replace redis by in-memory object

helpers/redis.js

 'use strict';
 
-const RedisConnection = require('ioredis');
-const websockets = require('./websockets');
+var notRedis = {
+  state: {},
+  topics: {},
+  
+  publish: function(topic, msg, cb) {
+    //console.log("[notredis] publish",topic,msg);
+    if (!this.topics[topic]) {
+      this.topics[topic] = {
+        subscribers: []
+      };
+    }
+    var t=this.topics[topic];
+    for (var i=0; i<t.subscribers.length; i++) {
+      var s=t.subscribers[i];
+      if (s.handler) {
+        s.handler(topic, msg);
+      }
+    }
+    if (cb) cb(null);
+  },
+
+  subscribe: function(topics, cb) {
+    var handle = {
+      handler: null,
+      on: function(evt, cb) {
+        if (evt == "message") {
+          this.handler = cb;
+        }
+      }
+    };
+    
+    for (var i=0; i<topics.length; i++) {
+      var topic = topics[i];
+      if (!this.topics[topic]) {
+        this.topics[topic] = {
+          subscribers: []
+        };
+      }
+    
+      var t=this.topics[topic];
+      t.subscribers.push(handle);
+    }
+
+    cb(null, handle, topics.length);
+    return handle;
+  },
+
+  get: function(key, cb) {
+    cb(null, this.state[key]);
+    return this.state[key];
+  },
+
+  set: function(key, val, cb) {
+    this.state[key] = val;
+    cb();
+  },
+
+  del: function(key, cb) {
+    delete this.state[key];
+    cb(null);
+  },
+
+  sadd: function(key, skey, cb) {
+    if (!this.state[key]) this.state[key] = {};
+    this.state[key][skey] = true;
+    cb(null);
+  },
+
+  srem: function(key, skey, cb) {
+    if (this.state[key]) {
+      delete this.state[key][skey];
+    }
+    cb(null);
+  },
+
+  smembers: function(key, cb) {
+    cb(null, Object.keys(this.state[key]));
+  },
+
+  incr: function(key, cb) {
+    if (!this.state[key]) this.state[key] = 0;
+    this.state[key]++;
+    cb();
+  },
+
+  expire: function() {
+  },
+}
 
 module.exports = {
-  connectRedis(){
-    const redisHost = process.env.REDIS_PORT_6379_TCP_ADDR || 'localhost';
-    this.connection = new RedisConnection(6379, redisHost);
+  connectRedis: function() {
+    this.connection = notRedis;
   },
-  sendMessage(action, model, attributes, channelId) {
+  getConnection: function() {
+    this.connectRedis();
+    return this.connection;
+  },
+  sendMessage: function(action, model, attributes, channelId) {
     const data = JSON.stringify({
       channel_id: channelId,
       action: action,
@@ -17,12 +106,12 @@ module.exports = {
     });
     this.connection.publish('updates', data);
   },
-  logIp(ip, cb) {
+  logIp: function(ip, cb) {
     this.connection.incr("ip_"+ ip, (err, socketCounter) => {
       cb();
     });
   },
-  rateLimit(namespace, ip, cb) {
+  rateLimit: function(namespace, ip, cb) {
     const key = "limit_"+ namespace + "_"+ ip;
     const redis = this.connection;
 
@@ -47,7 +136,7 @@ module.exports = {
       }
     });
   }, 
-  isOnlineInSpace(user, space, cb) {
+  isOnlineInSpace: function(user, space, cb) {
     this.connection.smembers("space_" + space._id.toString(), function(err, list) {
       if (err) cb(err);
       else {
@@ -59,3 +148,6 @@ module.exports = {
     });
   }
 };
+
+return module.exports;
+

helpers/websockets.js

@@ -3,18 +3,19 @@ require('../models/schema');
 
 const WebSocketServer = require('ws').Server;
 
-const Redis = require('ioredis');
 const async = require('async');
 const _ = require("underscore");
 const mongoose = require("mongoose");
 const crypto = require('crypto');
 
+var redis = require("./redis.js");
+
 module.exports = {
-  startWebsockets: function(server){
+  startWebsockets: function(server) {
     this.setupSubscription();
-    this.state = new Redis(6379, process.env.REDIS_PORT_6379_TCP_ADDR || 'localhost');
-
-    if(!this.current_websockets){
+    this.state = redis.getConnection();
+    
+    if(!this.current_websockets) {
       this.current_websockets = [];
     }
 
@@ -117,8 +118,7 @@ module.exports = {
   },
 
   setupSubscription: function() {
-    this.cursorSubscriber = new Redis(6379, process.env.REDIS_PORT_6379_TCP_ADDR || 'localhost');
-    this.cursorSubscriber.subscribe(['cursors', 'users', 'updates'], function (err, count) {
+    this.cursorSubscriber = redis.getConnection().subscribe(['cursors', 'users', 'updates'], function (err, count) {
       console.log("[redis] websockets to " + count + " topics." );
     });
     this.cursorSubscriber.on('message', function (channel, rawMessage) {
@@ -206,7 +206,7 @@ module.exports = {
       console.log("websocket not found to remove");
     }
 
-    this.state.del(ws.id, function(err, res) {
+    this.state.del(ws.id+"", function(err, res) {
       if (err) console.error(err, res);
       else {
         this.removeUserInSpace(ws.space_id, ws, (err) => {
@@ -221,7 +221,8 @@ module.exports = {
   
   addUserInSpace: function(username, space, ws, cb) {
     console.log("[websockets] user "+username+" in "+space.access_mode +" space " +  space._id + " with socket "  +  ws.id);
-    this.state.set(ws.id,  username, function(err, res) {
+    
+    this.state.set(ws.id+"", username+"", function(err, res) {
       if(err) console.error(err, res);
       else {
         this.state.sadd("space_" + space._id, ws.id, function(err, res) {
@@ -238,7 +239,7 @@ module.exports = {
     }.bind(this));
   },
   removeUserInSpace: function(spaceId, ws, cb) {
-    this.state.srem("space_" + spaceId, ws.id, function(err, res) {
+    this.state.srem("space_" + spaceId, ws.id+"", function(err, res) {
       if (err) cb(err);
       else {
         console.log("[websockets] socket "+  ws.id + " went offline in space " + spaceId);