Ember.js: make current user globally accessible

I am writing an ember app (using ember 2.3.0) using emberfire & torii for authentication. After a user logs in, their uid is available to me in the torii session object. I also have a user model and would like to access other data related to the current user in my templates, routes, etc.

I can get this to work in a single route by doing something like:

let uid = this.get('session').get('uid');
this.store.findRecord('user', uid).then(user => {
  console.log(user.get('firstName'));
});

but would like to prevent having to write this for each route/controller that needs to access it.

Could anyone advise on the best way to do this? Is the best way to use a service? If so, how can I ensure that the code in my service is executed after my session object is available?