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ajax.ts
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ajax.ts
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
import dynamicProto from "@microsoft/dynamicproto-js";
import {
CorrelationIdHelper, DisabledPropertyName, IConfig, ICorrelationConfig, IDependencyTelemetry, IRequestContext, ITelemetryContext,
PropertiesPluginIdentifier, RemoteDependencyData, RequestHeaders, createDistributedTraceContextFromTrace, createTelemetryItem,
createTraceParent, dateTimeUtilsNow, eDistributedTracingModes, eRequestHeaders, formatTraceParent, isInternalApplicationInsightsEndpoint
} from "@microsoft/applicationinsights-common";
import {
BaseTelemetryPlugin, IAppInsightsCore, IConfiguration, ICustomProperties, IDistributedTraceContext, IInstrumentCallDetails,
IInstrumentHooksCallbacks, IPlugin, IProcessTelemetryContext, ITelemetryItem, ITelemetryPluginChain, InstrumentFunc, InstrumentProto,
_eInternalMessageId, _throwInternal, arrForEach, createProcessTelemetryContext, createUniqueNamespace, deepFreeze, dumpObj,
eLoggingSeverity, eventOn, generateW3CId, getExceptionName, getGlobal, getIEVersion, getLocation, getPerformance, isFunction,
isNullOrUndefined, isString, isXhrSupported, mergeEvtNamespace, objForEachKey, strPrototype, strTrim
} from "@microsoft/applicationinsights-core-js";
import { DependencyInitializerFunction, IDependencyInitializerDetails, IDependencyInitializerHandler } from "./DependencyInitializer";
import {
DependencyListenerFunction, IDependencyHandler, IDependencyListenerContainer, IDependencyListenerDetails, IDependencyListenerHandler
} from "./DependencyListener";
import { IAjaxRecordResponse, ajaxRecord } from "./ajaxRecord";
const AJAX_MONITOR_PREFIX = "ai.ajxmn.";
const strDiagLog = "diagLog";
const strAjaxData = "ajaxData";
const STR_FETCH = "fetch";
const ERROR_HEADER = "Failed to monitor XMLHttpRequest";
const ERROR_PREFIX = ", monitoring data for this ajax call ";
const ERROR_POSTFIX = ERROR_PREFIX + "may be incorrect.";
const ERROR_NOT_SENT = ERROR_PREFIX + "won't be sent.";
const CORRELATION_HEADER_ERROR = "Failed to get Request-Context correlation header as it may be not included in the response or not accessible.";
const CUSTOM_REQUEST_CONTEXT_ERROR = "Failed to add custom defined request context as configured call back may missing a null check.";
const FAILED_TO_CALCULATE_DURATION_ERROR = "Failed to calculate the duration of the ";
// Using a global value so that to handle same iKey with multiple app insights instances (mostly for testing)
let _markCount: number = 0;
interface _IInternalDependencyHandler<F> {
id: number;
fn: F;
}
/** @Ignore */
function _supportsFetch(): (input: RequestInfo, init?: RequestInit) => Promise<Response> {
let _global = getGlobal();
if (!_global ||
isNullOrUndefined((_global as any).Request) ||
isNullOrUndefined((_global as any).Request[strPrototype]) ||
isNullOrUndefined(_global[STR_FETCH])) {
return null;
}
return _global[STR_FETCH];
}
/**
* Determines whether ajax monitoring can be enabled on this document
* @returns True if Ajax monitoring is supported on this page, otherwise false
* @ignore
*/
function _supportsAjaxMonitoring(ajaxMonitorInstance:AjaxMonitor): boolean {
let result = false;
if (isXhrSupported()) {
let proto = XMLHttpRequest[strPrototype];
result = !isNullOrUndefined(proto) &&
!isNullOrUndefined(proto.open) && // eslint-disable-line security/detect-non-literal-fs-filename -- false positive
!isNullOrUndefined(proto.send) &&
!isNullOrUndefined(proto.abort);
}
let ieVer = getIEVersion();
if (ieVer && ieVer < 9) {
result = false;
}
if (result) {
// Disable if the XmlHttpRequest can't be extended or hooked
try {
let xhr = new XMLHttpRequest();
xhr[strAjaxData] = {};
// Check that we can update the prototype
let theOpen = XMLHttpRequest[strPrototype].open;
XMLHttpRequest[strPrototype].open = theOpen;
} catch (e) {
// We can't decorate the xhr object so disable monitoring
result = false;
_throwInternalCritical(ajaxMonitorInstance,
_eInternalMessageId.FailedMonitorAjaxOpen,
"Failed to enable XMLHttpRequest monitoring, extension is not supported",
{
exception: dumpObj(e)
});
}
}
return result;
}
/** @Ignore */
function _getFailedAjaxDiagnosticsMessage(xhr: XMLHttpRequestInstrumented): string {
let result = "";
try {
if (xhr && xhr[strAjaxData] && xhr[strAjaxData].requestUrl) {
result += "(url: '" + xhr[strAjaxData].requestUrl + "')";
}
} catch (e) {
// eslint-disable-next-line no-empty
}
return result;
}
/** @ignore */
function _throwInternalCritical(ajaxMonitorInstance:AjaxMonitor, msgId: _eInternalMessageId, message: string, properties?: Object, isUserAct?: boolean): void {
_throwInternal(ajaxMonitorInstance[strDiagLog](), eLoggingSeverity.CRITICAL, msgId, message, properties, isUserAct);
}
/** @ignore */
function _throwInternalWarning(ajaxMonitorInstance:AjaxMonitor, msgId: _eInternalMessageId, message: string, properties?: Object, isUserAct?: boolean): void {
_throwInternal(ajaxMonitorInstance[strDiagLog](), eLoggingSeverity.WARNING, msgId, message, properties, isUserAct);
}
/** @Ignore */
function _createErrorCallbackFunc(ajaxMonitorInstance:AjaxMonitor, internalMessage: _eInternalMessageId, message:string) {
// tslint:disable-next-line
return function (args:IInstrumentCallDetails) {
_throwInternalCritical(ajaxMonitorInstance,
internalMessage,
message,
{
ajaxDiagnosticsMessage: _getFailedAjaxDiagnosticsMessage(args.inst),
exception: dumpObj(args.err)
});
};
}
function _indexOf(value:string, match:string):number {
if (value && match) {
return value.indexOf(match);
}
return -1;
}
function _addHandler<F>(container: _IInternalDependencyHandler<F>[], id: number, theFunc: F): IDependencyHandler {
let theHandler: _IInternalDependencyHandler<F> = {
id: id,
fn: theFunc
};
container.push(theHandler);
return {
remove: () => {
arrForEach(container, (initializer, idx) => {
if (initializer.id === theHandler.id) {
container.splice(idx, 1);
return -1;
}
});
}
};
}
function _processDependencyContainer<F extends Function, D>(core: IAppInsightsCore, container: _IInternalDependencyHandler<F>[], details: D, message: string) {
let result = true;
arrForEach(container, (theFunc, idx) => {
try {
if (theFunc.fn.call(null, details) === false) {
result = false;
}
} catch (e) {
_throwInternal(
core && core.logger,
eLoggingSeverity.CRITICAL,
_eInternalMessageId.TelemetryInitializerFailed,
"Dependency " + message + " [#" + idx + "] failed: " + getExceptionName(e),
{ exception: dumpObj(e) }, true);
}
});
return result;
}
function _processDependencyListeners(listeners: _IInternalDependencyHandler<DependencyListenerFunction>[], core: IAppInsightsCore, ajaxData: ajaxRecord, xhr: XMLHttpRequest, input?: Request | string, init?: RequestInit): void {
var initializersCount = listeners.length;
if (initializersCount > 0) {
let details: IDependencyListenerDetails = {
core: core,
xhr: xhr,
input: input,
init: init,
traceId: ajaxData.traceID,
spanId: ajaxData.spanID,
traceFlags: ajaxData.traceFlags,
context: ajaxData.context || {},
aborted: !!ajaxData.aborted
};
_processDependencyContainer(core, listeners, details, "listener");
ajaxData.traceID = details.traceId;
ajaxData.spanID = details.spanId;
ajaxData.traceFlags = details.traceFlags;
ajaxData.context = details.context;
}
}
export interface XMLHttpRequestInstrumented extends XMLHttpRequest {
ajaxData: ajaxRecord;
}
const BLOB_CORE = "*.blob.core.";
export const DfltAjaxCorrelationHeaderExDomains = deepFreeze([
BLOB_CORE + "windows.net",
BLOB_CORE + "chinacloudapi.cn",
BLOB_CORE + "cloudapi.de",
BLOB_CORE + "usgovcloudapi.net"
]);
const _internalExcludeEndpoints = [
/https:\/\/[^\/]*(\.pipe\.aria|aria\.pipe|events\.data|collector\.azure)\.[^\/]+\/(OneCollector\/1|Collector\/3)\.0/i
];
export interface IDependenciesPlugin extends IDependencyListenerContainer {
/**
* Logs dependency call
* @param dependencyData dependency data object
*/
trackDependencyData(dependency: IDependencyTelemetry): void;
}
export interface IInstrumentationRequirements extends IDependenciesPlugin {
includeCorrelationHeaders: (ajaxData: ajaxRecord, input?: Request | string, init?: RequestInit, xhr?: XMLHttpRequestInstrumented) => any;
}
function _getDefaultConfig(): ICorrelationConfig {
const config: ICorrelationConfig = {
maxAjaxCallsPerView: 500,
disableAjaxTracking: false,
disableFetchTracking: false,
excludeRequestFromAutoTrackingPatterns: undefined,
disableCorrelationHeaders: false,
distributedTracingMode: eDistributedTracingModes.AI_AND_W3C,
correlationHeaderExcludedDomains: DfltAjaxCorrelationHeaderExDomains,
correlationHeaderDomains: undefined,
correlationHeaderExcludePatterns: undefined,
appId: undefined,
enableCorsCorrelation: false,
enableRequestHeaderTracking: false,
enableResponseHeaderTracking: false,
enableAjaxErrorStatusText: false,
enableAjaxPerfTracking: false,
maxAjaxPerfLookupAttempts: 3,
ajaxPerfLookupDelay: 25,
ignoreHeaders:[
"Authorization",
"X-API-Key",
"WWW-Authenticate"],
addRequestContext: undefined,
addIntEndpoints: true
}
return config;
}
function _getEmptyConfig(): ICorrelationConfig {
let emptyConfig = _getDefaultConfig();
objForEachKey(emptyConfig, (value) => {
emptyConfig[value] = undefined;
});
return emptyConfig;
}
export class AjaxMonitor extends BaseTelemetryPlugin implements IDependenciesPlugin, IInstrumentationRequirements, IDependencyListenerContainer {
public static identifier: string = "AjaxDependencyPlugin";
public static getDefaultConfig = _getDefaultConfig;
public static getEmptyConfig = _getEmptyConfig;
public identifier: string = AjaxMonitor.identifier;
priority: number = 120;
constructor() {
super();
let _fetchInitialized: boolean; // fetch monitoring initialized
let _xhrInitialized: boolean; // XHR monitoring initialized
let _currentWindowHost: string;
let _config: ICorrelationConfig;
let _enableRequestHeaderTracking: boolean;
let _enableAjaxErrorStatusText: boolean;
let _trackAjaxAttempts: number;
let _context: ITelemetryContext;
let _isUsingW3CHeaders: boolean;
let _isUsingAIHeaders: boolean;
let _markPrefix: string;
let _enableAjaxPerfTracking: boolean;
let _maxAjaxCallsPerView: number;
let _enableResponseHeaderTracking: boolean;
let _disabledUrls: any;
let _disableAjaxTracking: boolean;
let _disableFetchTracking: boolean;
let _excludeRequestFromAutoTrackingPatterns: (string | RegExp)[];
let _addRequestContext: (requestContext?: IRequestContext) => ICustomProperties;
let _evtNamespace: string | string[];
let _dependencyHandlerId: number;
let _dependencyListeners: _IInternalDependencyHandler<DependencyListenerFunction>[];
let _dependencyInitializers: _IInternalDependencyHandler<DependencyInitializerFunction>[];
dynamicProto(AjaxMonitor, this, (_self, _base) => {
let _addHook = _base._addHook;
_initDefaults();
_self.initialize = (config: IConfiguration & IConfig, core: IAppInsightsCore, extensions: IPlugin[], pluginChain?:ITelemetryPluginChain) => {
if (!_self.isInitialized()) {
_base.initialize(config, core, extensions, pluginChain);
_evtNamespace = mergeEvtNamespace(createUniqueNamespace("ajax"), core && core.evtNamespace && core.evtNamespace());
_populateDefaults(config);
_instrumentXhr();
_instrumentFetch();
_populateContext();
}
};
_self._doTeardown = () => {
_initDefaults();
};
_self.trackDependencyData = (dependency: IDependencyTelemetry, properties?: { [key: string]: any }) => {
_reportDependencyInternal(_dependencyInitializers, _self.core, null, dependency, properties);
}
_self.includeCorrelationHeaders = (ajaxData: ajaxRecord, input?: Request | string, init?: RequestInit, xhr?: XMLHttpRequestInstrumented): any => {
// Test Hook to allow the overriding of the location host
let currentWindowHost = _self["_currentWindowHost"] || _currentWindowHost;
_processDependencyListeners(_dependencyListeners, _self.core, ajaxData, xhr, input, init);
if (input) { // Fetch
if (CorrelationIdHelper.canIncludeCorrelationHeader(_config, ajaxData.getAbsoluteUrl(), currentWindowHost)) {
if (!init) {
init = {};
}
// init headers override original request headers
// so, if they exist use only them, otherwise use request's because they should have been applied in the first place
// not using original request headers will result in them being lost
let headers = new Headers(init.headers || (input instanceof Request ? (input.headers || {}) : {}));
if (_isUsingAIHeaders) {
const id = "|" + ajaxData.traceID + "." + ajaxData.spanID;
headers.set(RequestHeaders[eRequestHeaders.requestIdHeader], id);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.requestIdHeader]] = id;
}
}
const appId: string = _config.appId ||(_context && _context.appId());
if (appId) {
headers.set(RequestHeaders[eRequestHeaders.requestContextHeader], RequestHeaders[eRequestHeaders.requestContextAppIdFormat] + appId);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.requestContextHeader]] = RequestHeaders[eRequestHeaders.requestContextAppIdFormat] + appId;
}
}
if (_isUsingW3CHeaders) {
let traceFlags = ajaxData.traceFlags;
if (isNullOrUndefined(traceFlags)) {
traceFlags = 0x01;
}
const traceParent = formatTraceParent(createTraceParent(ajaxData.traceID, ajaxData.spanID, traceFlags));
headers.set(RequestHeaders[eRequestHeaders.traceParentHeader], traceParent);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.traceParentHeader]] = traceParent;
}
}
init.headers = headers;
}
return init;
} else if (xhr) { // XHR
if (CorrelationIdHelper.canIncludeCorrelationHeader(_config, ajaxData.getAbsoluteUrl(), currentWindowHost)) {
if (_isUsingAIHeaders) {
const id = "|" + ajaxData.traceID + "." + ajaxData.spanID;
xhr.setRequestHeader(RequestHeaders[eRequestHeaders.requestIdHeader], id);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.requestIdHeader]] = id;
}
}
const appId = _config.appId || (_context && _context.appId());
if (appId) {
xhr.setRequestHeader(RequestHeaders[eRequestHeaders.requestContextHeader], RequestHeaders[eRequestHeaders.requestContextAppIdFormat] + appId);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.requestContextHeader]] = RequestHeaders[eRequestHeaders.requestContextAppIdFormat] + appId;
}
}
if (_isUsingW3CHeaders) {
let traceFlags = ajaxData.traceFlags;
if (isNullOrUndefined(traceFlags)) {
traceFlags = 0x01;
}
const traceParent = formatTraceParent(createTraceParent(ajaxData.traceID, ajaxData.spanID, traceFlags));
xhr.setRequestHeader(RequestHeaders[eRequestHeaders.traceParentHeader], traceParent);
if (_enableRequestHeaderTracking) {
ajaxData.requestHeaders[RequestHeaders[eRequestHeaders.traceParentHeader]] = traceParent;
}
}
}
return xhr;
}
return undefined;
}
_self.trackDependencyDataInternal = (dependency: IDependencyTelemetry, properties?: { [key: string]: any }, systemProperties?: { [key: string]: any }) => {
if (_maxAjaxCallsPerView === -1 || _trackAjaxAttempts < _maxAjaxCallsPerView) {
// Hack since expected format in w3c mode is |abc.def.
// Non-w3c format is |abc.def
// @todo Remove if better solution is available, e.g. handle in portal
if ((_config.distributedTracingMode === eDistributedTracingModes.W3C
|| _config.distributedTracingMode === eDistributedTracingModes.AI_AND_W3C)
&& typeof dependency.id === "string" && dependency.id[dependency.id.length - 1] !== "."
) {
dependency.id += ".";
}
if (isNullOrUndefined(dependency.startTime)) {
dependency.startTime = new Date();
}
const item = createTelemetryItem<IDependencyTelemetry>(
dependency,
RemoteDependencyData.dataType,
RemoteDependencyData.envelopeType,
_self[strDiagLog](),
properties,
systemProperties);
_self.core.track(item);
} else if (_trackAjaxAttempts === _maxAjaxCallsPerView) {
_throwInternalCritical(_self,
_eInternalMessageId.MaxAjaxPerPVExceeded,
"Maximum ajax per page view limit reached, ajax monitoring is paused until the next trackPageView(). In order to increase the limit set the maxAjaxCallsPerView configuration parameter.",
true);
}
++_trackAjaxAttempts;
}
_self.addDependencyListener = (dependencyListener: DependencyListenerFunction): IDependencyListenerHandler => {
return _addHandler(_dependencyListeners, _dependencyHandlerId++, dependencyListener);
};
_self.addDependencyInitializer = (dependencyInitializer: DependencyInitializerFunction): IDependencyInitializerHandler => {
return _addHandler(_dependencyInitializers, _dependencyHandlerId++, dependencyInitializer);
};
function _initDefaults() {
let location = getLocation();
_fetchInitialized = false; // fetch monitoring initialized
_xhrInitialized = false; // XHR monitoring initialized
_currentWindowHost = location && location.host && location.host.toLowerCase();
_config = AjaxMonitor.getEmptyConfig();
_enableRequestHeaderTracking = false;
_enableAjaxErrorStatusText = false;
_trackAjaxAttempts = 0;
_context = null;
_isUsingW3CHeaders = false;
_isUsingAIHeaders = false;
_markPrefix = null;
_enableAjaxPerfTracking = false;
_maxAjaxCallsPerView = 0;
_enableResponseHeaderTracking = false;
_disabledUrls = {};
_disableAjaxTracking = false;
_disableFetchTracking = false;
_excludeRequestFromAutoTrackingPatterns = null;
_addRequestContext = null;
_evtNamespace = null;
_dependencyHandlerId = 0;
_dependencyListeners = [];
_dependencyInitializers = [];
}
function _populateDefaults(config: IConfiguration) {
let ctx = createProcessTelemetryContext(null, config, _self.core);
// Reset to the empty config
_config = _getEmptyConfig();
const defaultConfig = _getDefaultConfig();
objForEachKey(defaultConfig, (field, value) => {
_config[field] = ctx.getConfig(AjaxMonitor.identifier, field, value);
});
let distributedTracingMode = _config.distributedTracingMode;
_enableRequestHeaderTracking = _config.enableRequestHeaderTracking;
_enableAjaxErrorStatusText = _config.enableAjaxErrorStatusText;
_enableAjaxPerfTracking = _config.enableAjaxPerfTracking;
_maxAjaxCallsPerView = _config.maxAjaxCallsPerView;
_enableResponseHeaderTracking = _config.enableResponseHeaderTracking;
_excludeRequestFromAutoTrackingPatterns = [].concat(_config.excludeRequestFromAutoTrackingPatterns || [], _config.addIntEndpoints !== false ? _internalExcludeEndpoints : []);
_addRequestContext = _config.addRequestContext;
_isUsingAIHeaders = distributedTracingMode === eDistributedTracingModes.AI || distributedTracingMode === eDistributedTracingModes.AI_AND_W3C;
_isUsingW3CHeaders = distributedTracingMode === eDistributedTracingModes.AI_AND_W3C || distributedTracingMode === eDistributedTracingModes.W3C;
if (_enableAjaxPerfTracking) {
let iKey = config.instrumentationKey || "unkwn";
if (iKey.length > 5) {
_markPrefix = AJAX_MONITOR_PREFIX + iKey.substring(iKey.length - 5) + ".";
} else {
_markPrefix = AJAX_MONITOR_PREFIX + iKey + ".";
}
}
_disableAjaxTracking = !!_config.disableAjaxTracking;
_disableFetchTracking = !!_config.disableFetchTracking;
}
function _populateContext() {
let propExt = _self.core.getPlugin<any>(PropertiesPluginIdentifier);
if (propExt) {
_context = propExt.plugin.context; // we could move IPropertiesPlugin to common as well
}
}
// discard the header if it's defined as ignoreHeaders in ICorrelationConfig
function _canIncludeHeaders(header: string) {
let rlt = true;
if (header || _config.ignoreHeaders) {
arrForEach(_config.ignoreHeaders,(key => {
if (key.toLowerCase() === header.toLowerCase()) {
rlt = false;
return -1;
}
}))
}
return rlt;
}
// Fetch Stuff
function _instrumentFetch(): void {
let fetch = _supportsFetch();
if (!fetch) {
return;
}
let global = getGlobal();
let isPolyfill = (fetch as any).polyfill;
if (!_disableFetchTracking && !_fetchInitialized) {
_addHook(InstrumentFunc(global, STR_FETCH, {
ns: _evtNamespace,
// Add request hook
req: (callDetails: IInstrumentCallDetails, input, init) => {
let fetchData: ajaxRecord;
if (!_disableFetchTracking && _fetchInitialized &&
!_isDisabledRequest(null, input, init) &&
// If we have a polyfil and XHR instrumented then let XHR report otherwise we get duplicates
!(isPolyfill && _xhrInitialized)) {
let ctx = callDetails.ctx();
fetchData = _createFetchRecord(input, init);
let newInit = _self.includeCorrelationHeaders(fetchData, input, init);
if (newInit !== init) {
callDetails.set(1, newInit);
}
ctx.data = fetchData;
}
},
rsp: (callDetails: IInstrumentCallDetails, input) => {
if (!_disableFetchTracking) {
let fetchData = callDetails.ctx().data;
if (fetchData) {
// Replace the result with the new promise from this code
callDetails.rslt = callDetails.rslt.then((response: any) => {
_reportFetchMetrics(callDetails, (response||{}).status, input, response, fetchData, () => {
let ajaxResponse:IAjaxRecordResponse = {
statusText: (response||{}).statusText,
headerMap: null,
correlationContext: _getFetchCorrelationContext(response)
};
if (_enableResponseHeaderTracking && response) {
const responseHeaderMap = {};
response.headers.forEach((value: string, name: string) => { // @skip-minify
if (_canIncludeHeaders(name)) {
responseHeaderMap[name] = value;
}
});
ajaxResponse.headerMap = responseHeaderMap;
}
return ajaxResponse;
});
return response;
})
.catch((reason: any) => {
_reportFetchMetrics(callDetails, 0, input, null, fetchData, null, { error: reason.message || dumpObj(reason) });
throw reason;
});
}
}
},
// Create an error callback to report any hook errors
hkErr: _createErrorCallbackFunc(_self, _eInternalMessageId.FailedMonitorAjaxOpen,
"Failed to monitor Window.fetch" + ERROR_POSTFIX)
}));
_fetchInitialized = true;
} else if (isPolyfill) {
// If fetch is a polyfill we need to capture the request to ensure that we correctly track
// disabled request URLS (i.e. internal urls) to ensure we don't end up in a constant loop
// of reporting ourselves, for example React Native uses a polyfill for fetch
// Note: Polyfill implementations that don't support the "poyyfill" tag are not supported
// the workaround is to add a polyfill property to your fetch implementation before initializing
// App Insights
_addHook(InstrumentFunc(global, STR_FETCH, {
ns: _evtNamespace,
req: (callDetails: IInstrumentCallDetails, input, init) => {
// Just call so that we record any disabled URL
_isDisabledRequest(null, input, init);
}
}));
}
if (isPolyfill) {
// retag the instrumented fetch with the same polyfill settings this is mostly for testing
// But also supports multiple App Insights usages
(global[STR_FETCH] as any).polyfill = isPolyfill;
}
}
function _hookProto(target: any, funcName: string, callbacks: IInstrumentHooksCallbacks) {
_addHook(InstrumentProto(target, funcName, callbacks));
}
function _instrumentXhr():void {
if (_supportsAjaxMonitoring(_self) && !_disableAjaxTracking && !_xhrInitialized) {
// Instrument open
_hookProto(XMLHttpRequest, "open", {
ns: _evtNamespace,
req: (args:IInstrumentCallDetails, method:string, url:string, async?:boolean) => {
if (!_disableAjaxTracking) {
let xhr = args.inst as XMLHttpRequestInstrumented;
let ajaxData = xhr[strAjaxData];
if (!_isDisabledRequest(xhr, url) && _isMonitoredXhrInstance(xhr, true)) {
if (!ajaxData || !ajaxData.xhrMonitoringState.openDone) {
// Only create a single ajaxData (even when multiple AI instances are running)
_openHandler(xhr, method, url, async);
}
// always attach to the on ready state change (required for handling multiple instances)
_attachToOnReadyStateChange(xhr);
}
}
},
hkErr: _createErrorCallbackFunc(_self, _eInternalMessageId.FailedMonitorAjaxOpen,
ERROR_HEADER + ".open" + ERROR_POSTFIX)
});
// Instrument send
_hookProto(XMLHttpRequest, "send", {
ns: _evtNamespace,
req: (args:IInstrumentCallDetails, context?: Document | BodyInit | null) => {
if (!_disableAjaxTracking) {
let xhr = args.inst as XMLHttpRequestInstrumented;
let ajaxData = xhr[strAjaxData];
if (_isMonitoredXhrInstance(xhr) && !ajaxData.xhrMonitoringState.sendDone) {
_createMarkId("xhr", ajaxData);
ajaxData.requestSentTime = dateTimeUtilsNow();
_self.includeCorrelationHeaders(ajaxData, undefined, undefined, xhr);
ajaxData.xhrMonitoringState.sendDone = true;
}
}
},
hkErr: _createErrorCallbackFunc(_self, _eInternalMessageId.FailedMonitorAjaxSend,
ERROR_HEADER + ERROR_POSTFIX)
});
// Instrument abort
_hookProto(XMLHttpRequest, "abort", {
ns: _evtNamespace,
req: (args:IInstrumentCallDetails) => {
if (!_disableAjaxTracking) {
let xhr = args.inst as XMLHttpRequestInstrumented;
let ajaxData = xhr[strAjaxData];
if (_isMonitoredXhrInstance(xhr) && !ajaxData.xhrMonitoringState.abortDone) {
ajaxData.aborted = 1;
ajaxData.xhrMonitoringState.abortDone = true;
}
}
},
hkErr: _createErrorCallbackFunc(_self, _eInternalMessageId.FailedMonitorAjaxAbort,
ERROR_HEADER + ".abort" + ERROR_POSTFIX)
});
// Instrument setRequestHeader
_hookProto(XMLHttpRequest, "setRequestHeader", {
ns: _evtNamespace,
req: (args: IInstrumentCallDetails, header: string, value: string) => {
if (!_disableAjaxTracking && _enableRequestHeaderTracking) {
let xhr = args.inst as XMLHttpRequestInstrumented;
if (_isMonitoredXhrInstance(xhr) && _canIncludeHeaders(header)) {
xhr[strAjaxData].requestHeaders[header] = value;
}
}
},
hkErr: _createErrorCallbackFunc(_self, _eInternalMessageId.FailedMonitorAjaxSetRequestHeader,
ERROR_HEADER + ".setRequestHeader" + ERROR_POSTFIX)
});
_xhrInitialized = true;
}
}
function _isDisabledRequest(xhr?: XMLHttpRequestInstrumented, request?: Request | string, init?: RequestInit) {
let isDisabled = false;
let theUrl:string = ((!isString(request) ? ((request ||{}) as Request).url || "" : request as string) ||"").toLowerCase();
// check excludeRequestFromAutoTrackingPatterns before stripping off any query string
arrForEach(_excludeRequestFromAutoTrackingPatterns, (regex: string | RegExp) => {
let theRegex = regex;
if (isString(regex)) {
theRegex = new RegExp(regex);
}
if (!isDisabled) {
isDisabled = (theRegex as RegExp).test(theUrl);
}
});
// if request url matches with exclude regex pattern, return true and no need to check for headers
if (isDisabled) {
return isDisabled;
}
let idx = _indexOf(theUrl, "?");
let idx2 = _indexOf(theUrl, "#");
if (idx === -1 || (idx2 !== -1 && idx2 < idx)) {
idx = idx2;
}
if (idx !== -1) {
// Strip off any Query string
theUrl = theUrl.substring(0, idx);
}
// check that this instance is not not used by ajax call performed inside client side monitoring to send data to collector
if (!isNullOrUndefined(xhr)) {
// Look on the XMLHttpRequest of the URL string value
isDisabled = xhr[DisabledPropertyName] === true || theUrl[DisabledPropertyName] === true;
} else if (!isNullOrUndefined(request)) { // fetch
// Look for DisabledPropertyName in either Request or RequestInit
isDisabled = (typeof request === "object" ? request[DisabledPropertyName] === true : false) ||
(init ? init[DisabledPropertyName] === true : false);
}
// Also add extra check just in case the XHR or fetch objects where not decorated with the DisableProperty due to sealing or freezing
if (!isDisabled && theUrl && isInternalApplicationInsightsEndpoint(theUrl)) {
isDisabled = true;
}
if (isDisabled) {
// Add the disabled url if not present
if (!_disabledUrls[theUrl]) {
_disabledUrls[theUrl] = 1;
}
} else {
// Check to see if the url is listed as disabled
if (_disabledUrls[theUrl]) {
isDisabled = true;
}
}
return isDisabled;
}
/// <summary>Verifies that particalar instance of XMLHttpRequest needs to be monitored</summary>
/// <param name="excludeAjaxDataValidation">Optional parameter. True if ajaxData must be excluded from verification</param>
/// <returns type="bool">True if instance needs to be monitored, otherwise false</returns>
function _isMonitoredXhrInstance(xhr: XMLHttpRequestInstrumented, excludeAjaxDataValidation?: boolean): boolean {
let ajaxValidation = true;
let initialized = _xhrInitialized;
if (!isNullOrUndefined(xhr)) {
ajaxValidation = excludeAjaxDataValidation === true || !isNullOrUndefined(xhr[strAjaxData]);
}
// checking to see that all interested functions on xhr were instrumented
return initialized
// checking on ajaxData to see that it was not removed in user code
&& ajaxValidation;
}
function _getDistributedTraceCtx(): IDistributedTraceContext {
let distributedTraceCtx: IDistributedTraceContext = null;
if (_self.core && _self.core.getTraceCtx) {
distributedTraceCtx = _self.core.getTraceCtx(false);
}
// Fall back
if (!distributedTraceCtx && _context && _context.telemetryTrace) {
distributedTraceCtx = createDistributedTraceContextFromTrace(_context.telemetryTrace);
}
return distributedTraceCtx;
}
function _openHandler(xhr: XMLHttpRequestInstrumented, method: string, url: string, async: boolean) {
let distributedTraceCtx: IDistributedTraceContext = _getDistributedTraceCtx();
const traceID = (distributedTraceCtx && distributedTraceCtx.getTraceId()) || generateW3CId();
const spanID = generateW3CId().substr(0, 16);
const ajaxData = new ajaxRecord(traceID, spanID, _self[strDiagLog](), _self.core?.getTraceCtx());
ajaxData.traceFlags = distributedTraceCtx && distributedTraceCtx.getTraceFlags();
ajaxData.method = method;
ajaxData.requestUrl = url;
ajaxData.xhrMonitoringState.openDone = true;
ajaxData.requestHeaders = {};
ajaxData.async = async;
ajaxData.errorStatusText = _enableAjaxErrorStatusText;
xhr[strAjaxData] = ajaxData;
}
function _attachToOnReadyStateChange(xhr: XMLHttpRequestInstrumented) {
xhr[strAjaxData].xhrMonitoringState.stateChangeAttached = eventOn(xhr, "readystatechange", () => {
try {
if (xhr && xhr.readyState === 4 && _isMonitoredXhrInstance(xhr)) {
_onAjaxComplete(xhr);
}
} catch (e) {
const exceptionText = dumpObj(e);
// ignore messages with c00c023f, as this a known IE9 XHR abort issue
if (!exceptionText || _indexOf(exceptionText.toLowerCase(), "c00c023f") === -1) {
_throwInternalCritical(_self,
_eInternalMessageId.FailedMonitorAjaxRSC,
ERROR_HEADER + " 'readystatechange' event handler" + ERROR_POSTFIX,
{
ajaxDiagnosticsMessage: _getFailedAjaxDiagnosticsMessage(xhr),
exception: exceptionText
});
}
}
}, _evtNamespace);
}
function _getResponseText(xhr: XMLHttpRequestInstrumented) {
try {
const responseType = xhr.responseType;
if (responseType === "" || responseType === "text") {
// As per the specification responseText is only valid if the type is an empty string or "text"
return xhr.responseText;
}
} catch (e) {
// This shouldn't happen because of the above check -- but just in case, so just ignore
}
return null;
}
function _onAjaxComplete(xhr: XMLHttpRequestInstrumented) {
let ajaxData = xhr[strAjaxData];
ajaxData.responseFinishedTime = dateTimeUtilsNow();
ajaxData.status = xhr.status;
function _reportXhrError(e: any, failedProps?:Object) {
let errorProps = failedProps||{};
errorProps["ajaxDiagnosticsMessage"] = _getFailedAjaxDiagnosticsMessage(xhr);
if (e) {
errorProps["exception"] = dumpObj(e);
}
_throwInternalWarning(_self,
_eInternalMessageId.FailedMonitorAjaxDur,
FAILED_TO_CALCULATE_DURATION_ERROR + "ajax call" + ERROR_NOT_SENT,
errorProps
);
}
_findPerfResourceEntry("xmlhttprequest", ajaxData, () => {
try {
const dependency = ajaxData.CreateTrackItem("Ajax", _enableRequestHeaderTracking, () => {
let ajaxResponse:IAjaxRecordResponse = {
statusText: xhr.statusText,
headerMap: null,
correlationContext: _getAjaxCorrelationContext(xhr),
type: xhr.responseType,
responseText: _getResponseText(xhr),
response: xhr.response
};
if (_enableResponseHeaderTracking) {
const headers = xhr.getAllResponseHeaders();
if (headers) {
// xhr.getAllResponseHeaders() method returns all the response headers, separated by CRLF, as a string or null
// the regex converts the header string into an array of individual headers
const arr = strTrim(headers).split(/[\r\n]+/);
const responseHeaderMap = {};
arrForEach(arr, (line) => {
const parts = line.split(": ");
const header = parts.shift();
const value = parts.join(": ");
if(_canIncludeHeaders(header)) {
responseHeaderMap[header] = value;
}
});
ajaxResponse.headerMap = responseHeaderMap;
}
}
return ajaxResponse;
});
let properties;
try {
if (!!_addRequestContext) {
properties = _addRequestContext({status: xhr.status, xhr});
}
} catch (e) {
_throwInternalWarning(_self,
_eInternalMessageId.FailedAddingCustomDefinedRequestContext,
CUSTOM_REQUEST_CONTEXT_ERROR);
}
if (dependency) {
if (properties !== undefined) {
dependency.properties = {...dependency.properties, ...properties};
}
let sysProperties = ajaxData.getPartAProps();
_reportDependencyInternal(_dependencyInitializers, _self.core, ajaxData, dependency, null, sysProperties);
} else {
_reportXhrError(null, {
requestSentTime: ajaxData.requestSentTime,
responseFinishedTime: ajaxData.responseFinishedTime
});
}
} finally {
// cleanup telemetry data
try {
xhr[strAjaxData] = null;
} catch (e) {
// May throw in environments that prevent extension or freeze xhr
}
}
}, (e) => {
_reportXhrError(e, null);
});
}
function _getAjaxCorrelationContext(xhr: XMLHttpRequestInstrumented) {
try {
const responseHeadersString = xhr.getAllResponseHeaders();
if (responseHeadersString !== null) {
const index = _indexOf(responseHeadersString.toLowerCase(), RequestHeaders[eRequestHeaders.requestContextHeaderLowerCase]);
if (index !== -1) {
const responseHeader = xhr.getResponseHeader(RequestHeaders[eRequestHeaders.requestContextHeader]);
return CorrelationIdHelper.getCorrelationContext(responseHeader);
}
}
} catch (e) {
_throwInternalWarning(_self,
_eInternalMessageId.FailedMonitorAjaxGetCorrelationHeader,
CORRELATION_HEADER_ERROR,
{
ajaxDiagnosticsMessage: _getFailedAjaxDiagnosticsMessage(xhr),
exception: dumpObj(e)
});
}
}
function _createMarkId(type:string, ajaxData:ajaxRecord) {
if (ajaxData.requestUrl && _markPrefix && _enableAjaxPerfTracking) {
let performance = getPerformance();
if (performance && isFunction(performance.mark)) {
_markCount++;
let markId = _markPrefix + type + "#" + _markCount;
performance.mark(markId);
let entries = performance.getEntriesByName(markId);
if (entries && entries.length === 1) {
ajaxData.perfMark = entries[0] as any;
}
}
}
}