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/*
* Copyright 2003-2018 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 "AvahiPoll.hxx"
#include "event/SocketMonitor.hxx"
#include "event/TimerEvent.hxx"
static unsigned
FromAvahiWatchEvent(AvahiWatchEvent e)
{
return (e & AVAHI_WATCH_IN ? SocketMonitor::READ : 0) |
(e & AVAHI_WATCH_OUT ? SocketMonitor::WRITE : 0) |
(e & AVAHI_WATCH_ERR ? SocketMonitor::ERROR : 0) |
(e & AVAHI_WATCH_HUP ? SocketMonitor::HANGUP : 0);
}
static AvahiWatchEvent
ToAvahiWatchEvent(unsigned e)
{
return AvahiWatchEvent((e & SocketMonitor::READ ? AVAHI_WATCH_IN : 0) |
(e & SocketMonitor::WRITE ? AVAHI_WATCH_OUT : 0) |
(e & SocketMonitor::ERROR ? AVAHI_WATCH_ERR : 0) |
(e & SocketMonitor::HANGUP ? AVAHI_WATCH_HUP : 0));
}
struct AvahiWatch final : private SocketMonitor {
private:
const AvahiWatchCallback callback;
void *const userdata;
AvahiWatchEvent received;
public:
AvahiWatch(SocketDescriptor _fd, AvahiWatchEvent _event,
AvahiWatchCallback _callback, void *_userdata,
EventLoop &_loop)
:SocketMonitor(_fd, _loop),
callback(_callback), userdata(_userdata),
received(AvahiWatchEvent(0)) {
Schedule(FromAvahiWatchEvent(_event));
}
static void WatchUpdate(AvahiWatch *w, AvahiWatchEvent event) {
w->Schedule(FromAvahiWatchEvent(event));
}
static AvahiWatchEvent WatchGetEvents(AvahiWatch *w) {
return w->received;
}
static void WatchFree(AvahiWatch *w) {
delete w;
}
private:
/* virtual methods from class SocketMonitor */
bool OnSocketReady(unsigned flags) noexcept {
received = ToAvahiWatchEvent(flags);
callback(this, GetSocket().Get(), received, userdata);
received = AvahiWatchEvent(0);
return true;
}
};
static constexpr std::chrono::steady_clock::duration
TimevalToChrono(const timeval &tv)
{
return std::chrono::seconds(tv.tv_sec) + std::chrono::microseconds(tv.tv_usec);
}
struct AvahiTimeout final {
TimerEvent timer;
const AvahiTimeoutCallback callback;
void *const userdata;
public:
AvahiTimeout(const struct timeval *tv,
AvahiTimeoutCallback _callback, void *_userdata,
EventLoop &_loop)
:timer(_loop, BIND_THIS_METHOD(OnTimeout)),
callback(_callback), userdata(_userdata) {
if (tv != nullptr)
timer.Schedule(TimevalToChrono(*tv));
}
static void TimeoutUpdate(AvahiTimeout *t, const struct timeval *tv) {
if (tv != nullptr)
t->timer.Schedule(TimevalToChrono(*tv));
else
t->timer.Cancel();
}
static void TimeoutFree(AvahiTimeout *t) {
delete t;
}
private:
void OnTimeout() {
callback(this, userdata);
}
};
MyAvahiPoll::MyAvahiPoll(EventLoop &_loop):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 *
MyAvahiPoll::WatchNew(const AvahiPoll *api, int fd, AvahiWatchEvent event,
AvahiWatchCallback callback, void *userdata) {
const MyAvahiPoll &poll = *(const MyAvahiPoll *)api;
return new AvahiWatch(SocketDescriptor(fd), event, callback, userdata,
poll.event_loop);
}
AvahiTimeout *
MyAvahiPoll::TimeoutNew(const AvahiPoll *api, const struct timeval *tv,
AvahiTimeoutCallback callback, void *userdata) {
const MyAvahiPoll &poll = *(const MyAvahiPoll *)api;
return new AvahiTimeout(tv, callback, userdata,
poll.event_loop);
}
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