papertrail_log.js

// INIT THE LOGGER 
// All environment and all projects logs to the same papertrail account (defined by its specific ACCOUNT_PORT).
// The papertrail paradigm is to log everything to the same container, and then use filters (aka searches) to
// containerize your logs on the fly. 

const winston = require('winston')
require('winston-papertrail').Papertrail

const ACCOUNT_PORT = 1234
const PROJECT = 'your-project-name'

const getLogger = (env) => {
	if (!env) {
		return {
			info: console.log,
			error: console.error
		}
	}
	else {
		const winstonPapertrail = new winston.transports.Papertrail({
			host: 'logs.papertrailapp.com',
			port: ACCOUNT_PORT,
			hostname: PROJECT,
			program: env
		})

		winstonPapertrail.on('error', console.error)

		const logger = new winston.Logger({ transports: [winstonPapertrail] })
		return logger
	}
}

const logIt = (transactionId, data, logFn) => {
	const transId = 
		data == undefined ? 'undefined' :
			transactionId && transactionId.__transactionId ? transactionId.__transactionId : transactionId
	const d = data !=undefined ? data : transactionId

	logFn(JSON.stringify({ transactionId: transId, data: d }))
}

let logger
const get = env => {
	if (!logger) {
		const _logger = getLogger(env)
		logger = {}
		logger.info = (transactionId, data) => logIt(transactionId, data, _logger.info)
		logger.error = (transactionId, data) => logIt(transactionId, data, _logger.error)
	}
	return logger
}

module.exports = { 'get': get }