1 // Copyright 2024 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef COMPONENTS_NETWORK_TIME_TIME_TRACKER_TIME_TRACKER_H_ 6 #define COMPONENTS_NETWORK_TIME_TIME_TRACKER_TIME_TRACKER_H_ 7 8 #include "base/time/time.h" 9 10 namespace network_time { 11 12 // A class that's created with a known good time, and provides an estimate of 13 // the current time by adding the system clock seconds that have elapsed since 14 // it was created. 15 class TimeTracker { 16 public: 17 struct TimeTrackerState { 18 base::Time system_time; 19 base::TimeTicks system_ticks; 20 base::Time known_time; 21 base::TimeDelta uncertainty; 22 }; 23 TimeTracker(const base::Time& system_time, 24 const base::TimeTicks& system_ticks, 25 const base::Time& time, 26 const base::TimeDelta& uncertainty); 27 ~TimeTracker() = default; 28 29 // Returns true if the time is available, false otherwise (e.g. if sync was 30 // lost). Sets |estimated_ time| to an estimate of the true time. If 31 // |uncertainty| is non-NULL, it will be set to an estimate of the error 32 // range. |system_time| and |system_ticks| should come from the same clocks 33 // used to retrieve the system time on creation. 34 bool GetTime(const base::Time& system_time, 35 const base::TimeTicks& system_ticks, 36 base::Time* time, 37 base::TimeDelta* uncertainty) const; 38 GetStateAtCreation()39 TimeTrackerState GetStateAtCreation() const { return state_; } 40 41 private: 42 TimeTrackerState state_; 43 }; 44 45 } // namespace network_time 46 47 #endif // COMPONENTS_NETWORK_TIME_TIME_TRACKER_TIME_TRACKER_H_ 48