| 1 | import Foundation |
| 2 | import Observation |
| 3 | import RastrilloApple |
| 4 | import RastrilloNative |
| 5 | |
| 6 | struct DocsOfflineMetadata: Codable { |
| 7 | var detail: DocumentDetail |
| 8 | var pendingTitle: String? |
| 9 | var draftToken: String? |
| 10 | } |
| 11 | |
| 12 | /// All windows for an account share the same outbox and send reservation. |
| 13 | @MainActor @Observable final class DocsOfflineAccount { |
| 14 | private static var accounts: [String: DocsOfflineAccount] = [:] |
| 15 | let store: BlobStore |
| 16 | let outbox: Outbox |
| 17 | let connectivity: NativeConnectivity |
| 18 | let replicaCache: DocsReplicaCache |
| 19 | private var supplier: @MainActor () -> NativeTransport? |
| 20 | private(set) var drainer: OutboxDrainer! |
| 21 | static func account(_ id: String, origin: URL, fallback: NativeTransport, transport: (@MainActor () -> NativeTransport?)?) -> DocsOfflineAccount { |
| 22 | if let existing = accounts[id] { if let transport { existing.supplier = transport; existing.drainer.sessionRestored() }; return existing } |
| 23 | let root = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask)[0] |
| 24 | .appendingPathComponent(Bundle.main.bundleIdentifier ?? "works.oficina.docs") |
| 25 | .appendingPathComponent("accounts").appendingPathComponent(id) |
| 26 | let store = NativeSealedStore(root: root, accountID: id, keys: KeychainKeyProvider(accountID: id, origin: origin)) |
| 27 | let account = DocsOfflineAccount(store: store, accountID: id, connectivity: .shared, transport: transport ?? { fallback }) |
| 28 | accounts[id] = account; return account |
| 29 | } |
| 30 | init(store: BlobStore, accountID: String, connectivity: NativeConnectivity, transport: @escaping @MainActor () -> NativeTransport?) { |
| 31 | self.store = store; outbox = Outbox(store: store, account: accountID) |
| 32 | replicaCache = DocsReplicaCache(store: store) |
| 33 | self.connectivity = connectivity; supplier = transport |
| 34 | drainer = OutboxDrainer(outbox: outbox, transport: { [weak self] in self?.supplier() }, connectivity: connectivity, maxBatchBytes: 512 * 1024) { [weak self] lane, entries, transport in |
| 35 | guard let self else { throw CancellationError() } |
| 36 | return try await self.send(lane, entries: entries, transport: transport) |
| 37 | } |
| 38 | } |
| 39 | func metadata(_ key: String) throws -> DocsOfflineMetadata? { |
| 40 | guard let bytes = try store.read("cache/docs/\(key)/meta") else { return nil } |
| 41 | return try JSONDecoder().decode(DocsOfflineMetadata.self, from: bytes) |
| 42 | } |
| 43 | private func index() throws -> [String: String] { |
| 44 | try store.read("cache/docs/index").map { try JSONDecoder().decode([String: String].self, from: $0) } ?? [:] |
| 45 | } |
| 46 | func saveMetadata(_ metadata: DocsOfflineMetadata, key: String) throws { |
| 47 | // Register the immutable key first. A crash may leave an empty slot, |
| 48 | // never undiscoverable metadata or a rename that Home cannot replay. |
| 49 | var index = try index() |
| 50 | if index[key] == nil { |
| 51 | index[key] = key |
| 52 | try store.write(JSONEncoder().encode(index), to: "cache/docs/index") |
| 53 | } |
| 54 | try store.write(JSONEncoder().encode(metadata), to: "cache/docs/\(key)/meta") |
| 55 | if metadata.draftToken == nil, index[metadata.detail.sqid] != key { |
| 56 | index[metadata.detail.sqid] = key |
| 57 | try store.write(JSONEncoder().encode(index), to: "cache/docs/index") |
| 58 | } |
| 59 | } |
| 60 | func key(for sqid: String) throws -> String { |
| 61 | let index = try index() |
| 62 | if let key = index[sqid] { return key } |
| 63 | // The alias is derived state. Attachment metadata is committed first, |
| 64 | // so scanning registered keys heals a kill before the alias write. |
| 65 | for key in Set(index.values).sorted() { |
| 66 | if let metadata = try metadata(key), metadata.detail.sqid == sqid { |
| 67 | try saveMetadata(metadata, key: key) |
| 68 | return key |
| 69 | } |
| 70 | } |
| 71 | return sqid |
| 72 | } |
| 73 | func ensureMetadataEntry(_ key: String) async throws { |
| 74 | let generation = replicaCache.generation(key) |
| 75 | guard let metadata = try metadata(key), metadata.pendingTitle != nil || metadata.draftToken != nil else { return } |
| 76 | let entries = await outbox.entries(lane: "doc:" + key, excludingInFlight: true) |
| 77 | guard replicaCache.generation(key) == generation, !entries.contains(where: { $0.kind == "metadata" }) else { return } |
| 78 | try await outbox.enqueue(lane: "doc:" + key, kind: "metadata", payload: Data()) |
| 79 | } |
| 80 | func activate() async throws { |
| 81 | try await outbox.load() |
| 82 | // Older K3 records can also be discovered from their durable lane. |
| 83 | let lanes = await outbox.summary.lanes.keys |
| 84 | let keys = Set(try index().values).union(lanes.filter { $0.hasPrefix("doc:") }.map { String($0.dropFirst(4)) }) |
| 85 | for key in keys.sorted() { try await ensureMetadataEntry(key) } |
| 86 | drainer.start(); drainer.kick() |
| 87 | } |
| 88 | private static func form(_ values: [String: String]) -> Data { |
| 89 | var form = URLComponents(); form.queryItems = values.map { URLQueryItem(name: $0.key, value: $0.value) } |
| 90 | return Data((form.percentEncodedQuery ?? "").replacingOccurrences(of: "+", with: "%2B").utf8) |
| 91 | } |
| 92 | private func send(_ lane: String, entries: [OutboxEntry], transport: NativeTransport) async throws -> [UUID: OutboxDrainer.Disposition] { |
| 93 | let key = String(lane.dropFirst(4)), generation = replicaCache.generation(String(lane.dropFirst(4))) |
| 94 | let saved: DocsOfflineMetadata? |
| 95 | do { saved = try metadata(key) } |
| 96 | catch BlobStoreError.corrupt { saved = nil } |
| 97 | catch is DecodingError { saved = nil } |
| 98 | // A missing/corrupt destination cannot be retried into existence. Keep |
| 99 | // its lane for resolution, without mistaking a locked store for loss. |
| 100 | guard lane.hasPrefix("doc:"), var metadata = saved else { |
| 101 | return Dictionary(uniqueKeysWithValues: entries.map { ($0.id, .hold(Hold(.rejected("metadata")))) }) |
| 102 | } |
| 103 | if let token = metadata.draftToken { |
| 104 | let reply = try await transport.responseDetails("/documents", method: "POST", body: Self.form(["title": metadata.detail.title, "creation_token": token]), contentType: "application/x-www-form-urlencoded") |
| 105 | try reply.requireSuccess() |
| 106 | let item = try JSONDecoder().decode(DocumentSummary.self, from: reply.data) |
| 107 | let attached: DocumentDetail = try await transport.request("/d/\(item.sqid)") |
| 108 | guard replicaCache.generation(key) == generation, let latest = try self.metadata(key) else { throw CancellationError() } |
| 109 | metadata = latest |
| 110 | metadata.detail = DocumentDetail(sqid: attached.sqid, title: latest.pendingTitle ?? attached.title, guid: attached.guid, can_write: attached.can_write, can_share: attached.can_share) |
| 111 | metadata.draftToken = nil |
| 112 | // Commit identity before publishing it or attempting text sends. |
| 113 | try saveMetadata(metadata, key: key) |
| 114 | } |
| 115 | while let title = metadata.pendingTitle { |
| 116 | let reply = try await transport.responseDetails("/d/\(metadata.detail.sqid)/title", method: "POST", body: Self.form(["title": title]), contentType: "application/x-www-form-urlencoded") |
| 117 | try reply.requireSuccess() |
| 118 | guard replicaCache.generation(key) == generation, var latest = try self.metadata(key) else { throw CancellationError() } |
| 119 | if latest.pendingTitle == title { latest.pendingTitle = nil; try saveMetadata(latest, key: key) } |
| 120 | metadata = latest // A rename during this POST must also be sent. |
| 121 | } |
| 122 | let updates = entries.filter { $0.kind == "update" } |
| 123 | var dispositions = Dictionary(uniqueKeysWithValues: entries.filter { $0.kind == "metadata" }.map { ($0.id, OutboxDrainer.Disposition.sent) }) |
| 124 | guard !updates.isEmpty else { return dispositions } |
| 125 | let merger = CRDTReplica(guid: metadata.detail.guid) |
| 126 | let update: Data |
| 127 | var sending = updates |
| 128 | do { |
| 129 | _ = try await merger.open(update: Data()) |
| 130 | do { update = try await merger.mergeUpdates(updates.map(\.payload)) } |
| 131 | catch { sending = Array(updates.prefix(1)); update = sending[0].payload } |
| 132 | await merger.close() |
| 133 | } catch { await merger.close(); throw error } |
| 134 | let reply = try await transport.responseDetails("/d/\(metadata.detail.sqid)/updates", method: "POST", body: update, contentType: "application/octet-stream") |
| 135 | try reply.requireSuccess() |
| 136 | var state = update, sequence: Int64 = 0 |
| 137 | if try store.read("cache/docs/\(key)/replica") == nil { |
| 138 | let initial = try await transport.responseDetails("/d/\(metadata.detail.sqid)/updates", maxBytes: 8 * 1024 * 1024) |
| 139 | try initial.requireSuccess() |
| 140 | guard let cursor = Int64(initial.header("Docs-Seq") ?? "") else { throw NativeClientError.invalidResponse } |
| 141 | state = initial.data; sequence = cursor |
| 142 | } |
| 143 | // Keep sent bytes locally before ack can remove their lane files. |
| 144 | try await replicaCache.commit(PersistedReplica(format: 1, sequence: sequence, guid: metadata.detail.guid, savedAt: Date(), state: state), key: key, generation: generation) |
| 145 | for entry in sending { dispositions[entry.id] = .sent } |
| 146 | return dispositions |
| 147 | } |
| 148 | |
| 149 | } |
| 150 | |
| 151 | /// Used only by previews and callers that have no NativeAccount (unit tests). |
| 152 | /// The application always supplies its per-account sealed store. |
| 153 | final class EphemeralDocsStore: BlobStore, @unchecked Sendable { |
| 154 | private let lock = NSLock() |
| 155 | private var files: [String: Data] = [:] |
| 156 | func read(_ path: String) throws -> Data? { lock.withLock { files[path] } } |
| 157 | func write(_ data: Data, to path: String) throws { lock.withLock { files[path] = data } } |
| 158 | func remove(_ path: String) throws { lock.withLock { files = files.filter { $0.key != path && !$0.key.hasPrefix(path + "/") } } } |
| 159 | func list(_ directory: String) throws -> [String] { lock.withLock { |
| 160 | files.keys.filter { $0.hasPrefix(directory + "/") }.map { String($0.dropFirst(directory.count + 1)) }.filter { !$0.contains("/") }.sorted() |
| 161 | } } |
| 162 | } |
| 163 | |
amadan