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PolyGun/src/server/server.cpp

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/*
PolyGun
Copyright (c) 2023 mrkubax10 <mrkubax10@onet.pl>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "server/server.hpp"
#include <cstring>
#include <iostream>
#include <csignal>
#include <algorithm>
#include <config.hpp>
#if defined(__unix__)
#include <sys/ioctl.h>
#endif
#if defined(__FreeBSD__)
#include <sys/socket.h>
#endif
#include "common/math/rect3d.hpp"
#include "common/logger.hpp"
#include "common/world/chunk.hpp"
#include "server/as/ast.hpp"
#include "server/as/vm.hpp"
using namespace polygun::server;
static const float DAY_TIME_INTERVAL = 10.0f*60.0f/65536.0f;
static Server* g_current_server = nullptr;
as::Value test_native_function(as::VM& vm, const std::vector<as::Value>& args) {
LOG_INFO("%d", args[0].i);
return as::Value{};
}
Server::Server(std::atomic<bool>* running_atomic, std::optional<unsigned short> port_override) :
m_config(),
m_running(running_atomic?running_atomic:new std::atomic<bool>),
m_running_atomic_created(!running_atomic),
m_clients(),
m_clients_mutex(),
m_latest_client(),
m_server_socket(new polygun::network::UDPSocket),
m_command_thread(),
m_update_thread(),
m_day_time(15000),
m_mod_manager(*this),
m_chunk_manager(*this),
m_command_parser(*this),
m_player_storage(*this)
{
LOG_INFO("Starting server");
m_server_socket->bind(port_override.value_or(m_config.m_port));
if(m_running_atomic_created) {
m_running->store(true);
g_current_server = this;
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);
#if defined(__unix__)
signal(SIGQUIT, signal_handler);
signal(SIGSTOP, signal_handler);
#endif
m_command_thread.reset(new std::thread(&Server::command_thread_func, this));
}
m_player_storage.load();
m_chunk_manager.load_map_from_file(m_config.m_default_map);
m_mod_manager.enumerate_modules();
as::Value val1;
val1.i = 10;
as::Value val2;
val2.i = 5;
as::VM vm(1024);
vm.register_function("test_native_function", as::VarType::VAR_TYPE_VOID, std::vector<as::VarType>{as::VarType::VAR_TYPE_INT32}, test_native_function);
std::unique_ptr<as::StatementBlock> block = std::make_unique<as::StatementBlock>();
std::vector<std::unique_ptr<as::Expression>> arguments;
arguments.push_back(std::make_unique<as::BinaryExpression>(as::BinaryExpression::Operation::OPERATION_MUL, std::make_unique<as::NumericExpression>(val1, as::ValueType::VALUE_TYPE_INT), std::make_unique<as::NumericExpression>(val2, as::ValueType::VALUE_TYPE_INT)));
block->add_expression(std::make_unique<as::FunctionCall>(vm, as::FunctionType::FUNCTION_NATIVE, 0, std::move(arguments)));
block->eval(vm);
}
Server::~Server() {
LOG_INFO("Shutting down server");
LOG_VERBOSE("Waiting for update thread to finish");
if(m_update_thread->joinable())
m_update_thread->join();
if(m_running_atomic_created) {
LOG_VERBOSE("Waiting for command thread to finish");
if(m_command_thread->joinable())
m_command_thread->join();
delete m_running;
}
m_player_storage.save();
}
void Server::run() {
m_mod_manager.run_modules();
m_running->store(true);
m_update_thread.reset(new std::thread(&Server::update_thread_func, this));
polygun::network::NetworkPacket packet;
while(m_running->load()) {
bool handled = false;
polygun::network::NetworkEndpoint sender;
memset((void*)&sender, 0, sizeof(sender));
m_clients_mutex.lock();
for(size_t i = 0; i<m_clients.size(); i++) {
m_clients[i]->get_connection().update();
if(time(0)-m_clients[i]->get_last_activity()>=10) {
handle_player_timeout(m_clients[i].get());
m_clients.erase(m_clients.begin()+i);
i--;
}
}
m_clients_mutex.unlock();
if(!m_server_socket->recv(packet, &sender))
continue;
m_clients_mutex.lock();
for(size_t i = 0; i<m_clients.size(); i++) {
Client& client = *m_clients[i];
if(memcmp(&sender, &client.get_connection().get_endpoint(), sizeof(polygun::network::NetworkEndpoint))==0) {
if(client.get_join_completed() && packet.get_id()==polygun::network::NetworkPacketID::PACKET_HANDSHAKE) {
LOG_WARNING("Player %s(%d) has resent handshake packet!!", client.get_nick().c_str(), client.get_uuid());
handled = true;
}
else if((packet.get_flags() & polygun::network::NetworkPacketFlag::FLAG_RELIABLE) || packet.get_id()==polygun::network::NetworkPacketID::PACKET_ACK)
client.get_connection().push_packet(packet);
else if(!handle_packet(packet, &client)) {
handle_player_disconnected(&client);
m_clients.erase(m_clients.begin()+i);
i--;
}
handled = true;
}
if(client.get_connection().recv_packet(packet)) {
if(!handle_packet(packet, &client)) {
m_clients.erase(m_clients.begin()+i);
i--;
}
}
}
m_clients_mutex.unlock();
if(!handled && packet.get_id()==polygun::network::NetworkPacketID::PACKET_HANDSHAKE) {
std::unique_ptr<polygun::network::NetworkManager> network_manager = std::make_unique<polygun::network::NetworkManager>(m_server_socket, sender);
network_manager->increment_incoming_packet_counter();
m_latest_client.reset(new Client(std::move(network_manager)));
if(handle_new_player(packet)) {
LOG_INFO("Player %s joined the game (uuid: %d)", m_latest_client->get_nick().c_str(), m_latest_client->get_uuid());
m_clients_mutex.lock();
m_clients.push_back(std::move(m_latest_client));
m_clients_mutex.unlock();
}
}
m_chunk_manager.update();
}
for(std::unique_ptr<Client>& client : m_clients) {
network::NetworkPacket packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_NONE, network::NetworkPacketID::PACKET_TO_CLIENT_SERVER_EXIT);
client->get_connection().send_packet(packet);
}
}
void Server::register_node(const world::NodeDef& def) {
m_node_defs[def.m_string_id] = def;
m_node_defs[def.m_string_id].m_id = m_mod_manager.get_next_node_id();
}
void Server::notify_map_invalidation() {
for(std::unique_ptr<Client>& client : m_clients) {
network::NetworkPacket packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_INVALIDATE_MAP);
client->get_connection().send_packet(packet);
}
}
Client* Server::get_client_by_nick(const std::string& nick) {
for(std::unique_ptr<Client>& client : m_clients) {
if(client->get_nick()==nick)
return client.get();
}
return nullptr;
}
void Server::command_thread_func() {
std::string line;
bool has_input_data = false;
bool show_input_prompt = true;
while(m_running->load()) {
if(show_input_prompt) {
std::cout<<"> ";
std::cout.flush();
show_input_prompt = false;
}
#if defined(__unix__)
int byte_count = 0;
ioctl(0, FIONREAD, &byte_count);
if(byte_count>0) {
has_input_data = true;
getline(std::cin, line);
}
#elif defined(_WIN32)
// FIXME: Support Unicode characters there
// Note: this code is very hacky but it works
HANDLE stdin_handle = GetStdHandle(STD_INPUT_HANDLE);
INPUT_RECORD records[4];
DWORD record_count;
ReadConsoleInput(stdin_handle, records, sizeof(records)/sizeof(INPUT_RECORD), &record_count);
for(DWORD i = 0; i<record_count; i++) {
if(records[i].EventType==KEY_EVENT && records[i].Event.KeyEvent.bKeyDown) {
CHAR ch = records[i].Event.KeyEvent.uChar.AsciiChar;
if(isprint(ch)) {
line+=ch;
std::cout<<ch;
std::cout.flush();
}
else if(ch==8 && !line.empty()) {
line.back()=' ';
std::cout<<"\r> "<<line;
line.pop_back();
std::cout<<"\r> "<<line;
}
else if(ch==13) {
std::cout<<std::endl;
has_input_data = true;
break;
}
}
}
#endif
if(has_input_data) {
m_command_parser.parse(line);
has_input_data = false;
show_input_prompt = true;
#if defined(_WIN32)
line.clear();
#endif
}
}
}
void Server::update_thread_func() {
std::chrono::time_point<std::chrono::steady_clock> prev_time = std::chrono::steady_clock::now();
float since_day_time_update = 0.0f;
while(m_running->load()) {
const std::chrono::time_point<std::chrono::steady_clock> tm = std::chrono::steady_clock::now();
const std::chrono::duration<float> interval = tm-prev_time;
prev_time = tm;
since_day_time_update+=interval.count();
const uint16_t to_add = since_day_time_update/DAY_TIME_INTERVAL;
if(to_add==0)
continue;
m_day_time+=to_add;
since_day_time_update-=to_add*DAY_TIME_INTERVAL;
}
}
bool Server::handle_packet(polygun::network::NetworkPacket& packet, Client* client) {
switch(packet.get_id()) {
case polygun::network::NetworkPacketID::PACKET_HANDSHAKE:
return handle_new_player(packet);
case polygun::network::NetworkPacketID::PACKET_POSITION:
handle_position(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_ROTATE:
handle_player_rotate(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_MESSAGE:
handle_player_message(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_CHUNK:
handle_chunk_request(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_NODE_CHANGE:
handle_node_change(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_NODE_FILL:
handle_node_fill(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_SYNC:
handle_sync(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_NODE_DEFINITION:
handle_node_definition(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_RESOURCE:
handle_resource_request(packet, client);
return true;
case polygun::network::NetworkPacketID::PACKET_EXIT:
handle_player_disconnected(client);
break;
case polygun::network::NetworkPacketID::PACKET_ACTIVITY:
handle_player_activity(client);
return true;
}
return false;
}
bool Server::handle_new_player(polygun::network::NetworkPacket& packet) {
std::string nick;
packet.read(nick);
m_latest_client->set_nick(nick);
// Generate UUID
bool unique = true;
uint32_t uuid;
// FIXME: there is possible hang here
do{
uuid = rand();
for(const std::unique_ptr<Client>& client : m_clients)
unique = uuid != client->get_uuid();
}
while(!unique);
m_latest_client->get_connection().send_ack(packet.get_num());
polygun::network::NetworkPacket out_packet = m_latest_client->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_RELIABLE, polygun::network::NetworkPacketID::PACKET_HANDSHAKE);
out_packet.write(uuid);
out_packet.write(m_mod_manager.get_current_node_id());
out_packet.write(static_cast<uint8_t>(m_config.m_default_player_mode));
out_packet.write(m_day_time);
m_latest_client->get_connection().send_packet(out_packet);
m_latest_client->set_uuid(uuid);
m_latest_client->set_mode(m_config.m_default_player_mode);
m_latest_client->set_join_completed_flag();
if(!m_clients.empty()) {
out_packet = m_latest_client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_TO_CLIENT_PLAYER_INFO);
out_packet.write(static_cast<uint8_t>(m_clients.size()));
for(const std::unique_ptr<Client>& client : m_clients)
out_packet.write(client.get());
m_latest_client->get_connection().send_packet(out_packet);
}
for(std::unique_ptr<Client>& client : m_clients) {
out_packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_TO_CLIENT_PLAYER_JOIN);
out_packet.write(uuid);
out_packet.write(nick);
client->get_connection().send_packet(out_packet);
}
return true;
}
void Server::handle_position(polygun::network::NetworkPacket& packet, Client* client) {
math::Vector3f pos;
if(!packet.read(pos)) {
LOG_ERROR("Player %s(%d) sent invalid position packet", client->get_nick().c_str(), client->get_uuid());
return;
}
client->set_position(pos);
for(std::unique_ptr<Client>& c : m_clients) {
if(c->get_uuid()==client->get_uuid())
continue;
network::NetworkPacket out_packet = c->get_connection().create_packet(network::NetworkPacketFlag::FLAG_NONE, packet.get_id());
out_packet.write(client->get_uuid());
out_packet.write(pos);
c->get_connection().send_packet(out_packet);
}
}
void Server::handle_player_rotate(polygun::network::NetworkPacket& packet, Client* client) {
float rot;
if(!packet.read(rot)) {
LOG_ERROR("Player %s(%d) sent invalid rotation packet", client->get_nick().c_str(), client->get_uuid());
return;
}
client->set_rotation(rot);
for(std::unique_ptr<Client>& c : m_clients) {
if(c->get_uuid()==client->get_uuid())
continue;
network::NetworkPacket out_packet = c->get_connection().create_packet(network::NetworkPacketFlag::FLAG_NONE, packet.get_id());
out_packet.write(client->get_uuid());
out_packet.write(rot);
c->get_connection().send_packet(out_packet);
}
}
void Server::handle_player_message(polygun::network::NetworkPacket& packet, Client* client) {
std::string message;
if(!packet.read(message)) {
LOG_ERROR("Player %s(%d) sent invalid message packet", client->get_nick().c_str(), client->get_uuid());
return;
}
if(message.empty())
return;
LOG_INFO("Message: <%s> %s", client->get_nick().c_str(), message.c_str());
if(message[0]=='/') {
m_command_parser.parse(message.substr(1, message.length()-1), client);
return;
}
for(std::unique_ptr<Client>& c : m_clients) {
network::NetworkPacket out_packet = c->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, packet.get_id());
out_packet.write(static_cast<uint8_t>(0)); // regular player message
out_packet.write(client->get_nick());
out_packet.write(message);
c->get_connection().send_packet(out_packet);
}
}
void Server::handle_chunk_request(polygun::network::NetworkPacket& packet, Client* client) {
math::Vector3i pos;
packet.read(pos);
network::NetworkPacket out_packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_CHUNK);
out_packet.write(pos);
const math::Rect3D chunk_rect(pos.convert<float>(), math::Vector3f(world::Chunk::CHUNK_SIZE));
const math::Rect3D player_view_rect = math::Rect3D::with_center(client->get_position()/math::Vector3f(world::Chunk::CHUNK_SIZE), math::Vector3f(5));
if(player_view_rect.overlaps(chunk_rect)) {
const world::Chunk* const chunk = m_chunk_manager.get_chunk(pos);
out_packet.write(chunk);
}
else {
// Note: Maybe warn player for possible cheating/ddosing server with chunk requests outside of viewing range
world::Chunk dummy_chunk;
dummy_chunk.fill(1);
out_packet.write(&dummy_chunk);
}
client->get_connection().send_packet(out_packet);
}
void Server::handle_node_change(polygun::network::NetworkPacket& packet, Client* client) {
if(client->get_mode()!=world::PlayerMode::PLAYER_MODE_EDITMODE)
return;
math::Vector3i pos;
uint16_t node;
packet.read(pos);
packet.read(node);
m_chunk_manager.add_node(node, pos);
for(std::unique_ptr<Client>& c : m_clients) {
polygun::network::NetworkPacket packet = c->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_RELIABLE, polygun::network::NetworkPacketID::PACKET_NODE_CHANGE);
packet.write(pos);
packet.write(node);
c->get_connection().send_packet(packet);
}
}
void Server::handle_node_fill(polygun::network::NetworkPacket& packet, Client* client) {
if(client->get_mode()!=world::PlayerMode::PLAYER_MODE_EDITMODE)
return;
math::Vector3i from;
math::Vector3i to;
uint16_t node;
packet.read(from);
packet.read(to);
packet.read(node);
m_chunk_manager.fill_node(node, from, to);
for(std::unique_ptr<Client>& c : m_clients) {
polygun::network::NetworkPacket packet = c->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_RELIABLE, polygun::network::NetworkPacketID::PACKET_NODE_FILL);
packet.write(from);
packet.write(to);
packet.write(node);
c->get_connection().send_packet(packet);
}
}
void Server::handle_sync(polygun::network::NetworkPacket& packet, Client* client) {
network::NetworkPacket out_packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_SYNC);
out_packet.write(m_day_time);
client->get_connection().send_packet(out_packet);
}
void Server::handle_node_definition(polygun::network::NetworkPacket& packet, Client* client) {
uint16_t node_id;
if(!packet.read(node_id)) {
LOG_ERROR("Player %s(%d) sent invalid node definition request", client->get_nick().c_str(), client->get_uuid());
return;
}
network::NetworkPacket out_packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_NODE_DEFINITION);
std::map<std::string, world::NodeDef>::iterator it = std::find_if(m_node_defs.begin(), m_node_defs.end(), [node_id](const std::pair<std::string, world::NodeDef>& element) {
return element.second.m_id==node_id;
});
out_packet.write(node_id);
if(it==m_node_defs.end()) {
world::NodeDef unknown_node;
unknown_node.m_string_id = "builtin:unknown";
out_packet.write(&unknown_node);
}
else
out_packet.write(&it->second);
client->get_connection().send_packet(out_packet);
}
void Server::handle_resource_request(polygun::network::NetworkPacket& packet, Client* client) {
std::string resource_id;
if(!packet.read(resource_id)) {
LOG_ERROR("Player %s(%d) sent invalid resource request", client->get_nick().c_str(), client->get_uuid());
return;
}
std::vector<uint8_t> resource_data;
if(!m_mod_manager.load_mod_resource(resource_id, resource_data)) {
send_empty_resource(client, resource_id);
return;
}
network::NetworkPacket p = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_RESOURCE);
p.write(resource_id);
p.write(resource_data);
client->get_connection().send_packet(p);
}
void Server::handle_player_disconnected(const Client* client) {
LOG_INFO("Player %s(%d) left the game", client->get_nick().c_str(), client->get_uuid());
for(std::unique_ptr<Client>& c : m_clients) {
if(c->get_uuid()==client->get_uuid())
continue;
polygun::network::NetworkPacket packet = c->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_RELIABLE, polygun::network::NetworkPacketID::PACKET_EXIT);
packet.write(client->get_uuid()); // client UUID
packet.write((uint8_t)0); // reason ID
c->get_connection().send_packet(packet);
}
}
void Server::handle_player_timeout(const Client* client) {
LOG_INFO("Player %s(%d) has left the game: timeout", client->get_nick().c_str(), client->get_uuid());
for(std::unique_ptr<Client>& c : m_clients) {
if(c->get_uuid()==client->get_uuid())
continue;
polygun::network::NetworkPacket packet = c->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_RELIABLE, polygun::network::NetworkPacketID::PACKET_EXIT);
packet.write(client->get_uuid()); // client UUID
packet.write((uint8_t)1); // reason ID
c->get_connection().send_packet(packet);
}
}
void Server::handle_player_activity(Client* client) {
client->update_activity();
network::NetworkPacket packet = client->get_connection().create_packet(polygun::network::NetworkPacketFlag::FLAG_NONE, polygun::network::NetworkPacketID::PACKET_ACTIVITY);
client->get_connection().send_packet(packet);
}
void Server::send_empty_resource(Client* client, const std::string& resource_id) {
network::NetworkPacket packet = client->get_connection().create_packet(network::NetworkPacketFlag::FLAG_RELIABLE, network::NetworkPacketID::PACKET_RESOURCE);
packet.write(resource_id);
packet.write(static_cast<uint16_t>(0));
client->get_connection().send_packet(packet);
}
#if !defined(HAVE_STRSIGNAL)
static const char* strsignal(int sig) {
switch(sig){
case SIGINT:
return "Interrupt";
case SIGTERM:
return "Terminated";
}
return nullptr;
}
#endif
void Server::signal_handler(int sig) {
if(!g_current_server)
return;
const char* signal_name = strsignal(sig);
if(!signal_name)
signal_name = "Unknown";
LOG_INFO("Received %s signal", signal_name);
g_current_server->m_running->store(false);
}
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