A hapi js distributed tracing plugin

hapi-tracing.js

const cls = require('cls-hooked');
const { v4: uuidV4 } = require('uuid');

// generate a unique value for namespace
const name = 'settle-context';
const nsId = `${name}:${uuidV4()}`;
const ns = cls.createNamespace(nsId);

const correlationIdKey = 'x-correlation-id';

const getCorrelationId = () => ns.get(correlationIdKey);

const register = async (server) => {

	server.ext('onRequest', (request, h) => {
	  const clsCtx = ns.createContext();
	  ns.enter(clsCtx);

	  const requestId = request.headers[correlationIdKey.toLowerCase()] || uuidV4();
	  console.log('xxxxx',requestId);
	  
	  ns.set(correlationIdKey, requestId);

	  return h.continue;
	});
}

const plugin = {
	name,
	once: true,
    register
};

export default {
	plugin,
	getCorrelationId
};