[Boost-users] [ASIO] Streambuf not containing full line

Subject: [Boost-users] [ASIO] Streambuf not containing full line
From: Gonzalo Garramuno (ggarra13_at_[hidden])
Date: 2014-02-26 14:55:13

I am using asio asynchronically.  I have:

void tcp_session::start_read()
{
    // Set a deadline for the read operation.

    // input_deadline_.expires_from_now(boost::posix_time::seconds(30));
    // input_deadline_.expires_at(boost::posix_time::pos_infin);

    // Start an asynchronous operation to read a newline-delimited message.
    boost::asio::async_read_until(socket(), input_buffer_, '\n',
                  boost::bind(&tcp_session::handle_read,
                          shared_from_this(),
                          boost::asio::placeholders::error));
}

void tcp_session::handle_read(const boost::system::error_code& ec)
{
    if (stopped())
       return;

    if (!ec)
    {
       // Extract the newline-delimited message from the buffer.
       std::string msg;
       std::istream is(&input_buffer_);
        is.exceptions( std::ifstream::failbit | std::ifstream::badbit |
                   std::ifstream::eofbit );

       try {
      while ( std::getline(is, msg) )
      {
         // parse msg here (gets truncated to last 256 chars or so)
         std::cerr << msg << std::endl;
      }
       }
       catch ( const std::ios_base::failure& e )
       {
         std::cerr << "getline failure " << e.what() << std::endl;
       }
}

My problem is that I am seeing messages that are not a full line, but a 
truncation of the line, as if a buffer gets full with 256 characters.  I 
am unsure what I am doing wrong. I get a getline failure saying 
basic_ios::clear.