usagi · August 28, 2016 02:46
diff --git a/file0.txt b/file0.txt
 sudo apt install nginx clang-3.8 libfcgi-dev spawn-fcgi
diff --git a/file1.cpp b/file1.cpp
 // EXTERNAL
 #include "fcgio.h"
 // STD
 #include <iostream>
 #include <memory>
 #include <functional>
 #include <cstring>

 auto main() -> int
 {
  // 元の標準入出力系の streambuf 群をバックアップ＆カスタムデリーターによるリストア処理の予約
  using streambuf_restorer_signature_type = auto ( std::streambuf* ) -> void;
  using streambuf_restorer_functor_type = std::function< streambuf_restorer_signature_type >;
  using streambuf_restorer_type = std::unique_ptr< std::streambuf, streambuf_restorer_functor_type >;

  const auto cin_restorer  = streambuf_restorer_type( std::cin.rdbuf(), []( auto in ) { std::cin.rdbuf( in ); } );
  const auto cout_restorer = streambuf_restorer_type( std::cout.rdbuf(), []( auto in ) { std::cout.rdbuf( in ); } );
  const auto cerr_restorer = streambuf_restorer_type( std::cerr.rdbuf(), []( auto in ) { std::cerr.rdbuf( in ); } );

  FCGX_Request request;

  FCGX_Init();
  FCGX_InitRequest( &request, 0, 0 );

  while ( FCGX_Accept_r( &request ) == 0 )
  {
    auto cin_buffer  = fcgi_streambuf( request.in );
    auto cout_buffer = fcgi_streambuf( request.out );
    auto cerr_buffer = fcgi_streambuf( request.err );

    std::cin.rdbuf( &cin_buffer );
    std::cout.rdbuf( &cout_buffer );
    std::cerr.rdbuf( &cerr_buffer );

    constexpr auto content_header_part = u8R"(Content-type: text/html

 <html>
  <head>
    <title>Hello, World!</title>
  </head>
  <body>
 )";

    constexpr auto content_footer_part = u8R"(  </body>
 </html>
 )";

    // リクエストにいわゆる POST で投げられたデータがあるか CONTENT_LENGTH で確認
    const auto in_content_length_string = FCGX_GetParam( "CONTENT_LENGTH", request.envp );
    const auto in_content_length = std::strlen( in_content_length_string )
      ? std::stoull( std::string( in_content_length_string ) )
      : 0ull
      ;

    // リクエストの CONTENT_LENGTH だけリクエストボディーを読み出す
    std::string in_content;
    in_content.resize( in_content_length );
    std::cin.read( &in_content[0], in_content_length );

    // レスポンスを出力する
    std::cout
      << content_header_part
      << "    <h1>Hello, World!</h>\n"
         "    <p>REQUEST_URI: " << FCGX_GetParam( "REQUEST_URI", request.envp ) << "</p>\n"
         "    <p>REQUEST CONTENT_LENGTH: " << in_content_length << "</p>\n"
         "    <p>REQUEST CONTENT: " << in_content << "</p>\n"
      << content_footer_part
      ;

    // スコープの終了により明示的に std::flush して居なくても fcgi_streambuf のデストラクターでフラッシュされる
  }

  // スコープの終了により標準入出力系の streambuf 群は自動的にバックアップからリストアされる
 }
diff --git a/file2.txt b/file2.txt
 clang++-3.8 -std=c++14 hello_world.cxx -lfcgi++ -lfcgi -o hello_world
diff --git a/file3.txt b/file3.txt
 g++-5 -std=c++14 hello_world.cxx -lfcgi++ -lfcgi -o hello_world
diff --git a/file4.txt b/file4.txt
 spawn-fcgi -p 58000 -n hello_world
diff --git a/file5.conf b/file5.conf
 server
 {
  listen 80;
  server_name localhost;

  location /hello_world
  {
    # spawn-fcgi でプロセスを動作させる host:port
    fastcgi_pass   127.0.0.1:58000;
    # nginx の FCGI 各種パラメーター群の設定
    fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
    fastcgi_param  SERVER_SOFTWARE    nginx;
    fastcgi_param  QUERY_STRING       $query_string;
    fastcgi_param  REQUEST_METHOD     $request_method;
    fastcgi_param  CONTENT_TYPE       $content_type;
    fastcgi_param  CONTENT_LENGTH     $content_length;
    fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
    fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
    fastcgi_param  REQUEST_URI        $request_uri;
    fastcgi_param  DOCUMENT_URI       $document_uri;
    fastcgi_param  DOCUMENT_ROOT      $document_root;
    fastcgi_param  SERVER_PROTOCOL    $server_protocol;
    fastcgi_param  REMOTE_ADDR        $remote_addr;
    fastcgi_param  REMOTE_PORT        $remote_port;
    fastcgi_param  SERVER_ADDR        $server_addr;
    fastcgi_param  SERVER_PORT        $server_port;
    fastcgi_param  SERVER_NAME        $server_name;
  }
 }
diff --git a/file6.txt b/file6.txt
 curl -i -s -X POST -d 'this is the post content.' http://localhost/test1/hoge/fuga/piyo
diff --git a/file7.html b/file7.html
 HTTP/1.1 200 OK
 Server: nginx/1.10.0 (Ubuntu)
 Date: Sun, 28 Aug 2016 02:21:31 GMT
 Content-Type: text/html
 Transfer-Encoding: chunked
 Connection: keep-alive

 <html>
  <head>
    <title>Hello, World!</title>
  </head>
  <body>
    <h1>Hello, World!</h>
    <p>REQUEST_URI: /test1/hoge/fuga/piyo</p>
    <p>REQUEST CONTENT_LENGTH: 25</p>
    <p>REQUEST CONTENT: this is the post content.</p>
  </body>
 </html>
	// EXTERNAL
	#include "fcgio.h"
	// STD
	#include <iostream>
	#include <memory>
	#include <functional>
	#include <cstring>

	auto main() -> int
	{
	// 元の標準入出力系の streambuf 群をバックアップ＆カスタムデリーターによるリストア処理の予約
	using streambuf_restorer_signature_type = auto ( std::streambuf* ) -> void;
	using streambuf_restorer_functor_type = std::function< streambuf_restorer_signature_type >;
	using streambuf_restorer_type = std::unique_ptr< std::streambuf, streambuf_restorer_functor_type >;

	const auto cin_restorer = streambuf_restorer_type( std::cin.rdbuf(), []( auto in ) { std::cin.rdbuf( in ); } );
	const auto cout_restorer = streambuf_restorer_type( std::cout.rdbuf(), []( auto in ) { std::cout.rdbuf( in ); } );
	const auto cerr_restorer = streambuf_restorer_type( std::cerr.rdbuf(), []( auto in ) { std::cerr.rdbuf( in ); } );

	FCGX_Request request;

	FCGX_Init();
	FCGX_InitRequest( &request, 0, 0 );

	while ( FCGX_Accept_r( &request ) == 0 )
	{
	auto cin_buffer = fcgi_streambuf( request.in );
	auto cout_buffer = fcgi_streambuf( request.out );
	auto cerr_buffer = fcgi_streambuf( request.err );

	std::cin.rdbuf( &cin_buffer );
	std::cout.rdbuf( &cout_buffer );
	std::cerr.rdbuf( &cerr_buffer );

	constexpr auto content_header_part = u8R"(Content-type: text/html

	<html>
	<head>
	<title>Hello, World!</title>
	</head>
	<body>
	)";

	constexpr auto content_footer_part = u8R"( </body>
	</html>
	)";

	// リクエストにいわゆる POST で投げられたデータがあるか CONTENT_LENGTH で確認
	const auto in_content_length_string = FCGX_GetParam( "CONTENT_LENGTH", request.envp );
	const auto in_content_length = std::strlen( in_content_length_string )
	? std::stoull( std::string( in_content_length_string ) )
	: 0ull
	;

	// リクエストの CONTENT_LENGTH だけリクエストボディーを読み出す
	std::string in_content;
	in_content.resize( in_content_length );
	std::cin.read( &in_content[0], in_content_length );

	// レスポンスを出力する
	std::cout
	<< content_header_part
	<< " <h1>Hello, World!</h>\n"
	" <p>REQUEST_URI: " << FCGX_GetParam( "REQUEST_URI", request.envp ) << "</p>\n"
	" <p>REQUEST CONTENT_LENGTH: " << in_content_length << "</p>\n"
	" <p>REQUEST CONTENT: " << in_content << "</p>\n"
	<< content_footer_part
	;

	// スコープの終了により明示的に std::flush して居なくても fcgi_streambuf のデストラクターでフラッシュされる
	}

	// スコープの終了により標準入出力系の streambuf 群は自動的にバックアップからリストアされる
	}
	server
	{
	listen 80;
	server_name localhost;

	location /hello_world
	{
	# spawn-fcgi でプロセスを動作させる host:port
	fastcgi_pass 127.0.0.1:58000;
	# nginx の FCGI 各種パラメーター群の設定
	fastcgi_param GATEWAY_INTERFACE CGI/1.1;
	fastcgi_param SERVER_SOFTWARE nginx;
	fastcgi_param QUERY_STRING $query_string;
	fastcgi_param REQUEST_METHOD $request_method;
	fastcgi_param CONTENT_TYPE $content_type;
	fastcgi_param CONTENT_LENGTH $content_length;
	fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
	fastcgi_param SCRIPT_NAME $fastcgi_script_name;
	fastcgi_param REQUEST_URI $request_uri;
	fastcgi_param DOCUMENT_URI $document_uri;
	fastcgi_param DOCUMENT_ROOT $document_root;
	fastcgi_param SERVER_PROTOCOL $server_protocol;
	fastcgi_param REMOTE_ADDR $remote_addr;
	fastcgi_param REMOTE_PORT $remote_port;
	fastcgi_param SERVER_ADDR $server_addr;
	fastcgi_param SERVER_PORT $server_port;
	fastcgi_param SERVER_NAME $server_name;
	}
	}
	HTTP/1.1 200 OK
	Server: nginx/1.10.0 (Ubuntu)
	Date: Sun, 28 Aug 2016 02:21:31 GMT
	Content-Type: text/html
	Transfer-Encoding: chunked
	Connection: keep-alive

	<html>
	<head>
	<title>Hello, World!</title>
	</head>
	<body>
	<h1>Hello, World!</h>
	<p>REQUEST_URI: /test1/hoge/fuga/piyo</p>
	<p>REQUEST CONTENT_LENGTH: 25</p>
	<p>REQUEST CONTENT: this is the post content.</p>
	</body>
	</html>