Marc Mintel
5397309103
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104 lines
3.4 KiB
Plaintext
104 lines
3.4 KiB
Plaintext
Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
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const core = require('@sentry/core');
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const debugBuild = require('../debug-build.js');
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const instrument = require('./instrument.js');
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const utils = require('./utils.js');
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/**
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* Starts tracking the Largest Contentful Paint on the current page and collects the value once
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*
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* - the page visibility is hidden
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* - a navigation span is started (to stop LCP measurement for SPA soft navigations)
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*
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* Once either of these events triggers, the LCP value is sent as a standalone span and we stop
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* measuring LCP for subsequent routes.
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*/
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function trackLcpAsStandaloneSpan(client) {
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let standaloneLcpValue = 0;
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let standaloneLcpEntry;
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if (!utils.supportsWebVital('largest-contentful-paint')) {
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return;
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}
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const cleanupLcpHandler = instrument.addLcpInstrumentationHandler(({ metric }) => {
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const entry = metric.entries[metric.entries.length - 1] ;
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if (!entry) {
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return;
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}
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standaloneLcpValue = metric.value;
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standaloneLcpEntry = entry;
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}, true);
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utils.listenForWebVitalReportEvents(client, (reportEvent, pageloadSpanId) => {
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_sendStandaloneLcpSpan(standaloneLcpValue, standaloneLcpEntry, pageloadSpanId, reportEvent);
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cleanupLcpHandler();
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});
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}
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/**
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* Exported only for testing!
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*/
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function _sendStandaloneLcpSpan(
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lcpValue,
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entry,
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pageloadSpanId,
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reportEvent,
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) {
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debugBuild.DEBUG_BUILD && core.debug.log(`Sending LCP span (${lcpValue})`);
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const startTime = utils.msToSec((core.browserPerformanceTimeOrigin() || 0) + (entry?.startTime || 0));
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const routeName = core.getCurrentScope().getScopeData().transactionName;
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const name = entry ? core.htmlTreeAsString(entry.element) : 'Largest contentful paint';
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const attributes = {
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[core.SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN]: 'auto.http.browser.lcp',
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[core.SEMANTIC_ATTRIBUTE_SENTRY_OP]: 'ui.webvital.lcp',
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[core.SEMANTIC_ATTRIBUTE_EXCLUSIVE_TIME]: 0, // LCP is a point-in-time metric
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// attach the pageload span id to the LCP span so that we can link them in the UI
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'sentry.pageload.span_id': pageloadSpanId,
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// describes what triggered the web vital to be reported
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'sentry.report_event': reportEvent,
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};
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if (entry) {
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entry.element && (attributes['lcp.element'] = core.htmlTreeAsString(entry.element));
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entry.id && (attributes['lcp.id'] = entry.id);
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entry.url && (attributes['lcp.url'] = entry.url);
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// loadTime is the time of LCP that's related to receiving the LCP element response..
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entry.loadTime != null && (attributes['lcp.loadTime'] = entry.loadTime);
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// renderTime is loadTime + rendering time
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// it's 0 if the LCP element is loaded from a 3rd party origin that doesn't send the
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// `Timing-Allow-Origin` header.
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entry.renderTime != null && (attributes['lcp.renderTime'] = entry.renderTime);
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entry.size != null && (attributes['lcp.size'] = entry.size);
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}
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const span = utils.startStandaloneWebVitalSpan({
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name,
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transaction: routeName,
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attributes,
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startTime,
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});
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if (span) {
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span.addEvent('lcp', {
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[core.SEMANTIC_ATTRIBUTE_SENTRY_MEASUREMENT_UNIT]: 'millisecond',
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[core.SEMANTIC_ATTRIBUTE_SENTRY_MEASUREMENT_VALUE]: lcpValue,
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});
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// LCP is a point-in-time metric, so we end the span immediately
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span.end(startTime);
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}
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}
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exports._sendStandaloneLcpSpan = _sendStandaloneLcpSpan;
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exports.trackLcpAsStandaloneSpan = trackLcpAsStandaloneSpan;
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//# sourceMappingURL=lcp.js.map
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