Add visitors to UsersSessions

[lmachens]

Usecase: Publish the number of visitors.

Example:

// percolatestudio/publish-counts
const countVisitors = new Counter('visitors', UsersSessions.find({visitor: true}));

Meteor.publish('visitors', function() {
  return countVisitors;
});

Visitors (without userId) are identified by their connection.id.

[lmachens]

@rodrigok any feedback?

[sampaiodiego]

I'm sorry for the very late response.

Just so you know, I've changed the API to support visitors.. Now on the client side we're doing like this to track a visitor's connection: https://github.com/RocketChat/Rocket.Chat/blob/develop/packages/rocketchat-livechat/.app/imports/client/visitor.js#L163

And on the server side we have this callback to receive status changes and update according collections: https://github.com/RocketChat/Rocket.Chat/blob/develop/packages/rocketchat-livechat/server/visitorStatus.js#L3

[lmachens]

I am not sure how your solution works.
We have a online users and visitors count and use UsersSessions.find({ visitor: true }).count() which is a very simple solution.
How can I get the number of visitors with the metadata callback?