// This may look like C, but it's really -*- C++ -*-
// $Id$

#include "DIOP_Transport.h"

#if defined (TAO_HAS_DIOP) && (TAO_HAS_DIOP != 0)

#include "DIOP_Connection_Handler.h"
#include "DIOP_Acceptor.h"
#include "DIOP_Profile.h"
#include "tao/Acceptor_Registry.h"
#include "tao/operation_details.h"
#include "tao/Timeprobe.h"
#include "tao/CDR.h"
#include "tao/Transport_Mux_Strategy.h"
#include "tao/Wait_Strategy.h"
#include "tao/Sync_Strategies.h"
#include "tao/Stub.h"
#include "tao/ORB_Core.h"
#include "tao/debug.h"
#include "tao/Resume_Handle.h"
#include "tao/GIOP_Message_Base.h"
// #include "tao/GIOP_Message_Lite.h"

#if !defined (__ACE_INLINE__)
# include "DIOP_Transport.i"
#endif /* ! __ACE_INLINE__ */

ACE_RCSID (tao, DIOP_Transport, "$Id$")

TAO_DIOP_Transport::TAO_DIOP_Transport (TAO_DIOP_Connection_Handler *handler,
                                        TAO_ORB_Core *orb_core,
                                        CORBA::Boolean /*flag*/)
  : TAO_Transport (TAO_TAG_UDP_PROFILE,
                   orb_core)
  , connection_handler_ (handler)
  , messaging_object_ (0)
{
  // @@ Michael: Set the input CDR size to ACE_MAX_DGRAM_SIZE so that
  //             we read the whole UDP packet on a single read.
  /*  if (flag)
    {
      // Use the lite version of the protocol
      ACE_NEW (this->messaging_object_,
               TAO_GIOP_Message_Lite (orb_core,
                                      ACE_MAX_DGRAM_SIZE));
                                      }
                                      else*/
    {
      // Use the normal GIOP object
      ACE_NEW (this->messaging_object_,
               TAO_GIOP_Message_Base (orb_core,
                                      ACE_MAX_DGRAM_SIZE));
    }
}

TAO_DIOP_Transport::~TAO_DIOP_Transport (void)
{
  delete this->messaging_object_;
}

ACE_Event_Handler *
TAO_DIOP_Transport::event_handler_i (void)
{
  return this->connection_handler_;
}

TAO_Pluggable_Messaging *
TAO_DIOP_Transport::messaging_object (void)
{
  return this->messaging_object_;
}

ssize_t
TAO_DIOP_Transport::send_i (iovec *iov, int iovcnt,
                            size_t &bytes_transferred,
                            const ACE_Time_Value *)
{
  const ACE_INET_Addr &addr = this->connection_handler_->addr ();
  ssize_t retval = this->connection_handler_->dgram ().send (iov,
                                                             iovcnt,
                                                             addr);
  if (retval > 0)
    bytes_transferred = retval;

  // @@ Michael:
  // Always return a positive number of bytes sent, as we do
  // not handle sending errors in DIOP.
  return 1;
}

ssize_t
TAO_DIOP_Transport::recv_i (char *buf,
                            size_t len,
                            const ACE_Time_Value * /* max_wait_time */)
{
  ACE_INET_Addr from_addr;

  ssize_t n = this->connection_handler_->dgram ().recv (buf,
                                                        len,
                                                        from_addr);

  if (TAO_debug_level > 0)
    {
      ACE_DEBUG ((LM_DEBUG,
                  "TAO_DIOP_Transport::recv_i: received %d bytes from %s:%d %d\n",
                  n,
                  from_addr.get_host_name (),
                  from_addr.get_port_number (),
                  errno));
    }

  // Most of the errors handling is common for
  // Now the message has been read
  if (n == -1 && TAO_debug_level > 4)
    {
      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("TAO (%P|%t) - %p \n"),
                  ACE_TEXT ("TAO - read message failure ")
                  ACE_TEXT ("recv_i () \n")));
    }

  // Error handling
  if (n == -1)
    {
      if (errno == EWOULDBLOCK)
        return 0;

      return -1;
    }
  // @@ What are the other error handling here??
  else if (n == 0)
    {
      return -1;
    }

  // Remember the from addr to eventually use it as remote
  // addr for the reply.
  this->connection_handler_->addr (from_addr);

  return n;
}

int
TAO_DIOP_Transport::handle_input_i (TAO_Resume_Handle &rh,
                                    ACE_Time_Value *max_wait_time,
                                    int /*block*/)
{
  // If there are no messages then we can go ahead to read from the
  // handle for further reading..

  // The buffer on the stack which will be used to hold the input
  // messages
  char buf [ACE_MAX_DGRAM_SIZE];

#if defined (ACE_HAS_PURIFY)
  (void) ACE_OS::memset (buf,
                         '\0',
                         sizeof buf);
#endif /* ACE_HAS_PURIFY */

  // Create a data block
  ACE_Data_Block db (sizeof (buf),
                     ACE_Message_Block::MB_DATA,
                     buf,
                     this->orb_core_->message_block_buffer_allocator (),
                     this->orb_core_->locking_strategy (),
                     ACE_Message_Block::DONT_DELETE,
                     this->orb_core_->message_block_dblock_allocator ());

  // Create a message block
  ACE_Message_Block message_block (&db,
                                   ACE_Message_Block::DONT_DELETE,
                                   this->orb_core_->message_block_msgblock_allocator ());


  // Align the message block
  ACE_CDR::mb_align (&message_block);


  // Read the message into the  message block that we have created on
  // the stack.
  ssize_t n = this->recv (message_block.rd_ptr (),
                          message_block.space (),
                          max_wait_time);

  // If there is an error return to the reactor..
  if (n <= 0)
    {
      if (n == -1)
        this->tms_->connection_closed ();

      return n;
    }

  // Set the write pointer in the stack buffer
  message_block.wr_ptr (n);

  // Parse the incoming message for validity. The check needs to be
  // performed by the messaging objects.
  if (this->parse_incoming_messages (message_block) == -1)
    return -1;

  // NOTE: We are not performing any queueing nor any checking for
  // missing data. We are assuming that ALL the data would be got in a
  // single read.

  // Make a node of the message block..
  TAO_Queued_Data qd (&message_block);

  // Extract the data for the node..
  this->messaging_object ()->get_message_data (&qd);

  // Resume before starting to process the request..
  rh.resume_handle ();

  // Process the message
  return this->process_parsed_messages (&qd);

}


int
TAO_DIOP_Transport::register_handler_i (void)
{
  // @@ Michael:
  //
  // We do never register register the handler with the reactor
  // as we never need to be informed about any incoming data,
  // assuming we only use one-ways.
  // If we would register and ICMP Messages would arrive, e.g
  // due to a not reachable server, we would get informed - as this
  // disturbs the general DIOP assumptions of not being
  // interested in any network failures, we ignore ICMP messages.
  return 0;
  /*
  // @@ It seems like this method should go away, the right reactor is
  //    picked at object creation time.
  ACE_Reactor *r = this->orb_core_->reactor ();

  if (r == this->connection_handler_->reactor ())
    return 0;

  // Set the flag in the Connection Handler
  this->connection_handler_->is_registered (1);


  // Register the handler with the reactor
  return  r->register_handler (this->connection_handler_,
                               ACE_Event_Handler::READ_MASK);
  */
}


int
TAO_DIOP_Transport::send_request (TAO_Stub *stub,
                                  TAO_ORB_Core *orb_core,
                                  TAO_OutputCDR &stream,
                                  int two_way,
                                  ACE_Time_Value *max_wait_time)
{
  if (this->ws_->sending_request (orb_core,
                                  two_way) == -1)
    return -1;

  if (this->send_message (stream,
                          stub,
                          two_way,
                          max_wait_time) == -1)

    return -1;

  return this->idle_after_send ();
}

int
TAO_DIOP_Transport::send_message (TAO_OutputCDR &stream,
                                  TAO_Stub *stub,
                                  int twoway,
                                  ACE_Time_Value *max_wait_time)
{
  // Format the message in the stream first
  if (this->messaging_object_->format_message (stream) != 0)
    return -1;

  // Strictly speaking, should not need to loop here because the
  // socket never gets set to a nonblocking mode ... some Linux
  // versions seem to need it though.  Leaving it costs little.

  // This guarantees to send all data (bytes) or return an error.
  ssize_t n = this->send_message_i (stub,
                                    twoway,
                                    stream.begin (),
                                    max_wait_time);

  if (n == -1)
    {
      if (TAO_debug_level)
        ACE_DEBUG ((LM_DEBUG,
                    ACE_TEXT ("TAO: (%P|%t|%N|%l) closing transport %d after fault %p\n"),
                    this->id (),
                    ACE_TEXT ("send_message ()\n")));

      return -1;
    }

  return 1;
}



int
TAO_DIOP_Transport::messaging_init (CORBA::Octet major,
                                    CORBA::Octet minor)
{
  this->messaging_object_->init (major,
                                 minor);
  return 1;
}

// @@ Frank: Hopefully DIOP doesn't need this
/*
int
TAO_DIOP_Transport::tear_listen_point_list (TAO_InputCDR &cdr)
{
  CORBA::Boolean byte_order;
  if ((cdr >> ACE_InputCDR::to_boolean (byte_order)) == 0)
    return -1;

  cdr.reset_byte_order (ACE_static_cast(int,byte_order));

  DIOP::ListenPointList listen_list;
  if ((cdr >> listen_list) == 0)
    return -1;

  // As we have received a bidirectional information, set the flag to
  // 1
  this->bidirectional_flag (1);
  return this->connection_handler_->process_listen_point_list (listen_list);
}
*/



// @@ Frank: Hopefully DIOP doesn't need this
/*
void
TAO_DIOP_Transport::set_bidir_context_info (TAO_Operation_Details &opdetails)
{

  // Get a handle on to the acceptor registry
  TAO_Acceptor_Registry * ar =
    this->orb_core ()->acceptor_registry ();


  // Get the first acceptor in the registry
  TAO_AcceptorSetIterator acceptor = ar->begin ();

  DIOP::ListenPointList listen_point_list;

  for (;
       acceptor != ar->end ();
       acceptor++)
    {
      // Check whether it is a DIOP acceptor
      if ((*acceptor)->tag () == TAO_TAG_UDP_PROFILE)
        {
          this->get_listen_point (listen_point_list,
                                  *acceptor);
        }
    }

  // We have the ListenPointList at this point. Create a output CDR
  // stream at this point
  TAO_OutputCDR cdr;

  // Marshall the information into the stream
  if ((cdr << ACE_OutputCDR::from_boolean (TAO_ENCAP_BYTE_ORDER)== 0)
      || (cdr << listen_point_list) == 0)
    return;

  // Add this info in to the svc_list
  opdetails.service_context ().set_context (IOP::BI_DIR_DIOP,
                                            cdr);

  return;
}


int
TAO_DIOP_Transport::get_listen_point (
    DIOP::ListenPointList &listen_point_list,
    TAO_Acceptor *acceptor)
{
  TAO_DIOP_Acceptor *iiop_acceptor =
    ACE_dynamic_cast (TAO_DIOP_Acceptor *,
                      acceptor );

  // Get the array of endpoints serviced by <iiop_acceptor>
  const ACE_INET_Addr *endpoint_addr =
    iiop_acceptor->endpoints ();

  // Get the count
  size_t count =
    iiop_acceptor->endpoint_count ();

  // Get the local address of the connection
  ACE_INET_Addr local_addr;

  if (this->connection_handler_->peer ().get_local_addr (local_addr)
      == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         ACE_TEXT ("(%P|%t) Could not resolve local host")
                         ACE_TEXT (" address in set_bidir_context_info () \n")),
                        -1);
    }


  // Note: Looks like there is no point in sending the list of
  // endpoints on interfaces on which this connection has not
  // been established. If this is wrong, please correct me.
  char *local_interface = 0;

  // Get the hostname for the local address
  if (iiop_acceptor->hostname (this->orb_core_,
                               local_addr,
                               local_interface) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         ACE_TEXT ("(%P|%t) Could not resolve local host")
                         ACE_TEXT (" name \n")),
                        -1);
    }

  ACE_INET_Addr *tmp_addr = ACE_const_cast (ACE_INET_Addr *,
                                            endpoint_addr);

  for (size_t index = 0;
       index <= count;
       index++)
    {
      // Get the listen point on that acceptor if it has the same
      // interface on which this connection is established
      char *acceptor_interface = 0;

      if (iiop_acceptor->hostname (this->orb_core_,
                                   tmp_addr[index],
                                   acceptor_interface) == -1)
          continue;

      // @@ This is very bad for performance, but it is a one time
      // affair
      if (ACE_OS::strcmp (local_interface,
                          acceptor_interface) == 0)
        {
          // We have the connection and the acceptor endpoint on the
          // same interface
          DIOP::ListenPoint point;
          point.host = CORBA::string_dup (local_interface);
          point.port = endpoint_addr[index].get_port_number ();

          // Get the count of the number of elements
          CORBA::ULong len = listen_point_list.length ();

          // Increase the length by 1
          listen_point_list.length (len + 1);

          // Add the new length to the list
          listen_point_list[len] = point;
        }

      // @@ This is bad....
      CORBA::string_free (acceptor_interface);
    }

  CORBA::string_free (local_interface);
  return 1;
}
*/

void
TAO_DIOP_Transport::transition_handler_state_i (void)
{
  this->connection_handler_ = 0;
}

#endif /* TAO_HAS_DIOP && TAO_HAS_DIOP != 0 */