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// Copyright 2018 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/metrics/histograms_internals_ui.h"
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/metrics/histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "base/values.h"
#include "content/browser/metrics/histogram_synchronizer.h"
#include "content/browser/metrics/histograms_monitor.h"
#include "content/grit/histograms_resources.h"
#include "content/grit/histograms_resources_map.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_ui.h"
#include "content/public/browser/web_ui_data_source.h"
#include "content/public/browser/web_ui_message_handler.h"
#include "content/public/common/content_client.h"
#include "content/public/common/url_constants.h"
#include "services/network/public/mojom/content_security_policy.mojom.h"
namespace content {
namespace {
const char kHistogramsUIRequestHistograms[] = "requestHistograms";
const char kHistogramsUIStartMonitoring[] = "startMonitoring";
const char kHistogramsUIFetchDiff[] = "fetchDiff";
// Stores the information received from Javascript side.
struct JsParams {
std::string callback_id;
std::string query;
bool include_subprocesses;
};
void CreateAndAddHistogramsHTMLSource(BrowserContext* browser_context) {
WebUIDataSource* source =
WebUIDataSource::CreateAndAdd(browser_context, kChromeUIHistogramHost);
source->OverrideContentSecurityPolicy(
network::mojom::CSPDirectiveName::ScriptSrc,
"script-src chrome://resources chrome://webui-test 'self';");
source->AddResourcePaths(kHistogramsResources);
source->SetDefaultResource(IDR_HISTOGRAMS_HISTOGRAMS_INTERNALS_HTML);
}
// This class receives javascript messages from the renderer.
// Note that the WebUI infrastructure runs on the UI thread, therefore all of
// this class's methods are expected to run on the UI thread.
class HistogramsMessageHandler : public WebUIMessageHandler {
public:
HistogramsMessageHandler();
HistogramsMessageHandler(const HistogramsMessageHandler&) = delete;
HistogramsMessageHandler& operator=(const HistogramsMessageHandler&) = delete;
~HistogramsMessageHandler() override;
// WebUIMessageHandler:
void RegisterMessages() override;
private:
void HandleRequestHistograms(const base::Value::List& args);
void HandleStartMoninoring(const base::Value::List& args);
void HandleFetchDiff(const base::Value::List& args);
// Calls AllowJavascript() and unpacks the passed params.
JsParams AllowJavascriptAndUnpackParams(const base::Value::List& args);
// Import histograms, and those from subprocesses if |include_subprocesses| is
// true.
void ImportHistograms(bool include_subprocesses);
HistogramsMonitor histogram_monitor_;
};
HistogramsMessageHandler::HistogramsMessageHandler() = default;
HistogramsMessageHandler::~HistogramsMessageHandler() = default;
JsParams HistogramsMessageHandler::AllowJavascriptAndUnpackParams(
const base::Value::List& args_list) {
AllowJavascript();
JsParams params;
if (args_list.size() > 0u && args_list[0].is_string())
params.callback_id = args_list[0].GetString();
if (args_list.size() > 1u && args_list[1].is_string())
params.query = args_list[1].GetString();
if (args_list.size() > 2u && args_list[2].is_bool())
params.include_subprocesses = args_list[2].GetBool();
return params;
}
void HistogramsMessageHandler::ImportHistograms(bool include_subprocesses) {
if (include_subprocesses) {
// Synchronously fetch subprocess histograms that live in shared memory.
base::StatisticsRecorder::ImportProvidedHistogramsSync();
// Asynchronously fetch subprocess histograms that do not live in shared
// memory (e.g., they were emitted before the shared memory was set up).
HistogramSynchronizer::FetchHistograms();
}
}
void HistogramsMessageHandler::HandleRequestHistograms(
const base::Value::List& args) {
JsParams params = AllowJavascriptAndUnpackParams(args);
ImportHistograms(params.include_subprocesses);
base::Value::List histograms_list;
for (base::HistogramBase* histogram :
base::StatisticsRecorder::Sort(base::StatisticsRecorder::WithName(
base::StatisticsRecorder::GetHistograms(), params.query,
/*case_sensitive=*/false))) {
base::Value::Dict histogram_dict = histogram->ToGraphDict();
if (!histogram_dict.empty())
histograms_list.Append(std::move(histogram_dict));
}
ResolveJavascriptCallback(base::Value(params.callback_id), histograms_list);
}
void HistogramsMessageHandler::HandleStartMoninoring(
const base::Value::List& args) {
JsParams params = AllowJavascriptAndUnpackParams(args);
ImportHistograms(params.include_subprocesses);
histogram_monitor_.StartMonitoring();
ResolveJavascriptCallback(base::Value(params.callback_id),
base::Value("Success"));
}
void HistogramsMessageHandler::HandleFetchDiff(const base::Value::List& args) {
JsParams params = AllowJavascriptAndUnpackParams(args);
ImportHistograms(params.include_subprocesses);
base::Value::List histograms_list = histogram_monitor_.GetDiff(params.query);
ResolveJavascriptCallback(base::Value(params.callback_id),
std::move(histograms_list));
}
void HistogramsMessageHandler::RegisterMessages() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// We can use base::Unretained() here, as both the callback and this class are
// owned by HistogramsInternalsUI.
web_ui()->RegisterMessageCallback(
kHistogramsUIRequestHistograms,
base::BindRepeating(&HistogramsMessageHandler::HandleRequestHistograms,
base::Unretained(this)));
web_ui()->RegisterMessageCallback(
kHistogramsUIStartMonitoring,
base::BindRepeating(&HistogramsMessageHandler::HandleStartMoninoring,
base::Unretained(this)));
web_ui()->RegisterMessageCallback(
kHistogramsUIFetchDiff,
base::BindRepeating(&HistogramsMessageHandler::HandleFetchDiff,
base::Unretained(this)));
}
} // namespace
HistogramsInternalsUI::HistogramsInternalsUI(WebUI* web_ui)
: WebUIController(web_ui) {
web_ui->AddMessageHandler(std::make_unique<HistogramsMessageHandler>());
// Set up the chrome://histograms/ source.
CreateAndAddHistogramsHTMLSource(
web_ui->GetWebContents()->GetBrowserContext());
}
} // namespace content
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