| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/json" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "net/http" |
| 9 | "net/url" |
| 10 | "sort" |
| 11 | "strings" |
| 12 | "sync" |
| 13 | "time" |
| 14 | |
| 15 | "reasonix/internal/agent" |
| 16 | "reasonix/internal/event" |
| 17 | ) |
| 18 | |
| 19 | // errRemoteTabStatusSuperseded marks the benign lost race where a /status |
| 20 | // response lands after SSE-derived runtime state already advanced the tab |
| 21 | // revision. Adoption was correctly skipped; callers (watchdog, close policy) |
| 22 | // merely skip the snapshot instead of surfacing a crash. |
| 23 | var errRemoteTabStatusSuperseded = errors.New("status was superseded by newer runtime state") |
| 24 | |
| 25 | type RemoteTabSnapshot struct { |
| 26 | History json.RawMessage `json:"history"` |
| 27 | Context json.RawMessage `json:"context,omitempty"` |
| 28 | Todos json.RawMessage `json:"todos,omitempty"` |
| 29 | Checkpoints json.RawMessage `json:"checkpoints,omitempty"` |
| 30 | Models json.RawMessage `json:"models,omitempty"` |
| 31 | Commands json.RawMessage `json:"commands,omitempty"` |
| 32 | Status json.RawMessage `json:"status,omitempty"` |
| 33 | PendingEvents []json.RawMessage `json:"pendingEvents,omitempty"` |
| 34 | } |
| 35 | |
| 36 | // sanitizeRemoteHistory keeps older Serve builds from leaking provider-only |
| 37 | // transient blocks into the desktop transcript. |
| 38 | func sanitizeRemoteHistory(body []byte) []byte { |
| 39 | var rows []map[string]json.RawMessage |
| 40 | if json.Unmarshal(body, &rows) != nil { |
| 41 | return body |
| 42 | } |
| 43 | changed := false |
| 44 | for _, row := range rows { |
| 45 | var role, content string |
| 46 | if json.Unmarshal(row["role"], &role) != nil || role != "user" || json.Unmarshal(row["content"], &content) != nil { |
| 47 | continue |
| 48 | } |
| 49 | clean := agent.UserPreviewText(content) |
| 50 | if clean == content { |
| 51 | continue |
| 52 | } |
| 53 | encoded, err := json.Marshal(clean) |
| 54 | if err == nil { |
| 55 | row["content"] = encoded |
| 56 | changed = true |
| 57 | } |
| 58 | } |
| 59 | if !changed { |
| 60 | return body |
| 61 | } |
| 62 | var out bytes.Buffer |
| 63 | encoder := json.NewEncoder(&out) |
| 64 | encoder.SetEscapeHTML(false) |
| 65 | if encoder.Encode(rows) != nil { |
| 66 | return body |
| 67 | } |
| 68 | return bytes.TrimSpace(out.Bytes()) |
| 69 | } |
| 70 | |
| 71 | // RemoteTabSnapshot merges the serve's GET members in parallel. Only |
| 72 | // /history is required; the optional members degrade to absent on failure. |
| 73 | func (a *App) RemoteTabSnapshot(tabID string) (RemoteTabSnapshot, error) { |
| 74 | return a.remoteTabSnapshot(tabID, true) |
| 75 | } |
| 76 | |
| 77 | // RemoteTabMetadata loads ancillary state without transferring transcript bodies. |
| 78 | func (a *App) RemoteTabMetadata(tabID string) (RemoteTabSnapshot, error) { |
| 79 | return a.remoteTabSnapshot(tabID, false) |
| 80 | } |
| 81 | |
| 82 | func (a *App) remoteTabSnapshot(tabID string, includeHistory bool) (RemoteTabSnapshot, error) { |
| 83 | client, base, err := a.remoteTabCommandClient(tabID) |
| 84 | if err != nil { |
| 85 | return RemoteTabSnapshot{}, err |
| 86 | } |
| 87 | gen := a.remoteTabClientGeneration(tabID, client) |
| 88 | statusSeq := a.reserveRemoteTabStatusSequence(tabID, client, gen) |
| 89 | ctx, cancel := commandContext(a) |
| 90 | defer cancel() |
| 91 | var snap RemoteTabSnapshot |
| 92 | var wg sync.WaitGroup |
| 93 | var mu sync.Mutex |
| 94 | var historyErr error |
| 95 | // A spectator pinned to a taken-over session reads the mirrored file view |
| 96 | // for history and status; the other members stay on the foreground. |
| 97 | sessionQuery := "" |
| 98 | a.remoteTabMu.Lock() |
| 99 | if tab := a.remoteTabs[tabID]; tab != nil && tab.session.takenOver && strings.TrimSpace(tab.routing.currentPath) != "" { |
| 100 | sessionQuery = "?session=" + url.QueryEscape(tab.routing.currentPath) |
| 101 | } |
| 102 | a.remoteTabMu.Unlock() |
| 103 | for path, dst := range map[string]*json.RawMessage{ |
| 104 | "/history": &snap.History, |
| 105 | "/context": &snap.Context, |
| 106 | "/todos": &snap.Todos, |
| 107 | "/checkpoints": &snap.Checkpoints, |
| 108 | "/models": &snap.Models, |
| 109 | "/commands": &snap.Commands, |
| 110 | "/status": &snap.Status, |
| 111 | } { |
| 112 | if path == "/history" && !includeHistory { |
| 113 | continue |
| 114 | } |
| 115 | wg.Add(1) |
| 116 | go func(path string, dst *json.RawMessage) { |
| 117 | defer wg.Done() |
| 118 | switch path { |
| 119 | case "/history", "/status": |
| 120 | path += sessionQuery |
| 121 | } |
| 122 | data, err := serveGet(ctx, client, serveURL(base, path)) |
| 123 | mu.Lock() |
| 124 | defer mu.Unlock() |
| 125 | if err != nil { |
| 126 | if path == "/history" && historyErr == nil { |
| 127 | historyErr = err |
| 128 | } |
| 129 | return |
| 130 | } |
| 131 | *dst = data |
| 132 | }(path, dst) |
| 133 | } |
| 134 | wg.Wait() |
| 135 | if historyErr != nil { |
| 136 | return RemoteTabSnapshot{}, historyErr |
| 137 | } |
| 138 | if includeHistory && len(snap.History) == 0 { |
| 139 | return RemoteTabSnapshot{}, fmt.Errorf("remote tab %q: empty history", tabID) |
| 140 | } |
| 141 | snap.History = sanitizeRemoteHistory(snap.History) |
| 142 | if len(snap.Status) > 0 && !a.recordRemoteTabSessionStatus(tabID, client, gen, statusSeq, snap.Status) { |
| 143 | // Do not hand a status member captured before a newer request/event to |
| 144 | // the frontend aggregate snapshot; it will fetch /status explicitly. |
| 145 | snap.Status = nil |
| 146 | } |
| 147 | a.remoteTabMu.Lock() |
| 148 | tab := a.remoteTabs[tabID] |
| 149 | if tab == nil || tab.client != client || tab.gen != gen || tab.state != "ready" { |
| 150 | a.remoteTabMu.Unlock() |
| 151 | return RemoteTabSnapshot{}, fmt.Errorf("remote tab %q changed while loading snapshot", tabID) |
| 152 | } |
| 153 | keys := make([]string, 0, len(tab.pendingEvents)) |
| 154 | for key := range tab.pendingEvents { |
| 155 | keys = append(keys, key) |
| 156 | } |
| 157 | sort.Strings(keys) |
| 158 | for _, key := range keys { |
| 159 | snap.PendingEvents = append(snap.PendingEvents, append(json.RawMessage(nil), tab.pendingEvents[key]...)) |
| 160 | } |
| 161 | a.remoteTabMu.Unlock() |
| 162 | a.recordRemoteTabModelCatalog(tabID, client, gen, snap.Models) |
| 163 | return snap, nil |
| 164 | } |
| 165 | |
| 166 | // RemoteTabStatus is the small status-only binding used by watchdog and close |
| 167 | // policy polling. It deliberately avoids transferring full history. |
| 168 | func (a *App) RemoteTabStatus(tabID string) (json.RawMessage, error) { |
| 169 | client, base, err := a.remoteTabCommandClient(tabID) |
| 170 | if err != nil { |
| 171 | return nil, err |
| 172 | } |
| 173 | gen := a.remoteTabClientGeneration(tabID, client) |
| 174 | statusSeq := a.reserveRemoteTabStatusSequence(tabID, client, gen) |
| 175 | ctx, cancel := commandContext(a) |
| 176 | defer cancel() |
| 177 | status, err := serveGet(ctx, client, serveURL(base, a.remoteTabStatusURL(tabID))) |
| 178 | if err == nil { |
| 179 | if !a.recordRemoteTabSessionStatus(tabID, client, gen, statusSeq, status) { |
| 180 | return nil, fmt.Errorf("remote tab %q %w", tabID, errRemoteTabStatusSuperseded) |
| 181 | } |
| 182 | a.refreshRemoteModelOwnership(ctx, tabID, client, gen) |
| 183 | } |
| 184 | return status, err |
| 185 | } |
| 186 | |
| 187 | // remoteTabStatusURL selects the status endpoint for a tab. A spectator |
| 188 | // pinned to a taken-over session asks for that session's mirrored view; the |
| 189 | // serve's foreground belongs to whatever else it runs. |
| 190 | func (a *App) remoteTabStatusURL(tabID string) string { |
| 191 | path := "/status?runtime=1" |
| 192 | a.remoteTabMu.Lock() |
| 193 | tab := a.remoteTabs[tabID] |
| 194 | if tab != nil && tab.session.takenOver && strings.TrimSpace(tab.routing.currentPath) != "" { |
| 195 | path += "&session=" + url.QueryEscape(tab.routing.currentPath) |
| 196 | } |
| 197 | a.remoteTabMu.Unlock() |
| 198 | return path |
| 199 | } |
| 200 | |
| 201 | func (a *App) remoteTabClientGeneration(tabID string, client *http.Client) uint64 { |
| 202 | a.remoteTabMu.Lock() |
| 203 | defer a.remoteTabMu.Unlock() |
| 204 | if tab := a.remoteTabs[tabID]; tab != nil && tab.client == client { |
| 205 | return tab.gen |
| 206 | } |
| 207 | return 0 |
| 208 | } |
| 209 | |
| 210 | func (a *App) reserveRemoteTabStatusSequence(tabID string, client *http.Client, gen uint64) uint64 { |
| 211 | if gen == 0 { |
| 212 | return 0 |
| 213 | } |
| 214 | a.remoteTabMu.Lock() |
| 215 | defer a.remoteTabMu.Unlock() |
| 216 | tab := a.remoteTabs[tabID] |
| 217 | if tab == nil || tab.client != client || tab.gen != gen { |
| 218 | return 0 |
| 219 | } |
| 220 | tab.runtime.revision++ |
| 221 | return tab.runtime.revision |
| 222 | } |
| 223 | |
| 224 | type remoteTabStatusPayload struct { |
| 225 | RuntimeState *event.RuntimeStateSnapshot `json:"runtimeState"` |
| 226 | SessionName string `json:"sessionName"` |
| 227 | SessionPath string `json:"sessionPath"` |
| 228 | SessionID string `json:"sessionId"` |
| 229 | Running *bool `json:"running"` |
| 230 | PendingPrompt *bool `json:"pendingPrompt"` |
| 231 | BackgroundJobs *int `json:"backgroundJobs"` |
| 232 | CancelRequested *bool `json:"cancelRequested"` |
| 233 | Cancellable *bool `json:"cancellable"` |
| 234 | // TakenOver reports Serve's single-writer handoff state: a local runtime |
| 235 | // on the serve host owns the session and this tab is read-only. |
| 236 | TakenOver *bool `json:"takenOver"` |
| 237 | } |
| 238 | |
| 239 | func (a *App) recordRemoteTabSessionStatus(tabID string, client *http.Client, gen, statusSeq uint64, status json.RawMessage) bool { |
| 240 | var payload remoteTabStatusPayload |
| 241 | if gen == 0 || statusSeq == 0 { |
| 242 | return false |
| 243 | } |
| 244 | decodeErr := json.Unmarshal(status, &payload) |
| 245 | a.remoteTabMu.Lock() |
| 246 | tab := a.remoteTabs[tabID] |
| 247 | a.remoteTabMu.Unlock() |
| 248 | if tab == nil { |
| 249 | return false |
| 250 | } |
| 251 | tab.routeEventMu.Lock() |
| 252 | defer tab.routeEventMu.Unlock() |
| 253 | a.remoteTabMu.Lock() |
| 254 | if a.remoteTabs[tabID] != tab || tab.client != client || tab.gen != gen || tab.runtime.revision != statusSeq { |
| 255 | a.remoteTabMu.Unlock() |
| 256 | return false |
| 257 | } |
| 258 | if decodeErr != nil { |
| 259 | markRemoteRuntimeUnknownLocked(tab, tab.routing.currentPath) |
| 260 | a.remoteTabMu.Unlock() |
| 261 | a.emitRuntimeStateChanged() |
| 262 | a.goRemoteTabSafe("remoteRuntimeSync", func() { _, _ = a.SyncRuntimeState() }) |
| 263 | return false |
| 264 | } |
| 265 | payloadRoute := remoteSessionIdentityRoute(payload.SessionPath, payload.SessionID) |
| 266 | if remoteTabStatusRouteRejectedLocked(tab, payloadRoute) { |
| 267 | a.remoteTabMu.Unlock() |
| 268 | return false |
| 269 | } |
| 270 | // A payload reserved before an explicit reclaim can still be in flight with |
| 271 | // the pre-reclaim ownership; drop only its takenOver=true so its remaining |
| 272 | // runtime facts stay usable without re-pinning the spectator banner. |
| 273 | if statusSeq < tab.ownership.reclaimRevision && payload.TakenOver != nil && *payload.TakenOver { |
| 274 | payload.TakenOver = nil |
| 275 | } |
| 276 | before := remoteTabMetaLocked(tab) |
| 277 | pathChanged := adoptRemoteTabSessionPathLocked(tab, payloadRoute) |
| 278 | if pathChanged { |
| 279 | tab.topicTitle = remoteWorkspaceName(tab.ref.Workspace) |
| 280 | } |
| 281 | applyRemoteTabStatusPayload(tab, payload) |
| 282 | after := remoteTabMetaLocked(tab) |
| 283 | readyBarrier, deferredBarrier := resolveRemoteTabOwnershipBarrierLocked(tab, before, after, |
| 284 | remoteTabReadyBarrier(tab, pathChanged)) |
| 285 | a.remoteTabMu.Unlock() |
| 286 | if remoteTabStatusMetaChanged(before, after) { |
| 287 | a.emitRemoteEvent("remote-tab:updated", after) |
| 288 | } |
| 289 | if readyBarrier || deferredBarrier { |
| 290 | a.emitRemoteEvent(fmt.Sprintf("remote-tab:%s:state", tabID), RemoteTabStateView{State: "ready"}) |
| 291 | } |
| 292 | if pathChanged { |
| 293 | a.goRemoteTabSafe("remoteTabStatusTitle", func() { a.refreshRemoteTabTitle(tabID) }) |
| 294 | } |
| 295 | a.emitRuntimeStateChanged() |
| 296 | return true |
| 297 | } |
| 298 | |
| 299 | // remoteTabStatusRouteRejectedLocked reports whether a /status payload names a |
| 300 | // session this tab must not follow. |
| 301 | // |
| 302 | // Serve still reports the outgoing foreground until an in-flight /resume |
| 303 | // commits: that status is older than the provisional route and must not roll |
| 304 | // it back, and the target's SSE frames are already buffering behind its ready |
| 305 | // barrier. A spectator watches the session it explicitly selected, so the |
| 306 | // foreground status of any other session must not re-route its tab. |
| 307 | func remoteTabStatusRouteRejectedLocked(tab *remoteTab, payloadRoute string) bool { |
| 308 | if pendingPath := tab.routing.rehydratingPath; pendingPath != "" && payloadRoute != "" && payloadRoute != pendingPath { |
| 309 | return true |
| 310 | } |
| 311 | return payloadRoute != "" && payloadRoute != tab.routing.currentPath && tab.session.takenOver |
| 312 | } |
| 313 | |
| 314 | // resolveRemoteTabOwnershipBarrierLocked decides whether this status refresh |
| 315 | // publishes the re-hydration barrier, given the barrier a route change already |
| 316 | // requires. |
| 317 | // |
| 318 | // Ownership also returns through polling — an auto-reclaim once the local |
| 319 | // writer exits — rather than an explicit /reclaim. The surface is then still |
| 320 | // on the spectator-era projection and needs the barrier that re-hydrates it. |
| 321 | // Defer while a turn runs so the barrier never orphans an in-flight |
| 322 | // submission; a deferred barrier fires as soon as polling observes the surface |
| 323 | // idle. |
| 324 | func resolveRemoteTabOwnershipBarrierLocked(tab *remoteTab, before, after TabMeta, readyBarrier bool) (bool, bool) { |
| 325 | if before.TakenOver && !after.TakenOver { |
| 326 | if tab.runtime.running || tab.runtime.pendingPrompt { |
| 327 | tab.ownership.readyBarrierPending = true |
| 328 | } else { |
| 329 | readyBarrier = true |
| 330 | } |
| 331 | } |
| 332 | deferredBarrier := tab.ownership.readyBarrierPending && !tab.runtime.running && !tab.runtime.pendingPrompt |
| 333 | if deferredBarrier { |
| 334 | tab.ownership.readyBarrierPending = false |
| 335 | } |
| 336 | return readyBarrier, deferredBarrier |
| 337 | } |
| 338 | |
| 339 | // remoteTabStatusMetaChanged reports whether a status refresh moved a field the |
| 340 | // tab strip renders, keeping remote-tab:updated off unchanged refreshes. |
| 341 | func remoteTabStatusMetaChanged(before, after TabMeta) bool { |
| 342 | return before.SessionPath != after.SessionPath || before.TopicID != after.TopicID || |
| 343 | before.Running != after.Running || before.TurnStartedAt != after.TurnStartedAt || |
| 344 | before.PendingPrompt != after.PendingPrompt || before.BackgroundJobs != after.BackgroundJobs || |
| 345 | before.CancelRequested != after.CancelRequested || before.Cancellable != after.Cancellable || |
| 346 | before.TakenOver != after.TakenOver |
| 347 | } |
| 348 | |
| 349 | func applyRemoteTabStatusPayload(tab *remoteTab, payload remoteTabStatusPayload) { |
| 350 | payloadRoute := remoteSessionIdentityRoute(payload.SessionPath, payload.SessionID) |
| 351 | if payload.RuntimeState != nil && validRuntimeState(*payload.RuntimeState) { |
| 352 | acceptRemoteRuntimeStateLocked(tab, payloadRoute, *payload.RuntimeState, true) |
| 353 | payload.Running, payload.PendingPrompt, payload.BackgroundJobs, payload.CancelRequested, payload.Cancellable = nil, nil, nil, nil, nil |
| 354 | } else if payload.RuntimeState == nil && payload.Running != nil { |
| 355 | // An actual legacy status confirms only its selected session. Never |
| 356 | // leave a previous schema-1 observation shadowing these legacy facts. |
| 357 | delete(tab.runtimeStates, tab.routing.currentPath) |
| 358 | delete(tab.runtimeUnknown, tab.routing.currentPath) |
| 359 | tab.runtime.snapshot = event.RuntimeStateSnapshot{} |
| 360 | tab.runtime.syncFailed = false |
| 361 | } |
| 362 | if name := strings.TrimSpace(payload.SessionName); name != "" { |
| 363 | tab.session.name = name |
| 364 | tab.session.newSession = false |
| 365 | tab.session.reset = false |
| 366 | } |
| 367 | if payload.Running != nil { |
| 368 | tab.runtime.running = *payload.Running |
| 369 | if tab.routing.currentPath != "" { |
| 370 | if tab.routing.running == nil { |
| 371 | tab.routing.running = map[string]bool{} |
| 372 | } |
| 373 | tab.routing.revision++ |
| 374 | tab.routing.running[tab.routing.currentPath] = *payload.Running |
| 375 | } |
| 376 | } |
| 377 | if payload.TakenOver != nil { |
| 378 | tab.session.takenOver = *payload.TakenOver |
| 379 | } |
| 380 | if payload.PendingPrompt != nil { |
| 381 | tab.runtime.pendingPrompt = *payload.PendingPrompt |
| 382 | } |
| 383 | if payload.BackgroundJobs != nil { |
| 384 | tab.runtime.backgroundJobs = max(0, *payload.BackgroundJobs) |
| 385 | } |
| 386 | if payload.CancelRequested != nil { |
| 387 | tab.runtime.cancelRequested = *payload.CancelRequested |
| 388 | } |
| 389 | if payload.Cancellable != nil { |
| 390 | tab.runtime.cancellable = *payload.Cancellable |
| 391 | } |
| 392 | if (tab.runtime.running || tab.runtime.pendingPrompt) && tab.runtime.turnStartedAt <= 0 { |
| 393 | tab.runtime.turnStartedAt = time.Now().UnixMilli() |
| 394 | } else if !tab.runtime.running && !tab.runtime.pendingPrompt { |
| 395 | tab.runtime.turnStartedAt = 0 |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | func remoteTabReadyBarrier(tab *remoteTab, pathChanged bool) bool { |
| 400 | return pathChanged && tab != nil && tab.state == "ready" |
| 401 | } |
| 402 | |
| 403 | func (a *App) recordRemoteTabModelCatalog(tabID string, client *http.Client, gen uint64, models json.RawMessage) { |
| 404 | if gen == 0 || a.remoteTabLocalProxy(tabID) { |
| 405 | return |
| 406 | } |
| 407 | var payload struct { |
| 408 | Current string `json:"current"` |
| 409 | Models []struct { |
| 410 | Ref string `json:"ref"` |
| 411 | Active bool `json:"active"` |
| 412 | } `json:"models"` |
| 413 | } |
| 414 | if json.Unmarshal(models, &payload) != nil { |
| 415 | return |
| 416 | } |
| 417 | current := strings.TrimSpace(payload.Current) |
| 418 | if current == "" { |
| 419 | for _, entry := range payload.Models { |
| 420 | if entry.Active { |
| 421 | current = strings.TrimSpace(entry.Ref) |
| 422 | break |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | if current == "" { |
| 427 | return |
| 428 | } |
| 429 | a.remoteTabMu.Lock() |
| 430 | tab := a.remoteTabs[tabID] |
| 431 | if tab == nil || tab.client != client || tab.gen != gen || tab.model == current { |
| 432 | a.remoteTabMu.Unlock() |
| 433 | return |
| 434 | } |
| 435 | tab.model = current |
| 436 | tab.modelSeq = remoteTabModelSeq.Add(1) |
| 437 | meta := remoteTabMetaLocked(tab) |
| 438 | a.remoteTabMu.Unlock() |
| 439 | a.emitRemoteEvent("remote-tab:updated", meta) |
| 440 | a.saveTabsFromRemote() |
| 441 | } |
| 442 | |
| 443 | // listTabsWithRemote merges the remote strip entries into a local tab list. |
| 444 | // A highlighted remote tab deactivates every local entry so the strip shows |
| 445 | // exactly one active tab. |
| 446 | func (a *App) listTabsWithRemote(local []TabMeta) []TabMeta { |
| 447 | localIDs := make([]string, 0, len(local)) |
| 448 | for _, meta := range local { |
| 449 | localIDs = append(localIDs, meta.ID) |
| 450 | } |
| 451 | remote, remoteActive, stripOrder := a.remoteTabMetas(localIDs) |
| 452 | if remoteActive != "" { |
| 453 | for i := range local { |
| 454 | local[i].Active = false |
| 455 | } |
| 456 | } |
| 457 | if len(remote) == 0 { |
| 458 | return enrichTabMetas(local) |
| 459 | } |
| 460 | all := append(enrichTabMetas(local), remote...) |
| 461 | byID := make(map[string]TabMeta, len(all)) |
| 462 | for _, meta := range all { |
| 463 | byID[meta.ID] = meta |
| 464 | } |
| 465 | out := make([]TabMeta, 0, len(all)) |
| 466 | for _, id := range stripOrder { |
| 467 | if meta, ok := byID[id]; ok { |
| 468 | out = append(out, meta) |
| 469 | } |
| 470 | } |
| 471 | return out |
| 472 | } |
| 473 |