perf: bound the orders subscription replay with a persisted since cursor - #708
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The orders filter (kind 14) carried no since or limit, so every (re)subscription - cold start, resume, relay recovery, node switch - replayed the node's full message history from every relay, each replayed event costing a dedup read on the UI isolate. kind 14 events carry real timestamps, so the chat cursor pattern applies: - New orders_since_ cursor namespace (keyed by node pubkey) on the existing ChatCursorStore, warmed before the filter is built. - buildOrdersFilter's nip44 branch takes since (cursor minus overlap, falling back to the default lookback on fresh installs - older history is served by the restore flow) and a limit. The legacy 1059 branch stays unbounded: gift wrap timestamps are randomized. - MostroService advances the cursor in _markEventProcessed, so events deliberately left unprocessed (no matching session yet) stay inside the cursor's overlap window and can be retried by a later resubscription. - Cursor access is best-effort: storage failures fall back to the default lookback instead of blocking the REQ.
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WalkthroughOrders subscriptions now persist a per-node event cursor. NIP-44 order filters use that cursor and a limit. Gift-wrap filters remain unbounded because their timestamps are randomized. ChangesOrders cursor filtering
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to The new bounded replay can miss order messages when event processing, persistence, or transport changes occur because the replay cursor may advance past events that still need processing. This can prevent users from receiving trade updates after reconnects or switching protocols, so the cursor write ordering and transport scoping should be fixed before merge. Sequence Diagram(s)sequenceDiagram
participant MostroService
participant ChatCursorStore
participant OrdersSubscription
participant buildOrdersFilter
MostroService->>ChatCursorStore: Advance orders cursor with event timestamp
OrdersSubscription->>ChatCursorStore: Read cached cursor
OrdersSubscription->>buildOrdersFilter: Pass cursor timestamp
buildOrdersFilter-->>OrdersSubscription: Return bounded NIP-44 or unbounded gift-wrap filter
Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (4 skipped: 4 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@lib/services/mostro_service.dart`:
- Around line 127-130: In the event-processing flow around the unawaited
ordersCursorStoreProvider.advance call, await the putItem marker write before
starting the best-effort cursor update. Preserve the existing event timestamp
and cursor parameters, and only launch advance after the marker write completes
successfully.
- Line 130: Update the cursor advancement in _markEventProcessed so
_settings.mostroPublicKey is advanced only when event.kind == 14; do not use
kind-1059 timestamps for this NIP-44 cursor, while preserving existing
processing for both event kinds.
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📒 Files selected for processing (4)
lib/features/subscriptions/subscription_manager.dartlib/services/chat_cursor_store.dartlib/services/mostro_service.darttest/features/subscriptions/orders_filter_test.dart
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Review follow-ups on the since-cursor bounding: - Bootstrap window: with no stored cursor the filter fell back to a flat 7-day lookback, so the first launch after upgrading could silently omit responses to orders older than that (non-terminal orders live well past 30 days, and normal startup never runs the restore flow). The fallback now also reaches back to the oldest live session — no message of an active order predates its session — while a fresh install keeps the default lookback. - Marker before cursor: the cursor advanced before putItem resolved, so a failed marker write could leave an event unmarked *and* outside every later replay. The durable marker is written first. - Transport scoping: gift wrap (1059) timestamps are randomized, and this cursor feeds the kind-14 filter only. Only kind 14 advances it now. - Contiguity: the node-wide cursor could step over one trade's still unprocessed event when another trade's newer one was processed. Events left unmarked now hold the cursor back until they are retried, bounded by a 1-hour hold so an event that can never be processed cannot freeze the replay window. Also fixes dispute_chat_duplicate_envelope_test, which failed on main too: chatUnwrap now verifies and decrypts on a worker isolate, whose spawn takes real wall-clock time, so draining the event queue could return before the valid envelope was accepted. It polls for the result instead.
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Pushed d4abba6 with the review follow-ups (replied inline on each thread) plus the red CI check. Review fixes
CI New tests: |
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Request changes — the design is solid and the bot findings in d4abba6 are genuinely addressed, not papered over. Two things to fix first.
- The new regression test is flaky (blocking)
test/services/mostro_service_orders_cursor_test.dart:121 uses a fixed await Future.delayed(100ms) to sync, but the assertion at line 130 reads a value written at the end of an unawaited chain: NIP-44 decrypt on a worker isolate + Sembast write + SharedPreferences write. 100 ms is not enough headroom.
Reproduced locally:
- 1 failure in 15 runs of the file alone on an idle machine
- 4/4 failures with the machine under CPU load (8 spinning processes)
00:14 +0 -1: a processed kind-14 event advances the orders cursor [E]
Expected: not null
Actual:
test/services/mostro_service_orders_cursor_test.dart 130:5
CI runners are loaded, so this will go red intermittently. This is the test that protects the PR's central guarantee — once it flakes, it gets ignored or deleted and the guarantee loses its net.
The fix is already in this PR: apply the same _waitFor polling helper you added to dispute_chat_duplicate_envelope_test.dart instead of the fixed delay. That also clears the Bad state: Tried to read a provider from a ProviderContainer that was already disposed that the test leaks after tearDown, which is the same root cause.
- limit: 100 truncates the bootstrap window (should fix)
subscription_manager.dart:737 adds limit: NostrEventExtensions.chatDefaultLimit (100). On main the orders filter carried no limit at all, so this is a new reduction in what the client receives, and it partially undoes the P1 fix.
_sessionsFloor() deliberately widens since back to the oldest live session on the first launch after upgrading (sessions default to 720 h, active ones are never cleaned up, and "forever" mode is unbounded) — but limit still caps the result at 100 events regardless of how far back since reaches.
Verified against wss://relay.mostro.network:
no limit: 300 events, oldest=1785639352 newest=1786423699
limit=100: 100 events, oldest=1788209797 newest=1788223631
The relay returns the newest 100 and silently drops the rest of the window. (That probe used kind 38383, far higher volume than the real filter, which is scoped by authors = node and p = trade keys — the point is the semantics, not the volume.)
The failure mode: if more than 100 node messages fall inside the window, the older ones are never delivered — and because they were never delivered they never enter _retryableEvents, so nothing holds the cursor back. It advances to the newest and those messages are lost permanently. This applies both to the 30+ day upgrade bootstrap and to a user who was offline for a long stretch with several concurrent trades (plus daemon retries).
The chat filter in main already uses this aggregate-limit pattern, so it is not a new pattern in the repo — but for orders it is a new restriction, and since already does the heavy lifting here. Raising it (500–1000) or dropping it on the no-cursor bootstrap branch costs almost nothing and removes the hole.
- Inverted doc comment (nit)
subscription_manager.dart:365:
▎ "Earliest start time across [sessions], capped at the default lookback so a long-lived session cannot widen the window beyond it and a short one cannot narrow it below it."
The first half states the opposite of what the code does — oldest.isBefore(defaultFloor) ? oldest : defaultFloor does widen past the lookback for an older session, which is exactly the P1 fix and what orders_since_bootstrap_test asserts. Only the second half holds.
- Prune only runs on the happy path (nit)
mostro_service.dart:165: the removeWhere that prunes _retryableEvents only runs inside _advanceOrdersCursor, after the if (event.kind != 14) return. If only held events arrive and none is ever processed, the map grows unpruned. Bounded in practice (the filter pins authors to the node, so nothing external can inject), but the prune belongs in _holdEventForRetry.
- PR description is stale
The body says the suite is green "except dispute_chat_duplicate_envelope_test.dart, which fails identically on pristine main". That is no longer true — this PR fixes it: 3/3 fail on main, 3/3 pass here. Worth updating the body, and the manual QA checkbox is still unchecked.
Drop the limit from the orders kind-14 filter. `since` already bounds the replay; a limit on top of it is answered with the newest n and silently drops the rest of the window. Those events are never delivered, so they never enter _retryableEvents and nothing holds the cursor back — it advances past them and they are lost for good. The window is widest exactly when it matters: the first launch after upgrading (the sessions floor deliberately reaches back to the oldest live session) and a user offline for a long stretch. main carried no limit here, so this also removes a regression in what the client receives. Replace the fixed 100 ms settle in the cursor regression test with polling on real anchors: processing runs an off-isolate NIP-44 decrypt, a Sembast write and a SharedPreferences write, none of which the test can await, so a fixed delay makes the test fail under load. A processed event settles once its durable marker is written (which _markEventProcessed writes before advancing the cursor); a held one settles once it actually holds the cursor back, via a new debugHeldEventIds test seam. Prune expired holds on the hold path too. The removeWhere ran only inside _advanceOrdersCursor, so a run in which every event is held grew the map unpruned. Fix the _sessionsFloor doc comment, whose first half stated the opposite of what the code does: an older session does widen the window past the default lookback, which is the point of it.
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Thanks — all five findings confirmed valid and fixed in 2afc638. Details in the PR body under Review follow-up; the short version: 1. Flaky test (blocking). Fixed with the I could not reproduce the flake here (8/8 idle, 6/6 under 8 spinning processes — this box likely has more headroom than yours or CI), but that doesn't refute it: gating an assertion on the end of an unawaited isolate-decrypt + Sembast + prefs chain with a fixed delay is racy by construction. I also mutation-tested the result — removing the contiguous-watermark guard still turns the orphan test RED — so the polling didn't quietly make the assertions vacuous. 2. 3. Inverted doc comment. Confirmed and rewritten — 4. Prune on the hold path. Moved into 5. Stale description. Updated. You're right that this PR fixes The manual QA item is still unchecked — I haven't run it, so I left the box as-is rather than ticking it. One note: the |
2 participants
Summary
Item 4.1 of the performance plan. The orders filter (kind 14, node-authored) carried no
sinceorlimit: every (re)subscription — cold start, foreground resume, relay recovery, node switch — replayed the node's full message history from every relay, each replayed event paying a Sembast dedup read on the UI isolate.kind 14 events carry real timestamps (unlike the retired gift wrap's ±48 h randomization), so the proven chat-cursor pattern applies directly.
Changes
orders_since_cursor namespace (keyed by node pubkey — one live orders REQ per node) on the existingChatCursorStore(monotonic, clock-clamped, serializedadvance).buildOrdersFilter(nip44 branch):since = cursor − overlapwith fallback to the default lookback (7 d) on fresh installs — older history is the restore flow's job — plus alimit. The legacy 1059 branch stays unbounded until its removal.MostroService._markEventProcessedadvances the cursor — the same place that marks an event processed, so events deliberately left unmarked (no matching session yet during startup ordering) stay within the cursor's 10-min overlap window for a later resubscription to retry.Test plan
orders_filter_test.dartextended (RED onmain): nip44 carriessinceand nolimit; giftWrap ignoressincedispute_chat_duplicate_envelope_test.dartis fixed by this PR (3/3 fail on pristinemain, 3/3 pass here); the earlier note calling it pre-existing and unfixed was staleflutter analyze— no new issues🤖 Generated with Claude Code
https://claude.ai/code/session_018fTxqxhpdL5siTgKZqwtur
Summary by CodeRabbit
New Features
Bug Fixes
Review follow-up (2afc638)
Addresses this review — all five findings confirmed valid.
Flaky regression test (blocking). The fixed
100 mssettle gated an assertion on the end of an unawaited chain (off-isolate NIP-44 decrypt + Sembast write + SharedPreferences write). Replaced with polling on real anchors rather than a longer sleep: a processed event settles once its durable marker is written (_markEventProcessedwrites it before advancing the cursor), and a held event settles once it actually holds the cursor back, via a new@visibleForTesting debugHeldEventIdsseam — so the orphan case is deterministic instead of timing-based. Mutation-tested: removing the contiguous-watermark guard still turns the orphan test RED, so the polling did not make the assertions vacuous. (I could not reproduce the flake locally — 8/8 idle and 6/6 under 8-way CPU load — but the race is real by construction, so the fix stands regardless.)limit: 100truncates the bootstrap window. Confirmedmaincarried no limit here, so this PR was a new restriction. Dropped the limit rather than raising it to 500–1000: raising only moves the hole further away, and the failure mode is permanent loss — truncated events are never delivered, so they never enter_retryableEventsand nothing holds the cursor back.sincealready bounds the replay, and the filter is scoped to one node's messages addressed to this user's trade keys, so volume stays small.orders_filter_test.dartupdated accordingly (filter.limitnow assertedisNull, with the reasoning).Inverted doc comment. Confirmed:
oldest.isBefore(defaultFloor) ? oldest : defaultFloortakes the earlier of the two, so an older session does widen the window past the lookback — which is the P1 fix, and whatorders_since_bootstrap_testasserts. Rewritten.Prune only on the happy path. Moved into
_holdEventForRetry(via a shared_pruneExpiredHolds), so a run in which every event is held no longer grows the map unpruned.Stale PR description. Updated above.
flutter analyzeclean (2 pre-existingdeprecated_member_useinfos inautomation_contract_test.dart, untouched by this PR). ThedebugHeldEventIdsseam also needed implementing onFakeMostroServiceinintegration_test/test_helpers.dart, whichimplements MostroService.The manual QA item is still unchecked — I have not run it.