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Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.1/**
2 * An artifact's live connection, whatever its kind: the Yjs document and
3 * everyone's presence, synced over
4 * `wss://<site>/<workspace>/-/artifacts/live?folio=<id>` with the folio's
5 * room (services/docs src/folios/room.ts). Binary frames speak the
6 * y-protocols sync and awareness messages; text frames are the service's
7 * own notices (`FoliosLiveEvent`): a rename, a new suggestion, a version,
8 * a change of access.
9 *
10 * It reconnects with backoff when the socket drops, and says where it is
11 * (`status`) so the page can show "Offline, changes will sync".
12 * Browser-only.
13 */
14import type { FoliosLiveEvent } from "@g1t/contracts";
15import * as decoding from "lib0/decoding";
16import * as encoding from "lib0/encoding";
17import * as awarenessProtocol from "y-protocols/awareness";
18import * as syncProtocol from "y-protocols/sync";
19import * as Y from "yjs";
20
A page opened with an access token keeps its live sockets connected: just before it opens the feed, a conversation or an artifact's room, it asks GET /-/live/ticket with the token for a socket ticket and adds it to the socket's address, because a browser cannot put the Authorization header on a WebSocket. A ticket seals the token and its owner with a key derived from USERCONTENT_KEY, lasts 60 seconds, opens only the socket path it was made for, is read only by a WebSocket upgrade and never by a page, data request, form post or the API, and the token is checked again when the socket opens, so one deleted, expired, revoked or without Use the website as you opens nothing. Sessions open their sockets as before, with no ticket, and the authentication guide and the rate limits notes say how it works.21import { openLive } from "../../lib/live-socket";
Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.22import { heldOpen } from "../../lib/notify-store";
23
24const MESSAGE_SYNC = 0;
25const MESSAGE_AWARENESS = 1;
26const MESSAGE_QUERY_AWARENESS = 3;
27
28export type LiveStatus = "connecting" | "synced" | "offline" | "closed";
29
30export class FolioProvider {
31 readonly doc: Y.Doc;
32 readonly awareness: awarenessProtocol.Awareness;
33 status: LiveStatus = "connecting";
34 private socket: WebSocket | null = null;
35 private attempts = 0;
36 /** When the current connection opened; the backoff starts over only once one holds. */
37 private openedAt: number | null = null;
38 private timer: ReturnType<typeof setTimeout> | null = null;
39 private keepalive: ReturnType<typeof setInterval> | null = null;
40 private stopped = false;
A page opened with an access token keeps its live sockets connected: just before it opens the feed, a conversation or an artifact's room, it asks GET /-/live/ticket with the token for a socket ticket and adds it to the socket's address, because a browser cannot put the Authorization header on a WebSocket. A ticket seals the token and its owner with a key derived from USERCONTENT_KEY, lasts 60 seconds, opens only the socket path it was made for, is read only by a WebSocket upgrade and never by a page, data request, form post or the API, and the token is checked again when the socket opens, so one deleted, expired, revoked or without Use the website as you opens nothing. Sessions open their sockets as before, with no ticket, and the authentication guide and the rate limits notes say how it works.41 /** Between asking for a socket ticket and opening the socket. */
42 private opening = false;
Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.43 private readonly statusListeners = new Set<(status: LiveStatus) => void>();
44 private readonly eventListeners = new Set<(event: FoliosLiveEvent) => void>();
45
46 constructor(
47 private readonly url: string,
48 doc?: Y.Doc,
49 ) {
50 this.doc = doc ?? new Y.Doc();
51 this.awareness = new awarenessProtocol.Awareness(this.doc);
52 this.doc.on("update", this.onDocUpdate);
53 this.awareness.on("update", this.onAwarenessUpdate);
54 if (typeof window !== "undefined") {
55 window.addEventListener("beforeunload", this.onUnload);
56 window.addEventListener("online", this.onOnline);
57 }
58 this.connect();
59 }
60
61 onStatus(listener: (status: LiveStatus) => void): () => void {
62 this.statusListeners.add(listener);
63 listener(this.status);
64 return () => this.statusListeners.delete(listener);
65 }
66
67 onEvent(listener: (event: FoliosLiveEvent) => void): () => void {
68 this.eventListeners.add(listener);
69 return () => this.eventListeners.delete(listener);
70 }
71
72 private setStatus(status: LiveStatus) {
73 if (this.status === status) return;
74 this.status = status;
75 for (const l of this.statusListeners) l(status);
76 }
77
78 private connect() {
A page opened with an access token keeps its live sockets connected: just before it opens the feed, a conversation or an artifact's room, it asks GET /-/live/ticket with the token for a socket ticket and adds it to the socket's address, because a browser cannot put the Authorization header on a WebSocket. A ticket seals the token and its owner with a key derived from USERCONTENT_KEY, lasts 60 seconds, opens only the socket path it was made for, is read only by a WebSocket upgrade and never by a page, data request, form post or the API, and the token is checked again when the socket opens, so one deleted, expired, revoked or without Use the website as you opens nothing. Sessions open their sockets as before, with no ticket, and the authentication guide and the rate limits notes say how it works.79 if (this.stopped || this.opening) return;
Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.80 this.setStatus(this.attempts ? "offline" : "connecting");
A page opened with an access token keeps its live sockets connected: just before it opens the feed, a conversation or an artifact's room, it asks GET /-/live/ticket with the token for a socket ticket and adds it to the socket's address, because a browser cannot put the Authorization header on a WebSocket. A ticket seals the token and its owner with a key derived from USERCONTENT_KEY, lasts 60 seconds, opens only the socket path it was made for, is read only by a WebSocket upgrade and never by a page, data request, form post or the API, and the token is checked again when the socket opens, so one deleted, expired, revoked or without Use the website as you opens nothing. Sessions open their sockets as before, with no ticket, and the authentication guide and the rate limits notes say how it works.81 // A page opened with an access token adds a socket ticket first (lib/live-socket.ts).
82 const target = new URL(this.url);
83 this.opening = true;
84 openLive(
85 target.pathname,
86 () => Object.fromEntries(target.searchParams),
87 (address) => {
88 this.opening = false;
89 this.open(address);
90 },
91 () => {
92 if (!this.stopped) return false;
93 this.opening = false;
94 return true;
95 },
96 );
97 }
98
99 private open(address: string) {
100 const socket = new WebSocket(address);
Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.101 socket.binaryType = "arraybuffer";
102 this.socket = socket;
103 socket.onopen = () => {
104 this.openedAt = Date.now();
105 // Our state vector: the room answers with what we lack, and asks for what it lacks.
106 const encoder = encoding.createEncoder();
107 encoding.writeVarUint(encoder, MESSAGE_SYNC);
108 syncProtocol.writeSyncStep1(encoder, this.doc);
109 socket.send(encoding.toUint8Array(encoder));
110 if (this.awareness.getLocalState() !== null) {
111 const a = encoding.createEncoder();
112 encoding.writeVarUint(a, MESSAGE_AWARENESS);
113 encoding.writeVarUint8Array(a, awarenessProtocol.encodeAwarenessUpdate(this.awareness, [this.doc.clientID]));
114 socket.send(encoding.toUint8Array(a));
115 }
116 const q = encoding.createEncoder();
117 encoding.writeVarUint(q, MESSAGE_QUERY_AWARENESS);
118 socket.send(encoding.toUint8Array(q));
119 if (this.keepalive) clearInterval(this.keepalive);
120 // Answered at the edge without waking the room.
121 this.keepalive = setInterval(() => socket.readyState === WebSocket.OPEN && socket.send("ping"), 25_000);
122 };
123 socket.onmessage = (event) => {
124 if (typeof event.data === "string") {
125 if (event.data === "pong") return;
126 try {
127 const parsed = JSON.parse(event.data) as FoliosLiveEvent;
128 for (const l of this.eventListeners) l(parsed);
129 } catch {
130 // Not ours.
131 }
132 return;
133 }
134 this.receive(new Uint8Array(event.data as ArrayBuffer));
135 };
136 socket.onclose = (event) => {
137 if (this.keepalive) clearInterval(this.keepalive);
138 this.socket = null;
139 // Others stop seeing our cursor; we stop seeing theirs.
140 awarenessProtocol.removeAwarenessStates(
141 this.awareness,
142 [...this.awareness.getStates().keys()].filter((id) => id !== this.doc.clientID),
143 this,
144 );
145 // 4403: no longer allowed; 4410: in the trash. Neither comes back by retrying.
146 if (event.code === 4403 || event.code === 4410 || this.stopped) {
147 this.setStatus("closed");
148 return;
149 }
150 this.setStatus("offline");
151 // Only a connection that held starts the backoff over.
152 if (heldOpen(this.openedAt)) this.attempts = 0;
153 this.openedAt = null;
154 const delay = Math.min(30_000, 500 * 2 ** this.attempts) + Math.random() * 500;
155 this.attempts++;
156 this.timer = setTimeout(() => this.connect(), delay);
157 };
158 }
159
160 private receive(data: Uint8Array) {
161 const decoder = decoding.createDecoder(data);
162 const type = decoding.readVarUint(decoder);
163 if (type === MESSAGE_SYNC) {
164 const encoder = encoding.createEncoder();
165 encoding.writeVarUint(encoder, MESSAGE_SYNC);
166 const step = syncProtocol.readSyncMessage(decoder, encoder, this.doc, this);
167 if (encoding.length(encoder) > 1) this.socket?.send(encoding.toUint8Array(encoder));
168 if (step === syncProtocol.messageYjsSyncStep2) this.setStatus("synced");
169 return;
170 }
171 if (type === MESSAGE_AWARENESS) {
172 awarenessProtocol.applyAwarenessUpdate(this.awareness, decoding.readVarUint8Array(decoder), this);
173 }
174 }
175
176 private onDocUpdate = (update: Uint8Array, origin: unknown) => {
177 if (origin === this) return;
178 const encoder = encoding.createEncoder();
179 encoding.writeVarUint(encoder, MESSAGE_SYNC);
180 syncProtocol.writeUpdate(encoder, update);
181 if (this.socket?.readyState === WebSocket.OPEN) this.socket.send(encoding.toUint8Array(encoder));
182 // While offline, the update stays in the document and goes in the next sync.
183 };
184
185 private onAwarenessUpdate = ({ added, updated, removed }: { added: number[]; updated: number[]; removed: number[] }, origin: unknown) => {
186 if (origin === this) return;
187 const changed = [...added, ...updated, ...removed];
188 const encoder = encoding.createEncoder();
189 encoding.writeVarUint(encoder, MESSAGE_AWARENESS);
190 encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(this.awareness, changed));
191 if (this.socket?.readyState === WebSocket.OPEN) this.socket.send(encoding.toUint8Array(encoder));
192 };
193
194 private onUnload = () => {
195 awarenessProtocol.removeAwarenessStates(this.awareness, [this.doc.clientID], "unload");
196 };
197
198 private onOnline = () => {
A page opened with an access token keeps its live sockets connected: just before it opens the feed, a conversation or an artifact's room, it asks GET /-/live/ticket with the token for a socket ticket and adds it to the socket's address, because a browser cannot put the Authorization header on a WebSocket. A ticket seals the token and its owner with a key derived from USERCONTENT_KEY, lasts 60 seconds, opens only the socket path it was made for, is read only by a WebSocket upgrade and never by a page, data request, form post or the API, and the token is checked again when the socket opens, so one deleted, expired, revoked or without Use the website as you opens nothing. Sessions open their sockets as before, with no ticket, and the authentication guide and the rate limits notes say how it works.199 if (this.socket || this.opening || this.stopped) return;
Artifacts is a mode in the rail, the shell and the phone's tab bar in place of Docs: its home lists everything you can open by day or as cards under All, Yours and Shared with you, with search, filters and tiles to start a doc (slides, designs and dashboards say they are coming soon), and its sidebar holds favorites, spaces, Private, Shared, projects' docs and the trash.200 if (this.timer) clearTimeout(this.timer);
201 this.attempts = 0;
202 this.connect();
203 };
204
205 destroy() {
206 this.stopped = true;
207 if (this.timer) clearTimeout(this.timer);
208 if (this.keepalive) clearInterval(this.keepalive);
209 awarenessProtocol.removeAwarenessStates(this.awareness, [this.doc.clientID], "destroy");
210 this.doc.off("update", this.onDocUpdate);
211 this.awareness.off("update", this.onAwarenessUpdate);
212 if (typeof window !== "undefined") {
213 window.removeEventListener("beforeunload", this.onUnload);
214 window.removeEventListener("online", this.onOnline);
215 }
216 this.socket?.close();
217 this.awareness.destroy();
218 }
219}