diff --git a/src/core/draw.js b/src/core/draw.js
index 98650b0..2f97cea 100644
--- a/src/core/draw.js
+++ b/src/core/draw.js
@@ -5,7 +5,7 @@ import { using } from 'bluebird';
 import type { User } from '../data/models';
 import { redlock } from '../data/redis';
 import { getChunkOfPixel, getOffsetOfPixel } from './utils';
-import { broadcastPixel } from '../socket/websockets';
+import webSockets from '../socket/websockets';
 import logger from './logger';
 import RedisCanvas from '../data/models/RedisCanvas';
 import { registerPixelChange } from './tileserver';
@@ -29,7 +29,7 @@ export function setPixel(
   const [i, j] = getChunkOfPixel([x, y], canvasSize);
   const offset = getOffsetOfPixel(x, y, canvasSize);
   RedisCanvas.setPixelInChunk(i, j, offset, color, canvasId);
-  broadcastPixel(canvasId, i, j, offset, color);
+  webSockets.broadcastPixel(canvasId, i, j, offset, color);
 }
 
 /**
diff --git a/src/core/utils.js b/src/core/utils.js
index a0de380..4e33215 100644
--- a/src/core/utils.js
+++ b/src/core/utils.js
@@ -22,6 +22,17 @@ export function sum(values: Array<number>): number {
   return total;
 }
 
+/*
+ * returns random integer
+ * @param min Minimum of random integer
+ * @param max Maximum of random integer
+ * @return random integer between min and max (min <= ret <= max)
+ */
+export function getRandomInt(min, max) {
+  const range = max - min + 1;
+  return min + (Math.floor(Math.random() * range));
+}
+
 export function distMax([x1, y1]: Cell, [x2, y2]: Cell): number {
   return Math.max(Math.abs(x1 - x2), Math.abs(y1 - y2));
 }
diff --git a/src/data/models/RedisCanvas.js b/src/data/models/RedisCanvas.js
index 4e06cc5..bb56e3c 100644
--- a/src/data/models/RedisCanvas.js
+++ b/src/data/models/RedisCanvas.js
@@ -72,7 +72,7 @@ class RedisCanvas {
     RedisCanvas.registerChunkChange(canvasId, [i, j]);
   }
 
-  static async getPixel(
+  static async getPixelIfExists(
     x: number,
     y: number,
     canvasId: number,
@@ -81,7 +81,6 @@ class RedisCanvas {
     // 3rd bit -> protected or not
     // rest (5 bits) -> index of color
     const canvasSize = canvases[canvasId].size;
-    const canvasAlpha = canvases[canvasId].alpha;
     const [i, j] = getChunkOfPixel([x, y], canvasSize);
     const offset = getOffsetOfPixel(x, y, canvasSize);
     const args = [
@@ -91,9 +90,19 @@ class RedisCanvas {
       `#${offset}`,
     ];
     const result: ?number = await redis.sendCommandAsync('bitfield', args);
-    if (!result) return canvasAlpha;
+    if (!result) return null;
     const color = result[0];
-    return color || canvasAlpha;
+    return color;
+  }
+
+  static async getPixel(
+    x: number,
+    y: number,
+    canvasId: number,
+  ): Promise<number> {
+    const canvasAlpha = canvases[canvasId].alpha;
+    const clr = RedisCanvas.getPixelIfExists(x, y, canvasId);
+    return (clr == null) ? canvasAlpha : clr;
   }
 }
 
diff --git a/src/routes/api/auth/mclink.js b/src/routes/api/auth/mclink.js
index 9df3ad3..bb6e472 100644
--- a/src/routes/api/auth/mclink.js
+++ b/src/routes/api/auth/mclink.js
@@ -5,7 +5,7 @@
 
 import type { Request, Response } from 'express';
 
-import { broadcastMinecraftLink } from '../../../socket/websockets';
+import webSockets from '../../../socket/websockets';
 
 
 export default async (req: Request, res: Response) => {
@@ -40,5 +40,5 @@ export default async (req: Request, res: Response) => {
   } else {
     return;
   }
-  broadcastMinecraftLink(name, minecraftid, accepted);
+  webSockets.broadcastMinecraftLink(name, minecraftid, accepted);
 };
diff --git a/src/routes/api/mctp.js b/src/routes/api/mctp.js
index 02747e9..3f18b4e 100644
--- a/src/routes/api/mctp.js
+++ b/src/routes/api/mctp.js
@@ -10,7 +10,7 @@
 import type { Request, Response } from 'express';
 
 import canvases from '../../canvases.json';
-import { broadcastMinecraftTP } from '../../socket/websockets';
+import webSockets from '../../socket/websockets';
 
 const CANVAS_MAX_XY = (canvases[0].size / 2);
 const CANVAS_MIN_XY = -CANVAS_MAX_XY;
@@ -47,7 +47,7 @@ export default async (req: Request, res: Response) => {
     return;
   }
 
-  await broadcastMinecraftTP(minecraftid, x, y);
+  webSockets.broadcastMinecraftTP(minecraftid, x, y);
 
   res.json({
     success: true,
diff --git a/src/socket/APISocketServer.js b/src/socket/APISocketServer.js
index f5f81fc..28c477a 100644
--- a/src/socket/APISocketServer.js
+++ b/src/socket/APISocketServer.js
@@ -8,17 +8,15 @@
  * @flow */
 
 
-import EventEmitter from 'events';
 import WebSocket from 'ws';
 
 
+import WebSocketEvents from './WebSocketEvents';
+import webSockets from './websockets';
 import { getIPFromRequest } from '../utils/ip';
 import Minecraft from '../core/minecraft';
 import { drawUnsafe, setPixel } from '../core/draw';
 import logger from '../core/logger';
-import redis from '../data/redis';
-import ChatHistory from './ChatHistory';
-import { broadcastChatMessage, notifyChangedMe } from './websockets';
 import { APISOCKET_KEY } from '../core/config';
 
 function heartbeat() {
@@ -39,13 +37,14 @@ async function verifyClient(info, done) {
 }
 
 
-class APISocketServer extends EventEmitter {
+class APISocketServer extends WebSocketEvents {
   wss: WebSocket.Server;
   mc: Minecraft;
 
   constructor() {
     super();
     logger.info('Starting API websocket server');
+    webSockets.addListener(this);
 
     const wss = new WebSocket.Server({
       perMessageDeflate: false,
@@ -79,7 +78,9 @@ class APISocketServer extends EventEmitter {
     setInterval(this.ping, 45 * 1000);
   }
 
-  broadcastChatMessage(name, msg, ws = null) {
+  broadcastChatMessage(name, msg, sendapi, ws = null) {
+    if (!sendapi) return;
+
     const sendmsg = JSON.stringify(['msg', name, msg]);
     this.wss.clients.forEach((client) => {
       if (client !== ws && client.subChat && client.readyState === WebSocket.OPEN) {
@@ -127,7 +128,8 @@ class APISocketServer extends EventEmitter {
     });
   }
 
-  broadcastPixelBuffer(chunkid, buffer) {
+  broadcastPixelBuffer(canvasId, chunkid, buffer) {
+    if (canvasId !== 0) return;
     const frame = WebSocket.Sender.frame(buffer, {
       readOnly: true,
       mask: false,
@@ -228,21 +230,21 @@ class APISocketServer extends EventEmitter {
         const [minecraftname, msg] = packet;
         const user = this.mc.minecraftname2User(minecraftname);
         const chatname = (user.id) ? `[MC] ${user.regUser.name}` : `[MC] ${minecraftname}`;
-        broadcastChatMessage(chatname, msg, false);
-        this.broadcastChatMessage(chatname, msg, ws);
+        webSockets.broadcastChatMessage(chatname, msg, false);
+        this.broadcastChatMessage(chatname, msg, true, ws);
         return;
       }
       if (command == 'chat') {
         const [name, msg] = packet;
-        broadcastChatMessage(name, msg, false);
-        this.broadcastChatMessage(name, msg, ws);
+        webSockets.broadcastChatMessage(name, msg, false);
+        this.broadcastChatMessage(name, msg, true, ws);
         return;
       }
       if (command == 'linkacc') {
         const [minecraftid, minecraftname, name] = packet;
         const ret = await this.mc.linkacc(minecraftid, minecraftname, name);
         if (!ret) {
-          notifyChangedMe(name);
+          webSockets.notifyChangedMe(name);
         }
         ws.send(JSON.stringify([
           'linkret',
diff --git a/src/socket/SocketServer.js b/src/socket/SocketServer.js
index bb6538a..d9b0f93 100644
--- a/src/socket/SocketServer.js
+++ b/src/socket/SocketServer.js
@@ -1,7 +1,6 @@
 /* @flow */
 
 
-import EventEmitter from 'events';
 import WebSocket from 'ws';
 
 import logger from '../core/logger';
@@ -16,12 +15,12 @@ import DeRegisterChunk from './packets/DeRegisterChunk';
 import DeRegisterMultipleChunks from './packets/DeRegisterMultipleChunks';
 import RequestChatHistory from './packets/RequestChatHistory';
 import CoolDownPacket from './packets/CoolDownPacket';
-import PixelUpdate from './packets/PixelUpdate';
 import ChangedMe from './packets/ChangedMe';
 
 import ChatHistory from './ChatHistory';
 import authenticateClient from './verifyClient';
-import { broadcastChatMessage } from './websockets';
+import WebSocketEvents from './WebSocketEvents';
+import webSockets from './websockets';
 
 
 const ipCounter: Counter<string> = new Counter();
@@ -46,7 +45,7 @@ async function verifyClient(info, done) {
 }
 
 
-class SocketServer extends EventEmitter {
+class SocketServer extends WebSocketEvents {
   wss: WebSocket.Server;
   CHUNK_CLIENTS: Map<number, Array>;
 
@@ -55,6 +54,7 @@ class SocketServer extends EventEmitter {
     super();
     this.CHUNK_CLIENTS = new Map();
     logger.info('Starting websocket server');
+    webSockets.addListener(this);
 
     const wss = new WebSocket.Server({
       perMessageDeflate: false,
@@ -92,14 +92,20 @@ class SocketServer extends EventEmitter {
         this.deleteAllChunks(ws);
       });
       ws.on('message', (message) => {
-        if (typeof message === 'string') { this.onTextMessage(message, ws); } else { this.onBinaryMessage(message, ws); }
+        if (typeof message === 'string') {
+          this.onTextMessage(message, ws);
+        } else {
+          this.onBinaryMessage(message, ws);
+        }
       });
     });
 
+    this.onlineCounterBroadcast = this.onlineCounterBroadcast.bind(this);
     this.ping = this.ping.bind(this);
     this.killOld = this.killOld.bind(this);
 
     setInterval(this.killOld, 10 * 60 * 1000);
+    setInterval(this.onlineCounterBroadcast, 10 * 1000);
     // https://github.com/websockets/ws#how-to-detect-and-close-broken-connections
     setInterval(this.ping, 45 * 1000);
   }
@@ -130,7 +136,12 @@ class SocketServer extends EventEmitter {
     });
   }
 
-  broadcastText(text: string) {
+  broadcastOnlineCounter(buffer: Buffer) {
+    this.broadcast(buffer);
+  }
+
+  broadcastChatMessage(name: string, message: string) {
+    const text = JSON.stringify([name, message]);
     this.wss.clients.forEach((ws) => {
       if (ws.readyState == WebSocket.OPEN) {
         ws.send(text);
@@ -171,10 +182,6 @@ class SocketServer extends EventEmitter {
     });
   }
 
-  getConnections(): number {
-    return this.wss.clients.size || 0;
-  }
-
   killOld() {
     const now = Date.now();
     this.wss.clients.forEach((ws) => {
@@ -192,13 +199,18 @@ class SocketServer extends EventEmitter {
     });
   }
 
+  onlineCounterBroadcast() {
+    const online = this.wss.clients.size || 0;
+    webSockets.broadcastOnlineCounter(online);
+  }
+
   onTextMessage(message, ws) {
     if (ws.name && message) {
       const waitLeft = ws.rateLimiter.tick();
       if (waitLeft) {
         ws.send(JSON.stringify(['info', `You are sending messages too fast, you have to wait ${Math.floor(waitLeft / 1000)}s :(`]));
       } else {
-        broadcastChatMessage(ws.name, message);
+        webSockets.broadcastChatMessage(ws.name, message);
       }
     } else {
       logger.info('Got empty message or message from unidentified ws');
@@ -256,7 +268,7 @@ class SocketServer extends EventEmitter {
 
   pushChunk(chunkid, ws) {
     if (!this.CHUNK_CLIENTS.has(chunkid)) {
-      this.CHUNK_CLIENTS.set(chunkid, new Array());
+      this.CHUNK_CLIENTS.set(chunkid, []);
     }
     const clients = this.CHUNK_CLIENTS.get(chunkid);
     const pos = clients.indexOf(ws);
diff --git a/src/socket/WebSocketEvents.js b/src/socket/WebSocketEvents.js
new file mode 100644
index 0000000..6db6b33
--- /dev/null
+++ b/src/socket/WebSocketEvents.js
@@ -0,0 +1,33 @@
+/* @flow
+ *
+ * Parent class for socket servers
+ *
+ */
+
+/* eslint-disable no-unused-vars */
+/* eslint-disable class-methods-use-this */
+
+class WebSocketEvents {
+  broadcast(message: Buffer) {
+  }
+
+  broadcastPixelBuffer(canvasId: number, chunkid: number, buffer: Buffer) {
+  }
+
+  broadcastChatMessage(name: string, message: string) {
+  }
+
+  broadcastMinecraftLink(name: string, minecraftid: string, accepted: boolean) {
+  }
+
+  notifyChangedMe(name: string) {
+  }
+
+  broadcastMinecraftTP(minecraftid: string, x: number, y: number) {
+  }
+
+  broadcastOnlineCounter(data: Buffer) {
+  }
+}
+
+export default WebSocketEvents;
diff --git a/src/socket/packets/OnlineCounter.js b/src/socket/packets/OnlineCounter.js
index 02517d7..4e4999f 100644
--- a/src/socket/packets/OnlineCounter.js
+++ b/src/socket/packets/OnlineCounter.js
@@ -23,5 +23,6 @@ export default {
 
       return buffer;
     }
+    return 0;
   },
 };
diff --git a/src/socket/packets/PixelUpdate.js b/src/socket/packets/PixelUpdate.js
index 974ca9d..98c0fea 100644
--- a/src/socket/packets/PixelUpdate.js
+++ b/src/socket/packets/PixelUpdate.js
@@ -2,12 +2,6 @@
 
 
 import type { ColorIndex } from '../../core/Palette';
-import {
-  getChunkOfPixel,
-  getOffsetOfPixel,
-  getPixelFromChunkOffset,
-} from '../../core/utils';
-
 
 type PixelUpdatePacket = {
   x: number,
@@ -42,5 +36,6 @@ export default {
 
       return buffer;
     }
+    return null;
   },
 };
diff --git a/src/socket/verifyClient.js b/src/socket/verifyClient.js
index 64e0493..c60036b 100644
--- a/src/socket/verifyClient.js
+++ b/src/socket/verifyClient.js
@@ -4,7 +4,6 @@
 
 import express from 'express';
 
-import logger from '../core/logger';
 import session from '../core/session';
 import passport from '../core/passport';
 import { User } from '../data/models';
@@ -19,7 +18,6 @@ router.use(session);
  * (cut IPv6 to subnet to prevent abuse)
  */
 router.use(async (req, res, next) => {
-  const { session } = req;
   const ip = await getIPFromRequest(req);
   const trueIp = ip || '0.0.0.1';
   req.trueIp = trueIp;
@@ -33,9 +31,9 @@ router.use(passport.initialize());
 router.use(passport.session());
 
 
-export function authenticateClient(req) {
+function authenticateClient(req) {
   return new Promise(
-    ((resolve, reject) => {
+    ((resolve) => {
       router(req, {}, () => {
         if (req.user) {
           resolve(req.user);
diff --git a/src/socket/websockets.js b/src/socket/websockets.js
index 5293976..1dba69a 100644
--- a/src/socket/websockets.js
+++ b/src/socket/websockets.js
@@ -5,123 +5,127 @@
  *
  */
 
-import url from 'url';
-
 import logger from '../core/logger';
-import { SECOND } from '../core/constants';
-import { getChunkOfPixel } from '../core/utils';
-
 import ChatHistory from './ChatHistory';
-import SocketServer from './SocketServer';
-import APISocketServer from './APISocketServer';
 import OnlineCounter from './packets/OnlineCounter';
 import PixelUpdate from './packets/PixelUpdate';
 
-const usersocket = new SocketServer();
-const apisocket = new APISocketServer();
 
-/*
- * broadcast message via websocket
- * @param message Message to send
- */
-export async function broadcast(message: Buffer) {
-  if (usersocket) usersocket.broadcast(message);
-}
+class WebSockets {
+  listeners: Array<Object>;
 
-/*
- * broadcast pixel message via websocket
- * @param canvasIdent ident of canvas
- * @param i x coordinates of chunk
- * @param j y coordinates of chunk
- * @param offset offset of pixel within this chunk
- * @param color colorindex
- */
-export async function broadcastPixel(
-  canvasId: number,
-  i: number,
-  j: number,
-  offset: number,
-  color: number,
-) {
-  const chunkid = (i << 8) | j;
-  const buffer = PixelUpdate.dehydrate(i, j, offset, color);
-  if (usersocket) usersocket.broadcastPixelBuffer(canvasId, chunkid, buffer);
-  if (apisocket && canvasId == 0) apisocket.broadcastPixelBuffer(chunkid, buffer);
-}
+  constructor() {
+    this.listeners = [];
+  }
 
-/*
- * broadcast chat message
- * @param name chatname
- * @param message Message to send
- * @param sendapi If chat message should get boradcasted to api websocket
- *                (usefull if the api is supposed to not answer to its own messages)
- */
-export async function broadcastChatMessage(name: string, message: string, sendapi: boolean = true) {
-  logger.info(`Received chat message ${message} from ${name}`);
-  ChatHistory.addMessage(name, message);
-  if (usersocket) usersocket.broadcastText(JSON.stringify([name, message]));
-  if (sendapi && apisocket) apisocket.broadcastChatMessage(name, message);
-}
+  addListener(listener) {
+    this.listeners.push(listener);
+  }
 
-/*
- * broadcast minecraft linking to API
- * @param name pixelplanetname
- * @param minecraftid minecraftid
- * @param accepted If link request got accepted
- */
-export async function broadcastMinecraftLink(name: string, minecraftid: string, accepted: boolean) {
-  if (apisocket) apisocket.broadcastMinecraftLink(name, minecraftid, accepted);
-}
+  /*
+   * broadcast message via websocket
+   * @param message Message to send
+   */
+  broadcast(message: Buffer) {
+    this.listeners.forEach(
+      (listener) => listener.broadcast(message),
+    );
+  }
 
-/*
- * Notify user on websocket that he should rerequest api/message
- * Currently just used for getting minecraft link message.
- */
-export async function notifyChangedMe(name: string) {
-  if (usersocket) usersocket.notifyChangedMe(name);
-}
+  /*
+   * broadcast pixel message via websocket
+   * @param canvasIdent ident of canvas
+   * @param i x coordinates of chunk
+   * @param j y coordinates of chunk
+   * @param offset offset of pixel within this chunk
+   * @param color colorindex
+   */
+  broadcastPixel(
+    canvasId: number,
+    i: number,
+    j: number,
+    offset: number,
+    color: number,
+  ) {
+    const chunkid = (i << 8) | j;
+    const buffer = PixelUpdate.dehydrate(i, j, offset, color);
+    this.listeners.forEach(
+      (listener) => listener.broadcastPixelBuffer(canvasId, chunkid, buffer),
+    );
+  }
 
-/*
- * broadcast mc tp request to API
- * @param minecraftid minecraftid
- * @param x x coords
- * @param y y coords
- */
-export async function broadcastMinecraftTP(minecraftid, x, y) {
-  if (apisocket) apisocket.broadcastMinecraftTP(minecraftid, x, y);
-}
+  /*
+   * broadcast chat message
+   * @param name chatname
+   * @param message Message to send
+   * @param sendapi If chat message should get boradcasted to api websockets
+   *                (usefull if the api is supposed to not answer to its own messages)
+   */
+  broadcastChatMessage(
+    name: string,
+    message: string,
+    sendapi: boolean = true,
+  ) {
+    logger.info(`Received chat message ${message} from ${name}`);
+    ChatHistory.addMessage(name, message);
+    this.listeners.forEach(
+      (listener) => listener.broadcastChatMessage(name, message, sendapi),
+    );
+  }
 
-/*
- * send websocket package of online counter every x seconds
- */
-function startOnlineCounterBroadcast() {
-  setInterval(() => {
-    if (usersocket) {
-      const online = usersocket.getConnections();
-      const buffer = OnlineCounter.dehydrate({ online });
-      usersocket.broadcast(buffer);
-      if (apisocket) apisocket.broadcastOnlineCounter(buffer);
-    }
-  }, 15 * SECOND);
-}
-startOnlineCounterBroadcast();
+  /*
+   * broadcast minecraft linking to API
+   * @param name pixelplanetname
+   * @param minecraftid minecraftid
+   * @param accepted If link request got accepted
+   */
+  broadcastMinecraftLink(
+    name: string,
+    minecraftid: string,
+    accepted: boolean,
+  ) {
+    this.listeners.forEach(
+      (listener) => listener.broadcastMinecraftLink(
+        name,
+        minecraftid,
+        accepted,
+      ),
+    );
+  }
 
-/*
- * websocket upgrade / establishing connection
- * Get hooked up to httpServer and routes to the right socket
- */
-export function wsupgrade(request, socket, head) {
-  const { pathname } = url.parse(request.url);
+  /*
+   * Notify user on websocket that he should rerequest api/message
+   * Currently just used for getting minecraft link message.
+   */
+  notifyChangedMe(name: string) {
+    this.listeners.forEach(
+      (listener) => listener.notifyChangedMe(name),
+    );
+  }
 
-  if (pathname === '/ws') {
-    usersocket.wss.handleUpgrade(request, socket, head, (ws) => {
-      usersocket.wss.emit('connection', ws, request);
-    });
-  } else if (pathname === '/mcws') {
-    apisocket.wss.handleUpgrade(request, socket, head, (ws) => {
-      apisocket.wss.emit('connection', ws, request);
-    });
-  } else {
-    socket.destroy();
+  /*
+   * broadcast mc tp request to API
+   * @param minecraftid minecraftid
+   * @param x x coords
+   * @param y y coords
+   */
+  broadcastMinecraftTP(minecraftid, x, y) {
+    this.listeners.forEach(
+      (listener) => listener.broadcastMinecraftTP(minecraftid, x, y),
+    );
+  }
+
+  /*
+   * broadcast online counter
+   * @param online Number of users online
+   */
+  broadcastOnlineCounter(online: number) {
+    const buffer = OnlineCounter.dehydrate({ online });
+    this.listeners.forEach(
+      (listener) => listener.broadcastOnlineCounter(buffer),
+    );
   }
 }
+
+const webSockets = new WebSockets();
+export default webSockets;
diff --git a/src/web.js b/src/web.js
index b5142a7..650906b 100644
--- a/src/web.js
+++ b/src/web.js
@@ -1,5 +1,6 @@
 /* @flow */
 
+import url from 'url';
 import path from 'path';
 import compression from 'compression';
 import express from 'express';
@@ -14,6 +15,9 @@ import logger from './core/logger';
 import rankings from './core/ranking';
 import models from './data/models';
 
+import SocketServer from './socket/SocketServer';
+import APISocketServer from './socket/APISocketServer';
+
 import {
   api,
   tiles,
@@ -28,7 +32,6 @@ import { SECOND, MONTH } from './core/constants';
 import { PORT, DISCORD_INVITE } from './core/config';
 
 import { ccToCoords } from './utils/location';
-import { wsupgrade } from './socket/websockets';
 import { startAllCanvasLoops } from './core/tileserver';
 
 startAllCanvasLoops();
@@ -41,8 +44,30 @@ app.disable('x-powered-by');
 // Call Garbage Collector every 30 seconds
 setInterval(forceGC, 15 * 60 * SECOND);
 
-// create websocket
+// create http server
 const server = http.createServer(app);
+
+
+//
+// websockets
+// -----------------------------------------------------------------------------
+const usersocket = new SocketServer();
+const apisocket = new APISocketServer();
+function wsupgrade(request, socket, head) {
+  const { pathname } = url.parse(request.url);
+
+  if (pathname === '/ws') {
+    usersocket.wss.handleUpgrade(request, socket, head, (ws) => {
+      usersocket.wss.emit('connection', ws, request);
+    });
+  } else if (pathname === '/mcws') {
+    apisocket.wss.handleUpgrade(request, socket, head, (ws) => {
+      apisocket.wss.emit('connection', ws, request);
+    });
+  } else {
+    socket.destroy();
+  }
+}
 server.on('upgrade', wsupgrade);