node.js - Express logging with storing the request information -

background

yes, there lot of different node.js logging library winston, bunyan , console.log. it's easy log down information of specific request when has called , when , information in response.

the problem

the problem begins sub function calls. when under 1 request calling multiple functions uses same logging, how pass request meta - data these log calls (function parameters seems 1 possible way these messy) ?

example

small visual coders:

// middleware set request based information app.use(function (req, res, next) {   req.rid = 'random generated request id tracking sub queries'; });  app.get('/', function (req, rest) {    async.series({     'users': async.apply(db.users.find),     'posts': async.apply(db.posts.find),   }, function (err, dbres) {      console.log('api call made ', req.rid)      res.end(dbres);    });   });   // database functions in other file need track down request id in there (db.js)  module.exports = {    users: {       find: function () {          console.log('calling users listing ', req.rid); // error not possible access, not in scope           // make query , return result       }     },     posts: {       find: function () {          console.log('calling post listing ', req.rid); // error not possible access, not in scope           // make query , return result       }     }  }; 

you can log requests simple conf in app.js with;

app.use(function(req, res, next){   console.log('%s %s', req.method, req.url);   next(); }); 

however, need provide logs specific functions in controller.