express-limiter Having a function for lookup seems to only work for the first request

I "consoled" the block about the lookup option being a function:

    if (typeof(opts.lookup) === 'function') {
      console.log('1:' + opts.lookup);
      middleware = function (middleware, req, res, next) {
        console.log('2:' + opts.lookup);
        return opts.lookup(req, res, opts, function () {
          console.log('3:' + opts.lookup);
          return middleware(req, res, next)
        })
      }.bind(this, middleware)
    }

Then I booted the server:

Tue Sep 29 2015 12:38:06 GMT-0400 (EDT): 1:function (req, res, opts, next) {
      if (req.body && req.body.uuid) {
        opts.lookup = ['body.uuid', 'params.uid'];
      } else {
        opts.lookup = ['connection.remoteAddress', 'params.uid'];
        opts.total = 100;
      }
      return next();
    }

Then I ran the first request:

2:function (req, res, opts, next) {
      if (req.body && req.body.uuid) {
        opts.lookup = ['body.uuid', 'params.uid'];
      } else {
        opts.lookup = ['connection.remoteAddress', 'params.uid'];
        opts.total = 100;
      }
      return next();
    } 
3:connection.remoteAddress,params.uid

Then I ran the second request:

2:connection.remoteAddress,params.uid 
Tue Sep 29 2015 12:38:23 GMT-0400 (EDT): TypeError: Property 'lookup' of object #<Object> is not a function

Notice the second go console log 2 has been updated to what was console log 3's.

Sep 29 '15 16:09 kentmw

I had to write a work around in my code:

 var limiterCreator = require('express-limiter')(app, client);
  function recreateLimiter(opts) {
    return function() {
      var limiter = limiterCreator(_.extend({}, opts));
      return limiter.apply(this, arguments);
    }
  }

Maybe I'm missing something really obvious but the fact that the limiter only gets created once and the original opts object is modified on subsequent calls seems like bad news. Perhaps cloning the opts at the beginning using underscore could mitigate this problem.

Sep 29 '15 17:09 kentmw

i gotcha. i'll have a look to see what we can do about that