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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.
#ifndef CHROME_BROWSER_UI_WEBUI_METRICS_INTERNALS_METRICS_INTERNALS_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_METRICS_INTERNALS_METRICS_INTERNALS_HANDLER_H_
#include <memory>
#include "base/callback_list.h"
#include "base/memory/weak_ptr.h"
#include "components/metrics/metrics_service_observer.h"
#include "content/public/browser/web_ui_message_handler.h"
// UI Handler for chrome://metrics-internals.
class MetricsInternalsHandler : public content::WebUIMessageHandler {
public:
MetricsInternalsHandler();
MetricsInternalsHandler(const MetricsInternalsHandler&) = delete;
MetricsInternalsHandler& operator=(const MetricsInternalsHandler&) = delete;
~MetricsInternalsHandler() override;
// content::WebUIMessageHandler:
void OnJavascriptAllowed() override;
void OnJavascriptDisallowed() override;
void RegisterMessages() override;
private:
// Returns true if the metrics service has its own logs event observer, which
// indicates that we should use that observer instead of our own. This happens
// if this is a debug build, or if the |kExportUmaLogsToFile| command line
// flag is present.
bool ShouldUseMetricsServiceObserver();
// Returns the UMA observer to use for tracking UMA logs. I.e., if the metrics
// service has its own observer, return that one. Otherwise, return the one
// owned by the WebUI page (|uma_log_observer_|).
metrics::MetricsServiceObserver* GetUmaObserver();
void HandleFetchVariationsSummary(const base::Value::List& args);
void HandleFetchUmaSummary(const base::Value::List& args);
void HandleFetchUmaLogsData(const base::Value::List& args);
void HandleIsUsingMetricsServiceObserver(const base::Value::List& args);
void OnUmaLogCreatedOrEvent();
// This UMA log observer keeps track of logs since its creation. It is unused
// if the UMA metrics service has its own observer that has observed all
// events since browser startup.
std::unique_ptr<metrics::MetricsServiceObserver> uma_log_observer_;
// The callback subscription to |uma_log_observer_| that notifies the WebUI
// of changes. When this subscription is destroyed, it is automatically
// de-registered from the callback list.
base::CallbackListSubscription uma_log_notified_subscription_;
base::WeakPtrFactory<MetricsInternalsHandler> weak_ptr_factory_{this};
};
#endif // CHROME_BROWSER_UI_WEBUI_METRICS_INTERNALS_METRICS_INTERNALS_HANDLER_H_
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