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/*
* Copyright 2013 Canonical Ltd.
* Copyright 2021 Robert Tari
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3, as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
* Robert Tari <robert@tari.in>
*/
#include <datetime/clock.h>
#include <datetime/timezone.h>
#include <glib-unix.h> // g_unix_fd_add()
#include <sys/timerfd.h>
#include <unistd.h> // close()
#ifndef TFD_TIMER_CANCEL_ON_SET
#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
#endif
namespace ayatana {
namespace indicator {
namespace datetime {
/***
****
***/
class LiveClock::Impl
{
public:
Impl(LiveClock& owner, const std::shared_ptr<const Timezone>& timezone_):
m_owner(owner),
m_timezone(timezone_)
{
if (m_timezone)
{
auto setter = [this](const std::string& z){setTimezone(z);};
m_timezone->timezone.changed().connect(setter);
setter(m_timezone->timezone.get());
}
reset_timer();
refresh();
}
~Impl()
{
unset_timer();
g_clear_pointer(&m_gtimezone, g_time_zone_unref);
}
DateTime localtime() const
{
g_assert(m_gtimezone != nullptr);
auto gdt = g_date_time_new_now(m_gtimezone);
DateTime ret(m_gtimezone, gdt);
g_date_time_unref(gdt);
return ret;
}
private:
void unset_timer()
{
if (m_timerfd_tag != 0)
{
g_source_remove(m_timerfd_tag);
m_timerfd_tag = 0;
}
if (m_timerfd != -1)
{
close(m_timerfd);
m_timerfd = -1;
}
}
void reset_timer()
{
// clear out any previous timer
unset_timer();
// create a new timer
m_timerfd = timerfd_create(CLOCK_REALTIME, 0);
if (m_timerfd == -1)
g_error("unable to create realtime timer: %s", g_strerror(errno));
// set args to fire at the beginning of the next minute...
struct itimerspec timerval;
int flags = TFD_TIMER_ABSTIME;
auto now = g_date_time_new_now(m_gtimezone);
auto next = g_date_time_add_minutes(now, 1);
auto start_of_next = g_date_time_add_seconds(next, -g_date_time_get_seconds(next));
timerval.it_value.tv_sec = g_date_time_to_unix(start_of_next);
timerval.it_value.tv_nsec = 0;
g_date_time_unref(start_of_next);
g_date_time_unref(next);
g_date_time_unref(now);
// ...and also to fire at the beginning of every subsequent minute...
timerval.it_interval.tv_sec = 60;
timerval.it_interval.tv_nsec = 0;
// ...and also to fire if someone changes the time
// manually (eg toggling from manual<->ntp)
flags |= TFD_TIMER_CANCEL_ON_SET;
if (timerfd_settime(m_timerfd, flags, &timerval, NULL) == -1)
g_error("timerfd_settime failed: %s", g_strerror(errno));
// listen for the changes/timers
m_timerfd_tag = g_unix_fd_add(m_timerfd,
(GIOCondition)(G_IO_IN|G_IO_HUP|G_IO_ERR),
on_timerfd_cond,
this);
}
static gboolean on_timerfd_cond (gint fd, GIOCondition cond, gpointer gself)
{
auto self = static_cast<Impl*>(gself);
int n_bytes = 0;
uint64_t n_interrupts = 0;
if (cond & G_IO_IN)
n_bytes = read(fd, &n_interrupts, sizeof(uint64_t));
if ((n_interrupts==0) || (n_bytes!=sizeof(uint64_t)))
{
auto now = g_date_time_new_now(self->m_gtimezone);
auto now_str = g_date_time_format(now, "%F %T");
g_debug("%s triggered at %s.%06d by GIOCondition %d, read %zd bytes, found %zu interrupts",
G_STRFUNC, now_str, g_date_time_get_microsecond(now),
(int)cond, (ssize_t)n_bytes, (size_t)n_interrupts);
g_free(now_str);
g_date_time_unref(now);
// reset the timer in case someone changed the system clock
self->reset_timer();
}
self->refresh();
return G_SOURCE_CONTINUE;
}
/***
****
***/
void setTimezone(const std::string& str)
{
g_clear_pointer(&m_gtimezone, g_time_zone_unref);
#if GLIB_CHECK_VERSION(2, 68, 0)
m_gtimezone = g_time_zone_new_identifier(str.c_str());
if (m_gtimezone == NULL)
{
m_gtimezone = g_time_zone_new_utc();
}
#else
m_gtimezone = g_time_zone_new(str.c_str());
#endif
m_owner.minute_changed();
}
/***
****
***/
void refresh()
{
const auto now = localtime();
// maybe emit change signals
if (!DateTime::is_same_minute(m_prev_datetime, now))
m_owner.minute_changed();
if (!DateTime::is_same_day(m_prev_datetime, now))
m_owner.date_changed();
m_prev_datetime = now;
}
protected:
LiveClock& m_owner;
GTimeZone* m_gtimezone = nullptr;
std::shared_ptr<const Timezone> m_timezone;
DateTime m_prev_datetime;
int m_timerfd = -1;
guint m_timerfd_tag = 0;
};
LiveClock::LiveClock(const std::shared_ptr<const Timezone>& timezone_):
p(new Impl(*this, timezone_))
{
}
LiveClock::~LiveClock() =default;
DateTime LiveClock::localtime() const
{
return p->localtime();
}
/***
****
***/
} // namespace datetime
} // namespace indicator
} // namespace ayatana
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