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// Copyright 2018 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 "third_party/blink/renderer/core/loader/previews_resource_loading_hints.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
namespace {
String GetConsoleLogStringForBlockedLoad(const KURL& url) {
return "[Intervention] Non-critical resource " + url.GetString() +
" is blocked due to page load being slow. Learn more at "
"https://www.chromestatus.com/feature/4510564810227712.";
}
} // namespace
// static
PreviewsResourceLoadingHints* PreviewsResourceLoadingHints::Create(
ExecutionContext& execution_context,
int64_t ukm_source_id,
const WebVector<WebString>& subresource_patterns_to_block) {
return MakeGarbageCollected<PreviewsResourceLoadingHints>(
&execution_context, ukm_source_id, subresource_patterns_to_block);
}
// static
PreviewsResourceLoadingHints*
PreviewsResourceLoadingHints::CreateFromLoadingHintsProvider(
ExecutionContext& execution_context,
std::unique_ptr<WebLoadingHintsProvider> loading_hints_provider) {
WebVector<WebString> subresource_patterns_to_block;
for (const auto& pattern :
loading_hints_provider->subresource_patterns_to_block) {
// |pattern| is guaranteed to be ascii.
subresource_patterns_to_block.emplace_back(pattern);
}
return MakeGarbageCollected<PreviewsResourceLoadingHints>(
&execution_context, loading_hints_provider->ukm_source_id,
subresource_patterns_to_block);
}
PreviewsResourceLoadingHints::PreviewsResourceLoadingHints(
ExecutionContext* execution_context,
int64_t ukm_source_id,
const WebVector<WebString>& subresource_patterns_to_block)
: execution_context_(execution_context),
ukm_source_id_(ukm_source_id),
subresource_patterns_to_block_(subresource_patterns_to_block) {
DCHECK_NE(ukm::kInvalidSourceId, ukm_source_id_);
subresource_patterns_to_block_usage_.Fill(
false,
static_cast<WTF::wtf_size_t>(subresource_patterns_to_block.size()));
blocked_resource_load_priority_counts_.Fill(
0, static_cast<int>(ResourceLoadPriority::kHighest) + 1);
// Populate which specific resource types are eligible for blocking.
// Certain resource types are blocked by default since their blocking
// is currently verified by the server verification pipeline. Note that
// the blocking of these resource types can be overridden using field trial.
block_resource_type_[static_cast<int>(ResourceType::kCSSStyleSheet)] = true;
block_resource_type_[static_cast<int>(ResourceType::kScript)] = true;
block_resource_type_[static_cast<int>(ResourceType::kRaw)] = true;
for (int i = 0; i < static_cast<int>(ResourceType::kMaxValue) + 1; ++i) {
// Parameter names are of format: "block_resource_type_%d". The value
// should be either "true" or "false".
block_resource_type_[i] = base::GetFieldTrialParamByFeatureAsBool(
features::kPreviewsResourceLoadingHintsSpecificResourceTypes,
String::Format("block_resource_type_%d", i).Ascii(),
block_resource_type_[i]);
}
// Ensure that the ResourceType enums have not changed. These should not be
// changed since the resource type integer values are used as field trial
// params.
static_assert(static_cast<int>(ResourceType::kImage) == 1 &&
static_cast<int>(ResourceType::kCSSStyleSheet) == 2 &&
static_cast<int>(ResourceType::kScript) == 3,
"ResourceType enums can't be changed");
}
PreviewsResourceLoadingHints::~PreviewsResourceLoadingHints() = default;
bool PreviewsResourceLoadingHints::AllowLoad(
ResourceType type,
const KURL& resource_url,
ResourceLoadPriority resource_load_priority) const {
if (!resource_url.ProtocolIsInHTTPFamily())
return true;
if (!block_resource_type_[static_cast<int>(type)])
return true;
WTF::String resource_url_string = resource_url.GetString();
resource_url_string = resource_url_string.Left(resource_url.PathEnd());
bool allow_load = true;
int pattern_index = 0;
for (const WTF::String& subresource_pattern :
subresource_patterns_to_block_) {
// TODO(tbansal): https://crbug.com/856247. Add support for wildcard
// matching.
if (resource_url_string.Find(subresource_pattern) != kNotFound) {
allow_load = false;
subresource_patterns_to_block_usage_[pattern_index] = true;
blocked_resource_load_priority_counts_[static_cast<int>(
resource_load_priority)]++;
break;
}
pattern_index++;
}
UMA_HISTOGRAM_BOOLEAN("ResourceLoadingHints.ResourceLoadingBlocked",
!allow_load);
if (!allow_load) {
ReportBlockedLoading(resource_url);
UMA_HISTOGRAM_ENUMERATION(
"ResourceLoadingHints.ResourceLoadingBlocked.ResourceLoadPriority."
"Blocked",
resource_load_priority,
static_cast<int>(ResourceLoadPriority::kHighest) + 1);
} else {
UMA_HISTOGRAM_ENUMERATION(
"ResourceLoadingHints.ResourceLoadingBlocked.ResourceLoadPriority."
"Allowed",
resource_load_priority,
static_cast<int>(ResourceLoadPriority::kHighest) + 1);
}
return allow_load;
}
void PreviewsResourceLoadingHints::ReportBlockedLoading(
const KURL& resource_url) const {
execution_context_->AddConsoleMessage(ConsoleMessage::Create(
mojom::ConsoleMessageSource::kOther, mojom::ConsoleMessageLevel::kWarning,
GetConsoleLogStringForBlockedLoad(resource_url)));
}
void PreviewsResourceLoadingHints::Trace(blink::Visitor* visitor) {
visitor->Trace(execution_context_);
}
void PreviewsResourceLoadingHints::RecordUKM(
ukm::UkmRecorder* ukm_recorder) const {
DCHECK(ukm_recorder);
size_t patterns_to_block_used_count = 0;
for (bool pattern_used : subresource_patterns_to_block_usage_) {
if (pattern_used) {
patterns_to_block_used_count++;
}
}
ukm::builders::PreviewsResourceLoadingHints(ukm_source_id_)
.Setpatterns_to_block_total(subresource_patterns_to_block_.size())
.Setpatterns_to_block_used(patterns_to_block_used_count)
.Setblocked_very_low_priority(
blocked_resource_load_priority_counts_[static_cast<int>(
ResourceLoadPriority::kVeryLow)])
.Setblocked_low_priority(
blocked_resource_load_priority_counts_[static_cast<int>(
ResourceLoadPriority::kLow)])
.Setblocked_medium_priority(
blocked_resource_load_priority_counts_[static_cast<int>(
ResourceLoadPriority::kMedium)])
.Setblocked_high_priority(
blocked_resource_load_priority_counts_[static_cast<int>(
ResourceLoadPriority::kHigh)])
.Setblocked_very_high_priority(
blocked_resource_load_priority_counts_[static_cast<int>(
ResourceLoadPriority::kVeryHigh)])
.Record(ukm_recorder);
}
} // namespace blink
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