Memjs + Mongoose = Easy caching of counts

counts.js

var cache = require('memjs').Client.create();
var Location = require('models/Location');
var Report = require('models/Report');

cache.get('locationCount', function(err, value) {
  // memjs doesn't throw an error if the key doesn't exist.
  // but both err and value will be null.
  if (err === null && value === null) {
    Location.count( function(err, count) {
      // todo: handle errors
      cache.set('locationCount', count);
    });
  }
  res.locals.locationCount = value;
});

cache.get('reportCount', function(err, value) {
  // memjs doesn't throw an error if the key doesn't exist.
  // but both err and value will be null.
  if (err === null && value === null) {
    Report.count( function(err, count) {
      // todo: handle errors
      cache.set('reportCount', count);
    });
  }
  res.locals.reportCount = value;
});

Where this will live yet, I'm not entirely sure but I think it is the simplest thing to do.