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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "LocalConnection.h"
#include "Net/Protocol/BaseNetProtocol.h"
#include "Exception.h"
#include "ProtocolDef.h"
#include "System/Log/ILog.h"
#include "System/SpringFormat.h"
namespace netcode {
// static stuff
unsigned int CLocalConnection::numInstances = 0;
std::deque< std::shared_ptr<const RawPacket> > CLocalConnection::pktQueues[CLocalConnection::MAX_INSTANCES];
spring::mutex CLocalConnection::mutexes[CLocalConnection::MAX_INSTANCES];
CLocalConnection* CLocalConnection::instancePtrs[MAX_INSTANCES] = {nullptr, nullptr};
CLocalConnection::CLocalConnection()
{
if (numInstances >= MAX_INSTANCES)
throw network_error("Opening a third local connection is not allowed");
// clear data that might have been left over (if we reloaded)
pktQueues[instanceIdx = numInstances++].clear();
instancePtrs[instanceIdx] = this;
// make sure protocoldef is initialized
CBaseNetProtocol::Get();
}
CLocalConnection::~CLocalConnection()
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
instancePtrs[instanceIdx] = nullptr;
numInstances--;
}
void CLocalConnection::Close(bool flush)
{
if (!flush)
return;
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
pktQueues[instanceIdx].clear();
}
void CLocalConnection::SendData(std::shared_ptr<const RawPacket> pkt)
{
if (!ProtocolDef::GetInstance()->IsValidPacket(pkt->data, pkt->length)) {
// having this check here makes it easier to find networking bugs, also when testing locally
LOG_L(L_ERROR, "[LocalConn::%s] discarding invalid packet: ID %d, LEN %d", __func__, (pkt->length > 0) ? (int)pkt->data[0] : -1, pkt->length);
return;
}
dataSent += pkt->length;
{
// when sending from A to B we must lock B's queue
std::lock_guard<spring::mutex> scoped_lock(mutexes[RemoteInstanceIdx()]);
// outgoing for A, incoming for B
if (instancePtrs[RemoteInstanceIdx()] != nullptr)
instancePtrs[RemoteInstanceIdx()]->numPings += (pkt->data[0] == NETMSG_PING);
pktQueues[RemoteInstanceIdx()].push_back(pkt);
}
}
std::shared_ptr<const RawPacket> CLocalConnection::GetData()
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
std::deque<std::shared_ptr<const RawPacket>>& pktQueue = pktQueues[instanceIdx];
if (pktQueue.empty())
return {};
std::shared_ptr<const RawPacket> pkt = pktQueue.front();
pktQueue.pop_front();
dataRecv += pkt->length;
numPings -= (pkt->data[0] == NETMSG_PING);
return pkt;
}
std::shared_ptr<const RawPacket> CLocalConnection::Peek(unsigned ahead) const
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
std::deque<std::shared_ptr<const RawPacket>>& pktQueue = pktQueues[instanceIdx];
if (ahead >= pktQueue.size())
return {};
return pktQueue[ahead];
}
void CLocalConnection::DeleteBufferPacketAt(unsigned index)
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
std::deque<std::shared_ptr<const RawPacket>>& pktQueue = pktQueues[instanceIdx];
if (index >= pktQueue.size())
return;
numPings -= (pktQueue[0]->data[0] == NETMSG_PING);
pktQueue.erase(pktQueue.begin() + index);
}
std::string CLocalConnection::Statistics() const
{
std::string msg = "[LocalConnection::Statistics]\n";
msg += spring::format("\t%u bytes sent \n", dataSent);
msg += spring::format("\t%u bytes recv'd\n", dataRecv);
return msg;
}
bool CLocalConnection::HasIncomingData() const
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
return (!pktQueues[instanceIdx].empty());
}
unsigned int CLocalConnection::GetPacketQueueSize() const
{
std::lock_guard<spring::mutex> scoped_lock(mutexes[instanceIdx]);
return (!pktQueues[instanceIdx].size());
}
} // namespace netcode
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