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#include "shared/init.hh"
namespace shared {
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));
}
}
static void set_terminate_backtrace() {
std::set_terminate([]() {
try {
throw;
} catch (const std::exception& e) {
shared::print::fault << shared::print::time
<< "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";
for (int i = 0; i < nptrs; ++i) {
shared::print::message << " " << strings[i] << '\n';
}
free(strings); // controversial
} catch (...) {
}
std::exit(EXIT_FAILURE);
});
}
void init() {
GOOGLE_PROTOBUF_VERIFY_VERSION;
set_terminate_backtrace();
set_signal(SIGPIPE, SIG_IGN);
set_signal(SIGINT, []([[maybe_unused]] const int signum) {
shared::print::warn << " interrupt signal received\n";
shared::should_exit = true; // graceful cleanup
});
#ifndef NDEBUG
shared::print::debug << "This binary is a debug build and will be slower "
"and more verbose than usual\n";
#endif
}
void try_main(const main_func_t& func, const std::string_view address,
const std::string_view port) {
try {
func(address, port);
} catch (const std::exception& e) {
shared::print::fault << shared::print::time << "caught exception!\n"
<< " what: " << e.what() << '\n';
}
}
const args_t& get_options() {
static args_t ret{
{.name = "help", .desc = "display this, quit", .val = "h"}};
return ret;
}
bool parse_arg(const int&, const char* const) { return false; }
static std::vector<struct option> make_long_options(const args_t& args) {
std::vector<struct option> options{
option{"help", no_argument, nullptr, 'h'}};
std::transform(std::begin(args), std::end(args),
std::back_inserter(options), [](const auto& arg) {
const auto req = std::string{arg.val}.ends_with(':')
? required_argument
: no_argument;
return option{arg.name, req, nullptr, *arg.val};
});
return options;
}
static std::string make_long_vals(const args_t& args) {
std::string ret{"h"}; // always include help
for (const auto& arg : args) {
ret.append(arg.val);
}
return ret;
}
static auto get_option_it(const auto& options, const decltype(optopt)& c) {
return std::ranges::find_if(options,
[&](const auto& opt) { return c == opt.val; });
}
static void print_help(const args_t& args, const auto& options) {
const auto print_table = [](const auto& val, const int padding) {
std::cout << std::left << std::setw(padding) << std::setfill(' ')
<< val;
};
const int max = static_cast<int>(std::strlen(
std::ranges::max_element(args, [](const auto& a, const auto& b) {
return std::strlen(a.name) < std::strlen(b.name);
})->name));
for (const auto& arg : args) {
const auto it = get_option_it(options, *arg.val);
if (it == std::end(options)) {
continue;
}
std::cout << " ";
print_table(std::string{"--"} + arg.name, 3 + max);
print_table(std::string{"-"} + static_cast<char>(it->val), 3);
std::cout << (it->has_arg == required_argument ? "<arg> " : " ");
std::cout << ": ";
print_table(arg.desc, 10);
std::cout << '\n';
}
}
void parse_args(const int argc, char* const argv[], const args_t& args,
const args_callbacks_t& callbacks) {
const auto long_options = make_long_options(args);
const auto long_vals = make_long_vals(args);
for (int option_index = opterr = 0;;) {
const auto c = getopt_long(argc, argv, long_vals.c_str(),
std::data(long_options), &option_index);
if (c == -1) {
break;
} else if (c == '?') { // parsing error
const auto it = get_option_it(long_options, optopt);
if (it != std::end(long_options)) {
shared::print::fault
<< " bad argument: \"" << it->name << "\" required "
<< (it->has_arg == required_argument ? "an" : "no")
<< " argument\n";
} else {
shared::print::fault << " unknown argument: \""
<< /*TODO get arg <<*/ "\"\n";
}
std::exit(EXIT_FAILURE);
}
if (c == 'h') {
print_help(args, long_options);
std::exit(EXIT_SUCCESS);
}
try {
const char* const arg = optarg + (optarg && optarg[0] == '=');
for (const auto& callback : callbacks) {
if (!callback(c, arg)) {
continue;
}
break;
}
} catch (const boost::bad_lexical_cast& e) {
const auto find_it = get_option_it(long_options, c);
shared::print::fault
<< " bad argument: \""
<< (find_it == std::end(long_options) ? "" : find_it->name)
<< "\" failed type conversion\n";
std::exit(EXIT_FAILURE);
}
}
if (optind < argc) {
shared::print::fault << " unrecognised argument(s):";
for (int i = optind; i < argc; ++i) {
shared::print::fault << std::string{" "} << argv[i];
}
shared::print::fault << '\n';
std::exit(EXIT_FAILURE);
}
}
} // namespace shared
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