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3 Commits
Author SHA1 Message Date
pingqiuandClaude Opus 4.6 368a956aee fix: correct catch-up entry counting and rebuild transfer gate 
Entry counting:
- Session.setRange now initializes recoveredTo = startLSN
- RecordCatchUpProgress delta counts only actual catch-up work
  (recoveredTo - startLSN), not the replica's pre-existing prefix

Rebuild transfer gate:
- BeginTailReplay requires TransferredTo >= SnapshotLSN
- Prevents tail replay on incomplete base transfer

3 new regression tests:
- BudgetEntries_NonZeroStart_CountsOnlyDelta (30 entries within 50 budget)
- BudgetEntries_NonZeroStart_ExceedsBudget (30 entries exceeds 20 budget)
- Rebuild_PartialTransfer_BlocksTailReplay

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-29 21:35:03 -07:00
pingqiuandClaude Opus 4.6 bb24b4b039 fix: encapsulate engine sender/session authority state 
All mutable state on Sender and Session is now unexported:
- Sender.state, .epoch, .endpoint, .session, .stopped → accessors
- Session.id, .phase, .kind, etc. → read-only accessors
- Session() replaced by SessionSnapshot() (returns disconnected copy)
- SessionID() and HasActiveSession() for common queries
- AttachSession returns (sessionID, error) not (*Session, error)
- SupersedeSession returns sessionID not *Session

Budget configuration via SessionOption:
- WithBudget(CatchUpBudget) passed to AttachSession
- No direct field mutation on session from external code

New test: Encapsulation_SnapshotIsReadOnly proves snapshot
mutation does not leak back to sender state.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-29 20:58:28 -07:00
pingqiuandClaude Opus 4.6 20d70f9fb6 feat: add V2 engine replication core (Phase 05 Slice 1) 
Creates sw-block/engine/replication/ — the real V2 engine ownership core,
promoted from sw-block/prototype/enginev2/ with all accepted invariants.

Files:
- types.go: Endpoint, ReplicaState, SessionKind, SessionPhase, FSM transitions
- sender.go: per-replica Sender with full execution + rebuild APIs
- session.go: Session with identity, phases, frozen target, truncation, budget
- registry.go: Registry with reconcile + assignment intent + epoch invalidation
- budget.go: CatchUpBudget (duration, entries, stall detection)
- rebuild.go: RebuildState FSM (snapshot+tail vs full base)
- outcome.go: HandshakeResult + ClassifyRecoveryOutcome

Tests (ownership_test.go, 13 tests):
- Changed-address invalidation (A10)
- Stale session ID rejected at all APIs (A3)
- Stale completion after supersede (A3)
- Epoch bump invalidates all sessions (A3)
- Stale assignment epoch rejected
- Rebuild exclusivity (catch-up APIs rejected)
- Rebuild full lifecycle
- Frozen target rejects chase (A5)
- Budget violation escalates (A5)
- E2E: 3 replicas, 3 outcomes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-03-29 20:51:01 -07:00