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aigoncharov/nodejs-logging-made-right-1.js

Created February 28, 2019 20:54
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nodejs-logging-made-right-1.js
const cls = require('cls-hooked')
const uuidv4 = require('uuid/v4')
const clsNamespace = cls.createNamespace('app')
const clsMiddleware = (req, res, next) => {
// req and res are event emitters. We want to access CLS context inside of their event callbacks
clsNamespace.bind(req)
clsNamespace.bind(res)
const traceID = uuidv4()
clsNamespace.run(() => {
clsNamespace.set('traceID', traceID)
next()
})
}
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