fix(daemon): compacted session replay for long-session recovery#4694
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Hi @doudouOUC — thanks for the patch! The commit history on this PR looks off: it currently contains 11 commits from other already-merged PRs (NOTICES generation, telemetry, atomic write, hooks matcher, ACP sessions, structuredClone, statusline options, SSE, insight, background shells, simplify skill) on top of your actual daemon replay change. As a result the diff balloons to ~285 files and the PR shows as conflicting against It looks like the branch was based off (or merged with) Could you rebase |
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Replace unbounded raw-event replay with turn-boundary compaction. On each turn_complete, streaming chunks merge into single events, tool call sequences fold to final state, transient signals drop. loadSession returns O(turns) compacted events instead of O(streaming_tokens) raw events. Key decisions: - Synchronous snapshot() eliminates watermark vs async-read race - Slot-based compaction preserves event ordering across types - liveJournal carries raw events for current incomplete turn - resume only returns lastEventId (no replay payload) - All new fields optional for backward compatibility 🤖 Generated with [Qwen Code](https://github.com/QwenLM/qwen-code)
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@tanzhenxin Thanks for flagging! The branch was already rebased onto |
Address review suggestions: - Extract shared mergeTextSlot() for agent_message_chunk/thought_chunk - Add 4 EventBus+CompactionEngine integration tests covering snapshotReplay(), liveJournal, and close lifecycle 🤖 Generated with [Qwen Code](https://github.com/QwenLM/qwen-code)
Add compactedReplay/liveJournal/lastEventId to toEqual assertions in load/resume/attach bridge tests. 🤖 Generated with [Qwen Code](https://github.com/QwenLM/qwen-code)
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Verification Report — PR #4694Commit: Test Results
Pre-existing Issues (NOT introduced by this PR)TypeScript errors in SDK test failures: 6 test files fail to load due to Test File Breakdown
Execution Environment
VerdictThe PR's own scope passes cleanly: 242 acp-bridge tests (including 26 new CompactionEngine tests) pass, ESLint clean, no whitespace issues. The typecheck/build errors and SDK test-load failures are pre-existing on |
- Update load/resume test mocks to return lastEventId/compactedReplay/liveJournal - Verify replaySnapshot population and SSE cursor from server watermark - Wrap compactionEngine.ingest() in try/catch to maintain BX9_p contract 🤖 Generated with [Qwen Code](https://github.com/QwenLM/qwen-code)
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[Suggestion] packages/acp-bridge/src/bridge.ts:1789 — Stale comment. Line 1789 states DaemonSessionClient.resume() seeds lastEventId: 0 and builds the cross-action race rationale on that premise. This PR changed resume() to use serverLastEventId ?? 0, so the comment is now factually wrong. The cross-action rejection logic is still correct, but the stated mechanism no longer holds.
— qwen3.7-max via Qwen Code /review
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Maintainer Verification ReportTested on: macOS Darwin 25.4.0 1. TypeScript Compilation
Verdict: Zero new TypeScript errors introduced. 2. CompactionEngine Unit Tests (acp-bridge)All 26 tests passed:
3. EventBus Tests (acp-bridge)All existing EventBus tests pass with the new 4. Bridge Tests (acp-bridge)All 216 bridge tests pass, including the updated 5. DaemonSessionClient Tests (sdk-typescript)Not a PR regression. Verified identical failure on base branch 6. Code Review SummaryArchitecture: Clean turn-boundary compaction replacing unbounded JSONL. Key design:
Backward compatibility: All new fields ( Minor observations (non-blocking):
No issues found. Ready to merge.
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No issues found. LGTM! ✅ — qwen3.7-max via Qwen Code /review
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Code Review Overview (AI Generated)
PR: #4694 fix(daemon): compacted session replay for long-session recovery
Type: Bug Fix / New Feature (supersedes #4678)
Change size: +1084/-35 across 11 files, 6 commits
Multi-Round Review (Rounds 0-6): Clean — 0 findings
Round 0 (Design): Excellent replacement for #4678's unbounded JSONL approach. Turn-boundary compaction is a fundamentally better design: synchronous snapshot() eliminates the watermark-vs-async-read TOCTOU, slot-based compaction preserves event ordering across types, liveJournal carries raw events for the current incomplete turn, and resume returns only lastEventId (no replay payload) for bandwidth efficiency. 25-30x payload reduction for typical sessions.
Round 1 (Architecture):
TurnBoundaryCompactionEngine(310 lines): clean slot-based design withtext|thought|tool|misc|latestWinsdiscriminated union.mergeTextSlot()correctly extracted to eliminate duplication betweenagent_message_chunkandagent_thought_chunk.mergeToolCallEvent: latest-wins strategy with null/undefined skip — correct for progressive tool state updates.- EventBus integration: optional third constructor parameter maintains backward compatibility.
snapshotReplay()proxies to engine.close()cascades to engine. - Bridge wiring:
createSessionEventBus()factory ensures every new EventBus gets a compaction engine.replayFieldsFor()correctly returns all 3 fields forloadbut only watermark forresume. Spread into all 3 restore response paths (existing session, raced entry, normal completion). - SDK changes:
load()uses server watermark as SSE cursor (was hardcoded 0).replaySnapshotstored as readonly property.DaemonReplaySnapshotexported viaindex.ts.
Round 2 (Robustness):
publish()wrapscompactionEngine.ingest()in try/catch — preserves BX9_p never-throws contract.replayFieldsFor()returns graceful{ lastEventId: entry.events.lastEventId }fallback when no engine configured.- SDK handles backward compatibility:
serverLastEventId ?? 0,compactedReplay ?? [],liveJournal ?? []— new SDK + old daemon degrades gracefully. close()is idempotent (guarded bythis.closed),ingest()is no-op after close.snapshot()returns defensive copies via.slice().
Round 3 (Security): No new attack surface. Replay data stays in-process, no new file I/O, no new network endpoints.
Round 4 (Performance):
- Synchronous snapshot eliminates async file read overhead.
compactCurrentTurn()is O(slots) per turn boundary — acceptable.liveJournalbounded by single-turn size, cleared on each turn boundary.compactedTurnsgrows linearly with turns (O(turns)) — design goal achieved.
Round 5 (Feature): All features in PR description verified in implementation:
- Text merging (agent_message + agent_thought) with
_metapreservation from last chunk - Tool call folding to final state with progressive merge
- Transient event filtering (slow_client_warning, client_evicted, replay_complete, stream_error)
- Latest-wins deduplication (available_commands_update, current_mode_update)
- Multi-turn compaction with independent turn boundaries
- liveJournal for incomplete turns
- Seed from persisted snapshot (crash recovery)
Round 6 (Undirected):
- Cross-file consistency verified: bridgeTypes.ts and SDK types.ts both declare optional
compactedReplay,liveJournal,lastEventId. - Test coverage: 22 compaction engine unit tests + 4 EventBus integration tests + 19 DaemonSessionClient tests + bridge test assertions updated.
EVENT_SCHEMA_VERSIONconstant used throughout (no hardcodedv: 1).- Stale comment and test titles updated in final commit.
wenshao Review Audit
All findings from 6 review rounds addressed and verified:
- mergeTextSlot extraction → Fixed in 6ac1245
- Integration test coverage → 4 EventBus.snapshotReplay tests added in 6ac1245
- bridge.test.ts toEqual assertions → Fixed in 38e4e2d (216 bridge tests passing)
- seed() in interface → Not taken (intentional design: class-only method for crash recovery)
- Hardcoded v:1 → Fixed in 0fcdc86 (EVENT_SCHEMA_VERSION)
- SDK test mocks missing replay fields → Fixed in 327a5ce
- ingest() try/catch for BX9_p → Fixed in 327a5ce
- Stale comment + test title → Fixed in d417292
wenshao: APPROVED at HEAD (d417292).
LGTM!
This review was generated by QoderWork AI
Summary
turn_complete, streaming chunks merge into single events, tool call sequences fold to final state, transient signals are droppedloadSessionreturns O(turns) compacted events instead of O(streaming_tokens) raw eventsKey Design Decisions
snapshot(): eliminates the watermark-vs-async-read race condition identified in fix(daemon): restore replay history after SSE ring eviction #4678 reviewliveJournal: carries raw events for the current incomplete turn so mid-stream refreshes workresumeonly returnslastEventId: no replay payload, no bandwidth wasteSupersedes #4678
This PR addresses the same root problem (SSE ring eviction breaks full-session recovery) with a different approach. See #4678 review comments for the issues this design avoids:
Test Plan
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