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Power of C++ - Developing a Portable HTTP Server with Python Interpreter using Boost, TinyXML

, 1 Jun 2008
This article describes portable networking library (ahttp) and small HTTP server - result of modern C++ programming approaches investigation
ahttpserver_demo.zip
ahttpserver_demo
ahttpserver.exe
boost_python-vc80-mt-1_34_1.dll
python_handler.dll
web
images
icon_dir.gif
icon_file.gif
icon_virtual_dir.gif
python
favicon.ico
print.pyhtml
ahttpserver_src.zip
ahttplib
aconnect
ahttp
http_header_read_check.inl
tinyxml
ahttpserver
out
server.config.ubuntu
web
images
icon_dir.gif
icon_file.gif
icon_virtual_dir.gif
python
python_handler
wrappers.inl
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module.inl
server.config.win-debug
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print.pyhtml
/*
This file is part of [ahttp] library. 

Author: Artem Kustikov (kustikoff[at]tut.by)
version: 0.1

This code is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this code.

Permission is granted to anyone to use this code for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

1. The origin of this code must not be misrepresented; you must
not claim that you wrote the original code. If you use this
code in a product, an acknowledgment in the product documentation
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original code.

3. This notice may not be removed or altered from any source
distribution.
*/

#include "aconnect/boost_format_safe.hpp"

#include <assert.h>
#include <boost/lexical_cast.hpp>

#include "aconnect/aconnect.hpp"
#include "aconnect/util.hpp"
#include "aconnect/time_util.hpp"

#include "ahttp/http_support.hpp"
#include "ahttp/http_messages.hpp"
#include "ahttp/http_server_settings.hpp"
#include "ahttp/http_response_header.hpp"
#include "ahttp/http_response.hpp"

namespace ahttp
{
	//////////////////////////////////////////////////////////////////////////
	//
	//		HttpResponse
	//

	void HttpResponse::fillCommonResponseHeaders () 
	{
		if( !serverName_.empty() )
			Header.Headers [detail::HeaderServer] = serverName_;
		Header.Headers [detail::HeaderDate] = detail::formatDate_RFC1123 (aconnect::util::getDateTimeUtc ());
	}

	void HttpResponse::sentHeaders () throw (std::runtime_error)
	{
		assert ( !headersSent_ && "Headers already sent" );
		assert ( httpMethod_ != ahttp::HttpMethod::Unknown && "HTTP method is not loaded");
		if (headersSent_)
			throw std::runtime_error ("HTTP headers already sent");

		applyContentEncoding();
		fillCommonResponseHeaders();
		
		aconnect::util::writeToSocket (clientInfo_->socket, 
			Header.getContent());

		headersSent_ = true;
	}


	void HttpResponse::applyContentEncoding () 
	{
		if ( !Header.hasHeader (detail::HeaderContentLength) ) 
		{
			Stream.setChunkedMode ();
			Header.Headers[detail::HeaderTransferEncoding] = detail::TransferEncodingChunked;
		}
	}

	void HttpResponse::writeCompleteHtmlResponse (aconnect::string_constref response) throw (std::runtime_error) 
	{
		Header.setContentType (detail::ContentTypeTextHtml);
		writeCompleteResponse (response);
	}

	void HttpResponse::writeCompleteResponse (aconnect::string_constref response) throw (std::runtime_error)
	{
		assert ( !finished_ && "Response already sent" );
		assert ( !headersSent_ && "Headers already sent" );

		if (headersSent_)
			throw std::runtime_error ("HTTP headers already sent");
		if (finished_)
			throw std::runtime_error ("Response already sent");

		
		Header.setContentLength ( response.size ());
		sentHeaders();
	
		Stream.clear();
		Stream.writeDirectly (response);
		
		finished_ = true;
	}


	void HttpResponse::write (aconnect::string_constptr buff, size_t dataSize) 
	{
		if (finished_)
			throw std::runtime_error ("Response already sent");

		if (!headersSent_ && Stream.willBeFlushed ( dataSize ))
			sentHeaders();

		Stream.write (buff, dataSize);
	}

	void HttpResponse::write (aconnect::string_constref content) 
	{
		write (content.c_str(), content.size() );
	}

	void HttpResponse::flush () throw (aconnect::socket_error) 
	{
		if (!headersSent_)
			sentHeaders();
		
		Stream.flush();
	}

	void HttpResponse::end () throw (aconnect::socket_error) 
	{
		// setup correct content length
		if (!headersSent_) 
			Header.setContentLength ( Stream.getBufferContentSize() );
		
		flush();
		Stream.end();

		// INVESTIGATE: Keep-alive fix for Firefox
		Stream.writeDirectly ("");

		finished_ = true;
	}

	//////////////////////////////////////////////////////////////////////////
	// statics
	aconnect::string HttpResponse::getErrorResponse (int status, 
		aconnect::string_constptr messageFormat, ...)
	{
		using namespace boost;
		aconnect::str_stream ret;
		aconnect::string statusDesc = detail::httpStatusDesc (status);
		aconnect::string description = messages::ErrorUndefined;

		if (messageFormat) {
			FORMAT_VA_MESSAGE (messageFormat, message);
			description.swap (message);
		}
		
		ret << str(format(messages::MessageFormat) % statusDesc % statusDesc % description);
		return ret.str();
	}

	//
	//
	//////////////////////////////////////////////////////////////////////////


	//////////////////////////////////////////////////////////////////////////
	//
	//		HttpResponseStream
	//
	void HttpResponseStream::write (aconnect::string_constref content) 
	{	
		buffer_.append (content);
		if (buffer_.size() >= maxBuffSize_)
			flush ();
	};

	void HttpResponseStream::write (aconnect::string_constptr buff, size_t dataSize)
	{	
		buffer_.append (buff, dataSize);
		if (buffer_.size() >= maxBuffSize_)
			flush ();
	};

	void HttpResponseStream::writeDirectly (aconnect::string_constref content) throw (aconnect::socket_error)
	{
		assert (!chunked_ && "writeDirectly must not be called in 'chunked' mode");
		if (sendContent_)
			aconnect::util::writeToSocket (socket_, content);
	}

	void HttpResponseStream::flush () throw (aconnect::socket_error)
	{	
		using boost::format;
		using namespace aconnect;

		if (buffer_.empty())
			return;
		
		if (!sendContent_)
			return;

		if (chunked_) {
			const size_t bufferLen = buffer_.size();
			size_t curPos = 0, chunkSize = bufferLen;
			format chunkFormat (detail::ChunkHeaderFormat);

			if (chunkSize > maxChunkSize_)
				chunkSize = maxChunkSize_;

			do 
			{
				// write chunk size
				chunkFormat % chunkSize;
				util::writeToSocket (socket_, chunkFormat.str());
				chunkFormat.clear();

				// write data
				util::writeToSocket (socket_, buffer_.c_str() + curPos, 
					(int) chunkSize);
				
				// write chunk end mark
				util::writeToSocket (socket_, detail::ChunkEndMark);

				curPos += chunkSize;
				chunkSize = util::min2 (maxChunkSize_, bufferLen- curPos);

			} while (curPos < bufferLen);
			
		} else {
			util::writeToSocket (socket_, buffer_);
		}

		buffer_.clear();
	};

	void HttpResponseStream::end () throw (aconnect::socket_error)
	{	
		if (chunked_ && sendContent_) {
			// write last chunk
			aconnect::util::writeToSocket (socket_, aconnect::string (detail::LastChunkFormat) );
		}
	};
}
//
//
//////////////////////////////////////////////////////////////////////////

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About the Author

Artem Kustikov
Software Developer (Senior)
Belarus Belarus
No Biography provided

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