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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/prerender/prerender_manager.h"
#include <algorithm>
#include <functional>
#include <string>
#include <vector>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/histogram.h"
#include "base/prefs/pref_service.h"
#include "base/stl_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/common/cancelable_request.h"
#include "chrome/browser/history/history_service_factory.h"
#include "chrome/browser/net/chrome_cookie_notification_details.h"
#include "chrome/browser/predictors/predictor_database.h"
#include "chrome/browser/predictors/predictor_database_factory.h"
#include "chrome/browser/prerender/prerender_condition.h"
#include "chrome/browser/prerender/prerender_contents.h"
#include "chrome/browser/prerender/prerender_field_trial.h"
#include "chrome/browser/prerender/prerender_final_status.h"
#include "chrome/browser/prerender/prerender_handle.h"
#include "chrome/browser/prerender/prerender_histograms.h"
#include "chrome/browser/prerender/prerender_history.h"
#include "chrome/browser/prerender/prerender_local_predictor.h"
#include "chrome/browser/prerender/prerender_manager_factory.h"
#include "chrome/browser/prerender/prerender_tab_helper.h"
#include "chrome/browser/prerender/prerender_tracker.h"
#include "chrome/browser/prerender/prerender_util.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search/search.h"
#include "chrome/browser/tab_contents/tab_util.h"
#include "chrome/browser/ui/browser_navigator.h"
#include "chrome/browser/ui/tab_contents/core_tab_helper.h"
#include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/prerender_messages.h"
#include "chrome/common/prerender_types.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/devtools_agent_host.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/session_storage_namespace.h"
#include "content/public/browser/site_instance.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/common/url_constants.h"
#include "extensions/common/constants.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
using content::BrowserThread;
using content::RenderViewHost;
using content::RenderFrameHost;
using content::SessionStorageNamespace;
using content::WebContents;
using predictors::LoggedInPredictorTable;
namespace prerender {
namespace {
// Time interval at which periodic cleanups are performed.
const int kPeriodicCleanupIntervalMs = 1000;
// Valid HTTP methods for prerendering.
const char* const kValidHttpMethods[] = {
"GET",
"HEAD",
"OPTIONS",
"POST",
"TRACE",
};
// Length of prerender history, for display in chrome://net-internals
const int kHistoryLength = 100;
// Timeout, in ms, for a session storage namespace merge.
const int kSessionStorageNamespaceMergeTimeoutMs = 500;
// If true, all session storage merges hang indefinitely.
bool g_hang_session_storage_merges_for_testing = false;
// Indicates whether a Prerender has been cancelled such that we need
// a dummy replacement for the purpose of recording the correct PPLT for
// the Match Complete case.
// Traditionally, "Match" means that a prerendered page was actually visited &
// the prerender was used. Our goal is to have "Match" cases line up in the
// control group & the experiment group, so that we can make meaningful
// comparisons of improvements. However, in the control group, since we don't
// actually perform prerenders, many of the cancellation reasons cannot be
// detected. Therefore, in the Prerender group, when we cancel for one of these
// reasons, we keep track of a dummy Prerender representing what we would
// have in the control group. If that dummy prerender in the prerender group
// would then be swapped in (but isn't actually b/c it's a dummy), we record
// this as a MatchComplete. This allows us to compare MatchComplete's
// across Prerender & Control group which ideally should be lining up.
// This ensures that there is no bias in terms of the page load times
// of the pages forming the difference between the two sets.
bool NeedMatchCompleteDummyForFinalStatus(FinalStatus final_status) {
return final_status != FINAL_STATUS_USED &&
final_status != FINAL_STATUS_TIMED_OUT &&
final_status != FINAL_STATUS_MANAGER_SHUTDOWN &&
final_status != FINAL_STATUS_PROFILE_DESTROYED &&
final_status != FINAL_STATUS_APP_TERMINATING &&
final_status != FINAL_STATUS_WINDOW_OPENER &&
final_status != FINAL_STATUS_CACHE_OR_HISTORY_CLEARED &&
final_status != FINAL_STATUS_CANCELLED &&
final_status != FINAL_STATUS_DEVTOOLS_ATTACHED &&
final_status != FINAL_STATUS_CROSS_SITE_NAVIGATION_PENDING &&
final_status != FINAL_STATUS_PAGE_BEING_CAPTURED &&
final_status != FINAL_STATUS_NAVIGATION_UNCOMMITTED &&
final_status != FINAL_STATUS_NON_EMPTY_BROWSING_INSTANCE;
}
void CheckIfCookiesExistForDomainResultOnUIThread(
const net::CookieMonster::HasCookiesForETLDP1Callback& callback,
bool cookies_exist) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
callback.Run(cookies_exist);
}
void CheckIfCookiesExistForDomainResultOnIOThread(
const net::CookieMonster::HasCookiesForETLDP1Callback& callback,
bool cookies_exist) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
base::Bind(&CheckIfCookiesExistForDomainResultOnUIThread,
callback,
cookies_exist));
}
void CheckIfCookiesExistForDomainOnIOThread(
net::URLRequestContextGetter* rq_context,
const std::string& domain_key,
const net::CookieMonster::HasCookiesForETLDP1Callback& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
net::CookieStore* cookie_store =
rq_context->GetURLRequestContext()->cookie_store();
cookie_store->GetCookieMonster()->HasCookiesForETLDP1Async(
domain_key,
base::Bind(&CheckIfCookiesExistForDomainResultOnIOThread, callback));
}
} // namespace
class PrerenderManager::OnCloseWebContentsDeleter
: public content::WebContentsDelegate,
public base::SupportsWeakPtr<
PrerenderManager::OnCloseWebContentsDeleter> {
public:
OnCloseWebContentsDeleter(PrerenderManager* manager,
WebContents* tab)
: manager_(manager),
tab_(tab),
suppressed_dialog_(false) {
tab_->SetDelegate(this);
base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
base::Bind(&OnCloseWebContentsDeleter::ScheduleWebContentsForDeletion,
AsWeakPtr(), true),
base::TimeDelta::FromSeconds(kDeleteWithExtremePrejudiceSeconds));
}
virtual void CloseContents(WebContents* source) OVERRIDE {
DCHECK_EQ(tab_, source);
ScheduleWebContentsForDeletion(false);
}
virtual void SwappedOut(WebContents* source) OVERRIDE {
DCHECK_EQ(tab_, source);
ScheduleWebContentsForDeletion(false);
}
virtual bool ShouldSuppressDialogs() OVERRIDE {
// Use this as a proxy for getting statistics on how often we fail to honor
// the beforeunload event.
suppressed_dialog_ = true;
return true;
}
private:
static const int kDeleteWithExtremePrejudiceSeconds = 3;
void ScheduleWebContentsForDeletion(bool timeout) {
UMA_HISTOGRAM_BOOLEAN("Prerender.TabContentsDeleterTimeout", timeout);
UMA_HISTOGRAM_BOOLEAN("Prerender.TabContentsDeleterSuppressedDialog",
suppressed_dialog_);
tab_->SetDelegate(NULL);
manager_->ScheduleDeleteOldWebContents(tab_.release(), this);
// |this| is deleted at this point.
}
PrerenderManager* manager_;
scoped_ptr<WebContents> tab_;
bool suppressed_dialog_;
DISALLOW_COPY_AND_ASSIGN(OnCloseWebContentsDeleter);
};
// static
int PrerenderManager::prerenders_per_session_count_ = 0;
// static
PrerenderManager::PrerenderManagerMode PrerenderManager::mode_ =
PRERENDER_MODE_ENABLED;
struct PrerenderManager::NavigationRecord {
NavigationRecord(const GURL& url, base::TimeTicks time)
: url(url),
time(time) {
}
GURL url;
base::TimeTicks time;
};
PrerenderManager::PrerenderManager(Profile* profile,
PrerenderTracker* prerender_tracker)
: enabled_(profile && profile->GetPrefs() &&
profile->GetPrefs()->GetBoolean(prefs::kNetworkPredictionEnabled)),
profile_(profile),
prerender_tracker_(prerender_tracker),
prerender_contents_factory_(PrerenderContents::CreateFactory()),
last_prerender_start_time_(GetCurrentTimeTicks() -
base::TimeDelta::FromMilliseconds(kMinTimeBetweenPrerendersMs)),
prerender_history_(new PrerenderHistory(kHistoryLength)),
histograms_(new PrerenderHistograms()),
profile_network_bytes_(0),
last_recorded_profile_network_bytes_(0),
cookie_store_loaded_(false) {
// There are some assumptions that the PrerenderManager is on the UI thread.
// Any other checks simply make sure that the PrerenderManager is accessed on
// the same thread that it was created on.
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (IsLocalPredictorEnabled())
local_predictor_.reset(new PrerenderLocalPredictor(this));
if (IsLoggedInPredictorEnabled() && !profile_->IsOffTheRecord()) {
predictors::PredictorDatabase* predictor_db =
predictors::PredictorDatabaseFactory::GetForProfile(profile);
if (predictor_db) {
logged_in_predictor_table_ = predictor_db->logged_in_table();
scoped_ptr<LoggedInStateMap> new_state_map(new LoggedInStateMap);
LoggedInStateMap* new_state_map_ptr = new_state_map.get();
BrowserThread::PostTaskAndReply(
BrowserThread::DB, FROM_HERE,
base::Bind(&LoggedInPredictorTable::GetAllData,
logged_in_predictor_table_,
new_state_map_ptr),
base::Bind(&PrerenderManager::LoggedInPredictorDataReceived,
AsWeakPtr(),
base::Passed(&new_state_map)));
}
}
// Certain experiments override our default config_ values.
switch (PrerenderManager::GetMode()) {
case PrerenderManager::PRERENDER_MODE_EXPERIMENT_MULTI_PRERENDER_GROUP:
config_.max_link_concurrency = 4;
config_.max_link_concurrency_per_launcher = 2;
break;
case PrerenderManager::PRERENDER_MODE_EXPERIMENT_15MIN_TTL_GROUP:
config_.time_to_live = base::TimeDelta::FromMinutes(15);
break;
default:
break;
}
notification_registrar_.Add(
this, chrome::NOTIFICATION_COOKIE_CHANGED,
content::NotificationService::AllBrowserContextsAndSources());
notification_registrar_.Add(
this, chrome::NOTIFICATION_PROFILE_DESTROYED,
content::Source<Profile>(profile_));
MediaCaptureDevicesDispatcher::GetInstance()->AddObserver(this);
}
PrerenderManager::~PrerenderManager() {
MediaCaptureDevicesDispatcher::GetInstance()->RemoveObserver(this);
// The earlier call to KeyedService::Shutdown() should have
// emptied these vectors already.
DCHECK(active_prerenders_.empty());
DCHECK(to_delete_prerenders_.empty());
for (PrerenderProcessSet::const_iterator it =
prerender_process_hosts_.begin();
it != prerender_process_hosts_.end();
++it) {
(*it)->RemoveObserver(this);
}
}
void PrerenderManager::Shutdown() {
DestroyAllContents(FINAL_STATUS_MANAGER_SHUTDOWN);
STLDeleteElements(&prerender_conditions_);
on_close_web_contents_deleters_.clear();
// Must happen before |profile_| is set to NULL as
// |local_predictor_| accesses it.
if (local_predictor_)
local_predictor_->Shutdown();
profile_ = NULL;
DCHECK(active_prerenders_.empty());
}
PrerenderHandle* PrerenderManager::AddPrerenderFromLinkRelPrerender(
int process_id,
int route_id,
const GURL& url,
const uint32 rel_types,
const content::Referrer& referrer,
const gfx::Size& size) {
Origin origin = rel_types & PrerenderRelTypePrerender ?
ORIGIN_LINK_REL_PRERENDER_CROSSDOMAIN :
ORIGIN_LINK_REL_NEXT;
SessionStorageNamespace* session_storage_namespace = NULL;
// Unit tests pass in a process_id == -1.
if (process_id != -1) {
RenderViewHost* source_render_view_host =
RenderViewHost::FromID(process_id, route_id);
if (!source_render_view_host)
return NULL;
WebContents* source_web_contents =
WebContents::FromRenderViewHost(source_render_view_host);
if (!source_web_contents)
return NULL;
if (origin == ORIGIN_LINK_REL_PRERENDER_CROSSDOMAIN &&
source_web_contents->GetURL().host() == url.host()) {
origin = ORIGIN_LINK_REL_PRERENDER_SAMEDOMAIN;
}
// TODO(ajwong): This does not correctly handle storage for isolated apps.
session_storage_namespace =
source_web_contents->GetController()
.GetDefaultSessionStorageNamespace();
}
return AddPrerender(origin, process_id, url, referrer, size,
session_storage_namespace);
}
PrerenderHandle* PrerenderManager::AddPrerenderFromOmnibox(
const GURL& url,
SessionStorageNamespace* session_storage_namespace,
const gfx::Size& size) {
if (!IsOmniboxEnabled(profile_))
return NULL;
return AddPrerender(ORIGIN_OMNIBOX, -1, url, content::Referrer(), size,
session_storage_namespace);
}
PrerenderHandle* PrerenderManager::AddPrerenderFromLocalPredictor(
const GURL& url,
SessionStorageNamespace* session_storage_namespace,
const gfx::Size& size) {
return AddPrerender(ORIGIN_LOCAL_PREDICTOR, -1, url, content::Referrer(),
size, session_storage_namespace);
}
PrerenderHandle* PrerenderManager::AddPrerenderFromExternalRequest(
const GURL& url,
const content::Referrer& referrer,
SessionStorageNamespace* session_storage_namespace,
const gfx::Size& size) {
return AddPrerender(ORIGIN_EXTERNAL_REQUEST, -1, url, referrer, size,
session_storage_namespace);
}
PrerenderHandle* PrerenderManager::AddPrerenderForInstant(
const GURL& url,
content::SessionStorageNamespace* session_storage_namespace,
const gfx::Size& size) {
DCHECK(chrome::ShouldPrefetchSearchResults());
return AddPrerender(ORIGIN_INSTANT, -1, url, content::Referrer(), size,
session_storage_namespace);
}
void PrerenderManager::CancelAllPrerenders() {
DCHECK(CalledOnValidThread());
while (!active_prerenders_.empty()) {
PrerenderContents* prerender_contents =
active_prerenders_.front()->contents();
prerender_contents->Destroy(FINAL_STATUS_CANCELLED);
}
}
bool PrerenderManager::MaybeUsePrerenderedPage(const GURL& url,
chrome::NavigateParams* params) {
DCHECK(CalledOnValidThread());
content::WebContents* web_contents = params->target_contents;
DCHECK(!IsWebContentsPrerendering(web_contents, NULL));
// Don't prerender if the navigation involves some special parameters.
if (params->uses_post || !params->extra_headers.empty())
return false;
DeleteOldEntries();
to_delete_prerenders_.clear();
// First, try to find prerender data with the correct session storage
// namespace.
// TODO(ajwong): This doesn't handle isolated apps correctly.
PrerenderData* prerender_data = FindPrerenderData(
url,
web_contents->GetController().GetDefaultSessionStorageNamespace());
// If this failed, we may still find a prerender for the same URL, but a
// different session storage namespace. If we do, we might have to perform
// a merge.
if (!prerender_data) {
prerender_data = FindPrerenderData(url, NULL);
} else {
RecordEvent(prerender_data->contents(),
PRERENDER_EVENT_SWAPIN_CANDIDATE_NAMESPACE_MATCHES);
}
if (!prerender_data)
return false;
RecordEvent(prerender_data->contents(), PRERENDER_EVENT_SWAPIN_CANDIDATE);
DCHECK(prerender_data->contents());
// If there is currently a merge pending for this prerender data, don't swap.
if (prerender_data->pending_swap())
return false;
// Abort any existing pending swap on the target contents.
PrerenderData* pending_swap =
FindPrerenderDataForTargetContents(web_contents);
if (pending_swap) {
pending_swap->ClearPendingSwap();
DCHECK(FindPrerenderDataForTargetContents(web_contents) == NULL);
}
RecordEvent(prerender_data->contents(),
PRERENDER_EVENT_SWAPIN_NO_MERGE_PENDING);
SessionStorageNamespace* target_namespace =
web_contents->GetController().GetDefaultSessionStorageNamespace();
SessionStorageNamespace* prerender_namespace =
prerender_data->contents()->GetSessionStorageNamespace();
// Only when actually prerendering is session storage namespace merging an
// issue. For the control group, it will be assumed that the merge succeeded.
if (prerender_namespace && prerender_namespace != target_namespace &&
!prerender_namespace->IsAliasOf(target_namespace)) {
if (!ShouldMergeSessionStorageNamespaces()) {
RecordEvent(prerender_data->contents(),
PRERENDER_EVENT_SWAPIN_MERGING_DISABLED);
return false;
}
RecordEvent(prerender_data->contents(),
PRERENDER_EVENT_SWAPIN_ISSUING_MERGE);
prerender_data->set_pending_swap(new PendingSwap(
this, web_contents, prerender_data, url,
params->should_replace_current_entry));
prerender_data->pending_swap()->BeginSwap();
// Although this returns false, creating a PendingSwap registers with
// PrerenderTracker to throttle MAIN_FRAME navigations while the swap is
// pending.
return false;
}
// No need to merge; swap synchronously.
WebContents* new_web_contents = SwapInternal(
url, web_contents, prerender_data,
params->should_replace_current_entry);
if (!new_web_contents)
return false;
// Record the new target_contents for the callers.
params->target_contents = new_web_contents;
return true;
}
WebContents* PrerenderManager::SwapInternal(
const GURL& url,
WebContents* web_contents,
PrerenderData* prerender_data,
bool should_replace_current_entry) {
DCHECK(CalledOnValidThread());
DCHECK(!IsWebContentsPrerendering(web_contents, NULL));
// Only swap if the target WebContents has a CoreTabHelper delegate to swap
// out of it. For a normal WebContents, this is if it is in a TabStripModel.
CoreTabHelper* core_tab_helper = CoreTabHelper::FromWebContents(web_contents);
if (!core_tab_helper || !core_tab_helper->delegate()) {
RecordEvent(prerender_data->contents(), PRERENDER_EVENT_SWAPIN_NO_DELEGATE);
return NULL;
}
PrerenderTabHelper* target_tab_helper =
PrerenderTabHelper::FromWebContents(web_contents);
if (!target_tab_helper) {
NOTREACHED();
return NULL;
}
if (IsNoSwapInExperiment(prerender_data->contents()->experiment_id()))
return NULL;
if (WebContents* new_web_contents =
prerender_data->contents()->prerender_contents()) {
if (web_contents == new_web_contents)
return NULL; // Do not swap in to ourself.
// We cannot swap in if there is no last committed entry, because we would
// show a blank page under an existing entry from the current tab. Even if
// there is a pending entry, it may not commit.
// TODO(creis): If there is a pending navigation and no last committed
// entry, we might be able to transfer the network request instead.
if (!new_web_contents->GetController().CanPruneAllButLastCommitted()) {
// Abort this prerender so it is not used later. http://crbug.com/292121
prerender_data->contents()->Destroy(FINAL_STATUS_NAVIGATION_UNCOMMITTED);
return NULL;
}
}
// Do not swap if the target WebContents is not the only WebContents in its
// current BrowsingInstance.
if (web_contents->GetSiteInstance()->GetRelatedActiveContentsCount() != 1u) {
DCHECK_GT(
web_contents->GetSiteInstance()->GetRelatedActiveContentsCount(), 1u);
prerender_data->contents()->Destroy(
FINAL_STATUS_NON_EMPTY_BROWSING_INSTANCE);
return NULL;
}
// Do not use the prerendered version if there is an opener object.
if (web_contents->HasOpener()) {
prerender_data->contents()->Destroy(FINAL_STATUS_WINDOW_OPENER);
return NULL;
}
// Do not swap in the prerender if the current WebContents is being captured.
if (web_contents->GetCapturerCount() > 0) {
prerender_data->contents()->Destroy(FINAL_STATUS_PAGE_BEING_CAPTURED);
return NULL;
}
// If we are just in the control group (which can be detected by noticing
// that prerendering hasn't even started yet), record that |web_contents| now
// would be showing a prerendered contents, but otherwise, don't do anything.
if (!prerender_data->contents()->prerendering_has_started()) {
target_tab_helper->WouldHavePrerenderedNextLoad(
prerender_data->contents()->origin());
prerender_data->contents()->Destroy(FINAL_STATUS_WOULD_HAVE_BEEN_USED);
return NULL;
}
// Don't use prerendered pages if debugger is attached to the tab.
// See http://crbug.com/98541
if (content::DevToolsAgentHost::IsDebuggerAttached(web_contents)) {
DestroyAndMarkMatchCompleteAsUsed(prerender_data->contents(),
FINAL_STATUS_DEVTOOLS_ATTACHED);
return NULL;
}
// If the prerendered page is in the middle of a cross-site navigation,
// don't swap it in because there isn't a good way to merge histories.
if (prerender_data->contents()->IsCrossSiteNavigationPending()) {
DestroyAndMarkMatchCompleteAsUsed(
prerender_data->contents(),
FINAL_STATUS_CROSS_SITE_NAVIGATION_PENDING);
return NULL;
}
// For bookkeeping purposes, we need to mark this WebContents to
// reflect that it would have been prerendered.
if (GetMode() == PRERENDER_MODE_EXPERIMENT_NO_USE_GROUP) {
target_tab_helper->WouldHavePrerenderedNextLoad(
prerender_data->contents()->origin());
prerender_data->contents()->Destroy(FINAL_STATUS_WOULD_HAVE_BEEN_USED);
return NULL;
}
// At this point, we've determined that we will use the prerender.
content::RenderProcessHost* process_host =
prerender_data->contents()->GetRenderViewHost()->GetProcess();
prerender_process_hosts_.erase(process_host);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&PrerenderTracker::RemovePrerenderCookieStoreOnIOThread,
base::Unretained(prerender_tracker()), process_host->GetID(),
true));
if (!prerender_data->contents()->load_start_time().is_null()) {
histograms_->RecordTimeUntilUsed(
prerender_data->contents()->origin(),
GetCurrentTimeTicks() - prerender_data->contents()->load_start_time());
}
histograms_->RecordAbandonTimeUntilUsed(
prerender_data->contents()->origin(),
prerender_data->abandon_time().is_null() ?
base::TimeDelta() :
GetCurrentTimeTicks() - prerender_data->abandon_time());
histograms_->RecordPerSessionCount(prerender_data->contents()->origin(),
++prerenders_per_session_count_);
histograms_->RecordUsedPrerender(prerender_data->contents()->origin());
if (prerender_data->pending_swap())
prerender_data->pending_swap()->set_swap_successful(true);
ScopedVector<PrerenderData>::iterator to_erase =
FindIteratorForPrerenderContents(prerender_data->contents());
DCHECK(active_prerenders_.end() != to_erase);
DCHECK_EQ(prerender_data, *to_erase);
scoped_ptr<PrerenderContents>
prerender_contents(prerender_data->ReleaseContents());
active_prerenders_.erase(to_erase);
// Mark prerender as used.
prerender_contents->PrepareForUse();
WebContents* new_web_contents =
prerender_contents->ReleasePrerenderContents();
WebContents* old_web_contents = web_contents;
DCHECK(new_web_contents);
DCHECK(old_web_contents);
// Merge the browsing history.
new_web_contents->GetController().CopyStateFromAndPrune(
&old_web_contents->GetController(),
should_replace_current_entry);
CoreTabHelper::FromWebContents(old_web_contents)->delegate()->
SwapTabContents(old_web_contents,
new_web_contents,
true,
prerender_contents->has_finished_loading());
prerender_contents->CommitHistory(new_web_contents);
// Update PPLT metrics:
// If the tab has finished loading, record a PPLT of 0.
// If the tab is still loading, reset its start time to the current time.
PrerenderTabHelper* prerender_tab_helper =
PrerenderTabHelper::FromWebContents(new_web_contents);
DCHECK(prerender_tab_helper != NULL);
prerender_tab_helper->PrerenderSwappedIn();
if (old_web_contents->NeedToFireBeforeUnload()) {
// Schedule the delete to occur after the tab has run its unload handlers.
// TODO(davidben): Honor the beforeunload event. http://crbug.com/304932
on_close_web_contents_deleters_.push_back(
new OnCloseWebContentsDeleter(this, old_web_contents));
old_web_contents->DispatchBeforeUnload(false);
} else {
// No unload handler to run, so delete asap.
ScheduleDeleteOldWebContents(old_web_contents, NULL);
}
// TODO(cbentzel): Should prerender_contents move to the pending delete
// list, instead of deleting directly here?
AddToHistory(prerender_contents.get());
RecordNavigation(url);
return new_web_contents;
}
void PrerenderManager::MoveEntryToPendingDelete(PrerenderContents* entry,
FinalStatus final_status) {
DCHECK(CalledOnValidThread());
DCHECK(entry);
ScopedVector<PrerenderData>::iterator it =
FindIteratorForPrerenderContents(entry);
DCHECK(it != active_prerenders_.end());
// If this PrerenderContents is being deleted due to a cancellation any time
// after the prerender has started then we need to create a dummy replacement
// for PPLT accounting purposes for the Match Complete group. This is the case
// if the cancellation is for any reason that would not occur in the control
// group case.
if (entry->prerendering_has_started() &&
entry->match_complete_status() ==
PrerenderContents::MATCH_COMPLETE_DEFAULT &&
NeedMatchCompleteDummyForFinalStatus(final_status) &&
ActuallyPrerendering()) {
// TODO(tburkard): I'd like to DCHECK that we are actually prerendering.
// However, what if new conditions are added and
// NeedMatchCompleteDummyForFinalStatus is not being updated. Not sure
// what's the best thing to do here. For now, I will just check whether
// we are actually prerendering.
(*it)->MakeIntoMatchCompleteReplacement();
} else {
to_delete_prerenders_.push_back(*it);
(*it)->ClearPendingSwap();
active_prerenders_.weak_erase(it);
}
// Destroy the old WebContents relatively promptly to reduce resource usage.
PostCleanupTask();
}
void PrerenderManager::RecordPageLoadTimeNotSwappedIn(
Origin origin,
base::TimeDelta page_load_time,
const GURL& url) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
histograms_->RecordPageLoadTimeNotSwappedIn(origin, page_load_time, url);
}
void PrerenderManager::RecordPerceivedPageLoadTime(
Origin origin,
NavigationType navigation_type,
base::TimeDelta perceived_page_load_time,
double fraction_plt_elapsed_at_swap_in,
const GURL& url) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!IsEnabled())
return;
histograms_->RecordPerceivedPageLoadTime(
origin, perceived_page_load_time, navigation_type, url);
if (navigation_type == NAVIGATION_TYPE_PRERENDERED) {
histograms_->RecordPercentLoadDoneAtSwapin(
origin, fraction_plt_elapsed_at_swap_in);
}
if (local_predictor_) {
local_predictor_->OnPLTEventForURL(url, perceived_page_load_time);
}
}
void PrerenderManager::set_enabled(bool enabled) {
DCHECK(CalledOnValidThread());
enabled_ = enabled;
}
// static
PrerenderManager::PrerenderManagerMode PrerenderManager::GetMode() {
return mode_;
}
// static
void PrerenderManager::SetMode(PrerenderManagerMode mode) {
mode_ = mode;
}
// static
const char* PrerenderManager::GetModeString() {
switch (mode_) {
case PRERENDER_MODE_DISABLED:
return "_Disabled";
case PRERENDER_MODE_ENABLED:
case PRERENDER_MODE_EXPERIMENT_PRERENDER_GROUP:
return "_Enabled";
case PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP:
return "_Control";
case PRERENDER_MODE_EXPERIMENT_MULTI_PRERENDER_GROUP:
return "_Multi";
case PRERENDER_MODE_EXPERIMENT_15MIN_TTL_GROUP:
return "_15MinTTL";
case PRERENDER_MODE_EXPERIMENT_NO_USE_GROUP:
return "_NoUse";
case PRERENDER_MODE_MAX:
default:
NOTREACHED() << "Invalid PrerenderManager mode.";
break;
}
return "";
}
// static
bool PrerenderManager::IsPrerenderingPossible() {
return GetMode() != PRERENDER_MODE_DISABLED;
}
// static
bool PrerenderManager::ActuallyPrerendering() {
return IsPrerenderingPossible() && !IsControlGroup(kNoExperiment);
}
// static
bool PrerenderManager::IsControlGroup(uint8 experiment_id) {
return GetMode() == PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP ||
IsControlGroupExperiment(experiment_id);
}
// static
bool PrerenderManager::IsNoUseGroup() {
return GetMode() == PRERENDER_MODE_EXPERIMENT_NO_USE_GROUP;
}
bool PrerenderManager::IsWebContentsPrerendering(
const WebContents* web_contents,
Origin* origin) const {
DCHECK(CalledOnValidThread());
if (PrerenderContents* prerender_contents =
GetPrerenderContents(web_contents)) {
if (origin)
*origin = prerender_contents->origin();
return true;
}
return false;
}
bool PrerenderManager::HasPrerenderedUrl(
GURL url,
content::WebContents* web_contents) const {
content::SessionStorageNamespace* session_storage_namespace = web_contents->
GetController().GetDefaultSessionStorageNamespace();
for (ScopedVector<PrerenderData>::const_iterator it =
active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
PrerenderContents* prerender_contents = (*it)->contents();
if (prerender_contents->Matches(url, session_storage_namespace)) {
return true;
}
}
return false;
}
PrerenderContents* PrerenderManager::GetPrerenderContents(
const content::WebContents* web_contents) const {
DCHECK(CalledOnValidThread());
for (ScopedVector<PrerenderData>::const_iterator it =
active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
WebContents* prerender_web_contents =
(*it)->contents()->prerender_contents();
if (prerender_web_contents == web_contents) {
return (*it)->contents();
}
}
// Also check the pending-deletion list. If the prerender is in pending
// delete, anyone with a handle on the WebContents needs to know.
for (ScopedVector<PrerenderData>::const_iterator it =
to_delete_prerenders_.begin();
it != to_delete_prerenders_.end(); ++it) {
WebContents* prerender_web_contents =
(*it)->contents()->prerender_contents();
if (prerender_web_contents == web_contents) {
return (*it)->contents();
}
}
return NULL;
}
PrerenderContents* PrerenderManager::GetPrerenderContentsForRoute(
int child_id,
int route_id) const {
content::WebContents* web_contents =
tab_util::GetWebContentsByID(child_id, route_id);
if (web_contents == NULL)
return NULL;
return GetPrerenderContents(web_contents);
}
const std::vector<WebContents*>
PrerenderManager::GetAllPrerenderingContents() const {
DCHECK(CalledOnValidThread());
std::vector<WebContents*> result;
for (ScopedVector<PrerenderData>::const_iterator it =
active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
if (WebContents* contents = (*it)->contents()->prerender_contents())
result.push_back(contents);
}
return result;
}
bool PrerenderManager::HasRecentlyBeenNavigatedTo(Origin origin,
const GURL& url) {
DCHECK(CalledOnValidThread());
CleanUpOldNavigations();
std::list<NavigationRecord>::const_reverse_iterator end = navigations_.rend();
for (std::list<NavigationRecord>::const_reverse_iterator it =
navigations_.rbegin();
it != end;
++it) {
if (it->url == url) {
base::TimeDelta delta = GetCurrentTimeTicks() - it->time;
histograms_->RecordTimeSinceLastRecentVisit(origin, delta);
return true;
}
}
return false;
}
// static
bool PrerenderManager::IsValidHttpMethod(const std::string& method) {
// method has been canonicalized to upper case at this point so we can just
// compare them.
DCHECK_EQ(method, StringToUpperASCII(method));
for (size_t i = 0; i < arraysize(kValidHttpMethods); ++i) {
if (method.compare(kValidHttpMethods[i]) == 0)
return true;
}
return false;
}
// static
bool PrerenderManager::DoesURLHaveValidScheme(const GURL& url) {
return (url.SchemeIsHTTPOrHTTPS() ||
url.SchemeIs(extensions::kExtensionScheme) ||
url.SchemeIs("data"));
}
// static
bool PrerenderManager::DoesSubresourceURLHaveValidScheme(const GURL& url) {
return DoesURLHaveValidScheme(url) || url == GURL(url::kAboutBlankURL);
}
base::DictionaryValue* PrerenderManager::GetAsValue() const {
DCHECK(CalledOnValidThread());
base::DictionaryValue* dict_value = new base::DictionaryValue();
dict_value->Set("history", prerender_history_->GetEntriesAsValue());
dict_value->Set("active", GetActivePrerendersAsValue());
dict_value->SetBoolean("enabled", enabled_);
dict_value->SetBoolean("omnibox_enabled", IsOmniboxEnabled(profile_));
// If prerender is disabled via a flag this method is not even called.
std::string enabled_note;
if (IsControlGroup(kNoExperiment))
enabled_note += "(Control group: Not actually prerendering) ";
if (IsNoUseGroup())
enabled_note += "(No-use group: Not swapping in prerendered pages) ";
if (GetMode() == PRERENDER_MODE_EXPERIMENT_15MIN_TTL_GROUP)
enabled_note +=
"(15 min TTL group: Extended prerender eviction to 15 mins) ";
dict_value->SetString("enabled_note", enabled_note);
return dict_value;
}
void PrerenderManager::ClearData(int clear_flags) {
DCHECK_GE(clear_flags, 0);
DCHECK_LT(clear_flags, CLEAR_MAX);
if (clear_flags & CLEAR_PRERENDER_CONTENTS)
DestroyAllContents(FINAL_STATUS_CACHE_OR_HISTORY_CLEARED);
// This has to be second, since destroying prerenders can add to the history.
if (clear_flags & CLEAR_PRERENDER_HISTORY)
prerender_history_->Clear();
}
void PrerenderManager::RecordFinalStatusWithMatchCompleteStatus(
Origin origin,
uint8 experiment_id,
PrerenderContents::MatchCompleteStatus mc_status,
FinalStatus final_status) const {
histograms_->RecordFinalStatus(origin,
experiment_id,
mc_status,
final_status);
}
void PrerenderManager::AddCondition(const PrerenderCondition* condition) {
prerender_conditions_.push_back(condition);
}
void PrerenderManager::RecordNavigation(const GURL& url) {
DCHECK(CalledOnValidThread());
navigations_.push_back(NavigationRecord(url, GetCurrentTimeTicks()));
CleanUpOldNavigations();
}
// protected
struct PrerenderManager::PrerenderData::OrderByExpiryTime {
bool operator()(const PrerenderData* a, const PrerenderData* b) const {
return a->expiry_time() < b->expiry_time();
}
};
PrerenderManager::PrerenderData::PrerenderData(PrerenderManager* manager,
PrerenderContents* contents,
base::TimeTicks expiry_time)
: manager_(manager),
contents_(contents),
handle_count_(0),
expiry_time_(expiry_time) {
DCHECK_NE(static_cast<PrerenderContents*>(NULL), contents_);
}
PrerenderManager::PrerenderData::~PrerenderData() {
}
void PrerenderManager::PrerenderData::MakeIntoMatchCompleteReplacement() {
DCHECK(contents_);
contents_->set_match_complete_status(
PrerenderContents::MATCH_COMPLETE_REPLACED);
PrerenderData* to_delete = new PrerenderData(manager_, contents_.release(),
expiry_time_);
contents_.reset(to_delete->contents_->CreateMatchCompleteReplacement());
manager_->to_delete_prerenders_.push_back(to_delete);
}
void PrerenderManager::PrerenderData::OnHandleCreated(PrerenderHandle* handle) {
DCHECK_NE(static_cast<PrerenderContents*>(NULL), contents_);
++handle_count_;
contents_->AddObserver(handle);
}
void PrerenderManager::PrerenderData::OnHandleNavigatedAway(
PrerenderHandle* handle) {
DCHECK_LT(0, handle_count_);
DCHECK_NE(static_cast<PrerenderContents*>(NULL), contents_);
if (abandon_time_.is_null())
abandon_time_ = base::TimeTicks::Now();
// We intentionally don't decrement the handle count here, so that the
// prerender won't be canceled until it times out.
manager_->SourceNavigatedAway(this);
}
void PrerenderManager::PrerenderData::OnHandleCanceled(
PrerenderHandle* handle) {
DCHECK_LT(0, handle_count_);
DCHECK_NE(static_cast<PrerenderContents*>(NULL), contents_);
if (--handle_count_ == 0) {
// This will eventually remove this object from active_prerenders_.
contents_->Destroy(FINAL_STATUS_CANCELLED);
}
}
void PrerenderManager::PrerenderData::ClearPendingSwap() {
pending_swap_.reset(NULL);
}
PrerenderContents* PrerenderManager::PrerenderData::ReleaseContents() {
return contents_.release();
}
PrerenderManager::PendingSwap::PendingSwap(
PrerenderManager* manager,
content::WebContents* target_contents,
PrerenderData* prerender_data,
const GURL& url,
bool should_replace_current_entry)
: content::WebContentsObserver(target_contents),
manager_(manager),
prerender_data_(prerender_data),
url_(url),
should_replace_current_entry_(should_replace_current_entry),
start_time_(base::TimeTicks::Now()),
seen_target_route_id_(false),
swap_successful_(false),
weak_factory_(this) {
}
PrerenderManager::PendingSwap::~PendingSwap() {
manager_->prerender_tracker()->RemovePrerenderPendingSwap(
target_route_id_, swap_successful_);
}
WebContents* PrerenderManager::PendingSwap::target_contents() const {
return web_contents();
}
void PrerenderManager::PendingSwap::BeginSwap() {
if (g_hang_session_storage_merges_for_testing)
return;
SessionStorageNamespace* target_namespace =
target_contents()->GetController().GetDefaultSessionStorageNamespace();
SessionStorageNamespace* prerender_namespace =
prerender_data_->contents()->GetSessionStorageNamespace();
prerender_namespace->Merge(
true, prerender_data_->contents()->child_id(),
target_namespace,
base::Bind(&PrerenderManager::PendingSwap::OnMergeCompleted,
weak_factory_.GetWeakPtr()));
merge_timeout_.Start(
FROM_HERE,
base::TimeDelta::FromMilliseconds(
kSessionStorageNamespaceMergeTimeoutMs),
this, &PrerenderManager::PendingSwap::OnMergeTimeout);
}
void PrerenderManager::PendingSwap::AboutToNavigateRenderView(
RenderViewHost* render_view_host) {
if (seen_target_route_id_) {
// A second navigation began browser-side.
prerender_data_->ClearPendingSwap();
return;
}
seen_target_route_id_ = true;
target_route_id_ = PrerenderTracker::ChildRouteIdPair(
render_view_host->GetMainFrame()->GetProcess()->GetID(),
render_view_host->GetMainFrame()->GetRoutingID());
manager_->prerender_tracker()->AddPrerenderPendingSwap(
target_route_id_, url_);
}
void PrerenderManager::PendingSwap::ProvisionalChangeToMainFrameUrl(
const GURL& url,
content::RenderFrameHost* render_frame_host) {
// We must only cancel the pending swap if the |url| navigated to is not
// the URL being attempted to be swapped in. That's because in the normal
// flow, a ProvisionalChangeToMainFrameUrl will happen for the URL attempted
// to be swapped in immediately after the pending swap has issued its merge.
if (url != url_)
prerender_data_->ClearPendingSwap();
}
void PrerenderManager::PendingSwap::DidCommitProvisionalLoadForFrame(
int64 frame_id,
const base::string16& frame_unique_name,
bool is_main_frame,
const GURL& validated_url,
content::PageTransition transition_type,
content::RenderViewHost* render_view_host){
if (!is_main_frame)
return;
prerender_data_->ClearPendingSwap();
}
void PrerenderManager::PendingSwap::DidFailProvisionalLoad(
int64 frame_id,
const base::string16& frame_unique_name,
bool is_main_frame,
const GURL& validated_url,
int error_code,
const base::string16& error_description,
content::RenderViewHost* render_view_host) {
if (!is_main_frame)
return;
prerender_data_->ClearPendingSwap();
}
void PrerenderManager::PendingSwap::WebContentsDestroyed() {
prerender_data_->ClearPendingSwap();
}
void PrerenderManager::PendingSwap::RecordEvent(PrerenderEvent event) const {
manager_->RecordEvent(prerender_data_->contents(), event);
}
void PrerenderManager::PendingSwap::OnMergeCompleted(
SessionStorageNamespace::MergeResult result) {
UMA_HISTOGRAM_TIMES("Prerender.SessionStorageNamespaceMergeTime",
base::TimeTicks::Now() - start_time_);
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_MERGE_DONE);
// Log the exact merge result in a histogram.
switch (result) {
case SessionStorageNamespace::MERGE_RESULT_NAMESPACE_NOT_FOUND:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_NAMESPACE_NOT_FOUND);
break;
case SessionStorageNamespace::MERGE_RESULT_NAMESPACE_NOT_ALIAS:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_NAMESPACE_NOT_ALIAS);
break;
case SessionStorageNamespace::MERGE_RESULT_NOT_LOGGING:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_NOT_LOGGING);
break;
case SessionStorageNamespace::MERGE_RESULT_NO_TRANSACTIONS:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_NO_TRANSACTIONS);
break;
case SessionStorageNamespace::MERGE_RESULT_TOO_MANY_TRANSACTIONS:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_TOO_MANY_TRANSACTIONS);
break;
case SessionStorageNamespace::MERGE_RESULT_NOT_MERGEABLE:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_NOT_MERGEABLE);
break;
case SessionStorageNamespace::MERGE_RESULT_MERGEABLE:
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_RESULT_MERGEABLE);
break;
default:
NOTREACHED();
}
if (result != SessionStorageNamespace::MERGE_RESULT_MERGEABLE &&
result != SessionStorageNamespace::MERGE_RESULT_NO_TRANSACTIONS) {
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_MERGE_FAILED);
prerender_data_->ClearPendingSwap();
return;
}
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_SWAPPING_IN);
// Note that SwapInternal will, on success, delete |prerender_data_| and
// |this|. It will also delete |this| in some failure cases. Pass in a new
// GURL object rather than a reference to |url_|. Also hold on to |manager_|
// and |prerender_data_|.
//
// TODO(davidben): Can we make this less fragile?
PrerenderManager* manager = manager_;
PrerenderData* prerender_data = prerender_data_;
WebContents* new_web_contents = manager_->SwapInternal(
GURL(url_), target_contents(), prerender_data_,
should_replace_current_entry_);
if (!new_web_contents) {
manager->RecordEvent(prerender_data->contents(),
PRERENDER_EVENT_MERGE_RESULT_SWAPIN_FAILED);
// Depending on whether SwapInternal called Destroy() or simply failed to
// swap, |this| may or may not be deleted. Either way, if the swap failed,
// |prerender_data| is deleted asynchronously, so this call is a no-op if
// |this| is already gone.
prerender_data->ClearPendingSwap();
}
}
void PrerenderManager::PendingSwap::OnMergeTimeout() {
RecordEvent(PRERENDER_EVENT_MERGE_RESULT_TIMED_OUT);
prerender_data_->ClearPendingSwap();
}
void PrerenderManager::SetPrerenderContentsFactory(
PrerenderContents::Factory* prerender_contents_factory) {
DCHECK(CalledOnValidThread());
prerender_contents_factory_.reset(prerender_contents_factory);
}
void PrerenderManager::SourceNavigatedAway(PrerenderData* prerender_data) {
// The expiry time of our prerender data will likely change because of
// this navigation. This requires a resort of active_prerenders_.
ScopedVector<PrerenderData>::iterator it =
std::find(active_prerenders_.begin(), active_prerenders_.end(),
prerender_data);
if (it == active_prerenders_.end())
return;
(*it)->set_expiry_time(
std::min((*it)->expiry_time(),
GetExpiryTimeForNavigatedAwayPrerender()));
SortActivePrerenders();
}
net::URLRequestContextGetter* PrerenderManager::GetURLRequestContext() {
return content::BrowserContext::GetDefaultStoragePartition(profile_)->
GetURLRequestContext();
}
// private
PrerenderHandle* PrerenderManager::AddPrerender(
Origin origin,
int process_id,
const GURL& url_arg,
const content::Referrer& referrer,
const gfx::Size& size,
SessionStorageNamespace* session_storage_namespace) {
DCHECK(CalledOnValidThread());
if (!IsEnabled())
return NULL;
if ((origin == ORIGIN_LINK_REL_PRERENDER_CROSSDOMAIN ||
origin == ORIGIN_LINK_REL_PRERENDER_SAMEDOMAIN) &&
IsGoogleSearchResultURL(referrer.url)) {
origin = ORIGIN_GWS_PRERENDER;
}
GURL url = url_arg;
GURL alias_url;
uint8 experiment = GetQueryStringBasedExperiment(url_arg);
if (IsControlGroup(experiment) &&
MaybeGetQueryStringBasedAliasURL(url, &alias_url)) {
url = alias_url;
}
// From here on, we will record a FinalStatus so we need to register with the
// histogram tracking.
histograms_->RecordPrerender(origin, url_arg);
if (PrerenderData* preexisting_prerender_data =
FindPrerenderData(url, session_storage_namespace)) {
RecordFinalStatusWithoutCreatingPrerenderContents(
url, origin, experiment, FINAL_STATUS_DUPLICATE);
return new PrerenderHandle(preexisting_prerender_data);
}
// Do not prerender if there are too many render processes, and we would
// have to use an existing one. We do not want prerendering to happen in
// a shared process, so that we can always reliably lower the CPU
// priority for prerendering.
// In single-process mode, ShouldTryToUseExistingProcessHost() always returns
// true, so that case needs to be explicitly checked for.
// TODO(tburkard): Figure out how to cancel prerendering in the opposite
// case, when a new tab is added to a process used for prerendering.
// TODO(ppi): Check whether there are usually enough render processes
// available on Android. If not, kill an existing renderers so that we can
// create a new one.
if (content::RenderProcessHost::ShouldTryToUseExistingProcessHost(
profile_, url) &&
!content::RenderProcessHost::run_renderer_in_process()) {
RecordFinalStatusWithoutCreatingPrerenderContents(
url, origin, experiment, FINAL_STATUS_TOO_MANY_PROCESSES);
return NULL;
}
// Check if enough time has passed since the last prerender.
if (!DoesRateLimitAllowPrerender(origin)) {
// Cancel the prerender. We could add it to the pending prerender list but
// this doesn't make sense as the next prerender request will be triggered
// by a navigation and is unlikely to be the same site.
RecordFinalStatusWithoutCreatingPrerenderContents(
url, origin, experiment, FINAL_STATUS_RATE_LIMIT_EXCEEDED);
return NULL;
}
if (IsPrerenderCookieStoreEnabled() && !cookie_store_loaded()) {
// Only prerender if the cookie store for this profile has been loaded.
// This is required by PrerenderCookieMonster.
RecordFinalStatusWithoutCreatingPrerenderContents(
url, origin, experiment, FINAL_STATUS_COOKIE_STORE_NOT_LOADED);
return NULL;
}
PrerenderContents* prerender_contents = CreatePrerenderContents(
url, referrer, origin, experiment);
DCHECK(prerender_contents);
active_prerenders_.push_back(
new PrerenderData(this, prerender_contents,
GetExpiryTimeForNewPrerender(origin)));
if (!prerender_contents->Init()) {
DCHECK(active_prerenders_.end() ==
FindIteratorForPrerenderContents(prerender_contents));
return NULL;
}
histograms_->RecordPrerenderStarted(origin);
DCHECK(!prerender_contents->prerendering_has_started());
PrerenderHandle* prerender_handle =
new PrerenderHandle(active_prerenders_.back());
SortActivePrerenders();
last_prerender_start_time_ = GetCurrentTimeTicks();
gfx::Size contents_size =
size.IsEmpty() ? config_.default_tab_bounds.size() : size;
net::URLRequestContextGetter* request_context =
(IsPrerenderCookieStoreEnabled() ? GetURLRequestContext() : NULL);
prerender_contents->StartPrerendering(process_id, contents_size,
session_storage_namespace,
request_context);
DCHECK(IsControlGroup(experiment) ||
prerender_contents->prerendering_has_started() ||
(origin == ORIGIN_LOCAL_PREDICTOR &&
IsLocalPredictorPrerenderAlwaysControlEnabled()));
if (GetMode() == PRERENDER_MODE_EXPERIMENT_MULTI_PRERENDER_GROUP)
histograms_->RecordConcurrency(active_prerenders_.size());
// Query the history to see if the URL being prerendered has ever been
// visited before.
HistoryService* history_service = HistoryServiceFactory::GetForProfile(
profile_, Profile::EXPLICIT_ACCESS);
if (history_service) {
history_service->QueryURL(
url,
false,
base::Bind(&PrerenderManager::OnHistoryServiceDidQueryURL,
base::Unretained(this),
origin,
experiment),
&query_url_tracker_);
}
StartSchedulingPeriodicCleanups();
return prerender_handle;
}
void PrerenderManager::StartSchedulingPeriodicCleanups() {
DCHECK(CalledOnValidThread());
if (repeating_timer_.IsRunning())
return;
repeating_timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(kPeriodicCleanupIntervalMs),
this,
&PrerenderManager::PeriodicCleanup);
}
void PrerenderManager::StopSchedulingPeriodicCleanups() {
DCHECK(CalledOnValidThread());
repeating_timer_.Stop();
}
void PrerenderManager::PeriodicCleanup() {
DCHECK(CalledOnValidThread());
base::ElapsedTimer resource_timer;
// Grab a copy of the current PrerenderContents pointers, so that we
// will not interfere with potential deletions of the list.
std::vector<PrerenderContents*>
prerender_contents(active_prerenders_.size());
std::transform(active_prerenders_.begin(), active_prerenders_.end(),
prerender_contents.begin(),
std::mem_fun(&PrerenderData::contents));
// And now check for prerenders using too much memory.
std::for_each(prerender_contents.begin(), prerender_contents.end(),
std::mem_fun(
&PrerenderContents::DestroyWhenUsingTooManyResources));
// Measure how long the resource checks took. http://crbug.com/305419.
UMA_HISTOGRAM_TIMES("Prerender.PeriodicCleanupResourceCheckTime",
resource_timer.Elapsed());
base::ElapsedTimer cleanup_timer;
// Perform deferred cleanup work.
DeleteOldWebContents();
DeleteOldEntries();
if (active_prerenders_.empty())
StopSchedulingPeriodicCleanups();
to_delete_prerenders_.clear();
// Measure how long a the various cleanup tasks took. http://crbug.com/305419.
UMA_HISTOGRAM_TIMES("Prerender.PeriodicCleanupDeleteContentsTime",
cleanup_timer.Elapsed());
}
void PrerenderManager::PostCleanupTask() {
DCHECK(CalledOnValidThread());
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&PrerenderManager::PeriodicCleanup, AsWeakPtr()));
}
base::TimeTicks PrerenderManager::GetExpiryTimeForNewPrerender(
Origin origin) const {
base::TimeDelta ttl = config_.time_to_live;
if (origin == ORIGIN_LOCAL_PREDICTOR)
ttl = base::TimeDelta::FromSeconds(GetLocalPredictorTTLSeconds());
return GetCurrentTimeTicks() + ttl;
}
base::TimeTicks PrerenderManager::GetExpiryTimeForNavigatedAwayPrerender()
const {
return GetCurrentTimeTicks() + config_.abandon_time_to_live;
}
void PrerenderManager::DeleteOldEntries() {
DCHECK(CalledOnValidThread());
while (!active_prerenders_.empty()) {
PrerenderData* prerender_data = active_prerenders_.front();
DCHECK(prerender_data);
DCHECK(prerender_data->contents());
if (prerender_data->expiry_time() > GetCurrentTimeTicks())
return;
prerender_data->contents()->Destroy(FINAL_STATUS_TIMED_OUT);
}
}
base::Time PrerenderManager::GetCurrentTime() const {
return base::Time::Now();
}
base::TimeTicks PrerenderManager::GetCurrentTimeTicks() const {
return base::TimeTicks::Now();
}
PrerenderContents* PrerenderManager::CreatePrerenderContents(
const GURL& url,
const content::Referrer& referrer,
Origin origin,
uint8 experiment_id) {
DCHECK(CalledOnValidThread());
return prerender_contents_factory_->CreatePrerenderContents(
this, profile_, url, referrer, origin, experiment_id);
}
void PrerenderManager::SortActivePrerenders() {
std::sort(active_prerenders_.begin(), active_prerenders_.end(),
PrerenderData::OrderByExpiryTime());
}
PrerenderManager::PrerenderData* PrerenderManager::FindPrerenderData(
const GURL& url,
const SessionStorageNamespace* session_storage_namespace) {
for (ScopedVector<PrerenderData>::iterator it = active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
if ((*it)->contents()->Matches(url, session_storage_namespace))
return *it;
}
return NULL;
}
PrerenderManager::PrerenderData*
PrerenderManager::FindPrerenderDataForTargetContents(
WebContents* target_contents) {
for (ScopedVector<PrerenderData>::iterator it = active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
if ((*it)->pending_swap() &&
(*it)->pending_swap()->target_contents() == target_contents)
return *it;
}
return NULL;
}
ScopedVector<PrerenderManager::PrerenderData>::iterator
PrerenderManager::FindIteratorForPrerenderContents(
PrerenderContents* prerender_contents) {
for (ScopedVector<PrerenderData>::iterator it = active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
if (prerender_contents == (*it)->contents())
return it;
}
return active_prerenders_.end();
}
bool PrerenderManager::DoesRateLimitAllowPrerender(Origin origin) const {
DCHECK(CalledOnValidThread());
base::TimeDelta elapsed_time =
GetCurrentTimeTicks() - last_prerender_start_time_;
histograms_->RecordTimeBetweenPrerenderRequests(origin, elapsed_time);
if (!config_.rate_limit_enabled)
return true;
// The LocalPredictor may issue multiple prerenders simultaneously (if so
// configured), so no throttling.
if (origin == ORIGIN_LOCAL_PREDICTOR)
return true;
return elapsed_time >=
base::TimeDelta::FromMilliseconds(kMinTimeBetweenPrerendersMs);
}
void PrerenderManager::DeleteOldWebContents() {
while (!old_web_contents_list_.empty()) {
WebContents* web_contents = old_web_contents_list_.front();
old_web_contents_list_.pop_front();
// TODO(dominich): should we use Instant Unload Handler here?
delete web_contents;
}
}
void PrerenderManager::CleanUpOldNavigations() {
DCHECK(CalledOnValidThread());
// Cutoff. Navigations before this cutoff can be discarded.
base::TimeTicks cutoff = GetCurrentTimeTicks() -
base::TimeDelta::FromMilliseconds(kNavigationRecordWindowMs);
while (!navigations_.empty()) {
if (navigations_.front().time > cutoff)
break;
navigations_.pop_front();
}
}
void PrerenderManager::ScheduleDeleteOldWebContents(
WebContents* tab,
OnCloseWebContentsDeleter* deleter) {
old_web_contents_list_.push_back(tab);
PostCleanupTask();
if (deleter) {
ScopedVector<OnCloseWebContentsDeleter>::iterator i = std::find(
on_close_web_contents_deleters_.begin(),
on_close_web_contents_deleters_.end(),
deleter);
DCHECK(i != on_close_web_contents_deleters_.end());
on_close_web_contents_deleters_.erase(i);
}
}
void PrerenderManager::AddToHistory(PrerenderContents* contents) {
PrerenderHistory::Entry entry(contents->prerender_url(),
contents->final_status(),
contents->origin(),
base::Time::Now());
prerender_history_->AddEntry(entry);
}
base::Value* PrerenderManager::GetActivePrerendersAsValue() const {
base::ListValue* list_value = new base::ListValue();
for (ScopedVector<PrerenderData>::const_iterator it =
active_prerenders_.begin();
it != active_prerenders_.end(); ++it) {
if (base::Value* prerender_value = (*it)->contents()->GetAsValue())
list_value->Append(prerender_value);
}
return list_value;
}
void PrerenderManager::DestroyAllContents(FinalStatus final_status) {
DeleteOldWebContents();
while (!active_prerenders_.empty()) {
PrerenderContents* contents = active_prerenders_.front()->contents();
contents->Destroy(final_status);
}
to_delete_prerenders_.clear();
}
void PrerenderManager::DestroyAndMarkMatchCompleteAsUsed(
PrerenderContents* prerender_contents,
FinalStatus final_status) {
prerender_contents->set_match_complete_status(
PrerenderContents::MATCH_COMPLETE_REPLACED);
histograms_->RecordFinalStatus(prerender_contents->origin(),
prerender_contents->experiment_id(),
PrerenderContents::MATCH_COMPLETE_REPLACEMENT,
FINAL_STATUS_WOULD_HAVE_BEEN_USED);
prerender_contents->Destroy(final_status);
}
void PrerenderManager::RecordFinalStatusWithoutCreatingPrerenderContents(
const GURL& url, Origin origin, uint8 experiment_id,
FinalStatus final_status) const {
PrerenderHistory::Entry entry(url, final_status, origin, base::Time::Now());
prerender_history_->AddEntry(entry);
RecordFinalStatusWithMatchCompleteStatus(
origin, experiment_id,
PrerenderContents::MATCH_COMPLETE_DEFAULT,
final_status);
}
void PrerenderManager::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_COOKIE_CHANGED: {
Profile* profile = content::Source<Profile>(source).ptr();
if (!profile || !profile_->IsSameProfile(profile) ||
profile->IsOffTheRecord()) {
return;
}
CookieChanged(content::Details<ChromeCookieDetails>(details).ptr());
break;
}
case chrome::NOTIFICATION_PROFILE_DESTROYED:
DestroyAllContents(FINAL_STATUS_PROFILE_DESTROYED);
on_close_web_contents_deleters_.clear();
break;
default:
NOTREACHED() << "Unexpected notification sent.";
break;
}
}
void PrerenderManager::OnCreatingAudioStream(int render_process_id,
int render_frame_id) {
content::RenderFrameHost* render_frame_host =
content::RenderFrameHost::FromID(render_process_id, render_frame_id);
WebContents* tab = WebContents::FromRenderFrameHost(render_frame_host);
if (!tab)
return;
PrerenderContents* prerender_contents = GetPrerenderContents(tab);
if (!prerender_contents)
return;
prerender_contents->Destroy(prerender::FINAL_STATUS_CREATING_AUDIO_STREAM);
}
void PrerenderManager::RecordLikelyLoginOnURL(const GURL& url) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!url.SchemeIsHTTPOrHTTPS())
return;
if (logged_in_predictor_table_.get()) {
BrowserThread::PostTask(
BrowserThread::DB,
FROM_HERE,
base::Bind(&LoggedInPredictorTable::AddDomainFromURL,
logged_in_predictor_table_,
url));
}
std::string key = LoggedInPredictorTable::GetKey(url);
if (!logged_in_state_.get())
return;
if (logged_in_state_->count(key))
return;
(*logged_in_state_)[key] = base::Time::Now().ToInternalValue();
}
void PrerenderManager::CheckIfLikelyLoggedInOnURL(
const GURL& url,
bool* lookup_result,
bool* database_was_present,
const base::Closure& result_cb) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!logged_in_predictor_table_.get()) {
*database_was_present = false;
*lookup_result = false;
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, result_cb);
return;
}
BrowserThread::PostTaskAndReply(
BrowserThread::DB, FROM_HERE,
base::Bind(&LoggedInPredictorTable::HasUserLoggedIn,
logged_in_predictor_table_,
url,
lookup_result,
database_was_present),
result_cb);
}
void PrerenderManager::CookieChanged(ChromeCookieDetails* details) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!logged_in_predictor_table_.get())
return;
// We only care when a cookie has been removed.
if (!details->removed)
return;
std::string domain_key =
LoggedInPredictorTable::GetKeyFromDomain(details->cookie->Domain());
// If we have no record of this domain as a potentially logged in domain,
// nothing to do here.
if (logged_in_state_.get() && logged_in_state_->count(domain_key) < 1)
return;
net::URLRequestContextGetter* rq_context = profile_->GetRequestContext();
if (!rq_context)
return;
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&CheckIfCookiesExistForDomainOnIOThread,
base::Unretained(rq_context),
domain_key,
base::Bind(
&PrerenderManager::CookieChangedAnyCookiesLeftLookupResult,
AsWeakPtr(),
domain_key)
));
}
void PrerenderManager::CookieChangedAnyCookiesLeftLookupResult(
const std::string& domain_key,
bool cookies_exist) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (cookies_exist)
return;
if (logged_in_predictor_table_.get()) {
BrowserThread::PostTask(BrowserThread::DB,
FROM_HERE,
base::Bind(&LoggedInPredictorTable::DeleteDomain,
logged_in_predictor_table_,
domain_key));
}
if (logged_in_state_.get())
logged_in_state_->erase(domain_key);
}
void PrerenderManager::LoggedInPredictorDataReceived(
scoped_ptr<LoggedInStateMap> new_map) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
logged_in_state_.swap(new_map);
}
void PrerenderManager::RecordEvent(PrerenderContents* contents,
PrerenderEvent event) const {
if (!contents)
histograms_->RecordEvent(ORIGIN_NONE, kNoExperiment, event);
else
histograms_->RecordEvent(contents->origin(), contents->experiment_id(),
event);
}
// static
void PrerenderManager::RecordCookieEvent(int process_id,
int frame_id,
const GURL& url,
const GURL& frame_url,
bool is_for_blocking_resource,
PrerenderContents::CookieEvent event,
const net::CookieList* cookie_list) {
RenderFrameHost* rfh = RenderFrameHost::FromID(process_id, frame_id);
WebContents* web_contents = WebContents::FromRenderFrameHost(rfh);
if (!web_contents)
return;
bool is_main_frame = (rfh == web_contents->GetMainFrame());
bool is_third_party_cookie =
(!frame_url.is_empty() &&
!net::registry_controlled_domains::SameDomainOrHost(
url, frame_url,
net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES));
PrerenderContents* prerender_contents =
PrerenderContents::FromWebContents(web_contents);
if (!prerender_contents)
return;
base::Time earliest_create_date;
if (event == PrerenderContents::COOKIE_EVENT_SEND) {
if (!cookie_list || cookie_list->empty())
return;
for (size_t i = 0; i < cookie_list->size(); i++) {
if (earliest_create_date.is_null() ||
(*cookie_list)[i].CreationDate() < earliest_create_date) {
earliest_create_date = (*cookie_list)[i].CreationDate();
}
}
}
prerender_contents->RecordCookieEvent(event,
is_main_frame && url == frame_url,
is_third_party_cookie,
is_for_blocking_resource,
earliest_create_date);
}
void PrerenderManager::RecordCookieStatus(Origin origin,
uint8 experiment_id,
int cookie_status) const {
histograms_->RecordCookieStatus(origin, experiment_id, cookie_status);
}
void PrerenderManager::RecordCookieSendType(Origin origin,
uint8 experiment_id,
int cookie_send_type) const {
histograms_->RecordCookieSendType(origin, experiment_id, cookie_send_type);
}
void PrerenderManager::OnHistoryServiceDidQueryURL(
Origin origin,
uint8 experiment_id,
bool success,
const history::URLRow& url_row,
const history::VisitVector& /*visits*/) {
histograms_->RecordPrerenderPageVisitedStatus(origin, experiment_id, success);
}
// static
void PrerenderManager::HangSessionStorageMergesForTesting() {
g_hang_session_storage_merges_for_testing = true;
}
void PrerenderManager::RecordNetworkBytes(Origin origin,
bool used,
int64 prerender_bytes) {
if (!ActuallyPrerendering())
return;
int64 recent_profile_bytes =
profile_network_bytes_ - last_recorded_profile_network_bytes_;
last_recorded_profile_network_bytes_ = profile_network_bytes_;
DCHECK_GE(recent_profile_bytes, 0);
histograms_->RecordNetworkBytes(
origin, used, prerender_bytes, recent_profile_bytes);
}
bool PrerenderManager::IsEnabled() const {
DCHECK(CalledOnValidThread());
if (!enabled_)
return false;
for (std::list<const PrerenderCondition*>::const_iterator it =
prerender_conditions_.begin();
it != prerender_conditions_.end();
++it) {
const PrerenderCondition* condition = *it;
if (!condition->CanPrerender())
return false;
}
return true;
}
void PrerenderManager::AddProfileNetworkBytesIfEnabled(int64 bytes) {
DCHECK_GE(bytes, 0);
if (IsEnabled() && ActuallyPrerendering())
profile_network_bytes_ += bytes;
}
void PrerenderManager::OnCookieStoreLoaded() {
cookie_store_loaded_ = true;
if (!on_cookie_store_loaded_cb_for_testing_.is_null())
on_cookie_store_loaded_cb_for_testing_.Run();
}
void PrerenderManager::AddPrerenderProcessHost(
content::RenderProcessHost* process_host) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(prerender_process_hosts_.find(process_host) ==
prerender_process_hosts_.end());
prerender_process_hosts_.insert(process_host);
process_host->AddObserver(this);
}
bool PrerenderManager::MayReuseProcessHost(
content::RenderProcessHost* process_host) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// If prerender cookie stores are disabled, there is no need to require
// isolated prerender processes.
if (!IsPrerenderCookieStoreEnabled())
return true;
return (prerender_process_hosts_.find(process_host) ==
prerender_process_hosts_.end());
}
void PrerenderManager::RenderProcessHostDestroyed(
content::RenderProcessHost* host) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
prerender_process_hosts_.erase(host);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&PrerenderTracker::RemovePrerenderCookieStoreOnIOThread,
base::Unretained(prerender_tracker()), host->GetID(), false));
}
} // namespace prerender