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POLarge body sent via boost::asio::tcp::ip
 

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  1. POLarge body sent via boost::asio::tcp::ip
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    <p>My protocol is very easy: I sent a <code>size_t</code> indicating the size of body and then the body itself. </p> <p>The code is based on the <a href="http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/examples.html" rel="nofollow">official Boost examples</a>, here it is:</p> <pre><code>class tcp_conn : public std::enable_shared_from_this&lt;tcp_conn&gt;, private boost::noncopyable { public: tcp_conn(ba::io_service&amp; io_service); void start(); void stop(); tcp::socket&amp; socket(); private: void handle_read_header(const error_code&amp; e, std::size_t bytes_transferred); void handle_read(const error_code&amp; e, std::size_t bytes_transferred); ba::streambuf::mutable_buffers_type buffer_wrapper_; ba::streambuf buffer_; std::size_t buffer_size_; tcp::socket socket_; }; </code></pre> <p>And the implementation is:</p> <pre><code>void tcp_conn::start() { socket_.async_read_some( ba::buffer(&amp;buffer_size_, sizeof(buffer_size_)), boost::bind( &amp;tcp_conn::handle_read_header, this, ba::placeholders::error, ba::placeholders::bytes_transferred ) ); } void tcp_conn::handle_read_header(const boost::system::error_code&amp; e, std::size_t bytes_transferred){ if(!e) { buffer_wrapper_ = buffer_.prepare(buffer_size_); socket_.async_read_some( ba::buffer(buffer_wrapper_), boost::bind( &amp;tcp_conn::handle_read, this, ba::placeholders::error, ba::placeholders::bytes_transferred ) ); } else { //stop connection } } void tcp_conn::handle_read(const boost::system::error_code&amp; e, std::size_t bytes_transferred) { if (!e ) { buffer_.commit(bytes_transferred); if(buffer_.size() == buffer_size_) { std::cout &lt;&lt; "WHOLE BODY TRANSFERED NOW" &lt;&lt; std::endl; //has all data in buffer, handle it. } else { std::cout &lt;&lt; "NOT WHOLE BODY TRANSFERED, still got "&lt;&lt; (buffer_size_ - bytes_transferred) &lt;&lt; " to go" &lt;&lt; std::endl; socket_.async_read_some( ba::buffer(buffer_wrapper_), boost::bind( &amp;tcp_conn::handle_read, this, ba::placeholders::error, ba::placeholders::bytes_transferred ) ); } } else { //handle error } } </code></pre> <p>This doesn't quite work. I'm guessing my error is somewhere in the recursive updates of <code>buffer_wrapper_</code> - some data gets lost, overwritten?</p>
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