46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
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export function createNoopProfiler() {
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return {
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run(fn) {
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return Promise.resolve().then(() => fn());
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},
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collect() {
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return [];
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},
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};
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}
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export function createProfiler() {
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const events = [];
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return {
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collect() {
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return events;
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},
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run(fn, name, cat) {
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let startTime;
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return Promise.resolve()
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.then(() => {
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startTime = process.hrtime();
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})
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.then(() => fn())
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.then(value => {
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const duration = process.hrtime(startTime);
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// Trace Event Format documentation:
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// https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview
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const event = {
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name,
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cat,
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ph: 'X',
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ts: hrtimeToMicroseconds(startTime),
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pid: 1,
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tid: 0,
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dur: hrtimeToMicroseconds(duration),
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};
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events.push(event);
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return value;
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});
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},
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};
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}
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function hrtimeToMicroseconds(hrtime) {
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return (hrtime[0] * 1e9 + hrtime[1]) / 1000;
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}
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