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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "Poll.hxx"
#include "event/SocketEvent.hxx"
#include "event/CoarseTimerEvent.hxx"
#include "time/Convert.hxx"
static constexpr unsigned
FromAvahiWatchEvent(AvahiWatchEvent e) noexcept
{
return (e & AVAHI_WATCH_IN ? SocketEvent::READ : 0) |
(e & AVAHI_WATCH_OUT ? SocketEvent::WRITE : 0);
}
static constexpr AvahiWatchEvent
ToAvahiWatchEvent(unsigned e) noexcept
{
return AvahiWatchEvent((e & SocketEvent::READ ? AVAHI_WATCH_IN : 0) |
(e & SocketEvent::WRITE ? AVAHI_WATCH_OUT : 0) |
(e & SocketEvent::ERROR ? AVAHI_WATCH_ERR : 0) |
(e & SocketEvent::HANGUP ? AVAHI_WATCH_HUP : 0));
}
struct AvahiWatch final {
private:
SocketEvent event;
const AvahiWatchCallback callback;
void *const userdata;
AvahiWatchEvent received = AvahiWatchEvent(0);
public:
AvahiWatch(EventLoop &_loop,
SocketDescriptor _fd, AvahiWatchEvent _event,
AvahiWatchCallback _callback, void *_userdata) noexcept
:event(_loop, BIND_THIS_METHOD(OnSocketReady), _fd),
callback(_callback), userdata(_userdata) {
event.Schedule(FromAvahiWatchEvent(_event));
}
static void WatchUpdate(AvahiWatch *w,
AvahiWatchEvent _event) noexcept {
w->event.Schedule(FromAvahiWatchEvent(_event));
}
static AvahiWatchEvent WatchGetEvents(AvahiWatch *w) noexcept {
return w->received;
}
static void WatchFree(AvahiWatch *w) noexcept {
delete w;
}
private:
void OnSocketReady(unsigned events) noexcept {
received = ToAvahiWatchEvent(events);
callback(this, event.GetSocket().Get(), received, userdata);
received = AvahiWatchEvent(0);
}
};
struct AvahiTimeout final {
CoarseTimerEvent event;
const AvahiTimeoutCallback callback;
void *const userdata;
public:
AvahiTimeout(EventLoop &_loop, const struct timeval *tv,
AvahiTimeoutCallback _callback, void *_userdata) noexcept
:event(_loop, BIND_THIS_METHOD(OnTimeout)),
callback(_callback), userdata(_userdata) {
if (tv != nullptr)
Schedule(*tv);
}
static void TimeoutUpdate(AvahiTimeout *t,
const struct timeval *tv) noexcept {
if (tv != nullptr)
t->Schedule(*tv);
else
t->event.Cancel();
}
static void TimeoutFree(AvahiTimeout *t) noexcept {
delete t;
}
private:
[[gnu::pure]]
Event::Duration AbsoluteToDuration(const struct timeval &tv) noexcept {
if (tv.tv_sec == 0)
/* schedule immediately */
return {};
struct timeval now;
if (gettimeofday(&now, nullptr) < 0)
/* shouldn't ever fail, but if it does, do
something reasonable */
return std::chrono::seconds(1);
auto d = ToSteadyClockDuration(tv)
- ToSteadyClockDuration(now);
if (d.count() < 0)
return {};
return d;
}
void Schedule(const struct timeval &tv) noexcept {
event.Schedule(AbsoluteToDuration(tv));
}
void OnTimeout() noexcept {
callback(this, userdata);
}
};
namespace Avahi {
Poll::Poll(EventLoop &_loop) noexcept
:event_loop(_loop)
{
watch_new = WatchNew;
watch_update = AvahiWatch::WatchUpdate;
watch_get_events = AvahiWatch::WatchGetEvents;
watch_free = AvahiWatch::WatchFree;
timeout_new = TimeoutNew;
timeout_update = AvahiTimeout::TimeoutUpdate;
timeout_free = AvahiTimeout::TimeoutFree;
}
AvahiWatch *
Poll::WatchNew(const AvahiPoll *api, int fd, AvahiWatchEvent event,
AvahiWatchCallback callback, void *userdata) noexcept
{
const Poll &poll = *(const Poll *)api;
return new AvahiWatch(poll.event_loop, SocketDescriptor(fd), event,
callback, userdata);
}
AvahiTimeout *
Poll::TimeoutNew(const AvahiPoll *api, const struct timeval *tv,
AvahiTimeoutCallback callback, void *userdata) noexcept
{
const Poll &poll = *(const Poll *)api;
return new AvahiTimeout(poll.event_loop, tv, callback, userdata);
}
} // namespace Avahi
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