express-middleware

[Couto]

One use case that seems to become a pattern in expressjs applications is to measure the interval between receiving and responding to a request.

This pattern can be abstracted with a simple middleware function similar to:

function timer(start = new Date()) {
  return (end = new Date()) => (end - start);
}

module.exports = (client) => (req, res, next) => {
  req.__timer = timer();
  res.on('finish', () => client.timer('response_time', req.__timer()));
  next();
};

And could be used in a similar manner to:

const Statful = require('statful');
const statfulMiddleware = require('statful/middleware')
const statfulClient = new Statful(/*config*/);
const app = express();

app.use(statfulMiddlware(statfulClient))

I can start a PR with this, but I was wondering if it's desirable to add this directly to the statful client, or if it should be in a separate project.

[miguelcnf]

Yes this makes a lot of sense. I'd prefer we do it as a standalone repo with a dependency on the client.

I've just invited you to the team, feel free to create a new statful-middleware-express repo.

I appreciate this.