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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 "content/browser/histograms_internals_ui.h"
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include "base/bind.h"
#include "base/macros.h"
#include "base/metrics/histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "base/values.h"
#include "content/browser/histogram_synchronizer.h"
#include "content/grit/content_resources.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"
namespace content {
namespace {
const char kHistogramsUIJs[] = "histograms_internals.js";
const char kHistogramsUIRequestHistograms[] = "requestHistograms";
WebUIDataSource* CreateHistogramsHTMLSource() {
WebUIDataSource* source = WebUIDataSource::Create(kChromeUIHistogramHost);
source->AddResourcePath(kHistogramsUIJs, IDR_HISTOGRAMS_INTERNALS_JS);
source->SetDefaultResource(IDR_HISTOGRAMS_INTERNALS_HTML);
return source;
}
// 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() override;
// WebUIMessageHandler:
void RegisterMessages() override;
private:
void HandleRequestHistograms(const base::ListValue* args);
DISALLOW_COPY_AND_ASSIGN(HistogramsMessageHandler);
};
HistogramsMessageHandler::HistogramsMessageHandler() {}
HistogramsMessageHandler::~HistogramsMessageHandler() {}
void HistogramsMessageHandler::HandleRequestHistograms(
const base::ListValue* args) {
base::StatisticsRecorder::ImportProvidedHistograms();
HistogramSynchronizer::FetchHistograms();
AllowJavascript();
std::string callback_id;
args->GetString(0, &callback_id);
std::string query;
args->GetString(1, &query);
base::ListValue histograms_list;
for (base::HistogramBase* histogram :
base::StatisticsRecorder::Sort(base::StatisticsRecorder::WithName(
base::StatisticsRecorder::GetHistograms(), query))) {
base::DictionaryValue histogram_dict = histogram->ToGraphDict();
if (!histogram_dict.empty())
histograms_list.Append(std::move(histogram_dict));
}
ResolveJavascriptCallback(base::Value(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)));
}
} // namespace
HistogramsInternalsUI::HistogramsInternalsUI(WebUI* web_ui)
: WebUIController(web_ui) {
web_ui->AddMessageHandler(std::make_unique<HistogramsMessageHandler>());
// Set up the chrome://histograms/ source.
BrowserContext* browser_context =
web_ui->GetWebContents()->GetBrowserContext();
WebUIDataSource::Add(browser_context, CreateHistogramsHTMLSource());
}
} // namespace content
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