path: root/TAO/tao/Connect.cpp

// $Id$

#include "tao/corba.h"
#include "tao/Timeprobe.h"

TAO_Server_Connection_Handler::TAO_Server_Connection_Handler (ACE_Thread_Manager* t)
  : TAO_SVC_HANDLER (t, 0, 0)
{
  // Grab the singleton...at some later point in time we can provide
  // an argumented CTOR to have per-instance parameters.

  this->params_ = TAO_ORB_Core_instance ()->oa_params ();
  ACE_ASSERT (params_ != 0);
}

int
TAO_Server_Connection_Handler::open (void*)
{
  // Called by the <Strategy_Acceptor> when the handler is completely
  // connected.
  ACE_INET_Addr addr;

  if (this->peer ().get_remote_addr (addr) == -1)
    return -1;

#if !defined (ACE_LACKS_SOCKET_BUFSIZ)
  int sndbufsize =
    TAO_ORB_Core_instance ()->orb_params ()->sock_sndbuf_size ();
  int rcvbufsize =
    TAO_ORB_Core_instance ()->orb_params ()->sock_rcvbuf_size ();

  if (this->peer ().set_option (SOL_SOCKET,
                                SO_SNDBUF,
                                (void *) &sndbufsize,
                                sizeof (sndbufsize)) == -1
      && errno != ENOTSUP)
    return -1;
  else if (this->peer ().set_option (SOL_SOCKET,
                                     SO_RCVBUF,
                                     (void *) &rcvbufsize,
                                     sizeof (rcvbufsize)) == -1
           && errno != ENOTSUP)
    return -1;
#endif /* !ACE_LACKS_SOCKET_BUFSIZ */

#if defined (TCP_NODELAY)
  int nodelay = 1;
  if (this->peer ().set_option (IPPROTO_TCP,
				TCP_NODELAY,
				(void *) &nodelay,
				sizeof (nodelay)) == -1)
    return -1;
#endif /* TCP_NODELAY */

  char client[MAXHOSTNAMELEN + 1];

  if (addr.get_host_name (client, MAXHOSTNAMELEN) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "(%P|%t) %p\n",
                       "get_host_name"),
                      -1);

  ACE_DEBUG ((LM_DEBUG,
	      "(%P|%t) connection from client %s\n",
	      client));
  return 0;
}

int
TAO_Server_Connection_Handler::handle_close (ACE_HANDLE handle,
                                             ACE_Reactor_Mask rm)
{
  ACE_DEBUG  ((LM_DEBUG,
	       "(%P|%t) TAO_Server_Connection_Handler::handle_close (%d, %d)\n",
	       handle,
               rm));

  return TAO_SVC_HANDLER::handle_close (handle, rm);
}

int
TAO_Server_Connection_Handler::svc (void)
{
  // This method is called when an instance is "activated", i.e.,
  // turned into an active object.  Presumably, activation spawns a
  // thread with this method as the "worker function".
  int result = 0;

  ACE_DEBUG ((LM_DEBUG,
              "(%P|%t) TAO_Server_Connection_Handler::svc begin\n"));

  // Here we simply synthesize the "typical" event loop one might find
  // in a reactive handler, except that this can simply block waiting
  // for input.

  while ((result = handle_input ()) >= 0)
    continue;

  ACE_DEBUG  ((LM_DEBUG,
               "(%P|%t) TAO_Server_Connection_Handler::svc end\n"));

  return result;
}

// Extract a message from the stream associated with <peer()> and
// place it into <msg>.  Return 0 if success, -1 with <errno> and
// <env> set if problems.

TAO_Server_Connection_Handler::RequestStatus
TAO_Server_Connection_Handler::recv_request (CDR &msg,
                                             CORBA::Environment &env)
{
  RequestStatus which = Error;

  TAO_SVC_HANDLER *this_ptr = this;

  switch (TAO_GIOP::recv_request (this_ptr, msg, env))
    {
    case TAO_GIOP::Request:
      // Received a request...just exit for further processing!
      which = Request;
      break;

    case TAO_GIOP::LocateRequest:
      // Received a request...just exit for further processing!
      which = LocateRequest;
      break;

      // These messages should never be sent to the server; it's an
      // error if the peer tries.  Set the environment accordingly, as
      // it's not yet been reported as an error.
    case TAO_GIOP::Reply:
    case TAO_GIOP::LocateReply:
    case TAO_GIOP::CloseConnection:
    default:					// Unknown message
      ACE_DEBUG ((LM_DEBUG,
                  "(%P|%t) Illegal message received by server\n"));
      env.exception (new CORBA::COMM_FAILURE (CORBA::COMPLETED_NO));
      // FALLTHROUGH

    case TAO_GIOP::EndOfFile:
      errno = EPIPE;
      // FALLTHROUGH

      // recv_request () has already set some error in the environment
      // for all "MessageError" cases, so don't clobber it.
      //
      // General error recovery is to send MessageError to the peer
      // just in case (it'll fail on EOF) and then close the
      // connection.
    case TAO_GIOP::MessageError:
      break;
    }

  return which;
}

// Handle processing of the request residing in <msg>, setting
// <response_required> to zero if the request is for a oneway or
// non-zero if for a two-way and <response> to any necessary response
// (including errors).  In case of errors, -1 is returned and
// additional information carried in <env>.

int
TAO_Server_Connection_Handler::handle_message (CDR &msg,
                                               int &response_required,
                                               CDR &response,
                                               CORBA::Environment &env)
{
  // This will extract the request header, set <response_required> as
  // appropriate.
  TAO_GIOP_RequestHeader req;

  env.clear ();
  if (! req.init (msg, env))
    {
      env.exception (new CORBA::COMM_FAILURE (CORBA::COMPLETED_MAYBE));
      return -1;
    }

  response_required = req.response_expected;

  // So, we read a request, now handle it using something more
  // primitive than a CORBA2 ServerRequest pseudo-object.

  // @@ (CJC) We need to create a TAO-specific request which will hold
  // context for a request such as the connection handler ("this") over
  // which the request was received so that the servicer of the request
  // has sufficient context to send a response on its own.
  //
  // One thing which me must be careful of is that responses are sent
  // with a single write so that they're not accidentally interleaved
  // over the transport (as could happen using TCP).
  this->handle_request (req, msg, response, 0, env);

  CORBA::string_free (req.operation);
  req.operation = 0;

  // Need to check for any errors present in <env> and set the return
  // code appropriately.
  return 0;
}

int
TAO_Server_Connection_Handler::handle_locate (CDR &msg,
                                              int &response_required,
                                              CDR &response,
                                              CORBA::Environment &env)
{
  // This will extract the request header, set <response_required> as
  // appropriate.
  TAO_GIOP_LocateRequestHeader req;

  env.clear ();
  if (! req.init (msg, env))
    {
      // @@ FIXME! Need to set <env>.
      response_required = 0;
      return -1;
    }

  response_required = 1; // Be optimistic

  // So, we read a request, now handle it using something more
  // primitive than a CORBA2 ServerRequest pseudo-object.
  TAO_POA *the_poa = TAO_ORB_Core_instance ()->root_poa ();
  TAO_GIOP_LocateStatusType status;

  if ((the_poa->locate_servant (req.object_key, env) == 0)
      && (env.exception() == 0))
    // We found it!
    status = TAO_GIOP_OBJECT_HERE;
  else
    {
      // not found, report unknown
      status = TAO_GIOP_UNKNOWN_OBJECT;

      // Remove the exception
      env.clear ();
    }

  // Create the response.
  TAO_GIOP::start_message (TAO_GIOP::LocateReply, response);
  response.put_ulong (req.request_id);
  response.put_ulong (status);

  // Need to check for any errors present in <env> and set the return
  // code appropriately.
  return 0;
}

void
TAO_Server_Connection_Handler::handle_request (const TAO_GIOP_RequestHeader &hdr,
                                               CDR &request_body,
                                               CDR &response,
                                               TAO_Dispatch_Context *some_info,
                                               CORBA::Environment &env)
{
  ACE_UNUSED_ARG (some_info);

  TAO_POA *the_poa =
    TAO_ORB_Core_instance ()->root_poa ();

  IIOP_ServerRequest svr_req (hdr,
                              &request_body,
                              &response,
                              TAO_ORB_Core_instance ()->orb (),
                              the_poa);

  the_poa->dispatch_servant (hdr.object_key,
                             svr_req,
                             0, // this is SunSoft IIOP residue
                             env);

#if 0
  // @@ (ASG) - this commented out code must remain here since the DSI will use
  // it. Please keep it here until I have figured out the best way out 03/22/98.

  // If no reply is necessary (i.e., oneway), then return!
  if (hdr.response_expected == 0)
    return;

  // Otherwise check for correct parameter handling, and reply as
  // appropriate.
  //
  // NOTE: if "env" is set, it takes precedence over exceptions
  // reported using the mechanism of the ServerRequest.  Only system
  // exceptions are reported that way ...
  //
  // XXX Exception reporting is ambiguous; it can be cleaner than
  // this.  With both language-mapped and dynamic/explicit reporting
  // mechanisms, one of must be tested "first" ... so an exception
  // reported using the other mechanism could be "lost".  Perhaps only
  // the language mapped one should be used for system exceptions.

  TAO_GIOP::start_message (TAO_GIOP_Reply, response);
  TAO_GIOP_ServiceContextList resp_ctx;
  resp_ctx.length (0);
  response.encode (&TC_ServiceContextList,
                   &resp_ctx,
                   0,
                   env);
  response.put_ulong (hdr.request_id);

  CORBA::TypeCode_ptr tc;
  const void *value;

  if (!svr_req.params_ && env.exception () == 0)
    {
      dmsg ("DSI user error, didn't supply params");
      env.exception (new CORBA::BAD_INV_ORDER (CORBA::COMPLETED_NO));
    }

  // Standard exceptions only.
  if (env.exception () != 0)
    {
      CORBA::Environment env2;
      CORBA::Exception *x = env.exception ();
      CORBA::TypeCode_ptr except_tc = x->type ();

      response.put_ulong (TAO_GIOP_SYSTEM_EXCEPTION);
      (void) response.encode (except_tc, x, 0, env2);
    }

  // Any exception at all.
  else if (svr_req.exception_)
    {
      CORBA::Exception *x;
      CORBA::TypeCode_ptr except_tc;

      x = (CORBA::Exception *) svr_req.exception_->value ();
      except_tc = svr_req.exception_->type ();

      // Finish the GIOP Reply header, then marshal the exception.
      //
      // XXX x->type () someday ...
      if (svr_req.ex_type_ == CORBA::SYSTEM_EXCEPTION)
        response.put_ulong (TAO_GIOP_SYSTEM_EXCEPTION);
      else
        response.put_ulong (TAO_GIOP_USER_EXCEPTION);

      (void) response.encode (except_tc, x, 0, env);
    }

  // Normal reply.
  else
    {
      // First finish the GIOP header ...
      response.put_ulong (TAO_GIOP_NO_EXCEPTION);

      // ... then send any return value ...
      if (svr_req.retval_)
        {
          tc = svr_req.retval_->type ();
          value = svr_req.retval_->value ();
          (void) response.encode (tc, value, 0, env);
        }

      // ... Followed by "inout" and "out" parameters, left to right
      for (u_int i = 0;
           i < svr_req.params_->count ();
           i++)
        {
          CORBA::NamedValue_ptr	nv = svr_req.params_->item (i, env);
          CORBA::Any_ptr any;

          if (!(nv->flags () & (CORBA::ARG_INOUT|CORBA::ARG_OUT)))
            continue;

          any = nv->value ();
          tc = any->type ();
          value = any->value ();
          (void) response.encode (tc, value, 0, env);
        }
    }
#endif /* 0 */
}

void
TAO_Server_Connection_Handler::send_response (CDR &msg)
{
  TAO_SVC_HANDLER *this_ptr = this;

  ACE_TIMEPROBE ("  -> Connection_Handler::send_response - start");
  TAO_GIOP::send_request (this_ptr, msg);
  ACE_TIMEPROBE ("  -> Connection_Handler::send_response - end");
}

int
TAO_Server_Connection_Handler::handle_input (ACE_HANDLE)
{
  // CJCXXX The tasks of this method should change to something like
  // the following:
  // 1. call into GIOP to pull off the header
  // 2. construct a complete request
  // 3. dispatch that request and return any required reply and errors

  ACE_TIMEPROBE ("  -> Connection_Handler::handle_input");

  char reqbuf[CDR::DEFAULT_BUFSIZE];
  CDR msg (reqbuf, sizeof(reqbuf));

  char repbuf[CDR::DEFAULT_BUFSIZE];
#if defined(ACE_PURIFY)
  (void) ACE_OS::memset (repbuf, '\0', sizeof (repbuf));
#endif /* ACE_PURIFY */
  CDR reply (repbuf, sizeof(repbuf));

  int result = 0;
  int error_encountered = 0;
  int response_required;
  CORBA::Environment env;

  switch (this->recv_request (msg, env))
    {
    case Request:
      // Message was successfully read, so handle it.  If we encounter
      // any errors, <reply> will be set appropriately by the called
      // code, and -1 will be returned.
      if (this->handle_message (msg, response_required, reply, env) == -1)
        error_encountered = 1;
      break;

    case LocateRequest:
      if (this->handle_locate (msg, response_required, reply, env) == -1)
        error_encountered = 1;
      break;

    case -1:
      // Check errno and/or env for details
      if (env.exception ())
        {
          TAO_GIOP::make_error (reply /* ...other information... */ );
          error_encountered = 1;
          // Of course, we must be careful to properly process
          // end-of-file and other communications-related conditions
          // here so that handle_input() returns the correct value.
        }
      else if (errno == EPIPE)
        {
          // Got a EOF
          response_required = error_encountered = 0;
          result = -1;
        }
      break;
    }

  // Message was successfully read, so handle it.  If we encounter
  // any errors, <reply> will be set appropriately by the called
  // code, and -1 will be returned.

  if (response_required || error_encountered)
    this->send_response (reply);

  ACE_TIMEPROBE ("  -> Connection_Handler::handle_input done");
  return result;
}

TAO_Client_Connection_Handler::TAO_Client_Connection_Handler (ACE_Thread_Manager *t)
  : TAO_SVC_HANDLER (t, 0, 0),
    input_available_ (0)
{
}

int
TAO_Client_Connection_Handler::open (void *)
{
  // Here is where we could enable all sorts of things such as
  // nonblock I/O, sock buf sizes, TCP no-delay, etc.

#if !defined (ACE_LACKS_SOCKET_BUFSIZ)
  int sndbufsize =
    TAO_ORB_Core_instance ()->orb_params ()->sock_sndbuf_size ();
  int rcvbufsize =
    TAO_ORB_Core_instance ()->orb_params ()->sock_rcvbuf_size ();

  if (this->peer ().set_option (SOL_SOCKET,
                                SO_SNDBUF,
                                (void *) &sndbufsize,
                                sizeof (sndbufsize)) == -1
      && errno != ENOTSUP)
    return -1;
  else if (this->peer ().set_option (SOL_SOCKET,
                                     SO_RCVBUF,
                                     (void *) &rcvbufsize,
                                     sizeof (rcvbufsize)) == -1
           && errno != ENOTSUP)
    return -1;
#endif /* ACE_LACKS_SOCKET_BUFSIZ */

  int nodelay = 1;
  if (this->peer ().set_option (IPPROTO_TCP,
				TCP_NODELAY,
				(void *) &nodelay,
				sizeof (nodelay)) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "NODELAY failed\n"), -1);

  ACE_Reactor *r = TAO_ORB_Core_instance ()->reactor ();

  // Now we must register ourselves with the reactor for input events
  // which will detect GIOP Reply messages and EOF conditions.
  r->register_handler (this, ACE_Event_Handler::READ_MASK);

  // For now, we just return success
  return 0;
}

int
TAO_Client_Connection_Handler::close (u_long flags)
{
  ACE_Reactor *r = TAO_ORB_Core_instance ()->reactor ();

  // Now we must register ourselves with the reactor for input events
  // which will detect GIOP Reply messages and EOF conditions.
  r->remove_handler (this, ACE_Event_Handler::DONT_CALL);

  return BASECLASS::close (flags);
}

int
TAO_Client_Connection_Handler::send_request (CDR &stream, int is_twoway)
{
  ACE_TIMEPROBE ("  -> Client_Connection_Handler::send_request - start");

  // NOTE: Here would also be a fine place to calculate a digital
  // signature for the message and place it into a preallocated slot
  // in the "ServiceContext".  Similarly, this is a good spot to
  // encrypt messages (or just the message bodies) if that's needed in
  // this particular environment and that isn't handled by the
  // networking infrastructure (e.g. IPSEC).
  //
  // We could call a template method to do all this stuff, and if the
  // connection handler were obtained from a factory, then this could
  // be dynamically linked in (wouldn't that be cool/freaky?)

  int success  = (int) TAO_GIOP::send_request (this, stream);

  if (!success)
    return -1;

  if (is_twoway)
    {
      // Set the state so that we know we're looking for a response.
      this->expecting_response_ = 1;

      // Go into a loop, waiting until it's safe to try to read
      // something on the soket.  The handle_input() method doesn't
      // actualy do the read, though, proper behavior based on what is
      // read may be different if we're not using GIOP above here.
      // So, we leave the reading of the response to the caller of
      // this method, and simply insure that this method doesn't
      // return until such time as doing a recv() on the socket would
      // actually produce fruit.
      ACE_Reactor *r = TAO_ORB_Core_instance ()->reactor ();

      int ret = 0;

      while (ret != -1 && ! this->input_available_)
        ret = r->handle_events ();

      this->input_available_ = 0;
      // We can get events now, b/c we want them!
      r->resume_handler (this);
      // We're no longer expecting a response!
      this->expecting_response_ = 0;
    }

  ACE_TIMEPROBE ("  -> Client_Connection_Handler::send_request - done");
  return 0;
}

int
TAO_Client_Connection_Handler::handle_input (ACE_HANDLE)
{
  int retval = 0;

  if (this->expecting_response_)
    {
      this->input_available_ = 1;
      // Temporarily remove ourself from notification so that if
      // another sub event loop is in effect still waiting for its
      // response, it doesn't spin tightly gobbling up CPU.
      TAO_ORB_Core_instance ()->reactor ()->suspend_handler (this);
    }
  else
    {
      // We're a client, so we're not expecting to see input.  Still
      // we better check what it is!
      char ignored;
      ssize_t ret = this->peer().recv (&ignored, sizeof ignored, MSG_PEEK);

      // We're not expecting input at this time, so we'll always
      // return -1 for now.
      retval = -1;
      switch (ret)
        {
        case -1:
          // Error...but we weren't expecting input, either...what
          // should we do?
          ACE_ERROR ((LM_WARNING,
                      "Client_Connection_Handler::handle_input received "
                      "error while reading unexpected input; closing connection on fd %d\n",
                      this->peer().get_handle ()));
          break;

        case 1:
          // We weren't expecting input, so what should we do with it?
          // Log an error, and close the connection.
          ACE_ERROR ((LM_WARNING,
                      "Client_Connection_Handler::handle_input received "
                      "input while not expecting a response; closing connection on fd %d\n",
                      this->peer().get_handle ()));
          break;

        case 0:
          // This is an EOF, so we will return -1 and let
          // handle_close() take over.  As long as handle_close()
          // calls the Svc_Handler<>::handle_close(), the socket will
          // be shutdown properly.
          break;
        }
    }

  return retval;
}

int
TAO_Client_Connection_Handler::handle_close (ACE_HANDLE handle,
                                             ACE_Reactor_Mask rm)
{
  ACE_DEBUG  ((LM_DEBUG,
	       "(%P|%t) TAO_Client_Connection_Handler::handle_close (%d, %d)\n",
	       handle,
               rm));

  return BASECLASS::handle_close (handle, rm);
}

#define TAO_SVC_TUPLE ACE_Svc_Tuple<TAO_Client_Connection_Handler>
#define TAO_HASH_ADDR ACE_Hash_Addr<ACE_INET_Addr>
#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>;
template class TAO_HASH_ADDR;
template class TAO_SVC_TUPLE;
template class ACE_Map_Manager<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>;
template class ACE_Map_Iterator_Base<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>;
template class ACE_Map_Iterator<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>;
template class ACE_Map_Reverse_Iterator<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>;
template class ACE_Map_Entry<int, TAO_SVC_TUPLE*>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>
#pragma instantiate TAO_HASH_ADDR
#pragma instantiate TAO_SVC_TUPLE
#pragma instantiate ACE_Map_Manager<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>
#pragma instantiate ACE_Map_Iterator_Base<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>
#pragma instantiate ACE_Map_Iterator<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>
#pragma instantiate ACE_Map_Reverse_Iterator<int, TAO_SVC_TUPLE*, ACE_SYNCH_RW_MUTEX>
#pragma instantiate ACE_Map_Entry<int, TAO_SVC_TUPLE*>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */