Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
1 line
No EOL
47 KiB
Text
1 line
No EOL
47 KiB
Text
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Copyright 2023 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\nimport * as Handlers from './handlers/handlers.js';\nimport * as Helpers from './helpers/helpers.js';\nimport * as Insights from './insights/insights.js';\nimport * as Lantern from './lantern/lantern.js';\nimport * as LanternComputationData from './LanternComputationData.js';\nimport type * as Model from './ModelImpl.js';\nimport * as Types from './types/types.js';\n\nconst enum Status {\n IDLE = 'IDLE',\n PARSING = 'PARSING',\n FINISHED_PARSING = 'FINISHED_PARSING',\n ERRORED_WHILE_PARSING = 'ERRORED_WHILE_PARSING',\n}\n\nexport class TraceParseProgressEvent extends Event {\n static readonly eventName = 'traceparseprogress';\n constructor(public data: Model.TraceParseEventProgressData, init: EventInit = {bubbles: true}) {\n super(TraceParseProgressEvent.eventName, init);\n }\n}\n\n/**\n * Parsing a trace can take time. On large traces we see a breakdown of time like so:\n * - handleEvent() loop: ~20%\n * - finalize() loop: ~60%\n * - shallowClone calls: ~20%\n * The numbers below are set so we can report a progress percentage of [0...1]\n */\nconst enum ProgressPhase {\n HANDLE_EVENT = 0.2,\n FINALIZE = 0.8,\n CLONE = 1.0,\n}\nfunction calculateProgress(value: number, phase: ProgressPhase): number {\n // Finalize values should be [0.2...0.8]\n if (phase === ProgressPhase.FINALIZE) {\n return (value * (ProgressPhase.FINALIZE - ProgressPhase.HANDLE_EVENT)) + ProgressPhase.HANDLE_EVENT;\n }\n return value * phase;\n}\n\ndeclare global {\n interface HTMLElementEventMap {\n [TraceParseProgressEvent.eventName]: TraceParseProgressEvent;\n }\n}\n\nexport class TraceProcessor extends EventTarget {\n // We force the Meta handler to be enabled, so the TraceHandlers type here is\n // the model handlers the user passes in and the Meta handler.\n readonly #traceHandlers: Partial<Handlers.Types.Handlers>;\n #status = Status.IDLE;\n #modelConfiguration = Types.Configuration.defaults();\n #data: Handlers.Types.ParsedTrace|null = null;\n #insights: Insights.Types.TraceInsightSets|null = null;\n\n static createWithAllHandlers(): TraceProcessor {\n return new TraceProcessor(Handlers.ModelHandlers, Types.Configuration.defaults());\n }\n\n /**\n * This function is kept for testing with `stub`.\n */\n static getInsightRunners(): Insights.Types.InsightModelsType {\n return {...Insights.Models};\n }\n\n constructor(traceHandlers: Partial<Handlers.Types.Handlers>, modelConfiguration?: Types.Configuration.Configuration) {\n super();\n\n this.#verifyHandlers(traceHandlers);\n this.#traceHandlers = {\n Meta: Handlers.ModelHandlers.Meta,\n ...traceHandlers,\n };\n if (modelConfiguration) {\n this.#modelConfiguration = modelConfiguration;\n }\n this.#passConfigToHandlers();\n }\n\n #passConfigToHandlers(): void {\n for (const handler of Object.values(this.#traceHandlers)) {\n // Bit of an odd double check, but without this TypeScript refuses to let\n // you call the function as it thinks it might be undefined.\n if ('handleUserConfig' in handler && handler.handleUserConfig) {\n handler.handleUserConfig(this.#modelConfiguration);\n }\n }\n }\n\n /**\n * When the user passes in a set of handlers, we want to ensure that we have all\n * the required handlers. Handlers can depend on other handlers, so if the user\n * passes in FooHandler which depends on BarHandler, they must also pass in\n * BarHandler too. This method verifies that all dependencies are met, and\n * throws if not.\n **/\n #verifyHandlers(providedHandlers: Partial<Handlers.Types.Handlers>): void {\n // Tiny optimisation: if the amount of provided handlers matches the amount\n // of handlers in the Handlers.ModelHandlers object, that means that the\n // user has passed in every handler we have. So therefore they cannot have\n // missed any, and there is no need to iterate through the handlers and\n // check the dependencies.\n if (Object.keys(providedHandlers).length === Object.keys(Handlers.ModelHandlers).length) {\n return;\n }\n const requiredHandlerKeys = new Set<Handlers.Types.HandlerName>();\n for (const [handlerName, handler] of Object.entries(providedHandlers)) {\n requiredHandlerKeys.add(handlerName as Handlers.Types.HandlerName);\n const deps = 'deps' in handler ? handler.deps() : [];\n for (const depName of deps) {\n requiredHandlerKeys.add(depName);\n }\n }\n\n const providedHandlerKeys = new Set(Object.keys(providedHandlers));\n // We always force the Meta handler to be enabled when creating the\n // Processor, so if it is missing from the set the user gave us that is OK,\n // as we will have enabled it anyway.\n requiredHandlerKeys.delete('Meta');\n\n for (const requiredKey of requiredHandlerKeys) {\n if (!providedHandlerKeys.has(requiredKey)) {\n throw new Error(`Required handler ${requiredKey} not provided.`);\n }\n }\n }\n\n reset(): void {\n if (this.#status === Status.PARSING) {\n throw new Error('Trace processor can\\'t reset while parsing.');\n }\n\n const handlers = Object.values(this.#traceHandlers);\n for (const handler of handlers) {\n handler.reset();\n }\n\n this.#data = null;\n this.#insights = null;\n this.#status = Status.IDLE;\n }\n\n async parse(traceEvents: readonly Types.Events.Event[], options: Types.Configuration.ParseOptions): Promise<void> {\n if (this.#status !== Status.IDLE) {\n throw new Error(`Trace processor can't start parsing when not idle. Current state: ${this.#status}`);\n }\n\n options.logger?.start('total');\n try {\n this.#status = Status.PARSING;\n options.logger?.start('parse');\n await this.#computeParsedTrace(traceEvents, options);\n options.logger?.end('parse');\n if (this.#data && !options.isCPUProfile) { // We do not calculate insights for CPU Profiles.\n options.logger?.start('insights');\n this.#computeInsights(this.#data, traceEvents, options);\n options.logger?.end('insights');\n }\n this.#status = Status.FINISHED_PARSING;\n } catch (e) {\n this.#status = Status.ERRORED_WHILE_PARSING;\n throw e;\n } finally {\n options.logger?.end('total');\n }\n }\n\n /**\n * Run all the handlers and set the result to `#data`.\n */\n async #computeParsedTrace(traceEvents: readonly Types.Events.Event[], options: Types.Configuration.ParseOptions):\n Promise<void> {\n /**\n * We want to yield regularly to maintain responsiveness. If we yield too often, we're wasting idle time.\n * We could do this by checking `performance.now()` regularly, but it's an expensive call in such a hot loop.\n * `eventsPerChunk` is an approximated proxy metric.\n * But how big a chunk? We're aiming for long tasks that are no smaller than 100ms and not bigger than 200ms.\n * It's CPU dependent, so it should be calibrated on oldish hardware.\n * Illustration of a previous change to `eventsPerChunk`: https://imgur.com/wzp8BnR\n */\n const eventsPerChunk = 50_000;\n // Convert to array so that we are able to iterate all handlers multiple times.\n const sortedHandlers = [...sortHandlers(this.#traceHandlers).entries()];\n\n // Reset.\n for (const [, handler] of sortedHandlers) {\n handler.reset();\n }\n\n options.logger?.start('parse:handleEvent');\n\n // Handle each event.\n for (let i = 0; i < traceEvents.length; ++i) {\n // Every so often we take a break just to render.\n if (i % eventsPerChunk === 0 && i) {\n // Take the opportunity to provide status update events.\n const percent = calculateProgress(i / traceEvents.length, ProgressPhase.HANDLE_EVENT);\n this.dispatchEvent(new TraceParseProgressEvent({percent}));\n // TODO(paulirish): consider using `scheduler.yield()` or `scheduler.postTask(() => {}, {priority: 'user-blocking'})`\n await new Promise(resolve => setTimeout(resolve, 0));\n }\n const event = traceEvents[i];\n for (let j = 0; j < sortedHandlers.length; ++j) {\n const [, handler] = sortedHandlers[j];\n handler.handleEvent(event);\n }\n }\n\n options.logger?.end('parse:handleEvent');\n\n // Finalize.\n const finalizeOptions: Handlers.Types.FinalizeOptions = {\n ...options,\n allTraceEvents: traceEvents,\n };\n for (let i = 0; i < sortedHandlers.length; i++) {\n const [name, handler] = sortedHandlers[i];\n if (handler.finalize) {\n options.logger?.start(`parse:${name}:finalize`);\n // Yield to the UI because finalize() calls can be expensive\n // TODO(jacktfranklin): consider using `scheduler.yield()` or `scheduler.postTask(() => {}, {priority: 'user-blocking'})`\n await new Promise(resolve => setTimeout(resolve, 0));\n await handler.finalize(finalizeOptions);\n options.logger?.end(`parse:${name}:finalize`);\n }\n const percent = calculateProgress(i / sortedHandlers.length, ProgressPhase.FINALIZE);\n this.dispatchEvent(new TraceParseProgressEvent({percent}));\n }\n\n // Handlers that depend on other handlers do so via .data(), which used to always\n // return a shallow clone of its internal data structures. However, that pattern\n // easily results in egregious amounts of allocation. Now .data() does not do any\n // cloning, and it happens here instead so that users of the trace processor may\n // still assume that the parsed data is theirs.\n // See: crbug/41484172\n const shallowClone = (value: unknown, recurse = true): unknown => {\n if (value instanceof Map) {\n return new Map(value);\n }\n if (value instanceof Set) {\n return new Set(value);\n }\n if (Array.isArray(value)) {\n return [...value];\n }\n if (typeof value === 'object' && value && recurse) {\n const obj: Record<string, unknown> = {};\n for (const [key, v] of Object.entries(value)) {\n obj[key] = shallowClone(v, false);\n }\n return obj;\n }\n return value;\n };\n\n options.logger?.start('parse:clone');\n const parsedTrace = {};\n for (const [name, handler] of Object.entries(this.#traceHandlers)) {\n const data = shallowClone(handler.data());\n Object.assign(parsedTrace, {[name]: data});\n }\n options.logger?.end('parse:clone');\n\n this.dispatchEvent(new TraceParseProgressEvent({percent: ProgressPhase.CLONE}));\n\n this.#data = parsedTrace as Handlers.Types.ParsedTrace;\n }\n\n get parsedTrace(): Handlers.Types.ParsedTrace|null {\n if (this.#status !== Status.FINISHED_PARSING) {\n return null;\n }\n\n return this.#data;\n }\n\n get insights(): Insights.Types.TraceInsightSets|null {\n if (this.#status !== Status.FINISHED_PARSING) {\n return null;\n }\n\n return this.#insights;\n }\n\n #createLanternContext(\n parsedTrace: Handlers.Types.ParsedTrace, traceEvents: readonly Types.Events.Event[], frameId: string,\n navigationId: string, options: Types.Configuration.ParseOptions): Insights.Types.LanternContext|undefined {\n // Check for required handlers.\n if (!parsedTrace.NetworkRequests || !parsedTrace.Workers || !parsedTrace.PageLoadMetrics) {\n return;\n }\n if (!parsedTrace.NetworkRequests.byTime.length) {\n throw new Lantern.Core.LanternError('No network requests found in trace');\n }\n\n const navStarts = parsedTrace.Meta.navigationsByFrameId.get(frameId);\n const navStartIndex = navStarts?.findIndex(n => n.args.data?.navigationId === navigationId);\n if (!navStarts || navStartIndex === undefined || navStartIndex === -1) {\n throw new Lantern.Core.LanternError('Could not find navigation start');\n }\n\n const startTime = navStarts[navStartIndex].ts;\n const endTime = navStartIndex + 1 < navStarts.length ? navStarts[navStartIndex + 1].ts : Number.POSITIVE_INFINITY;\n const boundedTraceEvents = traceEvents.filter(e => e.ts >= startTime && e.ts < endTime);\n\n // Lantern.Types.TraceEvent and Types.Events.Event represent the same\n // object - a trace event - but one is more flexible than the other. It should be safe to cast between them.\n const trace: Lantern.Types.Trace = {\n traceEvents: boundedTraceEvents as unknown as Lantern.Types.TraceEvent[],\n };\n\n const requests = LanternComputationData.createNetworkRequests(trace, parsedTrace, startTime, endTime);\n const graph = LanternComputationData.createGraph(requests, trace, parsedTrace);\n const processedNavigation = LanternComputationData.createProcessedNavigation(parsedTrace, frameId, navigationId);\n\n const networkAnalysis = Lantern.Core.NetworkAnalyzer.analyze(requests);\n if (!networkAnalysis) {\n return;\n }\n\n const lanternSettings: Lantern.Types.Simulation.Settings = {\n // TODO(crbug.com/372674229): if devtools throttling was on, does this network analysis capture\n // that? Do we need to set 'devtools' throttlingMethod?\n networkAnalysis,\n throttlingMethod: 'provided',\n ...options.lanternSettings,\n };\n const simulator: Lantern.Simulation.Simulator<Types.Events.SyntheticNetworkRequest> =\n Lantern.Simulation.Simulator.createSimulator(lanternSettings);\n\n const computeData = {graph, simulator, processedNavigation};\n const fcpResult = Lantern.Metrics.FirstContentfulPaint.compute(computeData);\n const lcpResult = Lantern.Metrics.LargestContentfulPaint.compute(computeData, {fcpResult});\n const interactiveResult = Lantern.Metrics.Interactive.compute(computeData, {lcpResult});\n const tbtResult = Lantern.Metrics.TotalBlockingTime.compute(computeData, {fcpResult, interactiveResult});\n const metrics = {\n firstContentfulPaint: fcpResult,\n interactive: interactiveResult,\n largestContentfulPaint: lcpResult,\n totalBlockingTime: tbtResult,\n };\n\n return {requests, graph, simulator, metrics};\n }\n\n /**\n * Sort the insight models based on the impact of each insight's estimated savings, additionally weighted by the\n * worst metrics according to field data (if present).\n */\n sortInsightSet(insightSet: Insights.Types.InsightSet, metadata: Types.File.MetaData|null): void {\n // The initial order of the insights is alphabetical, based on `front_end/models/trace/insights/Models.ts`.\n // The order here provides a baseline that groups insights in a more logical way.\n const baselineOrder: Record<keyof Insights.Types.InsightModels, null> = {\n INPBreakdown: null,\n LCPBreakdown: null,\n LCPDiscovery: null,\n CLSCulprits: null,\n RenderBlocking: null,\n NetworkDependencyTree: null,\n ImageDelivery: null,\n DocumentLatency: null,\n FontDisplay: null,\n Viewport: null,\n DOMSize: null,\n ThirdParties: null,\n DuplicatedJavaScript: null,\n SlowCSSSelector: null,\n ForcedReflow: null,\n Cache: null,\n ModernHTTP: null,\n LegacyJavaScript: null,\n };\n\n // Determine the weights for each metric based on field data, utilizing the same scoring curve that Lighthouse uses.\n const weights = Insights.Common.calculateMetricWeightsForSorting(insightSet, metadata);\n\n // Normalize the estimated savings to a single number, weighted by its relative impact\n // to the page experience based on the same scoring curve that Lighthouse uses.\n const observedLcpMicro = Insights.Common.getLCP(insightSet)?.value;\n const observedLcp = observedLcpMicro ? Helpers.Timing.microToMilli(observedLcpMicro) : Types.Timing.Milli(0);\n const observedCls = Insights.Common.getCLS(insightSet).value;\n\n // INP is special - if users did not interact with the page, we'll have no INP, but we should still\n // be able to prioritize insights based on this metric. When we observe no interaction, instead use\n // a default value for the baseline INP.\n const observedInpMicro = Insights.Common.getINP(insightSet)?.value;\n const observedInp = observedInpMicro ? Helpers.Timing.microToMilli(observedInpMicro) : Types.Timing.Milli(200);\n\n const observedLcpScore =\n observedLcp !== undefined ? Insights.Common.evaluateLCPMetricScore(observedLcp) : undefined;\n const observedInpScore = Insights.Common.evaluateINPMetricScore(observedInp);\n const observedClsScore = Insights.Common.evaluateCLSMetricScore(observedCls);\n\n const insightToSortingRank = new Map<string, number>();\n for (const [name, model] of Object.entries(insightSet.model)) {\n const lcp = model.metricSavings?.LCP ?? 0;\n const inp = model.metricSavings?.INP ?? 0;\n const cls = model.metricSavings?.CLS ?? 0;\n\n const lcpPostSavings =\n observedLcp !== undefined ? Math.max(0, observedLcp - lcp) as Types.Timing.Milli : undefined;\n const inpPostSavings = Math.max(0, observedInp - inp) as Types.Timing.Milli;\n const clsPostSavings = Math.max(0, observedCls - cls);\n\n let score = 0;\n if (weights.lcp && lcp && observedLcpScore !== undefined && lcpPostSavings !== undefined) {\n score += weights.lcp * (Insights.Common.evaluateLCPMetricScore(lcpPostSavings) - observedLcpScore);\n }\n if (weights.inp && inp && observedInpScore !== undefined) {\n score += weights.inp * (Insights.Common.evaluateINPMetricScore(inpPostSavings) - observedInpScore);\n }\n if (weights.cls && cls && observedClsScore !== undefined) {\n score += weights.cls * (Insights.Common.evaluateCLSMetricScore(clsPostSavings) - observedClsScore);\n }\n\n insightToSortingRank.set(name, score);\n }\n\n // Now perform the actual sorting.\n const baselineOrderKeys = Object.keys(baselineOrder);\n const orderedKeys = Object.keys(insightSet.model);\n orderedKeys.sort((a, b) => {\n const a1 = baselineOrderKeys.indexOf(a);\n const b1 = baselineOrderKeys.indexOf(b);\n if (a1 >= 0 && b1 >= 0) {\n return a1 - b1;\n }\n if (a1 >= 0) {\n return -1;\n }\n if (b1 >= 0) {\n return 1;\n }\n return 0;\n });\n orderedKeys.sort((a, b) => (insightToSortingRank.get(b) ?? 0) - (insightToSortingRank.get(a) ?? 0));\n\n const newModel = {} as Insights.Types.InsightModels;\n for (const key of orderedKeys as Array<keyof Insights.Types.InsightModels>) {\n const model = insightSet.model[key];\n // @ts-expect-error Maybe someday typescript will be powerful enough to handle this.\n newModel[key] = model;\n }\n insightSet.model = newModel;\n }\n\n #computeInsightSet(\n parsedTrace: Handlers.Types.ParsedTrace, context: Insights.Types.InsightSetContext,\n options: Types.Configuration.ParseOptions): void {\n let id, urlString, navigation;\n if (context.navigation) {\n id = context.navigationId;\n urlString =\n parsedTrace.Meta.finalDisplayUrlByNavigationId.get(context.navigationId) ?? parsedTrace.Meta.mainFrameURL;\n navigation = context.navigation;\n } else {\n id = Types.Events.NO_NAVIGATION;\n urlString = parsedTrace.Meta.finalDisplayUrlByNavigationId.get('') ?? parsedTrace.Meta.mainFrameURL;\n }\n\n const insightSetModel = {} as Insights.Types.InsightSet['model'];\n\n for (const [name, insight] of Object.entries(TraceProcessor.getInsightRunners())) {\n let model: Insights.Types.InsightModel|Error;\n try {\n options.logger?.start(`insights:${name}`);\n model = insight.generateInsight(parsedTrace, context);\n model.frameId = context.frameId;\n const navId = context.navigation?.args.data?.navigationId;\n if (navId) {\n model.navigationId = navId;\n }\n model.createOverlays = () => {\n // @ts-expect-error: model is a union of all possible insight model types.\n return insight.createOverlays(model);\n };\n } catch (err) {\n model = err;\n } finally {\n options.logger?.end(`insights:${name}`);\n }\n Object.assign(insightSetModel, {[name]: model});\n }\n\n // We may choose to exclude the insightSet if it's trivial. Trivial means:\n // 1. There's no navigation (it's an initial trace period)\n // 2. The duration is short.\n // 3. All the insights are passing (aka no insights to show the user)\n // 4. It has no metrics to report (apart from a CLS of 0, which is default)\n // Generally, these cases are the short time ranges before a page reload starts.\n const isNavigation = id === Types.Events.NO_NAVIGATION;\n const trivialThreshold = Helpers.Timing.milliToMicro(Types.Timing.Milli(5000));\n const everyInsightPasses = Object.values(insightSetModel)\n .filter(model => !(model instanceof Error))\n .every(model => model.state === 'pass');\n\n const noLcp = !insightSetModel.LCPBreakdown.lcpEvent;\n const noInp = !insightSetModel.INPBreakdown.longestInteractionEvent;\n const noLayoutShifts = insightSetModel.CLSCulprits.shifts?.size === 0;\n const shouldExclude = isNavigation && context.bounds.range < trivialThreshold && everyInsightPasses && noLcp &&\n noInp && noLayoutShifts;\n if (shouldExclude) {\n return;\n }\n\n let url;\n try {\n url = new URL(urlString);\n } catch {\n // We're pretty sure this only happens for our test fixture: missing-url.json.gz. Shouldn't\n // happen for real traces.\n return;\n }\n\n const insightSet: Insights.Types.InsightSet = {\n id,\n url,\n navigation,\n frameId: context.frameId,\n bounds: context.bounds,\n model: insightSetModel,\n };\n if (!this.#insights) {\n this.#insights = new Map();\n }\n this.#insights.set(insightSet.id, insightSet);\n this.sortInsightSet(insightSet, options.metadata ?? null);\n }\n\n /**\n * Run all the insights and set the result to `#insights`.\n */\n #computeInsights(\n parsedTrace: Handlers.Types.ParsedTrace, traceEvents: readonly Types.Events.Event[],\n options: Types.Configuration.ParseOptions): void {\n // This insights map will be populated by the helper methods.\n this.#insights = new Map();\n\n // Filter main frame navigations to those that have the necessary data (frameId and navigationId).\n // TODO(cjamcl): Does this filtering makes the \"use the next nav as the end time\" logic potentially broken? Are navs without nav id or frame even real?\n const navigations = parsedTrace.Meta.mainFrameNavigations.filter(\n navigation => navigation.args.frame && navigation.args.data?.navigationId);\n\n this.#computeInsightsForInitialTracePeriod(parsedTrace, navigations, options);\n\n for (const [index, navigation] of navigations.entries()) {\n const min = navigation.ts;\n // Use trace end for the last navigation, otherwise use the start of the next navigation.\n const max = index + 1 < navigations.length ? navigations[index + 1].ts : parsedTrace.Meta.traceBounds.max;\n const bounds = Helpers.Timing.traceWindowFromMicroSeconds(min, max);\n this.#computeInsightsForNavigation(navigation, bounds, parsedTrace, traceEvents, options);\n }\n }\n\n /**\n * Computes insights for the period before the first navigation, or for the entire trace if no navigations exist.\n */\n #computeInsightsForInitialTracePeriod(\n parsedTrace: Handlers.Types.ParsedTrace, navigations: readonly Types.Events.NavigationStart[],\n options: Types.Configuration.ParseOptions): void {\n // Determine bounds: Use the period before the first navigation if navigations exist, otherwise use the entire trace bounds.\n const bounds = navigations.length > 0 ?\n Helpers.Timing.traceWindowFromMicroSeconds(parsedTrace.Meta.traceBounds.min, navigations[0].ts) :\n parsedTrace.Meta.traceBounds;\n\n const context: Insights.Types.InsightSetContext = {\n bounds,\n frameId: parsedTrace.Meta.mainFrameId,\n // No navigation or lantern context applies to this initial/no-navigation period.\n };\n this.#computeInsightSet(parsedTrace, context, options);\n }\n\n /**\n * Computes insights for a specific navigation event.\n */\n #computeInsightsForNavigation(\n navigation: Types.Events.NavigationStart, bounds: Types.Timing.TraceWindowMicro,\n parsedTrace: Handlers.Types.ParsedTrace, traceEvents: readonly Types.Events.Event[],\n options: Types.Configuration.ParseOptions): void {\n const frameId = navigation.args.frame;\n // Guaranteed by the filter in #computeInsights\n const navigationId = navigation.args.data?.navigationId as string;\n\n // The lantern sub-context is optional on InsightSetContext, so not setting it is OK.\n // This is also a hedge against an error inside Lantern resulting in breaking the entire performance panel.\n // Additionally, many trace fixtures are too old to be processed by Lantern.\n let lantern: Insights.Types.LanternContext|undefined;\n try {\n options.logger?.start('insights:createLanternContext');\n lantern = this.#createLanternContext(parsedTrace, traceEvents, frameId, navigationId, options);\n } catch (e) {\n // Handle Lantern errors gracefully\n // Don't allow an error in constructing the Lantern graphs to break the rest of the trace processor.\n // Log unexpected errors, but suppress anything that occurs from a trace being too old.\n // Otherwise tests using old fixtures become way too noisy.\n const expectedErrors = [\n 'mainDocumentRequest not found',\n 'missing metric scores for main frame',\n 'missing metric: FCP',\n 'missing metric: LCP',\n 'No network requests found in trace',\n 'Trace is too old',\n ];\n if (!(e instanceof Lantern.Core.LanternError)) {\n // If this wasn't a managed LanternError, the stack trace is likely needed for debugging.\n console.error(e);\n } else if (!expectedErrors.some(err => e.message === err)) {\n // To reduce noise from tests, only print errors that are not expected to occur because a trace is\n // too old (for which there is no single check).\n console.error(e);\n }\n } finally {\n options.logger?.end('insights:createLanternContext');\n }\n\n const context: Insights.Types.InsightSetContext = {\n bounds,\n frameId,\n navigation,\n navigationId,\n lantern,\n };\n this.#computeInsightSet(parsedTrace, context, options);\n }\n}\n\n/**\n * Some Handlers need data provided by others. Dependencies of a handler handler are\n * declared in the `deps` field.\n * @returns A map from trace event handler name to trace event handler whose entries\n * iterate in such a way that each handler is visited after its dependencies.\n */\nexport function sortHandlers(traceHandlers: Partial<Record<Handlers.Types.HandlerName, Handlers.Types.Handler>>):\n Map<Handlers.Types.HandlerName, Handlers.Types.Handler> {\n const sortedMap = new Map<Handlers.Types.HandlerName, Handlers.Types.Handler>();\n const visited = new Set<Handlers.Types.HandlerName>();\n const visitHandler = (handlerName: Handlers.Types.HandlerName): void => {\n if (sortedMap.has(handlerName)) {\n return;\n }\n if (visited.has(handlerName)) {\n let stackPath = '';\n for (const handler of visited) {\n if (stackPath || handler === handlerName) {\n stackPath += `${handler}->`;\n }\n }\n stackPath += handlerName;\n throw new Error(`Found dependency cycle in trace event handlers: ${stackPath}`);\n }\n visited.add(handlerName);\n const handler = traceHandlers[handlerName];\n if (!handler) {\n return;\n }\n const deps = handler.deps?.();\n if (deps) {\n deps.forEach(visitHandler);\n }\n sortedMap.set(handlerName, handler);\n };\n\n for (const handlerName of Object.keys(traceHandlers)) {\n visitHandler(handlerName as Handlers.Types.HandlerName);\n }\n return sortedMap;\n}\n"]} |