392 lines
11 KiB
C++
392 lines
11 KiB
C++
// Copyright 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "utils/datetime.hpp"
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extern "C" {
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#include <sys/time.h>
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#include <time.h>
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}
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#include "utils/optional.ipp"
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#include "utils/sanity.hpp"
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namespace datetime = utils::datetime;
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using utils::none;
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using utils::optional;
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namespace {
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/// Fake value for the current time.
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static optional< datetime::timestamp > mock_now = none;
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} // anonymous namespace
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/// Creates a zero time delta.
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datetime::delta::delta(void) :
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seconds(0),
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useconds(0)
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{
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}
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/// Creates a time delta.
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///
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/// \param seconds_ The seconds in the delta.
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/// \param useconds_ The microseconds in the delta.
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datetime::delta::delta(const int64_t seconds_,
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const unsigned long useconds_) :
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seconds(seconds_),
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useconds(useconds_)
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{
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}
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/// Converts a time expressed in microseconds to a delta.
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///
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/// \param useconds The amount of microseconds representing the delta.
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///
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/// \return A new delta object.
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datetime::delta
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datetime::delta::from_microseconds(const int64_t useconds)
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{
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return delta(useconds / 1000000, useconds % 1000000);
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}
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/// Convers the delta to a flat representation expressed in microseconds.
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///
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/// \return The amount of microseconds that corresponds to this delta.
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int64_t
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datetime::delta::to_microseconds(void) const
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{
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return seconds * 1000000 + useconds;
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}
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/// Checks if two time deltas are equal.
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///
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/// \param other The object to compare to.
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///
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/// \return True if the two time deltas are equals; false otherwise.
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bool
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datetime::delta::operator==(const datetime::delta& other) const
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{
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return seconds == other.seconds && useconds == other.useconds;
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}
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/// Checks if two time deltas are different.
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///
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/// \param other The object to compare to.
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///
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/// \return True if the two time deltas are different; false otherwise.
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bool
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datetime::delta::operator!=(const datetime::delta& other) const
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{
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return !(*this == other);
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}
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/// Adds a time delta to this one.
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///
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/// \param other The time delta to add.
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///
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/// \return The addition of this time delta with the other time delta.
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datetime::delta
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datetime::delta::operator+(const datetime::delta& other) const
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{
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return delta::from_microseconds(to_microseconds() +
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other.to_microseconds());
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}
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/// Adds a time delta to this one and updates this with the result.
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///
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/// \param other The time delta to add.
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///
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/// \return The addition of this time delta with the other time delta.
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datetime::delta
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datetime::delta::operator+=(const datetime::delta& other)
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{
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*this = *this + other;
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return *this;
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}
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/// Injects the object into a stream.
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///
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/// \param output The stream into which to inject the object.
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/// \param object The object to format.
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///
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/// \return The output stream.
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std::ostream&
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datetime::operator<<(std::ostream& output, const delta& object)
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{
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return (output << object.to_microseconds() << "us");
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}
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namespace utils {
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namespace datetime {
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/// Internal representation for datetime::timestamp.
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struct timestamp::impl {
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/// The raw timestamp as provided by libc.
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::timeval data;
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/// Constructs an impl object from initialized data.
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///
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/// \param data_ The raw timestamp to use.
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impl(const ::timeval& data_) : data(data_)
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{
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}
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};
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} // namespace datetime
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} // namespace utils
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/// Constructs a new timestamp.
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///
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/// \param pimpl_ An existing impl representation.
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datetime::timestamp::timestamp(std::shared_ptr< impl > pimpl_) :
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_pimpl(pimpl_)
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{
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}
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/// Constructs a timestamp from the amount of microseconds since the epoch.
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///
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/// \param value Microseconds since the epoch in UTC. Must be positive.
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///
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/// \return A new timestamp.
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datetime::timestamp
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datetime::timestamp::from_microseconds(const int64_t value)
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{
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PRE(value >= 0);
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::timeval data;
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data.tv_sec = static_cast< time_t >(value / 1000000);
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data.tv_usec = static_cast< suseconds_t >(value % 1000000);
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return timestamp(std::shared_ptr< impl >(new impl(data)));
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}
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/// Constructs a timestamp based on user-friendly values.
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///
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/// \param year The year in the [1900,inf) range.
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/// \param month The month in the [1,12] range.
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/// \param day The day in the [1,30] range.
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/// \param hour The hour in the [0,23] range.
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/// \param minute The minute in the [0,59] range.
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/// \param second The second in the [0,60] range. Yes, that is 60, which can be
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/// the case on leap seconds.
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/// \param microsecond The microsecond in the [0,999999] range.
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///
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/// \return A new timestamp.
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datetime::timestamp
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datetime::timestamp::from_values(const int year, const int month,
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const int day, const int hour,
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const int minute, const int second,
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const int microsecond)
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{
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PRE(year >= 1900);
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PRE(month >= 1 && month <= 12);
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PRE(day >= 1 && day <= 30);
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PRE(hour >= 0 && hour <= 23);
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PRE(minute >= 0 && minute <= 59);
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PRE(second >= 0 && second <= 60);
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PRE(microsecond >= 0 && microsecond <= 999999);
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// The code below is quite convoluted. The problem is that we can't assume
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// that some fields (like tm_zone) of ::tm exist, and thus we can't blindly
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// set them from the code. Instead of detecting their presence in the
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// configure script, we just query the current time to initialize such
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// fields and then we override the ones we are interested in. (There might
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// be some better way to do this, but I don't know it and the documentation
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// does not shed much light into how to create your own fake date.)
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const time_t current_time = ::time(NULL);
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::tm timedata;
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if (::gmtime_r(¤t_time, &timedata) == NULL)
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UNREACHABLE;
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timedata.tm_sec = second;
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timedata.tm_min = minute;
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timedata.tm_hour = hour;
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timedata.tm_mday = day;
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timedata.tm_mon = month - 1;
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timedata.tm_year = year - 1900;
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// Ignored: timedata.tm_wday
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// Ignored: timedata.tm_yday
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::timeval data;
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data.tv_sec = ::mktime(&timedata);
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data.tv_usec = static_cast< suseconds_t >(microsecond);
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return timestamp(std::shared_ptr< impl >(new impl(data)));
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}
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/// Constructs a new timestamp representing the current time in UTC.
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///
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/// \return A new timestamp.
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datetime::timestamp
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datetime::timestamp::now(void)
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{
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if (mock_now)
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return mock_now.get();
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::timeval data;
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{
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#if defined(__minix) && !defined(NDEBUG)
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const int ret =
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#endif /* defined(__minix) && !defined(NDEBUG) */
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::gettimeofday(&data, NULL);
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INV(ret != -1);
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}
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return timestamp(std::shared_ptr< impl >(new impl(data)));
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}
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/// Formats a timestamp.
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///
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/// \param format The format string to use as consumed by strftime(3).
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///
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/// \return The formatted time.
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std::string
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datetime::timestamp::strftime(const std::string& format) const
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{
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::tm timedata;
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// This conversion to time_t is necessary because tv_sec is not guaranteed
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// to be a time_t. For example, it isn't in NetBSD 5.x
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::time_t epoch_seconds;
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epoch_seconds = _pimpl->data.tv_sec;
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if (::gmtime_r(&epoch_seconds, &timedata) == NULL)
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UNREACHABLE_MSG("gmtime_r(3) did not accept the value returned by "
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"gettimeofday(2)");
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char buf[128];
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if (::strftime(buf, sizeof(buf), format.c_str(), &timedata) == 0)
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UNREACHABLE_MSG("Arbitrary-long format strings are unimplemented");
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return buf;
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}
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/// Returns the number of microseconds since the epoch in UTC.
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///
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/// \return A number of microseconds.
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int64_t
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datetime::timestamp::to_microseconds(void) const
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{
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return static_cast< int64_t >(_pimpl->data.tv_sec) * 1000000 +
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_pimpl->data.tv_usec;
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}
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/// Returns the number of seconds since the epoch in UTC.
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///
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/// \return A number of seconds.
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int64_t
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datetime::timestamp::to_seconds(void) const
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{
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return static_cast< int64_t >(_pimpl->data.tv_sec);
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}
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/// Sets the current time for testing purposes.
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void
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datetime::set_mock_now(const int year, const int month,
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const int day, const int hour,
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const int minute, const int second,
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const int microsecond)
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{
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mock_now = timestamp::from_values(year, month, day, hour, minute, second,
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microsecond);
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}
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/// Checks if two timestamps are equal.
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///
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/// \param other The object to compare to.
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///
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/// \return True if the two timestamps are equals; false otherwise.
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bool
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datetime::timestamp::operator==(const datetime::timestamp& other) const
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{
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return _pimpl->data.tv_sec == other._pimpl->data.tv_sec &&
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_pimpl->data.tv_usec == other._pimpl->data.tv_usec;
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}
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/// Checks if two timestamps are different.
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///
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/// \param other The object to compare to.
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///
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/// \return True if the two timestamps are different; false otherwise.
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bool
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datetime::timestamp::operator!=(const datetime::timestamp& other) const
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{
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return !(*this == other);
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}
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/// Calculates the delta between two timestamps.
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///
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/// \param other The subtrahend.
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///
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/// \return The difference between this object and the other object.
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datetime::delta
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datetime::timestamp::operator-(const datetime::timestamp& other) const
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{
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return datetime::delta::from_microseconds(to_microseconds() -
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other.to_microseconds());
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}
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/// Injects the object into a stream.
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///
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/// \param output The stream into which to inject the object.
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/// \param object The object to format.
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///
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/// \return The output stream.
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std::ostream&
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datetime::operator<<(std::ostream& output, const timestamp& object)
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{
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return (output << object.to_microseconds() << "us");
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}
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