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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_STRUCTURED_EXTERNAL_METRICS_H_
#define COMPONENTS_METRICS_STRUCTURED_EXTERNAL_METRICS_H_
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
namespace metrics {
namespace structured {
class EventsProto;
class ExternalMetricsTest;
// ExternalMetrics reads structured metrics saved by Chrome OS and uploads them
// to the UMA server on its behalf. This is structured metrics' equivalent of
// `ash::ExternalMetrics`.
//
// Chrome periodically reads a directory of protos and adds their content into
// the StructuredMetricProvider's regular metrics upload. After reading each
// file, it is deleted. Chrome and ChromeOS use flock to prevent concurrent
// read/writes.
class ExternalMetrics {
public:
using MetricsCollectedCallback =
base::RepeatingCallback<void(const EventsProto&)>;
ExternalMetrics(const base::FilePath& events_directory,
const base::TimeDelta& collection_interval,
MetricsCollectedCallback callback);
~ExternalMetrics();
ExternalMetrics(const ExternalMetrics&) = delete;
ExternalMetrics& operator=(const ExternalMetrics&) = delete;
private:
friend class ExternalMetricsTest;
void ScheduleCollector();
void CollectEventsAndReschedule();
void CollectEvents();
const base::FilePath events_directory_;
const base::TimeDelta collection_interval_;
MetricsCollectedCallback callback_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<ExternalMetrics> weak_factory_{this};
};
} // namespace structured
} // namespace metrics
#endif // COMPONENTS_METRICS_STRUCTURED_EXTERNAL_METRICS_H_
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