NodeJS Connect/Express implementation

Question

Does anyone know how to implement the function chain used in connect/express. So one can do this..

var app = {}, app.stack = [];
app.use(function(r, s, n){
  // dosomething
})

require('http').createServer(function(r, s){
    // execute functions in app stack
})

You want to recreate the middleware stack of Connect/Express? If so: why? — robertklep, Jun 28 '13 at 15:52
Well, a good starting point would be [`connect/lib/proto.js`](https://github.com/senchalabs/connect/blob/master/lib/proto.js), where `use` and `handle` are implemented. — robertklep, Jun 28 '13 at 15:57
ok thx.. was expecting some secret to recursion.. not really.. — C B, Jun 28 '13 at 16:07

score 1 · Accepted Answer · answered Jun 28 '13 at 17:36

The middleware "chain" is actually just a "stack" which is actually a simple javascript Array of functions to execute in order. Whenever you call use, connect appends your function to the middleware stack. When it's time to run middleware, connect just executes all the functions in order with a bit of logic to pass the req, res, next parameters and wire up the next callback to mean continue processing the middleware stack. I agree with @robertklep that you should read the source code as it is quite readable and illuminating.

NodeJS Connect/Express implementation

1 Answers1