Flexible bunyan logger module

logger.js

/*
  npm install --save bunyan

  Basic usage:

  var logger = require('./logger')
  logger.info('hi')
  log.warn({lang: 'fr'}, 'au revoir')

  Create specific loggers for various parts of your app,
  allowing you to filter the log for just those entries:

  var logger = require('./logger').create('apiServer')
  logger.info('hi')
  log.warn({lang: 'fr'}, 'au revoir')

*/


var path = require('path')
var util = require('util')
var bunyan = require('bunyan')

var streams = []
var logfileTemplate = '../log/%s.log'
var nodeEnv = process.env.NODE_ENV || 'development'

function stdout(level) {
  streams.push({ level: level || 'info', stream: process.stdout })
}

function logfile(level) {
  var filename = util.format(logfileTemplate, nodeEnv)
  streams.push({ level: level || 'info', path: path.resolve(__dirname, filename) })
}

/*
  Configure environments here
  See https://github.com/trentm/node-bunyan#levels
*/

switch (nodeEnv) {
  case 'test':
    logfile('info')
    break
  case 'development':
    stdout('debug')
    break
  case 'staging':
    stdout('warn')
    break
  case 'production':
    stdout('error')
    break
}

function create(name) {
  return bunyan.createLogger({
    name: name,
    streams: streams,
    serializers: {
      req: bunyan.stdSerializers.req
    }
  })
}

var logger = create('default')

module.exports = logger
module.exports.create = create
module.exports.streams = streams