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pragyandas/index.js

Created June 20, 2020 15:03
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Promise performance using async and performance hooks
Raw
index.js
'use strict';
const async_hooks = require('async_hooks');
const {
performance,
PerformanceObserver
} = require('perf_hooks');
const set = new Set();
const hook = async_hooks.createHook({
init(id, type, triggerAsyncId, resource) {
if (type === 'PROMISE') {
performance.mark(`${id}-Init`);
set.add(id);
}
},
promiseResolve(id) {
if (set.has(id)) {
set.delete(id);
performance.mark(`${id}-Resolved`);
performance.measure(`Entry-${id}`,
`${id}-Init`,
`${id}-Resolved`);
}
}
});
hook.enable();
const obs = new PerformanceObserver((list, observer) => {
console.log(list.getEntries());
});
obs.observe({ entryTypes: ['measure'], buffered: true });
async function execTimeout () {
const msg = await timesup();
return msg;
};
function timesup () {
return new Promise ((resolve) => {
setTimeout(() => {resolve('Hello');}, 1000);
});
}
execTimeout();
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