diff options
Diffstat (limited to 'uriloader/preload/PreloaderBase.cpp')
| -rw-r--r-- | uriloader/preload/PreloaderBase.cpp | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/uriloader/preload/PreloaderBase.cpp b/uriloader/preload/PreloaderBase.cpp new file mode 100644 index 0000000000..2c3d4fb60b --- /dev/null +++ b/uriloader/preload/PreloaderBase.cpp @@ -0,0 +1,391 @@ +/* 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 "PreloaderBase.h" + +#include "mozilla/dom/Document.h" +#include "mozilla/Telemetry.h" +#include "nsContentUtils.h" +#include "nsIAsyncVerifyRedirectCallback.h" +#include "nsIHttpChannel.h" +#include "nsILoadGroup.h" +#include "nsIInterfaceRequestorUtils.h" +#include "nsIRedirectResultListener.h" +#include "nsNetUtil.h" + +// Change this if we want to cancel and remove the associated preload on removal +// of all <link rel=preload> tags from the tree. +constexpr static bool kCancelAndRemovePreloadOnZeroReferences = false; + +namespace mozilla { + +PreloaderBase::UsageTimer::UsageTimer(PreloaderBase* aPreload, + dom::Document* aDocument) + : mDocument(aDocument), mPreload(aPreload) {} + +class PreloaderBase::RedirectSink final : public nsIInterfaceRequestor, + public nsIChannelEventSink, + public nsIRedirectResultListener { + RedirectSink() = delete; + virtual ~RedirectSink(); + + public: + NS_DECL_THREADSAFE_ISUPPORTS + NS_DECL_NSIINTERFACEREQUESTOR + NS_DECL_NSICHANNELEVENTSINK + NS_DECL_NSIREDIRECTRESULTLISTENER + + RedirectSink(PreloaderBase* aPreloader, nsIInterfaceRequestor* aCallbacks); + + private: + MainThreadWeakPtr<PreloaderBase> mPreloader; + nsCOMPtr<nsIInterfaceRequestor> mCallbacks; + nsCOMPtr<nsIChannel> mRedirectChannel; +}; + +PreloaderBase::RedirectSink::RedirectSink(PreloaderBase* aPreloader, + nsIInterfaceRequestor* aCallbacks) + : mPreloader(aPreloader), mCallbacks(aCallbacks) {} + +PreloaderBase::RedirectSink::~RedirectSink() = default; + +NS_IMPL_ISUPPORTS(PreloaderBase::RedirectSink, nsIInterfaceRequestor, + nsIChannelEventSink, nsIRedirectResultListener) + +NS_IMETHODIMP PreloaderBase::RedirectSink::AsyncOnChannelRedirect( + nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags, + nsIAsyncVerifyRedirectCallback* aCallback) { + MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread()); + + mRedirectChannel = aNewChannel; + + // Deliberately adding this before confirmation. + nsCOMPtr<nsIURI> uri; + aNewChannel->GetOriginalURI(getter_AddRefs(uri)); + if (mPreloader) { + mPreloader->mRedirectRecords.AppendElement( + RedirectRecord(aFlags, uri.forget())); + } + + if (mCallbacks) { + nsCOMPtr<nsIChannelEventSink> sink(do_GetInterface(mCallbacks)); + if (sink) { + return sink->AsyncOnChannelRedirect(aOldChannel, aNewChannel, aFlags, + aCallback); + } + } + + aCallback->OnRedirectVerifyCallback(NS_OK); + return NS_OK; +} + +NS_IMETHODIMP PreloaderBase::RedirectSink::OnRedirectResult(nsresult status) { + if (NS_SUCCEEDED(status) && mRedirectChannel) { + mPreloader->mChannel = std::move(mRedirectChannel); + } else { + mRedirectChannel = nullptr; + } + + if (mCallbacks) { + nsCOMPtr<nsIRedirectResultListener> sink(do_GetInterface(mCallbacks)); + if (sink) { + return sink->OnRedirectResult(status); + } + } + + return NS_OK; +} + +NS_IMETHODIMP PreloaderBase::RedirectSink::GetInterface(const nsIID& aIID, + void** aResult) { + NS_ENSURE_ARG_POINTER(aResult); + + if (aIID.Equals(NS_GET_IID(nsIChannelEventSink)) || + aIID.Equals(NS_GET_IID(nsIRedirectResultListener))) { + return QueryInterface(aIID, aResult); + } + + if (mCallbacks) { + return mCallbacks->GetInterface(aIID, aResult); + } + + *aResult = nullptr; + return NS_ERROR_NO_INTERFACE; +} + +PreloaderBase::~PreloaderBase() { MOZ_ASSERT(NS_IsMainThread()); } + +// static +void PreloaderBase::AddLoadBackgroundFlag(nsIChannel* aChannel) { + nsLoadFlags loadFlags; + aChannel->GetLoadFlags(&loadFlags); + aChannel->SetLoadFlags(loadFlags | nsIRequest::LOAD_BACKGROUND); +} + +void PreloaderBase::NotifyOpen(const PreloadHashKey& aKey, + dom::Document* aDocument, bool aIsPreload, + bool aIsModule) { + if (aDocument) { + DebugOnly<bool> alreadyRegistered = + aDocument->Preloads().RegisterPreload(aKey, this); + // This means there is already a preload registered under this key in this + // document. We only allow replacement when this is a regular load. + // Otherwise, this should never happen and is a suspected misuse of the API. + MOZ_ASSERT_IF(alreadyRegistered, !aIsPreload); + } + + mKey = aKey; + mIsUsed = !aIsPreload; + + // Start usage timer for rel="preload", but not for rel="modulepreload" + // because modules may be loaded for functionality the user does not + // immediately interact with after page load (e.g. a docs search box) + if (!aIsModule && !mIsUsed && !mUsageTimer) { + auto callback = MakeRefPtr<UsageTimer>(this, aDocument); + NS_NewTimerWithCallback(getter_AddRefs(mUsageTimer), callback, 10000, + nsITimer::TYPE_ONE_SHOT); + } + + ReportUsageTelemetry(); +} + +void PreloaderBase::NotifyOpen(const PreloadHashKey& aKey, nsIChannel* aChannel, + dom::Document* aDocument, bool aIsPreload, + bool aIsModule) { + NotifyOpen(aKey, aDocument, aIsPreload, aIsModule); + mChannel = aChannel; + + nsCOMPtr<nsIInterfaceRequestor> callbacks; + mChannel->GetNotificationCallbacks(getter_AddRefs(callbacks)); + RefPtr<RedirectSink> sink(new RedirectSink(this, callbacks)); + mChannel->SetNotificationCallbacks(sink); +} + +void PreloaderBase::NotifyUsage(dom::Document* aDocument, + LoadBackground aLoadBackground) { + if (!mIsUsed && mChannel && aLoadBackground == LoadBackground::Drop) { + nsLoadFlags loadFlags; + mChannel->GetLoadFlags(&loadFlags); + + // Preloads are initially set the LOAD_BACKGROUND flag. When becoming + // regular loads by hitting its consuming tag, we need to drop that flag, + // which also means to re-add the request from/to it's loadgroup to reflect + // that flag change. + if (loadFlags & nsIRequest::LOAD_BACKGROUND) { + nsCOMPtr<nsILoadGroup> loadGroup; + mChannel->GetLoadGroup(getter_AddRefs(loadGroup)); + + if (loadGroup) { + nsresult status; + mChannel->GetStatus(&status); + + nsresult rv = loadGroup->RemoveRequest(mChannel, nullptr, status); + mChannel->SetLoadFlags(loadFlags & ~nsIRequest::LOAD_BACKGROUND); + if (NS_SUCCEEDED(rv)) { + loadGroup->AddRequest(mChannel, nullptr); + } + } + } + } + + mIsUsed = true; + ReportUsageTelemetry(); + CancelUsageTimer(); + if (mIsEarlyHintsPreload) { + aDocument->Preloads().SetEarlyHintUsed(); + } +} + +void PreloaderBase::RemoveSelf(dom::Document* aDocument) { + if (aDocument) { + aDocument->Preloads().DeregisterPreload(mKey); + } +} + +void PreloaderBase::NotifyRestart(dom::Document* aDocument, + PreloaderBase* aNewPreloader) { + RemoveSelf(aDocument); + mKey = PreloadHashKey(); + + CancelUsageTimer(); + + if (aNewPreloader) { + aNewPreloader->mNodes = std::move(mNodes); + } +} + +void PreloaderBase::NotifyStart(nsIRequest* aRequest) { + // If there is no channel assigned on this preloader, we are not between + // channel switching, so we can freely update the mShouldFireLoadEvent using + // the given channel. + if (mChannel && !SameCOMIdentity(aRequest, mChannel)) { + return; + } + + nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest); + if (!httpChannel) { + return; + } + + // if the load is cross origin without CORS, or the CORS access is rejected, + // always fire load event to avoid leaking site information. + nsresult rv; + nsCOMPtr<nsILoadInfo> loadInfo = httpChannel->LoadInfo(); + mShouldFireLoadEvent = + loadInfo->GetTainting() == LoadTainting::Opaque || + (loadInfo->GetTainting() == LoadTainting::CORS && + (NS_FAILED(httpChannel->GetStatus(&rv)) || NS_FAILED(rv))); +} + +void PreloaderBase::NotifyStop(nsIRequest* aRequest, nsresult aStatus) { + // Filter out notifications that may be arriving from the old channel before + // restarting this request. + if (!SameCOMIdentity(aRequest, mChannel)) { + return; + } + + NotifyStop(aStatus); +} + +void PreloaderBase::NotifyStop(nsresult aStatus) { + mOnStopStatus.emplace(aStatus); + + nsTArray<nsWeakPtr> nodes = std::move(mNodes); + + for (nsWeakPtr& weak : nodes) { + nsCOMPtr<nsINode> node = do_QueryReferent(weak); + if (node) { + NotifyNodeEvent(node); + } + } + + mChannel = nullptr; +} + +void PreloaderBase::AddLinkPreloadNode(nsINode* aNode) { + if (mOnStopStatus) { + return NotifyNodeEvent(aNode); + } + + mNodes.AppendElement(do_GetWeakReference(aNode)); +} + +void PreloaderBase::RemoveLinkPreloadNode(nsINode* aNode) { + // Note that do_GetWeakReference returns the internal weak proxy, which is + // always the same, so we can use it to search the array using default + // comparator. + nsWeakPtr node = do_GetWeakReference(aNode); + mNodes.RemoveElement(node); + + if (kCancelAndRemovePreloadOnZeroReferences && mNodes.Length() == 0 && + !mIsUsed) { + // Keep a reference, because the following call may release us. The caller + // may use a WeakPtr to access this. + RefPtr<PreloaderBase> self(this); + RemoveSelf(aNode->OwnerDoc()); + + if (mChannel) { + mChannel->CancelWithReason(NS_BINDING_ABORTED, + "PreloaderBase::RemoveLinkPreloadNode"_ns); + } + } +} + +void PreloaderBase::NotifyNodeEvent(nsINode* aNode) { + PreloadService::NotifyNodeEvent( + aNode, mShouldFireLoadEvent || NS_SUCCEEDED(*mOnStopStatus)); +} + +void PreloaderBase::CancelUsageTimer() { + if (mUsageTimer) { + mUsageTimer->Cancel(); + mUsageTimer = nullptr; + } +} + +void PreloaderBase::ReportUsageTelemetry() { + if (mUsageTelementryReported) { + return; + } + mUsageTelementryReported = true; + + if (mKey.As() == PreloadHashKey::ResourceType::NONE) { + return; + } + + // The labels are structured as type1-used, type1-unused, type2-used, ... + // The first "as" resource type is NONE with value 0. + auto index = (static_cast<uint32_t>(mKey.As()) - 1) * 2; + if (!mIsUsed) { + ++index; + } + + auto label = static_cast<Telemetry::LABELS_REL_PRELOAD_MISS_RATIO>(index); + Telemetry::AccumulateCategorical(label); +} + +nsresult PreloaderBase::AsyncConsume(nsIStreamListener* aListener) { + // We want to return an error so that consumers can't ever use a preload to + // consume data unless it's properly implemented. + return NS_ERROR_NOT_IMPLEMENTED; +} + +// PreloaderBase::RedirectRecord + +nsCString PreloaderBase::RedirectRecord::Spec() const { + nsCOMPtr<nsIURI> noFragment; + NS_GetURIWithoutRef(mURI, getter_AddRefs(noFragment)); + MOZ_ASSERT(noFragment); + return noFragment->GetSpecOrDefault(); +} + +nsCString PreloaderBase::RedirectRecord::Fragment() const { + nsCString fragment; + mURI->GetRef(fragment); + return fragment; +} + +// PreloaderBase::UsageTimer + +NS_IMPL_ISUPPORTS(PreloaderBase::UsageTimer, nsITimerCallback, nsINamed) + +NS_IMETHODIMP PreloaderBase::UsageTimer::Notify(nsITimer* aTimer) { + if (!mPreload || !mDocument) { + return NS_OK; + } + + MOZ_ASSERT(aTimer == mPreload->mUsageTimer); + mPreload->mUsageTimer = nullptr; + + if (mPreload->IsUsed()) { + // Left in the hashtable, but marked as used. This is a valid case, and we + // don't want to emit a warning for this preload then. + return NS_OK; + } + + mPreload->ReportUsageTelemetry(); + + // PreloadHashKey overrides GetKey, we need to use the nsURIHashKey one to get + // the URI. + nsIURI* uri = static_cast<nsURIHashKey*>(&mPreload->mKey)->GetKey(); + if (!uri) { + return NS_OK; + } + + nsString spec; + NS_GetSanitizedURIStringFromURI(uri, spec); + nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "DOM"_ns, + mDocument, nsContentUtils::eDOM_PROPERTIES, + "UnusedLinkPreloadPending", + nsTArray<nsString>({std::move(spec)})); + return NS_OK; +} + +NS_IMETHODIMP +PreloaderBase::UsageTimer::GetName(nsACString& aName) { + aName.AssignLiteral("PreloaderBase::UsageTimer"); + return NS_OK; +} + +} // namespace mozilla |