+ ) : user ? (
+
+ ) : (
+ {
+ if (CAN_STORE_AUTH) {
+ localStorage.setItem(AUTH_KEY, JSON.stringify({ username: name, password }));
+ }
+ // Stubs are callable (that's how capnweb pipelining works), so
+ // never hand one to a state setter bare — React would invoke it
+ // as an updater, which calls the capability itself over RPC.
+ setUser(() => u);
+ setUserName(name);
+ }}
+ />
+ )}
+
+);
+
+// A top-posters entry that flashes its count when it changes — so a live
+// update is obvious. Re-keying the count span on each change restarts the
+// CSS animation.
+const StatItem = ({ author, posts }: { author: string; posts: number }) => {
+ const prev = useRef(posts);
+ const [gen, setGen] = useState(0);
+ useEffect(() => {
+ if (prev.current !== posts) {
+ prev.current = posts;
+ setGen((g) => g + 1);
+ }
+ }, [posts]);
+ return (
+
+ {author}{" "}
+ 0 ? "statFlash 1200ms ease-out" : undefined }}
+ >
+ ×{posts}
+
+
+ );
+};
+
+const RoomView = ({ current, userName }: { current: Current; userName: string }) => {
+ const [messages, setMessages] = useState([]);
+ const [draft, setDraft] = useState("");
+ const [stats, setStats] = useState<{ author: string; posts: number }[] | null>(null);
+ // Stable by-reference callback for the live-stats edit in runStats (below).
+ // Memoized so it isn't a fresh stub every render. `setStats` is identity-
+ // stable, so [] deps are correct.
+ const setStatsByRef = useMemo(() => byRef(setStats), []);
+ const statsSub = useRef<{ unsubscribe: () => unknown } | undefined>(undefined);
+ const bottomRef = useRef(null);
+
+ // Tear down the stats subscription (if the live version is in use) on room
+ // switch / unmount, and dispose the by-ref stub.
+ useEffect(
+ () => () => {
+ void statsSub.current?.unsubscribe();
+ (setStatsByRef as unknown as Disposable)[Symbol.dispose]();
+ },
+ [setStatsByRef],
+ );
+
+ const stopStats = () => {
+ void statsSub.current?.unsubscribe();
+ statsSub.current = undefined;
+ setStats(null);
+ };
+
+ useEffect(() => {
+ // The feed is a client-authored live query: the closure (including the
+ // onNext callback, which crosses by reference) replays in the Durable
+ // Object against the room's granted builder, and the server pushes the
+ // rowset here on every committed change. No polling, no feed endpoint —
+ // and the subscription can't see past the capability it refined.
+ let sub: { unsubscribe: () => unknown } | undefined;
+ let cancelled = false;
+ const onNext = byRef((rows: Msg[]) => {
+ wireLog.push({ kind: "live", t: Date.now(), rows: rows.length });
+ setMessages(rows);
+ });
+ void (async () => {
+ const s = await loggedDoRpc(current.stub, (r) =>
+ r
+ .messages()
+ .select(({ messages, users }) => ({
+ id: messages.id,
+ body: messages.body,
+ author: users.name,
+ at: messages.created_at,
+ }))
+ .orderBy(({ messages }) => messages.id)
+ .live()
+ .observe({ onNext }),
+ );
+ if (cancelled) {
+ void s.unsubscribe();
+ } else {
+ sub = s;
+ }
+ })();
+ return () => {
+ cancelled = true;
+ void sub?.unsubscribe();
+ // Release the by-reference callback stub so it isn't leaked across
+ // room switches / unmounts.
+ onNext[Symbol.dispose]();
+ };
+ }, [current.stub]);
+
+ useEffect(() => {
+ bottomRef.current?.scrollIntoView({ behavior: "smooth" });
+ }, [messages.length]);
+
+ const post = async (e: React.FormEvent) => {
+ e.preventDefault();
+ const body = draft.trim();
+ if (!body) {
+ return;
+ }
+ setDraft("");
+ try {
+ // No refetch: the live subscription pushes the new rowset.
+ await loggedDoRpc(current.stub, (r) => r.post(body).execute());
+ } catch {
+ // The error is already logged to the wire panel; restore the draft so a
+ // transient failure doesn't silently swallow the message.
+ setDraft(body);
+ }
+ };
+
+ const runStats = async () => {
+ // The server has no "top posters" endpoint. This aggregation is
+ // authored here, client-side, and replayed against the room's granted
+ // builder — it cannot reach past this room.
+ //
+ // This is the LIVE version: .live().observe() re-runs the standings on
+ // every committed change and pushes them in via setStatsByRef, so the bar
+ // updates itself. The one-shot "what if" would drop the subscription:
+ // const rows = await loggedDoRpc(current.stub, (r) =>
+ // r.messages().groupBy(...).select(...).orderBy(...).execute());
+ // setStats(rows);
+ void statsSub.current?.unsubscribe(); // replace any existing subscription
+ const stats = await loggedDoRpc(current.stub, (r) =>
+ r
+ .messages()
+ .groupBy(({ users }) => [users.name])
+ .select(({ users, messages }) => ({ author: users.name, posts: messages.id.count() }))
+ .orderBy(({ messages }) => [messages.id.count(), "desc"])
+ .live()
+ .observe({ onNext: setStatsByRef })
+ );
+ };
+
+ return (
+
+
+
#{current.name}
+
+
+
+ {stats && (
+
+ top posters:
+ {stats.map((s) => (
+
+ ))}
+
+
+ )}
+
+
+ {messages.map((m) => (
+
+
+ {m.author}
+
+ {m.at.slice(11, 16)} UTC
+
{m.body}
+
+ ))}
+
+
+
+
+
+ );
+};
+
+const SNIPPETS = [
+ {
+ title: "List the room directory",
+ code: `await doRpc(user, (u) =>
+ u.directory()
+ .select(({ rooms }) => ({ id: rooms.id, name: rooms.name }))
+ .execute())`,
+ },
+ {
+ title: "Aggregate — top posters in a room (no server endpoint)",
+ code: `await doRpc(room, (r) =>
+ r.messages()
+ .groupBy(({ users }) => [users.name])
+ .select(({ users, messages }) => ({ author: users.name, posts: messages.id.count() }))
+ .orderBy(({ messages }) => [messages.id.count(), "desc"])
+ .execute())`,
+ },
+ {
+ title: "Filter my rooms by name",
+ code: `await doRpc(user, (u) =>
+ u.directory()
+ .where(({ rooms }) => rooms.name.eq("lobby"))
+ .select(({ rooms }) => ({ id: rooms.id, name: rooms.name }))
+ .execute())`,
+ },
+ {
+ title: "Splice the room into one transcript — SQLite group_concat",
+ code: `await doRpc(room, (r) =>
+ r.messages()
+ .select(({ messages }) => ({ transcript: messages.body.groupConcat("\\n") }))
+ .execute())`,
+ },
+];
+
+const ConsolePlayground = () => (
+ // Scroll container: center the content when it fits, scroll (not overflow
+ // onto the neighboring panes) once it's taller than the pane — e.g. zoomed in.
+
+
+
+ Pick a room on the left — or author a query yourself: click a snippet to load it into the wire prompt
+ below (user, room (your
+ current room, or #lobby),{" "}
+ doRpc, byRef are in scope).
+
+ {SNIPPETS.map((s) => (
+
+ ))}
+
+ The client composes these queries; each replays inside the Durable Object against the capability you
+ hold. There's no per-query authorization — access is reachability.
+