Redis subscribe timeout - node.js

Question

How can i set timer function for Redis sub, so when client connect and message is not received from pubblisher in 200ms socket emit an event?
This is what i have now:
io.on('connection', function(socket){
const sub = redis.createClient();
sub.subscribe("data");
sub.on("message", function(channel, message) {
io.emit("data", JSON.parse(message));
});
sub.on("error", function(err){
console.log("Error" + err);
});
socket.on("disconnect", function(){
sub.removeListerner('message', function(){
io.emit("disconnected");
})
});
});

Answer 1

I know its a late question but hopefully this answer can help someone else or if you still havent found one. You can use a timeout function that calls a handler function just in case the message isnt received (im guessing that's what your asking)
I'm using redis as well and I do a call to other databases to check if they have the user with the requested id. To make sure the user doesn't stay and wait I added a timeout function which I set to 500ms. so its a race condition and whichever comes first I unsubscribe the redis client to make sure its a one off as well.
return User.mongoose.findAsync({ _id: params.id })
.then ( results => {
if (sails.IS.empty(results)) {
const request_id = Date.now() + '#' + sails.HOST_NAME + '/user/' + params.id
sails.REDIS_SUB.subscribe(request_id)
sails.REDIS_SUB.on('message', (channel, message) => {
if (channel == request_id) {
const data = JSON.parse(message)
sails.dlogwarn(params.id + '\t<=\t(' + data.responder + ')')
sails.REDIS_SUB.unsubscribe(request_id)
return data.params.results
}
})
sails.REDIS_PUB.publish('/user/find', JSON.stringify({
request_id: request_id,
params: {
_id: params.id
}
}))
setTimeout( () => {
sails.REDIS_SUB.unsubscribe(request_id)
return results
}, Number(process.env.REDIS_MAX_QUERY_TIMEOUT))
} else return results
})