Boost C++ Libraries

doc/html/boost_asio/example/cpp03/http/server3/server.cpp

//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include "server.hpp"
#include <boost/thread/thread.hpp>
#include <boost/bind/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <vector>

namespace http {
namespace server3 {

server::server(const std::string& address, const std::string& port,
    const std::string& doc_root, std::size_t thread_pool_size)
  : thread_pool_size_(thread_pool_size),
    signals_(io_context_),
    acceptor_(io_context_),
    new_connection_(),
    request_handler_(doc_root)
{
  // Register to handle the signals that indicate when the server should exit.
  // It is safe to register for the same signal multiple times in a program,
  // provided all registration for the specified signal is made through Asio.
  signals_.add(SIGINT);
  signals_.add(SIGTERM);
#if defined(SIGQUIT)
  signals_.add(SIGQUIT);
#endif // defined(SIGQUIT)
  signals_.async_wait(boost::bind(&server::handle_stop, this));

  // Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR).
  boost::asio::ip::tcp::resolver resolver(io_context_);
  boost::asio::ip::tcp::endpoint endpoint =
    *resolver.resolve(address, port).begin();
  acceptor_.open(endpoint.protocol());
  acceptor_.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
  acceptor_.bind(endpoint);
  acceptor_.listen();

  start_accept();
}

void server::run()
{
  // Create a pool of threads to run all of the io_contexts.
  std::vector<boost::shared_ptr<boost::thread> > threads;
  for (std::size_t i = 0; i < thread_pool_size_; ++i)
  {
    boost::shared_ptr<boost::thread> thread(new boost::thread(
          boost::bind(&boost::asio::io_context::run, &io_context_)));
    threads.push_back(thread);
  }

  // Wait for all threads in the pool to exit.
  for (std::size_t i = 0; i < threads.size(); ++i)
    threads[i]->join();
}

void server::start_accept()
{
  new_connection_.reset(new connection(io_context_, request_handler_));
  acceptor_.async_accept(new_connection_->socket(),
      boost::bind(&server::handle_accept, this,
        boost::asio::placeholders::error));
}

void server::handle_accept(const boost::system::error_code& e)
{
  if (!e)
  {
    new_connection_->start();
  }

  start_accept();
}

void server::handle_stop()
{
  io_context_.stop();
}

} // namespace server3
} // namespace http