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// Standard C++
#include <atomic>
#include <cerrno>
#include <csignal>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <iostream>
#include <sstream>
#include <string>
#include <string_view>
#include <utility>
// FastCGI
#include <fcgiapp.h>
using namespace std;
namespace {
struct Configuration {
int value;
};
atomic_bool quit{ false };
atomic_bool reload{ false };
void
handler(int signal)
{
if ( signal == SIGINT || signal == SIGTERM ) {
quit = true;
}
else if ( signal == SIGHUP ) {
reload = true;
}
}
void
init_signal_handler()
{
struct sigaction sa;
memset(&sa, 0, sizeof sa);
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
signal(SIGPIPE, SIG_IGN);
}
bool
load_configuration(Configuration& configuration)
{
cerr << "Load configuration ...\n";
configuration.value = 1;
return true;
}
void
handle_request(char** env, const Configuration&, string_view body, ostream& out)
{
const char* methode = FCGX_GetParam("REQUEST_METHOD", env);
out << "Content-Type: text/html; charset=utf-8\r\n\r\n";
out << "<h1>Verbindung erfolgreich verarbeitet!</h1>";
out << "<p>Methode: " << (methode ? methode : "?") << ", Body: " << body.size() << " Bytes</p>";
}
void
send_internal_error(const FCGX_Request& request)
{
FCGX_FPrintF(request.out, "Status: 500 Internal Server Error\r\n");
FCGX_FPrintF(request.out, "Content-Type: text/plain; charset=utf-8\r\n\r\n");
FCGX_FPrintF(request.out, "Die Anfrage konnte nicht verarbeitet werden.\n");
}
string
read_request_body(const FCGX_Request& request)
{
string body;
char buffer[8192];
int gelesen;
while ( (gelesen = FCGX_GetStr(buffer, sizeof buffer, request.in)) > 0 ) {
body.append(buffer, gelesen);
}
return body;
}
} // namespace
int
main()
{
FCGX_Init();
auto socket = FCGX_OpenSocket(":5000", 20);
if ( socket == -1 ) {
cerr << "Fehler beim Erstellen des Listen-Sockets...\n";
return EXIT_FAILURE;
}
FCGX_Request request;
if ( FCGX_InitRequest(&request, socket, FCGI_FAIL_ACCEPT_ON_INTR) != 0 ) {
cerr << "Fehler beim Initialisieren...\n";
return EXIT_FAILURE;
}
init_signal_handler();
Configuration configuration{};
if ( !load_configuration(configuration) ) {
cerr << "Die Konfiguration konnte nicht geladen werden.\n";
return EXIT_FAILURE;
}
cout << "Handle Requests...\n";
while ( !quit ) {
if ( reload.exchange(false) ) {
Configuration new_configuration{};
if ( load_configuration(new_configuration) ) {
configuration = std::move(new_configuration);
}
else {
cerr << "Neue Konfiguration nicht lesbar, die bisherige bleibt in Kraft.\n";
}
}
if ( FCGX_Accept_r(&request) < 0 ) {
if ( errno != EINTR ) {
cerr << "Fehler beim Annehmen der Verbindung: " << strerror(errno) << '\n';
break;
}
continue;
}
try {
const string body = read_request_body(request);
ostringstream response;
handle_request(request.envp, configuration, body, response);
const string_view text = response.view();
FCGX_PutStr(text.data(), static_cast<int>(text.size()), request.out);
}
catch ( const exception& e ) {
FCGX_FPrintF(request.err, "Fehler beim Verarbeiten der Anfrage: %s\n", e.what());
send_internal_error(request);
}
FCGX_Finish_r(&request);
}
cout << "shutdown...\n";
}
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