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// Copyright 2024 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/preloading/prerender/prerender_url_loader_throttle.h"
#include "content/browser/preloading/prerender/prerender_features.h"
#include "content/browser/preloading/prerender/prerender_final_status.h"
#include "content/browser/preloading/prerender/prerender_host.h"
#include "content/browser/preloading/prerender/prerender_host_registry.h"
#include "content/browser/preloading/prerender/prerender_metrics.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/render_frame_host_delegate.h"
namespace content {
PrerenderURLLoaderThrottle::PrerenderURLLoaderThrottle(
FrameTreeNodeId frame_tree_node_id)
: frame_tree_node_id_(frame_tree_node_id) {}
// static
std::unique_ptr<PrerenderURLLoaderThrottle>
PrerenderURLLoaderThrottle::MaybeCreate(FrameTreeNodeId frame_tree_node_id) {
if (!features::UsePrefetchPrerenderIntegration()) {
return nullptr;
}
auto* frame_tree_node = FrameTreeNode::GloballyFindByID(frame_tree_node_id);
if (!frame_tree_node) {
return nullptr;
}
PrerenderHostRegistry* prerender_host_registry =
frame_tree_node->current_frame_host()
->delegate()
->GetPrerenderHostRegistry();
if (!prerender_host_registry) {
return nullptr;
}
PrerenderHost* prerender_host =
prerender_host_registry->FindNonReservedHostById(frame_tree_node_id);
if (!prerender_host) {
return nullptr;
}
if (!prerender_host->ShouldAbortNavigationBecausePrefetchUnavailable()) {
return nullptr;
}
// If the prefetch ahead of prerender "failed", `PrerenderURLLoaderThrottle`
// is added to the `ThrottlingURLLoader` for the corresponding prerendering
// navigation, and the `PrerenderURLLoaderThrottle` always cancels the network
// request before it starts, which cancels the prerender.
return std::make_unique<PrerenderURLLoaderThrottle>(frame_tree_node_id);
}
void PrerenderURLLoaderThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
delegate_->CancelWithError(net::ERR_ABORTED);
auto* frame_tree_node = FrameTreeNode::GloballyFindByID(frame_tree_node_id_);
if (!frame_tree_node) {
return;
}
PrerenderHostRegistry* prerender_host_registry =
frame_tree_node->current_frame_host()
->delegate()
->GetPrerenderHostRegistry();
if (!prerender_host_registry) {
return;
}
prerender_host_registry->CancelHost(
frame_tree_node_id_,
PrerenderCancellationReason(
PrerenderFinalStatus::kPrerenderFailedDuringPrefetch));
}
} // namespace content
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