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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_SIGNALING_MESSAGE_TRACKER_H_
#define REMOTING_SIGNALING_MESSAGE_TRACKER_H_
#include <map>
#include <string>
#include "base/time/time.h"
#include "base/timer/timer.h"
namespace remoting {
// FTL messaging doesn't guarantee a message won't be received more than once,
// so this class helps deduplicating messages based on their message ID.
class MessageTracker final {
public:
MessageTracker();
MessageTracker(const MessageTracker&) = delete;
MessageTracker& operator=(const MessageTracker&) = delete;
~MessageTracker();
// Tracks |id|. If |id| is already tracked then it will update its tracking
// time to now.
void TrackId(const std::string& id);
// Returns true if |id| has been tracked within the tracking window.
//
// The tracking window is at least (now - kCleanupInterval, now), and can be
// up to (now - 2 * kCleanupInterval, now).
bool IsIdTracked(const std::string& id) const;
private:
friend class MessageTrackerTest;
// All IDs older than now - kCleanupInterval will be eventually removed, but
// they are not guaranteed to be immediately removed after the interval.
static const base::TimeDelta kCleanupInterval;
void RemoveExpiredIds();
std::map<std::string, base::Time> tracked_ids_;
base::OneShotTimer cleanup_timer_;
};
} // namespace remoting
#endif // REMOTING_SIGNALING_MESSAGE_TRACKER_H_
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