neither of the two client-side write features@lunora/clientships, so a consumer building on them had no way to show a predicted value or to survive a dropped socket. Both are now ported into every one, held to a single shared fixture.Optimistic updates are cursor-gated and rebaseable (
optimistic.*, ported frompackages/client/src/optimistic-layers.ts). A transform is recorded as a LAYER on its subscription rather than written once and forgotten, so an incoming frame re-folds the still-pending layers onto the new authoritative base instead of clobbering them — a queued write's predicted value survives an unrelated delta on the same query. A layer drops the moment a frame whosecursorreaches the write's echoedcommitCursorarrives, so the confirming frame cannot double-count it. The drop keys on the server's cursor, never on RPC-response timing, which races the socket broadcast.The offline queue is a bounded, optionally durable FIFO (
offline.*, fromoffline-queue.ts). Writes made while the socket is down replay in submission order once it returns, each under its ownx-lunora-mutation-idso the server de-duplicates one it already committed. Overflow evicts the OLDEST entry; a stale precondition drops a write before it replays; an identity change refuses one; a flush classifies each reply — success confirms the overlay, a coded verdict is terminal, a transient failure re-queues that write and every unreplayed one, in order.submitis a new client method —mutationis untouched, because the generated surface inpackages/codegen/src/sdk/targets/*calls it and a typed wrapper must keep returning a typed result.One correctness fix rides along: writes carrying
x-lunora-mutation-idnow also sendx-lunora-client-id. Without it, anonymous clients share one server-side de-duplication key space, so a colliding mutation id could suppress another client's write.Cross-port agreement is enforced, not asserted
protocol/fixtures/offline-optimistic.jsoncarries the values and orderings all seven must agree on — which value is displayed after a rebase, which cursor drops an overlay, which entry an overflow evicts, what a flush leaves queued. Nine new names inprotocol/conformance-cases.jsonturn every language red until it covers them. The mechanics are hand-coded per language (a transform is a closure, and closures are not data), but every assertion reads its expectation from that file.The second commit is a real bug found reviewing the first
The queue rejected discarded writes in place, while the client's lock was held — and settling a write rolls its optimistic layers back, which needs that same lock. Every eviction re-entered it, and the four lock flavours failed four ways:
sync.Mutex(non-reentrant)Mutex(non-reentrant)ThreadError, which the queue's ownrescue StandardErrorate — so the evicted write never rolled back and never settled.synchronized(reentrant)&mut self, SwiftNSLockThe Ruby failure is the instructive one: the mechanism meant to stop an eviction dropping a durable write in silence was itself dropping it in silence. All seven now share the Rust/Swift shape —
enqueue,hydrate,drainConflictandclearreturn the discarded entry with a coded reason, and the client settles it after releasing the lock. The per-entry evict observer is gone; a return value cannot be forgotten.Touched areas:
sdks/{python,go,ruby,rust,swift,java,kotlin},protocol/, and two smallpackages/*changes described under "Review fixes" below (one real codegen bug, one comment).@lunora/client's behaviour is untouched — it is the reference.Linked issues
Test plan
./sdks/run-all.sh— PASS for python, go, ruby, rust, java, kotlin./sdks/lint-all.sh— PASS for python, go, ruby, rust, java, kotlinprotocol/conformance-cases.jsonnames (the manifest gate fails the suite otherwise)submitsettles exactly once withOFFLINE_QUEUE_OVERFLOW— that case hangs against the pre-fix Go code and observes nothing against the pre-fix Ruby codedownload.swift.org; a toolchain (Swift 6.3.3, swift-format 6.3.0 against the 6.3 pin) was available for the review-fix pass, soswift build/swift test/swift format lint --strictall ran and pass.pnpm exec prettier --checkon the changed JSON/Markdownpackages/codegenchanged, so its suite was run (1210 tests, green) along withsdks/generated-check.sh, which generates each SDK into a scratch dir and then builds and CALLS it — the gate that actually exercises the emitted Rust. Thepackages/clientchange is a comment, so no public surface moves andapi:check/dist:checkare unaffected.Checklist
feat(scope): subject)apps/docs(orREADME.mdfor package-local docs) —sdks/README.mdandsdks/python/README.mdpackage.jsonfiles inpackages/*modified outside the touched package — none modified at allproject.jsonhastype:packageand acategory:*tag — no new packagessubmitis additive andmutationis unchangedReview fixes (second round)
A two-pass audit of the first revision found seven defects in the ported write
path. Each is fixed in every language it applies to, asserted from the shared
fixture, and covered by a case that was checked to fail against the old code.
"python-client", …)anon:<clientId>). Before this PR the SDKs sent nox-lunora-client-idat all, so the namespace was undefined and the cache was skipped — it failed OPEN. A shared constant puts every anonymous caller of a language in ONE keyspace, so two unauthenticated users passing the same caller-supplied mutation id collide and the second write short-circuits to the first's cached result without running. The header was added as a correctness fix in the first revision; with a constant it created the collision it was meant to prevent. Now random per instance, matching the reference.drainpartitions the item list then reassigns it, so a write appended in that window is dropped aftersubmitreturnedqueued. Java/Kotlin threwConcurrentModificationExceptionout of the flush instead. Go's race detector reports it, and the accounting proves it (entries drained twice off a stale slice).onEvictfires from the hydrate path for exactly this reason; the ports replaced that observer with a return value and wired it only into the per-entry handler.cursoris optional on data/delta/resume frames. Nulling it means a later confirm cannot compare, keeps the layer, and the write renders twice.code, so it classified transient, re-queued at the FRONT, and blocked every write behind it while never settling its caller.""and absent were different shards in five ports""never replayed. Note the fix had to go further than the report: normalising only the comparisons would have been WORSE, since the runtime takes any string as a named shard — the write would drain and then replay against a different shard from the subscription it updated.""is now normalised at the wire too.Two
packages/*changes ride along:packages/codegen/src/sdk/targets/rust.tsemittedlet _ = shard_key;— the generated Rust surface accepted a shard key on every subscription and discarded it, so on a sharded app every optimistic overlay from the generated API was a silent no-op. The existing guard countedshard_keymentions, which a discarded parameter satisfies; it now asserts no target discards it.packages/client/src/offline-queue.tsgains a comment only. The reference is correct as written and deliberately keeps the callback form the ports rejected — worth recording so it is not "simplified" into the bug the ports just fixed.Structural work from the same audit: the write path moved out of the four client files that had grown past or near 1,000 lines (Java 1446 → 994, Python 1161 → 739, Swift 1022 → 734, Kotlin 968 → 639);
drainConflict/clearare expressed overdrainacross all seven; the optimistic suites now drive the real frame handler instead of a hand-copied transcription of it — which is precisely why the cursor defect had no test; and Swift'ssnapshot()is renameditems(), the last name that had drifted from the shared queue surface.Known residual, documented rather than fixed: an optimistic transform is still re-run under the lock when a frame re-folds pending layers, as are the persistence adapter and the queue's size observer. The fold produces the value the frame delivers and needs a stable base, so making these lock-free needs per-state locking rather than one client lock.
sdks/README.mdstates the exact contract: a transform must be pure and must not re-enter the client, and a violation surfaces on the next frame rather than atsubmit.Notes for reviewers
Start with
sdks/README.md. It records the six deliberate divergences from@lunora/clientand the two browser-only halves left unimplemented (multi-tab leader election, batched replay over/_lunora/rpc-batch), both now❌rows in the capability matrix.The divergence most worth a second opinion:
submitreturns as soon as a write is durably queued (status: "queued"), rather than staying pending until it replays the way the browser client's promise does. A pending promise is fine in an event loop and bad on a goroutine, a Ruby thread or a JVM thread pool, so the eventual verdict arrives throughonSettled/onMutationSettledinstead. A caller that must not report success early checksstatus.Two smaller judgement calls:
client.identity), not derived from the auth token. These SDKs do not manage auth sessions, and deriving it would mean persisting a hash of a bearer token in the consumer's storage. It is documented as non-secret.SHARD_ERROR/SHARD_UNAVAILABLEre-queues, everything else coded is terminal. That is the reference client's own batch classification; its single-call path drops on any coded error, which loses a durable write to a shard blip. The ports take the better of its two.Rust and Swift carry one shape change apiece, both forced by the language rather than chosen — a
(subscription id, layer id)settle handle and anOption-returning transform in Rust, an unlocked queue in Swift. Both are explained inline and in the README.Note that CodeRabbit skipped this PR entirely: all 47 files fall under its default path filters, so no automated review ran on any of it.
Summary by CodeRabbit
New Features
Documentation
committedorqueuedstatuses.