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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 "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.
constexpr base::TimeDelta kDefaultCancellationTimeout = base::Seconds(11);
base::TimeDelta g_cancellation_timeout = kDefaultCancellationTimeout;
} // namespace
// static
std::unique_ptr<RendererCancellationThrottle>
RendererCancellationThrottle::MaybeCreateThrottleFor(NavigationHandle* handle) {
NavigationRequest* request = NavigationRequest::From(handle);
if (request->ShouldWaitForRendererCancellationWindowToEnd()) {
return std::make_unique<RendererCancellationThrottle>(handle);
}
return nullptr;
}
// static
void RendererCancellationThrottle::SetCancellationTimeoutForTesting(
base::TimeDelta timeout) {
if (timeout.is_zero()) {
g_cancellation_timeout = kDefaultCancellationTimeout;
} else {
g_cancellation_timeout = timeout;
}
}
RendererCancellationThrottle::RendererCancellationThrottle(
NavigationHandle* navigation_handle)
: NavigationThrottle(navigation_handle) {}
RendererCancellationThrottle::~RendererCancellationThrottle() = default;
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.
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() {
CHECK(NavigationRequest::From(navigation_handle())
->renderer_cancellation_window_ended());
// Stop the timeout and notify that renderer is responsive if necessary.
renderer_cancellation_timeout_timer_.Stop();
NavigationRequest* request = NavigationRequest::From(navigation_handle());
request->GetRenderFrameHost()->GetRenderWidgetHost()->RendererIsResponsive();
Resume();
}
void RendererCancellationThrottle::OnTimeout() {
// 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, g_cancellation_timeout,
base::BindOnce(&RendererCancellationThrottle::OnTimeout,
base::Unretained(this)));
}
const char* RendererCancellationThrottle::GetNameForLogging() {
return "RendererCancellationThrottle";
}
} // namespace content
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