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#include "../include/sibs/DirectConnection.hpp"
#include "../include/Log.hpp"
#include <cstdio>
#include <cstring>
#ifndef WIN32
#include <arpa/inet.h>
#include <netdb.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include <udt/udt.h>
namespace sibs
{
// Max received data size allowed when receiving regular data, receive data as file to receive more data
const int MAX_RECEIVED_DATA_SIZE = 1024 * 1024 * 1; // 1Mb
DirectConnections::DirectConnections(u16 _port) :
port(_port),
alive(true)
{
UDT::startup();
eid = UDT::epoll_create();
receiveDataThread = std::thread(&DirectConnections::receiveData, this);
}
DirectConnections::~DirectConnections()
{
alive = false;
receiveDataThread.join();
for(auto &peer : peers)
{
UDT::close(peer.first);
}
UDT::epoll_release(eid);
UDT::cleanup();
}
int DirectConnections::createSocket(const Ipv4 &addressToBind, bool rendezvous, bool reuseAddr)
{
Log::debug("UDT: Creating socket for ipv4 address %s, port: %d", addressToBind.getAddress().c_str(), addressToBind.getPort());
UDTSOCKET socket = UDT::socket(AF_INET, SOCK_STREAM, IPPROTO_UDP);
if(socket == UDT::INVALID_SOCK)
{
std::string errMsg = "UDT: Failed to create socket, error: ";
errMsg += UDT::getlasterror_desc();
throw ConnectionException(errMsg);
}
UDT::setsockopt(socket, 0, UDT_RENDEZVOUS, &rendezvous, sizeof(bool));
UDT::setsockopt(socket, 0, UDT_REUSEADDR, &reuseAddr, sizeof(bool));
// Windows UDP issue
// For better performance, modify HKLM\System\CurrentControlSet\Services\Afd\Parameters\FastSendDatagramThreshold
#ifdef WIN32
int mss = 1052;
UDT::setsockopt(socket, 0, UDT_MSS, &mss, sizeof(mss));
#endif
if(UDT::bind(socket, (sockaddr*)&addressToBind.address, sizeof(addressToBind.address)) == UDT::ERROR)
{
std::string errMsg = "UDT: Failed to bind, error: ";
errMsg += UDT::getlasterror_desc();
throw ConnectionException(errMsg);
}
return socket;
}
std::shared_ptr<DirectConnectionPeer> DirectConnections::connectServer(const Ipv4 &address, PubSubReceiveDataCallback receiveDataCallbackFunc)
{
return connect(address, false, true, receiveDataCallbackFunc);
}
std::shared_ptr<DirectConnectionPeer> DirectConnections::connect(const Ipv4 &address, PubSubReceiveDataCallback receiveDataCallbackFunc)
{
return connect(address, true, true, receiveDataCallbackFunc);
}
std::shared_ptr<DirectConnectionPeer> DirectConnections::connect(const Ipv4 &address, bool rendezvous, bool reuseAddr, PubSubReceiveDataCallback receiveDataCallbackFunc)
{
UDTSOCKET socket = createSocket(Ipv4(nullptr, port), rendezvous, reuseAddr);
if(UDT::connect(socket, (sockaddr*)&address.address, sizeof(address.address)) == UDT::ERROR)
{
UDT::close(socket);
std::string errMsg = "UDT: Failed to connect, error: ";
errMsg += UDT::getlasterror_desc();
throw ConnectionException(errMsg);
}
UDT::epoll_add_usock(eid, socket);
std::shared_ptr<DirectConnectionPeer> peer = std::make_shared<DirectConnectionPeer>();
peer->socket = socket;
peer->address = address;
peer->receiveDataCallbackFunc = receiveDataCallbackFunc;
peersMutex.lock();
peers[socket] = peer;
peersMutex.unlock();
return peer;
}
void DirectConnections::send(const std::shared_ptr<DirectConnectionPeer> &peer, std::shared_ptr<std::vector<u8>> data, PubSubSendDataCallback sendDataCallbackFunc)
{
// TODO: Replace this with light-weight threads (fibers)?
std::thread([peer, data, sendDataCallbackFunc]()
{
usize sentSizeTotal = 0;
while(sentSizeTotal < data->size())
{
int sentSize = UDT::send(peer->socket, (char*)data->data() + sentSizeTotal, data->size() - sentSizeTotal, 0);
if(sentSize == UDT::ERROR)
{
if(sendDataCallbackFunc)
sendDataCallbackFunc(PubSubResult::ERROR, UDT::getlasterror_desc());
}
sentSizeTotal += sentSize;
}
sendDataCallbackFunc(PubSubResult::OK, "");
}).detach();
}
void DirectConnections::receiveData()
{
std::vector<char> data;
data.reserve(MAX_RECEIVED_DATA_SIZE);
std::set<UDTSOCKET> readfds;
while(alive)
{
int numfsReady = UDT::epoll_wait(eid, &readfds, nullptr, 250);
if(numfsReady == 0)
continue;
else if(numfsReady == -1)
{
if(UDT::getlasterror_code() == UDT::ERRORINFO::ETIMEOUT)
continue;
else
{
Log::error("UDT: Stop receiving data, got error: %s", UDT::getlasterror_desc());
return;
}
}
for(UDTSOCKET receivedDataFromPeer : readfds)
{
bool receivedData = receiveDataFromPeer(receivedDataFromPeer, data.data());
if(receivedData)
{
peersMutex.lock();
auto peer = peers[receivedDataFromPeer];
peersMutex.unlock();
try
{
if(peer->receiveDataCallbackFunc)
peer->receiveDataCallbackFunc(peer, data.data(), data.size());
}
catch(std::exception &e)
{
Log::error("UDT: Receive callback function threw exception: %s, ignoring...", e.what());
}
}
}
readfds.clear();
}
}
bool DirectConnections::receiveDataFromPeer(const int socket, char *output)
{
usize receivedTotalSize = 0;
while(receivedTotalSize < MAX_RECEIVED_DATA_SIZE)
{
usize dataAvailableSize;
int receiveSizeDataTypeSize = sizeof(dataAvailableSize);
if(UDT::getsockopt(socket, 0, UDT_RCVDATA, &dataAvailableSize, &receiveSizeDataTypeSize) == UDT::ERROR)
{
Log::error("UDT: Failed to receive data available size, error: %s", UDT::getlasterror_desc());
return false;
}
int receivedSize = UDT::recv(socket, &output[receivedTotalSize], MAX_RECEIVED_DATA_SIZE - receivedTotalSize, 0);
if(receivedSize == UDT::ERROR)
{
Log::error("UDT: Failed to receive data, error: %s", UDT::getlasterror_desc());
return false;
}
if(receivedSize == 0)
{
return true;
}
receivedTotalSize += dataAvailableSize;
}
Log::error("UDT: Received too much data, ignoring...");
return false;
}
}
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