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Diffstat (limited to 'dom/performance/PerformanceTiming.cpp')
| -rw-r--r-- | dom/performance/PerformanceTiming.cpp | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/dom/performance/PerformanceTiming.cpp b/dom/performance/PerformanceTiming.cpp new file mode 100644 index 0000000000..546783d686 --- /dev/null +++ b/dom/performance/PerformanceTiming.cpp @@ -0,0 +1,677 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "PerformanceTiming.h" +#include "mozilla/BasePrincipal.h" +#include "mozilla/dom/PerformanceTimingBinding.h" +#include "mozilla/StaticPrefs_dom.h" +#include "mozilla/Telemetry.h" +#include "nsIDocShell.h" +#include "nsIDocShellTreeItem.h" +#include "nsIHttpChannel.h" +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/dom/Document.h" +#include "nsITimedChannel.h" + +namespace mozilla::dom { + +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(PerformanceTiming, mPerformance) + +/* static */ +PerformanceTimingData* PerformanceTimingData::Create( + nsITimedChannel* aTimedChannel, nsIHttpChannel* aChannel, + DOMHighResTimeStamp aZeroTime, nsAString& aInitiatorType, + nsAString& aEntryName) { + MOZ_ASSERT(NS_IsMainThread()); + + // Check if resource timing is prefed off. + if (!StaticPrefs::dom_enable_resource_timing()) { + return nullptr; + } + + if (!aChannel || !aTimedChannel) { + return nullptr; + } + + bool reportTiming = true; + aTimedChannel->GetReportResourceTiming(&reportTiming); + + if (!reportTiming) { + return nullptr; + } + + aTimedChannel->GetInitiatorType(aInitiatorType); + + // If the initiator type had no valid value, then set it to the default + // ("other") value. + if (aInitiatorType.IsEmpty()) { + aInitiatorType = u"other"_ns; + } + + // According to the spec, "The name attribute must return the resolved URL + // of the requested resource. This attribute must not change even if the + // fetch redirected to a different URL." + nsCOMPtr<nsIURI> originalURI; + aChannel->GetOriginalURI(getter_AddRefs(originalURI)); + + nsAutoCString name; + originalURI->GetSpec(name); + CopyUTF8toUTF16(name, aEntryName); + + // The nsITimedChannel argument will be used to gather all the timings. + // The nsIHttpChannel argument will be used to check if any cross-origin + // redirects occurred. + // The last argument is the "zero time" (offset). Since we don't want + // any offset for the resource timing, this will be set to "0" - the + // resource timing returns a relative timing (no offset). + return new PerformanceTimingData(aTimedChannel, aChannel, 0); +} + +PerformanceTiming::PerformanceTiming(Performance* aPerformance, + nsITimedChannel* aChannel, + nsIHttpChannel* aHttpChannel, + DOMHighResTimeStamp aZeroTime) + : mPerformance(aPerformance) { + MOZ_ASSERT(aPerformance, "Parent performance object should be provided"); + + mTimingData.reset(new PerformanceTimingData( + aChannel, aHttpChannel, + nsRFPService::ReduceTimePrecisionAsMSecs( + aZeroTime, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()))); + + // Non-null aHttpChannel implies that this PerformanceTiming object is being + // used for subresources, which is irrelevant to this probe. + if (!aHttpChannel && StaticPrefs::dom_enable_performance() && + IsTopLevelContentDocument()) { + glean::performance_time::response_start.AccumulateRawDuration( + TimeDuration::FromMilliseconds( + mTimingData->ResponseStartHighRes(aPerformance) - + mTimingData->ZeroTime())); + } +} + +// Copy the timing info from the channel so we don't need to keep the channel +// alive just to get the timestamps. +PerformanceTimingData::PerformanceTimingData(nsITimedChannel* aChannel, + nsIHttpChannel* aHttpChannel, + DOMHighResTimeStamp aZeroTime) + : mZeroTime(0.0), + mFetchStart(0.0), + mEncodedBodySize(0), + mTransferSize(0), + mDecodedBodySize(0), + mRedirectCount(0), + mAllRedirectsSameOrigin(true), + mAllRedirectsPassTAO(true), + mSecureConnection(false), + mTimingAllowed(true), + mInitialized(false) { + mInitialized = !!aChannel; + mZeroTime = aZeroTime; + + if (!StaticPrefs::dom_enable_performance()) { + mZeroTime = 0; + } + + nsCOMPtr<nsIURI> uri; + if (aHttpChannel) { + aHttpChannel->GetURI(getter_AddRefs(uri)); + } else { + nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aChannel); + if (httpChannel) { + httpChannel->GetURI(getter_AddRefs(uri)); + } + } + + if (uri) { + mSecureConnection = uri->SchemeIs("https"); + } + + if (aChannel) { + aChannel->GetAsyncOpen(&mAsyncOpen); + aChannel->GetAllRedirectsSameOrigin(&mAllRedirectsSameOrigin); + aChannel->GetAllRedirectsPassTimingAllowCheck(&mAllRedirectsPassTAO); + aChannel->GetRedirectCount(&mRedirectCount); + aChannel->GetRedirectStart(&mRedirectStart); + aChannel->GetRedirectEnd(&mRedirectEnd); + aChannel->GetDomainLookupStart(&mDomainLookupStart); + aChannel->GetDomainLookupEnd(&mDomainLookupEnd); + aChannel->GetConnectStart(&mConnectStart); + aChannel->GetSecureConnectionStart(&mSecureConnectionStart); + aChannel->GetConnectEnd(&mConnectEnd); + aChannel->GetRequestStart(&mRequestStart); + aChannel->GetResponseStart(&mResponseStart); + aChannel->GetCacheReadStart(&mCacheReadStart); + aChannel->GetResponseEnd(&mResponseEnd); + aChannel->GetCacheReadEnd(&mCacheReadEnd); + + aChannel->GetDispatchFetchEventStart(&mWorkerStart); + aChannel->GetHandleFetchEventStart(&mWorkerRequestStart); + // TODO: Track when FetchEvent.respondWith() promise resolves as + // ServiceWorker interception responseStart? + aChannel->GetHandleFetchEventEnd(&mWorkerResponseEnd); + + // The performance timing api essentially requires that the event timestamps + // have a strict relation with each other. The truth, however, is the + // browser engages in a number of speculative activities that sometimes mean + // connections and lookups begin at different times. Workaround that here by + // clamping these values to what we expect FetchStart to be. This means the + // later of AsyncOpen or WorkerStart times. + if (!mAsyncOpen.IsNull()) { + // We want to clamp to the expected FetchStart value. This is later of + // the AsyncOpen and WorkerStart values. + const TimeStamp* clampTime = &mAsyncOpen; + if (!mWorkerStart.IsNull() && mWorkerStart > mAsyncOpen) { + clampTime = &mWorkerStart; + } + + if (!mDomainLookupStart.IsNull() && mDomainLookupStart < *clampTime) { + mDomainLookupStart = *clampTime; + } + + if (!mDomainLookupEnd.IsNull() && mDomainLookupEnd < *clampTime) { + mDomainLookupEnd = *clampTime; + } + + if (!mConnectStart.IsNull() && mConnectStart < *clampTime) { + mConnectStart = *clampTime; + } + + if (mSecureConnection && !mSecureConnectionStart.IsNull() && + mSecureConnectionStart < *clampTime) { + mSecureConnectionStart = *clampTime; + } + + if (!mConnectEnd.IsNull() && mConnectEnd < *clampTime) { + mConnectEnd = *clampTime; + } + } + } + + // The aHttpChannel argument is null if this PerformanceTiming object is + // being used for navigation timing (which is only relevant for documents). + // It has a non-null value if this PerformanceTiming object is being used + // for resource timing, which can include document loads, both toplevel and + // in subframes, and resources linked from a document. + if (aHttpChannel) { + SetPropertiesFromHttpChannel(aHttpChannel, aChannel); + } +} + +PerformanceTimingData::PerformanceTimingData( + const IPCPerformanceTimingData& aIPCData) + : mNextHopProtocol(aIPCData.nextHopProtocol()), + mAsyncOpen(aIPCData.asyncOpen()), + mRedirectStart(aIPCData.redirectStart()), + mRedirectEnd(aIPCData.redirectEnd()), + mDomainLookupStart(aIPCData.domainLookupStart()), + mDomainLookupEnd(aIPCData.domainLookupEnd()), + mConnectStart(aIPCData.connectStart()), + mSecureConnectionStart(aIPCData.secureConnectionStart()), + mConnectEnd(aIPCData.connectEnd()), + mRequestStart(aIPCData.requestStart()), + mResponseStart(aIPCData.responseStart()), + mCacheReadStart(aIPCData.cacheReadStart()), + mResponseEnd(aIPCData.responseEnd()), + mCacheReadEnd(aIPCData.cacheReadEnd()), + mWorkerStart(aIPCData.workerStart()), + mWorkerRequestStart(aIPCData.workerRequestStart()), + mWorkerResponseEnd(aIPCData.workerResponseEnd()), + mZeroTime(aIPCData.zeroTime()), + mFetchStart(aIPCData.fetchStart()), + mEncodedBodySize(aIPCData.encodedBodySize()), + mTransferSize(aIPCData.transferSize()), + mDecodedBodySize(aIPCData.decodedBodySize()), + mRedirectCount(aIPCData.redirectCount()), + mAllRedirectsSameOrigin(aIPCData.allRedirectsSameOrigin()), + mAllRedirectsPassTAO(aIPCData.allRedirectsPassTAO()), + mSecureConnection(aIPCData.secureConnection()), + mTimingAllowed(aIPCData.timingAllowed()), + mInitialized(aIPCData.initialized()) { + for (const auto& serverTimingData : aIPCData.serverTiming()) { + RefPtr<nsServerTiming> timing = new nsServerTiming(); + timing->SetName(serverTimingData.name()); + timing->SetDuration(serverTimingData.duration()); + timing->SetDescription(serverTimingData.description()); + mServerTiming.AppendElement(timing); + } +} + +IPCPerformanceTimingData PerformanceTimingData::ToIPC() { + nsTArray<IPCServerTiming> ipcServerTiming; + for (auto& serverTimingData : mServerTiming) { + nsAutoCString name; + Unused << serverTimingData->GetName(name); + double duration = 0; + Unused << serverTimingData->GetDuration(&duration); + nsAutoCString description; + Unused << serverTimingData->GetDescription(description); + ipcServerTiming.AppendElement(IPCServerTiming(name, duration, description)); + } + return IPCPerformanceTimingData( + ipcServerTiming, mNextHopProtocol, mAsyncOpen, mRedirectStart, + mRedirectEnd, mDomainLookupStart, mDomainLookupEnd, mConnectStart, + mSecureConnectionStart, mConnectEnd, mRequestStart, mResponseStart, + mCacheReadStart, mResponseEnd, mCacheReadEnd, mWorkerStart, + mWorkerRequestStart, mWorkerResponseEnd, mZeroTime, mFetchStart, + mEncodedBodySize, mTransferSize, mDecodedBodySize, mRedirectCount, + mAllRedirectsSameOrigin, mAllRedirectsPassTAO, mSecureConnection, + mTimingAllowed, mInitialized); +} + +void PerformanceTimingData::SetPropertiesFromHttpChannel( + nsIHttpChannel* aHttpChannel, nsITimedChannel* aChannel) { + MOZ_ASSERT(aHttpChannel); + + nsAutoCString protocol; + Unused << aHttpChannel->GetProtocolVersion(protocol); + CopyUTF8toUTF16(protocol, mNextHopProtocol); + + Unused << aHttpChannel->GetEncodedBodySize(&mEncodedBodySize); + Unused << aHttpChannel->GetTransferSize(&mTransferSize); + Unused << aHttpChannel->GetDecodedBodySize(&mDecodedBodySize); + if (mDecodedBodySize == 0) { + mDecodedBodySize = mEncodedBodySize; + } + + mTimingAllowed = CheckAllowedOrigin(aHttpChannel, aChannel); + aChannel->GetAllRedirectsPassTimingAllowCheck(&mAllRedirectsPassTAO); + + aChannel->GetNativeServerTiming(mServerTiming); +} + +PerformanceTiming::~PerformanceTiming() = default; + +DOMHighResTimeStamp PerformanceTimingData::FetchStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!mFetchStart) { + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + MOZ_ASSERT(!mAsyncOpen.IsNull(), + "The fetch start time stamp should always be " + "valid if the performance timing is enabled"); + if (!mAsyncOpen.IsNull()) { + if (!mWorkerRequestStart.IsNull() && mWorkerRequestStart > mAsyncOpen) { + mFetchStart = TimeStampToDOMHighRes(aPerformance, mWorkerRequestStart); + } else { + mFetchStart = TimeStampToDOMHighRes(aPerformance, mAsyncOpen); + } + } + } + return nsRFPService::ReduceTimePrecisionAsMSecs( + mFetchStart, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::FetchStart() { + return static_cast<int64_t>(mTimingData->FetchStartHighRes(mPerformance)); +} + +bool PerformanceTimingData::CheckAllowedOrigin(nsIHttpChannel* aResourceChannel, + nsITimedChannel* aChannel) { + if (!IsInitialized()) { + return false; + } + + // Check that the current document passes the ckeck. + nsCOMPtr<nsILoadInfo> loadInfo = aResourceChannel->LoadInfo(); + + // TYPE_DOCUMENT loads have no loadingPrincipal. + if (loadInfo->GetExternalContentPolicyType() == + ExtContentPolicy::TYPE_DOCUMENT) { + return true; + } + + nsCOMPtr<nsIPrincipal> principal = loadInfo->GetLoadingPrincipal(); + + // Check if the resource is either same origin as the page that started + // the load, or if the response contains the proper Timing-Allow-Origin + // header with the domain of the page that started the load. + return aChannel->TimingAllowCheck(principal); +} + +uint8_t PerformanceTimingData::GetRedirectCount() const { + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return 0; + } + if (!mAllRedirectsSameOrigin) { + return 0; + } + return mRedirectCount; +} + +bool PerformanceTimingData::ShouldReportCrossOriginRedirect( + bool aEnsureSameOriginAndIgnoreTAO) const { + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return false; + } + + if (!mTimingAllowed || mRedirectCount == 0) { + return false; + } + + // If the redirect count is 0, or if one of the cross-origin + // redirects doesn't have the proper Timing-Allow-Origin header, + // then RedirectStart and RedirectEnd will be set to zero + return aEnsureSameOriginAndIgnoreTAO ? mAllRedirectsSameOrigin + : mAllRedirectsPassTAO; +} + +DOMHighResTimeStamp PerformanceTimingData::AsyncOpenHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized() || + mAsyncOpen.IsNull()) { + return mZeroTime; + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mAsyncOpen); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMHighResTimeStamp PerformanceTimingData::WorkerStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized() || + mWorkerStart.IsNull()) { + return mZeroTime; + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mWorkerStart); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +/** + * RedirectStartHighRes() is used by both the navigation timing and the + * resource timing. Since, navigation timing and resource timing check and + * interpret cross-domain redirects in a different manner, + * RedirectStartHighRes() will make no checks for cross-domain redirect. + * It's up to the consumers of this method (PerformanceTiming::RedirectStart() + * and PerformanceResourceTiming::RedirectStart() to make such verifications. + * + * @return a valid timing if the Performance Timing is enabled + */ +DOMHighResTimeStamp PerformanceTimingData::RedirectStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + return TimeStampToReducedDOMHighResOrFetchStart(aPerformance, mRedirectStart); +} + +DOMTimeMilliSec PerformanceTiming::RedirectStart() { + if (!mTimingData->IsInitialized()) { + return 0; + } + // We have to check if all the redirect URIs had the same origin (since there + // is no check in RedirectStartHighRes()) + if (mTimingData->AllRedirectsSameOrigin() && + mTimingData->RedirectCountReal()) { + return static_cast<int64_t>( + mTimingData->RedirectStartHighRes(mPerformance)); + } + return 0; +} + +/** + * RedirectEndHighRes() is used by both the navigation timing and the resource + * timing. Since, navigation timing and resource timing check and interpret + * cross-domain redirects in a different manner, RedirectEndHighRes() will make + * no checks for cross-domain redirect. It's up to the consumers of this method + * (PerformanceTiming::RedirectEnd() and + * PerformanceResourceTiming::RedirectEnd() to make such verifications. + * + * @return a valid timing if the Performance Timing is enabled + */ +DOMHighResTimeStamp PerformanceTimingData::RedirectEndHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + return TimeStampToReducedDOMHighResOrFetchStart(aPerformance, mRedirectEnd); +} + +DOMTimeMilliSec PerformanceTiming::RedirectEnd() { + if (!mTimingData->IsInitialized()) { + return 0; + } + // We have to check if all the redirect URIs had the same origin (since there + // is no check in RedirectEndHighRes()) + if (mTimingData->AllRedirectsSameOrigin() && + mTimingData->RedirectCountReal()) { + return static_cast<int64_t>(mTimingData->RedirectEndHighRes(mPerformance)); + } + return 0; +} + +DOMHighResTimeStamp PerformanceTimingData::DomainLookupStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + // Bug 1637985 - DomainLookup information may be useful for fingerprinting. + if (aPerformance->ShouldResistFingerprinting()) { + return FetchStartHighRes(aPerformance); + } + return TimeStampToReducedDOMHighResOrFetchStart(aPerformance, + mDomainLookupStart); +} + +DOMTimeMilliSec PerformanceTiming::DomainLookupStart() { + return static_cast<int64_t>( + mTimingData->DomainLookupStartHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::DomainLookupEndHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + // Bug 1637985 - DomainLookup information may be useful for fingerprinting. + if (aPerformance->ShouldResistFingerprinting()) { + return FetchStartHighRes(aPerformance); + } + // Bug 1155008 - nsHttpTransaction is racy. Return DomainLookupStart when null + if (mDomainLookupEnd.IsNull()) { + return DomainLookupStartHighRes(aPerformance); + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mDomainLookupEnd); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::DomainLookupEnd() { + return static_cast<int64_t>( + mTimingData->DomainLookupEndHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::ConnectStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + if (mConnectStart.IsNull()) { + return DomainLookupEndHighRes(aPerformance); + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mConnectStart); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::ConnectStart() { + return static_cast<int64_t>(mTimingData->ConnectStartHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::SecureConnectionStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + if (!mSecureConnection) { + return 0; // We use 0 here, because mZeroTime is sometimes set to the + // navigation start time. + } + if (mSecureConnectionStart.IsNull()) { + return ConnectStartHighRes(aPerformance); + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mSecureConnectionStart); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::SecureConnectionStart() { + return static_cast<int64_t>( + mTimingData->SecureConnectionStartHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::ConnectEndHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + // Bug 1155008 - nsHttpTransaction is racy. Return ConnectStart when null + if (mConnectEnd.IsNull()) { + return ConnectStartHighRes(aPerformance); + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mConnectEnd); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::ConnectEnd() { + return static_cast<int64_t>(mTimingData->ConnectEndHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::RequestStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + + if (mRequestStart.IsNull()) { + mRequestStart = mWorkerRequestStart; + } + + return TimeStampToReducedDOMHighResOrFetchStart(aPerformance, mRequestStart); +} + +DOMTimeMilliSec PerformanceTiming::RequestStart() { + return static_cast<int64_t>(mTimingData->RequestStartHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::ResponseStartHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + if (mResponseStart.IsNull() || + (!mCacheReadStart.IsNull() && mCacheReadStart < mResponseStart)) { + mResponseStart = mCacheReadStart; + } + + if (mResponseStart.IsNull() || + (!mRequestStart.IsNull() && mResponseStart < mRequestStart)) { + mResponseStart = mRequestStart; + } + return TimeStampToReducedDOMHighResOrFetchStart(aPerformance, mResponseStart); +} + +DOMTimeMilliSec PerformanceTiming::ResponseStart() { + return static_cast<int64_t>(mTimingData->ResponseStartHighRes(mPerformance)); +} + +DOMHighResTimeStamp PerformanceTimingData::ResponseEndHighRes( + Performance* aPerformance) { + MOZ_ASSERT(aPerformance); + + if (!StaticPrefs::dom_enable_performance() || !IsInitialized()) { + return mZeroTime; + } + if (mResponseEnd.IsNull() || + (!mCacheReadEnd.IsNull() && mCacheReadEnd < mResponseEnd)) { + mResponseEnd = mCacheReadEnd; + } + if (mResponseEnd.IsNull()) { + mResponseEnd = mWorkerResponseEnd; + } + // Bug 1155008 - nsHttpTransaction is racy. Return ResponseStart when null + if (mResponseEnd.IsNull()) { + return ResponseStartHighRes(aPerformance); + } + DOMHighResTimeStamp rawValue = + TimeStampToDOMHighRes(aPerformance, mResponseEnd); + return nsRFPService::ReduceTimePrecisionAsMSecs( + rawValue, aPerformance->GetRandomTimelineSeed(), + aPerformance->GetRTPCallerType()); +} + +DOMTimeMilliSec PerformanceTiming::ResponseEnd() { + return static_cast<int64_t>(mTimingData->ResponseEndHighRes(mPerformance)); +} + +JSObject* PerformanceTiming::WrapObject(JSContext* cx, + JS::Handle<JSObject*> aGivenProto) { + return PerformanceTiming_Binding::Wrap(cx, this, aGivenProto); +} + +bool PerformanceTiming::IsTopLevelContentDocument() const { + nsCOMPtr<Document> document = mPerformance->GetDocumentIfCurrent(); + if (!document) { + return false; + } + + if (BrowsingContext* bc = document->GetBrowsingContext()) { + return bc->IsTopContent(); + } + return false; +} + +nsTArray<nsCOMPtr<nsIServerTiming>> PerformanceTimingData::GetServerTiming() { + if (!StaticPrefs::dom_enable_performance() || !IsInitialized() || + !TimingAllowed()) { + return nsTArray<nsCOMPtr<nsIServerTiming>>(); + } + + return mServerTiming.Clone(); +} + +} // namespace mozilla::dom |