WIP: how to respond to too many users

back/src/Controller/IoSocketController.ts

@@ -163,8 +163,8 @@ export class IoSocketController {
                         let memberTags: string[] = [];
                         let memberTextures: CharacterTexture[] = [];
                         const room = await socketManager.getOrCreateRoom(roomId);
-                        if (room.getUsers().size > MAX_USERS_PER_ROOM) {
+                        if (room.isFull()) {
-                            res.writeStatus("302").end('Too many users');
+                            res.writeStatus("503").end('Too many users');
                             return;
                         }
                         try {

back/src/Controller/MapController.ts

@@ -4,6 +4,7 @@ import {HttpRequest, HttpResponse, TemplatedApp} from "uWebSockets.js";
 import {BaseController} from "./BaseController";
 import {parse} from "query-string";
 import {adminApi} from "../Services/AdminApi";
+import {socketManager} from "../Services/SocketManager";
 
 //todo: delete this
 export class MapController extends BaseController{
@@ -12,6 +13,7 @@ export class MapController extends BaseController{
         super();
         this.App = App;
         this.getMapUrl();
+        this.canConnectToMap();
     }
 
 
@@ -67,4 +69,23 @@ export class MapController extends BaseController{
 
         });
     }
+    
+    canConnectToMap() {
+        this.App.options("/canjoin", (res: HttpResponse, req: HttpRequest) => {
+            this.addCorsHeaders(res);
+
+            res.end();
+        });
+
+        this.App.get("/canjoin", (res: HttpResponse, req: HttpRequest) => {
+            const query = parse(req.getQuery());
+            const roomId = query.roomId as string;
+            const world = socketManager.getWorlds().get(roomId);
+            if (!world) {
+                res.writeStatus('404').end('No room found');
+                return;
+            }
+            res.writeStatus("200").end(world.isFull() ? '1':'0');
+        });
+    }
 }

back/src/Model/GameRoom.ts

@@ -10,6 +10,7 @@ import {ViewportInterface} from "_Model/Websocket/ViewportMessage";
 import {Movable} from "_Model/Movable";
 import {extractDataFromPrivateRoomId, extractRoomSlugPublicRoomId, isRoomAnonymous} from "./RoomIdentifier";
 import {arrayIntersect} from "../Services/ArrayHelper";
+import {MAX_USERS_PER_ROOM} from "_Enum/EnvironmentVariable";
 
 export type ConnectCallback = (user: User, group: Group) => void;
 export type DisconnectCallback = (user: User, group: Group) => void;
@@ -179,6 +180,10 @@ export class GameRoom {
         }
     }
 
+    isFull() : boolean {
+        return this.getUsers().size > MAX_USERS_PER_ROOM;
+    }
+
     /**
      * Makes a user leave a group and closes and destroy the group if the group contains only one remaining person.
      *

front/src/Connexion/ConnectionManager.ts

@@ -9,6 +9,11 @@ import {Room} from "./Room";
 
 const URL_ROOM_STARTED = '/Floor0/floor0.json';
 
+export enum connexionErrorTypes {
+    serverError = 1,
+    tooManyUsers,
+}
+
 class ConnectionManager {
     private localUser!:LocalUser;
 
@@ -90,8 +95,12 @@ class ConnectionManager {
         return new Promise<RoomConnection>((resolve, reject) => {
             const connection = new RoomConnection(this.localUser.jwtToken, roomId, name, characterLayers, position, viewport);
             connection.onConnectError((error: object) => {
-                console.log('An error occurred while connecting to socket server. Retrying');
+                console.log(error);
-                reject(error);
+                if (false) { //todo: how to check error type?
+                    reject(connexionErrorTypes.tooManyUsers);
+                } else {
+                    reject(connexionErrorTypes.serverError);
+                }
             });
             connection.onConnect(() => {
                 resolve(connection);
@@ -99,6 +108,8 @@ class ConnectionManager {
         }).catch((err) => {
             // Let's retry in 4-6 seconds
             return new Promise<RoomConnection>((resolve, reject) => {
+                if (err === connexionErrorTypes.tooManyUsers) return reject(err);
+                console.log('An error occurred while connecting to socket server. Retrying');
                 setTimeout(() => {
                     //todo: allow a way to break recurrsion?
                     this.connectToRoomSocket(roomId, name, characterLayers, position, viewport).then((connection) => resolve(connection));

front/src/Phaser/Game/GameScene.ts

@@ -48,13 +48,14 @@ import {ActionableItem} from "../Items/ActionableItem";
 import {UserInputManager} from "../UserInput/UserInputManager";
 import {UserMovedMessage} from "../../Messages/generated/messages_pb";
 import {ProtobufClientUtils} from "../../Network/ProtobufClientUtils";
-import {connectionManager} from "../../Connexion/ConnectionManager";
+import {connectionManager, connexionErrorTypes} from "../../Connexion/ConnectionManager";
 import {RoomConnection} from "../../Connexion/RoomConnection";
 import {GlobalMessageManager} from "../../Administration/GlobalMessageManager";
 import {UserMessageManager} from "../../Administration/UserMessageManager";
 import {ConsoleGlobalMessageManager} from "../../Administration/ConsoleGlobalMessageManager";
 import {ResizableScene} from "../Login/ResizableScene";
 import {Room} from "../../Connexion/Room";
+import {MessageUI} from "../../Logger/MessageUI";
 
 
 export enum Textures {
@@ -122,6 +123,7 @@ export class GameScene extends ResizableScene implements CenterListener {
     // A promise that will resolve when the "create" method is called (signaling loading is ended)
     private createPromise: Promise<void>;
     private createPromiseResolve!: (value?: void | PromiseLike<void>) => void;
+    private offlineMode: boolean = false;
 
     MapKey: string;
     MapUrlFile: string;
@@ -426,7 +428,7 @@ export class GameScene extends ResizableScene implements CenterListener {
         if (this.connection === undefined) {
             // Let's wait 0.5 seconds before printing the "connecting" screen to avoid blinking
             setTimeout(() => {
-                if (this.connection === undefined) {
+                if (this.connection === undefined && !this.offlineMode) {
                     this.scene.sleep();
                     this.scene.launch(ReconnectingSceneName);
                 }
@@ -629,6 +631,11 @@ export class GameScene extends ResizableScene implements CenterListener {
             this.scene.sleep(ReconnectingSceneName);
 
             return connection;
+        }).catch(error => {
+            if (error === connexionErrorTypes.tooManyUsers) {
+                this.offlineMode = true;
+                MessageUI.warningMessage('Too many users. You switched to offline mode. Please try to connect again later.');
+            }
         });
     }
 
@@ -956,13 +963,18 @@ export class GameScene extends ResizableScene implements CenterListener {
 
         const nextSceneKey = this.checkToExit();
         if (nextSceneKey) {
+            this.goToNextScene(nextSceneKey.key);
+        }
+    }
+    
+    private goToNextScene(nextSceneKey: string): void {
+        
         // We are completely destroying the current scene to avoid using a half-backed instance when coming back to the same map.
         this.connection.closeConnection();
         this.simplePeer.unregister();
         this.scene.stop();
         this.scene.remove(this.scene.key);
-            this.scene.start(nextSceneKey.key);
+        this.scene.start(nextSceneKey);
-        }
     }
 
     private checkToExit(): {key: string, hash: string} | null  {