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Copyright 2022 The Chromium Authors. All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\n/**\n * This handler stores page load metrics, including web vitals,\n * and exports them in the shape of a map with the following shape:\n * Map(FrameId -> Map(navigationID -> metrics) )\n *\n * It also exports all markers in a trace in an array.\n *\n * Some metrics are taken directly from a page load events (AKA markers) like DCL.\n * Others require processing multiple events to be determined, like CLS and TBT.\n */\n\nimport * as Platform from '../../../core/platform/platform.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport * as Types from '../types/types.js';\n\nimport {data as metaHandlerData} from './MetaHandler.js';\nimport type {HandlerName} from './types.js';\n\n// Small helpers to make the below type easier to read.\ntype FrameId = string;\ntype NavigationId = string;\n/**\n * This represents the metric scores for all navigations, for all frames in a trace.\n * Given a frame id, the map points to another map from navigation id to metric scores.\n * The metric scores include the event related to the metric as well as the data regarding\n * the score itself.\n */\nconst metricScoresByFrameId = new Map>>();\n\n/**\n * Page load events with no associated duration that happened in the\n * main frame.\n */\nlet allMarkerEvents: Types.Events.PageLoadEvent[] = [];\n\nexport function reset(): void {\n metricScoresByFrameId.clear();\n pageLoadEventsArray = [];\n allMarkerEvents = [];\n selectedLCPCandidateEvents.clear();\n}\n\nlet pageLoadEventsArray: Types.Events.PageLoadEvent[] = [];\n\n// Once we've found the LCP events in the trace we want to fetch their DOM Node\n// from the backend. We could do this by parsing through our Map of frame =>\n// navigation => metric, but it's easier to keep a set of LCP events. As we\n// parse the trace, any time we store an LCP candidate as the potential LCP\n// event, we store the event here. If we later find a new candidate in the\n// trace, we store that and delete the prior event. When we've parsed the\n// entire trace this set will contain all the LCP events that were used - e.g.\n// the candidates that were the actual LCP events.\nconst selectedLCPCandidateEvents = new Set();\n\nexport function handleEvent(event: Types.Events.Event): void {\n if (!Types.Events.eventIsPageLoadEvent(event)) {\n return;\n }\n pageLoadEventsArray.push(event);\n}\n\nfunction storePageLoadMetricAgainstNavigationId(\n navigation: Types.Events.NavigationStart, event: Types.Events.PageLoadEvent): void {\n const navigationId = navigation.args.data?.navigationId;\n if (!navigationId) {\n throw new Error('Navigation event unexpectedly had no navigation ID.');\n }\n const frameId = getFrameIdForPageLoadEvent(event);\n const {rendererProcessesByFrame} = metaHandlerData();\n\n // If either of these pieces of data do not exist, the most likely\n // explanation is that the page load metric we found is for a frame/process\n // combo that the MetaHandler discarded. This typically happens if we get a\n // navigation event with an empty URL. Therefore, we will silently return and\n // drop this metric. If we didn't care about the navigation, we certainly do\n // not need to care about metrics for that navigation.\n const rendererProcessesInFrame = rendererProcessesByFrame.get(frameId);\n if (!rendererProcessesInFrame) {\n return;\n }\n const processData = rendererProcessesInFrame.get(event.pid);\n if (!processData) {\n return;\n }\n\n if (Types.Events.isNavigationStart(event)) {\n return;\n }\n\n if (Types.Events.isFirstContentfulPaint(event)) {\n const fcpTime = Types.Timing.Micro(event.ts - navigation.ts);\n const classification = scoreClassificationForFirstContentfulPaint(fcpTime);\n const metricScore = {event, metricName: MetricName.FCP, classification, navigation, timing: fcpTime};\n storeMetricScore(frameId, navigationId, metricScore);\n return;\n }\n\n if (Types.Events.isFirstPaint(event)) {\n const paintTime = Types.Timing.Micro(event.ts - navigation.ts);\n const classification = ScoreClassification.UNCLASSIFIED;\n const metricScore = {event, metricName: MetricName.FP, classification, navigation, timing: paintTime};\n storeMetricScore(frameId, navigationId, metricScore);\n return;\n }\n\n if (Types.Events.isMarkDOMContent(event)) {\n const dclTime = Types.Timing.Micro(event.ts - navigation.ts);\n const metricScore = {\n event,\n metricName: MetricName.DCL,\n classification: scoreClassificationForDOMContentLoaded(dclTime),\n navigation,\n timing: dclTime,\n };\n storeMetricScore(frameId, navigationId, metricScore);\n return;\n }\n\n if (Types.Events.isInteractiveTime(event)) {\n const ttiValue = Types.Timing.Micro(event.ts - navigation.ts);\n const tti = {\n event,\n metricName: MetricName.TTI,\n classification: scoreClassificationForTimeToInteractive(ttiValue),\n navigation,\n timing: ttiValue,\n };\n storeMetricScore(frameId, navigationId, tti);\n\n const tbtValue = Helpers.Timing.milliToMicro(Types.Timing.Milli(event.args.args.total_blocking_time_ms));\n const tbt = {\n event,\n metricName: MetricName.TBT,\n classification: scoreClassificationForTotalBlockingTime(tbtValue),\n navigation,\n timing: tbtValue,\n };\n storeMetricScore(frameId, navigationId, tbt);\n return;\n }\n\n if (Types.Events.isMarkLoad(event)) {\n const loadTime = Types.Timing.Micro(event.ts - navigation.ts);\n const metricScore = {\n event,\n metricName: MetricName.L,\n classification: ScoreClassification.UNCLASSIFIED,\n navigation,\n timing: loadTime,\n };\n storeMetricScore(frameId, navigationId, metricScore);\n return;\n }\n\n if (Types.Events.isLargestContentfulPaintCandidate(event)) {\n const candidateIndex = event.args.data?.candidateIndex;\n if (!candidateIndex) {\n throw new Error('Largest Contentful Paint unexpectedly had no candidateIndex.');\n }\n const lcpTime = Types.Timing.Micro(event.ts - navigation.ts);\n const lcp = {\n event,\n metricName: MetricName.LCP,\n classification: scoreClassificationForLargestContentfulPaint(lcpTime),\n navigation,\n timing: lcpTime,\n };\n const metricsByNavigation = Platform.MapUtilities.getWithDefault(metricScoresByFrameId, frameId, () => new Map());\n const metrics = Platform.MapUtilities.getWithDefault(metricsByNavigation, navigationId, () => new Map());\n const lastLCPCandidate = metrics.get(MetricName.LCP);\n if (lastLCPCandidate === undefined) {\n selectedLCPCandidateEvents.add(lcp.event);\n storeMetricScore(frameId, navigationId, lcp);\n return;\n }\n const lastLCPCandidateEvent = lastLCPCandidate.event;\n\n if (!Types.Events.isLargestContentfulPaintCandidate(lastLCPCandidateEvent)) {\n return;\n }\n const lastCandidateIndex = lastLCPCandidateEvent.args.data?.candidateIndex;\n if (!lastCandidateIndex) {\n // lastCandidateIndex cannot be undefined because we don't store candidates with\n // with an undefined candidateIndex value. This check is only to make TypeScript\n // treat the field as not undefined below.\n return;\n }\n if (lastCandidateIndex < candidateIndex) {\n selectedLCPCandidateEvents.delete(lastLCPCandidateEvent);\n selectedLCPCandidateEvents.add(lcp.event);\n storeMetricScore(frameId, navigationId, lcp);\n }\n return;\n }\n if (Types.Events.isLayoutShift(event)) {\n return;\n }\n return Platform.assertNever(event, `Unexpected event type: ${event}`);\n}\n\nfunction storeMetricScore(frameId: string, navigationId: string, metricScore: MetricScore): void {\n const metricsByNavigation = Platform.MapUtilities.getWithDefault(metricScoresByFrameId, frameId, () => new Map());\n const metrics = Platform.MapUtilities.getWithDefault(metricsByNavigation, navigationId, () => new Map());\n // If an entry with that metric name is present, delete it so that the new entry that\n // will replace it is added at the end of the map. This way we guarantee the map entries\n // are ordered in ASC manner by timestamp.\n metrics.delete(metricScore.metricName);\n metrics.set(metricScore.metricName, metricScore);\n}\n\nexport function getFrameIdForPageLoadEvent(event: Types.Events.PageLoadEvent): string {\n if (Types.Events.isFirstContentfulPaint(event) || Types.Events.isInteractiveTime(event) ||\n Types.Events.isLargestContentfulPaintCandidate(event) || Types.Events.isNavigationStart(event) ||\n Types.Events.isLayoutShift(event) || Types.Events.isFirstPaint(event)) {\n return event.args.frame;\n }\n if (Types.Events.isMarkDOMContent(event) || Types.Events.isMarkLoad(event)) {\n const frameId = event.args.data?.frame;\n if (!frameId) {\n throw new Error('MarkDOMContent unexpectedly had no frame ID.');\n }\n return frameId;\n }\n Platform.assertNever(event, `Unexpected event type: ${event}`);\n}\n\nfunction getNavigationForPageLoadEvent(event: Types.Events.PageLoadEvent): Types.Events.NavigationStart|null {\n if (Types.Events.isFirstContentfulPaint(event) || Types.Events.isLargestContentfulPaintCandidate(event) ||\n Types.Events.isFirstPaint(event)) {\n const navigationId = event.args.data?.navigationId;\n if (!navigationId) {\n throw new Error('Trace event unexpectedly had no navigation ID.');\n }\n const {navigationsByNavigationId} = metaHandlerData();\n const navigation = navigationsByNavigationId.get(navigationId);\n\n if (!navigation) {\n // This event's navigation has been filtered out by the meta handler as a noise event.\n return null;\n }\n return navigation;\n }\n\n if (Types.Events.isMarkDOMContent(event) || Types.Events.isInteractiveTime(event) ||\n Types.Events.isLayoutShift(event) || Types.Events.isMarkLoad(event)) {\n const frameId = getFrameIdForPageLoadEvent(event);\n const {navigationsByFrameId} = metaHandlerData();\n return Helpers.Trace.getNavigationForTraceEvent(event, frameId, navigationsByFrameId);\n }\n\n if (Types.Events.isNavigationStart(event)) {\n // We don't want to compute metrics of the navigation relative to itself, so we'll avoid avoid all that.\n return null;\n }\n\n return Platform.assertNever(event, `Unexpected event type: ${event}`);\n}\n\n/**\n * Classifications sourced from\n * https://web.dev/fcp/\n */\nexport function scoreClassificationForFirstContentfulPaint(fcpScoreInMicroseconds: Types.Timing.Micro):\n ScoreClassification {\n const FCP_GOOD_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(1.8));\n const FCP_MEDIUM_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(3.0));\n let scoreClassification = ScoreClassification.BAD;\n if (fcpScoreInMicroseconds <= FCP_MEDIUM_TIMING) {\n scoreClassification = ScoreClassification.OK;\n }\n if (fcpScoreInMicroseconds <= FCP_GOOD_TIMING) {\n scoreClassification = ScoreClassification.GOOD;\n }\n return scoreClassification;\n}\n\n/**\n * Classifications sourced from\n * https://web.dev/interactive/#how-lighthouse-determines-your-tti-score\n */\n\nexport function scoreClassificationForTimeToInteractive(ttiTimeInMicroseconds: Types.Timing.Micro):\n ScoreClassification {\n const TTI_GOOD_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(3.8));\n const TTI_MEDIUM_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(7.3));\n let scoreClassification = ScoreClassification.BAD;\n if (ttiTimeInMicroseconds <= TTI_MEDIUM_TIMING) {\n scoreClassification = ScoreClassification.OK;\n }\n if (ttiTimeInMicroseconds <= TTI_GOOD_TIMING) {\n scoreClassification = ScoreClassification.GOOD;\n }\n return scoreClassification;\n}\n\n/**\n * Classifications sourced from\n * https://web.dev/lcp/#what-is-lcp\n */\n\nexport function scoreClassificationForLargestContentfulPaint(lcpTimeInMicroseconds: Types.Timing.Micro):\n ScoreClassification {\n const LCP_GOOD_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(2.5));\n const LCP_MEDIUM_TIMING = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(4));\n let scoreClassification = ScoreClassification.BAD;\n if (lcpTimeInMicroseconds <= LCP_MEDIUM_TIMING) {\n scoreClassification = ScoreClassification.OK;\n }\n if (lcpTimeInMicroseconds <= LCP_GOOD_TIMING) {\n scoreClassification = ScoreClassification.GOOD;\n }\n return scoreClassification;\n}\n\n/**\n * DCL does not have a classification.\n */\nexport function scoreClassificationForDOMContentLoaded(_dclTimeInMicroseconds: Types.Timing.Micro):\n ScoreClassification {\n return ScoreClassification.UNCLASSIFIED;\n}\n\n/**\n * Classifications sourced from\n * https://web.dev/lighthouse-total-blocking-#time/\n */\n\nexport function scoreClassificationForTotalBlockingTime(tbtTimeInMicroseconds: Types.Timing.Micro):\n ScoreClassification {\n const TBT_GOOD_TIMING = Helpers.Timing.milliToMicro(Types.Timing.Milli(200));\n const TBT_MEDIUM_TIMING = Helpers.Timing.milliToMicro(Types.Timing.Milli(600));\n let scoreClassification = ScoreClassification.BAD;\n if (tbtTimeInMicroseconds <= TBT_MEDIUM_TIMING) {\n scoreClassification = ScoreClassification.OK;\n }\n if (tbtTimeInMicroseconds <= TBT_GOOD_TIMING) {\n scoreClassification = ScoreClassification.GOOD;\n }\n return scoreClassification;\n}\n\n/**\n * Gets all the Largest Contentful Paint scores of all the frames in the\n * trace.\n */\nfunction gatherFinalLCPEvents(): Types.Events.PageLoadEvent[] {\n const allFinalLCPEvents: Types.Events.PageLoadEvent[] = [];\n const dataForAllFrames = [...metricScoresByFrameId.values()];\n const dataForAllNavigations = dataForAllFrames.flatMap(frameData => [...frameData.values()]);\n for (let i = 0; i < dataForAllNavigations.length; i++) {\n const navigationData = dataForAllNavigations[i];\n const lcpInNavigation = navigationData.get(MetricName.LCP);\n if (!lcpInNavigation?.event) {\n continue;\n }\n\n allFinalLCPEvents.push(lcpInNavigation.event);\n }\n return allFinalLCPEvents;\n}\n\nexport async function finalize(): Promise {\n pageLoadEventsArray.sort((a, b) => a.ts - b.ts);\n\n for (const pageLoadEvent of pageLoadEventsArray) {\n const navigation = getNavigationForPageLoadEvent(pageLoadEvent);\n if (navigation) {\n // Event's navigation was not filtered out as noise.\n storePageLoadMetricAgainstNavigationId(navigation, pageLoadEvent);\n }\n }\n // NOTE: if you are looking for the TBT calculation, it has temporarily been\n // removed. See crbug.com/1424335 for details.\n const allFinalLCPEvents = gatherFinalLCPEvents();\n const mainFrame = metaHandlerData().mainFrameId;\n // Filter out LCP candidates to use only definitive LCP values\n const allEventsButLCP = pageLoadEventsArray.filter(event => !Types.Events.isLargestContentfulPaintCandidate(event));\n const markerEvents = [...allFinalLCPEvents, ...allEventsButLCP].filter(Types.Events.isMarkerEvent);\n // Filter by main frame and sort.\n allMarkerEvents =\n markerEvents.filter(event => getFrameIdForPageLoadEvent(event) === mainFrame).sort((a, b) => a.ts - b.ts);\n}\n\nexport interface PageLoadMetricsData {\n /**\n * This represents the metric scores for all navigations, for all frames in a trace.\n * Given a frame id, the map points to another map from navigation id to metric scores.\n * The metric scores include the event related to the metric as well as the data regarding\n * the score itself.\n */\n metricScoresByFrameId: Map>>;\n /**\n * Page load events with no associated duration that happened in the\n * main frame.\n */\n allMarkerEvents: Types.Events.PageLoadEvent[];\n}\n\nexport function data(): PageLoadMetricsData {\n return {\n metricScoresByFrameId,\n allMarkerEvents,\n };\n}\n\nexport function deps(): HandlerName[] {\n return ['Meta'];\n}\n\nexport const enum ScoreClassification {\n GOOD = 'good',\n OK = 'ok',\n BAD = 'bad',\n // Some metrics (such as DOMContentLoaded) don't have a Good/OK/Bad classification, hence this additional entry.\n UNCLASSIFIED = 'unclassified',\n}\n\nexport const enum MetricName {\n // First Contentful Paint\n FCP = 'FCP',\n // First Paint\n FP = 'FP',\n // MarkLoad\n L = 'L',\n LCP = 'LCP',\n // Mark DOM Content\n DCL = 'DCL',\n // Time To Interactive\n TTI = 'TTI',\n // Total Blocking Time\n TBT = 'TBT',\n // Cumulative Layout Shift\n CLS = 'CLS',\n // Navigation\n NAV = 'Nav',\n // Note: INP is handled in UserInteractionsHandler\n}\n\nexport interface MetricScore {\n metricName: MetricName;\n classification: ScoreClassification;\n event?: Types.Events.PageLoadEvent;\n // The last navigation that occurred before this metric score.\n navigation?: Types.Events.NavigationStart;\n estimated?: boolean;\n timing: Types.Timing.Micro;\n}\n\nexport type LCPMetricScore = MetricScore&{\n event: Types.Events.LargestContentfulPaintCandidate,\n metricName: MetricName.LCP,\n};\n\nexport function metricIsLCP(metric: MetricScore): metric is LCPMetricScore {\n return metric.metricName === MetricName.LCP;\n}\n"]}