fetch-dht/lib/log/index.js

const uuid = require('uuid');

module.exports = {};

const log = ({ time, ...args }) => {
  console.log(
    JSON.stringify({ time: new Date().toISOString(), ...args }),
  );
};

const traced = (requestId) => ({ requestId: _, ...args }) =>
  log({ requestId, ...args });

const middleware = (req, res, next) => {
  // generate (or use existing) requestId
  req.requestId = req.requestId || uuid.v4();
  // set a tracing logger use elsewhere
  req.log = traced(req.requestId);
  req.log({ status: 'new' });
  next();
};

module.exports = { log, traced, middleware };