Node.js: using socket.io with cluster

Question

i want to use socket.io with cluster . This is what i tried but i got this error :

TypeError: RedisStore is not a constructor

const app = express()
const redis = require('redis')
var cluster = require('cluster'),
numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
//master process - fork children
for (var i = 0; i < numCPUs; i++) {
    cluster.fork()
}
}
else {
var RedisStore = require('redis')
    , pub = redis.createClient()
    , sub = redis.createClient()
    , client = redis.createClient();

var io = require('socket.io').listen(5000, {
    'store': new RedisStore({
        redisPub: pub
        , redisSub: sub
        , redisClient: client
    }),
});
io.sockets.on('connection', function (socket) {
    // all socket.on('eventname'... things go here
});
const http = require('http')
http.createServer(app).listen(4000);
}

Leibale Eidelman · Accepted Answer · 2020-12-24 20:15:16Z

2

RedisStore is a functionality added by the connect-redis module, not redis. to fix that you just need to change var RedisStore = require('redis') to var RedisStore = require('connect-redis').

RedisStore constructor expects to get an object with the redis property, and it should be a redis client (connect-redis API Docs).

answered Dec 24, 2020 at 20:15

Leibale Eidelman

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2 Comments

soroush asamiesfahan Over a year ago

Thanks and does it need to install redis database ?

Leibale Eidelman Over a year ago

@soroushasamiesfahan the redis module is a client to work with a Redis database/server

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