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#include "main.hh"
static void set_signal(const decltype(SIGINT) signal,
void (*const callback)(int)) {
struct sigaction sa {};
sa.sa_handler = callback;
sa.sa_flags = 0;
if (sigaction(signal, &sa, nullptr) == -1) {
throw std::runtime_error("failed to set signal handler for signal " +
std::to_string(signal));
}
}
// Parse arg, store result in dest after casting with boost::lexical_cast.
template <typename T>
static bool maybe_parse_arg(std::vector<std::string_view>& args,
const std::initializer_list<std::string_view>& keys,
T& dest) noexcept {
const auto find_it = std::ranges::find_if(args, [&keys](const auto& arg) {
return std::ranges::find(keys, arg) != std::end(keys);
});
if (find_it == std::end(args)) {
return false;
}
try {
const auto i = static_cast<unsigned int>(find_it - std::begin(args));
dest = boost::lexical_cast<T>(args.at(i + 1u));
} catch (const boost::bad_lexical_cast& e) {
shared::print::fault("bad type conversion for \"" +
std::string{*find_it} + "\" arg\n");
std::exit(EXIT_FAILURE);
} catch (const std::out_of_range& e) {
shared::print::fault("missing \"" + std::string{*find_it} + "\" arg\n");
std::exit(EXIT_FAILURE);
}
args.erase(find_it, std::next(find_it, 2));
return true;
}
// Parse arg, return true or false if arg exists.
static bool
maybe_parse_arg(std::vector<std::string_view>& args,
const std::initializer_list<std::string_view>& keys) noexcept {
const auto find_it = std::ranges::find_if(args, [&keys](const auto& arg) {
return std::ranges::find(keys, arg) != std::end(keys);
});
if (find_it == std::end(args)) {
return false;
}
args.erase(find_it);
return true;
}
static void do_server(const std::string_view address,
const std::string_view port) noexcept {
try {
server::main(address, port);
} catch (const std::exception& e) {
shared::print::fault(std::string{"exception in server!\n"} +
" what: " + e.what() + '\n');
std::exit(EXIT_FAILURE);
}
}
static void do_client(const std::string_view address,
const std::string_view port) noexcept {
try {
client::main(address, port);
} catch (const std::exception& e) {
shared::print::fault(std::string{"exception in client!\n"} +
" what: " + e.what() + '\n');
std::exit(EXIT_FAILURE);
}
}
static void init() noexcept {
// Because we use noexcept liberally, exceptions are often not unwound.
std::set_terminate([]() {
try {
throw;
} catch (const std::exception& e) {
shared::print::fault(std::string{"unhandled exception!\n"} +
" what: " + e.what() + '\n');
constexpr std::size_t BACKTRACE_BUF_SIZE = 64;
std::array<void*, BACKTRACE_BUF_SIZE> bt_buffer{};
const int nptrs =
backtrace(std::data(bt_buffer), std::size(bt_buffer));
char** strings = backtrace_symbols(std::data(bt_buffer), nptrs);
shared::print::message("\n backtrace:\n", false);
for (int i = 0; i < nptrs; ++i) {
shared::print::message(" " + std::string{strings[i]} + '\n',
false);
}
free(strings); // controversial
} catch (...) {
}
std::exit(EXIT_FAILURE);
});
set_signal(SIGPIPE, SIG_IGN);
set_signal(SIGINT, []([[maybe_unused]] const int signum) {
shared::print::warn(" interrupt signal received\n", false);
shared::should_exit = true; // graceful cleanup
});
#ifndef NDEBUG
shared::print::debug(
"This binary is a debug build and should not be used in production.\n",
false);
#endif
}
int main(const int argc, const char* const argv[]) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
// Default argument values, which starts a multiplayer server with a client.
std::string address = "0.0.0.0";
std::string port = "8191";
bool has_address = false;
bool has_headless = false;
{
std::vector<std::string_view> args;
for (auto i = 1; i < argc; ++i) {
args.emplace_back(argv[i]);
}
if (maybe_parse_arg(args, {"--help", "-h"})) {
// clang-format off
std::cout << " --help -h : display this, quit\n"
" --address -a <string> : connect elsewhere\n"
" --port -p <int> : override the default port\n"
" --headless -H : run without a client\n"
" --singleplayer -s : avoid hosting a lan server\n"
" --seed -S <int> : manually set the worldseed\n"
" --directory -d <string> : manually set the directory\n"
" --tickrate -t <int> : override the default tickrate\n"
" --distance -D <int> : set the max chunk distance the server provides\n";
// clang-format on
std::exit(EXIT_SUCCESS);
}
has_address = maybe_parse_arg(args, {"--address", "-a"}, address);
has_headless = maybe_parse_arg(args, {"--headless", "-H"});
maybe_parse_arg(args, {"--port", "-p"}, port);
maybe_parse_arg(args, {"--seed", "-S"}, server::state.seed);
maybe_parse_arg(args, {"--directory", "-d"}, server::state.directory);
maybe_parse_arg(args, {"--tickrate", "-t"}, server::state.tickrate);
maybe_parse_arg(args, {"--distance", "-D"},
server::state.draw_distance);
if (maybe_parse_arg(args, {"--singleplayer", "-s"})) {
if (has_address) {
shared::print::warn("singleplayer argument ignored due "
"to conflicting address argument\n");
}
address = "localhost";
}
std::ranges::for_each(args, [](const auto& arg) {
shared::print::warn("unused argument \"" + std::string{arg} +
"\"\n");
});
}
init();
// Split server/client execution, while waiting for server to boot before
// running the client.
std::jthread server_thread;
if (!has_address) {
if (has_headless) {
do_server(address, port);
std::exit(EXIT_SUCCESS);
}
server_thread = std::jthread{do_server, address, port};
while (!server::has_initialised) {
continue;
}
}
do_client(address, port);
}
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