pion  5.0.6
include/pion/http/response_writer.hpp
00001 // ---------------------------------------------------------------------
00002 // pion:  a Boost C++ framework for building lightweight HTTP interfaces
00003 // ---------------------------------------------------------------------
00004 // Copyright (C) 2007-2014 Splunk Inc.  (https://github.com/splunk/pion)
00005 //
00006 // Distributed under the Boost Software License, Version 1.0.
00007 // See http://www.boost.org/LICENSE_1_0.txt
00008 //
00009 
00010 #ifndef __PION_HTTP_RESPONSE_WRITER_HEADER__
00011 #define __PION_HTTP_RESPONSE_WRITER_HEADER__
00012 
00013 #include <boost/asio.hpp>
00014 #include <boost/bind.hpp>
00015 #include <boost/noncopyable.hpp>
00016 #include <boost/shared_ptr.hpp>
00017 #include <boost/enable_shared_from_this.hpp>
00018 #include <pion/config.hpp>
00019 #include <pion/http/writer.hpp>
00020 #include <pion/http/request.hpp>
00021 #include <pion/http/response.hpp>
00022 
00023 
00024 namespace pion {    // begin namespace pion
00025 namespace http {    // begin namespace http
00026 
00027 
00031 class PION_API response_writer :
00032     public http::writer,
00033     public boost::enable_shared_from_this<response_writer>
00034 {
00035 public:
00036     
00038     virtual ~response_writer() {}
00039 
00050     static inline boost::shared_ptr<response_writer> create(tcp::connection_ptr& tcp_conn,
00051                                                                http::response_ptr& http_response_ptr,
00052                                                                finished_handler_t handler = finished_handler_t())
00053     {
00054         return boost::shared_ptr<response_writer>(new response_writer(tcp_conn, http_response_ptr, handler));
00055     }
00056 
00067     static inline boost::shared_ptr<response_writer> create(tcp::connection_ptr& tcp_conn,
00068                                                                const http::request& http_request,
00069                                                                finished_handler_t handler = finished_handler_t())
00070     {
00071         return boost::shared_ptr<response_writer>(new response_writer(tcp_conn, http_request, handler));
00072     }
00073     
00075     inline http::response& get_response(void) { return *m_http_response; }
00076     
00077     
00078 protected:
00079     
00087     response_writer(tcp::connection_ptr& tcp_conn, http::response_ptr& http_response_ptr,
00088                        finished_handler_t handler)
00089         : http::writer(tcp_conn, handler), m_http_response(http_response_ptr)
00090     {
00091         set_logger(PION_GET_LOGGER("pion.http.response_writer"));
00092         // tell the http::writer base class whether or not the client supports chunks
00093         supports_chunked_messages(m_http_response->get_chunks_supported());
00094         // check if we should initialize the payload content using
00095         // the response's content buffer
00096         if (m_http_response->get_content_length() > 0
00097             && m_http_response->get_content() != NULL
00098             && m_http_response->get_content()[0] != '\0')
00099         {
00100             write_no_copy(m_http_response->get_content(), m_http_response->get_content_length());
00101         }
00102     }
00103     
00111     response_writer(tcp::connection_ptr& tcp_conn, const http::request& http_request,
00112                        finished_handler_t handler)
00113         : http::writer(tcp_conn, handler), m_http_response(new http::response(http_request))
00114     {
00115         set_logger(PION_GET_LOGGER("pion.http.response_writer"));
00116         // tell the http::writer base class whether or not the client supports chunks
00117         supports_chunked_messages(m_http_response->get_chunks_supported());
00118     }
00119     
00120     
00126     virtual void prepare_buffers_for_send(http::message::write_buffers_t& write_buffers) {
00127         if (get_content_length() > 0)
00128             m_http_response->set_content_length(get_content_length());
00129         m_http_response->prepare_buffers_for_send(write_buffers,
00130                                                get_connection()->get_keep_alive(),
00131                                                sending_chunked_message());
00132     }   
00133 
00135     virtual write_handler_t bind_to_write_handler(void) {
00136         return boost::bind(&response_writer::handle_write, shared_from_this(),
00137                            boost::asio::placeholders::error,
00138                            boost::asio::placeholders::bytes_transferred);
00139     }
00140 
00147     virtual void handle_write(const boost::system::error_code& write_error,
00148                              std::size_t bytes_written)
00149     {
00150         logger log_ptr(get_logger());
00151         if (!write_error) {
00152             // response sent OK
00153             if (sending_chunked_message()) {
00154                 PION_LOG_DEBUG(log_ptr, "Sent HTTP response chunk of " << bytes_written << " bytes");
00155             } else {
00156                 PION_LOG_DEBUG(log_ptr, "Sent HTTP response of " << bytes_written << " bytes ("
00157                                << (get_connection()->get_keep_alive() ? "keeping alive)" : "closing)"));
00158             }
00159         }
00160         finished_writing(write_error);
00161     }
00162 
00163     
00164 private:
00165     
00167     http::response_ptr      m_http_response;
00168     
00170     std::string             m_response_line;
00171 };
00172 
00173 
00175 typedef boost::shared_ptr<response_writer>   response_writer_ptr;
00176 
00177 
00179 template <typename T>
00180 const response_writer_ptr& operator<<(const response_writer_ptr& writer, const T& data) {
00181     writer->write(data);
00182     return writer;
00183 }
00184 
00185 inline response_writer_ptr& operator<<(response_writer_ptr& writer, std::ostream& (*iomanip)(std::ostream&)) {
00186     writer->write(iomanip);
00187     return writer;
00188 }
00189 
00190 }   // end namespace http
00191 }   // end namespace pion
00192 
00193 #endif