remove entries from clientInfo and roomInfo on disconnect

src/server/index.js

@@ -14,7 +14,7 @@ import { createGameReducer } from '../core/reducer';
 const PING_TIMEOUT = 20 * 1e3;
 const PING_INTERVAL = 10 * 1e3;
 
-function Server({ games, db }) {
+function Server({ games, db, _clientInfo, _roomInfo }) {
   const app = new Koa();
   const io = new IO({
     ioOptions: {
@@ -29,8 +29,8 @@ function Server({ games, db }) {
     db = new InMemory();
   }
 
-  const clientInfo = new Map();
-  const roomInfo = new Map();
+  const clientInfo = _clientInfo || new Map();
+  const roomInfo = _roomInfo || new Map();
 
   for (const game of games) {
     const nsp = app._io.of(game.name);
@@ -71,7 +71,7 @@ function Server({ games, db }) {
           // Get clients connected to this current game.
           const roomClients = roomInfo.get(gameID);
           for (const client of roomClients.values()) {
-            const playerID = clientInfo.get(client).playerID;
+            const { playerID } = clientInfo.get(client);
             const newState = Object.assign({}, state, {
               G: game.playerView(state.G, state.ctx, playerID),
             });
@@ -116,7 +116,11 @@ function Server({ games, db }) {
       });
 
       socket.on('disconnect', () => {
-        clientInfo.delete(socket.id);
+        if (clientInfo.has(socket.id)) {
+          const { gameID } = clientInfo.get(socket.id);
+          roomInfo.get(gameID).delete(socket.id);
+          clientInfo.delete(socket.id);
+        }
       });
     });
   }

src/server/index.test.js

@@ -61,9 +61,56 @@ const game = Game({});
 
 test('basic', () => {
   const server = Server({ games: [game] });
-  const io = server.context.io;
   expect(server).not.toBe(undefined);
-  io.socket.receive('disconnect');
+});
+
+test('connect / disconnect', async () => {
+  const toObj = m => {
+    let o = {};
+    m.forEach((value, key) => {
+      o[key] = value;
+    });
+    return o;
+  };
+
+  const _clientInfo = new Map();
+  const _roomInfo = new Map();
+
+  const server = Server({ games: [game], _clientInfo, _roomInfo });
+  const io = server.context.io;
+
+  io.socket.id = '0';
+  await io.socket.receive('sync', 'gameID', '0', 2);
+  io.socket.id = '1';
+  await io.socket.receive('sync', 'gameID', '1', 2);
+
+  expect(toObj(_clientInfo)).toEqual({
+    '0': { gameID: 'gameID', playerID: '0' },
+    '1': { gameID: 'gameID', playerID: '1' },
+  });
+  expect(toObj(_roomInfo.get('gameID'))).toEqual({ '0': '0', '1': '1' });
+
+  // 0 disconnects.
+
+  io.socket.id = '0';
+  await io.socket.receive('disconnect');
+
+  expect(toObj(_clientInfo)).toEqual({
+    '1': { gameID: 'gameID', playerID: '1' },
+  });
+  expect(toObj(_roomInfo.get('gameID'))).toEqual({ '1': '1' });
+
+  // unknown player disconnects.
+
+  io.socket.id = 'unknown';
+  await io.socket.receive('disconnect');
+
+  // 1 disconnects.
+
+  io.socket.id = '1';
+  await io.socket.receive('disconnect');
+  expect(toObj(_clientInfo)).toEqual({});
+  expect(toObj(_roomInfo.get('gameID'))).toEqual({});
 });
 
 test('sync', async () => {