686 lines
23 KiB
JavaScript
686 lines
23 KiB
JavaScript
/*!
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* otel-rum.js - browser error/RUM collector for go-otel.
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*
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* Captures uncaught errors, unhandled promise rejections, failed resource
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* loads, failing HTTP requests and Web Vitals (LCP/INP/CLS/TTFB/FCP), and
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* ships them as OTLP log records to this server's existing /v1/logs endpoint
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* (no separate ingestion path needed - the backend's issue view picks these
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* up like any other error log).
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*
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* Also exposes a `traceHeaders()` helper so outgoing `fetch`/XHR calls can
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* carry a W3C `traceparent` header. If the backend service is itself
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* OTel-instrumented and honors incoming trace context (most server
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* instrumentation does by default), spans it creates for that request will
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* share the same trace id - so a frontend error and the backend spans it
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* triggered can be found together via GET /api/traces/{traceId}.
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*
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* Usage:
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* <script src="https://otel.k6n.net/static/otel-rum.js"></script>
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* <script>
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* var rum = OtelRUM.init({
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* serviceName: 'my-web-app',
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* baseUrl: 'https://otel.example.com', // optional collector override
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* });
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*
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* // Manual correlation-id injection into any HTTP client:
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* fetch('/api/orders', { headers: rum.traceHeaders() });
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*
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* // Manual error reporting:
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* try { risky(); } catch (err) { rum.captureException(err); }
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* </script>
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*
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* Events are batched client-side (flushed on pagehide via keepalive fetch/sendBeacon) and
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* rate-limited, so a runaway error loop cannot hammer the collector.
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*
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* Source-map resolution is performed server-side by go-otel when a matching
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* release map has been uploaded. Session replay and PII scrubbing remain out
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* of scope; don't route sensitive data through breadcrumbs/attributes.
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*/
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(function (global) {
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'use strict';
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var DEFAULT_BASE_URL = 'https://otel.k6n.net';
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// Find the loading script so declarative data-* configuration keeps working.
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try {
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var scriptEl = (typeof document !== 'undefined') ? (document.currentScript || (function() {
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var scripts = document.getElementsByTagName('script');
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for (var i = scripts.length - 1; i >= 0; i--) {
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if (scripts[i].src && scripts[i].src.indexOf('otel-rum') !== -1) return scripts[i];
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}
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return null;
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})()) : null;
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} catch (e) {}
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var rawFetch = typeof global.fetch === 'function' ? global.fetch : null;
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var rawXHR = typeof global.XMLHttpRequest === 'function' ? global.XMLHttpRequest : null;
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function randomHex(len) {
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var chars = '0123456789abcdef';
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var out = '';
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for (var i = 0; i < len; i++) {
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out += chars[(Math.random() * 16) | 0];
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}
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return out;
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}
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// W3C Trace Context ids: 16-byte trace id, 8-byte span id, both hex.
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function newTraceId() {
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return randomHex(32);
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}
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function newSpanId() {
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return randomHex(16);
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}
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function isSameOrigin(url) {
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try {
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var resolved = new global.URL(url, global.location.href);
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return resolved.origin === global.location.origin;
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} catch (e) {
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return false;
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}
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}
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function toOtlpAttributes(obj) {
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var out = [];
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for (var key in obj) {
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if (!Object.prototype.hasOwnProperty.call(obj, key)) continue;
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var value = obj[key];
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if (value === undefined || value === null || value === '') continue;
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out.push({ key: key, value: { stringValue: String(value) } });
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}
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return out;
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}
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function init(config) {
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config = config || {};
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var scriptServiceName = (scriptEl && (scriptEl.getAttribute('data-service-name') || scriptEl.getAttribute('data-service'))) || '';
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var scriptBaseUrl = (scriptEl && scriptEl.getAttribute('data-base-url')) || '';
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var scriptEndpoint = (scriptEl && scriptEl.getAttribute('data-endpoint')) || '';
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var scriptIngestKey = (scriptEl && scriptEl.getAttribute('data-ingest-key')) || '';
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// Collector base URL resolution:
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// 1. Explicit config.baseUrl or scriptEl data-base-url
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// 2. Production collector: https://otel.k6n.net
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// Do not derive this from the page or script origin: the script may be
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// bundled or self-hosted while logs still belong at the collector.
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var baseUrl = (config.baseUrl || scriptBaseUrl || DEFAULT_BASE_URL).replace(/\/+$/, '');
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var endpoint = config.endpoint || scriptEndpoint;
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if (!endpoint) {
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endpoint = baseUrl + '/v1/logs';
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} else if (!/^https?:\/\//i.test(endpoint) && !endpoint.startsWith('//')) {
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endpoint = baseUrl + '/' + endpoint.replace(/^\/+/, '');
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}
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function isCollectorUrl(u) {
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if (!u) return false;
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var s = String(u);
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if (endpoint && s.indexOf(endpoint) === 0) return true;
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if (s.indexOf('/v1/logs') !== -1 || s.indexOf('/v1/traces') !== -1 || s.indexOf('/v1/metrics') !== -1) return true;
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return false;
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}
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var serviceName = config.serviceName || scriptServiceName || 'frontend';
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var environment = config.environment || (scriptEl && scriptEl.getAttribute('data-environment')) || '';
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var release = config.release || (scriptEl && scriptEl.getAttribute('data-release')) || '';
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var ingestKey = config.ingestKey || scriptIngestKey || '';
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var sampleRate = typeof config.sampleRate === 'number' ? config.sampleRate : 1;
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var maxBreadcrumbs = config.maxBreadcrumbs || 20;
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var captureConsoleErrors = config.captureConsoleErrors !== false;
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var autoInstrumentFetch = config.autoInstrumentFetch !== false;
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var autoInstrumentXhr = config.autoInstrumentXhr !== false;
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var trackSpaRoutes = config.trackSpaRoutes !== false;
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var reportHttpFailures = config.reportHttpFailures !== false;
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var captureWebVitals = config.captureWebVitals !== false;
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var injectTraceHeaders = config.injectTraceHeaders !== false;
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var traceHeaderOrigins = config.traceHeaderOrigins; // optional array; defaults to same-origin only
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// Client-side rate limiting: max events per rolling minute.
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var maxEventsPerMinute = config.maxEventsPerMinute || 60;
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// Batch size / flush interval for queued records.
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var batchSize = config.batchSize || 10;
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var flushIntervalMs = config.flushIntervalMs || 5000;
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var breadcrumbs = [];
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// Best-effort correlation: the most recently generated trace id is
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// attached to the next error report, so an error surfacing shortly
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// after a failed request can usually be found alongside it. This is
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// not a real per-async-context propagation mechanism.
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var lastTraceId = '';
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// Session id: survives reloads within the tab's lifetime, so server
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//-side issue views can group frontend errors by browsing session.
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var sessionId = '';
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try {
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sessionId = global.sessionStorage.getItem('otel-rum-session');
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if (!sessionId) {
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sessionId = randomHex(16);
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global.sessionStorage.setItem('otel-rum-session', sessionId);
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}
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} catch (e) {
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sessionId = randomHex(16); // storage blocked (privacy mode etc.)
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}
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// --- Client-side queue, batching and rate limiting -----------------
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var queue = [];
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var flushTimer = null;
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var sentTimestamps = [];
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var eventsDropped = 0;
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function underRateLimit() {
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var now = Date.now();
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// Drop timestamps older than the rolling 60s window.
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while (sentTimestamps.length && now - sentTimestamps[0] > 60000) {
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sentTimestamps.shift();
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}
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if (sentTimestamps.length >= maxEventsPerMinute) return false;
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sentTimestamps.push(now);
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return true;
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}
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function enqueue(record) {
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queue.push(record);
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if (queue.length >= batchSize) {
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flush();
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return;
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}
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if (!flushTimer) {
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flushTimer = global.setTimeout(flush, flushIntervalMs);
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}
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}
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function flush() {
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if (flushTimer) {
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global.clearTimeout(flushTimer);
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flushTimer = null;
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}
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if (!queue.length) return;
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var records = queue.splice(0, queue.length);
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ship(records);
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}
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// ship sends already-built log records in one OTLP payload. Uses
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// sendBeacon when available (survives page unload), else keepalive
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// fetch.
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function ship(records) {
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var payload = {
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resourceLogs: [
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{
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resource: { attributes: toOtlpAttributes({ 'service.name': serviceName }) },
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scopeLogs: [{ scope: { name: 'otel-rum' }, logRecords: records }]
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}
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]
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};
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var body = JSON.stringify(payload);
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var url = endpoint;
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if (ingestKey) {
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url += (url.indexOf('?') === -1 ? '?' : '&') + 'key=' + encodeURIComponent(ingestKey);
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}
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// Use uninstrumented rawFetch with keepalive: true and mode: 'cors'
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// to avoid intercepting and looping on our own telemetry requests.
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var fetchFn = rawFetch || (typeof global.fetch === 'function' ? global.fetch : null);
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if (fetchFn) {
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var fetchHeaders = { 'Content-Type': 'application/json' };
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if (ingestKey) {
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fetchHeaders['X-Otel-Ingest-Key'] = ingestKey;
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}
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fetchFn.call(global, url, {
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method: 'POST',
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mode: 'cors',
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headers: fetchHeaders,
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body: body,
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keepalive: true
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}).catch(function () {
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if (global.navigator && typeof global.navigator.sendBeacon === 'function') {
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try {
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var blob = new global.Blob([body], { type: 'text/plain;charset=UTF-8' });
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global.navigator.sendBeacon(url, blob);
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} catch (e) {}
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}
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});
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return;
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}
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if (global.navigator && typeof global.navigator.sendBeacon === 'function') {
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try {
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var blob = new global.Blob([body], { type: 'text/plain;charset=UTF-8' });
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global.navigator.sendBeacon(url, blob);
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} catch (e) {}
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}
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}
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var severityNumbers = { DEBUG: 5, INFO: 9, WARN: 13, ERROR: 17, FATAL: 21 };
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function buildRecord(severity, message, attrs, traceId) {
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var record = {
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timeUnixNano: String(Date.now() * 1e6),
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severityText: severity,
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severityNumber: severityNumbers[severity] || 17,
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body: { stringValue: String(message).slice(0, 2000) },
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attributes: toOtlpAttributes(
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Object.assign(
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{},
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contextAttrs,
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{
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source: 'frontend',
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'browser.url': global.location ? global.location.href : '',
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'browser.userAgent': global.navigator ? global.navigator.userAgent : '',
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'browser.viewport': global.innerWidth ? global.innerWidth + 'x' + global.innerHeight : '',
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'session.id': sessionId,
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'service.release': release,
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'service.environment': environment,
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breadcrumbs: breadcrumbs.length ? JSON.stringify(breadcrumbs) : undefined
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},
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attrs || {}
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)
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)
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};
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if (traceId) {
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record.traceId = traceId;
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}
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return record;
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}
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function send(severity, message, attrs, traceId) {
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if (sampleRate < 1 && Math.random() > sampleRate) return;
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if (!underRateLimit()) {
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eventsDropped++;
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return;
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}
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enqueue(buildRecord(severity, message, attrs, traceId));
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}
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// Web Vitals via PerformanceObserver. Values are reported as INFO logs
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// tagged rum.vital=<name>; the server can chart/aggregate them like
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// any other telemetry. Each vital fires once when it reaches its
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// final value (plus a first-input proxy for INP on older browsers).
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function observeVitals() {
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if (typeof global.PerformanceObserver !== 'function') return;
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function report(name, value, extra) {
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var attrs = Object.assign({ 'rum.vital': name, 'rum.value': Math.round(value) }, extra || {});
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// Vitals are telemetry, not errors: bypass the error rate limit
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// but keep sampling.
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if (sampleRate < 1 && Math.random() > sampleRate) return;
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enqueue(buildRecord('INFO', name + ' ' + Math.round(value), attrs, ''));
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}
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function onPaint(list) {
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list.getEntries().forEach(function (entry) {
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if (entry.name === 'first-contentful-paint') report('FCP', entry.startTime);
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});
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}
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function onLCP(list) {
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var entries = list.getEntries();
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var last = entries[entries.length - 1];
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if (last) report('LCP', last.startTime, { 'rum.element': last.element && last.element.tagName });
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}
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function onCLS() {
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var cls = 0;
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var lastReport = 0;
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var observer = new global.PerformanceObserver(function (list) {
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list.getEntries().forEach(function (entry) {
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if (!entry.hadRecentInput) cls += entry.value;
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});
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// Throttle: report at most once per 10s, plus a final value on
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// pagehide, instead of once per layout shift.
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var now = Date.now();
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if (now - lastReport > 10000) {
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lastReport = now;
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report('CLS', Math.round(cls * 1000) / 1000);
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}
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clsFinal = function () {
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report('CLS', Math.round(cls * 1000) / 1000);
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clsFinal = null;
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};
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});
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try {
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observer.observe({ type: 'layout-shift', buffered: true });
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} catch (e) {
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/* unsupported */
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clsFinal = null;
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}
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}
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function onINP(entry) {
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var duration = entry.duration;
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var interactionId = entry.interactionId;
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if (!interactionId) return;
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if (duration > (observerState.maxINP || 0)) {
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observerState.maxINP = duration;
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report('INP', duration);
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}
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}
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var observerState = {};
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try {
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new global.PerformanceObserver(onPaint).observe({ type: 'paint', buffered: true });
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} catch (e) {}
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try {
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new global.PerformanceObserver(onLCP).observe({ type: 'largest-contentful-paint', buffered: true });
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} catch (e) {}
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onCLS();
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try {
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new global.PerformanceObserver(function (list) {
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list.getEntries().forEach(onINP);
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}).observe({ type: 'event', buffered: true, durationThreshold: 40 });
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} catch (e) {}
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// Navigation timing: TTFB.
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try {
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var nav = performance.getEntriesByType('navigation')[0];
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if (nav && nav.responseStart) {
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report('TTFB', nav.responseStart);
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}
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} catch (e) {}
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}
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// traceHeaders returns a headers object carrying a fresh (or
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// continued) W3C traceparent, ready to spread into any HTTP client's
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// request headers - fetch, XHR, axios, etc.
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function traceHeaders(existingTraceId) {
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var traceId = existingTraceId || newTraceId();
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var spanId = newSpanId();
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lastTraceId = traceId;
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return { traceparent: '00-' + traceId + '-' + spanId + '-01' };
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}
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function captureException(err, extra) {
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var message = (err && err.message) || String(err);
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send(
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'ERROR',
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message,
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Object.assign(
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{
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'exception.type': (err && err.name) || 'Error',
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'exception.message': message,
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'exception.stacktrace': (err && err.stack) || ''
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},
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extra || {}
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),
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lastTraceId
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);
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}
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function captureMessage(message, severity, extra) {
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send(severity || 'ERROR', message, extra, lastTraceId);
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}
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function setContext(context) {
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// Attach stable context (e.g. { user: 'u-123', plan: 'pro' }) to
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// every subsequent event. Values become OTLP attributes prefixed
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// with "context.".
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contextAttrs = Object.assign({}, contextAttrs, context || {});
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flush(); // ensure earlier queued events don't mix contexts ambiguously
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}
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var contextAttrs = {};
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var clsFinal = null;
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function onError(event) {
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// Resource load errors (img/script/link) surface as an ErrorEvent-less
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// Event targeting the failed element; script errors carry a message.
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var target = event.target;
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if (target && target !== global && target.tagName) {
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var tag = String(target.tagName).toLowerCase();
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if (tag === 'img' || tag === 'script' || tag === 'link') {
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var url = target.src || target.href || '';
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captureMessage('Failed to load ' + tag + ': ' + url, 'ERROR', {
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'exception.type': 'ResourceLoadError',
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'resource.tag': tag,
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'resource.url': url
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});
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}
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return;
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}
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var message = event.message || 'Script error';
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captureException(event.error || { name: 'Error', message: message }, {
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'source.file': event.filename || '',
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'source.line': event.lineno,
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'source.column': event.colno
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});
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}
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function onUnhandledRejection(event) {
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var reason = event.reason;
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captureException(reason instanceof Error ? reason : { name: 'UnhandledRejection', message: String(reason) }, {
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'exception.type': (reason && reason.name) || 'UnhandledRejection'
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});
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}
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global.addEventListener('error', onError);
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// Resource load errors don't bubble - must listen on the capturing phase.
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global.addEventListener('error', onError, true);
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global.addEventListener('unhandledrejection', onUnhandledRejection);
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if (captureConsoleErrors && global.console && typeof global.console.error === 'function') {
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var originalConsoleError = global.console.error;
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global.console.error = function () {
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try {
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addBreadcrumb('console.error', Array.prototype.slice.call(arguments).join(' '));
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} catch (e) {
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/* ignore */
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}
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return originalConsoleError.apply(global.console, arguments);
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};
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}
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function shouldInject(url) {
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if (!injectTraceHeaders) return false;
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if (!traceHeaderOrigins) return isSameOrigin(url);
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return traceHeaderOrigins.some(function (o) {
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return url.indexOf(o) === 0;
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});
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}
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// httpFailureReport reports a failed HTTP round-trip as an ERROR event,
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// so backend 5xx/4xx responses show up in the Issues view even when
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// the app code swallows them.
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function httpFailureReport(kind, method, url, status, traceId, extra) {
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// Issue refresh failures must not create new issues notifications:
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// otherwise an expired session can form an API-error feedback loop.
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try {
|
|
if (new global.URL(url, global.location.href).pathname === '/api/issues') return;
|
|
} catch (e) {}
|
|
var attrs = Object.assign(
|
|
{
|
|
'exception.type': 'HttpFailure',
|
|
'http.request.method': method,
|
|
'url.full': String(url).slice(0, 500),
|
|
'http.response.status_code': status === undefined || status === 0 ? '' : String(status)
|
|
},
|
|
extra || {}
|
|
);
|
|
captureMessage(
|
|
method + ' ' + url + ' failed with ' + (status === undefined || status === 0 ? 'network error' : 'HTTP ' + status),
|
|
'ERROR',
|
|
attrs
|
|
);
|
|
}
|
|
|
|
if (autoInstrumentFetch && typeof global.fetch === 'function') {
|
|
var originalFetch = global.fetch;
|
|
global.fetch = function (input, requestInit) {
|
|
var url = typeof input === 'string' ? input : (input && input.url) || '';
|
|
if (isCollectorUrl(url)) {
|
|
return originalFetch.call(global, input, requestInit);
|
|
}
|
|
var method = (requestInit && requestInit.method) || (input && input.method) || 'GET';
|
|
var requestTraceId = '';
|
|
|
|
if (shouldInject(url)) {
|
|
requestInit = requestInit || {};
|
|
var headers = new global.Headers(requestInit.headers || (input && input.headers) || {});
|
|
var th = traceHeaders();
|
|
headers.set('traceparent', th.traceparent);
|
|
requestTraceId = th.traceparent.slice(3, 35); // trace id portion
|
|
requestInit = Object.assign({}, requestInit, { headers: headers });
|
|
}
|
|
|
|
return originalFetch.call(global, input, requestInit).then(
|
|
function (res) {
|
|
addBreadcrumb('fetch', method + ' ' + url + ' -> ' + res.status);
|
|
if (reportHttpFailures && res.status >= 400) {
|
|
httpFailureReport('fetch', method, url, res.status, requestTraceId);
|
|
}
|
|
return res;
|
|
},
|
|
function (err) {
|
|
addBreadcrumb('fetch', method + ' ' + url + ' -> error');
|
|
if (reportHttpFailures) {
|
|
httpFailureReport('fetch', method, url, 0, requestTraceId);
|
|
}
|
|
throw err;
|
|
}
|
|
);
|
|
};
|
|
}
|
|
|
|
// XHR instrumentation: trace-header injection + breadcrumbs + failure
|
|
// reporting, so legacy code paths (axios older versions, jQuery, etc.)
|
|
// get the same visibility as fetch.
|
|
if (autoInstrumentXhr && typeof global.XMLHttpRequest === 'function') {
|
|
var originalOpen = global.XMLHttpRequest.prototype.open;
|
|
var originalSend = global.XMLHttpRequest.prototype.send;
|
|
var originalSetRequestHeader = global.XMLHttpRequest.prototype.setRequestHeader;
|
|
|
|
global.XMLHttpRequest.prototype.open = function (method, url) {
|
|
if (isCollectorUrl(url)) {
|
|
return originalOpen.apply(this, arguments);
|
|
}
|
|
try {
|
|
this.__rum = { method: String(method), url: String(url) };
|
|
if (shouldInject(String(url))) {
|
|
var th = traceHeaders();
|
|
this.__rum.traceId = th.traceparent.slice(3, 35);
|
|
originalSetRequestHeader.call(this, 'traceparent', th.traceparent);
|
|
}
|
|
} catch (e) {
|
|
/* ignore */
|
|
}
|
|
return originalOpen.apply(this, arguments);
|
|
};
|
|
|
|
global.XMLHttpRequest.prototype.send = function () {
|
|
var xhr = this;
|
|
var info = xhr.__rum || {};
|
|
if (info.url) {
|
|
var origHandler = xhr.onreadystatechange;
|
|
xhr.onreadystatechange = function () {
|
|
try {
|
|
if (xhr.readyState === 4) {
|
|
addBreadcrumb('xhr', info.method + ' ' + info.url + ' -> ' + xhr.status);
|
|
if (reportHttpFailures && (xhr.status === 0 || xhr.status >= 400)) {
|
|
httpFailureReport('xhr', info.method, info.url, xhr.status, info.traceId);
|
|
}
|
|
}
|
|
} catch (e) {
|
|
/* ignore */
|
|
}
|
|
if (origHandler) return origHandler.apply(this, arguments);
|
|
};
|
|
}
|
|
return originalSend.apply(this, arguments);
|
|
};
|
|
}
|
|
|
|
// SPA route-change breadcrumbs: history.pushState/replaceState and
|
|
// popstate/hashes get recorded so an error report shows which route
|
|
// transitions preceded it.
|
|
if (trackSpaRoutes && global.history) {
|
|
function recordRoute(kind) {
|
|
addBreadcrumb('navigation', kind + ' ' + (global.location ? global.location.pathname + global.location.search : ''));
|
|
}
|
|
var originalPush = global.history.pushState;
|
|
var originalReplace = global.history.replaceState;
|
|
if (typeof originalPush === 'function') {
|
|
global.history.pushState = function () {
|
|
var result = originalPush.apply(this, arguments);
|
|
try {
|
|
recordRoute('pushState');
|
|
} catch (e) {}
|
|
return result;
|
|
};
|
|
}
|
|
if (typeof originalReplace === 'function') {
|
|
global.history.replaceState = function () {
|
|
var result = originalReplace.apply(this, arguments);
|
|
try {
|
|
recordRoute('replaceState');
|
|
} catch (e) {}
|
|
return result;
|
|
};
|
|
}
|
|
global.addEventListener('popstate', function () {
|
|
try {
|
|
recordRoute('popstate');
|
|
} catch (e) {}
|
|
});
|
|
}
|
|
|
|
// Flush pending events when the page is being hidden or unloaded so
|
|
// errors that happen right before navigation are not lost, and emit
|
|
// the final CLS value.
|
|
global.addEventListener('pagehide', function () {
|
|
if (clsFinal) clsFinal();
|
|
flush();
|
|
});
|
|
global.addEventListener('visibilitychange', function () {
|
|
if (global.document && global.document.visibilityState === 'hidden') {
|
|
if (clsFinal) clsFinal();
|
|
flush();
|
|
}
|
|
});
|
|
|
|
// First paint: report vitals after observers have a chance to buffer.
|
|
if (captureWebVitals) {
|
|
observeVitals();
|
|
}
|
|
|
|
function addBreadcrumb(category, message) {
|
|
breadcrumbs.push({ t: Date.now(), category: String(category), message: String(message) });
|
|
if (breadcrumbs.length > maxBreadcrumbs) {
|
|
breadcrumbs.shift();
|
|
}
|
|
}
|
|
|
|
var instance = {
|
|
captureException: captureException,
|
|
captureMessage: captureMessage,
|
|
addBreadcrumb: addBreadcrumb,
|
|
setContext: setContext,
|
|
flush: flush,
|
|
newTraceId: newTraceId,
|
|
newSpanId: newSpanId,
|
|
traceHeaders: traceHeaders
|
|
};
|
|
|
|
// Convenience handle for manual/console verification:
|
|
// OtelRUM.last.captureMessage('test from console').
|
|
global.OtelRUM.last = instance;
|
|
return instance;
|
|
}
|
|
|
|
global.OtelRUM = { init: init, newTraceId: newTraceId, newSpanId: newSpanId, last: undefined };
|
|
|
|
// Auto-initialize if data attributes are declared on the <script> element
|
|
try {
|
|
if (typeof document !== 'undefined' && scriptEl && (scriptEl.getAttribute('data-auto-init') === 'true' || scriptEl.getAttribute('data-service-name') || scriptEl.getAttribute('data-service'))) {
|
|
if (document.readyState === 'loading') {
|
|
document.addEventListener('DOMContentLoaded', function () {
|
|
global.OtelRUM.init();
|
|
});
|
|
} else {
|
|
global.OtelRUM.init();
|
|
}
|
|
}
|
|
} catch (e) {}
|
|
})(typeof window !== 'undefined' ? window : this);
|