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// SPDX-License-Identifier: GPL-2.0-or-later
/*
This file is part of Warzone 2100.
Copyright (C) 2025 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "gns_connection_poll_group.h"
#include "lib/netplay/gns/gns_connection_poll_group.h"
#include "lib/netplay/gns/gns_client_connection.h"
#include "lib/netplay/gns/gns_error_categories.h"
#include "lib/framework/frame.h" // for `ASSERT`
#include <array>
#include <unordered_set>
#include <steam/isteamnetworkingsockets.h>
namespace gns
{
GNSConnectionPollGroup::GNSConnectionPollGroup(ISteamNetworkingSockets* networkInterface, HSteamNetPollGroup group)
: networkInterface_(networkInterface), group_(group)
{
ASSERT(networkInterface_ != nullptr && group_ != k_HSteamNetPollGroup_Invalid, "Invalid internal GNS handles");
}
GNSConnectionPollGroup::~GNSConnectionPollGroup()
{
ASSERT(networkInterface_->DestroyPollGroup(group_) == true, "Passed invalid group handle");
}
net::result<int> GNSConnectionPollGroup::checkConnectionsReadable(std::chrono::milliseconds timeout)
{
if (connections_.empty())
{
return 0;
}
constexpr int MAX_RECV_MESG_COUNT = 1024;
std::array<SteamNetworkingMessage_t*, MAX_RECV_MESG_COUNT> receivedMsgs;
auto msgCount = networkInterface_->ReceiveMessagesOnPollGroup(group_, receivedMsgs.data(), MAX_RECV_MESG_COUNT);
if (msgCount < 0)
{
return tl::make_unexpected(make_gns_error_code(-msgCount));
}
else if (msgCount == 0)
{
return connections_.size();
}
readyConns_.clear();
// Put each message in the corresponding `GNSClientConnection` object's message queue
for (size_t i = 0; i < msgCount; ++i)
{
SteamNetworkingMessage_t* msg = receivedMsgs[i];
connections_.at(msg->m_conn)->enqueueMessage(msg);
readyConns_.emplace(msg->m_conn);
}
return readyConns_.size();
}
void GNSConnectionPollGroup::add(IClientConnection* conn)
{
auto* gnsConn = dynamic_cast<GNSClientConnection*>(conn);
ASSERT_OR_RETURN(, gnsConn != nullptr, "Expected GNSClientConnection instance");
ASSERT_OR_RETURN(, gnsConn->getPollGroup() == nullptr, "Connection belongs to another poll group");
ASSERT_OR_RETURN(, gnsConn->isValid(), "Invalid GNS client connection handle");
ASSERT_OR_RETURN(, networkInterface_->SetConnectionPollGroup(gnsConn->connectionHandle(), group_),
"Failed to assign connection %u to poll group %u", gnsConn->connectionHandle(), group_);
connections_.emplace(gnsConn->connectionHandle(), gnsConn);
gnsConn->setPollGroup(this);
}
void GNSConnectionPollGroup::remove(IClientConnection* conn)
{
auto* gnsConn = dynamic_cast<GNSClientConnection*>(conn);
ASSERT_OR_RETURN(, gnsConn != nullptr, "Expected GNSClientConnection instance");
if (gnsConn->isValid())
{
ASSERT(networkInterface_->SetConnectionPollGroup(gnsConn->connectionHandle(), k_HSteamNetPollGroup_Invalid),
"Failed to remove connection %u from poll group %u", gnsConn->connectionHandle(), group_);
connections_.erase(gnsConn->connectionHandle());
}
gnsConn->setPollGroup(nullptr);
}
} // namespace gns
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