File size: 9,823 Bytes
f86fb3b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 | #include "../../include/gateway/tcp_order_gateway.hpp"
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <cerrno>
#include <cstring>
#include <iostream>
namespace quant::gateway {
static bool make_socket_nonblocking(int fd) {
int flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) return false;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK) == 0;
}
static bool tune_hft_tcp_socket(int fd) {
int opt = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
#if defined(SO_REUSEPORT)
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt));
#endif
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
int buf_size = 4 * 1024 * 1024; // 4MB socket buffer
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &buf_size, sizeof(buf_size));
setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &buf_size, sizeof(buf_size));
return make_socket_nonblocking(fd);
}
TCPOrderGateway::TCPOrderGateway(IOReactor& reactor, uint16_t port)
: reactor_(reactor), port_(port) {}
TCPOrderGateway::~TCPOrderGateway() {
stop();
}
bool TCPOrderGateway::start() {
listen_fd_ = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd_ < 0) {
return false;
}
if (!tune_hft_tcp_socket(listen_fd_)) {
close(listen_fd_);
listen_fd_ = -1;
return false;
}
sockaddr_in addr{};
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port_);
if (bind(listen_fd_, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) {
close(listen_fd_);
listen_fd_ = -1;
return false;
}
if (listen(listen_fd_, 1024) < 0) {
close(listen_fd_);
listen_fd_ = -1;
return false;
}
return reactor_.add_socket(
listen_fd_,
IOEvent::READ,
[this](int fd, IOEvent ev) { handle_listen_event(fd, ev); }
);
}
void TCPOrderGateway::stop() {
if (listen_fd_ >= 0) {
reactor_.remove_socket(listen_fd_);
close(listen_fd_);
listen_fd_ = -1;
}
auto client_fds = std::move(sessions_);
for (auto& [fd, session] : client_fds) {
reactor_.remove_socket(fd);
close(fd);
}
sessions_.clear();
client_to_fd_.clear();
}
void TCPOrderGateway::handle_listen_event(int fd, IOEvent events) {
if (!(events & IOEvent::READ)) return;
for (;;) {
sockaddr_in client_addr{};
socklen_t addr_len = sizeof(client_addr);
int client_fd = accept(fd, reinterpret_cast<sockaddr*>(&client_addr), &addr_len);
if (client_fd < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
break; // Drained all incoming connections
}
break;
}
tune_hft_tcp_socket(client_fd);
ClientSession session;
session.fd = client_fd;
session.last_heartbeat_ns = core::TimeUtils::now_ns();
sessions_[client_fd] = std::move(session);
reactor_.add_socket(
client_fd,
IOEvent::READ,
[this](int cfd, IOEvent cev) { handle_client_event(cfd, cev); }
);
}
}
void TCPOrderGateway::handle_client_event(int fd, IOEvent events) {
auto it = sessions_.find(fd);
if (it == sessions_.end()) return;
ClientSession& session = it->second;
if (events & (IOEvent::HANGUP | IOEvent::ERROR)) {
close_client(fd);
return;
}
if (events & IOEvent::READ) {
std::array<uint8_t, 4096> read_chunk;
for (;;) {
ssize_t n = recv(fd, read_chunk.data(), read_chunk.size(), 0);
if (n > 0) {
session.rx_buffer.insert(session.rx_buffer.end(), read_chunk.begin(), read_chunk.begin() + n);
} else if (n == 0) {
close_client(fd);
return;
} else {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
break;
}
close_client(fd);
return;
}
}
process_client_rx(session);
}
if (events & IOEvent::WRITE) {
flush_client_tx(session);
}
}
void TCPOrderGateway::process_client_rx(ClientSession& session) {
size_t offset = 0;
while (session.rx_buffer.size() - offset >= sizeof(protocol::FrameHeader)) {
std::span<const uint8_t> remaining(session.rx_buffer.data() + offset, session.rx_buffer.size() - offset);
auto hdr_opt = protocol::BinaryProtocol::parse_header(remaining);
if (!hdr_opt) {
// Corrupt or desynchronized stream, discard 1 byte and realign
++offset;
continue;
}
const auto& hdr = *hdr_opt;
size_t total_msg_size = sizeof(protocol::FrameHeader) + hdr.body_len;
if (remaining.size() < total_msg_size) {
// Need more data from socket
break;
}
session.last_heartbeat_ns = core::TimeUtils::now_ns();
auto msg_type = static_cast<protocol::MessageType>(hdr.msg_type);
switch (msg_type) {
case protocol::MessageType::NEW_ORDER_SINGLE: {
const auto* payload = protocol::BinaryProtocol::parse_payload<protocol::NewOrderSinglePayload>(remaining);
if (payload) {
session.client_id = payload->client_id;
client_to_fd_[payload->client_id] = session.fd;
if (on_new_order_) {
on_new_order_(*payload, hdr.seq_num, hdr.timestamp_ns);
}
}
break;
}
case protocol::MessageType::ORDER_CANCEL_REQ: {
const auto* payload = protocol::BinaryProtocol::parse_payload<protocol::OrderCancelReqPayload>(remaining);
if (payload) {
session.client_id = payload->client_id;
client_to_fd_[payload->client_id] = session.fd;
if (on_cancel_) {
on_cancel_(*payload, hdr.seq_num, hdr.timestamp_ns);
}
}
break;
}
case protocol::MessageType::HEARTBEAT: {
// Pong heartbeat back
protocol::HeartbeatPayload pong{core::TimeUtils::now_ns()};
std::array<uint8_t, protocol::MAX_FRAME_SIZE> frame;
size_t len = protocol::BinaryProtocol::serialize_message(
std::span<uint8_t>(frame),
protocol::MessageType::HEARTBEAT,
hdr.seq_num,
core::TimeUtils::now_ns(),
pong
);
if (len > 0) {
send_raw(session, frame.data(), len);
}
break;
}
default:
break;
}
offset += total_msg_size;
}
if (offset > 0) {
session.rx_buffer.erase(session.rx_buffer.begin(), session.rx_buffer.begin() + offset);
}
}
bool TCPOrderGateway::send_execution_report(const protocol::ExecutionReportPayload& report, uint64_t seq_num) {
auto it = client_to_fd_.find(report.client_id);
if (it == client_to_fd_.end()) return false;
auto sess_it = sessions_.find(it->second);
if (sess_it == sessions_.end()) return false;
std::array<uint8_t, protocol::MAX_FRAME_SIZE> frame;
size_t len = protocol::BinaryProtocol::serialize_message(
std::span<uint8_t>(frame),
protocol::MessageType::EXECUTION_REPORT,
seq_num,
core::TimeUtils::now_ns(),
report
);
if (len == 0) return false;
return send_raw(sess_it->second, frame.data(), len);
}
bool TCPOrderGateway::send_raw(ClientSession& session, const void* data, size_t len) {
if (session.fd < 0 || len == 0) return false;
const uint8_t* byte_ptr = static_cast<const uint8_t*>(data);
// If there's already pending backpressure data, maintain FIFO order in buffer
if (!session.tx_buffer.empty()) {
session.tx_buffer.insert(session.tx_buffer.end(), byte_ptr, byte_ptr + len);
return true;
}
ssize_t sent = send(session.fd, data, len, 0);
if (sent == static_cast<ssize_t>(len)) {
return true; // Sent completely
}
if (sent < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
sent = 0;
} else {
close_client(session.fd);
return false;
}
}
// Queue unsent remainder and arm reactor for WRITE
session.tx_buffer.insert(session.tx_buffer.end(), byte_ptr + sent, byte_ptr + len);
reactor_.modify_socket(session.fd, IOEvent::READ | IOEvent::WRITE);
return true;
}
void TCPOrderGateway::flush_client_tx(ClientSession& session) {
while (!session.tx_buffer.empty()) {
ssize_t sent = send(session.fd, session.tx_buffer.data(), session.tx_buffer.size(), 0);
if (sent > 0) {
session.tx_buffer.erase(session.tx_buffer.begin(), session.tx_buffer.begin() + sent);
} else if (sent < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
break; // Socket still saturated
} else {
close_client(session.fd);
return;
}
}
// When buffer is drained, remove WRITE event to prevent spinloop
if (session.tx_buffer.empty()) {
reactor_.modify_socket(session.fd, IOEvent::READ);
}
}
void TCPOrderGateway::close_client(int fd) {
reactor_.remove_socket(fd);
close(fd);
auto it = sessions_.find(fd);
if (it != sessions_.end()) {
client_to_fd_.erase(it->second.client_id);
sessions_.erase(it);
}
}
} // namespace quant::gateway
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