| 1 | package sessioninbox |
| 2 | |
| 3 | import ( |
| 4 | "strings" |
| 5 | "time" |
| 6 | ) |
| 7 | |
| 8 | // DeleteItem removes metadata first, then the blob (crash may leave orphan). |
| 9 | func (s *Store) DeleteItem(id string) error { |
| 10 | return s.deleteItem(id, false) |
| 11 | } |
| 12 | |
| 13 | // DeletePendingOrAcceptedItem atomically withdraws a queued item or an |
| 14 | // accepted-but-unconsumed steer. A concurrent consumed transition wins by |
| 15 | // making the delete fail with ErrInvalidState. |
| 16 | func (s *Store) DeletePendingOrAcceptedItem(id string) error { |
| 17 | return s.deleteItem(id, true) |
| 18 | } |
| 19 | |
| 20 | func (s *Store) deleteItem(id string, allowAcceptedSteer bool) error { |
| 21 | if s == nil { |
| 22 | return ErrClosed |
| 23 | } |
| 24 | id = strings.TrimSpace(id) |
| 25 | s.mu.Lock() |
| 26 | defer s.mu.Unlock() |
| 27 | release, err := s.beginDiskTransactionLocked() |
| 28 | if err != nil { |
| 29 | return err |
| 30 | } |
| 31 | defer release() |
| 32 | if err := s.mutableLocked(); err != nil { |
| 33 | return err |
| 34 | } |
| 35 | meta, ok := s.man.item(id) |
| 36 | if !ok { |
| 37 | return ErrNotFound |
| 38 | } |
| 39 | if !isPendingState(meta.State) && !(allowAcceptedSteer && meta.State == StateSteerAccepted) { |
| 40 | return ErrInvalidState |
| 41 | } |
| 42 | next := s.man.clone() |
| 43 | keys := next.idempotencyKeysFor(id) |
| 44 | next.rememberReceipt(keys, id, Disposition("deleted"), time.Now().UTC()) |
| 45 | removed, _ := next.removeItem(id) |
| 46 | clearPauseIfEmpty(next) |
| 47 | if err := s.commitManifestLocked(next); err != nil { |
| 48 | return err |
| 49 | } |
| 50 | s.removeBlobLocked(blobNameFor(removed)) |
| 51 | s.notifyLocked(s.snapshotLocked()) |
| 52 | return nil |
| 53 | } |
| 54 | |
| 55 | // DiscardPendingItems removes the named, not-yet-admitted items in one |
| 56 | // manifest transaction. Missing IDs are treated as already consumed so a |
| 57 | // frontend may safely cancel from a slightly stale metadata snapshot. Items |
| 58 | // that have crossed the admission boundary are never deleted here. |
| 59 | func (s *Store) DiscardPendingItems(ids []string) error { |
| 60 | return s.DiscardPendingItemsOwned(ids, "") |
| 61 | } |
| 62 | |
| 63 | // DiscardPendingItemsOwned atomically removes pending IDs belonging to source. |
| 64 | // Foreign-source IDs are ignored so one frontend cannot cancel another. |
| 65 | func (s *Store) DiscardPendingItemsOwned(ids []string, source string) error { |
| 66 | _, err := s.discardPendingItemsOwnedResult(ids, source, true) |
| 67 | return err |
| 68 | } |
| 69 | |
| 70 | // DiscardPendingItemsOwnedResult atomically removes cancellable IDs belonging |
| 71 | // to source and returns exactly the IDs committed as discarded. Items that |
| 72 | // already crossed the durable delivery boundary are ignored instead of making |
| 73 | // a mixed batch fail as a whole. |
| 74 | func (s *Store) DiscardPendingItemsOwnedResult(ids []string, source string) ([]string, error) { |
| 75 | return s.discardPendingItemsOwnedResult(ids, source, false) |
| 76 | } |
| 77 | |
| 78 | func (s *Store) discardPendingItemsOwnedResult(ids []string, source string, strict bool) ([]string, error) { |
| 79 | if s == nil { |
| 80 | return nil, ErrClosed |
| 81 | } |
| 82 | wanted := make(map[string]struct{}, len(ids)) |
| 83 | for _, id := range ids { |
| 84 | if id = strings.TrimSpace(id); id != "" { |
| 85 | wanted[id] = struct{}{} |
| 86 | } |
| 87 | } |
| 88 | if len(wanted) == 0 { |
| 89 | return []string{}, nil |
| 90 | } |
| 91 | |
| 92 | s.mu.Lock() |
| 93 | defer s.mu.Unlock() |
| 94 | release, err := s.beginDiskTransactionLocked() |
| 95 | if err != nil { |
| 96 | return nil, err |
| 97 | } |
| 98 | defer release() |
| 99 | if err := s.mutableLocked(); err != nil { |
| 100 | return nil, err |
| 101 | } |
| 102 | for _, item := range s.man.Items { |
| 103 | if _, ok := wanted[item.ID]; !ok { |
| 104 | continue |
| 105 | } |
| 106 | if source != "" && item.Source != source { |
| 107 | continue |
| 108 | } |
| 109 | switch item.State { |
| 110 | case StateQueued, StateBlocked, StateUncertain: |
| 111 | case StateSteerAccepted: |
| 112 | if strict { |
| 113 | return nil, ErrInvalidState |
| 114 | } |
| 115 | case StateRunning, StateSteerConsumed: |
| 116 | if strict { |
| 117 | return nil, ErrInvalidState |
| 118 | } |
| 119 | default: |
| 120 | return nil, ErrInvalidState |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | next := s.man.clone() |
| 125 | removed := make([]InboxItemMeta, 0, len(wanted)) |
| 126 | kept := next.Items[:0] |
| 127 | for _, item := range next.Items { |
| 128 | _, selected := wanted[item.ID] |
| 129 | owned := source == "" || item.Source == source |
| 130 | cancellable := item.State == StateQueued || item.State == StateBlocked || item.State == StateUncertain || item.State == StateSteerAccepted |
| 131 | if selected && owned && cancellable { |
| 132 | removed = append(removed, item) |
| 133 | continue |
| 134 | } |
| 135 | kept = append(kept, item) |
| 136 | } |
| 137 | if len(removed) == 0 { |
| 138 | return []string{}, nil |
| 139 | } |
| 140 | next.Items = kept |
| 141 | now := time.Now().UTC() |
| 142 | for _, item := range removed { |
| 143 | keys := next.idempotencyKeysFor(item.ID) |
| 144 | next.rememberReceipt(keys, item.ID, Disposition("discarded"), now) |
| 145 | for _, key := range keys { |
| 146 | delete(next.Idempotency, key) |
| 147 | delete(next.IdempotencyHashes, key) |
| 148 | } |
| 149 | } |
| 150 | clearPauseIfEmpty(next) |
| 151 | if err := s.commitManifestLocked(next); err != nil { |
| 152 | return nil, err |
| 153 | } |
| 154 | for _, item := range removed { |
| 155 | s.removeBlobLocked(blobNameFor(item)) |
| 156 | } |
| 157 | s.notifyLocked(s.snapshotLocked()) |
| 158 | discarded := make([]string, 0, len(removed)) |
| 159 | for _, item := range removed { |
| 160 | discarded = append(discarded, item.ID) |
| 161 | } |
| 162 | return discarded, nil |
| 163 | } |
| 164 | |
| 165 | // MoveItem reorders the queue. toIndex is 0-based; values past the end append. |
| 166 | func (s *Store) MoveItem(id string, toIndex int) error { |
| 167 | if s == nil { |
| 168 | return ErrClosed |
| 169 | } |
| 170 | id = strings.TrimSpace(id) |
| 171 | s.mu.Lock() |
| 172 | defer s.mu.Unlock() |
| 173 | release, err := s.beginDiskTransactionLocked() |
| 174 | if err != nil { |
| 175 | return err |
| 176 | } |
| 177 | defer release() |
| 178 | if err := s.mutableLocked(); err != nil { |
| 179 | return err |
| 180 | } |
| 181 | next := s.man.clone() |
| 182 | from := next.indexOf(id) |
| 183 | if from < 0 { |
| 184 | return ErrNotFound |
| 185 | } |
| 186 | if !isPendingState(next.Items[from].State) { |
| 187 | return ErrInvalidState |
| 188 | } |
| 189 | if toIndex < 0 { |
| 190 | toIndex = 0 |
| 191 | } |
| 192 | if toIndex >= len(next.Items) { |
| 193 | toIndex = len(next.Items) - 1 |
| 194 | } |
| 195 | if from == toIndex { |
| 196 | return nil |
| 197 | } |
| 198 | it := next.Items[from] |
| 199 | next.Items = append(next.Items[:from], next.Items[from+1:]...) |
| 200 | if toIndex > len(next.Items) { |
| 201 | toIndex = len(next.Items) |
| 202 | } |
| 203 | next.Items = append(next.Items[:toIndex], append([]InboxItemMeta{it}, next.Items[toIndex:]...)...) |
| 204 | if err := s.commitManifestLocked(next); err != nil { |
| 205 | return err |
| 206 | } |
| 207 | s.notifyLocked(s.snapshotLocked()) |
| 208 | return nil |
| 209 | } |
| 210 | |
| 211 | // SetPaused toggles the recovery/inspection pause flag. |
| 212 | func (s *Store) SetPaused(paused bool) error { |
| 213 | if s == nil { |
| 214 | return ErrClosed |
| 215 | } |
| 216 | s.mu.Lock() |
| 217 | defer s.mu.Unlock() |
| 218 | release, err := s.beginDiskTransactionLocked() |
| 219 | if err != nil { |
| 220 | return err |
| 221 | } |
| 222 | defer release() |
| 223 | if err := s.mutableLocked(); err != nil { |
| 224 | return err |
| 225 | } |
| 226 | if s.man.Paused == paused { |
| 227 | return nil |
| 228 | } |
| 229 | next := s.man.clone() |
| 230 | next.Paused = paused |
| 231 | if !paused { |
| 232 | next.Recovered = false |
| 233 | next.RecoveredN = 0 |
| 234 | } |
| 235 | if err := s.commitManifestLocked(next); err != nil { |
| 236 | return err |
| 237 | } |
| 238 | s.notifyLocked(s.snapshotLocked()) |
| 239 | return nil |
| 240 | } |
| 241 | |
| 242 | // PauseIfPending pauses dispatch only when the inbox still contains work. |
| 243 | func (s *Store) PauseIfPending() error { |
| 244 | if s == nil { |
| 245 | return ErrClosed |
| 246 | } |
| 247 | s.mu.Lock() |
| 248 | defer s.mu.Unlock() |
| 249 | release, err := s.beginDiskTransactionLocked() |
| 250 | if err != nil { |
| 251 | return err |
| 252 | } |
| 253 | defer release() |
| 254 | if err := s.mutableLocked(); err != nil { |
| 255 | return err |
| 256 | } |
| 257 | if len(s.man.Items) == 0 || s.man.Paused { |
| 258 | return nil |
| 259 | } |
| 260 | next := s.man.clone() |
| 261 | next.Paused = true |
| 262 | if err := s.commitManifestLocked(next); err != nil { |
| 263 | return err |
| 264 | } |
| 265 | s.notifyLocked(s.snapshotLocked()) |
| 266 | return nil |
| 267 | } |
| 268 | |
| 269 | // SetState transitions one item's durable state. |
| 270 | func (s *Store) SetState(id string, state InboxState, blockReason string) error { |
| 271 | if s == nil { |
| 272 | return ErrClosed |
| 273 | } |
| 274 | id = strings.TrimSpace(id) |
| 275 | s.mu.Lock() |
| 276 | defer s.mu.Unlock() |
| 277 | release, err := s.beginDiskTransactionLocked() |
| 278 | if err != nil { |
| 279 | return err |
| 280 | } |
| 281 | defer release() |
| 282 | if err := s.mutableLocked(); err != nil { |
| 283 | return err |
| 284 | } |
| 285 | next := s.man.clone() |
| 286 | i := next.indexOf(id) |
| 287 | if i < 0 { |
| 288 | return ErrNotFound |
| 289 | } |
| 290 | next.Items[i].State = state |
| 291 | next.Items[i].BlockReason = blockReason |
| 292 | next.Items[i].UpdatedAt = time.Now().UTC() |
| 293 | if err := s.commitManifestLocked(next); err != nil { |
| 294 | return err |
| 295 | } |
| 296 | s.notifyLocked(s.snapshotLocked()) |
| 297 | return nil |
| 298 | } |
| 299 | |
| 300 | // MarkSteerConsumed is the durable steer delivery boundary. A loader must |
| 301 | // commit this transition before returning the instruction to the agent. If a |
| 302 | // concurrent cancellation removed the accepted item first, the loader fails |
| 303 | // closed and the instruction is not applied. |
| 304 | func (s *Store) MarkSteerConsumed(id string) error { |
| 305 | return s.transitionAcceptedSteer(id, StateSteerConsumed, "", true) |
| 306 | } |
| 307 | |
| 308 | // MarkAcceptedSteerUncertain preserves an accepted steer that left the agent |
| 309 | // queue without being applied. It refuses to overwrite a consumed item. |
| 310 | func (s *Store) MarkAcceptedSteerUncertain(id, reason string) error { |
| 311 | return s.transitionAcceptedSteer(id, StateUncertain, reason, false) |
| 312 | } |
| 313 | |
| 314 | func (s *Store) transitionAcceptedSteer(id string, target InboxState, blockReason string, consumedIdempotent bool) error { |
| 315 | if s == nil { |
| 316 | return ErrClosed |
| 317 | } |
| 318 | id = strings.TrimSpace(id) |
| 319 | s.mu.Lock() |
| 320 | defer s.mu.Unlock() |
| 321 | release, err := s.beginDiskTransactionLocked() |
| 322 | if err != nil { |
| 323 | return err |
| 324 | } |
| 325 | defer release() |
| 326 | if err := s.mutableLocked(); err != nil { |
| 327 | return err |
| 328 | } |
| 329 | next := s.man.clone() |
| 330 | i := next.indexOf(id) |
| 331 | if i < 0 { |
| 332 | return ErrNotFound |
| 333 | } |
| 334 | if consumedIdempotent && next.Items[i].State == StateSteerConsumed { |
| 335 | return nil |
| 336 | } |
| 337 | if next.Items[i].State != StateSteerAccepted { |
| 338 | return ErrInvalidState |
| 339 | } |
| 340 | next.Items[i].State = target |
| 341 | next.Items[i].BlockReason = blockReason |
| 342 | next.Items[i].UpdatedAt = time.Now().UTC() |
| 343 | if err := s.commitManifestLocked(next); err != nil { |
| 344 | return err |
| 345 | } |
| 346 | s.notifyLocked(s.snapshotLocked()) |
| 347 | return nil |
| 348 | } |
| 349 | |
| 350 | // ClaimItem atomically transitions one queued item to running. It is the |
| 351 | // durable admission boundary for both asynchronous and synchronous frontends. |
| 352 | func (s *Store) ClaimItem(id string) error { |
| 353 | if s == nil { |
| 354 | return ErrClosed |
| 355 | } |
| 356 | id = strings.TrimSpace(id) |
| 357 | s.mu.Lock() |
| 358 | defer s.mu.Unlock() |
| 359 | release, err := s.beginDiskTransactionLocked() |
| 360 | if err != nil { |
| 361 | return err |
| 362 | } |
| 363 | defer release() |
| 364 | if err := s.mutableLocked(); err != nil { |
| 365 | return err |
| 366 | } |
| 367 | if s.man.Paused { |
| 368 | return ErrPaused |
| 369 | } |
| 370 | next := s.man.clone() |
| 371 | i := next.indexOf(id) |
| 372 | if i < 0 { |
| 373 | return ErrNotFound |
| 374 | } |
| 375 | if next.Items[i].State != StateQueued { |
| 376 | return ErrInvalidState |
| 377 | } |
| 378 | next.Items[i].State = StateRunning |
| 379 | next.Items[i].BlockReason = "" |
| 380 | next.Items[i].UpdatedAt = time.Now().UTC() |
| 381 | if err := s.commitManifestLocked(next); err != nil { |
| 382 | return err |
| 383 | } |
| 384 | s.notifyLocked(s.snapshotLocked()) |
| 385 | return nil |
| 386 | } |
| 387 | |
| 388 | // ConvertIntent changes followup ↔ steer while keeping the item queued. |
| 389 | func (s *Store) ConvertIntent(id string, intent InboxIntent) error { |
| 390 | if s == nil { |
| 391 | return ErrClosed |
| 392 | } |
| 393 | if intent != IntentSteer { |
| 394 | intent = IntentFollowup |
| 395 | } |
| 396 | s.mu.Lock() |
| 397 | defer s.mu.Unlock() |
| 398 | release, err := s.beginDiskTransactionLocked() |
| 399 | if err != nil { |
| 400 | return err |
| 401 | } |
| 402 | defer release() |
| 403 | if err := s.mutableLocked(); err != nil { |
| 404 | return err |
| 405 | } |
| 406 | next := s.man.clone() |
| 407 | i := next.indexOf(id) |
| 408 | if i < 0 { |
| 409 | return ErrNotFound |
| 410 | } |
| 411 | if !isPendingState(next.Items[i].State) { |
| 412 | return ErrInvalidState |
| 413 | } |
| 414 | next.Items[i].Intent = intent |
| 415 | next.Items[i].UpdatedAt = time.Now().UTC() |
| 416 | if err := s.commitManifestLocked(next); err != nil { |
| 417 | return err |
| 418 | } |
| 419 | s.notifyLocked(s.snapshotLocked()) |
| 420 | return nil |
| 421 | } |
| 422 | |
| 423 | // AckDequeue removes a running/consumed item after durable transcript commit. |
| 424 | func (s *Store) AckDequeue(id string) error { |
| 425 | if s == nil { |
| 426 | return ErrClosed |
| 427 | } |
| 428 | id = strings.TrimSpace(id) |
| 429 | s.mu.Lock() |
| 430 | defer s.mu.Unlock() |
| 431 | release, err := s.beginDiskTransactionLocked() |
| 432 | if err != nil { |
| 433 | return err |
| 434 | } |
| 435 | defer release() |
| 436 | if err := s.mutableLocked(); err != nil { |
| 437 | return err |
| 438 | } |
| 439 | next := s.man.clone() |
| 440 | keys := next.idempotencyKeysFor(id) |
| 441 | next.rememberReceipt(keys, id, Disposition("acknowledged"), time.Now().UTC()) |
| 442 | removed, ok := next.removeItem(id) |
| 443 | if !ok { |
| 444 | return ErrNotFound |
| 445 | } |
| 446 | switch removed.State { |
| 447 | case StateRunning, StateSteerAccepted, StateSteerConsumed: |
| 448 | default: |
| 449 | return ErrInvalidState |
| 450 | } |
| 451 | clearPauseIfEmpty(next) |
| 452 | if err := s.commitManifestLocked(next); err != nil { |
| 453 | return err |
| 454 | } |
| 455 | s.removeBlobLocked(blobNameFor(removed)) |
| 456 | s.notifyLocked(s.snapshotLocked()) |
| 457 | return nil |
| 458 | } |
| 459 | |
| 460 | // RetryItem resets uncertain/blocked items to queued. |
| 461 | func (s *Store) RetryItem(id string) error { |
| 462 | if s == nil { |
| 463 | return ErrClosed |
| 464 | } |
| 465 | id = strings.TrimSpace(id) |
| 466 | s.mu.Lock() |
| 467 | defer s.mu.Unlock() |
| 468 | release, err := s.beginDiskTransactionLocked() |
| 469 | if err != nil { |
| 470 | return err |
| 471 | } |
| 472 | defer release() |
| 473 | if err := s.mutableLocked(); err != nil { |
| 474 | return err |
| 475 | } |
| 476 | next := s.man.clone() |
| 477 | i := next.indexOf(id) |
| 478 | if i < 0 { |
| 479 | return ErrNotFound |
| 480 | } |
| 481 | switch next.Items[i].State { |
| 482 | case StateUncertain, StateBlocked: |
| 483 | next.Items[i].State = StateQueued |
| 484 | next.Items[i].BlockReason = "" |
| 485 | next.Items[i].UpdatedAt = time.Now().UTC() |
| 486 | default: |
| 487 | return ErrInvalidState |
| 488 | } |
| 489 | if err := s.commitManifestLocked(next); err != nil { |
| 490 | return err |
| 491 | } |
| 492 | s.notifyLocked(s.snapshotLocked()) |
| 493 | return nil |
| 494 | } |
| 495 | |
| 496 | // NextQueued returns the first FIFO queued follow-up (or rejected steer kept as |
| 497 | // follow-up) when the inbox is not paused. |
| 498 | func (s *Store) NextQueued() (InboxItemMeta, bool) { |
| 499 | if s == nil { |
| 500 | return InboxItemMeta{}, false |
| 501 | } |
| 502 | s.mu.Lock() |
| 503 | defer s.mu.Unlock() |
| 504 | if release, err := s.beginDiskTransactionLocked(); err == nil { |
| 505 | release() |
| 506 | } |
| 507 | if s.man == nil || s.man.Paused || s.readonly { |
| 508 | return InboxItemMeta{}, false |
| 509 | } |
| 510 | for _, it := range s.man.Items { |
| 511 | if it.State == StateQueued && it.Intent == IntentFollowup { |
| 512 | return it, true |
| 513 | } |
| 514 | // Rejected steers that remain intent=steer but queued are still follow-ups |
| 515 | // for the dispatcher after ConvertIntent; only followup intent is admitted. |
| 516 | } |
| 517 | // Also admit steer-intent items that are still queued (user wants them as turns). |
| 518 | for _, it := range s.man.Items { |
| 519 | if it.State == StateQueued { |
| 520 | return it, true |
| 521 | } |
| 522 | } |
| 523 | return InboxItemMeta{}, false |
| 524 | } |
| 525 | |
| 526 | // Pause marks paused=true without requiring a mutation check beyond schema. |
| 527 | func (s *Store) ForcePause(reasonRecovered bool, n int) error { |
| 528 | if s == nil { |
| 529 | return ErrClosed |
| 530 | } |
| 531 | s.mu.Lock() |
| 532 | defer s.mu.Unlock() |
| 533 | release, err := s.beginDiskTransactionLocked() |
| 534 | if err != nil { |
| 535 | return err |
| 536 | } |
| 537 | defer release() |
| 538 | if s.closed || s.readonly { |
| 539 | if s.readonly { |
| 540 | return nil |
| 541 | } |
| 542 | return ErrClosed |
| 543 | } |
| 544 | next := s.man.clone() |
| 545 | next.Paused = true |
| 546 | if reasonRecovered { |
| 547 | next.Recovered = true |
| 548 | if n > 0 { |
| 549 | next.RecoveredN = n |
| 550 | } |
| 551 | } |
| 552 | if err := s.commitManifestLocked(next); err != nil { |
| 553 | return err |
| 554 | } |
| 555 | s.notifyLocked(s.snapshotLocked()) |
| 556 | return nil |
| 557 | } |
| 558 | |
| 559 | func clearPauseIfEmpty(m *manifest) { |
| 560 | if m == nil || len(m.Items) > 0 { |
| 561 | return |
| 562 | } |
| 563 | m.Paused = false |
| 564 | m.Recovered = false |
| 565 | m.RecoveredN = 0 |
| 566 | } |
| 567 | |
| 568 | func isPendingState(state InboxState) bool { |
| 569 | switch state { |
| 570 | case StateQueued, StateBlocked, StateUncertain: |
| 571 | return true |
| 572 | default: |
| 573 | return false |
| 574 | } |
| 575 | } |
| 576 |