roughtime.googlesource.com/roughtime.git@v0.0.0-20201210012726-dd529367052d/time_source.h (about)

     1  /* Copyright 2016 The Roughtime Authors.
     2   *
     3   * Licensed under the Apache License, Version 2.0 (the "License");
     4   * you may not use this file except in compliance with the License.
     5   * You may obtain a copy of the License at
     6   *
     7   *   http://www.apache.org/licenses/LICENSE-2.0
     8   *
     9   * Unless required by applicable law or agreed to in writing, software
    10   * distributed under the License is distributed on an "AS IS" BASIS,
    11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12   * See the License for the specific language governing permissions and
    13   * limitations under the License. */
    14  
    15  #ifndef SECURITY_ROUGHTIME_TIME_SOURCE_H_
    16  #define SECURITY_ROUGHTIME_TIME_SOURCE_H_
    17  
    18  #include <stdint.h>
    19  
    20  #include <utility>
    21  
    22  #include "protocol.h"
    23  
    24  namespace roughtime {
    25  
    26  // TimeSource is an interface that can provide the current time.
    27  class TimeSource {
    28   public:
    29    virtual ~TimeSource() {}
    30  
    31    // Now returns the midpoint time in epoch-microseconds and a radius of
    32    // uncertainty.
    33    virtual std::pair<rough_time_t, uint32_t> Now() = 0;
    34  };
    35  
    36  }  // namespace roughtime
    37  
    38  #endif  // SECURITY_ROUGHTIME_TIME_SOURCE_H_