Laravel Echo 和 Laravel Echo 服务器和套接字：区分服务器端的加入和离开事件

Question

I am building a web service for a mobile application. I need to know which mobile users are online. I implemented this by Laravel echo- laravel echo server-socket io and redis. Every thing works and by presence channel the client listens to the events.

The problem is, the leave and join events are on client side, while when a user leaves the channel, I need to remove it from a list stored in Redis, In fact I need to know that which of the join or leave occurs in server side not client side in order to be able to update the online users in Redis.

How can I do this?

My solutions

Solution 1

If there is any implementation of here method in server side which returns the online users, it may work, in fact I can compare the my list with here to get the latest update.

Solution 2

When an event happens for a user, if that user already exists in my list in the Redis, clearly it is a leave event, because users can be online exactly once at any moment, and if the user doesn't exist in the list, so it must be a join, because no one can join if it is already on the list.

Thanks in advance.

Answer 1

You should be using Presence Channels for this functionality.

Watch this Laracast Episode 8 video, you can adapt the examples there with your offline user list.

I suggest pushing the user.id of an online user into an participants array list using channel here , joining , leaving hooks as the video demonstrates.

When outputting your full list of users , you could check if they are online using includes .

const participants = [4, 34, 57, 70]

for (user of users) {

  if( participants.includes(user.id) ) {
   // The user is online, Set an online style or something
  }

}