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// Copyright 2020 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.
#ifndef FUCHSIA_BASE_LEGACYMETRICS_CLIENT_H_
#define FUCHSIA_BASE_LEGACYMETRICS_CLIENT_H_
#include <fuchsia/legacymetrics/cpp/fidl.h>
#include <memory>
#include <vector>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "fuchsia/base/legacymetrics_user_event_recorder.h"
namespace cr_fuchsia {
// Used to report events & histogram data to the
// fuchsia.legacymetrics.MetricsRecorder service.
// LegacyMetricsClient must be Start()ed on an IO-capable sequence.
// Cannot be used in conjunction with other metrics reporting services.
// Must be constructed, used, and destroyed on the same sequence.
class LegacyMetricsClient {
public:
// Maximum number of Events to send to Record() at a time, so as to not exceed
// the 64KB FIDL maximum message size.
static constexpr size_t kMaxBatchSize = 50;
// Constants for FIDL reconnection with exponential backoff.
static constexpr base::TimeDelta kInitialReconnectDelay =
base::TimeDelta::FromSeconds(1);
static constexpr base::TimeDelta kMaxReconnectDelay =
base::TimeDelta::FromHours(1);
static constexpr size_t kReconnectBackoffFactor = 2;
using ReportAdditionalMetricsCallback = base::RepeatingCallback<void(
base::OnceCallback<void(std::vector<fuchsia::legacymetrics::Event>)>)>;
using NotifyFlushCallback =
base::OnceCallback<void(base::OnceClosure completion_cb)>;
LegacyMetricsClient();
~LegacyMetricsClient();
explicit LegacyMetricsClient(const LegacyMetricsClient&) = delete;
LegacyMetricsClient& operator=(const LegacyMetricsClient&) = delete;
// Starts buffering data and schedules metric reporting after every
// |report_interval|.
void Start(base::TimeDelta report_interval);
// Sets an asynchronous |callback| to be invoked just prior to reporting,
// allowing users to asynchronously gather and provide additional custom
// metrics. |callback| will receive the list of metrics when they are ready.
// Reporting is paused until |callback| is fulfilled.
// If used, then this method must be called before calling Start().
void SetReportAdditionalMetricsCallback(
ReportAdditionalMetricsCallback callback);
// Sets a |callback| which is invoked to warn that the connection to the
// remote MetricsRecorder will be terminated. The completion closure passed to
// |callback| should be invoked to signal flush completion.
void SetNotifyFlushCallback(NotifyFlushCallback callback);
// Use when caller needs an explicit flush and then disconnect, such as before
// termination. Caller will be notified when all events in the buffer are
// sent.
void FlushAndDisconnect(base::OnceClosure on_flush_complete);
private:
void ConnectAndStartReporting();
void ScheduleNextReport();
void StartReport();
void Report(std::vector<fuchsia::legacymetrics::Event> additional_metrics);
void OnMetricsRecorderDisconnected(zx_status_t status);
void OnCloseSoon();
// Incrementally sends the contents of |to_send_| to |metrics_recorder_|.
void DrainBuffer();
base::TimeDelta reconnect_delay_ = kInitialReconnectDelay;
base::TimeDelta report_interval_;
ReportAdditionalMetricsCallback report_additional_callback_;
NotifyFlushCallback notify_flush_callback_;
bool is_flushing_ = false;
bool record_ack_pending_ = false;
std::vector<fuchsia::legacymetrics::Event> to_send_;
std::unique_ptr<LegacyMetricsUserActionRecorder> user_events_recorder_;
fuchsia::legacymetrics::MetricsRecorderPtr metrics_recorder_;
base::RetainingOneShotTimer reconnect_timer_;
base::RetainingOneShotTimer report_timer_;
SEQUENCE_CHECKER(sequence_checker_);
base::OnceClosure on_flush_complete_;
// Prevents use-after-free if |report_additional_callback_| is invoked after
// |this| is destroyed.
base::WeakPtrFactory<LegacyMetricsClient> weak_factory_{this};
};
} // namespace cr_fuchsia
#endif // FUCHSIA_BASE_LEGACYMETRICS_CLIENT_H_
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