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/*
Minetest
Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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 "modchannels.h"
#include <algorithm>
#include <cassert>
#include "util/basic_macros.h"
bool ModChannel::registerConsumer(session_t peer_id)
{
// ignore if peer_id already joined
if (CONTAINS(m_client_consumers, peer_id))
return false;
m_client_consumers.push_back(peer_id);
return true;
}
bool ModChannel::removeConsumer(session_t peer_id)
{
bool found = false;
auto peer_removal_fct = [peer_id, &found](u16 p) {
if (p == peer_id)
found = true;
return p == peer_id;
};
m_client_consumers.erase(
std::remove_if(m_client_consumers.begin(),
m_client_consumers.end(), peer_removal_fct),
m_client_consumers.end());
return found;
}
bool ModChannel::canWrite() const
{
return m_state == MODCHANNEL_STATE_READ_WRITE;
}
void ModChannel::setState(ModChannelState state)
{
assert(state != MODCHANNEL_STATE_INIT);
m_state = state;
}
bool ModChannelMgr::channelRegistered(const std::string &channel) const
{
return m_registered_channels.find(channel) != m_registered_channels.end();
}
ModChannel *ModChannelMgr::getModChannel(const std::string &channel)
{
if (!channelRegistered(channel))
return nullptr;
return m_registered_channels[channel].get();
}
bool ModChannelMgr::canWriteOnChannel(const std::string &channel) const
{
const auto channel_it = m_registered_channels.find(channel);
if (channel_it == m_registered_channels.end()) {
return false;
}
return channel_it->second->canWrite();
}
void ModChannelMgr::registerChannel(const std::string &channel)
{
m_registered_channels[channel] = std::make_unique<ModChannel>(channel);
}
bool ModChannelMgr::setChannelState(const std::string &channel, ModChannelState state)
{
if (!channelRegistered(channel))
return false;
auto channel_it = m_registered_channels.find(channel);
channel_it->second->setState(state);
return true;
}
bool ModChannelMgr::removeChannel(const std::string &channel)
{
if (!channelRegistered(channel))
return false;
m_registered_channels.erase(channel);
return true;
}
bool ModChannelMgr::joinChannel(const std::string &channel, session_t peer_id)
{
if (!channelRegistered(channel))
registerChannel(channel);
return m_registered_channels[channel]->registerConsumer(peer_id);
}
bool ModChannelMgr::leaveChannel(const std::string &channel, session_t peer_id)
{
if (!channelRegistered(channel))
return false;
// Remove consumer from channel
bool consumerRemoved = m_registered_channels[channel]->removeConsumer(peer_id);
// If channel is empty, remove it
if (m_registered_channels[channel]->getChannelPeers().empty()) {
removeChannel(channel);
}
return consumerRemoved;
}
void ModChannelMgr::leaveAllChannels(session_t peer_id)
{
for (auto &channel_it : m_registered_channels)
channel_it.second->removeConsumer(peer_id);
}
static std::vector<u16> empty_channel_list;
const std::vector<u16> &ModChannelMgr::getChannelPeers(const std::string &channel) const
{
const auto &channel_it = m_registered_channels.find(channel);
if (channel_it == m_registered_channels.end())
return empty_channel_list;
return channel_it->second->getChannelPeers();
}
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