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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/renderer_cancellation_throttle.h"
#include "base/metrics/histogram_functions.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
namespace content {
namespace {
// Default timeout for the cancellation window. From gathering data through the
// "Navigation.RendererInitiatedCancellation.DeferStartToCancellationWindowEnd"
// UMA, 99% of navigations' cancellation window ends in under 2000ms, and all
// cancellation windows end in under 10000ms, so setting this to 11000ms.
const base::FeatureParam<base::TimeDelta> throttle_timeout{
&features::kRendererCancellationThrottleImprovements, "timeout",
base::Milliseconds(11000)};
} // namespace
// static
void RendererCancellationThrottle::MaybeCreateAndAdd(
NavigationThrottleRegistry& registry) {
NavigationRequest* request =
NavigationRequest::From(®istry.GetNavigationHandle());
if (request->ShouldWaitForRendererCancellationWindowToEnd()) {
registry.AddThrottle(
std::make_unique<RendererCancellationThrottle>(registry));
}
}
RendererCancellationThrottle::RendererCancellationThrottle(
NavigationThrottleRegistry& registry)
: NavigationThrottle(registry) {}
RendererCancellationThrottle::~RendererCancellationThrottle() {
if (defer_start_time_ == base::TimeTicks()) {
return;
}
base::UmaHistogramBoolean(
"Navigation.RendererCancellationThrottle.NavigationCancelled",
!did_resume_navigation_);
if (!did_resume_navigation_) {
base::UmaHistogramTimes(
"Navigation.RendererCancellationThrottle.NavigationCancelled."
"TimeUntilCancel",
base::TimeTicks::Now() - defer_start_time_);
}
}
NavigationThrottle::ThrottleCheckResult
RendererCancellationThrottle::WillProcessResponse() {
return WaitForRendererCancellationIfNeeded();
}
NavigationThrottle::ThrottleCheckResult
RendererCancellationThrottle::WillCommitWithoutUrlLoader() {
return WaitForRendererCancellationIfNeeded();
}
NavigationThrottle::ThrottleCheckResult
RendererCancellationThrottle::WaitForRendererCancellationIfNeeded() {
NavigationRequest* request = NavigationRequest::From(navigation_handle());
DCHECK(request);
if (request->renderer_cancellation_window_ended()) {
// The cancellation window had already ended, so the navigation doesn't need
// deferring.
return NavigationThrottle::PROCEED;
}
if (!request->GetRenderFrameHost() ||
request->GetRenderFrameHost()->GetSiteInstance()->group() !=
request->frame_tree_node()
->current_frame_host()
->GetSiteInstance()
->group()) {
// Only defer same-SiteInstanceGroup navigations, as only those navigations
// were previously guaranteed to be cancelable from the same JS task it
// started on (see class level comment for more details).
return NavigationThrottle::PROCEED;
}
// Start the cancellation timeout, to warn users of an unresponsive renderer
// if the cancellation window is longer than the set time limit.
defer_start_time_ = base::TimeTicks::Now();
RestartTimeout();
// Wait for the navigation cancellation window to end before continuing.
request->set_renderer_cancellation_window_ended_callback(base::BindOnce(
&RendererCancellationThrottle::NavigationCancellationWindowEnded,
base::Unretained(this)));
return NavigationThrottle::DEFER;
}
void RendererCancellationThrottle::NavigationCancellationWindowEnded() {
if (did_resume_navigation_) {
// The timeout handler already resumed the navigation.
return;
}
base::UmaHistogramBoolean(
"Navigation.RendererCancellationThrottle.NotCancelled.TimeoutIsHit",
false);
base::UmaHistogramTimes(
"Navigation.RendererCancellationThrottle.TimeUntilWindowEnd",
base::TimeTicks::Now() - defer_start_time_);
NavigationRequest* request = NavigationRequest::From(navigation_handle());
CHECK(request->renderer_cancellation_window_ended());
// Stop the timeout and notify that renderer is responsive if necessary.
renderer_cancellation_timeout_timer_.Stop();
if (!base::FeatureList::IsEnabled(
features::kRendererCancellationThrottleImprovements)) {
request->GetRenderFrameHost()
->GetRenderWidgetHost()
->RendererIsResponsive();
}
did_resume_navigation_ = true;
Resume();
}
void RendererCancellationThrottle::SetOnTimeoutCallbackForTesting(
base::OnceClosure callback) {
on_timeout_callback_for_testing_ = std::move(callback);
}
void RendererCancellationThrottle::OnTimeout() {
if (on_timeout_callback_for_testing_) {
std::move(on_timeout_callback_for_testing_).Run();
}
base::UmaHistogramBoolean(
"Navigation.RendererCancellationThrottle.NotCancelled.TimeoutIsHit",
true);
if (base::FeatureList::IsEnabled(
features::kRendererCancellationThrottleImprovements)) {
// Resume the navigation once it hits the timeout, without marking the
// renderer as unresponsive.
did_resume_navigation_ = true;
Resume();
return;
}
// Warn that the renderer is unresponsive.
NavigationRequest* request = NavigationRequest::From(navigation_handle());
DCHECK(request);
auto* previous_rfh =
RenderFrameHostImpl::FromID(request->GetPreviousRenderFrameHostId());
if (!previous_rfh) {
return;
}
previous_rfh->GetRenderWidgetHost()->RendererIsUnresponsive(
RenderWidgetHostImpl::RendererIsUnresponsiveReason::
kRendererCancellationThrottleTimeout,
base::BindRepeating(&RendererCancellationThrottle::RestartTimeout,
weak_factory_.GetWeakPtr()));
}
void RendererCancellationThrottle::RestartTimeout() {
renderer_cancellation_timeout_timer_.Start(
FROM_HERE, throttle_timeout.Get(),
base::BindOnce(&RendererCancellationThrottle::OnTimeout,
base::Unretained(this)));
}
const char* RendererCancellationThrottle::GetNameForLogging() {
return "RendererCancellationThrottle";
}
} // namespace content
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