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import { now, isObject } from '../utils/helper';
interface PerformancePluginConfig {
sampleRate?: number;
captureLongTasks?: boolean;
captureResources?: boolean;
resourceSampleRate?: number;
longTaskSampleRate?: number;
captureNavigation?: boolean;
captureFP?: boolean;
enablePageLoadTracing?: boolean; // 是否启用 Page Load Transaction
maxResourceSpans?: number; // 最大 Resource Span 数量
}
interface VitalMeasurement {
value: number;
unit?: string;
rating?: 'good' | 'needs-improvement' | 'poor';
}
class PerformancePlugin implements LightPlugin {
name = 'performance';
version = '2.0.0';
private client!: LightClient;
private config: PerformancePluginConfig = {
sampleRate: 0.1,
captureLongTasks: true,
captureResources: false,
resourceSampleRate: 0.01,
longTaskSampleRate: 0.05,
captureNavigation: true,
captureFP: true,
enablePageLoadTracing: false,
maxResourceSpans: 50,
};
private observers: PerformanceObserver[] = [];
private onLoad?: () => void;
private navLoadTimer: ReturnType<typeof setTimeout> | null = null;
private totalBlockingTime: number = 0;
private fcpTime: number | null = null;
private lastLongTaskEndTime: number = 0;
private ttiReported: boolean = false;
private ttiTimer: ReturnType<typeof setTimeout> | null = null;
private pageLoadTransaction: Transaction | null = null;
private measurements: Record<string, VitalMeasurement> = {};
private resourceSpanCount: number = 0;
setup(client: LightClient): void {
this.client = client;
this.loadConfig();
if (this.config.enablePageLoadTracing) {
this.startPageLoadTransaction();
}
this.observeWebVitals();
this.observeLongTasks();
this.observeNavigation();
this.observeResources();
}
private startPageLoadTransaction(): void {
if (typeof window === 'undefined') return;
const pageUrl = typeof location !== 'undefined' ? location.pathname : '/';
const navStart = typeof performance !== 'undefined' && performance.timing?.navigationStart
? performance.timing.navigationStart
: now();
this.pageLoadTransaction = this.client.startTransaction({
name: pageUrl,
op: 'pageload',
description: `Page load - ${pageUrl}`,
startTimestamp: navStart,
type: 'pageload',
tags: {
'page.url': pageUrl,
},
});
}
private loadConfig(): void {
const clientConfig = this.client.config as LightConfig;
if (clientConfig && isObject(clientConfig.performance)) {
this.config = { ...this.config, ...(clientConfig.performance as object) };
}
}
private shouldSample(type: 'default' | 'resource' | 'longtask' | 'vitals' = 'default'): boolean {
let rate = this.config.sampleRate ?? 0.1;
if (type === 'resource') {
rate = this.config.resourceSampleRate ?? 0.01;
} else if (type === 'longtask') {
rate = this.config.longTaskSampleRate ?? 0.05;
} else if (type === 'vitals') {
rate = 1;
}
if (rate >= 1) return true;
if (rate <= 0) return false;
return Math.random() < rate;
}
private observeWebVitals(): void {
if (typeof PerformanceObserver === 'undefined') return;
this.observePaint();
this.observeLCP();
this.observeFID();
this.observeCLS();
this.observeTTFB();
}
private observePaint(): void {
try {
const po = new PerformanceObserver((entryList) => {
const fpEntries = entryList.getEntriesByName('first-paint');
if (fpEntries.length > 0 && this.config.captureFP) {
this.reportMetric('FP', fpEntries[0].startTime, 'ms', {}, 'vitals');
}
const fcpEntries = entryList.getEntriesByName('first-contentful-paint');
if (fcpEntries.length > 0) {
this.fcpTime = fcpEntries[0].startTime;
this.lastLongTaskEndTime = fcpEntries[0].startTime;
this.reportMetric('FCP', fcpEntries[0].startTime, 'ms', {}, 'vitals');
this.scheduleTTI();
}
});
po.observe({ type: 'paint', buffered: true });
this.observers.push(po);
} catch {
// Paint observer not supported
}
}
private observeLCP(): void {
try {
const po = new PerformanceObserver((entryList) => {
const entries = entryList.getEntries();
const lastEntry = entries[entries.length - 1] as PerformanceEntry & { renderTime?: number; loadTime?: number };
if (lastEntry) {
const value = lastEntry.renderTime || lastEntry.loadTime || lastEntry.startTime;
this.reportMetric('LCP', value, 'ms', {}, 'vitals');
}
});
po.observe({ type: 'largest-contentful-paint', buffered: true });
this.observers.push(po);
} catch {
// LCP not supported
}
}
private observeFID(): void {
try {
const po = new PerformanceObserver((entryList) => {
const entries = entryList.getEntries() as PerformanceEventTiming[];
if (entries.length > 0) {
const firstEntry = entries[0];
const value = firstEntry.processingStart - firstEntry.startTime;
this.reportMetric('FID', value, 'ms', {}, 'vitals');
}
});
po.observe({ type: 'first-input', buffered: true });
this.observers.push(po);
} catch {
// FID not supported
}
}
private observeCLS(): void {
try {
let clsValue = 0;
let sessionValue = 0;
let sessionEntries: PerformanceEntry[] = [];
const po = new PerformanceObserver((entryList) => {
const entries = entryList.getEntries() as unknown as { hadRecentInput?: boolean; value?: number; startTime: number; endTime?: number }[];
for (const entry of entries) {
if (!entry.hadRecentInput) {
const firstSessionEntry = sessionEntries[0];
const lastSessionEntry = sessionEntries[sessionEntries.length - 1];
if (
sessionValue &&
entry.startTime - (lastSessionEntry?.duration || 0) < 1000 &&
entry.startTime - firstSessionEntry.startTime < 5000
) {
sessionValue += entry.value || 0;
sessionEntries.push(entry as unknown as PerformanceEntry);
} else {
sessionValue = entry.value || 0;
sessionEntries = [entry as unknown as PerformanceEntry];
}
if (sessionValue > clsValue) {
clsValue = sessionValue;
this.reportMetric('CLS', clsValue, '', {}, 'vitals');
}
}
}
});
po.observe({ type: 'layout-shift', buffered: true });
this.observers.push(po);
} catch {
// CLS not supported
}
}
private observeTTFB(): void {
try {
const po = new PerformanceObserver((entryList) => {
const navEntries = entryList.getEntriesByType('navigation') as PerformanceNavigationTiming[];
if (navEntries.length > 0) {
const navEntry = navEntries[0];
const ttfb = navEntry.responseStart - navEntry.requestStart;
this.reportMetric('TTFB', Math.max(0, ttfb), 'ms', {}, 'vitals');
}
});
po.observe({ type: 'navigation', buffered: true });
this.observers.push(po);
} catch {
// Navigation timing not supported
}
}
private observeLongTasks(): void {
if (!this.config.captureLongTasks) return;
try {
const po = new PerformanceObserver((entryList) => {
const entries = entryList.getEntries();
for (const entry of entries) {
const endTime = entry.startTime + entry.duration;
if (endTime > this.lastLongTaskEndTime) {
this.lastLongTaskEndTime = endTime;
}
if (this.fcpTime !== null && entry.startTime >= this.fcpTime) {
const blockingTime = entry.duration - 50;
if (blockingTime > 0) {
this.totalBlockingTime += blockingTime;
}
}
this.reportMetric('longtask', entry.duration, 'ms', {}, 'longtask');
this.scheduleTTI();
}
});
po.observe({ type: 'longtask', buffered: true });
this.observers.push(po);
} catch {
// Long tasks not supported
}
}
private scheduleTTI(): void {
if (this.ttiReported) return;
if (this.ttiTimer) {
clearTimeout(this.ttiTimer);
}
this.ttiTimer = setTimeout(() => {
if (this.ttiReported) return;
this.ttiReported = true;
const tti = Math.max(this.lastLongTaskEndTime, this.fcpTime || 0);
this.reportMetric('TTI', tti, 'ms', {}, 'vitals');
this.reportMetric('TBT', this.totalBlockingTime, 'ms', {}, 'vitals');
}, 5000);
}
private observeNavigation(): void {
if (!this.config.captureNavigation) return;
if (typeof performance === 'undefined') return;
this.onLoad = () => {
this.navLoadTimer = setTimeout(() => {
const timing = performance.timing;
if (!timing) return;
const navigationStart = timing.navigationStart;
const metrics: Record<string, number> = {
dom_ready: timing.domContentLoadedEventEnd - navigationStart,
load_time: timing.loadEventEnd - navigationStart,
dns: timing.domainLookupEnd - timing.domainLookupStart,
tcp: timing.connectEnd - timing.connectStart,
ssl: timing.secureConnectionStart > 0 ? timing.connectEnd - timing.secureConnectionStart : 0,
ttfb: timing.responseStart - timing.requestStart,
download: timing.responseEnd - timing.responseStart,
dom_parse: timing.domInteractive - timing.responseEnd,
};
for (const [name, value] of Object.entries(metrics)) {
if (value > 0) {
this.reportMetric(name, value, 'ms');
}
}
if (this.pageLoadTransaction && this.pageLoadTransaction.sampled !== false) {
this.buildNavigationSpans(timing, navigationStart);
this.finishPageLoadTransaction(timing.loadEventEnd || now());
}
this.navLoadTimer = null;
}, 0);
};
window.addEventListener('load', this.onLoad);
}
private buildNavigationSpans(timing: PerformanceTiming, navigationStart: number): void {
const spanDefs: Array<{ op: string; desc: string; start: number; end: number }> = [
{ op: 'dns', desc: 'DNS Lookup', start: timing.domainLookupStart, end: timing.domainLookupEnd },
{ op: 'tcp', desc: 'TCP Connection', start: timing.connectStart, end: timing.connectEnd },
{ op: 'ssl', desc: 'SSL/TLS Negotiation', start: timing.secureConnectionStart, end: timing.connectEnd },
{ op: 'ttfb', desc: 'Time to First Byte', start: timing.requestStart, end: timing.responseStart },
{ op: 'response', desc: 'Response Download', start: timing.responseStart, end: timing.responseEnd },
{ op: 'dom_parse', desc: 'DOM Parsing', start: timing.responseEnd, end: timing.domInteractive },
{ op: 'dom_content_loaded', desc: 'DOM Content Loaded', start: timing.domLoading, end: timing.domContentLoadedEventEnd },
{ op: 'load', desc: 'Page Load', start: timing.navigationStart, end: timing.loadEventEnd },
];
for (const def of spanDefs) {
if (def.start > 0 && def.end > 0 && def.end > def.start) {
this.createNavigationSpan(
def.op,
def.desc,
def.start,
def.end
);
}
}
}
private finishPageLoadTransaction(endTime: number): void {
if (!this.pageLoadTransaction) return;
if (Object.keys(this.measurements).length > 0) {
(this.pageLoadTransaction as unknown as { setData: (k: string, v: unknown) => void }).setData(
'measurements',
this.measurements
);
}
this.pageLoadTransaction.setStatus('ok');
this.pageLoadTransaction.finish(endTime);
this.pageLoadTransaction = null;
}
private observeResources(): void {
if (!this.config.captureResources && !this.config.enablePageLoadTracing) return;
if (typeof performance === 'undefined') return;
try {
const po = new PerformanceObserver((entryList) => {
const entries = entryList.getEntriesByType('resource') as PerformanceResourceTiming[];
for (const entry of entries) {
if (entry.duration > 1000 && this.config.captureResources) {
this.reportMetric('resource_slow', entry.duration, 'ms', {
resource_name: entry.name.substring(0, 200),
resource_type: entry.initiatorType,
}, 'resource');
}
if (this.config.enablePageLoadTracing && this.pageLoadTransaction) {
this.createResourceSpan(entry);
}
}
});
po.observe({ type: 'resource', buffered: true });
this.observers.push(po);
} catch {
// Resource timing not supported
}
}
private getRating(name: string, value: number): 'good' | 'needs-improvement' | 'poor' {
const thresholds: Record<string, { good: number; poor: number }> = {
LCP: { good: 2500, poor: 4000 },
FCP: { good: 1800, poor: 3000 },
FP: { good: 1800, poor: 3000 },
FID: { good: 100, poor: 300 },
CLS: { good: 0.1, poor: 0.25 },
TTFB: { good: 800, poor: 1800 },
};
const threshold = thresholds[name];
if (!threshold) return 'good';
if (value <= threshold.good) return 'good';
if (value <= threshold.poor) return 'needs-improvement';
return 'poor';
}
private reportMetric(name: string, value: number, unit: string, extraTags: Record<string, string> = {}, sampleType: 'default' | 'resource' | 'longtask' | 'vitals' = 'default'): void {
if (!this.shouldSample(sampleType)) return;
const rating = this.getRating(name, value);
const event: PerformanceEvent = {
type: 'performance',
level: 'info',
metric: name,
value: Math.round(value * 100) / 100,
unit,
rating,
timestamp: now(),
tags: {
metric: name,
rating,
...extraTags,
},
};
this.client.captureEvent(event);
if (this.pageLoadTransaction && this.pageLoadTransaction.sampled !== false) {
this.recordMeasurement(name, value, unit, rating);
}
}
private recordMeasurement(name: string, value: number, unit?: string, rating?: 'good' | 'needs-improvement' | 'poor'): void {
if (!this.pageLoadTransaction) return;
this.measurements[name] = {
value: Math.round(value * 100) / 100,
unit,
rating,
};
this.pageLoadTransaction.setTag(`measurement.${name}.rating`, rating || 'unknown');
}
private createNavigationSpan(
op: string,
description: string,
startTime: number,
endTime: number,
tags?: Record<string, string>
): void {
if (!this.pageLoadTransaction || this.pageLoadTransaction.sampled === false) return;
if (endTime <= startTime) return;
const span = this.pageLoadTransaction.startChild({
op: `browser.${op}`,
description,
startTimestamp: startTime,
tags,
});
span.finish(endTime);
}
private createResourceSpan(entry: PerformanceResourceTiming): void {
if (!this.pageLoadTransaction || this.pageLoadTransaction.sampled === false) return;
const maxResources = this.config.maxResourceSpans ?? 50;
if (this.resourceSpanCount >= maxResources) return;
this.resourceSpanCount++;
const timeOrigin = typeof performance !== 'undefined' && performance.timeOrigin
? performance.timeOrigin
: (performance.timing?.navigationStart || 0);
const startTime = timeOrigin + entry.startTime;
const endTime = timeOrigin + (entry.responseEnd || entry.duration || entry.startTime);
if (endTime <= startTime) return;
const url = entry.name.substring(0, 200);
const span = this.pageLoadTransaction.startChild({
op: `resource.${entry.initiatorType || 'other'}`,
description: url,
startTimestamp: startTime,
tags: {
'resource.type': entry.initiatorType || 'other',
'resource.url': url,
'resource.transfer_size': String(entry.transferSize || 0),
'resource.decoded_size': String(entry.decodedBodySize || 0),
},
data: {
transferSize: entry.transferSize,
decodedSize: entry.decodedBodySize,
encodedSize: entry.encodedBodySize,
},
});
span.finish(endTime);
}
destroy(): void {
for (const observer of this.observers) {
try {
observer.disconnect();
} catch {
// ignore
}
}
this.observers = [];
if (this.ttiTimer) {
clearTimeout(this.ttiTimer);
this.ttiTimer = null;
}
if (this.navLoadTimer) {
clearTimeout(this.navLoadTimer);
this.navLoadTimer = null;
}
if (typeof window !== 'undefined' && this.onLoad) {
window.removeEventListener('load', this.onLoad);
}
if (this.pageLoadTransaction) {
this.pageLoadTransaction.setStatus('internal_error');
this.pageLoadTransaction.finish();
this.pageLoadTransaction = null;
}
this.measurements = {};
this.resourceSpanCount = 0;
}
}
export default PerformancePlugin;
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