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Boost::asio async_read
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// schedule_read is called o start reading | |
void connection::connect() | |
{ | |
boost::asio::ip::tcp::resolver resolver(_io); | |
boost::asio::ip::tcp::resolver::query query(_hostname, std::to_string(_port)); | |
boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query); | |
boost::system::error_code ec; | |
boost::asio::connect(_socket, iterator, ec); | |
if (ec) | |
{ | |
error("Cannot connect: " + ec.message()); | |
throw fatal_exception(ec.message()); | |
} | |
schedule_read(); | |
} | |
connection::connection(): | |
_socket(_io), | |
{ | |
// _io is an instance variable | |
_thread.reset(new std::thread(boost::bind(&boost::asio::io_service::run, &_io))); | |
_worker.reset(new boost::asio::io_service::work(_io)); | |
connect(); | |
} | |
void connection::schedule_read() | |
{ | |
// _read_buf is a boost::asio::streambuf | |
boost::asio::streambuf::mutable_buffers_type mutableBuffer = _read_buf.prepare(1024); | |
// _socket.async_read_some(mutableBuffer, boost::bind(&connection::read_handler, this, _1, _2)); | |
boost::asio::async_read(_socket, mutableBuffer, boost::asio::transfer_at_least(1), boost::bind(&connection::read_handler, this, _1, _2)); | |
} | |
void connection::read_handler(const boost::system::error_code &ec, std::size_t bytes_read) | |
{ | |
// _read_buf is a boost::asio::streambuf | |
trace("socket read returns: " + ec.message()); | |
if (!ec) | |
{ | |
trace(boost::str(boost::format("Read %d bytes") % bytes_read)); | |
if (bytes_read > 0) | |
{ | |
_read_buf.commit(bytes_read); | |
boost::asio::streambuf::const_buffers_type bufs = _read_buf.data(); | |
std::string data(boost::asio::buffers_begin(bufs), boost::asio::buffers_end(bufs)); | |
trace(boost::str(boost::format("Connection is %p") % _connection.get())); | |
std::size_t size = _connection->parse(data.c_str(), data.size()); | |
trace(boost::str(boost::format("Consumed %d bytes") % size)); | |
_read_buf.consume(size); | |
trace(boost::str(boost::format("Still on buffer %d bytes") % _read_buf.size())); | |
} | |
schedule_read(); | |
} | |
else | |
{ | |
if (!_closing) | |
{ | |
throw fatal_exception("Error on connection: " + ec.message()); | |
} | |
} | |
} |
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