make next update interval a property on network update component instead of inheritable attribute on entities

engine/components/BoundingBox.ts

@@ -16,6 +16,7 @@ export class BoundingBox extends Component {
   }
 
   public isCollidingWith(box: BoundingBox): boolean {
+    // optimization; when neither rotates just check if they overlap
     if (this.rotation == 0 && box.rotation == 0) {
       const thisTopLeft = this.getTopLeft();
       const thisBottomRight = this.getBottomRight();

engine/components/NetworkUpdateable.ts

@@ -1,7 +1,23 @@
 import { Component, ComponentNames } from '.';
 
 export class NetworkUpdateable extends Component {
-  constructor() {
+  static DEFAULT_UPDATE_JITTER_MS = 30;
+  static DEFAULT_THRESHOLD_TIME_MS = 20;
+
+  public updateThreshold: number;
+  public jitter: number;
+
+  constructor(
+    updateThreshold = NetworkUpdateable.DEFAULT_THRESHOLD_TIME_MS,
+    jitter = NetworkUpdateable.DEFAULT_UPDATE_JITTER_MS
+  ) {
     super(ComponentNames.NetworkUpdateable);
+
+    this.updateThreshold = updateThreshold;
+    this.jitter = jitter;
+  }
+
+  public getNextUpdateTime() {
+    return Math.random() * this.jitter + this.updateThreshold;
   }
 }

engine/entities/Entity.ts

@@ -1,8 +1,7 @@
 import { EntityNames, Floor, Player } from '.';
 import { type Component } from '../components';
 
-const randomId = () =>
-  (performance.now() + Math.random() * 10_000_000).toString();
+const randomId = () => (Math.random() * 1_000_000_000).toString();
 
 export abstract class Entity {
   public id: string;
@@ -59,6 +58,4 @@ export abstract class Entity {
   public abstract setFrom(args: Record<string, any>): void;
 
   public abstract serialize(): Record<string, any>;
-
-  public abstract getNextUpdateInterval(): number;
 }

engine/entities/Floor.ts

@@ -17,7 +17,7 @@ export class Floor extends Entity {
 
     this.addComponent(
       new Sprite(
-        IMAGES.get((Floor.spriteSpec?.states?.get(width) as SpriteSpec).sheet),
+        IMAGES.get(Floor.spriteSpec!.states!.get(width)!.sheet!)!,
         { x: 0, y: 0 },
         { width, height: Floor.spriteSpec.height },
         Floor.spriteSpec.msPerFrame,
@@ -45,8 +45,4 @@ export class Floor extends Entity {
       )
     );
   }
-
-  public getNextUpdateInterval() {
-    return Math.random() * 500;
-  }
 }

engine/entities/Player.ts

@@ -60,7 +60,7 @@ export class Player extends Entity {
     const [leftSprite, rightSprite] = [Direction.LEFT, Direction.RIGHT].map(
       (direction) =>
         new Sprite(
-          IMAGES.get(Player.spriteSpec.states?.get(direction)?.sheet as string),
+          IMAGES.get(Player.spriteSpec.states!.get(direction)!.sheet!)!,
           { x: 0, y: 0 },
           { width: Player.spriteSpec.width, height: Player.spriteSpec.height },
           Player.spriteSpec.msPerFrame,
@@ -102,8 +102,4 @@ export class Player extends Entity {
       new BoundingBox(center, boundingBox.dimension, boundingBox.rotation)
     ].forEach((component) => this.addComponent(component));
   }
-
-  public getNextUpdateInterval() {
-    return Math.random() * 30 + 50;
-  }
 }

engine/systems/NetworkUpdate.ts

@@ -1,6 +1,6 @@
 import { System, SystemNames } from '.';
 import { Game } from '../Game';
-import { ComponentNames } from '../components';
+import { ComponentNames, NetworkUpdateable } from '../components';
 import {
   type MessageQueueProvider,
   type MessagePublisher,
@@ -55,15 +55,20 @@ export class NetworkUpdate extends System {
     // 2. send entity updates
     const updateMessages: EntityUpdateBody[] = [];
 
-    // todo: figure out if we can use the controllable component to determine if we should publish an update
     game.forEachEntityWithComponent(
       ComponentNames.NetworkUpdateable,
       (entity) => {
+        const networkUpdateableComponent =
+          entity.getComponent<NetworkUpdateable>(
+            ComponentNames.NetworkUpdateable
+          );
+        const nextUpdateTime = networkUpdateableComponent.getNextUpdateTime();
+
         const newHash = stringify(entity.serialize());
         let updateInfo: EntityUpdateInfo = this.entityUpdateInfo.get(
           entity.id
         ) ?? {
-          timer: this.getNextUpdateTimeMs(),
+          timer: nextUpdateTime,
           hash: newHash
         };
 
@@ -71,13 +76,11 @@ export class NetworkUpdate extends System {
         updateInfo.timer -= dt;
         this.entityUpdateInfo.set(entity.id, updateInfo);
         if (updateInfo.timer > 0) return;
-        updateInfo.timer = entity.getNextUpdateInterval();
+        updateInfo.timer = nextUpdateTime;
         this.entityUpdateInfo.set(entity.id, updateInfo);
 
-        // maybe update if hash is not consitent
-        if (updateInfo.hash == newHash) {
-          return;
-        }
+        // maybe update, if hash is not consistent
+        if (updateInfo.hash == newHash) return;
         updateInfo.hash = newHash;
         this.entityUpdateInfo.set(entity.id, updateInfo);
 
@@ -102,7 +105,7 @@ export class NetworkUpdate extends System {
     }
   }
 
-  private getNextUpdateInterval(): number {
-    return Math.random() * 30;
+  private getNextUpdateInterval() {
+    return Math.random() * 30 + 20;
   }
 }

server/src/server.ts

@@ -42,7 +42,9 @@ export class GameServer {
         fetch: (req, srv) => this.fetchHandler(req, srv),
         websocket: {
           open: (ws) => this.openWebsocket(ws),
-          message: (ws, msg) => this.websocketMessage(ws, msg),
+          message: (ws, msg) => {
+            if (typeof msg === 'string') this.websocketMessage(ws, msg);
+          },
           close: (ws) => this.closeWebsocket(ws)
         }
       });
@@ -54,21 +56,19 @@ export class GameServer {
 
   private websocketMessage(
     websocket: ServerWebSocket<SessionData>,
-    message: string | Uint8Array
+    message: string
   ) {
-    if (typeof message == 'string') {
-      const receivedMessage = parse<ServerMessage>(message);
-      receivedMessage.sessionData = websocket.data;
+    const receivedMessage = parse<ServerMessage>(message);
+    receivedMessage.sessionData = websocket.data;
 
-      this.messageReceiver.addMessage(receivedMessage);
-    }
+    this.messageReceiver.addMessage(receivedMessage);
   }
 
   private closeWebsocket(websocket: ServerWebSocket<SessionData>) {
     const { sessionId } = websocket.data;
 
     const sessionEntities =
-      this.sessionManager.getSession(sessionId)!.controllableEntities;
+      this.sessionManager.getSession(sessionId)?.controllableEntities;
     this.sessionManager.removeSession(sessionId);
 
     if (!sessionEntities) return;