| 1 | package session |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "encoding/json" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "os" |
| 10 | "strings" |
| 11 | "sync" |
| 12 | "time" |
| 13 | |
| 14 | "reasonix/internal/provider" |
| 15 | "reasonix/internal/sessioncontent" |
| 16 | "reasonix/internal/transcript" |
| 17 | ) |
| 18 | |
| 19 | // Session owns the live business state for one session identity: sequence |
| 20 | // allocation, the bounded accepted tail, compact operation identities, and the |
| 21 | // current projection. Durable history bodies and searchable operation details |
| 22 | // live behind Query; the physical handle owns bytes and the writer lease. |
| 23 | // |
| 24 | // A commit becomes observable here before it is durable. That is deliberate and |
| 25 | // mirrors DSH: accepting an event updates the projection and the UI, while the |
| 26 | // binding batches the write-behind and Flush marks a semantic checkpoint. |
| 27 | type Session struct { |
| 28 | transcript *transcript.Projection |
| 29 | mu sync.Mutex |
| 30 | id string |
| 31 | manifest Manifest |
| 32 | next uint64 |
| 33 | commits []Commit |
| 34 | operations map[string]operationRecord |
| 35 | projection Projection |
| 36 | binding *PersistenceBinding |
| 37 | sealed bool |
| 38 | sealedError error |
| 39 | readOnly bool |
| 40 | // externalHistory means durable UI messages live in HistoryQuery rather |
| 41 | // than this runtime projection. Messages then contains only the accepted, |
| 42 | // not-yet-durable tail; ModelMessages remains the exact provider workset. |
| 43 | externalHistory bool |
| 44 | catalogPreview string |
| 45 | recentMessages []provider.Message |
| 46 | durableRecent []provider.Message |
| 47 | messageIDs messageIdentities |
| 48 | storageGeneration string |
| 49 | recovery *recoveryStore |
| 50 | // coldHandle backs a read-only session, which has no binding because it |
| 51 | // never enqueues or drains anything. |
| 52 | coldHandle SessionHandle |
| 53 | } |
| 54 | |
| 55 | // PreparedBatch is a validated, self-contained commit payload. Every expensive |
| 56 | // or fallible step — payload copying, schema validation, turn identity |
| 57 | // derivation, and the operation hash — happens here, before the caller takes |
| 58 | // the activity commit gate. CommitPrepared then only assigns identity and |
| 59 | // extends the log. |
| 60 | type PreparedBatch struct { |
| 61 | sessionID string |
| 62 | writerGeneration uint64 |
| 63 | operationID string |
| 64 | turnID string |
| 65 | events []Event |
| 66 | storedEvents []Event |
| 67 | hash string |
| 68 | reservation *queueReservation |
| 69 | prior *operationRecord |
| 70 | } |
| 71 | |
| 72 | // OperationID reports the stable idempotency key of the prepared batch. |
| 73 | func (p PreparedBatch) OperationID() string { return p.operationID } |
| 74 | |
| 75 | // Empty reports whether the batch carries no committable event. |
| 76 | func (p PreparedBatch) Empty() bool { return len(p.events) == 0 } |
| 77 | |
| 78 | // Release returns queue capacity when a prepared batch loses its activity or |
| 79 | // CAS race before acceptance. It is safe after CommitPrepared consumes it. |
| 80 | func (p PreparedBatch) Release() { p.reservation.release() } |
| 81 | |
| 82 | // newSession builds the live in-memory session over an already-open binding. |
| 83 | // commits is the durable prefix replayed by the handle; the projection is |
| 84 | // rebuilt from it so no business state is inherited from the physical layer. |
| 85 | func newSession(id string, manifest Manifest, commits []Commit, projection Projection, binding *PersistenceBinding) *Session { |
| 86 | operations := make(map[string]operationRecord, len(commits)) |
| 87 | next := uint64(1) |
| 88 | for _, commit := range commits { |
| 89 | operations[commit.OperationID] = compactOperationRecord(commit) |
| 90 | next = commit.LastSequence() + 1 |
| 91 | } |
| 92 | ids := make([]string, 0, len(projection.Messages)) |
| 93 | for _, message := range projection.Messages { |
| 94 | ids = append(ids, message.ID) |
| 95 | } |
| 96 | return &Session{ |
| 97 | id: id, manifest: manifest, next: next, |
| 98 | operations: operations, projection: projection, binding: binding, |
| 99 | messageIDs: identitiesOf(ids), |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | // ID returns the immutable session identity. |
| 104 | func (s *Session) ID() string { |
| 105 | if s == nil { |
| 106 | return "" |
| 107 | } |
| 108 | s.mu.Lock() |
| 109 | defer s.mu.Unlock() |
| 110 | return s.id |
| 111 | } |
| 112 | |
| 113 | // Manifest returns the persistence manifest that describes this session. |
| 114 | func (s *Session) Manifest() Manifest { |
| 115 | if s == nil { |
| 116 | return Manifest{} |
| 117 | } |
| 118 | s.mu.Lock() |
| 119 | defer s.mu.Unlock() |
| 120 | manifest := s.manifest |
| 121 | if manifest.Source != nil { |
| 122 | source := *manifest.Source |
| 123 | manifest.Source = &source |
| 124 | } |
| 125 | return manifest |
| 126 | } |
| 127 | |
| 128 | // ExplicitPermissionPreset excludes a fork's inherited parent choice. Only a |
| 129 | // preset event written under this session's own identity is its user choice. |
| 130 | func (s *Session) ExplicitPermissionPreset() string { |
| 131 | if s == nil { |
| 132 | return "" |
| 133 | } |
| 134 | s.mu.Lock() |
| 135 | defer s.mu.Unlock() |
| 136 | sequence := s.projection.PermissionPresetSequence |
| 137 | if sequence == 0 || (s.manifest.Source != nil && sequence <= s.manifest.InheritedEvents) { |
| 138 | return "" |
| 139 | } |
| 140 | return s.projection.PermissionPreset |
| 141 | } |
| 142 | |
| 143 | // EventSequence reports the last accepted sequence. Accepted events may still |
| 144 | // be waiting in the binding's write-behind queue. |
| 145 | func (s *Session) EventSequence() uint64 { |
| 146 | if s == nil { |
| 147 | return 0 |
| 148 | } |
| 149 | s.mu.Lock() |
| 150 | defer s.mu.Unlock() |
| 151 | return s.next - 1 |
| 152 | } |
| 153 | |
| 154 | // PrepareBatch validates the logical batch and computes its idempotency digest |
| 155 | // without touching the commit lock. Callers must treat the result as immutable. |
| 156 | func (s *Session) PrepareBatch(operationID string, batch Batch) (PreparedBatch, error) { |
| 157 | return s.PrepareBatchContext(context.Background(), operationID, batch) |
| 158 | } |
| 159 | |
| 160 | // PrepareBatchContext publishes large immutable payloads before the batch can |
| 161 | // enter the accepted sequence. It performs all disk I/O outside the session |
| 162 | // commit lock; CommitPrepared only revalidates identity and generation. |
| 163 | func (s *Session) PrepareBatchContext(ctx context.Context, operationID string, batch Batch) (PreparedBatch, error) { |
| 164 | if s == nil { |
| 165 | return PreparedBatch{}, fmt.Errorf("session: nil session") |
| 166 | } |
| 167 | operationID = strings.TrimSpace(operationID) |
| 168 | if operationID == "" { |
| 169 | operationID = strings.TrimSpace(batch.OperationID) |
| 170 | } |
| 171 | if operationID == "" || len(batch.Events) == 0 { |
| 172 | return PreparedBatch{}, fmt.Errorf("session: operation id and events are required") |
| 173 | } |
| 174 | turnID := strings.TrimSpace(batch.TurnID) |
| 175 | if turnID == "" && batchContains(batch.Events, "turn/start") { |
| 176 | turnID = deterministicID("turn\x00" + s.id + "\x00" + operationID) |
| 177 | } |
| 178 | events := cloneEvents(batch.Events) |
| 179 | for i := range events { |
| 180 | event := &events[i] |
| 181 | event.Kind = strings.TrimSpace(event.Kind) |
| 182 | if event.Kind == "message/retract" { |
| 183 | if event.Optional { |
| 184 | return PreparedBatch{}, fmt.Errorf("message/retract must be required") |
| 185 | } |
| 186 | event.Required = true |
| 187 | } |
| 188 | if event.Kind == "" { |
| 189 | return PreparedBatch{}, fmt.Errorf("session: events[%d].kind is required", i) |
| 190 | } |
| 191 | if !event.Optional && !ProjectionKinds[event.Kind] { |
| 192 | return PreparedBatch{}, fmt.Errorf("%w: unknown required event %q", ErrUnsupportedVersion, event.Kind) |
| 193 | } |
| 194 | if err := checkReplacementIdentities(*event); err != nil { |
| 195 | return PreparedBatch{}, err |
| 196 | } |
| 197 | // The durable sequence is assigned at commit time so a rejected batch |
| 198 | // never consumes one. |
| 199 | event.Sequence = 0 |
| 200 | } |
| 201 | // The digest covers exactly what the caller supplied. Generated event ids |
| 202 | // are deliberately excluded so retrying the same logical batch is |
| 203 | // idempotent instead of reporting a spurious operation conflict. |
| 204 | hash, err := hashOperation(s.id, turnID, events) |
| 205 | if err != nil { |
| 206 | return PreparedBatch{}, err |
| 207 | } |
| 208 | prior, found, err := s.lookupOperation(operationID) |
| 209 | if err != nil { |
| 210 | return PreparedBatch{}, fmt.Errorf("session: lookup operation %q: %w", operationID, err) |
| 211 | } |
| 212 | if found && prior.hash != hash { |
| 213 | return PreparedBatch{}, fmt.Errorf("%w: %q", ErrOperationConflict, operationID) |
| 214 | } |
| 215 | for i := range events { |
| 216 | if events[i].ID == "" { |
| 217 | events[i].ID = randomID() |
| 218 | } |
| 219 | } |
| 220 | s.mu.Lock() |
| 221 | sessionID, writerGeneration, binding, manifestCodec := s.id, s.manifest.WriterGeneration, s.binding, s.manifest.Codec |
| 222 | s.mu.Unlock() |
| 223 | if binding == nil { |
| 224 | return PreparedBatch{}, ErrReadOnly |
| 225 | } |
| 226 | storedEvents := cloneEvents(events) |
| 227 | if manifestCodec == Codec { |
| 228 | content := s.contentStore() |
| 229 | for i := range storedEvents { |
| 230 | if len(storedEvents[i].Payload) <= v4InlinePayloadBytes { |
| 231 | continue |
| 232 | } |
| 233 | if content == nil { |
| 234 | return PreparedBatch{}, errors.New("session: content store unavailable for large event payload") |
| 235 | } |
| 236 | ref, err := content.Put(ctx, bytes.NewReader(storedEvents[i].Payload), sessioncontent.Metadata{MediaType: "application/json"}) |
| 237 | if err != nil { |
| 238 | return PreparedBatch{}, fmt.Errorf("prepare event %s content: %w", storedEvents[i].ID, err) |
| 239 | } |
| 240 | storedEvents[i].Payload = nil |
| 241 | storedEvents[i].PayloadRef = &ref |
| 242 | } |
| 243 | } |
| 244 | reservation, err := binding.reserve(ctx, commitHotBytes(Commit{Events: storedEvents})) |
| 245 | if err != nil { |
| 246 | return PreparedBatch{}, err |
| 247 | } |
| 248 | prepared := PreparedBatch{sessionID: sessionID, writerGeneration: writerGeneration, operationID: operationID, turnID: turnID, events: events, storedEvents: storedEvents, hash: hash, reservation: reservation} |
| 249 | if found { |
| 250 | copy := prior |
| 251 | prepared.prior = © |
| 252 | } |
| 253 | return prepared, nil |
| 254 | } |
| 255 | |
| 256 | func (s *Session) lookupOperation(operationID string) (operationRecord, bool, error) { |
| 257 | if s == nil { |
| 258 | return operationRecord{}, false, nil |
| 259 | } |
| 260 | s.mu.Lock() |
| 261 | if record, ok := s.operations[operationID]; ok { |
| 262 | s.mu.Unlock() |
| 263 | return record, true, nil |
| 264 | } |
| 265 | recovery := s.recovery |
| 266 | s.mu.Unlock() |
| 267 | return recovery.lookupOperation(operationID) |
| 268 | } |
| 269 | |
| 270 | func (s *Session) contentStore() *sessioncontent.Store { |
| 271 | if s == nil || s.binding == nil { |
| 272 | return nil |
| 273 | } |
| 274 | store, _ := s.binding.handle.(*Store) |
| 275 | if store == nil { |
| 276 | return nil |
| 277 | } |
| 278 | return store.content |
| 279 | } |
| 280 | |
| 281 | func (s *Session) ContentStore() *sessioncontent.Store { return s.contentStore() } |
| 282 | |
| 283 | func (s *Session) StorageGeneration() string { |
| 284 | if s == nil { |
| 285 | return "" |
| 286 | } |
| 287 | s.mu.Lock() |
| 288 | defer s.mu.Unlock() |
| 289 | return s.storageGeneration |
| 290 | } |
| 291 | |
| 292 | // CommitPrepared appends an already validated batch under one short memory |
| 293 | // lock. The persistence binding only receives an immutable batch into its |
| 294 | // write-behind queue, so this never performs file I/O and never blocks on a |
| 295 | // subscriber. |
| 296 | func (s *Session) CommitPrepared(prepared PreparedBatch) (Commit, error) { |
| 297 | return s.commitPrepared(prepared, nil) |
| 298 | } |
| 299 | |
| 300 | func (s *Session) commitPrepared(prepared PreparedBatch, expectedTitleSequence *uint64) (Commit, error) { |
| 301 | defer prepared.Release() |
| 302 | if s == nil { |
| 303 | return Commit{}, fmt.Errorf("session: nil session") |
| 304 | } |
| 305 | if prepared.Empty() { |
| 306 | return Commit{}, fmt.Errorf("session: operation id and events are required") |
| 307 | } |
| 308 | s.mu.Lock() |
| 309 | if expectedTitleSequence != nil && s.projection.TitleSequence != *expectedTitleSequence { |
| 310 | s.mu.Unlock() |
| 311 | return Commit{}, ErrSessionTitleChanged |
| 312 | } |
| 313 | if prepared.sessionID != s.id || prepared.writerGeneration != s.manifest.WriterGeneration { |
| 314 | s.mu.Unlock() |
| 315 | return Commit{}, ErrStaleGeneration |
| 316 | } |
| 317 | if s.readOnly { |
| 318 | s.mu.Unlock() |
| 319 | return Commit{}, ErrReadOnly |
| 320 | } |
| 321 | if s.sealed { |
| 322 | err := s.sealedError |
| 323 | s.mu.Unlock() |
| 324 | if err == nil { |
| 325 | err = osClosedError() |
| 326 | } |
| 327 | return Commit{}, err |
| 328 | } |
| 329 | if prior, ok := s.operations[prepared.operationID]; ok { |
| 330 | if prior.hash != prepared.hash { |
| 331 | s.mu.Unlock() |
| 332 | return Commit{}, fmt.Errorf("%w: %q", ErrOperationConflict, prepared.operationID) |
| 333 | } |
| 334 | commit := prior.commit |
| 335 | commit.Events = cloneEvents(prepared.events) |
| 336 | for i := range commit.Events { |
| 337 | commit.Events[i].Sequence = commit.FirstSequence + uint64(i) |
| 338 | } |
| 339 | s.mu.Unlock() |
| 340 | return commit, nil |
| 341 | } |
| 342 | if prepared.prior != nil { |
| 343 | commit := prepared.prior.commit |
| 344 | commit.Events = cloneEvents(prepared.events) |
| 345 | for i := range commit.Events { |
| 346 | commit.Events[i].Sequence = commit.FirstSequence + uint64(i) |
| 347 | } |
| 348 | s.mu.Unlock() |
| 349 | return commit, nil |
| 350 | } |
| 351 | commitSchema, commitCodec := SchemaVersion, Codec |
| 352 | if s.manifest.Codec != Codec { |
| 353 | commitSchema, commitCodec = 3, s.manifest.Codec |
| 354 | } |
| 355 | commit := Commit{ |
| 356 | SchemaVersion: commitSchema, Codec: commitCodec, RecordType: "commit", ID: randomID(), |
| 357 | OperationID: prepared.operationID, OperationHash: prepared.hash, FirstSequence: s.next, |
| 358 | EventCount: len(prepared.events), TurnID: prepared.turnID, |
| 359 | WriterGeneration: s.manifest.WriterGeneration, CreatedAt: time.Now().UTC(), |
| 360 | // PreparedBatch already owns a private clone. Transfer it into the |
| 361 | // immutable accepted commit instead of copying every payload again. |
| 362 | Events: prepared.events, |
| 363 | } |
| 364 | for i := range commit.Events { |
| 365 | commit.Events[i].Sequence = commit.FirstSequence + uint64(i) |
| 366 | } |
| 367 | storedCommit := commit |
| 368 | storedCommit.Events = prepared.storedEvents |
| 369 | for i := range storedCommit.Events { |
| 370 | storedCommit.Events[i].Sequence = storedCommit.FirstSequence + uint64(i) |
| 371 | } |
| 372 | identities := s.messageIDs.changeFor(commit) |
| 373 | if identities.duplicate != "" { |
| 374 | s.mu.Unlock() |
| 375 | return Commit{}, duplicateMessageError(identities.duplicate) |
| 376 | } |
| 377 | projection := cloneProjection(s.projection) |
| 378 | if err := applyProjectionCommit(&projection, commit); err != nil { |
| 379 | s.mu.Unlock() |
| 380 | return Commit{}, err |
| 381 | } |
| 382 | binding := s.binding |
| 383 | if binding == nil { |
| 384 | s.mu.Unlock() |
| 385 | return Commit{}, ErrReadOnly |
| 386 | } |
| 387 | // Session and the persistence queue form one in-memory acceptance boundary. |
| 388 | // accept performs no I/O or callbacks; after projection validation there are |
| 389 | // no remaining fallible state changes in the closure. |
| 390 | err := binding.accept(storedCommit, prepared.reservation, func() { |
| 391 | s.commits = append(s.commits, commit) |
| 392 | s.projection = projection |
| 393 | s.messageIDs.apply(identities) |
| 394 | _ = applyRecentCommit(&s.recentMessages, commit) |
| 395 | s.next = commit.LastSequence() + 1 |
| 396 | s.operations[prepared.operationID] = compactOperationRecord(commit) |
| 397 | s.acceptTranscriptCommit(commit) |
| 398 | }) |
| 399 | s.mu.Unlock() |
| 400 | if err != nil { |
| 401 | return Commit{}, err |
| 402 | } |
| 403 | return cloneCommit(commit), nil |
| 404 | } |
| 405 | |
| 406 | // AppendBatch is the convenience form used by callers that do not need to |
| 407 | // separate validation from the commit. |
| 408 | func (s *Session) AppendBatch(ctx context.Context, operationID string, events []Event) (Commit, error) { |
| 409 | return s.Append(ctx, Batch{OperationID: operationID, Events: events}) |
| 410 | } |
| 411 | |
| 412 | // Append validates and commits a logical batch in one step. |
| 413 | func (s *Session) Append(ctx context.Context, batch Batch) (Commit, error) { |
| 414 | if err := ctx.Err(); err != nil { |
| 415 | return Commit{}, err |
| 416 | } |
| 417 | prepared, err := s.PrepareBatchContext(ctx, batch.OperationID, batch) |
| 418 | if err != nil { |
| 419 | return Commit{}, err |
| 420 | } |
| 421 | return s.CommitPrepared(prepared) |
| 422 | } |
| 423 | |
| 424 | // Snapshot returns the full live view, including message and turn history. |
| 425 | func (s *Session) Snapshot() Snapshot { return s.snapshot(true, true) } |
| 426 | |
| 427 | // StateSnapshot omits history so progress notifications do not copy every |
| 428 | // message and completed turn on each activity update. |
| 429 | func (s *Session) StateSnapshot() Snapshot { return s.snapshot(false, false) } |
| 430 | |
| 431 | // ExecutionSnapshot exposes the current model workset and business state, |
| 432 | // retaining local refusal evidence until outbound request normalization. It |
| 433 | // never materializes durable UI history; UI history is obtained from Query. |
| 434 | func (s *Session) ExecutionSnapshot() Snapshot { |
| 435 | snapshot := s.snapshot(false, true) |
| 436 | restoreRejectedToolResults(&snapshot.Projection) |
| 437 | return snapshot |
| 438 | } |
| 439 | |
| 440 | func (s *Session) snapshot(includeHistory, includeModel bool) Snapshot { |
| 441 | if s == nil { |
| 442 | return Snapshot{PersistenceStatus: PersistenceFailed, PersistenceError: "nil session"} |
| 443 | } |
| 444 | s.mu.Lock() |
| 445 | projection := s.projection |
| 446 | sequence := s.next - 1 |
| 447 | externalHistory := s.externalHistory |
| 448 | accepted := cloneCommits(s.commits) |
| 449 | var history eventPageReader |
| 450 | if s.binding != nil { |
| 451 | history = s.binding.handle |
| 452 | } else if s.coldHandle != nil { |
| 453 | history = s.coldHandle |
| 454 | } |
| 455 | s.mu.Unlock() |
| 456 | if includeHistory && externalHistory { |
| 457 | // Snapshot is the explicit full-history compatibility boundary. Service |
| 458 | // progress and Goal paths use StateSnapshot; paged clients use Query. |
| 459 | // Reconstructing here preserves existing callers without keeping a second |
| 460 | // durable UI transcript resident in every runtime. |
| 461 | if messages, err := materializeSnapshotMessages(history, accepted, sequence); err == nil { |
| 462 | projection.Messages = messages |
| 463 | } |
| 464 | } |
| 465 | if !includeHistory { |
| 466 | projection.Messages = nil |
| 467 | } |
| 468 | if !includeModel { |
| 469 | projection.ModelMessages, projection.Turns = nil, nil |
| 470 | } |
| 471 | snapshot := Snapshot{EventSequence: sequence, Projection: cloneProjection(projection)} |
| 472 | if s.binding != nil { |
| 473 | durable, status, detail := s.binding.progress() |
| 474 | snapshot.DurableSequence, snapshot.PersistenceStatus, snapshot.PersistenceError = durable, status, detail |
| 475 | } else { |
| 476 | snapshot.PersistenceStatus = PersistenceReady |
| 477 | } |
| 478 | // Nested provider metadata is immutable internally but Go cannot freeze |
| 479 | // returned slices. Detach it outside the commit lock before exposing it. |
| 480 | snapshot.Projection.Messages = detachMessages(snapshot.Projection.Messages) |
| 481 | snapshot.Projection.ModelMessages = detachMessages(snapshot.Projection.ModelMessages) |
| 482 | return snapshot |
| 483 | } |
| 484 | |
| 485 | // CatalogMetadata returns the rebuildable list projection of this session. |
| 486 | func (s *Session) CatalogMetadata() catalogMetadata { |
| 487 | if s == nil { |
| 488 | return catalogMetadata{Version: catalogMetadataVersion, Codec: Codec} |
| 489 | } |
| 490 | s.mu.Lock() |
| 491 | defer s.mu.Unlock() |
| 492 | metadata := metadataFromProjection(s.manifest, s.next-1, s.projection) |
| 493 | return metadata |
| 494 | } |
| 495 | |
| 496 | // DeriveMessages returns the model history projection. |
| 497 | func (s *Session) DeriveMessages() []provider.Message { |
| 498 | if s == nil { |
| 499 | return nil |
| 500 | } |
| 501 | s.mu.Lock() |
| 502 | messages := detachMessages(s.projection.ModelMessages) |
| 503 | s.mu.Unlock() |
| 504 | return messages |
| 505 | } |
| 506 | |
| 507 | func (s *Session) cacheWeight() int64 { |
| 508 | if s == nil { |
| 509 | return 0 |
| 510 | } |
| 511 | s.mu.Lock() |
| 512 | defer s.mu.Unlock() |
| 513 | weight := int64(64 << 10) |
| 514 | for id, result := range s.projection.RejectedToolResults { |
| 515 | weight += int64(128 + len(id) + len(result.ToolCallID) + len(result.Name) + len(result.State)) |
| 516 | } |
| 517 | for _, message := range s.projection.ModelMessages { |
| 518 | weight += int64(len(message.ID) + len(message.Content) + len(message.RawContent) + len(message.ProviderContent) + len(message.ReasoningContent) + len(message.ReasoningSignature) + len(message.Original)) |
| 519 | for _, image := range message.Images { |
| 520 | weight += int64(len(image)) |
| 521 | } |
| 522 | for _, call := range message.ToolCalls { |
| 523 | weight += int64(len(call.ID) + len(call.Name) + len(call.Arguments) + len(call.Diff)) |
| 524 | } |
| 525 | for _, item := range message.ResponsesItems { |
| 526 | weight += int64(len(item)) |
| 527 | } |
| 528 | for _, block := range message.ThinkingBlocks { |
| 529 | encoded, _ := json.Marshal(block) |
| 530 | weight += int64(len(encoded)) |
| 531 | } |
| 532 | } |
| 533 | weight += int64(len(s.projection.PlanState) + len(s.projection.GoalState)) |
| 534 | return weight |
| 535 | } |
| 536 | |
| 537 | // RecentSnapshot returns the bounded chat baseline without consulting the |
| 538 | // history locator or search index. |
| 539 | func (s *Session) RecentSnapshot() RecentSnapshot { |
| 540 | if s == nil { |
| 541 | return RecentSnapshot{} |
| 542 | } |
| 543 | durable := uint64(0) |
| 544 | if s.binding != nil { |
| 545 | durable = s.binding.durableSequence() |
| 546 | } |
| 547 | s.mu.Lock() |
| 548 | messages := detachMessages(s.durableRecent) |
| 549 | sessionDir := "" |
| 550 | if s.binding != nil { |
| 551 | sessionDir = s.binding.dir |
| 552 | } |
| 553 | snapshot := RecentSnapshot{ |
| 554 | Version: recoveryFormatVersion, SessionID: s.id, StorageGeneration: s.storageGeneration, |
| 555 | DurableSequence: durable, |
| 556 | Title: s.projection.Title, ModelRef: s.projection.ModelRef, ModelIdentity: s.projection.ModelIdentity, |
| 557 | TotalTurns: visibleBoundaryCount(s.projection, false), |
| 558 | } |
| 559 | s.mu.Unlock() |
| 560 | if sessionDir != "" { |
| 561 | snapshot.Entries, _ = buildRecentEntries(context.Background(), sessionDir, messages, durable, snapshot.TotalTurns) |
| 562 | } |
| 563 | return snapshot |
| 564 | } |
| 565 | |
| 566 | func materializeSnapshotMessages(history eventPageReader, accepted []Commit, acceptedSequence uint64) ([]provider.Message, error) { |
| 567 | projection, _ := Project(nil) |
| 568 | var cursor uint64 |
| 569 | if history != nil { |
| 570 | for { |
| 571 | startCursor := cursor |
| 572 | page, err := history.Read(context.Background(), cursor, 1000) |
| 573 | if err != nil { |
| 574 | return nil, err |
| 575 | } |
| 576 | for _, commit := range page.Commits { |
| 577 | if commit.LastSequence() > acceptedSequence { |
| 578 | break |
| 579 | } |
| 580 | if err := applyProjectionCommit(&projection, commit); err != nil { |
| 581 | return nil, err |
| 582 | } |
| 583 | // Only UI messages are requested at this compatibility boundary. |
| 584 | // Clearing the provider projection after each commit prevents a |
| 585 | // second cumulative model-history allocation during reconstruction. |
| 586 | projection.ModelMessages = nil |
| 587 | cursor = commit.LastSequence() |
| 588 | } |
| 589 | if !page.Truncated || cursor >= acceptedSequence { |
| 590 | break |
| 591 | } |
| 592 | if cursor <= startCursor { |
| 593 | return nil, fmt.Errorf("%w: full snapshot cursor did not advance", ErrDamagedStore) |
| 594 | } |
| 595 | } |
| 596 | } |
| 597 | for _, commit := range accepted { |
| 598 | if commit.LastSequence() <= cursor || commit.FirstSequence > acceptedSequence { |
| 599 | continue |
| 600 | } |
| 601 | if err := applyProjectionCommit(&projection, commit); err != nil { |
| 602 | return nil, err |
| 603 | } |
| 604 | projection.ModelMessages = nil |
| 605 | cursor = commit.LastSequence() |
| 606 | } |
| 607 | return projection.Messages, nil |
| 608 | } |
| 609 | |
| 610 | // externalizeDurableHistory switches a Service-owned runtime to the bounded |
| 611 | // history model. It is intentionally not used by the low-level Store API, |
| 612 | // whose compatibility callers still request a complete projection. |
| 613 | func (s *Session) externalizeDurableHistory() { |
| 614 | if s == nil { |
| 615 | return |
| 616 | } |
| 617 | s.mu.Lock() |
| 618 | defer s.mu.Unlock() |
| 619 | if s.externalHistory { |
| 620 | return |
| 621 | } |
| 622 | for _, message := range s.projection.Messages { |
| 623 | if s.catalogPreview == "" { |
| 624 | s.catalogPreview = catalogMessagePreview(message) |
| 625 | } |
| 626 | } |
| 627 | s.projection.Messages = nil |
| 628 | s.externalHistory = true |
| 629 | } |
| 630 | |
| 631 | // AcceptedPage returns the live accepted prefix, including events that have not |
| 632 | // crossed a durability checkpoint yet. SessionHandle.Read on the physical layer |
| 633 | // continues to expose only durable records. |
| 634 | func (s *Session) AcceptedPage(ctx context.Context, offset uint64, limit int) (EventPage, error) { |
| 635 | if err := ctx.Err(); err != nil { |
| 636 | return EventPage{}, err |
| 637 | } |
| 638 | if limit == 0 { |
| 639 | limit = 100 |
| 640 | } |
| 641 | if limit < 1 || limit > 1000 { |
| 642 | return EventPage{}, fmt.Errorf("session: read limit must be 1..1000 commits") |
| 643 | } |
| 644 | s.mu.Lock() |
| 645 | tail := cloneCommits(s.commits) |
| 646 | var handle SessionHandle |
| 647 | if s.binding != nil { |
| 648 | handle = s.binding.handle |
| 649 | } else { |
| 650 | handle = s.coldHandle |
| 651 | } |
| 652 | s.mu.Unlock() |
| 653 | page := EventPage{Commits: []Commit{}} |
| 654 | if handle != nil { |
| 655 | var err error |
| 656 | page, err = handle.Read(ctx, offset, limit) |
| 657 | if err != nil { |
| 658 | return EventPage{}, err |
| 659 | } |
| 660 | if page.Truncated || len(page.Commits) == limit { |
| 661 | return page, nil |
| 662 | } |
| 663 | } |
| 664 | for _, commit := range tail { |
| 665 | if commit.LastSequence() <= offset { |
| 666 | continue |
| 667 | } |
| 668 | if len(page.Commits) > 0 && commit.LastSequence() <= page.Commits[len(page.Commits)-1].LastSequence() { |
| 669 | continue |
| 670 | } |
| 671 | if len(page.Commits) == limit { |
| 672 | page.Truncated = true |
| 673 | break |
| 674 | } |
| 675 | page.Commits = append(page.Commits, cloneCommit(commit)) |
| 676 | page.Next = commit.LastSequence() |
| 677 | } |
| 678 | return page, nil |
| 679 | } |
| 680 | |
| 681 | // Flush drains the write-behind queue and returns the durable sequence. |
| 682 | func (s *Session) Flush(ctx context.Context) (DurableReceipt, error) { |
| 683 | if s == nil || s.binding == nil { |
| 684 | return DurableReceipt{}, ErrReadOnly |
| 685 | } |
| 686 | return s.binding.Flush(ctx) |
| 687 | } |
| 688 | |
| 689 | // FlushThrough waits only for the captured accepted prefix. |
| 690 | func (s *Session) FlushThrough(ctx context.Context, through uint64) (DurableReceipt, error) { |
| 691 | if s == nil || s.binding == nil { |
| 692 | return DurableReceipt{}, ErrReadOnly |
| 693 | } |
| 694 | if through > s.EventSequence() { |
| 695 | return DurableReceipt{}, fmt.Errorf("session: watermark exceeds accepted sequence") |
| 696 | } |
| 697 | return s.binding.FlushThrough(ctx, through) |
| 698 | } |
| 699 | |
| 700 | // Read exposes the durable prefix through a paged read. Events accepted but not |
| 701 | // yet checkpointed are visible through AcceptedPage instead. |
| 702 | func (s *Session) Read(ctx context.Context, offset uint64, limit int) (EventPage, error) { |
| 703 | handle := s.Handle() |
| 704 | if handle == nil { |
| 705 | return EventPage{}, os.ErrClosed |
| 706 | } |
| 707 | return handle.Read(ctx, offset, limit) |
| 708 | } |
| 709 | |
| 710 | // Close releases persistence ownership for this session. It is idempotent and |
| 711 | // uncancellable in effect: every caller observes the same close result. |
| 712 | func (s *Session) Close(ctx context.Context) error { return s.close(ctx) } |
| 713 | |
| 714 | // Sync forces the physical log to stable storage without draining new work. |
| 715 | func (s *Session) Sync(ctx context.Context) (DurableReceipt, error) { |
| 716 | handle := s.Handle() |
| 717 | if handle == nil { |
| 718 | return DurableReceipt{}, ErrReadOnly |
| 719 | } |
| 720 | return handle.Sync(ctx) |
| 721 | } |
| 722 | |
| 723 | // newReadSession builds a cold session over a read-only handle. It replays |
| 724 | // nothing: cold callers consume the durable prefix through paged Read, which is |
| 725 | // what keeps catalog and history queries independent of log length. |
| 726 | func newReadSession(handle SessionHandle) *Session { |
| 727 | manifest := handle.Manifest() |
| 728 | return &Session{ |
| 729 | id: manifest.SessionID, manifest: manifest, next: 1, |
| 730 | operations: map[string]operationRecord{}, readOnly: true, |
| 731 | coldHandle: handle, |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | // Handle exposes the physical persistence handle. Callers must not treat it as |
| 736 | // a business-state owner: reads see only the durable prefix. |
| 737 | func (s *Session) Handle() SessionHandle { |
| 738 | if s == nil { |
| 739 | return nil |
| 740 | } |
| 741 | s.mu.Lock() |
| 742 | defer s.mu.Unlock() |
| 743 | if s.binding == nil { |
| 744 | return s.coldHandle |
| 745 | } |
| 746 | return s.binding.handle |
| 747 | } |
| 748 | |
| 749 | // WritableHandle exposes the leased physical handle for fork, export, and |
| 750 | // recovery operations that are defined in terms of durable bytes. |
| 751 | func (s *Session) WritableHandle() WritableSessionHandle { |
| 752 | if s == nil { |
| 753 | return nil |
| 754 | } |
| 755 | s.mu.Lock() |
| 756 | defer s.mu.Unlock() |
| 757 | if s.binding == nil { |
| 758 | return nil |
| 759 | } |
| 760 | handle, _ := s.binding.handle.(WritableSessionHandle) |
| 761 | return handle |
| 762 | } |
| 763 | |
| 764 | // seal stops accepting new commits. It is the admission boundary that Runtime |
| 765 | // close establishes before the binding is drained. |
| 766 | func (s *Session) seal(err error) { |
| 767 | if s == nil { |
| 768 | return |
| 769 | } |
| 770 | s.mu.Lock() |
| 771 | s.sealed = true |
| 772 | s.sealedError = err |
| 773 | binding := s.binding |
| 774 | s.mu.Unlock() |
| 775 | if binding != nil { |
| 776 | binding.stopAccepting() |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | // close seals the session, drains the binding, and closes the physical handle. |
| 781 | // It is uncancellable and idempotent: every caller observes the same result. |
| 782 | func (s *Session) close(ctx context.Context) error { |
| 783 | if s == nil { |
| 784 | return nil |
| 785 | } |
| 786 | s.seal(osClosedError()) |
| 787 | s.mu.Lock() |
| 788 | binding, cold := s.binding, s.coldHandle |
| 789 | s.mu.Unlock() |
| 790 | if binding != nil { |
| 791 | return binding.Close(ctx) |
| 792 | } |
| 793 | if cold != nil { |
| 794 | // A cold session holds no binding, so its handle is released directly. |
| 795 | // Leaving it open would leak the read handle for every catalog scan. |
| 796 | return cold.Close(ctx) |
| 797 | } |
| 798 | return nil |
| 799 | } |
| 800 |