boost::asio::async_read loops infinite with zero byte of received data - c++

Question

I am trying to write IO_Service based async TCP client where Async_write works fine but async_read runs in infinite loop . During my trial to rectify the issue i found that in all the other cases async_read just stops receiving data , it receives nothing until i stop the server. Below is the code and the links which i tried before posting my query.
The suggestions i tried are exactly as mine , 2 , 3 and but in all the cases my async_read handler does not read anything . In one and only one case it start infinite loop when i set buffer as boost::asio::mutable_buffer bytes; in rest cases i have tried boost::array<char, 512> bytes; , boost::asio::streambuf bytes; and char bytes[512]; where the async_read handler is not raised.
After going through all of these solution I am now confused : can it be the problem of buffer ? Do I need to initialize it before passing to read
?
Please guide.
ScalableSocket::ScalableSocket()
{
//ctor
using namespace boost::asio;
service = boost::make_shared<io_service>();
work = boost::make_shared<io_service::work>(*service );
strand = boost::make_shared<io_service::strand>( *service );
worker_threads = boost::make_shared<boost::thread_group>();
worker_threads->create_thread(boost::bind(&ScalableSocket::WorkerThread,this));
resolver = boost::make_shared<boost::asio::ip::tcp::resolver> (*service);
tcp_socket= boost::make_shared<boost::asio::ip::tcp::socket> (*service);
boost::asio::ip::tcp::resolver::query q(boost::asio::ip::tcp::v4(),"192.168.100.96","9602");
boost::asio::ip::tcp::resolver::iterator it = resolver->resolve(q);
boost::asio::async_connect(*tcp_socket,it,boost::bind(&ScalableSocket::connect_handler,this,boost::asio::placeholders::error));
tcp_socket->set_option(boost::asio::ip::tcp::no_delay(true) );
}
ScalableSocket::~ScalableSocket()
{
//dtor
}
void ScalableSocket::PublishPost()
{
strand->post(boost::bind(&ScalableSocket::OnSend,this));
}
void ScalableSocket::OnSend()
{
boost::array<char, 6> a = { 'a', 'b', 'c', 'd', 'e' };
boost::asio::async_write(*tcp_socket,boost::asio::buffer(a),
boost::bind(&ScalableSocket::write_handler, this, boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));
}
void ScalableSocket::WorkerThread()
{
while( true )
{
try
{
boost::system::error_code ec;
service->run( ec );
if( ec )
{
///LOGE(ec);
}
break;
}
catch( std::exception & ex )
{
///LOGE(ex.what());
}
}
}
void ScalableSocket::connect_handler(const boost::system::error_code &ec)
{
if (!ec)
{
PublishPost();
/* boost::asio::async_read(*tcp_socket,
boost::asio::buffer(bytes),
boost::bind(&ScalableSocket::read_handler, this,
boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));
*/
///https://stackoverflow.com/questions/4527443/problems-using-boostasioasync-read
boost::shared_ptr<boost::array<char, 512>> buf(new boost::array<char, 512>);
boost::asio::async_read(*tcp_socket,boost::asio::buffer(*buf),
boost::bind(&ScalableSocket::read_handler, this,buf,
boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));
}
else
{
cout<<" Some error connecting to Exchange "<< ec.message()<<endl;
}
}
void ScalableSocket::OnTimer(const boost::system::error_code &ec)
{
if(!ec)
{
printf("\n\n Heartbeat event raised sending KeepAlive to exchange \n\n");
PublishPost();
HeartBeatTimer->async_wait(boost::bind(&ScalableSocket::OnTimer,this, boost::asio::placeholders::error));
}
}
void ScalableSocket::recvData()
{
boost::system::error_code error;
boost::array<char, 1024> buf;
//for(;;)
{
size_t len = tcp_socket->read_some(boost::asio::buffer(buf), error);
cout<<"\n Recv data size is "<<len;
}
}
void ScalableSocket::read_handler(boost::shared_ptr<boost::array<char, 512>> buf,const boost::system::error_code &ec,std::size_t bytes_transferred)
{
if (!ec )//&& bytes_transferred > 0)
{
///recvData(); /// If i enable this code during infinite loop it start getting data that means socket has no issue
cout << " Data size recieved "<< bytes_transferred<<endl;
boost::asio::async_read(*tcp_socket,boost::asio::buffer(*buf),
boost::bind(&ScalableSocket::read_handler, this,buf,
boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));
}
else
{
/// Some issue with socket publish error , inform user and reconnect
cout<<" Some error reading data from Exchange "<< ec.message()<<endl;
}
}
void ScalableSocket::write_handler(const boost::system::error_code& error,std::size_t bytes_transferred)
{
if(!error)
{
/// data Sent successfully
cout<< " Data sent size "<< bytes_transferred<<endl;
}
else
{
cout<<" Some error sending data to Exchange "<< error.message()<<endl;
}
}

Answer 1

asnyc_readwill NOT "return" / call the handler until the given buffer is completely full.
asnyc_read_some will return after some bytes have been read. This might be the function you're looking for.
Remember to handle received data correctly with asnyc_read_some. If you send 512 bytes, it may arrive in a couple of reads, depending on the machine.