[DEV] add v1.76.0

doc/html/boost_asio/example/cpp03/http/server2/connection.cpp

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+//
+// connection.cpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 "connection.hpp"
+#include <vector>
+#include <boost/bind/bind.hpp>
+#include "request_handler.hpp"
+
+namespace http {
+namespace server2 {
+
+connection::connection(boost::asio::io_context& io_context,
+    request_handler& handler)
+  : socket_(io_context),
+    request_handler_(handler)
+{
+}
+
+boost::asio::ip::tcp::socket& connection::socket()
+{
+  return socket_;
+}
+
+void connection::start()
+{
+  socket_.async_read_some(boost::asio::buffer(buffer_),
+      boost::bind(&connection::handle_read, shared_from_this(),
+        boost::asio::placeholders::error,
+        boost::asio::placeholders::bytes_transferred));
+}
+
+void connection::handle_read(const boost::system::error_code& e,
+    std::size_t bytes_transferred)
+{
+  if (!e)
+  {
+    boost::tribool result;
+    boost::tie(result, boost::tuples::ignore) = request_parser_.parse(
+        request_, buffer_.data(), buffer_.data() + bytes_transferred);
+
+    if (result)
+    {
+      request_handler_.handle_request(request_, reply_);
+      boost::asio::async_write(socket_, reply_.to_buffers(),
+          boost::bind(&connection::handle_write, shared_from_this(),
+            boost::asio::placeholders::error));
+    }
+    else if (!result)
+    {
+      reply_ = reply::stock_reply(reply::bad_request);
+      boost::asio::async_write(socket_, reply_.to_buffers(),
+          boost::bind(&connection::handle_write, shared_from_this(),
+            boost::asio::placeholders::error));
+    }
+    else
+    {
+      socket_.async_read_some(boost::asio::buffer(buffer_),
+          boost::bind(&connection::handle_read, shared_from_this(),
+            boost::asio::placeholders::error,
+            boost::asio::placeholders::bytes_transferred));
+    }
+  }
+
+  // If an error occurs then no new asynchronous operations are started. This
+  // means that all shared_ptr references to the connection object will
+  // disappear and the object will be destroyed automatically after this
+  // handler returns. The connection class's destructor closes the socket.
+}
+
+void connection::handle_write(const boost::system::error_code& e)
+{
+  if (!e)
+  {
+    // Initiate graceful connection closure.
+    boost::system::error_code ignored_ec;
+    socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
+  }
+
+  // No new asynchronous operations are started. This means that all shared_ptr
+  // references to the connection object will disappear and the object will be
+  // destroyed automatically after this handler returns. The connection class's
+  // destructor closes the socket.
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/connection.hpp

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+//
+// connection.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_CONNECTION_HPP
+#define HTTP_SERVER2_CONNECTION_HPP
+
+#include <boost/asio.hpp>
+#include <boost/array.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include "reply.hpp"
+#include "request.hpp"
+#include "request_handler.hpp"
+#include "request_parser.hpp"
+
+namespace http {
+namespace server2 {
+
+/// Represents a single connection from a client.
+class connection
+  : public boost::enable_shared_from_this<connection>,
+    private boost::noncopyable
+{
+public:
+  /// Construct a connection with the given io_context.
+  explicit connection(boost::asio::io_context& io_context,
+      request_handler& handler);
+
+  /// Get the socket associated with the connection.
+  boost::asio::ip::tcp::socket& socket();
+
+  /// Start the first asynchronous operation for the connection.
+  void start();
+
+private:
+  /// Handle completion of a read operation.
+  void handle_read(const boost::system::error_code& e,
+      std::size_t bytes_transferred);
+
+  /// Handle completion of a write operation.
+  void handle_write(const boost::system::error_code& e);
+
+  /// Socket for the connection.
+  boost::asio::ip::tcp::socket socket_;
+
+  /// The handler used to process the incoming request.
+  request_handler& request_handler_;
+
+  /// Buffer for incoming data.
+  boost::array<char, 8192> buffer_;
+
+  /// The incoming request.
+  request request_;
+
+  /// The parser for the incoming request.
+  request_parser request_parser_;
+
+  /// The reply to be sent back to the client.
+  reply reply_;
+};
+
+typedef boost::shared_ptr<connection> connection_ptr;
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_CONNECTION_HPP

doc/html/boost_asio/example/cpp03/http/server2/header.hpp

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+//
+// header.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_HEADER_HPP
+#define HTTP_SERVER2_HEADER_HPP
+
+#include <string>
+
+namespace http {
+namespace server2 {
+
+struct header
+{
+  std::string name;
+  std::string value;
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_HEADER_HPP

doc/html/boost_asio/example/cpp03/http/server2/io_context_pool.cpp

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+//
+// io_context_pool.cpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 <stdexcept>
+#include <boost/thread/thread.hpp>
+#include <boost/bind/bind.hpp>
+#include <boost/shared_ptr.hpp>
+
+namespace http {
+namespace server2 {
+
+io_context_pool::io_context_pool(std::size_t pool_size)
+  : next_io_context_(0)
+{
+  if (pool_size == 0)
+    throw std::runtime_error("io_context_pool size is 0");
+
+  // Give all the io_contexts work to do so that their run() functions will not
+  // exit until they are explicitly stopped.
+  for (std::size_t i = 0; i < pool_size; ++i)
+  {
+    io_context_ptr io_context(new boost::asio::io_context);
+    io_contexts_.push_back(io_context);
+    work_.push_back(boost::asio::require(io_context->get_executor(),
+          boost::asio::execution::outstanding_work.tracked));
+  }
+}
+
+void io_context_pool::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 < io_contexts_.size(); ++i)
+  {
+    boost::shared_ptr<boost::thread> thread(new boost::thread(
+          boost::bind(&boost::asio::io_context::run, io_contexts_[i])));
+    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 io_context_pool::stop()
+{
+  // Explicitly stop all io_contexts.
+  for (std::size_t i = 0; i < io_contexts_.size(); ++i)
+    io_contexts_[i]->stop();
+}
+
+boost::asio::io_context& io_context_pool::get_io_context()
+{
+  // Use a round-robin scheme to choose the next io_context to use.
+  boost::asio::io_context& io_context = *io_contexts_[next_io_context_];
+  ++next_io_context_;
+  if (next_io_context_ == io_contexts_.size())
+    next_io_context_ = 0;
+  return io_context;
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/io_context_pool.hpp

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+//
+// io_context_pool.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_IO_SERVICE_POOL_HPP
+#define HTTP_SERVER2_IO_SERVICE_POOL_HPP
+
+#include <boost/asio.hpp>
+#include <list>
+#include <vector>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+
+namespace http {
+namespace server2 {
+
+/// A pool of io_context objects.
+class io_context_pool
+  : private boost::noncopyable
+{
+public:
+  /// Construct the io_context pool.
+  explicit io_context_pool(std::size_t pool_size);
+
+  /// Run all io_context objects in the pool.
+  void run();
+
+  /// Stop all io_context objects in the pool.
+  void stop();
+
+  /// Get an io_context to use.
+  boost::asio::io_context& get_io_context();
+
+private:
+  typedef boost::shared_ptr<boost::asio::io_context> io_context_ptr;
+
+  /// The pool of io_contexts.
+  std::vector<io_context_ptr> io_contexts_;
+
+  /// The work-tracking executors that keep the io_contexts running.
+  std::list<boost::asio::any_io_executor> work_;
+
+  /// The next io_context to use for a connection.
+  std::size_t next_io_context_;
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_IO_SERVICE_POOL_HPP

doc/html/boost_asio/example/cpp03/http/server2/main.cpp

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+//
+// main.cpp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 <iostream>
+#include <string>
+#include <boost/asio.hpp>
+#include <boost/bind/bind.hpp>
+#include <boost/lexical_cast.hpp>
+#include "server.hpp"
+
+int main(int argc, char* argv[])
+{
+  try
+  {
+    // Check command line arguments.
+    if (argc != 5)
+    {
+      std::cerr << "Usage: http_server <address> <port> <threads> <doc_root>\n";
+      std::cerr << "  For IPv4, try:\n";
+      std::cerr << "    receiver 0.0.0.0 80 1 .\n";
+      std::cerr << "  For IPv6, try:\n";
+      std::cerr << "    receiver 0::0 80 1 .\n";
+      return 1;
+    }
+
+    // Initialise the server.
+    std::size_t num_threads = boost::lexical_cast<std::size_t>(argv[3]);
+    http::server2::server s(argv[1], argv[2], argv[4], num_threads);
+
+    // Run the server until stopped.
+    s.run();
+  }
+  catch (std::exception& e)
+  {
+    std::cerr << "exception: " << e.what() << "\n";
+  }
+
+  return 0;
+}

doc/html/boost_asio/example/cpp03/http/server2/mime_types.cpp

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+//
+// mime_types.cpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 "mime_types.hpp"
+
+namespace http {
+namespace server2 {
+namespace mime_types {
+
+struct mapping
+{
+  const char* extension;
+  const char* mime_type;
+} mappings[] =
+{
+  { "gif", "image/gif" },
+  { "htm", "text/html" },
+  { "html", "text/html" },
+  { "jpg", "image/jpeg" },
+  { "png", "image/png" },
+  { 0, 0 } // Marks end of list.
+};
+
+std::string extension_to_type(const std::string& extension)
+{
+  for (mapping* m = mappings; m->extension; ++m)
+  {
+    if (m->extension == extension)
+    {
+      return m->mime_type;
+    }
+  }
+
+  return "text/plain";
+}
+
+} // namespace mime_types
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/mime_types.hpp

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+//
+// mime_types.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_MIME_TYPES_HPP
+#define HTTP_SERVER2_MIME_TYPES_HPP
+
+#include <string>
+
+namespace http {
+namespace server2 {
+namespace mime_types {
+
+/// Convert a file extension into a MIME type.
+std::string extension_to_type(const std::string& extension);
+
+} // namespace mime_types
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_MIME_TYPES_HPP

doc/html/boost_asio/example/cpp03/http/server2/reply.cpp

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+//
+// reply.cpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 "reply.hpp"
+#include <string>
+#include <boost/lexical_cast.hpp>
+
+namespace http {
+namespace server2 {
+
+namespace status_strings {
+
+const std::string ok =
+  "HTTP/1.0 200 OK\r\n";
+const std::string created =
+  "HTTP/1.0 201 Created\r\n";
+const std::string accepted =
+  "HTTP/1.0 202 Accepted\r\n";
+const std::string no_content =
+  "HTTP/1.0 204 No Content\r\n";
+const std::string multiple_choices =
+  "HTTP/1.0 300 Multiple Choices\r\n";
+const std::string moved_permanently =
+  "HTTP/1.0 301 Moved Permanently\r\n";
+const std::string moved_temporarily =
+  "HTTP/1.0 302 Moved Temporarily\r\n";
+const std::string not_modified =
+  "HTTP/1.0 304 Not Modified\r\n";
+const std::string bad_request =
+  "HTTP/1.0 400 Bad Request\r\n";
+const std::string unauthorized =
+  "HTTP/1.0 401 Unauthorized\r\n";
+const std::string forbidden =
+  "HTTP/1.0 403 Forbidden\r\n";
+const std::string not_found =
+  "HTTP/1.0 404 Not Found\r\n";
+const std::string internal_server_error =
+  "HTTP/1.0 500 Internal Server Error\r\n";
+const std::string not_implemented =
+  "HTTP/1.0 501 Not Implemented\r\n";
+const std::string bad_gateway =
+  "HTTP/1.0 502 Bad Gateway\r\n";
+const std::string service_unavailable =
+  "HTTP/1.0 503 Service Unavailable\r\n";
+
+boost::asio::const_buffer to_buffer(reply::status_type status)
+{
+  switch (status)
+  {
+  case reply::ok:
+    return boost::asio::buffer(ok);
+  case reply::created:
+    return boost::asio::buffer(created);
+  case reply::accepted:
+    return boost::asio::buffer(accepted);
+  case reply::no_content:
+    return boost::asio::buffer(no_content);
+  case reply::multiple_choices:
+    return boost::asio::buffer(multiple_choices);
+  case reply::moved_permanently:
+    return boost::asio::buffer(moved_permanently);
+  case reply::moved_temporarily:
+    return boost::asio::buffer(moved_temporarily);
+  case reply::not_modified:
+    return boost::asio::buffer(not_modified);
+  case reply::bad_request:
+    return boost::asio::buffer(bad_request);
+  case reply::unauthorized:
+    return boost::asio::buffer(unauthorized);
+  case reply::forbidden:
+    return boost::asio::buffer(forbidden);
+  case reply::not_found:
+    return boost::asio::buffer(not_found);
+  case reply::internal_server_error:
+    return boost::asio::buffer(internal_server_error);
+  case reply::not_implemented:
+    return boost::asio::buffer(not_implemented);
+  case reply::bad_gateway:
+    return boost::asio::buffer(bad_gateway);
+  case reply::service_unavailable:
+    return boost::asio::buffer(service_unavailable);
+  default:
+    return boost::asio::buffer(internal_server_error);
+  }
+}
+
+} // namespace status_strings
+
+namespace misc_strings {
+
+const char name_value_separator[] = { ':', ' ' };
+const char crlf[] = { '\r', '\n' };
+
+} // namespace misc_strings
+
+std::vector<boost::asio::const_buffer> reply::to_buffers()
+{
+  std::vector<boost::asio::const_buffer> buffers;
+  buffers.push_back(status_strings::to_buffer(status));
+  for (std::size_t i = 0; i < headers.size(); ++i)
+  {
+    header& h = headers[i];
+    buffers.push_back(boost::asio::buffer(h.name));
+    buffers.push_back(boost::asio::buffer(misc_strings::name_value_separator));
+    buffers.push_back(boost::asio::buffer(h.value));
+    buffers.push_back(boost::asio::buffer(misc_strings::crlf));
+  }
+  buffers.push_back(boost::asio::buffer(misc_strings::crlf));
+  buffers.push_back(boost::asio::buffer(content));
+  return buffers;
+}
+
+namespace stock_replies {
+
+const char ok[] = "";
+const char created[] =
+  "<html>"
+  "<head><title>Created</title></head>"
+  "<body><h1>201 Created</h1></body>"
+  "</html>";
+const char accepted[] =
+  "<html>"
+  "<head><title>Accepted</title></head>"
+  "<body><h1>202 Accepted</h1></body>"
+  "</html>";
+const char no_content[] =
+  "<html>"
+  "<head><title>No Content</title></head>"
+  "<body><h1>204 Content</h1></body>"
+  "</html>";
+const char multiple_choices[] =
+  "<html>"
+  "<head><title>Multiple Choices</title></head>"
+  "<body><h1>300 Multiple Choices</h1></body>"
+  "</html>";
+const char moved_permanently[] =
+  "<html>"
+  "<head><title>Moved Permanently</title></head>"
+  "<body><h1>301 Moved Permanently</h1></body>"
+  "</html>";
+const char moved_temporarily[] =
+  "<html>"
+  "<head><title>Moved Temporarily</title></head>"
+  "<body><h1>302 Moved Temporarily</h1></body>"
+  "</html>";
+const char not_modified[] =
+  "<html>"
+  "<head><title>Not Modified</title></head>"
+  "<body><h1>304 Not Modified</h1></body>"
+  "</html>";
+const char bad_request[] =
+  "<html>"
+  "<head><title>Bad Request</title></head>"
+  "<body><h1>400 Bad Request</h1></body>"
+  "</html>";
+const char unauthorized[] =
+  "<html>"
+  "<head><title>Unauthorized</title></head>"
+  "<body><h1>401 Unauthorized</h1></body>"
+  "</html>";
+const char forbidden[] =
+  "<html>"
+  "<head><title>Forbidden</title></head>"
+  "<body><h1>403 Forbidden</h1></body>"
+  "</html>";
+const char not_found[] =
+  "<html>"
+  "<head><title>Not Found</title></head>"
+  "<body><h1>404 Not Found</h1></body>"
+  "</html>";
+const char internal_server_error[] =
+  "<html>"
+  "<head><title>Internal Server Error</title></head>"
+  "<body><h1>500 Internal Server Error</h1></body>"
+  "</html>";
+const char not_implemented[] =
+  "<html>"
+  "<head><title>Not Implemented</title></head>"
+  "<body><h1>501 Not Implemented</h1></body>"
+  "</html>";
+const char bad_gateway[] =
+  "<html>"
+  "<head><title>Bad Gateway</title></head>"
+  "<body><h1>502 Bad Gateway</h1></body>"
+  "</html>";
+const char service_unavailable[] =
+  "<html>"
+  "<head><title>Service Unavailable</title></head>"
+  "<body><h1>503 Service Unavailable</h1></body>"
+  "</html>";
+
+std::string to_string(reply::status_type status)
+{
+  switch (status)
+  {
+  case reply::ok:
+    return ok;
+  case reply::created:
+    return created;
+  case reply::accepted:
+    return accepted;
+  case reply::no_content:
+    return no_content;
+  case reply::multiple_choices:
+    return multiple_choices;
+  case reply::moved_permanently:
+    return moved_permanently;
+  case reply::moved_temporarily:
+    return moved_temporarily;
+  case reply::not_modified:
+    return not_modified;
+  case reply::bad_request:
+    return bad_request;
+  case reply::unauthorized:
+    return unauthorized;
+  case reply::forbidden:
+    return forbidden;
+  case reply::not_found:
+    return not_found;
+  case reply::internal_server_error:
+    return internal_server_error;
+  case reply::not_implemented:
+    return not_implemented;
+  case reply::bad_gateway:
+    return bad_gateway;
+  case reply::service_unavailable:
+    return service_unavailable;
+  default:
+    return internal_server_error;
+  }
+}
+
+} // namespace stock_replies
+
+reply reply::stock_reply(reply::status_type status)
+{
+  reply rep;
+  rep.status = status;
+  rep.content = stock_replies::to_string(status);
+  rep.headers.resize(2);
+  rep.headers[0].name = "Content-Length";
+  rep.headers[0].value = boost::lexical_cast<std::string>(rep.content.size());
+  rep.headers[1].name = "Content-Type";
+  rep.headers[1].value = "text/html";
+  return rep;
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/reply.hpp

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+//
+// reply.hpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_REPLY_HPP
+#define HTTP_SERVER2_REPLY_HPP
+
+#include <string>
+#include <vector>
+#include <boost/asio.hpp>
+#include "header.hpp"
+
+namespace http {
+namespace server2 {
+
+/// A reply to be sent to a client.
+struct reply
+{
+  /// The status of the reply.
+  enum status_type
+  {
+    ok = 200,
+    created = 201,
+    accepted = 202,
+    no_content = 204,
+    multiple_choices = 300,
+    moved_permanently = 301,
+    moved_temporarily = 302,
+    not_modified = 304,
+    bad_request = 400,
+    unauthorized = 401,
+    forbidden = 403,
+    not_found = 404,
+    internal_server_error = 500,
+    not_implemented = 501,
+    bad_gateway = 502,
+    service_unavailable = 503
+  } status;
+
+  /// The headers to be included in the reply.
+  std::vector<header> headers;
+
+  /// The content to be sent in the reply.
+  std::string content;
+
+  /// Convert the reply into a vector of buffers. The buffers do not own the
+  /// underlying memory blocks, therefore the reply object must remain valid and
+  /// not be changed until the write operation has completed.
+  std::vector<boost::asio::const_buffer> to_buffers();
+
+  /// Get a stock reply.
+  static reply stock_reply(status_type status);
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_REPLY_HPP

doc/html/boost_asio/example/cpp03/http/server2/request.hpp

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+//
+// request.hpp
+// ~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_REQUEST_HPP
+#define HTTP_SERVER2_REQUEST_HPP
+
+#include <string>
+#include <vector>
+#include "header.hpp"
+
+namespace http {
+namespace server2 {
+
+/// A request received from a client.
+struct request
+{
+  std::string method;
+  std::string uri;
+  int http_version_major;
+  int http_version_minor;
+  std::vector<header> headers;
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_REQUEST_HPP

doc/html/boost_asio/example/cpp03/http/server2/request_handler.cpp

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+//
+// request_handler.cpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 "request_handler.hpp"
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <boost/lexical_cast.hpp>
+#include "mime_types.hpp"
+#include "reply.hpp"
+#include "request.hpp"
+
+namespace http {
+namespace server2 {
+
+request_handler::request_handler(const std::string& doc_root)
+  : doc_root_(doc_root)
+{
+}
+
+void request_handler::handle_request(const request& req, reply& rep)
+{
+  // Decode url to path.
+  std::string request_path;
+  if (!url_decode(req.uri, request_path))
+  {
+    rep = reply::stock_reply(reply::bad_request);
+    return;
+  }
+
+  // Request path must be absolute and not contain "..".
+  if (request_path.empty() || request_path[0] != '/'
+      || request_path.find("..") != std::string::npos)
+  {
+    rep = reply::stock_reply(reply::bad_request);
+    return;
+  }
+
+  // If path ends in slash (i.e. is a directory) then add "index.html".
+  if (request_path[request_path.size() - 1] == '/')
+  {
+    request_path += "index.html";
+  }
+
+  // Determine the file extension.
+  std::size_t last_slash_pos = request_path.find_last_of("/");
+  std::size_t last_dot_pos = request_path.find_last_of(".");
+  std::string extension;
+  if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos)
+  {
+    extension = request_path.substr(last_dot_pos + 1);
+  }
+
+  // Open the file to send back.
+  std::string full_path = doc_root_ + request_path;
+  std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary);
+  if (!is)
+  {
+    rep = reply::stock_reply(reply::not_found);
+    return;
+  }
+
+  // Fill out the reply to be sent to the client.
+  rep.status = reply::ok;
+  char buf[512];
+  while (is.read(buf, sizeof(buf)).gcount() > 0)
+    rep.content.append(buf, is.gcount());
+  rep.headers.resize(2);
+  rep.headers[0].name = "Content-Length";
+  rep.headers[0].value = boost::lexical_cast<std::string>(rep.content.size());
+  rep.headers[1].name = "Content-Type";
+  rep.headers[1].value = mime_types::extension_to_type(extension);
+}
+
+bool request_handler::url_decode(const std::string& in, std::string& out)
+{
+  out.clear();
+  out.reserve(in.size());
+  for (std::size_t i = 0; i < in.size(); ++i)
+  {
+    if (in[i] == '%')
+    {
+      if (i + 3 <= in.size())
+      {
+        int value = 0;
+        std::istringstream is(in.substr(i + 1, 2));
+        if (is >> std::hex >> value)
+        {
+          out += static_cast<char>(value);
+          i += 2;
+        }
+        else
+        {
+          return false;
+        }
+      }
+      else
+      {
+        return false;
+      }
+    }
+    else if (in[i] == '+')
+    {
+      out += ' ';
+    }
+    else
+    {
+      out += in[i];
+    }
+  }
+  return true;
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/request_handler.hpp

@@ -0,0 +1,46 @@
+//
+// request_handler.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_REQUEST_HANDLER_HPP
+#define HTTP_SERVER2_REQUEST_HANDLER_HPP
+
+#include <string>
+#include <boost/noncopyable.hpp>
+
+namespace http {
+namespace server2 {
+
+struct reply;
+struct request;
+
+/// The common handler for all incoming requests.
+class request_handler
+  : private boost::noncopyable
+{
+public:
+  /// Construct with a directory containing files to be served.
+  explicit request_handler(const std::string& doc_root);
+
+  /// Handle a request and produce a reply.
+  void handle_request(const request& req, reply& rep);
+
+private:
+  /// The directory containing the files to be served.
+  std::string doc_root_;
+
+  /// Perform URL-decoding on a string. Returns false if the encoding was
+  /// invalid.
+  static bool url_decode(const std::string& in, std::string& out);
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_REQUEST_HANDLER_HPP

doc/html/boost_asio/example/cpp03/http/server2/request_parser.cpp

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+//
+// request_parser.cpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 "request_parser.hpp"
+#include "request.hpp"
+
+namespace http {
+namespace server2 {
+
+request_parser::request_parser()
+  : state_(method_start)
+{
+}
+
+void request_parser::reset()
+{
+  state_ = method_start;
+}
+
+boost::tribool request_parser::consume(request& req, char input)
+{
+  switch (state_)
+  {
+  case method_start:
+    if (!is_char(input) || is_ctl(input) || is_tspecial(input))
+    {
+      return false;
+    }
+    else
+    {
+      state_ = method;
+      req.method.push_back(input);
+      return boost::indeterminate;
+    }
+  case method:
+    if (input == ' ')
+    {
+      state_ = uri;
+      return boost::indeterminate;
+    }
+    else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
+    {
+      return false;
+    }
+    else
+    {
+      req.method.push_back(input);
+      return boost::indeterminate;
+    }
+  case uri:
+    if (input == ' ')
+    {
+      state_ = http_version_h;
+      return boost::indeterminate;
+    }
+    else if (is_ctl(input))
+    {
+      return false;
+    }
+    else
+    {
+      req.uri.push_back(input);
+      return boost::indeterminate;
+    }
+  case http_version_h:
+    if (input == 'H')
+    {
+      state_ = http_version_t_1;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_t_1:
+    if (input == 'T')
+    {
+      state_ = http_version_t_2;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_t_2:
+    if (input == 'T')
+    {
+      state_ = http_version_p;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_p:
+    if (input == 'P')
+    {
+      state_ = http_version_slash;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_slash:
+    if (input == '/')
+    {
+      req.http_version_major = 0;
+      req.http_version_minor = 0;
+      state_ = http_version_major_start;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_major_start:
+    if (is_digit(input))
+    {
+      req.http_version_major = req.http_version_major * 10 + input - '0';
+      state_ = http_version_major;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_major:
+    if (input == '.')
+    {
+      state_ = http_version_minor_start;
+      return boost::indeterminate;
+    }
+    else if (is_digit(input))
+    {
+      req.http_version_major = req.http_version_major * 10 + input - '0';
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_minor_start:
+    if (is_digit(input))
+    {
+      req.http_version_minor = req.http_version_minor * 10 + input - '0';
+      state_ = http_version_minor;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case http_version_minor:
+    if (input == '\r')
+    {
+      state_ = expecting_newline_1;
+      return boost::indeterminate;
+    }
+    else if (is_digit(input))
+    {
+      req.http_version_minor = req.http_version_minor * 10 + input - '0';
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case expecting_newline_1:
+    if (input == '\n')
+    {
+      state_ = header_line_start;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case header_line_start:
+    if (input == '\r')
+    {
+      state_ = expecting_newline_3;
+      return boost::indeterminate;
+    }
+    else if (!req.headers.empty() && (input == ' ' || input == '\t'))
+    {
+      state_ = header_lws;
+      return boost::indeterminate;
+    }
+    else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
+    {
+      return false;
+    }
+    else
+    {
+      req.headers.push_back(header());
+      req.headers.back().name.push_back(input);
+      state_ = header_name;
+      return boost::indeterminate;
+    }
+  case header_lws:
+    if (input == '\r')
+    {
+      state_ = expecting_newline_2;
+      return boost::indeterminate;
+    }
+    else if (input == ' ' || input == '\t')
+    {
+      return boost::indeterminate;
+    }
+    else if (is_ctl(input))
+    {
+      return false;
+    }
+    else
+    {
+      state_ = header_value;
+      req.headers.back().value.push_back(input);
+      return boost::indeterminate;
+    }
+  case header_name:
+    if (input == ':')
+    {
+      state_ = space_before_header_value;
+      return boost::indeterminate;
+    }
+    else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
+    {
+      return false;
+    }
+    else
+    {
+      req.headers.back().name.push_back(input);
+      return boost::indeterminate;
+    }
+  case space_before_header_value:
+    if (input == ' ')
+    {
+      state_ = header_value;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case header_value:
+    if (input == '\r')
+    {
+      state_ = expecting_newline_2;
+      return boost::indeterminate;
+    }
+    else if (is_ctl(input))
+    {
+      return false;
+    }
+    else
+    {
+      req.headers.back().value.push_back(input);
+      return boost::indeterminate;
+    }
+  case expecting_newline_2:
+    if (input == '\n')
+    {
+      state_ = header_line_start;
+      return boost::indeterminate;
+    }
+    else
+    {
+      return false;
+    }
+  case expecting_newline_3:
+    return (input == '\n');
+  default:
+    return false;
+  }
+}
+
+bool request_parser::is_char(int c)
+{
+  return c >= 0 && c <= 127;
+}
+
+bool request_parser::is_ctl(int c)
+{
+  return (c >= 0 && c <= 31) || (c == 127);
+}
+
+bool request_parser::is_tspecial(int c)
+{
+  switch (c)
+  {
+  case '(': case ')': case '<': case '>': case '@':
+  case ',': case ';': case ':': case '\\': case '"':
+  case '/': case '[': case ']': case '?': case '=':
+  case '{': case '}': case ' ': case '\t':
+    return true;
+  default:
+    return false;
+  }
+}
+
+bool request_parser::is_digit(int c)
+{
+  return c >= '0' && c <= '9';
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/request_parser.hpp

@@ -0,0 +1,95 @@
+//
+// request_parser.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_REQUEST_PARSER_HPP
+#define HTTP_SERVER2_REQUEST_PARSER_HPP
+
+#include <boost/logic/tribool.hpp>
+#include <boost/tuple/tuple.hpp>
+
+namespace http {
+namespace server2 {
+
+struct request;
+
+/// Parser for incoming requests.
+class request_parser
+{
+public:
+  /// Construct ready to parse the request method.
+  request_parser();
+
+  /// Reset to initial parser state.
+  void reset();
+
+  /// Parse some data. The tribool return value is true when a complete request
+  /// has been parsed, false if the data is invalid, indeterminate when more
+  /// data is required. The InputIterator return value indicates how much of the
+  /// input has been consumed.
+  template <typename InputIterator>
+  boost::tuple<boost::tribool, InputIterator> parse(request& req,
+      InputIterator begin, InputIterator end)
+  {
+    while (begin != end)
+    {
+      boost::tribool result = consume(req, *begin++);
+      if (result || !result)
+        return boost::make_tuple(result, begin);
+    }
+    boost::tribool result = boost::indeterminate;
+    return boost::make_tuple(result, begin);
+  }
+
+private:
+  /// Handle the next character of input.
+  boost::tribool consume(request& req, char input);
+
+  /// Check if a byte is an HTTP character.
+  static bool is_char(int c);
+
+  /// Check if a byte is an HTTP control character.
+  static bool is_ctl(int c);
+
+  /// Check if a byte is defined as an HTTP tspecial character.
+  static bool is_tspecial(int c);
+
+  /// Check if a byte is a digit.
+  static bool is_digit(int c);
+
+  /// The current state of the parser.
+  enum state
+  {
+    method_start,
+    method,
+    uri,
+    http_version_h,
+    http_version_t_1,
+    http_version_t_2,
+    http_version_p,
+    http_version_slash,
+    http_version_major_start,
+    http_version_major,
+    http_version_minor_start,
+    http_version_minor,
+    expecting_newline_1,
+    header_line_start,
+    header_lws,
+    header_name,
+    space_before_header_value,
+    header_value,
+    expecting_newline_2,
+    expecting_newline_3
+  } state_;
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_REQUEST_PARSER_HPP

doc/html/boost_asio/example/cpp03/http/server2/server.cpp

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+//
+// server.cpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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/bind/bind.hpp>
+
+namespace http {
+namespace server2 {
+
+server::server(const std::string& address, const std::string& port,
+    const std::string& doc_root, std::size_t io_context_pool_size)
+  : io_context_pool_(io_context_pool_size),
+    signals_(io_context_pool_.get_io_context()),
+    acceptor_(io_context_pool_.get_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(acceptor_.get_executor());
+  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()
+{
+  io_context_pool_.run();
+}
+
+void server::start_accept()
+{
+  new_connection_.reset(new connection(
+        io_context_pool_.get_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_pool_.stop();
+}
+
+} // namespace server2
+} // namespace http

doc/html/boost_asio/example/cpp03/http/server2/server.hpp

@@ -0,0 +1,68 @@
+//
+// server.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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)
+//
+
+#ifndef HTTP_SERVER2_SERVER_HPP
+#define HTTP_SERVER2_SERVER_HPP
+
+#include <boost/asio.hpp>
+#include <string>
+#include <vector>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include "connection.hpp"
+#include "io_context_pool.hpp"
+#include "request_handler.hpp"
+
+namespace http {
+namespace server2 {
+
+/// The top-level class of the HTTP server.
+class server
+  : private boost::noncopyable
+{
+public:
+  /// Construct the server to listen on the specified TCP address and port, and
+  /// serve up files from the given directory.
+  explicit server(const std::string& address, const std::string& port,
+      const std::string& doc_root, std::size_t io_context_pool_size);
+
+  /// Run the server's io_context loop.
+  void run();
+
+private:
+  /// Initiate an asynchronous accept operation.
+  void start_accept();
+
+  /// Handle completion of an asynchronous accept operation.
+  void handle_accept(const boost::system::error_code& e);
+
+  /// Handle a request to stop the server.
+  void handle_stop();
+
+  /// The pool of io_context objects used to perform asynchronous operations.
+  io_context_pool io_context_pool_;
+
+  /// The signal_set is used to register for process termination notifications.
+  boost::asio::signal_set signals_;
+
+  /// Acceptor used to listen for incoming connections.
+  boost::asio::ip::tcp::acceptor acceptor_;
+
+  /// The next connection to be accepted.
+  connection_ptr new_connection_;
+
+  /// The handler for all incoming requests.
+  request_handler request_handler_;
+};
+
+} // namespace server2
+} // namespace http
+
+#endif // HTTP_SERVER2_SERVER_HPP