From f0672b9bc1044adae80755cf7b3336164aafd4e7 Mon Sep 17 00:00:00 2001
From: shrt <payblot@gmail.com>
Date: Mon, 31 Mar 2025 13:54:54 +0200
Subject: [PATCH] new SSE system (downgraded, git add .git add .go with redis
 if productiongit add .git add .); implimented empty lobby deletion

---
 src/app/(routes)/lobby/[id]/page.tsx         |   5 +-
 src/app/(routes)/lobby/page.tsx              |   9 +-
 src/app/_components/lobby/lobby-provider.tsx |  57 ++++---
 src/components/nav-link.tsx                  |  32 ----
 src/components/navbar.tsx                    |  52 ++++++-
 src/lib/store/lobby-store.ts                 |   2 +-
 src/server/api/routers/lobby.ts              | 151 +++++++++++--------
 src/server/events.d.ts                       |  28 ++++
 src/server/redis/events.d.ts                 |  10 --
 src/server/redis/index.ts                    |  11 ++
 src/server/redis/sse-redis.ts                |  73 ---------
 src/server/redis/utils/lobby-utils.ts        |  60 ++++++++
 12 files changed, 277 insertions(+), 213 deletions(-)
 delete mode 100644 src/components/nav-link.tsx
 create mode 100644 src/server/events.d.ts
 delete mode 100644 src/server/redis/events.d.ts
 create mode 100644 src/server/redis/index.ts
 delete mode 100644 src/server/redis/sse-redis.ts
 create mode 100644 src/server/redis/utils/lobby-utils.ts

diff --git a/src/app/(routes)/lobby/[id]/page.tsx b/src/app/(routes)/lobby/[id]/page.tsx
index da684d9..f450413 100644
--- a/src/app/(routes)/lobby/[id]/page.tsx
+++ b/src/app/(routes)/lobby/[id]/page.tsx
@@ -10,12 +10,11 @@ async function Page({
     id: string;
   }>;
 }) {
-  const sessionPlayer = await api.player.getBySession();
   const { id } = await params;
   const lobby = await api.lobby.get({ id });
-  if (!lobby) return notFound();
+  if (!lobby) return <div>Lobby not found</div>;
 
-  return <LobbyPage initialLobby={lobby} sessionPlayer={sessionPlayer} />;
+  return <LobbyPage initialLobby={lobby} />;
 }
 
 export default Page;
diff --git a/src/app/(routes)/lobby/page.tsx b/src/app/(routes)/lobby/page.tsx
index 03d4506..e36b56f 100644
--- a/src/app/(routes)/lobby/page.tsx
+++ b/src/app/(routes)/lobby/page.tsx
@@ -5,11 +5,12 @@ import { Button } from "@/components/ui/button";
 import LobbyPage from "@/app/_components/lobby/lobby-page";
 import { redirect } from "next/navigation";
 import { appRoutes } from "@/config/app.routes";
+import { auth } from "@/server/auth";
 
 async function Page() {
-  const sessionPlayer = await api.player.getBySession();
-  if (!sessionPlayer) return redirect(appRoutes.signIn);
-  const lobby = sessionPlayer ? await api.lobby.getCurrentLobby() : null;
+  const session = await auth();
+  if (!session?.user) return redirect(appRoutes.signIn);
+  const lobby = await api.lobby.getCurrentLobby();
   if (!lobby)
     return (
       <div className="flex w-full gap-4">
@@ -23,7 +24,7 @@ async function Page() {
         </Button>
       </div>
     );
-  return <LobbyPage initialLobby={lobby} sessionPlayer={sessionPlayer} />;
+  return <LobbyPage initialLobby={lobby} />;
 }
 
 export default Page;
diff --git a/src/app/_components/lobby/lobby-provider.tsx b/src/app/_components/lobby/lobby-provider.tsx
index 1c7f0ac..97766cb 100644
--- a/src/app/_components/lobby/lobby-provider.tsx
+++ b/src/app/_components/lobby/lobby-provider.tsx
@@ -2,10 +2,10 @@ import { appRoutes } from "@/config/app.routes";
 import { useSessionPlayerStore } from "@/lib/store/current-player-store";
 import { useLobbyStore } from "@/lib/store/lobby-store";
 import type { Lobby, LobbyMember } from "@/server/db/schema";
-import type { LobbyMemberLeaveEventData } from "@/server/redis/events";
 import { api } from "@/trpc/react";
 import { useRouter } from "next/navigation";
 import React from "react";
+import { toast } from "sonner";
 
 function LobbyProvider({
   children,
@@ -23,29 +23,42 @@ function LobbyProvider({
   const removeMember = useLobbyStore((state) => state.removeMember);
 
   const router = useRouter();
-  api.lobby.onMemberUpdate.useSubscription(undefined, {
-    onData({ data: _data }) {
-      const joined = _data.joined;
-      if (joined) {
-        const data = _data.membership as LobbyMember;
-        addMember(data);
-      } else {
-        const data = _data.membership as LobbyMemberLeaveEventData;
-        removeMember(data.playerId);
-        if (data?.kicked && data?.playerId === sessionPlayer?.id) {
-          router.push(appRoutes.lobby(lobby.id));
-          router.refresh();
-        }
-      }
-    },
-  });
 
-  api.lobby.onUpdate.useSubscription(undefined, {
-    onData({ data }) {
-      if (!data?.lobby) return;
-      updateLobby(data.lobby);
+  const lobbyId = lobby.id ?? "";
+  api.lobby.onMemberUpdate.useSubscription(
+    { lobbyId },
+    {
+      onData({ data }) {
+        if (data.joined) {
+          const member = data.member as LobbyMember;
+          addMember(member);
+        } else {
+          const memberId = data.member as string;
+          removeMember(memberId);
+          if (data?.kicked && memberId === sessionPlayer?.id) {
+            router.push(appRoutes.lobby(lobby.id));
+            router.refresh();
+          }
+        }
+      },
     },
-  });
+  );
+
+  api.lobby.onUpdate.useSubscription(
+    { lobbyId },
+    {
+      onData({ data }) {
+        if (data.deleted) {
+          resetLobby(undefined);
+          router.push(appRoutes.home);
+          router.refresh();
+          toast.error("Lobby got deleted");
+          return;
+        }
+        if (data.lobby) updateLobby(data.lobby);
+      },
+    },
+  );
   React.useEffect(() => {
     resetLobby(initialLobby);
     setMembers(initialLobby?.members ?? []);
diff --git a/src/components/nav-link.tsx b/src/components/nav-link.tsx
deleted file mode 100644
index dd6730b..0000000
--- a/src/components/nav-link.tsx
+++ /dev/null
@@ -1,32 +0,0 @@
-"use client";
-
-import React from "react";
-import { Button } from "./ui/button";
-import Link from "next/link";
-import { usePathname } from "next/navigation";
-import { cn } from "@/lib/utils";
-
-function NavLink({ label, path, className }: NavLink & { className?: string }) {
-  const active = usePathname() === path;
-  return (
-    <Button
-      asChild
-      variant={"ghost"}
-      className={cn(
-        "group hover:bg-border/20 h-10 rounded-none font-bold text-white/50 hover:text-white/50",
-        active && "bg-border/20 text-white hover:text-white",
-        className,
-      )}
-    >
-      <Link href={path}>
-        <span
-          className={"transition-transform duration-150 group-hover:scale-105"}
-        >
-          {label}
-        </span>
-      </Link>
-    </Button>
-  );
-}
-
-export default NavLink;
diff --git a/src/components/navbar.tsx b/src/components/navbar.tsx
index 81a5051..2e88c50 100644
--- a/src/components/navbar.tsx
+++ b/src/components/navbar.tsx
@@ -1,16 +1,22 @@
+"use client";
 import React from "react";
 import { Button } from "./ui/button";
 import Link from "next/link";
 import UserPopover from "@/app/_components/profile-popover";
 import { appConfig } from "@/config/app.config";
-import NavLink from "./nav-link";
-import { api } from "@/trpc/server";
+
 import { Icons } from "./icons";
 import { appRoutes } from "@/config/app.routes";
+import { useSessionPlayerStore } from "@/lib/store/current-player-store";
+import { useLobbyStore } from "@/lib/store/lobby-store";
+import { usePathname } from "next/navigation";
+import { cn } from "@/lib/utils";
 
-async function Navbar() {
-  const sessionPlayer = await api.player.getBySession();
-  const currentLobby = sessionPlayer ? await api.lobby.getCurrentLobby() : null;
+function Navbar() {
+  const sessionPlayer = useSessionPlayerStore((state) => state.sessionPlayer);
+  const currentLobby = useLobbyStore((state) => state.lobby);
+
+  const pathname = usePathname();
 
   return (
     <nav className="flex w-full items-center justify-center p-4">
@@ -18,12 +24,17 @@ async function Navbar() {
         <menu className="flex items-center">
           {appConfig.navigation.map((navLink, idx) => (
             <li key={idx}>
-              <NavLink {...navLink} />
+              <NavLink {...navLink} active={pathname === navLink.path} />
             </li>
           ))}
         </menu>
 
-        <div className="bg-border/10 border-border/20 flex items-center rounded-full border-l-2">
+        <div
+          className={cn(
+            "bg-border/10 border-border/20 hover:bg-background/20 flex items-center rounded-full border-l-2",
+            pathname === appRoutes.currentlobby && "bg-background/20",
+          )}
+        >
           {currentLobby ? (
             <Link href={appRoutes.currentlobby}>
               <div className="border-border/20 flex h-10 items-center justify-center gap-2 pr-2 pl-4 font-semibold">
@@ -45,4 +56,31 @@ async function Navbar() {
   );
 }
 
+const NavLink = ({
+  label,
+  path,
+  active,
+  className,
+}: NavLink & { className?: string; active?: boolean }) => {
+  return (
+    <Button
+      asChild
+      variant={"ghost"}
+      className={cn(
+        "group hover:bg-background/20 h-10 rounded-none font-bold text-white/50 hover:text-white/50",
+        active && "bg-background/20 text-white hover:text-white",
+        className,
+      )}
+    >
+      <Link href={path}>
+        <span
+          className={"transition-transform duration-150 group-hover:scale-105"}
+        >
+          {label}
+        </span>
+      </Link>
+    </Button>
+  );
+};
+
 export default Navbar;
diff --git a/src/lib/store/lobby-store.ts b/src/lib/store/lobby-store.ts
index 4e14d61..867e7ba 100644
--- a/src/lib/store/lobby-store.ts
+++ b/src/lib/store/lobby-store.ts
@@ -20,7 +20,7 @@ export const useLobbyStore = create<LobbyStore>((set, get) => ({
   selectedGame: 0,
   setSelectedGame: (gameId) => set({ selectedGame: gameId }),
   updateLobby: (lobby) =>
-    set((state) => ({ ...state, ...lobby, members: state.members })),
+    set((state) => ({ lobby: { ...state, ...lobby, members: state.members } })),
   setMembers: (members) => set({ members }),
   resetLobby: (lobby) => set({ lobby: lobby ?? ({} as Lobby) }),
   findMember: (playerId) => get().members.find((m) => m.playerId === playerId),
diff --git a/src/server/api/routers/lobby.ts b/src/server/api/routers/lobby.ts
index 2494313..8c645d4 100644
--- a/src/server/api/routers/lobby.ts
+++ b/src/server/api/routers/lobby.ts
@@ -11,14 +11,26 @@ import {
   lobbyPatchSchema,
 } from "@/lib/validations/lobby";
 import { and, eq } from "drizzle-orm";
+import { tracked } from "@trpc/server";
+import type { EventArgs, SSE_EVENTS } from "@/server/events";
+import EventEmitter, { on } from "node:events";
 import {
-  combineRedisIterators,
-  redisAsyncIterator,
-  redisPublish,
-} from "@/server/redis/sse-redis";
-import { tracked, TRPCError } from "@trpc/server";
-import { trcpSubscriptionInput } from "@/lib/validations/trcp";
-import type { LobbyMemberLeaveEventData } from "@/server/redis/events";
+  decreaseLobbyMemberCount,
+  increaseLobbyMemberCount,
+  handleLobbyAfterLeave,
+} from "@/server/redis/utils/lobby-utils";
+
+type EventMap<T> = Record<keyof T, any[]>;
+class IterableEventEmitter<T extends EventMap<T>> extends EventEmitter<T> {
+  toIterable<TEventName extends keyof T & string>(
+    eventName: TEventName,
+    opts?: NonNullable<Parameters<typeof on>[2]>,
+  ): AsyncIterable<T[TEventName]> {
+    return on(this as any, eventName, opts) as any;
+  }
+}
+
+export const ee = new IterableEventEmitter<SSE_EVENTS>();
 
 export const lobbyRouter = createTRPCRouter({
   // queries
@@ -76,14 +88,18 @@ export const lobbyRouter = createTRPCRouter({
         })
         .returning({ id: lobbies.id });
       if (!lobby) throw new Error("Error creating lobby");
-      await ctx.db.insert(lobbyMembers).values({
-        lobbyId: lobby.id,
-        playerId: ctx.session.user.id,
-        isReady: false,
-
-        role: "admin",
-      });
-
+      const [member] = await ctx.db
+        .insert(lobbyMembers)
+        .values({
+          lobbyId: lobby.id,
+          playerId: ctx.session.user.id,
+          isReady: false,
+          role: "admin",
+        })
+        .returning({
+          id: lobbyMembers.playerId,
+        });
+      if (member) increaseLobbyMemberCount(lobby.id);
       return lobby;
     }),
   update: protectedProcedure
@@ -107,7 +123,7 @@ export const lobbyRouter = createTRPCRouter({
         )
         .returning();
 
-      if (lobby) redisPublish("lobby:update", lobby);
+      if (lobby) ee.emit("lobby:update", lobby);
       return lobby;
     }),
   delete: protectedProcedure
@@ -155,8 +171,14 @@ export const lobbyRouter = createTRPCRouter({
                 where: eq(players.id, member.playerId),
               })
             : undefined;
-          if (member) redisPublish("lobby:member:join", { ...member, player });
-          return { success: true, member };
+          if (member) {
+            ee.emit("lobby:member:membership", input.lobbyId, true, {
+              ...member,
+              player,
+            });
+            increaseLobbyMemberCount(input.lobbyId);
+            return { success: true, member };
+          }
         } catch (e: unknown) {
           if (e instanceof Error) {
             if (
@@ -187,9 +209,17 @@ export const lobbyRouter = createTRPCRouter({
             ),
           )
           .returning();
-        if (member)
-          redisPublish("lobby:member:leave", { playerId: member.playerId });
-        return { success: true, member };
+        if (member) {
+          ee.emit(
+            "lobby:member:membership",
+            input.lobbyId,
+            false,
+            member.playerId,
+          );
+          decreaseLobbyMemberCount(input.lobbyId);
+          handleLobbyAfterLeave(input.lobbyId);
+          return { success: true, member };
+        }
       }
     }),
   // admin mutaions
@@ -214,7 +244,7 @@ export const lobbyRouter = createTRPCRouter({
           ),
         )
         .returning();
-      if (member) redisPublish("lobby:member:update", member);
+      if (member) ee.emit("lobby:member:update", member);
       return member;
     }),
 
@@ -238,59 +268,58 @@ export const lobbyRouter = createTRPCRouter({
         )
         .returning();
       if (member)
-        redisPublish("lobby:member:leave", {
-          playerId: member.playerId,
-          kicked: true,
-        });
+        ee.emit(
+          "lobby:member:membership",
+          input.lobbyId,
+          false,
+          member.playerId,
+          true,
+        );
+      decreaseLobbyMemberCount(input.lobbyId);
       return member;
     }),
 
   // subscriptions
   onUpdate: publicProcedure
-    .input(trcpSubscriptionInput)
+    .input(z.object({ lobbyId: z.string() }))
     .subscription(async function* (opts) {
-      if (opts.input?.lastEventId) {
-        // fetch posts from a database that were missed.
+      const iterable = ee.toIterable("lobby:update", {
+        signal: opts.signal,
+      });
+
+      function* maybeYield([lobby, deleted]: EventArgs["lobby:update"]) {
+        if (lobby.id !== opts.input.lobbyId) {
+          return;
+        }
+        yield tracked(lobby.id, { lobby, deleted });
       }
-      for await (const lobby of redisAsyncIterator("lobby:update")) {
-        yield tracked(lobby?.updatedAt?.toString(), {
-          lobby,
-        });
+
+      for await (const args of iterable) {
+        yield* maybeYield(args);
       }
     }),
 
   onMemberUpdate: publicProcedure
-    .input(trcpSubscriptionInput)
+    .input(z.object({ lobbyId: z.string() }))
     .subscription(async function* (opts) {
-      if (opts.input?.lastEventId) {
-        // fetch posts from a database that were missed.
+      const iterable = ee.toIterable("lobby:member:membership", {
+        signal: opts.signal,
+      });
+
+      function* maybeYield([
+        lobbyId,
+        joined,
+        member,
+        kicked,
+      ]: EventArgs["lobby:member:membership"]) {
+        if (lobbyId !== opts.input.lobbyId) {
+          return;
+        }
+        yield tracked(lobbyId, { member, joined, kicked });
       }
 
-      for await (const { event, data: membership } of combineRedisIterators([
-        "lobby:member:join",
-        "lobby:member:leave",
-        "lobby:member:update",
-      ])) {
-        switch (event) {
-          case "lobby:member:join":
-            yield tracked(String(membership.playerId), {
-              joined: true,
-              membership,
-            });
-            break;
-          case "lobby:member:leave":
-            const data = membership as LobbyMemberLeaveEventData;
-            yield tracked(String(membership.playerId), {
-              joined: false,
-              membership: data,
-            });
-            break;
-          // case "lobby:member:update":
-          //   yield tracked(String(membership.playerId), {
-          //     membership,
-          //   });
-          //   break;
-        }
+      for await (const args of iterable) {
+        yield* maybeYield(args);
       }
     }),
 });
diff --git a/src/server/events.d.ts b/src/server/events.d.ts
new file mode 100644
index 0000000..57e3135
--- /dev/null
+++ b/src/server/events.d.ts
@@ -0,0 +1,28 @@
+import type { LobbyMember, Post } from "../db/schema";
+
+export type LobbyMemberLeaveEventData = { playerId: string; kicked?: boolean };
+
+export type EventArgs = {
+  "lobby:member:membership": [
+    // lobbyId
+    string,
+    // joined
+    boolean,
+    // member
+    LobbyMember | string,
+    // kicked
+    boolean?,
+  ];
+  "lobby:update": [
+    //updated Lobby
+    Lobby,
+    // deleted
+    boolean?,
+  ];
+};
+
+export type SSE_EVENTS = {
+  "lobby:update": EventArgs["lobby:update"];
+  "lobby:member:update": [LobbyMember];
+  "lobby:member:membership": EventArgs["lobby:member:membership"];
+};
diff --git a/src/server/redis/events.d.ts b/src/server/redis/events.d.ts
deleted file mode 100644
index db49b1e..0000000
--- a/src/server/redis/events.d.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import type { LobbyMember, Post } from "../db/schema";
-
-export type LobbyMemberLeaveEventData = { playerId: string; kicked?: boolean };
-
-export type PubSubEvents = {
-  "lobby:update": Lobby;
-  "lobby:member:update": LobbyMember;
-  "lobby:member:join": LobbyMember;
-  "lobby:member:leave": LobbyMemberLeaveEventData;
-};
diff --git a/src/server/redis/index.ts b/src/server/redis/index.ts
new file mode 100644
index 0000000..ee71186
--- /dev/null
+++ b/src/server/redis/index.ts
@@ -0,0 +1,11 @@
+import { env } from "@/env";
+import Redis, { type Redis as RedisType } from "ioredis";
+
+const globalForRedis = globalThis as unknown as {
+  redis: RedisType | undefined;
+};
+
+const redisInstance = globalForRedis.redis ?? new Redis();
+if (env.NODE_ENV !== "production") globalForRedis.redis = redisInstance;
+
+export const redis = redisInstance;
diff --git a/src/server/redis/sse-redis.ts b/src/server/redis/sse-redis.ts
deleted file mode 100644
index d8ab121..0000000
--- a/src/server/redis/sse-redis.ts
+++ /dev/null
@@ -1,73 +0,0 @@
-import Redis from "ioredis";
-import type { PubSubEvents } from "./events";
-
-const redisPub = new Redis();
-const redisSub = new Redis();
-
-export const redisPublish = <T extends keyof PubSubEvents>(
-  event: T,
-  data: PubSubEvents[T],
-) => {
-  redisPub.publish(event, JSON.stringify(data));
-};
-
-const redisSubscribe = <T extends keyof PubSubEvents>(
-  event: T,
-  callback: (data: PubSubEvents[T]) => void,
-) => {
-  redisSub.subscribe(event, (err) => {
-    if (err) console.error(`Redis subscription error for ${event}:`, err);
-  });
-
-  redisSub.on("message", (channel, message) => {
-    if (channel === event) {
-      callback(JSON.parse(message) as PubSubEvents[T]);
-    }
-  });
-};
-
-/**
- * Creates an async iterator for a Redis subscription channel.
- * @param event - The Redis event to subscribe to.
- * @returns An async iterator that yields tracked events.
- */
-export function redisAsyncIterator<K extends keyof PubSubEvents>(
-  event: K,
-): AsyncIterableIterator<PubSubEvents[K]> {
-  return {
-    [Symbol.asyncIterator]() {
-      return this;
-    },
-    async next(): Promise<IteratorResult<PubSubEvents[K]>> {
-      return new Promise((resolve) => {
-        redisSubscribe(event, (data: PubSubEvents[K]) => {
-          resolve({ value: data, done: false });
-        });
-      });
-    },
-  };
-}
-
-export async function* combineRedisIterators<T extends keyof PubSubEvents>(
-  events: T[],
-) {
-  const iterators = events.map((event) =>
-    redisAsyncIterator(event)[Symbol.asyncIterator](),
-  );
-
-  while (true) {
-    // Wait for the next event from any iterator
-    const result = await Promise.race(
-      iterators.map((iterator, index) =>
-        iterator.next().then((untypedRes) => {
-          const res = untypedRes as IteratorResult<PubSubEvents[T]>;
-          return { res, event: events[index] };
-        }),
-      ),
-    );
-
-    if (result.res.done) break;
-
-    yield { event: result.event, data: result.res.value };
-  }
-}
diff --git a/src/server/redis/utils/lobby-utils.ts b/src/server/redis/utils/lobby-utils.ts
new file mode 100644
index 0000000..c948db9
--- /dev/null
+++ b/src/server/redis/utils/lobby-utils.ts
@@ -0,0 +1,60 @@
+import { db } from "@/server/db";
+import { redis } from "..";
+import { lobbies, lobbyMembers } from "@/server/db/schema";
+import { count, eq } from "drizzle-orm";
+import { ee } from "@/server/api/routers/lobby";
+
+export async function getLobbyMemberCount(lobbyId: string) {
+  // Check if the count is in the cache
+  const cachedCount = await redis.get(`lobby:${lobbyId}:memberCount`);
+  if (cachedCount !== null) {
+    return parseInt(cachedCount, 10);
+  }
+
+  // If not in cache, query the database
+  const [rawMemberCount] = await db
+    .select({ count: count() })
+    .from(lobbyMembers)
+    .where(eq(lobbyMembers.lobbyId, lobbyId));
+  console.log("rawMemberCount", rawMemberCount);
+
+  const memberCount = rawMemberCount?.count ?? 0;
+  // Cache the result
+  await redis.set(`lobby:${lobbyId}:memberCount`, memberCount);
+  return memberCount;
+}
+
+export async function deleteLobbyIfEmpty(lobbyId: string) {
+  const activeMemberCount = await getLobbyMemberCount(lobbyId);
+  if (activeMemberCount > 0) return;
+
+  const [realMemberCount] = await db
+    .select({ count: count() })
+    .from(lobbyMembers)
+    .where(eq(lobbyMembers.lobbyId, lobbyId));
+  if (realMemberCount?.count === 0) {
+    await db.delete(lobbies).where(eq(lobbies.id, lobbyId));
+    console.log(`Lobby with ID ${lobbyId} has been deleted. (EMPTY_LOBBY)`);
+    // Optionally, remove the cached count
+    await redis.del(`lobby:${lobbyId}:memberCount`);
+    ee.emit("lobby:update", { id: lobbyId }, true);
+  } else {
+    console.error(
+      "!!!!== Redis Cache is out of sync with the database. ==!!!!",
+    );
+  }
+}
+
+export async function addAdminToLobby(lobbyId: string, playerId: string) {}
+
+export async function handleLobbyAfterLeave(lobbyId: string) {
+  await deleteLobbyIfEmpty(lobbyId);
+}
+
+export async function decreaseLobbyMemberCount(lobbyId: string) {
+  await redis.decr(`lobby:${lobbyId}:memberCount`);
+}
+
+export async function increaseLobbyMemberCount(lobbyId: string) {
+  await redis.incr(`lobby:${lobbyId}:memberCount`);
+}