code: function get(req) {
          var cache = caches[this.name];
          var returnVal = null;
  
          if (cache && !redisOffline) {
              try {
                  returnVal = cache.get(req.key);
              }
              catch (err) {
                  console.log('redis get err: ' + err);
              }
          }
  
          return new Q(returnVal);
      }
docs: Get a value from cache
  @param req