| 1 | import Foundation |
| 2 | import Observation |
| 3 | import RastrilloApple |
| 4 | import RastrilloNative |
| 5 | |
| 6 | @MainActor @Observable final class DocsModel { |
| 7 | enum ListState { case loading, loaded, failed } |
| 8 | var listState = ListState.loading |
| 9 | private var listRequest = UUID() |
| 10 | var documents: [DocumentSummary] = [] |
| 11 | var canCreate = false |
| 12 | var errorKey: String? |
| 13 | var detail: DocumentDetail? |
| 14 | var projection: CRDTProjection? |
| 15 | var projectionGeneration: UInt64 = 0 |
| 16 | var renderedGeneration: UInt64 = 0 |
| 17 | var composing = false |
| 18 | var inputPaused = false |
| 19 | var explicitCommandRevision: UInt64 = 0 |
| 20 | var loading = false |
| 21 | var creatingDocument = false |
| 22 | private var lifetime = UUID() |
| 23 | private(set) var draftToken: String? |
| 24 | private var creationTask: Task<Void, Never>? |
| 25 | private var pendingTitle: String? |
| 26 | private var metadataDirty = false |
| 27 | var renameInput: String? |
| 28 | private var titleRevision: UInt64 = 0 |
| 29 | var isDraft: Bool { draftToken != nil } |
| 30 | var editorIdentity = UUID() |
| 31 | |
| 32 | var selection = NSRange(location: 0, length: 0) |
| 33 | var typingMarks: [String: JSONValue]? |
| 34 | private var replica: CRDTReplica? |
| 35 | private var sequence: Int64 = 0 |
| 36 | let offlineAccount: DocsOfflineAccount |
| 37 | private var persistence: DocsPersistence? |
| 38 | private var documentKey: String? |
| 39 | private var failedUpdate: Data? |
| 40 | private var localFailure: SyncFailure? |
| 41 | private var writerTask: Task<Void, Never>? |
| 42 | private let writer = CoalescedRunner() |
| 43 | private var laneSummary = OutboxSummary() |
| 44 | private var summaryTask: Task<Void, Never>? |
| 45 | var syncStatus: SyncStatus { offlineAccount.drainer.status(lane: documentKey.map { "doc:" + $0 }, localFailure: localFailure) } |
| 46 | var lostChangesNotice: String? { outboxSummary.lostUnsent ? NativeSyncStrings.kit.unsentLost : nil } |
| 47 | func dismissLostChangesNotice() async { await offlineAccount.outbox.acknowledgeLoss() } |
| 48 | var outboxSummary: OutboxSummary { offlineAccount.drainer.summary } |
| 49 | |
| 50 | private var editing: [[String: JSONValue]] = [] |
| 51 | private var editingTask: Task<Void, Never>? |
| 52 | private var streamTask: Task<Void, Never>? |
| 53 | private var saving = false |
| 54 | private var documentEpoch = UUID() |
| 55 | private let publications = DocumentPublication() |
| 56 | /// Resolved on every request, never captured: this model can hold unsent |
| 57 | /// edits for longer than one session, and signing in again replaces the |
| 58 | /// transport under it. A captured client would keep sending with the ended |
| 59 | /// session. nil means no session; requests then fail as `.unauthorized`. |
| 60 | private let transport: @MainActor () -> NativeTransport? |
| 61 | /// The stream loop waits on this between attempts, so a restored network |
| 62 | /// reconnects at once and an offline device makes no timed attempts. |
| 63 | let connectivity: NativeConnectivity |
| 64 | /// Monotonic seconds for the stream loop's pacing; tests substitute a fake. |
| 65 | var reconnectClock: @MainActor () -> TimeInterval = { ProcessInfo.processInfo.systemUptime } |
| 66 | init(transport: @escaping @MainActor () -> NativeTransport?, connectivity: NativeConnectivity? = nil, draft: Bool = false, offlineAccount: DocsOfflineAccount? = nil) { |
| 67 | self.transport = transport |
| 68 | self.connectivity = connectivity ?? .shared |
| 69 | self.offlineAccount = offlineAccount ?? DocsOfflineAccount(store: EphemeralDocsStore(), accountID: UUID().uuidString, connectivity: connectivity ?? .shared, transport: transport) |
| 70 | if draft { draftToken = UUID().uuidString } |
| 71 | } |
| 72 | convenience init(client: NativeTransport, connectivity: NativeConnectivity? = nil, draft: Bool = false) { |
| 73 | self.init(transport: { client }, connectivity: connectivity, draft: draft) |
| 74 | } |
| 75 | private func client() throws -> NativeTransport { |
| 76 | guard let current = transport() else { throw NativeClientError.unauthorized } |
| 77 | return current |
| 78 | } |
| 79 | var hasPendingInput: Bool { !editing.isEmpty || editingTask != nil } |
| 80 | var hasUnpersistedInput: Bool { metadataDirty || (renameInput != nil && renameInput != detail?.title) || composing || !editing.isEmpty || editingTask != nil || failedUpdate != nil || localFailure == .cannotSaveOnDevice } |
| 81 | var hasUnsentChanges: Bool { !laneSummary.isEmpty || pendingTitle != nil || isDraft } |
| 82 | // K6 relaxes the close guard; K3 exposes the split without bypassing it. |
| 83 | var hasUnsavedChanges: Bool { hasUnpersistedInput || hasUnsentChanges } |
| 84 | private func configurePersistence(key: String, replica: CRDTReplica) { |
| 85 | documentKey = key |
| 86 | persistence = DocsPersistence(store: offlineAccount.store, outbox: offlineAccount.outbox, key: key, replica: replica, cache: offlineAccount.replicaCache) |
| 87 | summaryTask?.cancel() |
| 88 | summaryTask = Task { [weak self, outbox = offlineAccount.outbox] in |
| 89 | for await summary in await outbox.changes { |
| 90 | guard let self, self.documentKey == key else { return } |
| 91 | self.updateLaneSummary(summary.only("doc:" + key)) |
| 92 | self.reloadMetadata() |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | private func updateLaneSummary(_ summary: OutboxSummary) { |
| 97 | laneSummary = summary |
| 98 | let tooLarge = summary.lanes.values.contains { $0.bytes > 32 * 1024 * 1024 } |
| 99 | if tooLarge, localFailure == nil || localFailure == .tooManyUnsent { |
| 100 | localFailure = .tooManyUnsent; inputPaused = true |
| 101 | } else if !tooLarge, localFailure == .tooManyUnsent { |
| 102 | localFailure = nil; inputPaused = detail?.can_write != true || summary.held > 0 |
| 103 | } |
| 104 | } |
| 105 | private func reloadMetadata() { |
| 106 | guard !metadataDirty, let key = documentKey, let stored = try? offlineAccount.metadata(key) else { return } |
| 107 | let attached = draftToken != nil && stored.draftToken == nil |
| 108 | detail = stored.detail; pendingTitle = stored.pendingTitle; draftToken = stored.draftToken |
| 109 | if attached, streamTask == nil { |
| 110 | streamTask = Task { [weak self] in await self?.listen(stored.detail.sqid) } |
| 111 | } |
| 112 | } |
| 113 | private func saveMetadata() throws { |
| 114 | guard let documentKey, let detail else { return } |
| 115 | metadataDirty = true |
| 116 | try offlineAccount.saveMetadata(DocsOfflineMetadata(detail: detail, pendingTitle: pendingTitle, draftToken: draftToken), key: documentKey) |
| 117 | metadataDirty = false |
| 118 | } |
| 119 | private func schedulePersistence() { |
| 120 | writerTask?.cancel() |
| 121 | writerTask = Task { [weak self] in |
| 122 | do { try await Task.sleep(for: .seconds(2)) } catch { return } |
| 123 | await self?.persistReplica() |
| 124 | } |
| 125 | } |
| 126 | func persistReplica() async { |
| 127 | await writer.run { [weak self] in |
| 128 | guard let self, let persistence = self.persistence else { return } |
| 129 | do { |
| 130 | if try await !persistence.persist() { self.schedulePersistence() } |
| 131 | else if self.localFailure == .cannotSaveOnDevice, self.failedUpdate == nil, !self.metadataDirty { |
| 132 | self.localFailure = nil |
| 133 | if self.detail?.can_write == true { self.inputPaused = false } |
| 134 | } |
| 135 | } catch { self.localFailure = .cannotSaveOnDevice; self.inputPaused = true } |
| 136 | } |
| 137 | } |
| 138 | private func durable(_ update: Data) async throws { |
| 139 | guard let persistence else { throw BlobStoreError.unavailable } |
| 140 | failedUpdate = update |
| 141 | try await persistence.enqueue(update) |
| 142 | failedUpdate = nil |
| 143 | updateLaneSummary(await offlineAccount.outbox.summary.only(persistence.lane)) |
| 144 | try await persistence.compact() |
| 145 | } |
| 146 | func load(query: String = "") async { |
| 147 | do { try await offlineAccount.activate() } catch { localFailure = .cannotSaveOnDevice } |
| 148 | let request = UUID(); listRequest = request |
| 149 | listState = .loading |
| 150 | do { |
| 151 | var components = URLComponents(); components.queryItems = [URLQueryItem(name: "q", value: query)] |
| 152 | let q = (components.percentEncodedQuery ?? "").replacingOccurrences(of: "+", with: "%2B") |
| 153 | let response: DocumentList = try await client().request("/?\(q)") |
| 154 | guard listRequest == request, !Task.isCancelled else { return } |
| 155 | documents = response.documents; canCreate = response.can_create |
| 156 | listState = .loaded; errorKey = nil |
| 157 | } catch { |
| 158 | guard listRequest == request else { return } |
| 159 | listState = .failed; errorKey = "docs.error.generic" |
| 160 | } |
| 161 | } |
| 162 | /// The editor and its initial paragraph are local. Server acknowledgement |
| 163 | /// only attaches an identity; it never reconstructs the editor or selection. |
| 164 | func newDraft() async { |
| 165 | guard detail == nil, replica == nil else { return } |
| 166 | if draftToken == nil { draftToken = UUID().uuidString } |
| 167 | let epoch = documentEpoch |
| 168 | let guid = UUID().uuidString |
| 169 | let local = CRDTReplica(guid: guid) |
| 170 | loading = true |
| 171 | defer { if documentEpoch == epoch { loading = false } } |
| 172 | do { |
| 173 | try await offlineAccount.outbox.load() |
| 174 | _ = try await local.open(update: Data()) |
| 175 | let (update, _) = try await local.command(["op": .string("insert_element"), "at": .number(0), "type": .string("paragraph")]) |
| 176 | guard documentEpoch == epoch else { await local.close(); return } |
| 177 | replica = local |
| 178 | configurePersistence(key: "draft-" + draftToken!, replica: local) |
| 179 | detail = DocumentDetail(sqid: "draft-" + draftToken!, title: String(localized: "docs.document.untitled", bundle: DocsResources.bundle), guid: guid, can_write: true, can_share: false) |
| 180 | failedUpdate = update |
| 181 | try saveMetadata() |
| 182 | try await durable(update) |
| 183 | await publish() |
| 184 | guard documentEpoch == epoch else { return } |
| 185 | offlineAccount.drainer.start() |
| 186 | startCreation() |
| 187 | } catch { if documentEpoch == epoch { errorKey = "native.pending"; localFailure = .cannotSaveOnDevice; inputPaused = true } } |
| 188 | } |
| 189 | private func startCreation() { |
| 190 | guard creationTask == nil, draftToken != nil else { return } |
| 191 | creatingDocument = true |
| 192 | let epoch = documentEpoch |
| 193 | creationTask = Task { |
| 194 | await attachDraft(epoch: epoch) |
| 195 | if documentEpoch == epoch { creationTask = nil; creatingDocument = false } |
| 196 | } |
| 197 | } |
| 198 | private func attachDraft(epoch: UUID) async { |
| 199 | guard let key = documentKey else { return } |
| 200 | do { |
| 201 | try await offlineAccount.ensureMetadataEntry(key) |
| 202 | await offlineAccount.drainer.drain() |
| 203 | guard documentEpoch == epoch else { return } |
| 204 | reloadMetadata() |
| 205 | if isDraft { errorKey = "native.pending" } |
| 206 | else { await persistReplica(); await flush() } |
| 207 | } catch { if documentEpoch == epoch { errorKey = "native.pending" } } |
| 208 | } |
| 209 | @discardableResult func commitRename() -> Bool { |
| 210 | guard let value = renameInput else { return true } |
| 211 | guard rename(value) else { return false } |
| 212 | renameInput = nil |
| 213 | return true |
| 214 | } |
| 215 | @discardableResult func rename(_ value: String) -> Bool { |
| 216 | guard let detail, detail.can_write else { return false } |
| 217 | let trimmed = value.trimmingCharacters(in: .whitespacesAndNewlines) |
| 218 | let title = trimmed.isEmpty ? String(localized: "docs.document.untitled", bundle: DocsResources.bundle) : trimmed |
| 219 | guard title.utf8.count <= 1024 else { errorKey = "docs.error.generic"; return false } |
| 220 | if title == detail.title { |
| 221 | guard metadataDirty else { return true } |
| 222 | do { try saveMetadata() } catch { localFailure = .cannotSaveOnDevice; inputPaused = true; return false } |
| 223 | } |
| 224 | self.detail = DocumentDetail(sqid: detail.sqid, title: title, guid: detail.guid, can_write: detail.can_write, can_share: detail.can_share) |
| 225 | pendingTitle = title; titleRevision &+= 1 |
| 226 | do { try saveMetadata() } catch { localFailure = .cannotSaveOnDevice; inputPaused = true; return false } |
| 227 | Task { |
| 228 | do { if let documentKey { try await offlineAccount.ensureMetadataEntry(documentKey) } } |
| 229 | catch { localFailure = .cannotSaveOnDevice; inputPaused = true } |
| 230 | await flush() |
| 231 | } |
| 232 | return true |
| 233 | } |
| 234 | func open(_ sqid: String) async { |
| 235 | guard !hasUnsavedChanges else { errorKey = "native.pending"; return } |
| 236 | let epoch = UUID(); documentEpoch = epoch; editorIdentity = UUID() |
| 237 | streamTask?.cancel(); streamTask = nil |
| 238 | let previous = replica; replica = nil; detail = nil; projection = nil |
| 239 | loading = true; errorKey = nil |
| 240 | if let previous { await previous.close() } |
| 241 | guard documentEpoch == epoch else { return } |
| 242 | defer { if documentEpoch == epoch { loading = false } } |
| 243 | do { |
| 244 | try await offlineAccount.outbox.load() |
| 245 | let key = try offlineAccount.key(for: sqid) |
| 246 | let cached = try offlineAccount.metadata(key) |
| 247 | pendingTitle = cached?.pendingTitle; draftToken = cached?.draftToken |
| 248 | let detail: DocumentDetail |
| 249 | let initial: Data |
| 250 | let seq: Int64 |
| 251 | if let cached, try offlineAccount.store.read("cache/docs/\(key)/replica") != nil { |
| 252 | detail = cached.detail; pendingTitle = cached.pendingTitle; initial = Data(); seq = 0 |
| 253 | } else { |
| 254 | let remote: DocumentDetail = try await client().request("/d/\(sqid)") |
| 255 | detail = DocumentDetail(sqid: remote.sqid, title: cached?.pendingTitle ?? remote.title, guid: remote.guid, can_write: remote.can_write, can_share: remote.can_share) |
| 256 | let reply = try await client().responseDetails("/d/\(sqid)/updates", maxBytes: 8 * 1024 * 1024) |
| 257 | try reply.requireSuccess() |
| 258 | guard let cursor = Int64(reply.header("Docs-Seq") ?? "") else { throw CRDTReplica.Failure.rejected } |
| 259 | initial = reply.data; seq = cursor |
| 260 | } |
| 261 | guard documentEpoch == epoch else { return } |
| 262 | let replica = CRDTReplica(guid: detail.guid) |
| 263 | configurePersistence(key: key, replica: replica) |
| 264 | try await persistence!.reopen(fallback: initial, sequence: seq) |
| 265 | let projection = try await replica.projection() |
| 266 | guard documentEpoch == epoch else { await replica.close(); return } |
| 267 | self.replica = replica; self.detail = detail |
| 268 | reloadMetadata() |
| 269 | sequence = try await replica.persistentState().sequence |
| 270 | laneSummary = await offlineAccount.outbox.summary.only("doc:" + key) |
| 271 | if cached == nil { try saveMetadata() } |
| 272 | try await offlineAccount.ensureMetadataEntry(key) |
| 273 | projectionGeneration = 0; renderedGeneration = 0 |
| 274 | selection = NSRange(location: 0, length: 0); typingMarks = nil |
| 275 | composing = false; inputPaused = false |
| 276 | updateLaneSummary(laneSummary) |
| 277 | await publish() |
| 278 | guard documentEpoch == epoch else { return } |
| 279 | if projection.children.isEmpty && detail.can_write { |
| 280 | enqueue(["op":.string("insert_element"), "at":.number(0), "type":.string("paragraph")]) |
| 281 | } |
| 282 | await persistReplica() |
| 283 | offlineAccount.drainer.start() |
| 284 | streamTask = Task { [weak self] in await self?.listen(sqid) } |
| 285 | } catch { if documentEpoch == epoch { errorKey = "docs.error.generic"; detail = nil; projection = nil } } |
| 286 | } |
| 287 | @discardableResult func enqueue(_ command: [String: JSONValue]) -> Bool { |
| 288 | guard !inputPaused, detail?.can_write == true else { return false } |
| 289 | let buffered = editing.reduce(0) { $0 + ((try? JSONEncoder().encode($1).count) ?? 0) } |
| 290 | guard let incoming = try? JSONEncoder().encode(command).count, incoming <= 2 * 1024 * 1024 - buffered else { errorKey = "native.pending"; return false } |
| 291 | var command = command |
| 292 | if case .number(let generation) = command["generation"], let value = UInt64(exactly: generation) { didRender(value) } |
| 293 | if command["generation"] == nil, renderedGeneration != 0 { command["generation"] = .number(Double(renderedGeneration)) } |
| 294 | if [JSONValue.string("replace_text"), .string("display_edit")].contains(command["op"] ?? .null), let typingMarks { command["marks"] = .object(typingMarks) } |
| 295 | if ![JSONValue.string("display_edit"), .string("display_autoformat"), .string("display_revert_rule"), .string("display_exit_list"), .string("insert_element")].contains(command["op"] ?? .null) { explicitCommandRevision &+= 1 } |
| 296 | editing.append(command) |
| 297 | if editingTask == nil { editingTask = Task { await drainEdits() } } |
| 298 | return true |
| 299 | } |
| 300 | private func drainEdits() async { |
| 301 | let epoch = documentEpoch |
| 302 | defer { if documentEpoch == epoch { editingTask = nil } } |
| 303 | while documentEpoch == epoch, !editing.isEmpty, let replica { |
| 304 | let command = editing.removeFirst() |
| 305 | do { |
| 306 | let (update, _) = try await replica.command(command) |
| 307 | guard documentEpoch == epoch else { return } |
| 308 | do { try await durable(update) } |
| 309 | catch { localFailure = .cannotSaveOnDevice; inputPaused = true; break } |
| 310 | if editing.isEmpty { await publish() } |
| 311 | } catch { |
| 312 | guard documentEpoch == epoch else { return } |
| 313 | errorKey = "native.recovered"; editing.insert(command, at: 0); inputPaused = true; break |
| 314 | } |
| 315 | } |
| 316 | Task { await flush() } |
| 317 | } |
| 318 | func compositionChanged(_ active: Bool) { |
| 319 | composing = active |
| 320 | if !active && editingTask == nil { Task { await publish() } } |
| 321 | } |
| 322 | func canRender(_ generation: UInt64) -> Bool { !hasPendingInput && !composing && generation == projectionGeneration } |
| 323 | func currentSelection() -> NSRange { selection } |
| 324 | func selectionMovedExplicitly() { typingMarks = nil } |
| 325 | func didRender(_ generation: UInt64) { |
| 326 | // A delayed acknowledgement cannot retire the currently displayed source. |
| 327 | guard generation > renderedGeneration else { return } |
| 328 | renderedGeneration = generation |
| 329 | } |
| 330 | private func publish() async { await publications.run { await self.publishCurrent() } } |
| 331 | private func publishCurrent() async { |
| 332 | let epoch = documentEpoch |
| 333 | guard !composing, editing.isEmpty, let replica else { return } |
| 334 | await replica.retainGenerations(Set([renderedGeneration, projectionGeneration])) |
| 335 | guard documentEpoch == epoch, editing.isEmpty else { return } |
| 336 | do { |
| 337 | let source = renderedGeneration; let selected = selection |
| 338 | if let (generation, projected, resolved) = try await replica.presentation(source: source, selection: selected, allowReuse: source == projectionGeneration), editing.isEmpty, source == renderedGeneration, selected == selection, !composing, documentEpoch == epoch, generation >= projectionGeneration { |
| 339 | selection = resolved; projectionGeneration = generation; projection = projected |
| 340 | schedulePersistence() |
| 341 | } |
| 342 | } catch { if documentEpoch == epoch { errorKey = "native.recovered" } } |
| 343 | } |
| 344 | func retry() async { |
| 345 | let epoch = documentEpoch |
| 346 | if localFailure == .cannotSaveOnDevice || failedUpdate != nil { |
| 347 | do { |
| 348 | try await offlineAccount.outbox.load() |
| 349 | if metadataDirty { try saveMetadata() } |
| 350 | if let failedUpdate { try await durable(failedUpdate) } |
| 351 | guard documentEpoch == epoch else { return } |
| 352 | localFailure = nil; inputPaused = false |
| 353 | await persistReplica() |
| 354 | guard localFailure == nil else { return } |
| 355 | await publish() |
| 356 | } catch { return } |
| 357 | } |
| 358 | if let persistence { updateLaneSummary(await offlineAccount.outbox.summary.only(persistence.lane)) } |
| 359 | if localFailure == .tooManyUnsent { return } |
| 360 | offlineAccount.drainer.start() |
| 361 | if editingTask == nil, !editing.isEmpty, !inputPaused { |
| 362 | editingTask = Task { await drainEdits() } |
| 363 | } |
| 364 | if isDraft { |
| 365 | if replica == nil { await newDraft() } else { startCreation() } |
| 366 | await creationTask?.value |
| 367 | return |
| 368 | } |
| 369 | if transport() != nil { offlineAccount.drainer.sessionRestored() } |
| 370 | offlineAccount.drainer.retryNow() |
| 371 | if inputPaused { |
| 372 | if let detail { await refreshAccess(detail.sqid, epoch: epoch) } |
| 373 | guard documentEpoch == epoch, detail?.can_write == true else { return } |
| 374 | inputPaused = false; errorKey = nil |
| 375 | if editingTask == nil { editingTask = Task { await drainEdits() } } |
| 376 | } else { await flush() } |
| 377 | } |
| 378 | func stop() async { |
| 379 | lifetime = UUID() |
| 380 | await persistReplica() |
| 381 | guard !hasUnsavedChanges else { return } |
| 382 | documentEpoch = UUID(); streamTask?.cancel(); streamTask = nil |
| 383 | writerTask?.cancel(); summaryTask?.cancel() |
| 384 | let previous = replica; replica = nil; detail = nil; projection = nil |
| 385 | if let previous { await previous.close() } |
| 386 | } |
| 387 | /// Discard only unsent local draft state. An already acknowledged network |
| 388 | /// update remains part of the shared document, as in the web editor. |
| 389 | func discardAll() async { |
| 390 | documentEpoch = UUID() |
| 391 | writerTask?.cancel(); editingTask?.cancel(); streamTask?.cancel() |
| 392 | do { |
| 393 | try await persistence?.discard() |
| 394 | if let documentKey { try offlineAccount.store.remove("cache/docs/\(documentKey)/meta") } |
| 395 | } catch { localFailure = .cannotSaveOnDevice; return } |
| 396 | writerTask?.cancel(); summaryTask?.cancel(); persistence = nil; documentKey = nil |
| 397 | laneSummary = OutboxSummary(); failedUpdate = nil; localFailure = nil |
| 398 | documentEpoch = UUID() |
| 399 | creationTask?.cancel(); creationTask = nil; creatingDocument = false |
| 400 | draftToken = nil; pendingTitle = nil; metadataDirty = false; renameInput = nil |
| 401 | streamTask?.cancel(); streamTask = nil |
| 402 | editingTask?.cancel(); editingTask = nil |
| 403 | editing.removeAll(); saving = false |
| 404 | composing = false; inputPaused = false; typingMarks = nil |
| 405 | selection = NSRange(location: 0, length: 0) |
| 406 | let previous = replica; replica = nil; detail = nil; projection = nil |
| 407 | projectionGeneration = 0; renderedGeneration = 0; errorKey = nil |
| 408 | if let previous { await previous.close() } |
| 409 | } |
| 410 | func saveAll() async -> Bool { |
| 411 | guard commitRename() else { return false } |
| 412 | if isDraft { startCreation(); await creationTask?.value } |
| 413 | if let editingTask { await editingTask.value } |
| 414 | while saving { try? await Task.sleep(for: .milliseconds(20)) } |
| 415 | await flush() |
| 416 | await persistReplica() |
| 417 | return !hasUnsavedChanges |
| 418 | } |
| 419 | func flush() async { |
| 420 | guard !saving, detail != nil, let persistence else { return }; saving = true |
| 421 | let epoch = documentEpoch |
| 422 | defer { if documentEpoch == epoch { saving = false } } |
| 423 | do { try await offlineAccount.ensureMetadataEntry(persistence.key) } |
| 424 | catch { localFailure = .cannotSaveOnDevice; inputPaused = true; return } |
| 425 | await offlineAccount.drainer.drain() |
| 426 | guard documentEpoch == epoch else { return } |
| 427 | laneSummary = await offlineAccount.outbox.summary.only(persistence.lane) |
| 428 | reloadMetadata() |
| 429 | // SyncStatus presents a durable pending lane; it does not require |
| 430 | // keeping this document open. Preserve unrelated actionable errors. |
| 431 | if errorKey == "native.pending" || errorKey == "docs.editor.status.retrying" { errorKey = nil } |
| 432 | } |
| 433 | private func listen(_ sqid: String) async { |
| 434 | let epoch = documentEpoch |
| 435 | // Paces reconnects: a server's Retry-After is a deadline no wake |
| 436 | // crosses; otherwise back off, cut short by a connectivity change, |
| 437 | // with no timer while the path is down. The backoff resets only after |
| 438 | // a stream that stayed open for 5 s, timed from onOpen. |
| 439 | let reconnect = NativeReconnect(connectivity: connectivity, now: reconnectClock) |
| 440 | while !Task.isCancelled, documentEpoch == epoch, detail?.sqid == sqid { |
| 441 | await flush() |
| 442 | do { |
| 443 | try await client().stream("/d/\(sqid)/stream", onOpen: { await reconnect.opened() }) { [weak self] line in |
| 444 | if line.hasPrefix("data:"), let seq = Int64(line.dropFirst(5).trimmingCharacters(in: .whitespaces)) { |
| 445 | await self?.refresh(sqid, remoteSequence: seq) |
| 446 | } |
| 447 | } |
| 448 | } catch { |
| 449 | reconnect.failed(error) |
| 450 | if !Task.isCancelled, documentEpoch == epoch { |
| 451 | errorKey = "docs.editor.status.retrying" |
| 452 | await refreshAccess(sqid, epoch: epoch) |
| 453 | } |
| 454 | } |
| 455 | await reconnect.pause() |
| 456 | } |
| 457 | } |
| 458 | private func refresh(_ sqid: String, remoteSequence: Int64) async { |
| 459 | let epoch = documentEpoch |
| 460 | guard detail?.sqid == sqid, remoteSequence > sequence, let replica else { return } |
| 461 | do { |
| 462 | let reply = try await client().responseDetails("/d/\(sqid)/updates?since=\(sequence)", maxBytes: 8 * 1024 * 1024) |
| 463 | guard reply.status == 200, let seq = Int64(reply.header("Docs-Seq") ?? "") else { throw CRDTReplica.Failure.rejected } |
| 464 | guard self.detail?.sqid == sqid, self.replica === replica else { return } |
| 465 | _ = try await replica.apply(reply.data) |
| 466 | guard self.detail?.sqid == sqid, self.replica === replica else { return } |
| 467 | sequence = max(sequence, seq) |
| 468 | await replica.setSequence(sequence) |
| 469 | await persistReplica() |
| 470 | if editing.isEmpty && editingTask == nil { await publish() } |
| 471 | await flush() |
| 472 | } catch { if documentEpoch == epoch { errorKey = "docs.editor.status.retrying" } } |
| 473 | } |
| 474 | /// Revalidate capability after stream/write rejection while retaining the draft. |
| 475 | private func refreshAccess(_ sqid: String, epoch: UUID) async { |
| 476 | let revision = titleRevision |
| 477 | let hadPendingTitle = pendingTitle != nil |
| 478 | do { |
| 479 | let reply = try await client().responseDetails("/d/\(sqid)", maxBytes: 1024 * 1024) |
| 480 | guard documentEpoch == epoch else { return } |
| 481 | if reply.status == 200 { |
| 482 | let current = try JSONDecoder().decode(DocumentDetail.self, from: reply.data) |
| 483 | // The GET may have read its title before a rename acknowledged. |
| 484 | // Clearing pendingTitle must not let that old reply win afterward. |
| 485 | let title = pendingTitle ?? ((hadPendingTitle || titleRevision != revision) ? (detail?.title ?? current.title) : current.title) |
| 486 | detail = DocumentDetail(sqid: current.sqid, title: title, guid: current.guid, can_write: current.can_write, can_share: current.can_share) |
| 487 | if !current.can_write { inputPaused = true } |
| 488 | } else if [401, 403, 404].contains(reply.status) { |
| 489 | inputPaused = true |
| 490 | if let current = detail { |
| 491 | detail = DocumentDetail(sqid: current.sqid, title: current.title, guid: current.guid, can_write: false, can_share: false) |
| 492 | } |
| 493 | } |
| 494 | } catch { /* A connection failure cannot establish a capability change. */ } |
| 495 | } |
| 496 | |
| 497 | } |
| 498 | |
amadan