Logging with CLS
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const express = require('express'); | |
const pino = require('pino'); | |
const cuid = require('cuid'); | |
const { createNamespace, getNamespace } = require('cls-hooked'); | |
const logger = pino(); | |
const loggerNamespace = createNamespace('logger'); | |
const app = express(); | |
function clsRequestId(namespace, generateId) { | |
return (req, res, next) => { | |
const requestId = req.get('X-Request-Id') || generateId(); | |
res.set('X-Request-Id', requestId); | |
namespace.run(() => { | |
namespace.set('requestId', requestId); | |
next(); | |
}) | |
} | |
} | |
app.use(clsRequestId(loggerNamespace, cuid)); | |
app.get('/', async (req, res) => { | |
const result = await handler(); | |
return res.json(result); | |
}) | |
app.listen(4004, () => { | |
logger.info( | |
{ endpoint: `http://localhost:4000` }, | |
'App is running!' | |
) | |
}) | |
function delay(timeoutMs) { | |
return new Promise(resolve => { | |
setTimeout(() => { | |
resolve() | |
}, timeoutMs); | |
}) | |
} | |
function randomInteger(min, max) { | |
return Math.floor(Math.random() * (max - min + 1)) + min; | |
} | |
async function handler() { | |
const namespace = getNamespace('logger'); | |
logger.info({ requestId: namespace.get('requestId') }, 'Before') | |
await delay(randomInteger(1000, 10000)); | |
logger.info({ requestId: namespace.get('requestId') }, 'Middle') | |
await delay(randomInteger(1000, 10000)); | |
logger.info({ requestId: namespace.get('requestId') }, 'After') | |
return {}; | |
} |
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