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import { addXhrInstrumentationHandler, addPerformanceInstrumentationHandler, SENTRY_XHR_DATA_KEY } from '@sentry-internal/browser-utils';
import { instrumentFetchRequest, spanToJSON, hasTracingEnabled, setHttpStatus, getActiveSpan, startInactiveSpan, SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN, SEMANTIC_ATTRIBUTE_SENTRY_OP, SentryNonRecordingSpan, getClient, getCurrentScope, getIsolationScope, spanToTraceHeader, getDynamicSamplingContextFromSpan, getDynamicSamplingContextFromClient } from '@sentry/core';
import { addFetchEndInstrumentationHandler, addFetchInstrumentationHandler, parseUrl, browserPerformanceTimeOrigin, generateSentryTraceHeader, dynamicSamplingContextToSentryBaggageHeader, BAGGAGE_HEADER_NAME, stringMatchesSomePattern } from '@sentry/utils';
import { WINDOW } from '../helpers.js';
/** Options for Request Instrumentation */
const responseToSpanId = new WeakMap();
const spanIdToEndTimestamp = new Map();
const defaultRequestInstrumentationOptions = {
traceFetch: true,
traceXHR: true,
enableHTTPTimings: true,
};
/** Registers span creators for xhr and fetch requests */
function instrumentOutgoingRequests(client, _options) {
const { traceFetch, traceXHR, shouldCreateSpanForRequest, enableHTTPTimings, tracePropagationTargets } = {
traceFetch: defaultRequestInstrumentationOptions.traceFetch,
traceXHR: defaultRequestInstrumentationOptions.traceXHR,
..._options,
};
const shouldCreateSpan =
typeof shouldCreateSpanForRequest === 'function' ? shouldCreateSpanForRequest : (_) => true;
const shouldAttachHeadersWithTargets = (url) => shouldAttachHeaders(url, tracePropagationTargets);
const spans = {};
if (traceFetch) {
// Keeping track of http requests, whose body payloads resolved later than the intial resolved request
// e.g. streaming using server sent events (SSE)
client.addEventProcessor(event => {
if (event.type === 'transaction' && event.spans) {
event.spans.forEach(span => {
if (span.op === 'http.client') {
const updatedTimestamp = spanIdToEndTimestamp.get(span.span_id);
if (updatedTimestamp) {
span.timestamp = updatedTimestamp / 1000;
spanIdToEndTimestamp.delete(span.span_id);
}
}
});
}
return event;
});
addFetchEndInstrumentationHandler(handlerData => {
if (handlerData.response) {
const span = responseToSpanId.get(handlerData.response);
if (span && handlerData.endTimestamp) {
spanIdToEndTimestamp.set(span, handlerData.endTimestamp);
}
}
});
addFetchInstrumentationHandler(handlerData => {
const createdSpan = instrumentFetchRequest(handlerData, shouldCreateSpan, shouldAttachHeadersWithTargets, spans);
if (handlerData.response && handlerData.fetchData.__span) {
responseToSpanId.set(handlerData.response, handlerData.fetchData.__span);
}
// We cannot use `window.location` in the generic fetch instrumentation,
// but we need it for reliable `server.address` attribute.
// so we extend this in here
if (createdSpan) {
const fullUrl = getFullURL(handlerData.fetchData.url);
const host = fullUrl ? parseUrl(fullUrl).host : undefined;
createdSpan.setAttributes({
'http.url': fullUrl,
'server.address': host,
});
}
if (enableHTTPTimings && createdSpan) {
addHTTPTimings(createdSpan);
}
});
}
if (traceXHR) {
addXhrInstrumentationHandler(handlerData => {
const createdSpan = xhrCallback(handlerData, shouldCreateSpan, shouldAttachHeadersWithTargets, spans);
if (enableHTTPTimings && createdSpan) {
addHTTPTimings(createdSpan);
}
});
}
}
function isPerformanceResourceTiming(entry) {
return (
entry.entryType === 'resource' &&
'initiatorType' in entry &&
typeof (entry ).nextHopProtocol === 'string' &&
(entry.initiatorType === 'fetch' || entry.initiatorType === 'xmlhttprequest')
);
}
/**
* Creates a temporary observer to listen to the next fetch/xhr resourcing timings,
* so that when timings hit their per-browser limit they don't need to be removed.
*
* @param span A span that has yet to be finished, must contain `url` on data.
*/
function addHTTPTimings(span) {
const { url } = spanToJSON(span).data || {};
if (!url || typeof url !== 'string') {
return;
}
const cleanup = addPerformanceInstrumentationHandler('resource', ({ entries }) => {
entries.forEach(entry => {
if (isPerformanceResourceTiming(entry) && entry.name.endsWith(url)) {
const spanData = resourceTimingEntryToSpanData(entry);
spanData.forEach(data => span.setAttribute(...data));
// In the next tick, clean this handler up
// We have to wait here because otherwise this cleans itself up before it is fully done
setTimeout(cleanup);
}
});
});
}
/**
* Converts ALPN protocol ids to name and version.
*
* (https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids)
* @param nextHopProtocol PerformanceResourceTiming.nextHopProtocol
*/
function extractNetworkProtocol(nextHopProtocol) {
let name = 'unknown';
let version = 'unknown';
let _name = '';
for (const char of nextHopProtocol) {
// http/1.1 etc.
if (char === '/') {
[name, version] = nextHopProtocol.split('/') ;
break;
}
// h2, h3 etc.
if (!isNaN(Number(char))) {
name = _name === 'h' ? 'http' : _name;
version = nextHopProtocol.split(_name)[1] ;
break;
}
_name += char;
}
if (_name === nextHopProtocol) {
// webrtc, ftp, etc.
name = _name;
}
return { name, version };
}
function getAbsoluteTime(time = 0) {
return ((browserPerformanceTimeOrigin || performance.timeOrigin) + time) / 1000;
}
function resourceTimingEntryToSpanData(resourceTiming) {
const { name, version } = extractNetworkProtocol(resourceTiming.nextHopProtocol);
const timingSpanData = [];
timingSpanData.push(['network.protocol.version', version], ['network.protocol.name', name]);
if (!browserPerformanceTimeOrigin) {
return timingSpanData;
}
return [
...timingSpanData,
['http.request.redirect_start', getAbsoluteTime(resourceTiming.redirectStart)],
['http.request.fetch_start', getAbsoluteTime(resourceTiming.fetchStart)],
['http.request.domain_lookup_start', getAbsoluteTime(resourceTiming.domainLookupStart)],
['http.request.domain_lookup_end', getAbsoluteTime(resourceTiming.domainLookupEnd)],
['http.request.connect_start', getAbsoluteTime(resourceTiming.connectStart)],
['http.request.secure_connection_start', getAbsoluteTime(resourceTiming.secureConnectionStart)],
['http.request.connection_end', getAbsoluteTime(resourceTiming.connectEnd)],
['http.request.request_start', getAbsoluteTime(resourceTiming.requestStart)],
['http.request.response_start', getAbsoluteTime(resourceTiming.responseStart)],
['http.request.response_end', getAbsoluteTime(resourceTiming.responseEnd)],
];
}
/**
* A function that determines whether to attach tracing headers to a request.
* We only export this function for testing purposes.
*/
function shouldAttachHeaders(
targetUrl,
tracePropagationTargets,
) {
// window.location.href not being defined is an edge case in the browser but we need to handle it.
// Potentially dangerous situations where it may not be defined: Browser Extensions, Web Workers, patching of the location obj
const href = WINDOW.location && WINDOW.location.href;
if (!href) {
// If there is no window.location.origin, we default to only attaching tracing headers to relative requests, i.e. ones that start with `/`
// BIG DISCLAIMER: Users can call URLs with a double slash (fetch("//example.com/api")), this is a shorthand for "send to the same protocol",
// so we need a to exclude those requests, because they might be cross origin.
const isRelativeSameOriginRequest = !!targetUrl.match(/^\/(?!\/)/);
if (!tracePropagationTargets) {
return isRelativeSameOriginRequest;
} else {
return stringMatchesSomePattern(targetUrl, tracePropagationTargets);
}
} else {
let resolvedUrl;
let currentOrigin;
// URL parsing may fail, we default to not attaching trace headers in that case.
try {
resolvedUrl = new URL(targetUrl, href);
currentOrigin = new URL(href).origin;
} catch (e) {
return false;
}
const isSameOriginRequest = resolvedUrl.origin === currentOrigin;
if (!tracePropagationTargets) {
return isSameOriginRequest;
} else {
return (
stringMatchesSomePattern(resolvedUrl.toString(), tracePropagationTargets) ||
(isSameOriginRequest && stringMatchesSomePattern(resolvedUrl.pathname, tracePropagationTargets))
);
}
}
}
/**
* Create and track xhr request spans
*
* @returns Span if a span was created, otherwise void.
*/
function xhrCallback(
handlerData,
shouldCreateSpan,
shouldAttachHeaders,
spans,
) {
const xhr = handlerData.xhr;
const sentryXhrData = xhr && xhr[SENTRY_XHR_DATA_KEY];
if (!xhr || xhr.__sentry_own_request__ || !sentryXhrData) {
return undefined;
}
const shouldCreateSpanResult = hasTracingEnabled() && shouldCreateSpan(sentryXhrData.url);
// check first if the request has finished and is tracked by an existing span which should now end
if (handlerData.endTimestamp && shouldCreateSpanResult) {
const spanId = xhr.__sentry_xhr_span_id__;
if (!spanId) return;
const span = spans[spanId];
if (span && sentryXhrData.status_code !== undefined) {
setHttpStatus(span, sentryXhrData.status_code);
span.end();
// eslint-disable-next-line @typescript-eslint/no-dynamic-delete
delete spans[spanId];
}
return undefined;
}
const fullUrl = getFullURL(sentryXhrData.url);
const host = fullUrl ? parseUrl(fullUrl).host : undefined;
const hasParent = !!getActiveSpan();
const span =
shouldCreateSpanResult && hasParent
? startInactiveSpan({
name: `${sentryXhrData.method} ${sentryXhrData.url}`,
attributes: {
type: 'xhr',
'http.method': sentryXhrData.method,
'http.url': fullUrl,
url: sentryXhrData.url,
'server.address': host,
[SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN]: 'auto.http.browser',
[SEMANTIC_ATTRIBUTE_SENTRY_OP]: 'http.client',
},
})
: new SentryNonRecordingSpan();
xhr.__sentry_xhr_span_id__ = span.spanContext().spanId;
spans[xhr.__sentry_xhr_span_id__] = span;
const client = getClient();
if (xhr.setRequestHeader && shouldAttachHeaders(sentryXhrData.url) && client) {
addTracingHeadersToXhrRequest(
xhr,
client,
// If performance is disabled (TWP) or there's no active root span (pageload/navigation/interaction),
// we do not want to use the span as base for the trace headers,
// which means that the headers will be generated from the scope and the sampling decision is deferred
hasTracingEnabled() && hasParent ? span : undefined,
);
}
return span;
}
function addTracingHeadersToXhrRequest(xhr, client, span) {
const scope = getCurrentScope();
const isolationScope = getIsolationScope();
const { traceId, spanId, sampled, dsc } = {
...isolationScope.getPropagationContext(),
...scope.getPropagationContext(),
};
const sentryTraceHeader =
span && hasTracingEnabled() ? spanToTraceHeader(span) : generateSentryTraceHeader(traceId, spanId, sampled);
const sentryBaggageHeader = dynamicSamplingContextToSentryBaggageHeader(
dsc || (span ? getDynamicSamplingContextFromSpan(span) : getDynamicSamplingContextFromClient(traceId, client)),
);
setHeaderOnXhr(xhr, sentryTraceHeader, sentryBaggageHeader);
}
function setHeaderOnXhr(
xhr,
sentryTraceHeader,
sentryBaggageHeader,
) {
try {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
xhr.setRequestHeader('sentry-trace', sentryTraceHeader);
if (sentryBaggageHeader) {
// From MDN: "If this method is called several times with the same header, the values are merged into one single request header."
// We can therefore simply set a baggage header without checking what was there before
// https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
xhr.setRequestHeader(BAGGAGE_HEADER_NAME, sentryBaggageHeader);
}
} catch (_) {
// Error: InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
}
}
function getFullURL(url) {
try {
// By adding a base URL to new URL(), this will also work for relative urls
// If `url` is a full URL, the base URL is ignored anyhow
const parsed = new URL(url, WINDOW.location.origin);
return parsed.href;
} catch (e2) {
return undefined;
}
}
export { defaultRequestInstrumentationOptions, extractNetworkProtocol, instrumentOutgoingRequests, shouldAttachHeaders, xhrCallback };
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