| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bufio" |
| 5 | "context" |
| 6 | "encoding/base64" |
| 7 | "encoding/json" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "io" |
| 11 | "log/slog" |
| 12 | "os" |
| 13 | "path/filepath" |
| 14 | "reasonix/internal/agent" |
| 15 | "reasonix/internal/control" |
| 16 | "reasonix/internal/historywork" |
| 17 | "reasonix/internal/provider" |
| 18 | "reasonix/internal/session" |
| 19 | "reasonix/internal/store" |
| 20 | "slices" |
| 21 | "sort" |
| 22 | "strings" |
| 23 | "unicode/utf8" |
| 24 | ) |
| 25 | |
| 26 | // This file implements the windowed history paging API (Phase B1 of the |
| 27 | // history-pipeline refactor). HistoryPageForTab copies and converts the whole |
| 28 | // transcript on every request; HistorySliceForTab pages toward older history |
| 29 | // using the per-session display index sidecar (internal/agent |
| 30 | // SessionDisplayIndex) so only the returned window is read from disk and |
| 31 | // converted. The legacy API stays untouched for one compatibility cycle. |
| 32 | // |
| 33 | // Entry ID scheme: s<sessionFileID>:r<rewriteEpoch>:m<messageIndex>:o<subOrder>. |
| 34 | // - sessionFileID is the transcript basename minus .jsonl — stable for the |
| 35 | // life of the session file. |
| 36 | // - rewriteEpoch is the persisted rewrite version (live) or the index |
| 37 | // revision (cold, 0 when unknown). Append-only saves keep it, so entry IDs |
| 38 | // of an unchanged prefix survive appends; rewrites (compaction, rewind) |
| 39 | // bump it, and cursors go stale on rewrites anyway. |
| 40 | // - messageIndex is the absolute provider-message index; subOrder is the |
| 41 | // row number within that message's conversion (one message maps to 0..n |
| 42 | // history rows: notices, planner turns, …). |
| 43 | // |
| 44 | // Cursor format: base64url(JSON{v, revision, revKnown, digest, before}). |
| 45 | // The cursor binds the page to the session's persisted revision + content |
| 46 | // digest; any save bumps the revision, so continuing with a pre-save cursor |
| 47 | // returns HistorySlice{Stale: true} and the frontend reloads the latest page. |
| 48 | // "before" is the absolute provider-message index the next page ends at |
| 49 | // (exclusive), which carries the intra-turn position for oversized turns: |
| 50 | // pages always cut at message boundaries, so concatenating pages reproduces |
| 51 | // the full conversion exactly — no duplication, no omission. |
| 52 | // |
| 53 | // Visible-turn mapping: the display index's AuthoredTurn is counted with |
| 54 | // IsUserAuthoredTurn semantics, which already excludes synthetic and steer |
| 55 | // user messages — exactly the desktop visible-turn rule — so an entry's |
| 56 | // visible turn is its AuthoredTurn (1-based; 0 = before the first turn). The |
| 57 | // unsaved in-memory tail of a live session is classified with the real |
| 58 | // resolver-based rule (isVisibleHistoryUser), matching today's behavior. |
| 59 | |
| 60 | const ( |
| 61 | defaultHistorySliceTurns = 12 |
| 62 | defaultHistorySliceEntries = 120 |
| 63 | defaultHistorySliceBytes = 512 << 10 |
| 64 | maxHistorySliceTurns = 500 |
| 65 | maxHistorySliceEntries = 1000 |
| 66 | maxHistorySliceBytes = 8 << 20 |
| 67 | |
| 68 | // historyInlineRefThreshold is the field size above which a string field |
| 69 | // is replaced inline by a preview + HistoryContentRef. |
| 70 | historyInlineRefThreshold = 64 << 10 |
| 71 | // historyFieldPreviewBytes is the rune-safe inline preview kept for a |
| 72 | // ref-replaced field. The full value stays retrievable via |
| 73 | // HistoryContentForTab. |
| 74 | historyFieldPreviewBytes = 4 << 10 |
| 75 | // historyContentChunkBytes is the HistoryContentForTab chunk size. Chunks |
| 76 | // split on UTF-8 rune boundaries, never mid-rune. |
| 77 | historyContentChunkBytes = 256 << 10 |
| 78 | |
| 79 | // historySliceColdWindowBytes caps the raw transcript span one cold-path |
| 80 | // page reads from disk. Inline output is still bounded by the byte budget; |
| 81 | // this cap only keeps windows dense with multi-megabyte image lines from |
| 82 | // reading unbounded file spans. |
| 83 | historySliceColdWindowBytes = 32 << 20 |
| 84 | // historyLookupChunkMessages bounds the number of decoded messages retained |
| 85 | // while deriving cross-page planner state. |
| 86 | historyLookupChunkMessages = 128 |
| 87 | ) |
| 88 | |
| 89 | // HistorySliceRequest is one page request. Cursor empty = latest page. |
| 90 | type HistorySliceRequest struct { |
| 91 | Cursor string `json:"cursor"` |
| 92 | Turns int `json:"turns"` // default 12 |
| 93 | Entries int `json:"entries"` // default 120 |
| 94 | Bytes int `json:"bytes"` // inline byte budget, default 512KiB |
| 95 | Newer bool `json:"newer,omitempty"` |
| 96 | // Bound native readers resolve anchors within their existing projection. |
| 97 | Anchor string `json:"anchor,omitempty"` |
| 98 | Turn int `json:"turn,omitempty"` |
| 99 | MessageID string `json:"messageId,omitempty"` |
| 100 | Generation string `json:"generation,omitempty"` |
| 101 | SnapshotSequence *uint64 `json:"snapshotSequence,omitempty"` |
| 102 | } |
| 103 | |
| 104 | // HistoryContentRef marks a string field that exceeded the inline threshold. |
| 105 | // The field carries a rune-safe preview prefix; the full value is retrievable |
| 106 | // in chunks via HistoryContentForTab. |
| 107 | type HistoryContentRef struct { |
| 108 | // Bound native windows keep content reads on the same cancellable owner. |
| 109 | ReadHandleID string `json:"readHandleId,omitempty"` |
| 110 | EntryID string `json:"entryId"` |
| 111 | Field string `json:"field"` // "content", "reasoning", "submitText", "detail", "code", "summary", "archive", "toolResultError", "toolArguments", "toolSubject", "toolSummary", "toolDiff" |
| 112 | Size int `json:"size"` |
| 113 | Chunks int `json:"chunks"` |
| 114 | // ToolCallID identifies the tool call for tool* fields. |
| 115 | ToolCallID string `json:"toolCallId,omitempty"` |
| 116 | // Revision/RevKnown/Digest bind the ref to the session state it was cut |
| 117 | // from; a mismatch on fetch resolves to Stale. |
| 118 | Revision int64 `json:"revision"` |
| 119 | RevKnown bool `json:"revKnown,omitempty"` |
| 120 | Digest string `json:"digest"` |
| 121 | } |
| 122 | |
| 123 | // HistoryEntry is one display row in a history page. |
| 124 | type HistoryEntry struct { |
| 125 | EntryID string `json:"entryId"` |
| 126 | // Turn is the absolute visible turn the row belongs to (1-based; 0 = |
| 127 | // before the first visible turn). |
| 128 | Turn int `json:"turn"` |
| 129 | // Order is the absolute provider-message index the row was converted |
| 130 | // from; combined with the sub-order in EntryID it is strictly increasing |
| 131 | // in display order. |
| 132 | Order int `json:"order"` |
| 133 | Message HistoryMessage `json:"message"` |
| 134 | // Refs lists the message fields replaced by previews. Always initialized |
| 135 | // so JSON encodes [] rather than null. |
| 136 | Refs []HistoryContentRef `json:"refs"` |
| 137 | } |
| 138 | |
| 139 | // HistorySlice is one page of history toward older messages. |
| 140 | type HistorySlice struct { |
| 141 | Entries []HistoryEntry `json:"entries"` |
| 142 | NextCursor string `json:"nextCursor"` // toward older; empty when none |
| 143 | HasOlder bool `json:"hasOlder"` |
| 144 | HasNewer bool `json:"hasNewer"` |
| 145 | NewerCursor string `json:"newerCursor,omitempty"` |
| 146 | TotalTurns int `json:"totalTurns"` |
| 147 | StartTurn int `json:"startTurn"` // oldest visible turn in the page (0 when none) |
| 148 | EndTurn int `json:"endTurn"` // newest visible turn in the page (0 when none) |
| 149 | Stale bool `json:"stale"` // cursor bound to an older session revision |
| 150 | Revision int64 `json:"revision"` // session revision the page was cut from (0 when unknown) |
| 151 | // RevisionKnown and Digest expose the complete canonical identity already |
| 152 | // carried by cursors. They let same-path resident frontend projections be |
| 153 | // invalidated after another process advances or rewrites the session. |
| 154 | RevisionKnown bool `json:"revisionKnown,omitempty"` |
| 155 | Digest string `json:"digest,omitempty"` |
| 156 | // Source: index|scan|live-index|live-fallback. Error marks a failed read |
| 157 | // (empty Entries alone means a genuinely empty session). |
| 158 | Source string `json:"source,omitempty"` |
| 159 | Error string `json:"error,omitempty"` |
| 160 | } |
| 161 | |
| 162 | // HistoryContentChunk is one chunk of a ref-replaced field's full value. |
| 163 | type HistoryContentChunk struct { |
| 164 | EntryID string `json:"entryId"` |
| 165 | Field string `json:"field"` |
| 166 | Chunk int `json:"chunk"` |
| 167 | Chunks int `json:"chunks"` |
| 168 | Data string `json:"data"` |
| 169 | Done bool `json:"done"` |
| 170 | Stale bool `json:"stale"` |
| 171 | } |
| 172 | |
| 173 | // MarshalJSON enforces the Wails contract even for zero values: entries is |
| 174 | // always [], never null. |
| 175 | func (s HistorySlice) MarshalJSON() ([]byte, error) { |
| 176 | type alias HistorySlice |
| 177 | if s.Entries == nil { |
| 178 | s.Entries = []HistoryEntry{} |
| 179 | } |
| 180 | return json.Marshal(alias(s)) |
| 181 | } |
| 182 | |
| 183 | // MarshalJSON keeps refs [] on zero values, matching the entries contract. |
| 184 | func (e HistoryEntry) MarshalJSON() ([]byte, error) { |
| 185 | type alias HistoryEntry |
| 186 | if e.Refs == nil { |
| 187 | e.Refs = []HistoryContentRef{} |
| 188 | } |
| 189 | return json.Marshal(alias(e)) |
| 190 | } |
| 191 | |
| 192 | func emptyHistorySlice() HistorySlice { return HistorySlice{Entries: []HistoryEntry{}} } |
| 193 | |
| 194 | func failedHistorySlice(message string) HistorySlice { |
| 195 | return HistorySlice{Entries: []HistoryEntry{}, Error: strings.TrimSpace(message)} |
| 196 | } |
| 197 | |
| 198 | func staleHistorySlice(revision int64, revisionKnown bool, digest string) HistorySlice { |
| 199 | return HistorySlice{ |
| 200 | Entries: []HistoryEntry{}, |
| 201 | Stale: true, |
| 202 | Revision: revision, |
| 203 | RevisionKnown: revisionKnown, |
| 204 | Digest: digest, |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | func normalizeHistorySliceRequest(req HistorySliceRequest) HistorySliceRequest { |
| 209 | if req.Turns <= 0 { |
| 210 | req.Turns = defaultHistorySliceTurns |
| 211 | } |
| 212 | if req.Turns > maxHistorySliceTurns { |
| 213 | req.Turns = maxHistorySliceTurns |
| 214 | } |
| 215 | if req.Entries <= 0 { |
| 216 | req.Entries = defaultHistorySliceEntries |
| 217 | } |
| 218 | if req.Entries > maxHistorySliceEntries { |
| 219 | req.Entries = maxHistorySliceEntries |
| 220 | } |
| 221 | if req.Bytes <= 0 { |
| 222 | req.Bytes = defaultHistorySliceBytes |
| 223 | } |
| 224 | if req.Bytes > maxHistorySliceBytes { |
| 225 | req.Bytes = maxHistorySliceBytes |
| 226 | } |
| 227 | return req |
| 228 | } |
| 229 | |
| 230 | // historySliceCursor is the opaque page position toward older history. |
| 231 | type historySliceCursor struct { |
| 232 | V int `json:"v"` |
| 233 | Revision int64 `json:"revision"` |
| 234 | RevKnown bool `json:"revKnown"` |
| 235 | Digest string `json:"digest"` |
| 236 | Before int `json:"before"` // next page covers messages/rows with index < Before |
| 237 | Source string `json:"source,omitempty"` |
| 238 | } |
| 239 | |
| 240 | func encodeHistorySliceCursor(c historySliceCursor) string { |
| 241 | b, err := json.Marshal(c) |
| 242 | if err != nil { |
| 243 | return "" |
| 244 | } |
| 245 | return base64.RawURLEncoding.EncodeToString(b) |
| 246 | } |
| 247 | |
| 248 | func decodeHistorySliceCursor(s string) (historySliceCursor, error) { |
| 249 | s = strings.TrimSpace(s) |
| 250 | if s == "" { |
| 251 | return historySliceCursor{}, nil |
| 252 | } |
| 253 | b, err := base64.RawURLEncoding.DecodeString(s) |
| 254 | if err != nil { |
| 255 | return historySliceCursor{}, err |
| 256 | } |
| 257 | var c historySliceCursor |
| 258 | if err := json.Unmarshal(b, &c); err != nil { |
| 259 | return historySliceCursor{}, err |
| 260 | } |
| 261 | if c.V != 1 || c.Before < 0 { |
| 262 | return historySliceCursor{}, fmt.Errorf("unsupported history cursor") |
| 263 | } |
| 264 | return c, nil |
| 265 | } |
| 266 | |
| 267 | // historySliceSource is the windowed read view over one session used to cut a |
| 268 | // page: per-message visible turns and roles plus bounded message fetches. |
| 269 | type historySliceSource struct { |
| 270 | sessionID string // transcript basename minus .jsonl |
| 271 | sourceID string // storage root and selected branch identity for cold cursors |
| 272 | total int // total provider messages |
| 273 | turns []int // turns[i] = visible turn of message i (1-based; 0 = before first turn) |
| 274 | roles []provider.Role |
| 275 | totalTurns int |
| 276 | revision int64 |
| 277 | revKnown bool |
| 278 | digest string |
| 279 | epoch int |
| 280 | // fetch returns messages [lo, hi). Implementations must copy or freshly |
| 281 | // decode; callers never mutate but may retain across budget checks. Decode |
| 282 | // errors are propagated all the way to the cold read instead of being |
| 283 | // mistaken for an empty window and indexing past its end. |
| 284 | fetch func(lo, hi int) ([]provider.Message, error) |
| 285 | // windowBytes estimates the raw transcript span of [lo, hi); 0 means |
| 286 | // unbounded-but-cheap (in-memory). Used to cap cold-path reads. |
| 287 | windowBytes func(lo, hi int) int64 |
| 288 | position func(int) (agent.DisplayIndexEntry, error) |
| 289 | usersBefore func(int) (int, error) |
| 290 | readErr error |
| 291 | maxFetch int |
| 292 | // Disk projections already preserve the available per-record timestamps. |
| 293 | // Missing optional display timestamps must never trigger whole-log replay. |
| 294 | windowOnly bool |
| 295 | } |
| 296 | |
| 297 | func (src *historySliceSource) turnAt(index int) int { |
| 298 | if src.position == nil { |
| 299 | return src.turns[index] |
| 300 | } |
| 301 | entry, err := src.position(index) |
| 302 | if err != nil { |
| 303 | src.readErr = err |
| 304 | } |
| 305 | return entry.AuthoredTurn |
| 306 | } |
| 307 | |
| 308 | func (src *historySliceSource) roleAt(index int) provider.Role { |
| 309 | if src.position == nil { |
| 310 | return src.roles[index] |
| 311 | } |
| 312 | entry, err := src.position(index) |
| 313 | if err != nil { |
| 314 | src.readErr = err |
| 315 | } |
| 316 | return historyPersistedUserRole(entry.Role, entry.PinnedContextRevision) |
| 317 | } |
| 318 | |
| 319 | func (src *historySliceSource) userCountBefore(index int) int { |
| 320 | if src.usersBefore == nil { |
| 321 | return countRoleBefore(src.roles, index, provider.RoleUser) |
| 322 | } |
| 323 | count, err := src.usersBefore(index) |
| 324 | if err != nil { |
| 325 | src.readErr = err |
| 326 | } |
| 327 | return count |
| 328 | } |
| 329 | |
| 330 | // identityMatches reports whether the cursor/ref identity describes the same |
| 331 | // session state as the source. Revision is normalized to 0 when unknown on |
| 332 | // both sides, so the comparison is exact. |
| 333 | func (src *historySliceSource) identityMatches(revision int64, revKnown bool, digest string) bool { |
| 334 | if !revKnown { |
| 335 | revision = 0 |
| 336 | } |
| 337 | return src.revKnown == revKnown && src.revision == revision && src.digest == digest |
| 338 | } |
| 339 | |
| 340 | // historyWindowController is the slice of *control.Controller the windowed |
| 341 | // live path needs. Kept as an interface assertion (like |
| 342 | // sessionTempFromController) so test fakes implementing control.SessionAPI |
| 343 | // keep working via the full-snapshot fallback. |
| 344 | type historyWindowController interface { |
| 345 | HistoryLen() int |
| 346 | HistoryWindow(start, end int) []provider.Message |
| 347 | SessionPersistedState() (agent.PersistedState, bool) |
| 348 | } |
| 349 | |
| 350 | // HistorySliceForTab returns one page of the tab's history toward older |
| 351 | // messages, converting only the returned window. |
| 352 | func (a *App) HistorySliceForTab(tabID string, req HistorySliceRequest) HistorySlice { |
| 353 | req = normalizeHistorySliceRequest(req) |
| 354 | a.mu.RLock() |
| 355 | tab := a.tabByIDLocked(tabID) |
| 356 | var ctrl control.SessionAPI |
| 357 | var sessionDir, sessionPath, sessionID string |
| 358 | if tab != nil { |
| 359 | ctrl = tab.Ctrl |
| 360 | sessionDir = tabSessionDir(tab) |
| 361 | sessionPath = tab.currentSessionPath() |
| 362 | sessionID = strings.TrimSpace(tab.SessionID) |
| 363 | } |
| 364 | a.mu.RUnlock() |
| 365 | |
| 366 | if ctrl == nil { |
| 367 | return a.historySliceBeforeController(tabID, sessionDir, sessionPath, sessionID, req) |
| 368 | } |
| 369 | if identity, ok := ctrl.(control.IdentityLifecycle); ok && identity.UsesExclusiveSession() { |
| 370 | ref, bound := identity.SessionRef() |
| 371 | service := identity.SessionService() |
| 372 | if !bound || service == nil || service.Query() == nil { |
| 373 | return failedHistorySlice("canonical session identity is unavailable") |
| 374 | } |
| 375 | slice, err := a.canonicalHistorySlice(service.Query(), ref, sessionDir, sessionPath, req) |
| 376 | if err != nil { |
| 377 | slog.Debug("desktop: canonical history slice failed", "session", ref.SessionID, "err", err) |
| 378 | return failedHistorySlice(err.Error()) |
| 379 | } |
| 380 | return slice |
| 381 | } |
| 382 | if p := ctrl.SessionPath(); strings.TrimSpace(p) != "" { |
| 383 | sessionPath = p |
| 384 | sessionDir = controllerSessionDir(ctrl) |
| 385 | } |
| 386 | return a.liveHistorySlice(ctrl, sessionDir, sessionPath, req) |
| 387 | } |
| 388 | |
| 389 | func (a *App) canonicalHistorySlice(query *session.Query, ref session.SessionRef, sessionDir, sessionPath string, req HistorySliceRequest) (HistorySlice, error) { |
| 390 | src, err := canonicalHistorySliceSource(query, ref) |
| 391 | if err != nil { |
| 392 | return emptyHistorySlice(), err |
| 393 | } |
| 394 | resolver := sessionDisplayResolver(sessionDir, sessionPath) |
| 395 | slice, err := a.pageHistorySliceSource(src, req, resolver, nil, nil, "") |
| 396 | if err != nil { |
| 397 | return emptyHistorySlice(), err |
| 398 | } |
| 399 | slice.Source = "canonical-index" |
| 400 | return slice, nil |
| 401 | } |
| 402 | |
| 403 | func canonicalHistorySliceSource(query *session.Query, ref session.SessionRef) (*historySliceSource, error) { |
| 404 | shape, err := query.HistoryShape(context.Background(), ref) |
| 405 | if err != nil { |
| 406 | return nil, err |
| 407 | } |
| 408 | turns := make([]int, len(shape.Positions)) |
| 409 | roles := make([]provider.Role, len(shape.Positions)) |
| 410 | for i, position := range shape.Positions { |
| 411 | if position.Position != int64(i+1) { |
| 412 | return nil, fmt.Errorf("canonical history position %d, want %d", position.Position, i+1) |
| 413 | } |
| 414 | turns[i] = position.VisibleTurn |
| 415 | roles[i] = position.Role |
| 416 | } |
| 417 | snapshot := shape.SnapshotSequence |
| 418 | src := &historySliceSource{ |
| 419 | sessionID: ref.SessionID, |
| 420 | total: len(shape.Positions), |
| 421 | turns: turns, |
| 422 | roles: roles, |
| 423 | totalTurns: shape.TotalTurns, |
| 424 | revision: int64(snapshot), |
| 425 | revKnown: true, |
| 426 | digest: canonicalHistoryDigest(ref.SessionID, snapshot), |
| 427 | epoch: session.StorageRevision, |
| 428 | fetch: func(lo, hi int) ([]provider.Message, error) { |
| 429 | return query.HistoryWindow(context.Background(), ref, snapshot, lo, hi) |
| 430 | }, |
| 431 | } |
| 432 | return src, nil |
| 433 | } |
| 434 | |
| 435 | func canonicalHistoryDigest(sessionID string, snapshot uint64) string { |
| 436 | return fmt.Sprintf("v4:%s:%d", sessionID, snapshot) |
| 437 | } |
| 438 | |
| 439 | // liveHistorySlice pages a tab with a running controller. The display index |
| 440 | // supplies turn boundaries when it validates against the session's persisted |
| 441 | // state; otherwise a single in-memory snapshot walk classifies turns (still |
| 442 | // converting only the window) and a background rebuild is kicked. |
| 443 | func (a *App) liveHistorySlice(ctrl control.SessionAPI, sessionDir, sessionPath string, req HistorySliceRequest) HistorySlice { |
| 444 | resolver := sessionDisplayResolver(sessionDir, sessionPath) |
| 445 | src, indexUsed := a.liveHistorySliceSource(ctrl, sessionPath, resolver) |
| 446 | if src == nil { |
| 447 | return emptyHistorySlice() |
| 448 | } |
| 449 | if !indexUsed { |
| 450 | a.kickHistoryIndexRebuild(sessionPath) |
| 451 | } |
| 452 | slice, err := a.pageHistorySliceSource(src, req, resolver, sessionPlannerDisplayTurns(sessionDir, sessionPath), ctrl.CheckpointTurnsByMessageIndex(), sessionPath) |
| 453 | if err != nil { |
| 454 | slog.Debug("desktop: live history slice failed", "path", sessionPath, "err", err) |
| 455 | return failedHistorySlice(err.Error()) |
| 456 | } |
| 457 | if indexUsed { |
| 458 | slice.Source = "live-index" |
| 459 | } else { |
| 460 | slice.Source = "live-fallback" |
| 461 | } |
| 462 | return slice |
| 463 | } |
| 464 | |
| 465 | func (a *App) liveHistorySliceSource(ctrl control.SessionAPI, sessionPath string, resolver func(string) string) (*historySliceSource, bool) { |
| 466 | sessionID := strings.TrimSuffix(filepath.Base(sessionPath), ".jsonl") |
| 467 | wc, ok := ctrl.(historyWindowController) |
| 468 | if !ok { |
| 469 | // Compat for fakes: full snapshot, windowed conversion. |
| 470 | msgs := ctrl.History() |
| 471 | src := newInMemoryHistorySliceSource(sessionID, msgs, resolver, agent.PersistedState{}, false) |
| 472 | return src, false |
| 473 | } |
| 474 | n := wc.HistoryLen() |
| 475 | ps, psOK := wc.SessionPersistedState() |
| 476 | if psOK && ps.AppendOnlyTail && n > 0 { |
| 477 | if idx, err := agent.LoadSessionDisplayIndex(store.SessionDisplayIndex(sessionPath)); err == nil && |
| 478 | idx.RevisionKnown == ps.RevisionKnown && |
| 479 | (!ps.RevisionKnown || idx.Revision == ps.Revision) && |
| 480 | idx.ContentDigest == ps.DigestHex && |
| 481 | idx.MessageCount <= n { |
| 482 | turns := make([]int, n) |
| 483 | roles := make([]provider.Role, n) |
| 484 | for i, e := range idx.Entries { |
| 485 | turns[i] = e.AuthoredTurn |
| 486 | roles[i] = historyPersistedUserRole(e.Role, e.PinnedContextRevision) |
| 487 | } |
| 488 | turn := idx.AuthoredTurns |
| 489 | if idx.MessageCount < n { |
| 490 | tail := wc.HistoryWindow(idx.MessageCount, n) |
| 491 | for j, m := range tail { |
| 492 | if isVisibleHistoryUser(m, resolver) { |
| 493 | turn++ |
| 494 | } |
| 495 | turns[idx.MessageCount+j] = turn |
| 496 | roles[idx.MessageCount+j] = historyPersistedUserRole(m.Role, agent.IsPinnedContextRevision(m)) |
| 497 | } |
| 498 | } |
| 499 | src := &historySliceSource{ |
| 500 | sessionID: sessionID, |
| 501 | total: n, |
| 502 | turns: turns, |
| 503 | roles: roles, |
| 504 | totalTurns: turn, |
| 505 | revision: ps.Revision, |
| 506 | revKnown: ps.RevisionKnown, |
| 507 | digest: ps.DigestHex, |
| 508 | epoch: ps.RewriteEpoch, |
| 509 | fetch: func(lo, hi int) ([]provider.Message, error) { |
| 510 | return wc.HistoryWindow(lo, hi), nil |
| 511 | }, |
| 512 | } |
| 513 | return src, true |
| 514 | } |
| 515 | } |
| 516 | // Fallback: one full snapshot for classification; conversion stays |
| 517 | // windowed. The background rebuild republishes the index when the |
| 518 | // in-memory log is exactly the persisted transcript. |
| 519 | msgs := ctrl.History() |
| 520 | var state agent.PersistedState |
| 521 | if psOK { |
| 522 | state = ps |
| 523 | } |
| 524 | src := newInMemoryHistorySliceSource(sessionID, msgs, resolver, state, psOK) |
| 525 | return src, false |
| 526 | } |
| 527 | |
| 528 | // newInMemoryHistorySliceSource builds a source by classifying a full |
| 529 | // in-memory snapshot with the resolver-based visible-turn rule — the same |
| 530 | // semantics the legacy history path uses. |
| 531 | func newInMemoryHistorySliceSource(sessionID string, msgs []provider.Message, resolver func(string) string, ps agent.PersistedState, psOK bool) *historySliceSource { |
| 532 | turns := make([]int, len(msgs)) |
| 533 | roles := make([]provider.Role, len(msgs)) |
| 534 | turn := 0 |
| 535 | for i, m := range msgs { |
| 536 | if isVisibleHistoryUser(m, resolver) { |
| 537 | turn++ |
| 538 | } |
| 539 | turns[i] = turn |
| 540 | roles[i] = historyPersistedUserRole(m.Role, agent.IsPinnedContextRevision(m)) |
| 541 | } |
| 542 | src := &historySliceSource{ |
| 543 | sessionID: sessionID, |
| 544 | total: len(msgs), |
| 545 | turns: turns, |
| 546 | roles: roles, |
| 547 | totalTurns: turn, |
| 548 | fetch: func(lo, hi int) ([]provider.Message, error) { |
| 549 | if lo < 0 { |
| 550 | lo = 0 |
| 551 | } |
| 552 | if hi > len(msgs) { |
| 553 | hi = len(msgs) |
| 554 | } |
| 555 | if lo >= hi { |
| 556 | return []provider.Message{}, nil |
| 557 | } |
| 558 | return msgs[lo:hi], nil |
| 559 | }, |
| 560 | } |
| 561 | if psOK { |
| 562 | src.revision = ps.Revision |
| 563 | src.revKnown = ps.RevisionKnown |
| 564 | src.digest = ps.DigestHex |
| 565 | src.epoch = ps.RewriteEpoch |
| 566 | } |
| 567 | return src |
| 568 | } |
| 569 | |
| 570 | // historyIndexTimestampValid is the cheap file-generation guard for |
| 571 | // cold offset reads. Save/scan publish the index atomically after the transcript |
| 572 | // is complete. Equal timestamps are ambiguous on coarse filesystems, so cold |
| 573 | // readers verify the streamed digest before trusting offsets. The migration |
| 574 | // probe may accept equality because it never reads indexed content. |
| 575 | func historyIndexTimestampValid(indexPath, sessionPath string, transcriptInfo os.FileInfo, idx *agent.SessionDisplayIndex, verifyEqual bool) bool { |
| 576 | indexInfo, err := os.Stat(indexPath) |
| 577 | if err != nil || indexInfo.IsDir() || idx == nil { |
| 578 | return false |
| 579 | } |
| 580 | if indexInfo.ModTime().After(transcriptInfo.ModTime()) { |
| 581 | return true |
| 582 | } |
| 583 | if !indexInfo.ModTime().Equal(transcriptInfo.ModTime()) { |
| 584 | return false |
| 585 | } |
| 586 | if !verifyEqual { |
| 587 | return true |
| 588 | } |
| 589 | scanned, err := agent.ScanSessionDisplayIndex(sessionPath) |
| 590 | matches := err == nil && scanned.TranscriptSize == idx.TranscriptSize && scanned.MessageCount == idx.MessageCount && scanned.ContentDigest == idx.ContentDigest |
| 591 | if matches { |
| 592 | if err := agent.WriteSessionDisplayIndex(indexPath, idx); err != nil { |
| 593 | slog.Debug("desktop: history display index tie republish failed", "path", sessionPath, "err", err) |
| 594 | } |
| 595 | } |
| 596 | return matches |
| 597 | } |
| 598 | |
| 599 | func coldHistorySliceSource(sessionPath string, idx *agent.SessionDisplayIndex) *historySliceSource { |
| 600 | n := idx.MessageCount |
| 601 | turns := make([]int, n) |
| 602 | roles := make([]provider.Role, n) |
| 603 | for i, e := range idx.Entries { |
| 604 | turns[i] = e.AuthoredTurn |
| 605 | roles[i] = historyPersistedUserRole(e.Role, e.PinnedContextRevision) |
| 606 | } |
| 607 | revision := idx.Revision |
| 608 | if !idx.RevisionKnown { |
| 609 | revision = 0 |
| 610 | } |
| 611 | epoch := 0 |
| 612 | if idx.RevisionKnown { |
| 613 | epoch = int(idx.Revision) |
| 614 | } |
| 615 | src := &historySliceSource{ |
| 616 | sessionID: strings.TrimSuffix(filepath.Base(sessionPath), ".jsonl"), |
| 617 | total: n, |
| 618 | turns: turns, |
| 619 | roles: roles, |
| 620 | totalTurns: idx.AuthoredTurns, |
| 621 | revision: revision, |
| 622 | revKnown: idx.RevisionKnown, |
| 623 | digest: idx.ContentDigest, |
| 624 | epoch: epoch, |
| 625 | fetch: func(lo, hi int) ([]provider.Message, error) { |
| 626 | if lo < 0 || hi < lo || hi > len(idx.Entries) { |
| 627 | return nil, fmt.Errorf("history display index window [%d,%d) is out of range", lo, hi) |
| 628 | } |
| 629 | return readSessionMessagesAtOffsets(sessionPath, idx.Entries[lo:hi]) |
| 630 | }, |
| 631 | windowBytes: func(lo, hi int) int64 { |
| 632 | if lo >= hi || hi > len(idx.Entries) { |
| 633 | return 0 |
| 634 | } |
| 635 | last := idx.Entries[hi-1] |
| 636 | return last.Offset + last.Length - idx.Entries[lo].Offset |
| 637 | }, |
| 638 | } |
| 639 | return src |
| 640 | } |
| 641 | |
| 642 | // readSessionMessagesAtOffsets decodes the message lines for entries, whose |
| 643 | // byte ranges are contiguous in the transcript, with one read. |
| 644 | func readSessionMessagesAtOffsets(sessionPath string, entries []agent.DisplayIndexEntry) ([]provider.Message, error) { |
| 645 | return readSessionMessagesAtOffsetsContext(context.Background(), sessionPath, entries) |
| 646 | } |
| 647 | |
| 648 | func readSessionMessagesAtOffsetsContext(ctx context.Context, sessionPath string, entries []agent.DisplayIndexEntry) ([]provider.Message, error) { |
| 649 | out := make([]provider.Message, 0, len(entries)) |
| 650 | if len(entries) == 0 { |
| 651 | return out, nil |
| 652 | } |
| 653 | f, err := os.Open(sessionPath) |
| 654 | if err != nil { |
| 655 | return nil, err |
| 656 | } |
| 657 | defer f.Close() |
| 658 | spanStart := entries[0].Offset |
| 659 | spanEnd := entries[len(entries)-1].Offset + entries[len(entries)-1].Length |
| 660 | spanLength := spanEnd - spanStart |
| 661 | if spanLength < 0 { |
| 662 | return nil, fmt.Errorf("invalid history display index span") |
| 663 | } |
| 664 | if spanLength <= historySliceColdWindowBytes { |
| 665 | buf := make([]byte, int(spanLength)) |
| 666 | if _, err := io.ReadFull(&historywork.Reader{Context: ctx, Source: io.NewSectionReader(f, spanStart, spanLength)}, buf); err != nil { |
| 667 | return nil, err |
| 668 | } |
| 669 | for _, e := range entries { |
| 670 | if err := ctx.Err(); err != nil { |
| 671 | return nil, err |
| 672 | } |
| 673 | start := e.Offset - spanStart |
| 674 | end := start + e.Length |
| 675 | if start < 0 || end < start || end > int64(len(buf)) { |
| 676 | return nil, fmt.Errorf("history display index line %d escapes fetched span", e.Index) |
| 677 | } |
| 678 | var m provider.Message |
| 679 | if err := json.Unmarshal(buf[int(start):int(end)], &m); err != nil { |
| 680 | return nil, fmt.Errorf("decode session transcript line %d: %w", e.Index, err) |
| 681 | } |
| 682 | out = append(out, m) |
| 683 | } |
| 684 | return out, nil |
| 685 | } |
| 686 | // A legitimate historical record may exceed the normal 32MiB page span. |
| 687 | // Decode it directly from a bounded section so the read path does not first |
| 688 | // allocate and copy a second full record-sized byte slice. |
| 689 | for _, e := range entries { |
| 690 | var m provider.Message |
| 691 | dec := json.NewDecoder(&historywork.Reader{Context: ctx, Source: io.NewSectionReader(f, e.Offset, e.Length)}) |
| 692 | if err := dec.Decode(&m); err != nil { |
| 693 | return nil, fmt.Errorf("decode oversized session transcript line %d: %w", e.Index, err) |
| 694 | } |
| 695 | out = append(out, m) |
| 696 | } |
| 697 | return out, nil |
| 698 | } |
| 699 | |
| 700 | // historySessionLooksEventFormat reports whether the transcript is a legacy |
| 701 | // event-record log rather than a provider-message transcript: event records |
| 702 | // carry kind/type and no role. |
| 703 | func historySessionLooksEventFormat(path string) bool { |
| 704 | f, err := os.Open(path) |
| 705 | if err != nil { |
| 706 | return false |
| 707 | } |
| 708 | defer f.Close() |
| 709 | line, err := bufio.NewReaderSize(f, 1<<20).ReadSlice('\n') |
| 710 | if errors.Is(err, bufio.ErrBufferFull) { |
| 711 | // Legacy event headers are tiny. A megabyte first record is a provider |
| 712 | // message or malformed input, neither of which needs event probing. |
| 713 | return false |
| 714 | } |
| 715 | if len(line) == 0 || err != nil && len(line) == 0 { |
| 716 | return false |
| 717 | } |
| 718 | var probe struct { |
| 719 | Role provider.Role `json:"role"` |
| 720 | Kind string `json:"kind"` |
| 721 | Type string `json:"type"` |
| 722 | } |
| 723 | if err := json.Unmarshal(line, &probe); err != nil { |
| 724 | return false |
| 725 | } |
| 726 | return probe.Role == "" && (probe.Kind != "" || probe.Type != "") |
| 727 | } |
| 728 | |
| 729 | // pageHistorySliceSource cuts one page from src. Pages are suffixes of the |
| 730 | // candidate window: the turn budget picks the oldest message that may be |
| 731 | // included, conversion runs forward (its cross-message state flows forward), |
| 732 | // and the entry/byte budgets drop the oldest whole-message groups — so cuts |
| 733 | // always land on message boundaries. |
| 734 | func (a *App) pageHistorySliceSource(src *historySliceSource, req HistorySliceRequest, resolver func(string) string, plannerTurns []plannerDisplayTurn, checkpointTurns map[int]int, sessionPath string) (HistorySlice, error) { |
| 735 | cursor, err := decodeHistorySliceCursor(req.Cursor) |
| 736 | // An undecodable cursor is treated like a request for the latest page. |
| 737 | hasCursor := req.Cursor != "" && err == nil |
| 738 | sourceID := src.sourceID |
| 739 | if sourceID == "" { |
| 740 | sourceID = src.sessionID |
| 741 | } |
| 742 | if src.windowOnly && req.Cursor != "" && (err != nil || cursor.Before < 0 || cursor.Before > src.total || cursor.Source != sourceID) { |
| 743 | return staleHistorySlice(src.revision, src.revKnown, src.digest), nil |
| 744 | } |
| 745 | if hasCursor && !src.identityMatches(cursor.Revision, cursor.RevKnown, cursor.Digest) { |
| 746 | return staleHistorySlice(src.revision, src.revKnown, src.digest), nil |
| 747 | } |
| 748 | hi := src.total |
| 749 | if hasCursor && cursor.Before < hi { |
| 750 | hi = cursor.Before |
| 751 | } |
| 752 | forward := req.Newer && hasCursor |
| 753 | if forward { |
| 754 | hi = min(src.total, cursor.Before+min(req.Entries, 500)) |
| 755 | } |
| 756 | page := HistorySlice{ |
| 757 | Entries: []HistoryEntry{}, |
| 758 | TotalTurns: src.totalTurns, |
| 759 | Revision: src.revision, |
| 760 | RevisionKnown: src.revKnown, |
| 761 | Digest: src.digest, |
| 762 | } |
| 763 | if hi <= 0 || src.total == 0 { |
| 764 | return page, nil |
| 765 | } |
| 766 | |
| 767 | candidateLo, hi, err := historySliceCandidateRange(src, req, cursor, hi, forward) |
| 768 | if err != nil { |
| 769 | return emptyHistorySlice(), err |
| 770 | } |
| 771 | |
| 772 | window, fetchErr := src.fetch(candidateLo, hi) |
| 773 | if fetchErr != nil { |
| 774 | return emptyHistorySlice(), fetchErr |
| 775 | } |
| 776 | if len(window) != hi-candidateLo { |
| 777 | return emptyHistorySlice(), fmt.Errorf("history window length %d, want %d", len(window), hi-candidateLo) |
| 778 | } |
| 779 | if !src.windowOnly { |
| 780 | window = historyWindowWithPersistedTimes(window, sessionPath, src.userCountBefore(candidateLo)) |
| 781 | } |
| 782 | toolResults := historyToolResultsByID(window) |
| 783 | if err := extendHistoryToolResults(src, window, hi, toolResults); err != nil { |
| 784 | return emptyHistorySlice(), err |
| 785 | } |
| 786 | |
| 787 | type entryGroup struct { |
| 788 | msgIndex int |
| 789 | entries []HistoryEntry |
| 790 | bytes int |
| 791 | } |
| 792 | groups := []entryGroup{} |
| 793 | entryCount, byteCount := 0, 0 |
| 794 | state := newHistoryMessageConvertState(plannerTurns) |
| 795 | if err := primeHistoryPlannerState(src, state, candidateLo, resolver); err != nil { |
| 796 | return emptyHistorySlice(), err |
| 797 | } |
| 798 | for i := candidateLo; i < hi; i++ { |
| 799 | m := window[i-candidateLo] |
| 800 | rows := state.convertHistoryMessage(i, m, resolver, checkpointTurns, toolResults) |
| 801 | if len(rows) == 0 { |
| 802 | continue |
| 803 | } |
| 804 | g := entryGroup{msgIndex: i, entries: make([]HistoryEntry, 0, len(rows))} |
| 805 | for sub, row := range rows { |
| 806 | entry := newHistoryEntry(src, fmt.Sprintf("s%s:r%d:m%d:o%d", src.sessionID, src.epoch, i, sub), i, sub, row) |
| 807 | g.bytes += entry.inlineBytes() |
| 808 | g.entries = append(g.entries, entry) |
| 809 | } |
| 810 | groups = append(groups, g) |
| 811 | entryCount += len(g.entries) |
| 812 | byteCount += g.bytes |
| 813 | if forward && len(groups) > 1 && (entryCount > req.Entries || byteCount > req.Bytes) { |
| 814 | groups = groups[:len(groups)-1] |
| 815 | hi = i |
| 816 | break |
| 817 | } |
| 818 | // Keep the newest suffix within budget; always keep the newest group |
| 819 | // so a single oversized message still makes progress. |
| 820 | for len(groups) > 1 && (entryCount > req.Entries || byteCount > req.Bytes) { |
| 821 | entryCount -= len(groups[0].entries) |
| 822 | byteCount -= groups[0].bytes |
| 823 | groups = groups[1:] |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | pageStart := candidateLo |
| 828 | if len(groups) > 0 { |
| 829 | pageStart = groups[0].msgIndex |
| 830 | } |
| 831 | for _, g := range groups { |
| 832 | page.Entries = append(page.Entries, g.entries...) |
| 833 | } |
| 834 | page = completeHistorySlicePage(page, src, pageStart, hi, sourceID) |
| 835 | return page, nil |
| 836 | } |
| 837 | |
| 838 | // countRoleBefore counts messages with role in [0, lo). |
| 839 | func countRoleBefore(roles []provider.Role, lo int, role provider.Role) int { |
| 840 | if lo > len(roles) { |
| 841 | lo = len(roles) |
| 842 | } |
| 843 | count := 0 |
| 844 | for i := range lo { |
| 845 | if roles[i] == role { |
| 846 | count++ |
| 847 | } |
| 848 | } |
| 849 | return count |
| 850 | } |
| 851 | |
| 852 | // extendHistoryToolResults fills in tool results for window tool calls whose |
| 853 | // result message lies past the window's newer edge (an intra-turn page cut), |
| 854 | // so tool-call summaries match the full-conversion output. It keeps no result |
| 855 | // body except one whose call is actually visible, but deliberately scans past |
| 856 | // arbitrary non-tool traffic: correctness cannot depend on a result arriving |
| 857 | // within a guessed distance. |
| 858 | func extendHistoryToolResults(src *historySliceSource, window []provider.Message, hi int, toolResults map[string]provider.Message) error { |
| 859 | var want map[string]bool |
| 860 | for _, m := range window { |
| 861 | for _, tc := range m.ToolCalls { |
| 862 | if tc.ID == "" { |
| 863 | continue |
| 864 | } |
| 865 | if _, ok := toolResults[tc.ID]; ok { |
| 866 | continue |
| 867 | } |
| 868 | if want == nil { |
| 869 | want = map[string]bool{} |
| 870 | } |
| 871 | want[tc.ID] = true |
| 872 | } |
| 873 | } |
| 874 | if len(want) == 0 { |
| 875 | return nil |
| 876 | } |
| 877 | for i := hi; i < src.total && len(want) > 0; i++ { |
| 878 | if src.roleAt(i) != provider.RoleTool { |
| 879 | continue |
| 880 | } |
| 881 | msgs, err := src.fetch(i, i+1) |
| 882 | if err != nil { |
| 883 | return err |
| 884 | } |
| 885 | if len(msgs) != 1 { |
| 886 | return fmt.Errorf("tool result window length %d, want 1", len(msgs)) |
| 887 | } |
| 888 | m := msgs[0] |
| 889 | if m.ToolCallID != "" && want[m.ToolCallID] { |
| 890 | toolResults[m.ToolCallID] = m |
| 891 | delete(want, m.ToolCallID) |
| 892 | } |
| 893 | } |
| 894 | return nil |
| 895 | } |
| 896 | |
| 897 | // forEachHistorySourceChunk decodes a bounded contiguous message window at a |
| 898 | // time. It is the common primitive for the cross-page lookups below; callers |
| 899 | // retain only their derived state, never the full transcript. |
| 900 | func forEachHistorySourceChunk(src *historySliceSource, end int, visit func([]provider.Message) error) error { |
| 901 | if end > src.total { |
| 902 | end = src.total |
| 903 | } |
| 904 | for lo := 0; lo < end; lo += historyLookupChunkMessages { |
| 905 | hi := min(lo+historyLookupChunkMessages, end) |
| 906 | msgs, err := src.fetch(lo, hi) |
| 907 | if err != nil { |
| 908 | return err |
| 909 | } |
| 910 | if len(msgs) != hi-lo { |
| 911 | return fmt.Errorf("history lookup window length %d, want %d", len(msgs), hi-lo) |
| 912 | } |
| 913 | if err := visit(msgs); err != nil { |
| 914 | return err |
| 915 | } |
| 916 | } |
| 917 | return nil |
| 918 | } |
| 919 | |
| 920 | // primeHistoryPlannerState consumes the non-rendered prefix so planner |
| 921 | // displays remain FIFO per duplicated user text and an interrupt's canonical |
| 922 | // suppression crosses page boundaries exactly as in a full conversion. |
| 923 | func primeHistoryPlannerState(src *historySliceSource, state *historyMessageConvertState, end int, resolver func(string) string) error { |
| 924 | if end <= 0 || len(state.plannerByUserHash) == 0 { |
| 925 | return nil |
| 926 | } |
| 927 | return forEachHistorySourceChunk(src, end, func(msgs []provider.Message) error { |
| 928 | for _, msg := range msgs { |
| 929 | state.consumeHistoryPlannerState(msg, resolver) |
| 930 | } |
| 931 | return nil |
| 932 | }) |
| 933 | } |
| 934 | |
| 935 | // newHistoryEntry builds one entry, replacing oversized string fields with |
| 936 | // preview + ref. entryID is the fully-built entry ID (message- or row-form). |
| 937 | func newHistoryEntry(src *historySliceSource, entryID string, msgIndex, sub int, row HistoryMessage) HistoryEntry { |
| 938 | entry := HistoryEntry{ |
| 939 | EntryID: entryID, |
| 940 | Turn: src.turnAt(msgIndex), |
| 941 | Order: msgIndex, |
| 942 | Message: row, |
| 943 | Refs: []HistoryContentRef{}, |
| 944 | } |
| 945 | addRef := func(field, toolCallID string, size, chunks int) { |
| 946 | entry.Refs = append(entry.Refs, HistoryContentRef{ |
| 947 | EntryID: entryID, |
| 948 | Field: field, |
| 949 | Size: size, |
| 950 | Chunks: chunks, |
| 951 | ToolCallID: toolCallID, |
| 952 | Revision: src.revision, |
| 953 | RevKnown: src.revKnown, |
| 954 | Digest: src.digest, |
| 955 | }) |
| 956 | } |
| 957 | m := &entry.Message |
| 958 | m.Content = truncateHistoryField(m.Content, "content", "", addRef) |
| 959 | m.Reasoning = truncateHistoryField(m.Reasoning, "reasoning", "", addRef) |
| 960 | m.SubmitText = truncateHistoryField(m.SubmitText, "submitText", "", addRef) |
| 961 | m.Detail = truncateHistoryField(m.Detail, "detail", "", addRef) |
| 962 | m.Code = truncateHistoryField(m.Code, "code", "", addRef) |
| 963 | m.Summary = truncateHistoryField(m.Summary, "summary", "", addRef) |
| 964 | m.Archive = truncateHistoryField(m.Archive, "archive", "", addRef) |
| 965 | m.ToolResultError = truncateHistoryField(m.ToolResultError, "toolResultError", "", addRef) |
| 966 | for i := range m.ToolCalls { |
| 967 | tc := &m.ToolCalls[i] |
| 968 | tc.Arguments = truncateHistoryField(tc.Arguments, "toolArguments", tc.ID, addRef) |
| 969 | tc.Subject = truncateHistoryField(tc.Subject, "toolSubject", tc.ID, addRef) |
| 970 | tc.Summary = truncateHistoryField(tc.Summary, "toolSummary", tc.ID, addRef) |
| 971 | tc.Diff = truncateHistoryField(tc.Diff, "toolDiff", tc.ID, addRef) |
| 972 | } |
| 973 | return entry |
| 974 | } |
| 975 | |
| 976 | // truncateHistoryField replaces value with a rune-safe preview and registers |
| 977 | // a content ref when it exceeds the inline threshold. |
| 978 | func truncateHistoryField(value, field, toolCallID string, addRef func(field, toolCallID string, size, chunks int)) string { |
| 979 | if len(value) <= historyInlineRefThreshold { |
| 980 | return value |
| 981 | } |
| 982 | addRef(field, toolCallID, len(value), historyContentChunkCount(value)) |
| 983 | return clipStringBytes(value, historyFieldPreviewBytes) |
| 984 | } |
| 985 | |
| 986 | // inlineBytes approximates the JSON payload contributed by the entry's inline |
| 987 | // string fields (post-truncation), for the byte budget. |
| 988 | func (e HistoryEntry) inlineBytes() int { |
| 989 | m := e.Message |
| 990 | n := len(m.Content) + len(m.Detail) + len(m.Code) + len(m.SubmitText) + |
| 991 | len(m.Reasoning) + len(m.Summary) + len(m.Archive) + len(m.ToolResultError) + |
| 992 | len(m.ToolCallID) + len(m.ToolName) + len(m.Role) |
| 993 | for _, tc := range m.ToolCalls { |
| 994 | n += len(tc.Arguments) + len(tc.Subject) + len(tc.Summary) + len(tc.Diff) + len(tc.ID) + len(tc.Name) |
| 995 | } |
| 996 | return n |
| 997 | } |
| 998 | |
| 999 | // historyWindowWithPersistedTimes is the window-scoped form of |
| 1000 | // historyProviderMessagesWithPersistedTimes: userOffset is the number of |
| 1001 | // user-role messages before the window, keeping the ordinal alignment with |
| 1002 | // the persisted user-message records. |
| 1003 | func historyWindowWithPersistedTimes(msgs []provider.Message, sessionPath string, userOffset int) []provider.Message { |
| 1004 | if len(msgs) == 0 || strings.TrimSpace(sessionPath) == "" { |
| 1005 | return msgs |
| 1006 | } |
| 1007 | needsPersistedTime := false |
| 1008 | for _, msg := range msgs { |
| 1009 | if msg.CreatedAt <= 0 && agent.IsUserAuthoredTurnMessage(msg) { |
| 1010 | needsPersistedTime = true |
| 1011 | break |
| 1012 | } |
| 1013 | } |
| 1014 | if !needsPersistedTime { |
| 1015 | return msgs |
| 1016 | } |
| 1017 | users, err := agent.LoadSessionUserMessages(sessionPath) |
| 1018 | if err != nil || len(users) <= userOffset { |
| 1019 | return msgs |
| 1020 | } |
| 1021 | out := append([]provider.Message(nil), msgs...) |
| 1022 | userIndex := userOffset |
| 1023 | for i := range out { |
| 1024 | if out[i].Role != provider.RoleUser || agent.IsPinnedContextRevision(out[i]) { |
| 1025 | continue |
| 1026 | } |
| 1027 | if userIndex >= len(users) { |
| 1028 | break |
| 1029 | } |
| 1030 | user := users[userIndex] |
| 1031 | userIndex++ |
| 1032 | if out[i].CreatedAt <= 0 && !user.At.IsZero() { |
| 1033 | out[i].CreatedAt = user.At.UnixMilli() |
| 1034 | } |
| 1035 | } |
| 1036 | return out |
| 1037 | } |
| 1038 | |
| 1039 | // historyContentChunkCount returns the number of rune-aligned ≤256KiB chunks |
| 1040 | // for s. The empty string is one empty chunk. |
| 1041 | func historyContentChunkCount(s string) int { |
| 1042 | if len(s) == 0 { |
| 1043 | return 1 |
| 1044 | } |
| 1045 | chunks := 0 |
| 1046 | for off := 0; off < len(s); chunks++ { |
| 1047 | off = historyContentChunkEnd(s, off) |
| 1048 | } |
| 1049 | return chunks |
| 1050 | } |
| 1051 | |
| 1052 | // historyContentChunkEnd returns the end offset of the chunk starting at off: |
| 1053 | // off+256KiB backed off to a rune boundary. |
| 1054 | func historyContentChunkEnd(s string, off int) int { |
| 1055 | end := off + historyContentChunkBytes |
| 1056 | if end >= len(s) { |
| 1057 | return len(s) |
| 1058 | } |
| 1059 | for end > off && !utf8.RuneStart(s[end]) { |
| 1060 | end-- |
| 1061 | } |
| 1062 | return end |
| 1063 | } |
| 1064 | |
| 1065 | // historyContentChunkAt returns chunk index (0-based) of s and the total |
| 1066 | // chunk count, splitting on rune boundaries. |
| 1067 | func historyContentChunkAt(s string, index int) (string, int) { |
| 1068 | chunks := historyContentChunkCount(s) |
| 1069 | if index < 0 { |
| 1070 | index = 0 |
| 1071 | } |
| 1072 | off := 0 |
| 1073 | for i := 0; i < index && off < len(s); i++ { |
| 1074 | off = historyContentChunkEnd(s, off) |
| 1075 | } |
| 1076 | if off >= len(s) { |
| 1077 | return "", chunks |
| 1078 | } |
| 1079 | return s[off:historyContentChunkEnd(s, off)], chunks |
| 1080 | } |
| 1081 | |
| 1082 | // HistoryContentForTab returns one chunk of a ref-replaced field's full |
| 1083 | // value. The entry is re-resolved through the same window machinery; when the |
| 1084 | // session's revision/digest moved past the ref, Stale is set so the frontend |
| 1085 | // reloads. |
| 1086 | func (a *App) HistoryContentForTab(tabID string, ref HistoryContentRef, chunkIndex int) HistoryContentChunk { |
| 1087 | if ref.ReadHandleID != "" { |
| 1088 | return a.boundNativeHistoryContent(tabID, ref, chunkIndex) |
| 1089 | } |
| 1090 | out := HistoryContentChunk{EntryID: ref.EntryID, Field: ref.Field, Chunk: max(chunkIndex, 0)} |
| 1091 | msgIndex, sub, legacyRow, ok := parseHistoryEntryID(ref.EntryID) |
| 1092 | if !ok { |
| 1093 | out.Done = true |
| 1094 | return out |
| 1095 | } |
| 1096 | a.mu.RLock() |
| 1097 | tab := a.tabByIDLocked(tabID) |
| 1098 | var ctrl control.SessionAPI |
| 1099 | var sessionDir, sessionPath, sessionID string |
| 1100 | if tab != nil { |
| 1101 | ctrl = tab.Ctrl |
| 1102 | sessionDir = tabSessionDir(tab) |
| 1103 | sessionPath = tab.currentSessionPath() |
| 1104 | sessionID = strings.TrimSpace(tab.SessionID) |
| 1105 | } |
| 1106 | a.mu.RUnlock() |
| 1107 | if ctrl == nil && sessionID != "" { |
| 1108 | return a.canonicalHistoryContentBeforeController(tabID, sessionDir, sessionPath, sessionID, msgIndex, sub, ref, chunkIndex, out) |
| 1109 | } |
| 1110 | if ctrl != nil { |
| 1111 | if identity, ok := ctrl.(control.IdentityLifecycle); ok && identity.UsesExclusiveSession() { |
| 1112 | sessionRef, bound := identity.SessionRef() |
| 1113 | service := identity.SessionService() |
| 1114 | if !bound || service == nil || service.Query() == nil || entryIDSession(ref.EntryID) != sessionRef.SessionID { |
| 1115 | out.Stale = true |
| 1116 | return out |
| 1117 | } |
| 1118 | src, err := canonicalHistorySliceSource(service.Query(), sessionRef) |
| 1119 | if err != nil || !src.identityMatches(ref.Revision, ref.RevKnown, ref.Digest) { |
| 1120 | out.Stale = true |
| 1121 | return out |
| 1122 | } |
| 1123 | value, found, stale := a.historyFieldValueForSource(src, msgIndex, sub, ref, sessionDisplayResolver(sessionDir, sessionPath), nil, nil) |
| 1124 | if stale || !found || len(value) != ref.Size { |
| 1125 | out.Stale = true |
| 1126 | return out |
| 1127 | } |
| 1128 | data, chunks := historyContentChunkAt(value, chunkIndex) |
| 1129 | out.Chunks = chunks |
| 1130 | out.Data = data |
| 1131 | out.Done = chunkIndex >= chunks-1 |
| 1132 | return out |
| 1133 | } |
| 1134 | } |
| 1135 | if ctrl != nil { |
| 1136 | if p := ctrl.SessionPath(); strings.TrimSpace(p) != "" { |
| 1137 | sessionPath = p |
| 1138 | sessionDir = controllerSessionDir(ctrl) |
| 1139 | } |
| 1140 | } |
| 1141 | if strings.TrimSpace(sessionPath) == "" { |
| 1142 | out.Done = true |
| 1143 | return out |
| 1144 | } |
| 1145 | resolvedSessionID := strings.TrimSuffix(filepath.Base(sessionPath), ".jsonl") |
| 1146 | if entryIDSession(ref.EntryID) != resolvedSessionID { |
| 1147 | out.Stale = true |
| 1148 | return out |
| 1149 | } |
| 1150 | |
| 1151 | var value string |
| 1152 | var found bool |
| 1153 | if legacyRow >= 0 { |
| 1154 | value, found = a.legacyHistoryFieldValue(sessionPath, sessionDir, legacyRow, ref) |
| 1155 | } else if ctrl != nil { |
| 1156 | var stale bool |
| 1157 | value, found, stale = a.liveHistoryFieldValue(ctrl, sessionDir, sessionPath, msgIndex, sub, ref) |
| 1158 | if stale { |
| 1159 | out.Stale = true |
| 1160 | return out |
| 1161 | } |
| 1162 | } else { |
| 1163 | var stale bool |
| 1164 | value, found, stale = a.coldHistoryFieldValue(sessionDir, sessionPath, msgIndex, sub, ref) |
| 1165 | if stale { |
| 1166 | out.Stale = true |
| 1167 | return out |
| 1168 | } |
| 1169 | } |
| 1170 | if !found { |
| 1171 | // The entry or field no longer resolves — content changed underneath. |
| 1172 | out.Stale = true |
| 1173 | return out |
| 1174 | } |
| 1175 | if len(value) != ref.Size { |
| 1176 | out.Stale = true |
| 1177 | return out |
| 1178 | } |
| 1179 | data, chunks := historyContentChunkAt(value, chunkIndex) |
| 1180 | out.Chunks = chunks |
| 1181 | out.Data = data |
| 1182 | out.Done = chunkIndex >= chunks-1 |
| 1183 | return out |
| 1184 | } |
| 1185 | |
| 1186 | // HistoryContentForTarget re-resolves one compatibility-history content |
| 1187 | // capability against the explicit durable target. It never consults the |
| 1188 | // selected tab or creates a controller. |
| 1189 | func (a *App) HistoryContentForTarget(selector SessionSelector, ref HistoryContentRef, chunkIndex int) (HistoryContentChunk, error) { |
| 1190 | out := HistoryContentChunk{EntryID: ref.EntryID, Field: ref.Field, Chunk: max(chunkIndex, 0)} |
| 1191 | if ref.ReadHandleID != "" { |
| 1192 | // This ref belongs to a navigation reader, not a management target. |
| 1193 | out.Stale = true |
| 1194 | return out, nil |
| 1195 | } |
| 1196 | target, err := a.resolveSessionTargetWithArchived(selector, true) |
| 1197 | if err != nil { |
| 1198 | return out, err |
| 1199 | } |
| 1200 | msgIndex, sub, legacyRow, ok := parseHistoryEntryID(ref.EntryID) |
| 1201 | if !ok { |
| 1202 | out.Done = true |
| 1203 | return out, nil |
| 1204 | } |
| 1205 | if target.SessionRef.SessionID != "" { |
| 1206 | if entryIDSession(ref.EntryID) != target.SessionRef.SessionID { |
| 1207 | out.Stale = true |
| 1208 | return out, nil |
| 1209 | } |
| 1210 | src, sourceErr := canonicalHistorySliceSource(a.desktopSessionService("").Query(), target.SessionRef) |
| 1211 | if sourceErr != nil || !src.identityMatches(ref.Revision, ref.RevKnown, ref.Digest) { |
| 1212 | out.Stale = true |
| 1213 | return out, nil |
| 1214 | } |
| 1215 | value, found, stale := a.historyFieldValueForSource( |
| 1216 | src, |
| 1217 | msgIndex, |
| 1218 | sub, |
| 1219 | ref, |
| 1220 | sessionDisplayResolver("", target.SessionPath), |
| 1221 | nil, |
| 1222 | nil, |
| 1223 | ) |
| 1224 | if stale || !found || len(value) != ref.Size { |
| 1225 | out.Stale = true |
| 1226 | return out, nil |
| 1227 | } |
| 1228 | out.Data, out.Chunks = historyContentChunkAt(value, chunkIndex) |
| 1229 | out.Done = chunkIndex >= out.Chunks-1 |
| 1230 | return out, nil |
| 1231 | } |
| 1232 | sessionDir, sessionPath, pathErr := a.sessionDirForPath(target.SessionPath) |
| 1233 | if pathErr != nil { |
| 1234 | return out, newSessionOperationError(sessionOperationTargetNotFound, "The session no longer exists.") |
| 1235 | } |
| 1236 | if entryIDSession(ref.EntryID) != strings.TrimSuffix(filepath.Base(sessionPath), ".jsonl") { |
| 1237 | out.Stale = true |
| 1238 | return out, nil |
| 1239 | } |
| 1240 | var ( |
| 1241 | value string |
| 1242 | found bool |
| 1243 | stale bool |
| 1244 | ) |
| 1245 | if legacyRow >= 0 { |
| 1246 | value, found = a.legacyHistoryFieldValue(sessionPath, sessionDir, legacyRow, ref) |
| 1247 | } else { |
| 1248 | value, found, stale = a.coldHistoryFieldValue(sessionDir, sessionPath, msgIndex, sub, ref) |
| 1249 | } |
| 1250 | if stale || !found || len(value) != ref.Size { |
| 1251 | out.Stale = true |
| 1252 | return out, nil |
| 1253 | } |
| 1254 | out.Data, out.Chunks = historyContentChunkAt(value, chunkIndex) |
| 1255 | out.Done = chunkIndex >= out.Chunks-1 |
| 1256 | return out, nil |
| 1257 | } |
| 1258 | |
| 1259 | // parseHistoryEntryID parses s<id>:r<epoch>:m<msgIndex>:o<sub> and the legacy |
| 1260 | // event-format s<id>:r<epoch>:e<row>:o0 form. |
| 1261 | func parseHistoryEntryID(entryID string) (msgIndex, sub, legacyRow int, ok bool) { |
| 1262 | legacyRow = -1 |
| 1263 | parts := strings.Split(entryID, ":") |
| 1264 | if len(parts) != 4 { |
| 1265 | return 0, 0, -1, false |
| 1266 | } |
| 1267 | if _, err := fmt.Sscanf(parts[2], "m%d", &msgIndex); err == nil { |
| 1268 | if _, err := fmt.Sscanf(parts[3], "o%d", &sub); err != nil { |
| 1269 | return 0, 0, -1, false |
| 1270 | } |
| 1271 | return msgIndex, sub, -1, true |
| 1272 | } |
| 1273 | if _, err := fmt.Sscanf(parts[2], "e%d", &legacyRow); err == nil { |
| 1274 | return 0, 0, legacyRow, true |
| 1275 | } |
| 1276 | return 0, 0, -1, false |
| 1277 | } |
| 1278 | |
| 1279 | func entryIDSession(entryID string) string { |
| 1280 | rest := strings.SplitN(entryID, ":", 2) |
| 1281 | if len(rest) != 2 { |
| 1282 | return "" |
| 1283 | } |
| 1284 | return strings.TrimPrefix(rest[0], "s") |
| 1285 | } |
| 1286 | |
| 1287 | // liveHistoryFieldValue re-resolves one entry's field from the live session. |
| 1288 | func (a *App) liveHistoryFieldValue(ctrl control.SessionAPI, sessionDir, sessionPath string, msgIndex, sub int, ref HistoryContentRef) (string, bool, bool) { |
| 1289 | wc, ok := ctrl.(historyWindowController) |
| 1290 | if !ok { |
| 1291 | return "", false, true |
| 1292 | } |
| 1293 | ps, psOK := wc.SessionPersistedState() |
| 1294 | revKnown := psOK && ps.RevisionKnown |
| 1295 | revision := int64(0) |
| 1296 | digest := "" |
| 1297 | if psOK { |
| 1298 | revision = ps.Revision |
| 1299 | digest = ps.DigestHex |
| 1300 | } |
| 1301 | if !psOK || revKnown != ref.RevKnown || revision != ref.Revision || digest != ref.Digest { |
| 1302 | return "", false, true |
| 1303 | } |
| 1304 | resolver := sessionDisplayResolver(sessionDir, sessionPath) |
| 1305 | src, _ := a.liveHistorySliceSource(ctrl, sessionPath, resolver) |
| 1306 | if src == nil { |
| 1307 | return "", false, true |
| 1308 | } |
| 1309 | return a.historyFieldValueForSource(src, msgIndex, sub, ref, resolver, sessionPlannerDisplayTurns(sessionDir, sessionPath), ctrl.CheckpointTurnsByMessageIndex()) |
| 1310 | } |
| 1311 | |
| 1312 | // coldHistoryFieldValue re-resolves one entry's field through the same |
| 1313 | // authoritative source selection as HistorySliceForTab. It never trusts a |
| 1314 | // stale checkpoint merely because the requested message's old offset exists. |
| 1315 | func (a *App) coldHistoryFieldValue(sessionDir, sessionPath string, msgIndex, sub int, ref HistoryContentRef) (string, bool, bool) { |
| 1316 | sessionDir, absPath, err := a.historyReadSource(sessionDir, sessionPath) |
| 1317 | if err != nil { |
| 1318 | return "", false, true |
| 1319 | } |
| 1320 | var value string |
| 1321 | var found, stale, handled bool |
| 1322 | err = a.withNativeHistoryPager(a.bootContext(), absPath, "", func(ctx context.Context, pager *agent.DisplayPager, sourceID string) error { |
| 1323 | handled = true |
| 1324 | src := historySourceFromPager(ctx, pager, absPath, sourceID) |
| 1325 | value, found, stale = a.historyFieldValueForSource(src, msgIndex, sub, ref, |
| 1326 | sessionDisplayResolver(sessionDir, absPath), sessionPlannerDisplayTurns(sessionDir, absPath), nil) |
| 1327 | return src.readErr |
| 1328 | }) |
| 1329 | if handled || nativeHistoryPreparationFailure(err) { |
| 1330 | return value, found, stale || err != nil |
| 1331 | } |
| 1332 | // Formats not handled by the native pager retain their compatibility |
| 1333 | // reader. A failed read on an admitted native source never falls back. |
| 1334 | info, err := os.Stat(absPath) |
| 1335 | if err != nil { |
| 1336 | return "", false, true |
| 1337 | } |
| 1338 | resolver := sessionDisplayResolver(sessionDir, absPath) |
| 1339 | idx, idxErr := agent.LoadSessionDisplayIndex(store.SessionDisplayIndex(absPath)) |
| 1340 | identity, identityKnown, identityErr := agent.SessionContentIdentity(absPath) |
| 1341 | if identityErr != nil { |
| 1342 | return "", false, true |
| 1343 | } |
| 1344 | valid := idxErr == nil && idx != nil && idx.TranscriptSize == info.Size() && historyIndexTimestampValid(store.SessionDisplayIndex(absPath), absPath, info, idx, true) |
| 1345 | if valid && identityKnown { |
| 1346 | valid = agent.ValidateSessionDisplayIndex(idx, identity.Revision, identity.RevisionKnown, identity.Digest, info.Size()) |
| 1347 | } else if valid { |
| 1348 | valid = !idx.RevisionKnown |
| 1349 | } |
| 1350 | var src *historySliceSource |
| 1351 | if valid { |
| 1352 | src = coldHistorySliceSource(absPath, idx) |
| 1353 | } else if scanned, scanErr := agent.ScanSessionDisplayIndex(absPath); scanErr == nil && (!identityKnown || scanned.ContentDigest == identity.DigestHex) { |
| 1354 | if identityKnown { |
| 1355 | scanned.Revision = identity.Revision |
| 1356 | scanned.RevisionKnown = identity.RevisionKnown |
| 1357 | } |
| 1358 | _ = agent.WriteSessionDisplayIndex(store.SessionDisplayIndex(absPath), scanned) |
| 1359 | src = coldHistorySliceSource(absPath, scanned) |
| 1360 | } else { |
| 1361 | messages, state, repairable, loadErr := agent.LoadSessionDisplayMessages(absPath) |
| 1362 | if loadErr != nil || !repairable { |
| 1363 | return "", false, true |
| 1364 | } |
| 1365 | src = newInMemoryHistorySliceSource(strings.TrimSuffix(filepath.Base(absPath), ".jsonl"), messages, resolver, state, true) |
| 1366 | } |
| 1367 | return a.historyFieldValueForSource(src, msgIndex, sub, ref, resolver, sessionPlannerDisplayTurns(sessionDir, absPath), nil) |
| 1368 | } |
| 1369 | |
| 1370 | func (a *App) historyFieldValueForSource(src *historySliceSource, msgIndex, sub int, ref HistoryContentRef, resolver func(string) string, plannerTurns []plannerDisplayTurn, checkpointTurns map[int]int) (string, bool, bool) { |
| 1371 | if src == nil || !src.identityMatches(ref.Revision, ref.RevKnown, ref.Digest) || msgIndex < 0 || msgIndex >= src.total { |
| 1372 | return "", false, true |
| 1373 | } |
| 1374 | msgs, err := src.fetch(msgIndex, msgIndex+1) |
| 1375 | if err != nil || len(msgs) != 1 { |
| 1376 | return "", false, true |
| 1377 | } |
| 1378 | toolResults := historyToolResultsByID(msgs) |
| 1379 | if err := extendHistoryToolResults(src, msgs, msgIndex+1, toolResults); err != nil { |
| 1380 | return "", false, true |
| 1381 | } |
| 1382 | state := newHistoryMessageConvertState(plannerTurns) |
| 1383 | if err := primeHistoryPlannerState(src, state, msgIndex, resolver); err != nil { |
| 1384 | return "", false, true |
| 1385 | } |
| 1386 | rows := state.convertHistoryMessage(msgIndex, msgs[0], resolver, checkpointTurns, toolResults) |
| 1387 | if sub < 0 || sub >= len(rows) { |
| 1388 | return "", false, true |
| 1389 | } |
| 1390 | value, found := historyEntryFieldValue(&rows[sub], ref.Field, ref.ToolCallID) |
| 1391 | return value, found, false |
| 1392 | } |
| 1393 | |
| 1394 | // historyEntryFieldValue reads one field of a converted row by ref field name. |
| 1395 | func historyEntryFieldValue(m *HistoryMessage, field, toolCallID string) (string, bool) { |
| 1396 | switch field { |
| 1397 | case "content": |
| 1398 | return m.Content, true |
| 1399 | case "reasoning": |
| 1400 | return m.Reasoning, true |
| 1401 | case "submitText": |
| 1402 | return m.SubmitText, true |
| 1403 | case "detail": |
| 1404 | return m.Detail, true |
| 1405 | case "code": |
| 1406 | return m.Code, true |
| 1407 | case "summary": |
| 1408 | return m.Summary, true |
| 1409 | case "archive": |
| 1410 | return m.Archive, true |
| 1411 | case "toolResultError": |
| 1412 | return m.ToolResultError, true |
| 1413 | case "toolArguments", "toolSubject", "toolSummary", "toolDiff": |
| 1414 | for i := range m.ToolCalls { |
| 1415 | if m.ToolCalls[i].ID != toolCallID { |
| 1416 | continue |
| 1417 | } |
| 1418 | switch field { |
| 1419 | case "toolArguments": |
| 1420 | return m.ToolCalls[i].Arguments, true |
| 1421 | case "toolSubject": |
| 1422 | return m.ToolCalls[i].Subject, true |
| 1423 | case "toolSummary": |
| 1424 | return m.ToolCalls[i].Summary, true |
| 1425 | case "toolDiff": |
| 1426 | return m.ToolCalls[i].Diff, true |
| 1427 | } |
| 1428 | } |
| 1429 | return "", false |
| 1430 | } |
| 1431 | return "", false |
| 1432 | } |
| 1433 | |
| 1434 | // --- Legacy event-format paging ------------------------------------------- |
| 1435 | |
| 1436 | // coldEventHistorySlice pages a legacy event-record session. The decode |
| 1437 | // streams the file once per request (constant memory); only ancient sessions |
| 1438 | // take this path. |
| 1439 | func coldEventHistorySlice(sessionPath string, info os.FileInfo, req HistorySliceRequest) (HistorySlice, error) { |
| 1440 | messages, ok, err := previewEventSessionMessages(sessionPath) |
| 1441 | if err != nil || !ok { |
| 1442 | return emptyHistorySlice(), err |
| 1443 | } |
| 1444 | digest := fmt.Sprintf("event:%d:%d", info.Size(), info.ModTime().UnixNano()) |
| 1445 | src := &historySliceSource{ |
| 1446 | sessionID: strings.TrimSuffix(filepath.Base(sessionPath), ".jsonl"), |
| 1447 | digest: digest, |
| 1448 | } |
| 1449 | return pageHistoryEventRows(src, messages, req), nil |
| 1450 | } |
| 1451 | |
| 1452 | // pageHistoryEventRows cuts a page from already-converted rows (legacy event |
| 1453 | // format). Row indexes play the role of message indexes; every row is its own |
| 1454 | // group. Turns count user rows, 1-based. |
| 1455 | func pageHistoryEventRows(src *historySliceSource, rows []HistoryMessage, req HistorySliceRequest) HistorySlice { |
| 1456 | cursor, err := decodeHistorySliceCursor(req.Cursor) |
| 1457 | hasCursor := req.Cursor != "" && err == nil |
| 1458 | if hasCursor && src.digest != cursor.Digest { |
| 1459 | return staleHistorySlice(0, false, src.digest) |
| 1460 | } |
| 1461 | hi := len(rows) |
| 1462 | if hasCursor && cursor.Before < hi { |
| 1463 | hi = cursor.Before |
| 1464 | } |
| 1465 | // Visible turn per row. |
| 1466 | turns := make([]int, len(rows)) |
| 1467 | turn := 0 |
| 1468 | for i, r := range rows { |
| 1469 | if r.Role == "user" { |
| 1470 | turn++ |
| 1471 | } |
| 1472 | turns[i] = turn |
| 1473 | } |
| 1474 | src.turns = turns |
| 1475 | src.totalTurns = turn |
| 1476 | src.total = len(rows) |
| 1477 | page := HistorySlice{Entries: []HistoryEntry{}, TotalTurns: turn, Digest: src.digest} |
| 1478 | if hi <= 0 { |
| 1479 | return page |
| 1480 | } |
| 1481 | newestTurn := turns[hi-1] |
| 1482 | oldestTurn := 0 |
| 1483 | if newestTurn > 0 { |
| 1484 | oldestTurn = max(newestTurn-req.Turns+1, 1) |
| 1485 | } |
| 1486 | candidateLo := sort.Search(hi, func(i int) bool { return turns[i] >= oldestTurn }) |
| 1487 | if oldestTurn <= 1 { |
| 1488 | candidateLo = 0 |
| 1489 | } |
| 1490 | // Suffix cut: walk backward from the newest row, keeping whole rows until |
| 1491 | // a budget is reached; always keep the newest row so a single oversized |
| 1492 | // row still makes progress. |
| 1493 | kept := make([]HistoryEntry, 0, req.Entries) |
| 1494 | entryCount, byteCount := 0, 0 |
| 1495 | lo := hi |
| 1496 | for i := hi - 1; i >= candidateLo; i-- { |
| 1497 | entry := newHistoryEntry(src, fmt.Sprintf("s%s:r0:e%d:o0", src.sessionID, i), i, 0, rows[i]) |
| 1498 | b := entry.inlineBytes() |
| 1499 | if len(kept) > 0 && (entryCount+1 > req.Entries || byteCount+b > req.Bytes) { |
| 1500 | break |
| 1501 | } |
| 1502 | kept = append(kept, entry) |
| 1503 | entryCount++ |
| 1504 | byteCount += b |
| 1505 | lo = i |
| 1506 | } |
| 1507 | for _, e := range slices.Backward(kept) { |
| 1508 | page.Entries = append(page.Entries, e) |
| 1509 | } |
| 1510 | for _, e := range page.Entries { |
| 1511 | if e.Turn <= 0 { |
| 1512 | continue |
| 1513 | } |
| 1514 | if page.StartTurn == 0 || e.Turn < page.StartTurn { |
| 1515 | page.StartTurn = e.Turn |
| 1516 | } |
| 1517 | if e.Turn > page.EndTurn { |
| 1518 | page.EndTurn = e.Turn |
| 1519 | } |
| 1520 | } |
| 1521 | page.HasOlder = lo > 0 |
| 1522 | if page.HasOlder { |
| 1523 | page.NextCursor = encodeHistorySliceCursor(historySliceCursor{V: 1, Digest: src.digest, Before: lo}) |
| 1524 | } |
| 1525 | return page |
| 1526 | } |
| 1527 | |
| 1528 | // legacyHistoryFieldValue re-resolves a field of a legacy event-format row. |
| 1529 | func (a *App) legacyHistoryFieldValue(sessionPath, sessionDir string, row int, ref HistoryContentRef) (string, bool) { |
| 1530 | absPath, _, err := validateSessionPath(sessionDir, sessionPath) |
| 1531 | if err != nil { |
| 1532 | return "", false |
| 1533 | } |
| 1534 | messages, ok, err := previewEventSessionMessages(absPath) |
| 1535 | if err != nil || !ok || row < 0 || row >= len(messages) { |
| 1536 | return "", false |
| 1537 | } |
| 1538 | return historyEntryFieldValue(&messages[row], ref.Field, ref.ToolCallID) |
| 1539 | } |
| 1540 |