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gecko-dev/uriloader/prefetch/nsPrefetchService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsPrefetchService.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Attributes.h"
#include "mozilla/CORSMode.h"
#include "mozilla/Components.h"
#include "mozilla/dom/ClientInfo.h"
#include "mozilla/dom/HTMLLinkElement.h"
#include "mozilla/dom/ServiceWorkerDescriptor.h"
#include "mozilla/Preferences.h"
#include "ReferrerInfo.h"
#include "nsIObserverService.h"
#include "nsIWebProgress.h"
#include "nsICacheInfoChannel.h"
#include "nsIHttpChannel.h"
#include "nsIURL.h"
#include "nsISupportsPriority.h"
#include "nsNetUtil.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsStreamUtils.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsINode.h"
#include "mozilla/dom/Document.h"
#include "nsContentUtils.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "nsICachingChannel.h"
#include "nsHttp.h"
using namespace mozilla;
using namespace mozilla::dom;
//
// To enable logging (see mozilla/Logging.h for full details):
//
// set MOZ_LOG=nsPrefetch:5
// set MOZ_LOG_FILE=prefetch.log
//
// this enables LogLevel::Debug level information and places all output in
// the file prefetch.log
//
static LazyLogModule gPrefetchLog("nsPrefetch");
#undef LOG
#define LOG(args) MOZ_LOG(gPrefetchLog, mozilla::LogLevel::Debug, args)
#undef LOG_ENABLED
#define LOG_ENABLED() MOZ_LOG_TEST(gPrefetchLog, mozilla::LogLevel::Debug)
#define PREFETCH_PREF "network.prefetch-next"
#define PARALLELISM_PREF "network.prefetch-next.parallelism"
#define AGGRESSIVE_PREF "network.prefetch-next.aggressive"
//-----------------------------------------------------------------------------
// nsPrefetchNode <public>
//-----------------------------------------------------------------------------
nsPrefetchNode::nsPrefetchNode(nsPrefetchService* aService, nsIURI* aURI,
nsIReferrerInfo* aReferrerInfo, nsINode* aSource,
nsContentPolicyType aPolicyType, bool aPreload)
: mURI(aURI),
mReferrerInfo(aReferrerInfo),
mPolicyType(aPolicyType),
mPreload(aPreload),
mService(aService),
mChannel(nullptr),
mBytesRead(0),
mShouldFireLoadEvent(false) {
nsWeakPtr source = do_GetWeakReference(aSource);
mSources.AppendElement(source);
}
nsresult nsPrefetchNode::OpenChannel() {
if (mSources.IsEmpty()) {
// Don't attempt to prefetch if we don't have a source node
// (which should never happen).
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsINode> source;
while (!mSources.IsEmpty() &&
!(source = do_QueryReferent(mSources.ElementAt(0)))) {
// If source is null remove it.
// (which should never happen).
mSources.RemoveElementAt(0);
}
if (!source) {
// Don't attempt to prefetch if we don't have a source node
// (which should never happen).
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsILoadGroup> loadGroup = source->OwnerDoc()->GetDocumentLoadGroup();
CORSMode corsMode = CORS_NONE;
if (auto* link = dom::HTMLLinkElement::FromNode(source)) {
corsMode = link->GetCORSMode();
}
uint32_t securityFlags;
if (corsMode == CORS_NONE) {
securityFlags = nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT;
} else {
securityFlags = nsILoadInfo::SEC_REQUIRE_CORS_INHERITS_SEC_CONTEXT;
if (corsMode == CORS_USE_CREDENTIALS) {
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
}
}
nsresult rv = NS_NewChannelInternal(
getter_AddRefs(mChannel), mURI, source, source->NodePrincipal(),
nullptr, // aTriggeringPrincipal
Maybe<ClientInfo>(), Maybe<ServiceWorkerDescriptor>(), securityFlags,
mPolicyType, source->OwnerDoc()->CookieJarSettings(),
nullptr, // aPerformanceStorage
loadGroup, // aLoadGroup
this, // aCallbacks
nsIRequest::LOAD_BACKGROUND | nsICachingChannel::LOAD_ONLY_IF_MODIFIED);
NS_ENSURE_SUCCESS(rv, rv);
// configure HTTP specific stuff
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel);
if (httpChannel) {
DebugOnly<nsresult> success = httpChannel->SetReferrerInfo(mReferrerInfo);
MOZ_ASSERT(NS_SUCCEEDED(success));
// https://fetch.spec.whatwg.org/#http-sec-purpose
success =
httpChannel->SetRequestHeader("Sec-Purpose"_ns, "prefetch"_ns, false);
MOZ_ASSERT(NS_SUCCEEDED(success));
}
// Reduce the priority of prefetch network requests.
nsCOMPtr<nsISupportsPriority> priorityChannel = do_QueryInterface(mChannel);
if (priorityChannel) {
priorityChannel->AdjustPriority(nsISupportsPriority::PRIORITY_LOWEST);
}
rv = mChannel->AsyncOpen(this);
if (NS_WARN_IF(NS_FAILED(rv))) {
// Drop the ref to the channel, because we don't want to end up with
// cycles through it.
mChannel = nullptr;
}
return rv;
}
nsresult nsPrefetchNode::CancelChannel(nsresult error) {
mChannel->Cancel(error);
mChannel = nullptr;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchNode, nsIRequestObserver, nsIStreamListener,
nsIInterfaceRequestor, nsIChannelEventSink,
nsIRedirectResultListener)
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIStreamListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::OnStartRequest(nsIRequest* aRequest) {
nsresult rv;
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest, &rv);
if (NS_FAILED(rv)) return rv;
// if the load is cross origin without CORS, or the CORS access is rejected,
// always fire load event to avoid leaking site information.
nsCOMPtr<nsILoadInfo> loadInfo = httpChannel->LoadInfo();
mShouldFireLoadEvent =
loadInfo->GetTainting() == LoadTainting::Opaque ||
(loadInfo->GetTainting() == LoadTainting::CORS &&
(NS_FAILED(httpChannel->GetStatus(&rv)) || NS_FAILED(rv)));
// no need to prefetch http error page
bool requestSucceeded;
if (NS_FAILED(httpChannel->GetRequestSucceeded(&requestSucceeded)) ||
!requestSucceeded) {
return NS_BINDING_ABORTED;
}
nsCOMPtr<nsICacheInfoChannel> cacheInfoChannel =
do_QueryInterface(aRequest, &rv);
if (NS_FAILED(rv)) return rv;
// no need to prefetch a document that is already in the cache
bool fromCache;
if (NS_SUCCEEDED(cacheInfoChannel->IsFromCache(&fromCache)) && fromCache) {
LOG(("document is already in the cache; canceling prefetch\n"));
// although it's canceled we still want to fire load event
mShouldFireLoadEvent = true;
return NS_BINDING_ABORTED;
}
//
// no need to prefetch a document that must be requested fresh each
// and every time.
//
uint32_t expTime;
if (NS_SUCCEEDED(cacheInfoChannel->GetCacheTokenExpirationTime(&expTime))) {
if (mozilla::net::NowInSeconds() >= expTime) {
LOG(
("document cannot be reused from cache; "
"canceling prefetch\n"));
return NS_BINDING_ABORTED;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchNode::OnDataAvailable(nsIRequest* aRequest, nsIInputStream* aStream,
uint64_t aOffset, uint32_t aCount) {
uint32_t bytesRead = 0;
aStream->ReadSegments(NS_DiscardSegment, nullptr, aCount, &bytesRead);
mBytesRead += bytesRead;
LOG(("prefetched %u bytes [offset=%" PRIu64 "]\n", bytesRead, aOffset));
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchNode::OnStopRequest(nsIRequest* aRequest, nsresult aStatus) {
LOG(("done prefetching [status=%" PRIx32 "]\n",
static_cast<uint32_t>(aStatus)));
if (mBytesRead == 0 && aStatus == NS_OK && mChannel) {
// we didn't need to read (because LOAD_ONLY_IF_MODIFIED was
// specified), but the object should report loadedSize as if it
// did.
mChannel->GetContentLength(&mBytesRead);
}
mService->NotifyLoadCompleted(this);
mService->DispatchEvent(this, mShouldFireLoadEvent || NS_SUCCEEDED(aStatus));
mService->RemoveNodeAndMaybeStartNextPrefetchURI(this);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIInterfaceRequestor
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::GetInterface(const nsIID& aIID, void** aResult) {
if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
NS_ADDREF_THIS();
*aResult = static_cast<nsIChannelEventSink*>(this);
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsIRedirectResultListener))) {
NS_ADDREF_THIS();
*aResult = static_cast<nsIRedirectResultListener*>(this);
return NS_OK;
}
return NS_ERROR_NO_INTERFACE;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIChannelEventSink
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::AsyncOnChannelRedirect(
nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags,
nsIAsyncVerifyRedirectCallback* callback) {
nsCOMPtr<nsIURI> newURI;
nsresult rv = aNewChannel->GetURI(getter_AddRefs(newURI));
if (NS_FAILED(rv)) return rv;
if (!newURI->SchemeIs("http") && !newURI->SchemeIs("https")) {
LOG(("rejected: URL is not of type http/https\n"));
return NS_ERROR_ABORT;
}
// HTTP request headers are not automatically forwarded to the new channel.
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aNewChannel);
NS_ENSURE_STATE(httpChannel);
// https://fetch.spec.whatwg.org/#http-sec-purpose
rv = httpChannel->SetRequestHeader("Sec-Purpose"_ns, "prefetch"_ns, false);
MOZ_ASSERT(NS_SUCCEEDED(rv));
// Assign to mChannel after we get notification about success of the
// redirect in OnRedirectResult.
mRedirectChannel = aNewChannel;
callback->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchNode::nsIRedirectResultListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchNode::OnRedirectResult(nsresult status) {
if (NS_SUCCEEDED(status) && mRedirectChannel) mChannel = mRedirectChannel;
mRedirectChannel = nullptr;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService <public>
//-----------------------------------------------------------------------------
nsPrefetchService::nsPrefetchService()
: mMaxParallelism(6),
mStopCount(0),
mHaveProcessed(false),
mPrefetchDisabled(true),
mAggressive(false) {}
nsPrefetchService::~nsPrefetchService() {
Preferences::RemoveObserver(this, PREFETCH_PREF);
Preferences::RemoveObserver(this, PARALLELISM_PREF);
Preferences::RemoveObserver(this, AGGRESSIVE_PREF);
// cannot reach destructor if prefetch in progress (listener owns reference
// to this service)
EmptyPrefetchQueue();
}
nsresult nsPrefetchService::Init() {
nsresult rv;
// read prefs and hook up pref observer
mPrefetchDisabled = !Preferences::GetBool(PREFETCH_PREF, !mPrefetchDisabled);
Preferences::AddWeakObserver(this, PREFETCH_PREF);
mMaxParallelism = Preferences::GetInt(PARALLELISM_PREF, mMaxParallelism);
if (mMaxParallelism < 1) {
mMaxParallelism = 1;
}
Preferences::AddWeakObserver(this, PARALLELISM_PREF);
mAggressive = Preferences::GetBool(AGGRESSIVE_PREF, false);
Preferences::AddWeakObserver(this, AGGRESSIVE_PREF);
// Observe xpcom-shutdown event
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService) return NS_ERROR_FAILURE;
rv = observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
NS_ENSURE_SUCCESS(rv, rv);
if (!mPrefetchDisabled) {
AddProgressListener();
}
return NS_OK;
}
void nsPrefetchService::RemoveNodeAndMaybeStartNextPrefetchURI(
nsPrefetchNode* aFinished) {
if (aFinished) {
mCurrentNodes.RemoveElement(aFinished);
}
if ((!mStopCount && mHaveProcessed) || mAggressive) {
ProcessNextPrefetchURI();
}
}
void nsPrefetchService::ProcessNextPrefetchURI() {
if (mCurrentNodes.Length() >= static_cast<uint32_t>(mMaxParallelism)) {
// We already have enough prefetches going on, so hold off
// for now.
return;
}
nsresult rv;
do {
if (mPrefetchQueue.empty()) {
break;
}
RefPtr<nsPrefetchNode> node = std::move(mPrefetchQueue.front());
mPrefetchQueue.pop_front();
if (LOG_ENABLED()) {
LOG(("ProcessNextPrefetchURI [%s]\n",
node->mURI->GetSpecOrDefault().get()));
}
//
// if opening the channel fails (e.g. security check returns an error),
// send an error event and then just skip to the next uri
//
rv = node->OpenChannel();
if (NS_SUCCEEDED(rv)) {
mCurrentNodes.AppendElement(node);
} else {
DispatchEvent(node, false);
}
} while (NS_FAILED(rv));
}
void nsPrefetchService::NotifyLoadRequested(nsPrefetchNode* node) {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService) return;
observerService->NotifyObservers(
static_cast<nsIStreamListener*>(node),
(node->mPreload) ? "preload-load-requested" : "prefetch-load-requested",
nullptr);
}
void nsPrefetchService::NotifyLoadCompleted(nsPrefetchNode* node) {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService) return;
observerService->NotifyObservers(
static_cast<nsIStreamListener*>(node),
(node->mPreload) ? "preload-load-completed" : "prefetch-load-completed",
nullptr);
}
void nsPrefetchService::DispatchEvent(nsPrefetchNode* node, bool aSuccess) {
for (uint32_t i = 0; i < node->mSources.Length(); i++) {
nsCOMPtr<nsINode> domNode = do_QueryReferent(node->mSources.ElementAt(i));
if (domNode && domNode->IsInComposedDoc()) {
// We don't dispatch synchronously since |node| might be in a DocGroup
// that we're not allowed to touch. (Our network request happens in the
// DocGroup of one of the mSources nodes--not necessarily this one).
RefPtr<AsyncEventDispatcher> dispatcher = new AsyncEventDispatcher(
domNode, aSuccess ? u"load"_ns : u"error"_ns, CanBubble::eNo);
dispatcher->RequireNodeInDocument();
dispatcher->PostDOMEvent();
}
}
}
//-----------------------------------------------------------------------------
// nsPrefetchService <private>
//-----------------------------------------------------------------------------
void nsPrefetchService::AddProgressListener() {
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress = components::DocLoader::Service();
if (progress)
progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
}
void nsPrefetchService::RemoveProgressListener() {
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress = components::DocLoader::Service();
if (progress) progress->RemoveProgressListener(this);
}
nsresult nsPrefetchService::EnqueueURI(nsIURI* aURI,
nsIReferrerInfo* aReferrerInfo,
nsINode* aSource,
nsPrefetchNode** aNode) {
RefPtr<nsPrefetchNode> node = new nsPrefetchNode(
this, aURI, aReferrerInfo, aSource, nsIContentPolicy::TYPE_OTHER, false);
mPrefetchQueue.push_back(node);
node.forget(aNode);
return NS_OK;
}
void nsPrefetchService::EmptyPrefetchQueue() {
while (!mPrefetchQueue.empty()) {
mPrefetchQueue.pop_back();
}
}
void nsPrefetchService::StartPrefetching() {
//
// at initialization time we might miss the first DOCUMENT START
// notification, so we have to be careful to avoid letting our
// stop count go negative.
//
if (mStopCount > 0) mStopCount--;
LOG(("StartPrefetching [stopcount=%d]\n", mStopCount));
// only start prefetching after we've received enough DOCUMENT
// STOP notifications. we do this inorder to defer prefetching
// until after all sub-frames have finished loading.
if (!mStopCount) {
mHaveProcessed = true;
while (!mPrefetchQueue.empty() &&
mCurrentNodes.Length() < static_cast<uint32_t>(mMaxParallelism)) {
ProcessNextPrefetchURI();
}
}
}
void nsPrefetchService::StopPrefetching() {
mStopCount++;
LOG(("StopPrefetching [stopcount=%d]\n", mStopCount));
// When we start a load, we need to stop all prefetches that has been
// added by the old load, therefore call StopAll only at the moment we
// switch to a new page load (i.e. mStopCount == 1).
// TODO: do not stop prefetches that are relevant for the new load.
if (mStopCount == 1) {
StopAll();
}
}
void nsPrefetchService::StopCurrentPrefetchsPreloads(bool aPreload) {
for (int32_t i = mCurrentNodes.Length() - 1; i >= 0; --i) {
if (mCurrentNodes[i]->mPreload == aPreload) {
mCurrentNodes[i]->CancelChannel(NS_BINDING_ABORTED);
mCurrentNodes.RemoveElementAt(i);
}
}
if (!aPreload) {
EmptyPrefetchQueue();
}
}
void nsPrefetchService::StopAll() {
for (uint32_t i = 0; i < mCurrentNodes.Length(); ++i) {
mCurrentNodes[i]->CancelChannel(NS_BINDING_ABORTED);
}
mCurrentNodes.Clear();
EmptyPrefetchQueue();
}
nsresult nsPrefetchService::CheckURIScheme(nsIURI* aURI,
nsIReferrerInfo* aReferrerInfo) {
//
// XXX we should really be asking the protocol handler if it supports
// caching, so we can determine if there is any value to prefetching.
// for now, we'll only prefetch http and https links since we know that's
// the most common case.
//
if (!aURI->SchemeIs("http") && !aURI->SchemeIs("https")) {
LOG(("rejected: URL is not of type http/https\n"));
return NS_ERROR_ABORT;
}
//
// the referrer URI must be http:
//
nsCOMPtr<nsIURI> referrer = aReferrerInfo->GetOriginalReferrer();
if (!referrer) {
return NS_ERROR_ABORT;
}
if (!referrer->SchemeIs("http") && !referrer->SchemeIs("https")) {
LOG(("rejected: referrer URL is neither http nor https\n"));
return NS_ERROR_ABORT;
}
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchService, nsIPrefetchService, nsIWebProgressListener,
nsIObserver, nsISupportsWeakReference)
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIPrefetchService
//-----------------------------------------------------------------------------
nsresult nsPrefetchService::Preload(nsIURI* aURI,
nsIReferrerInfo* aReferrerInfo,
nsINode* aSource,
nsContentPolicyType aPolicyType) {
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_ARG_POINTER(aReferrerInfo);
if (LOG_ENABLED()) {
LOG(("PreloadURI [%s]\n", aURI->GetSpecOrDefault().get()));
}
LOG(("rejected: preload service is deprecated\n"));
return NS_ERROR_ABORT;
}
nsresult nsPrefetchService::Prefetch(nsIURI* aURI,
nsIReferrerInfo* aReferrerInfo,
nsINode* aSource, bool aExplicit) {
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_ARG_POINTER(aReferrerInfo);
if (LOG_ENABLED()) {
LOG(("PrefetchURI [%s]\n", aURI->GetSpecOrDefault().get()));
}
if (mPrefetchDisabled) {
LOG(("rejected: prefetch service is disabled\n"));
return NS_ERROR_ABORT;
}
nsresult rv = CheckURIScheme(aURI, aReferrerInfo);
if (NS_FAILED(rv)) {
return rv;
}
// XXX we might want to either leverage nsIProtocolHandler::protocolFlags
// or possibly nsIRequest::loadFlags to determine if this URI should be
// prefetched.
//
// skip URLs that contain query strings, except URLs for which prefetching
// has been explicitly requested.
if (!aExplicit) {
nsCOMPtr<nsIURL> url(do_QueryInterface(aURI, &rv));
if (NS_FAILED(rv)) return rv;
nsAutoCString query;
rv = url->GetQuery(query);
if (NS_FAILED(rv) || !query.IsEmpty()) {
LOG(("rejected: URL has a query string\n"));
return NS_ERROR_ABORT;
}
}
//
// Check whether it is being prefetched.
//
for (uint32_t i = 0; i < mCurrentNodes.Length(); ++i) {
bool equals;
if (NS_SUCCEEDED(mCurrentNodes[i]->mURI->Equals(aURI, &equals)) && equals) {
nsWeakPtr source = do_GetWeakReference(aSource);
if (mCurrentNodes[i]->mSources.IndexOf(source) ==
mCurrentNodes[i]->mSources.NoIndex) {
LOG(
("URL is already being prefetched, add a new reference "
"document\n"));
mCurrentNodes[i]->mSources.AppendElement(source);
return NS_OK;
} else {
LOG(("URL is already being prefetched by this document"));
return NS_ERROR_ABORT;
}
}
}
//
// Check whether it is on the prefetch queue.
//
for (std::deque<RefPtr<nsPrefetchNode>>::iterator nodeIt =
mPrefetchQueue.begin();
nodeIt != mPrefetchQueue.end(); nodeIt++) {
bool equals;
RefPtr<nsPrefetchNode> node = nodeIt->get();
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
nsWeakPtr source = do_GetWeakReference(aSource);
if (node->mSources.IndexOf(source) == node->mSources.NoIndex) {
LOG(
("URL is already being prefetched, add a new reference "
"document\n"));
node->mSources.AppendElement(do_GetWeakReference(aSource));
return NS_OK;
} else {
LOG(("URL is already being prefetched by this document"));
return NS_ERROR_ABORT;
}
}
}
RefPtr<nsPrefetchNode> enqueuedNode;
rv = EnqueueURI(aURI, aReferrerInfo, aSource, getter_AddRefs(enqueuedNode));
NS_ENSURE_SUCCESS(rv, rv);
NotifyLoadRequested(enqueuedNode);
// if there are no pages loading, kick off the request immediately
if ((!mStopCount && mHaveProcessed) || mAggressive) {
ProcessNextPrefetchURI();
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::CancelPrefetchPreloadURI(nsIURI* aURI, nsINode* aSource) {
NS_ENSURE_ARG_POINTER(aURI);
if (LOG_ENABLED()) {
LOG(("CancelPrefetchURI [%s]\n", aURI->GetSpecOrDefault().get()));
}
//
// look in current prefetches
//
for (uint32_t i = 0; i < mCurrentNodes.Length(); ++i) {
bool equals;
if (NS_SUCCEEDED(mCurrentNodes[i]->mURI->Equals(aURI, &equals)) && equals) {
nsWeakPtr source = do_GetWeakReference(aSource);
if (mCurrentNodes[i]->mSources.IndexOf(source) !=
mCurrentNodes[i]->mSources.NoIndex) {
mCurrentNodes[i]->mSources.RemoveElement(source);
if (mCurrentNodes[i]->mSources.IsEmpty()) {
mCurrentNodes[i]->CancelChannel(NS_BINDING_ABORTED);
mCurrentNodes.RemoveElementAt(i);
}
return NS_OK;
}
return NS_ERROR_FAILURE;
}
}
//
// look into the prefetch queue
//
for (std::deque<RefPtr<nsPrefetchNode>>::iterator nodeIt =
mPrefetchQueue.begin();
nodeIt != mPrefetchQueue.end(); nodeIt++) {
bool equals;
RefPtr<nsPrefetchNode> node = nodeIt->get();
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
nsWeakPtr source = do_GetWeakReference(aSource);
if (node->mSources.IndexOf(source) != node->mSources.NoIndex) {
#ifdef DEBUG
int32_t inx = node->mSources.IndexOf(source);
nsCOMPtr<nsINode> domNode =
do_QueryReferent(node->mSources.ElementAt(inx));
MOZ_ASSERT(domNode);
#endif
node->mSources.RemoveElement(source);
if (node->mSources.IsEmpty()) {
mPrefetchQueue.erase(nodeIt);
}
return NS_OK;
}
return NS_ERROR_FAILURE;
}
}
// not found!
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsPrefetchService::PreloadURI(nsIURI* aURI, nsIReferrerInfo* aReferrerInfo,
nsINode* aSource,
nsContentPolicyType aPolicyType) {
return Preload(aURI, aReferrerInfo, aSource, aPolicyType);
}
NS_IMETHODIMP
nsPrefetchService::PrefetchURI(nsIURI* aURI, nsIReferrerInfo* aReferrerInfo,
nsINode* aSource, bool aExplicit) {
return Prefetch(aURI, aReferrerInfo, aSource, aExplicit);
}
NS_IMETHODIMP
nsPrefetchService::HasMoreElements(bool* aHasMore) {
*aHasMore = (mCurrentNodes.Length() || !mPrefetchQueue.empty());
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIWebProgressListener
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchService::OnProgressChange(nsIWebProgress* aProgress,
nsIRequest* aRequest,
int32_t curSelfProgress,
int32_t maxSelfProgress,
int32_t curTotalProgress,
int32_t maxTotalProgress) {
MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnStateChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
uint32_t progressStateFlags,
nsresult aStatus) {
if (progressStateFlags & STATE_IS_DOCUMENT) {
if (progressStateFlags & STATE_STOP)
StartPrefetching();
else if (progressStateFlags & STATE_START)
StopPrefetching();
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnLocationChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, nsIURI* location,
uint32_t aFlags) {
MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnStatusChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, nsresult aStatus,
const char16_t* aMessage) {
MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnSecurityChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest, uint32_t aState) {
MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnContentBlockingEvent(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
uint32_t aEvent) {
MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIObserver
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsPrefetchService::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
LOG(("nsPrefetchService::Observe [topic=%s]\n", aTopic));
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
StopAll();
mPrefetchDisabled = true;
} else if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
const nsCString converted = NS_ConvertUTF16toUTF8(aData);
const char* pref = converted.get();
if (!strcmp(pref, PREFETCH_PREF)) {
if (Preferences::GetBool(PREFETCH_PREF, false)) {
if (mPrefetchDisabled) {
LOG(("enabling prefetching\n"));
mPrefetchDisabled = false;
AddProgressListener();
}
} else {
if (!mPrefetchDisabled) {
LOG(("disabling prefetching\n"));
StopCurrentPrefetchsPreloads(false);
mPrefetchDisabled = true;
RemoveProgressListener();
}
}
} else if (!strcmp(pref, PARALLELISM_PREF)) {
mMaxParallelism = Preferences::GetInt(PARALLELISM_PREF, mMaxParallelism);
if (mMaxParallelism < 1) {
mMaxParallelism = 1;
}
// If our parallelism has increased, go ahead and kick off enough
// prefetches to fill up our allowance. If we're now over our
// allowance, we'll just silently let some of them finish to get
// back below our limit.
while (((!mStopCount && mHaveProcessed) || mAggressive) &&
!mPrefetchQueue.empty() &&
mCurrentNodes.Length() < static_cast<uint32_t>(mMaxParallelism)) {
ProcessNextPrefetchURI();
}
} else if (!strcmp(pref, AGGRESSIVE_PREF)) {
mAggressive = Preferences::GetBool(AGGRESSIVE_PREF, false);
// in aggressive mode, start prefetching immediately
if (mAggressive) {
while (mStopCount && !mPrefetchQueue.empty() &&
mCurrentNodes.Length() <
static_cast<uint32_t>(mMaxParallelism)) {
ProcessNextPrefetchURI();
}
}
}
}
return NS_OK;
}
// vim: ts=4 sw=2 expandtab
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