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#include "fastcgiprocess.h"
#include <chrono>
#include <filesystem>
#include <iostream>
#include <string>
#include <thread>
#include <boost/algorithm/string.hpp>
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/beast/websocket/ssl.hpp>
#include <boost/beast/ssl.hpp>
#include <boost/beast/version.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/asio/buffers_iterator.hpp>
#include <boost/asio/connect.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/error.hpp>
#include <boost/asio/ssl/stream.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/asio/local/stream_protocol.hpp>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <libreichwein/file.h>
#include <libreichwein/process.h>
using namespace std::string_literals;
namespace fs = std::filesystem;
namespace pt = boost::property_tree;
using namespace Reichwein;
#define FCGI_LISTENSOCK_FILENO 0
FastCGIProcess::FastCGIProcess(const std::filesystem::path& exe_path, const std::string& host, unsigned short port):
m_pid{},
m_command{exe_path.generic_string()},
m_host{host},
m_port{port}
{
start();
}
FastCGIProcess::FastCGIProcess(const std::filesystem::path& exe_path, const fs::path& socket_path):
m_pid{},
m_command{exe_path.generic_string()},
m_socket_path{socket_path}
{
start();
}
FastCGIProcess::~FastCGIProcess()
{
stop();
}
void run_fcgi_app(const std::string& command, const std::string& host, unsigned short port, int arg, char* argv[])
{
boost::asio::io_context ioc;
boost::asio::ip::tcp::resolver resolver(ioc);
boost::asio::ip::tcp::acceptor acceptor(ioc);
auto const results = resolver.resolve(host.c_str(), std::to_string(port).c_str());
if (results.begin() == results.end())
std::runtime_error("no resolve result");
boost::asio::ip::tcp::endpoint endpoint{*results.begin()};
acceptor.open(endpoint.protocol());
acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
acceptor.bind(endpoint);
acceptor.listen();
int fd{acceptor.native_handle()};
if (fd != FCGI_LISTENSOCK_FILENO) {
close(FCGI_LISTENSOCK_FILENO);
dup2(fd, FCGI_LISTENSOCK_FILENO);
close(fd);
}
execv(command.c_str(), argv);
}
void run_fcgi_app(const std::string& command, const std::filesystem::path& socket_path, int arg, char* argv[])
{
boost::asio::io_context ioc;
boost::asio::local::stream_protocol::acceptor file_acceptor(ioc);
std::error_code ec;
fs::remove(socket_path, ec); // otherwise we get: "bind: Address already in use"
boost::asio::local::stream_protocol::endpoint endpoint(socket_path);
file_acceptor.open(endpoint.protocol());
file_acceptor.set_option(boost::asio::local::stream_protocol::acceptor::reuse_address(true));
file_acceptor.bind(endpoint);
file_acceptor.listen();
int fd {file_acceptor.native_handle()};
if (fd != FCGI_LISTENSOCK_FILENO) {
close(FCGI_LISTENSOCK_FILENO);
dup2(fd, FCGI_LISTENSOCK_FILENO);
close(fd);
}
execv(command.c_str(), argv);
}
void FastCGIProcess::start()
{
if (m_pid != 0)
throw std::runtime_error("Process already running, so it can't be started");
m_pid = fork();
if (m_pid < 0)
throw std::runtime_error("Fork unsuccessful.");
if (m_pid == 0) { // child process branch
char* argv[] {m_command.data(), nullptr};
try {
if (m_socket_path.empty())
run_fcgi_app(m_command, m_host, m_port, 2, argv);
else
run_fcgi_app(m_command, m_socket_path, 2, argv);
} catch (const std::exception& ex) {
std::cout << "FastCGI process error: " << ex.what() << std::endl;
}
exit(0);
}
// wait for server to start up
if (m_socket_path.empty()) { // tcp connection
Process::wait_for_pid_listening_on(m_pid, m_port);
} else { // unix domain socket
Process::wait_for_pid_listening_on(m_pid, m_socket_path);
}
std::this_thread::sleep_for(std::chrono::milliseconds(10));
}
void FastCGIProcess::stop()
{
if (m_pid == 0)
throw std::runtime_error("Process not running, so it can't be stopped");
if (kill(m_pid, SIGTERM) != 0)
throw std::runtime_error("Unable to kill process");
if (int result = waitpid(m_pid, NULL, 0); result != m_pid)
throw std::runtime_error("waitpid returned "s + std::to_string(result));
if (!m_socket_path.empty()) {
std::error_code ec;
fs::remove(m_socket_path, ec);
}
m_pid = 0;
}
bool FastCGIProcess::is_running()
{
if (m_pid == 0)
return false;
return Process::is_running(m_pid);
}
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