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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 "nsICacheEntry.h"
#include "nsIServiceManager.h"
#include "nsICategoryManager.h"
#include "nsIObserverService.h"
#include "nsIWebProgress.h"
#include "nsCURILoader.h"
#include "nsICacheInfoChannel.h"
#include "nsIHttpChannel.h"
#include "nsIURL.h"
#include "nsISimpleEnumerator.h"
#include "nsNetUtil.h"
#include "nsString.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsStreamUtils.h"
#include "nsAutoPtr.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "plstr.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "mozilla/Preferences.h"
#include "mozilla/Attributes.h"
#include "mozilla/CORSMode.h"
#include "mozilla/dom/HTMLLinkElement.h"
#include "nsIDOMNode.h"
#include "nsINode.h"
#include "nsIDocument.h"
#include "nsContentUtils.h"
using namespace mozilla;
//
// To enable logging (see mozilla/Logging.h for full details):
//
// set NSPR_LOG_MODULES=nsPrefetch:5
// set NSPR_LOG_FILE=prefetch.log
//
// this enables LogLevel::Debug level information and places all output in
// the file http.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"
//-----------------------------------------------------------------------------
// helpers
//-----------------------------------------------------------------------------
static inline uint32_t
PRTimeToSeconds(PRTime t_usec)
{
PRTime usec_per_sec = PR_USEC_PER_SEC;
return uint32_t(t_usec /= usec_per_sec);
}
#define NowInSeconds() PRTimeToSeconds(PR_Now())
//-----------------------------------------------------------------------------
// nsPrefetchNode <public>
//-----------------------------------------------------------------------------
nsPrefetchNode::nsPrefetchNode(nsPrefetchService *aService,
nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource)
: mURI(aURI)
, mReferrerURI(aReferrerURI)
, mService(aService)
, mChannel(nullptr)
, mBytesRead(0)
{
nsCOMPtr<nsIWeakReference> 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 (source->IsHTMLElement(nsGkAtoms::link)) {
corsMode = static_cast<dom::HTMLLinkElement*>(source.get())->GetCORSMode();
}
uint32_t securityFlags;
if (corsMode == CORS_NONE) {
securityFlags = nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS;
} else {
securityFlags = nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
if (corsMode == CORS_USE_CREDENTIALS) {
securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
}
}
nsresult rv = NS_NewChannelInternal(getter_AddRefs(mChannel),
mURI,
source,
source->NodePrincipal(),
nullptr, //aTriggeringPrincipal
securityFlags,
nsIContentPolicy::TYPE_OTHER,
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) {
httpChannel->SetReferrer(mReferrerURI);
httpChannel->SetRequestHeader(
NS_LITERAL_CSTRING("X-Moz"),
NS_LITERAL_CSTRING("prefetch"),
false);
}
return mChannel->AsyncOpen2(this);
}
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,
nsISupports *aContext)
{
nsresult rv;
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"));
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 (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,
nsISupports *aContext,
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=%llu]\n", bytesRead, aOffset));
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchNode::OnStopRequest(nsIRequest *aRequest,
nsISupports *aContext,
nsresult aStatus)
{
LOG(("done prefetching [status=%x]\n", 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->ProcessNextURI(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;
bool match;
rv = newURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = newURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
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);
httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
NS_LITERAL_CSTRING("prefetch"),
false);
// 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(bool proceeding)
{
if (proceeding && mRedirectChannel)
mChannel = mRedirectChannel;
mRedirectChannel = nullptr;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsPrefetchService <public>
//-----------------------------------------------------------------------------
nsPrefetchService::nsPrefetchService()
: mMaxParallelism(6)
, mStopCount(0)
, mHaveProcessed(false)
, mDisabled(true)
{
}
nsPrefetchService::~nsPrefetchService()
{
Preferences::RemoveObserver(this, PREFETCH_PREF);
Preferences::RemoveObserver(this, PARALLELISM_PREF);
// cannot reach destructor if prefetch in progress (listener owns reference
// to this service)
EmptyQueue();
}
nsresult
nsPrefetchService::Init()
{
nsresult rv;
// read prefs and hook up pref observer
mDisabled = !Preferences::GetBool(PREFETCH_PREF, !mDisabled);
Preferences::AddWeakObserver(this, PREFETCH_PREF);
mMaxParallelism = Preferences::GetInt(PARALLELISM_PREF, mMaxParallelism);
if (mMaxParallelism < 1) {
mMaxParallelism = 1;
}
Preferences::AddWeakObserver(this, PARALLELISM_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 (!mDisabled)
AddProgressListener();
return NS_OK;
}
void
nsPrefetchService::ProcessNextURI(nsPrefetchNode *aFinished)
{
nsresult rv;
nsCOMPtr<nsIURI> uri, referrer;
if (aFinished) {
mCurrentNodes.RemoveElement(aFinished);
}
if (mCurrentNodes.Length() >= static_cast<uint32_t>(mMaxParallelism)) {
// We already have enough prefetches going on, so hold off
// for now.
return;
}
do {
if (mQueue.empty()) {
break;
}
RefPtr<nsPrefetchNode> node = mQueue.front().forget();
mQueue.pop_front();
if (LOG_ENABLED()) {
nsAutoCString spec;
node->mURI->GetSpec(spec);
LOG(("ProcessNextURI [%s]\n", spec.get()));
}
//
// if opening the channel fails, then just skip to the next uri
//
rv = node->OpenChannel();
if (NS_SUCCEEDED(rv)) {
mCurrentNodes.AppendElement(node);
}
}
while (NS_FAILED(rv));
}
void
nsPrefetchService::NotifyLoadRequested(nsPrefetchNode *node)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return;
observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
"prefetch-load-requested", nullptr);
}
void
nsPrefetchService::NotifyLoadCompleted(nsPrefetchNode *node)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return;
observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
"prefetch-load-completed", nullptr);
}
//-----------------------------------------------------------------------------
// nsPrefetchService <private>
//-----------------------------------------------------------------------------
void
nsPrefetchService::AddProgressListener()
{
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (progress)
progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
}
void
nsPrefetchService::RemoveProgressListener()
{
// Register as an observer for the document loader
nsCOMPtr<nsIWebProgress> progress =
do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
if (progress)
progress->RemoveProgressListener(this);
}
nsresult
nsPrefetchService::EnqueueURI(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
nsPrefetchNode **aNode)
{
RefPtr<nsPrefetchNode> node = new nsPrefetchNode(this, aURI, aReferrerURI,
aSource);
mQueue.push_back(node);
node.forget(aNode);
return NS_OK;
}
void
nsPrefetchService::EmptyQueue()
{
while (!mQueue.empty()) {
mQueue.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 (!mQueue.empty() && mCurrentNodes.Length() < static_cast<uint32_t>(mMaxParallelism)) {
ProcessNextURI(nullptr);
}
}
}
void
nsPrefetchService::StopPrefetching()
{
mStopCount++;
LOG(("StopPrefetching [stopcount=%d]\n", mStopCount));
// only kill the prefetch queue if we are actively prefetching right now
if (mCurrentNodes.IsEmpty()) {
return;
}
for (uint32_t i = 0; i < mCurrentNodes.Length(); ++i) {
mCurrentNodes[i]->CancelChannel(NS_BINDING_ABORTED);
}
mCurrentNodes.Clear();
EmptyQueue();
}
//-----------------------------------------------------------------------------
// nsPrefetchService::nsISupports
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsPrefetchService,
nsIPrefetchService,
nsIWebProgressListener,
nsIObserver,
nsISupportsWeakReference)
//-----------------------------------------------------------------------------
// nsPrefetchService::nsIPrefetchService
//-----------------------------------------------------------------------------
nsresult
nsPrefetchService::Prefetch(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
bool aExplicit)
{
nsresult rv;
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_ARG_POINTER(aReferrerURI);
if (LOG_ENABLED()) {
nsAutoCString spec;
aURI->GetSpec(spec);
LOG(("PrefetchURI [%s]\n", spec.get()));
}
if (mDisabled) {
LOG(("rejected: prefetch service is disabled\n"));
return NS_ERROR_ABORT;
}
//
// 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 links since we know that's the
// most common case. ignore https links since https content only goes
// into the memory cache.
//
// XXX we might want to either leverage nsIProtocolHandler::protocolFlags
// or possibly nsIRequest::loadFlags to determine if this URI should be
// prefetched.
//
bool match;
rv = aURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = aURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
LOG(("rejected: URL is not of type http/https\n"));
return NS_ERROR_ABORT;
}
}
//
// the referrer URI must be http:
//
rv = aReferrerURI->SchemeIs("http", &match);
if (NS_FAILED(rv) || !match) {
rv = aReferrerURI->SchemeIs("https", &match);
if (NS_FAILED(rv) || !match) {
LOG(("rejected: referrer URL is neither http nor https\n"));
return NS_ERROR_ABORT;
}
}
// 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) {
nsCOMPtr<nsIWeakReference> 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 = mQueue.begin();
nodeIt != mQueue.end(); nodeIt++) {
bool equals;
RefPtr<nsPrefetchNode> node = nodeIt->get();
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
nsCOMPtr<nsIWeakReference> 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, aReferrerURI, aSource,
getter_AddRefs(enqueuedNode));
NS_ENSURE_SUCCESS(rv, rv);
NotifyLoadRequested(enqueuedNode);
// if there are no pages loading, kick off the request immediately
if (mStopCount == 0 && mHaveProcessed) {
ProcessNextURI(nullptr);
}
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::CancelPrefetchURI(nsIURI* aURI,
nsIDOMNode* aSource)
{
NS_ENSURE_ARG_POINTER(aURI);
if (LOG_ENABLED()) {
nsAutoCString spec;
aURI->GetSpec(spec);
LOG(("CancelPrefetchURI [%s]\n", spec.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) {
nsCOMPtr<nsIWeakReference> 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 = mQueue.begin();
nodeIt != mQueue.end(); nodeIt++) {
bool equals;
RefPtr<nsPrefetchNode> node = nodeIt->get();
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
nsCOMPtr<nsIWeakReference> source = do_GetWeakReference(aSource);
if (node->mSources.IndexOf(source) !=
node->mSources.NoIndex) {
#ifdef DEBUG
int32_t inx = node->mSources.IndexOf(source);
nsCOMPtr<nsIDOMNode> domNode =
do_QueryReferent(node->mSources.ElementAt(inx));
MOZ_ASSERT(domNode);
#endif
node->mSources.RemoveElement(source);
if (node->mSources.IsEmpty()) {
mQueue.erase(nodeIt);
}
return NS_OK;
}
return NS_ERROR_FAILURE;
}
}
// not found!
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsPrefetchService::PrefetchURI(nsIURI *aURI,
nsIURI *aReferrerURI,
nsIDOMNode *aSource,
bool aExplicit)
{
return Prefetch(aURI, aReferrerURI, aSource, aExplicit);
}
NS_IMETHODIMP
nsPrefetchService::HasMoreElements(bool *aHasMore)
{
*aHasMore = (mCurrentNodes.Length() || !mQueue.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)
{
NS_NOTREACHED("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)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnStatusChange(nsIWebProgress* aWebProgress,
nsIRequest* aRequest,
nsresult aStatus,
const char16_t* aMessage)
{
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
return NS_OK;
}
NS_IMETHODIMP
nsPrefetchService::OnSecurityChange(nsIWebProgress *aWebProgress,
nsIRequest *aRequest,
uint32_t state)
{
NS_NOTREACHED("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)) {
StopPrefetching();
EmptyQueue();
mDisabled = true;
}
else if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
const char *pref = NS_ConvertUTF16toUTF8(aData).get();
if (!strcmp(pref, PREFETCH_PREF)) {
if (Preferences::GetBool(PREFETCH_PREF, false)) {
if (mDisabled) {
LOG(("enabling prefetching\n"));
mDisabled = false;
AddProgressListener();
}
} else {
if (!mDisabled) {
LOG(("disabling prefetching\n"));
StopPrefetching();
EmptyQueue();
mDisabled = 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 (!mQueue.empty() && mCurrentNodes.Length() < static_cast<uint32_t>(mMaxParallelism)) {
ProcessNextURI(nullptr);
}
}
}
return NS_OK;
}
// vim: ts=4 sw=4 expandtab
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