//=============================================================================
/**
 *  @file    Reactor_Performance_Test.cpp
 *
 *  This test is used to time the dispatching mechanisms of the
 *  <ACE_Reactor>s. Both the <ACE_WFMO_Reactor> and
 *  <ACE_Select_Reactor> can be tested.
 *
 *  @author Irfan Pyarali <irfan@cs.wustl.edu>
 */
//=============================================================================

#include "test_config.h"
#include "Reactor_Performance_Test.h"

#include "ace/Acceptor.h"
#include "ace/Auto_Ptr.h"
#include "ace/Connector.h"
#include "ace/Get_Opt.h"
#include "ace/Profile_Timer.h"
#include "ace/Reactor.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/SOCK_Connector.h"
#include "ace/Select_Reactor.h"
#include "ace/WFMO_Reactor.h"
#include <utility>

#if defined (ACE_HAS_THREADS) && !defined ACE_LACKS_ACCEPT

static const char ACE_ALPHABET[] = "abcdefghijklmnopqrstuvwxyz";

// Number of client (user) threads
static int opt_nconnections = 5;

// Number of data exchanges
static int opt_nloops = 200;

// Use the WFMO_Reactor
static int opt_wfmo_reactor = 0;

// Use the Select_Reactor
static int opt_select_reactor = 0;

// Extra debug messages
static int opt_debug = 0;

int Read_Handler::waiting_ = 0;

void
Read_Handler::set_countdown (int nconnections)
{
  Read_Handler::waiting_ = nconnections;
}

// Initialize the Svc_Handler
int
Read_Handler::open (void *)
{
  if (this->peer ().enable (ACE_NONBLOCK) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%t) Read_Handler::open, cannot set non blocking mode\n")),
                      -1);

  if (reactor ()->register_handler (this, READ_MASK) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%t) Read_Handler::open, cannot register handler\n")),
                      -1);

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) created svc_handler for handle %d\n"),
              get_handle ()));
  return 0;
}

// Handle incoming data
int
Read_Handler::handle_input (ACE_HANDLE handle)
{
  ACE_UNUSED_ARG (handle);
  char buf[BUFSIZ];

  while (1)
    {
      ssize_t result = this->peer ().recv (buf, sizeof (buf) - 1);

      if (result > 0)
        {
          if (opt_debug)
            {
              buf[result] = 0;
              ACE_DEBUG ((LM_DEBUG,
                          ACE_TEXT ("(%t) Read_Handler::handle_input: %s\n"),
                          buf));
            }
        }
      else if (result < 0)
        {
          if (errno == EWOULDBLOCK)
            return 0;
          else
            {
              ACE_ERROR ((LM_ERROR, ACE_TEXT ("handle_input: %p (errno: %d)\n"),
                          ACE_TEXT ("recv"), ACE_ERRNO_GET));

              // This will cause handle_close to get called.
              return -1;
            }
        }
      else // result == 0
        {
          // This will cause handle_close to get called.
          return -1;
        }
    }

  ACE_NOTREACHED (return 0);
}

// Handle connection shutdown.

int
Read_Handler::handle_close (ACE_HANDLE handle,
                            ACE_Reactor_Mask close_mask)
{
  ACE_UNUSED_ARG (handle);
  ACE_UNUSED_ARG (close_mask);

  // Reduce count.
  waiting_--;

  // If no connections are open.
  if (waiting_ == 0)
    ACE_Reactor::instance ()->end_reactor_event_loop ();

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) Read_Handler::handle_close closing down\n")));

  // Shutdown
  this->destroy ();
  return 0;
}

int
Write_Handler::open (void *)
{
  return 0;
}

int
Write_Handler::send_data ()
{
  int send_size = sizeof (ACE_ALPHABET) - 1;

  if (this->peer ().send_n (ACE_ALPHABET,
                            send_size) != send_size)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%t) %p\n"),
                       ACE_TEXT ("send_n")),
                      -1);
  return 0;
}

// Connection factories
using CONNECTOR = ACE_Connector<Write_Handler, ACE_SOCK_Connector>;
using ACCEPTOR = ACE_Acceptor<Read_Handler, ACE_SOCK_Acceptor>;

// Execute the client tests.
void *
client (void *arg)
{
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) running client\n")));

  ACE_INET_Addr *connection_addr =
    reinterpret_cast<ACE_INET_Addr *> (arg);
  CONNECTOR connector;

  int i;

  // Automagic memory cleanup.
  Write_Handler **temp_writers = 0;
  ACE_NEW_RETURN (temp_writers,
                  Write_Handler *[opt_nconnections],
                  0);
  ACE_Auto_Basic_Array_Ptr <Write_Handler *> writers (temp_writers);

  ACE_TCHAR *temp_failed = 0;
  ACE_NEW_RETURN (temp_failed,
                  ACE_TCHAR[opt_nconnections],
                  0);
  ACE_Auto_Basic_Array_Ptr <ACE_TCHAR> failed_svc_handlers (temp_failed);

  // Automagic memory cleanup.
  ACE_INET_Addr *temp_addresses;
  ACE_NEW_RETURN (temp_addresses,
                  ACE_INET_Addr [opt_nconnections],
                  0);
  ACE_Auto_Array_Ptr <ACE_INET_Addr> addresses (temp_addresses);

  // Initialize array.
  for (i = 0; i < opt_nconnections; i++)
    {
      writers[i] = 0;
      addresses[i] = *connection_addr;
    }

  // Connection all <opt_nconnections> svc_handlers
  int result = connector.connect_n (opt_nconnections,
                                    writers.get (),
                                    addresses.get (),
                                    failed_svc_handlers.get ());
  if (result == -1)
    {
      // Print out the connections that failed...
      for (i = 0; i < opt_nconnections; i++)
        if (failed_svc_handlers.get ()[i])
          {
            ACE_INET_Addr failed_addr = addresses.get()[i];
            ACE_ERROR ((LM_ERROR,
                        ACE_TEXT ("(%t) connection failed to %s, %d\n"),
                        failed_addr.get_host_name (),
                        failed_addr.get_port_number ()));
          }
      return 0;
    }

  // If no connections failed (result == 0) then there should be valid
  // ACE_Svc_handler pointers in each writers[] position.  Iterate to
  // send data
  for (int j = 0; j < opt_nloops; j++)
    for (i = 0; i < opt_nconnections; i++)
      if (writers[i]->send_data () == -1)
        ACE_ERROR_RETURN ((LM_ERROR,
                           ACE_TEXT ("(%t) %p\n"),
                           ACE_TEXT ("writer::send_data")),
                          0);
  // Cleanup
  for (i = 0; i < opt_nconnections; i++)
    writers[i]->destroy ();

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) finishing client\n")));
  return 0;
}

// Sets up the correct reactor (based on platform and options).

void
create_reactor ()
{
  ACE_Reactor_Impl *impl = 0;

  if (opt_wfmo_reactor)
    {
#if defined (ACE_HAS_WINSOCK2) && (ACE_HAS_WINSOCK2 == 1)
      ACE_NEW (impl,
               ACE_WFMO_Reactor);
#endif /* ACE_HAS_WINSOCK2 == 1 */
    }
  else if (opt_select_reactor)
    ACE_NEW (impl,
             ACE_Select_Reactor);

  ACE_Reactor *reactor = 0;
  ACE_NEW (reactor,
           ACE_Reactor (impl));
  ACE_Reactor::instance (reactor);
}

// Print stats.

void
print_results (ACE_Profile_Timer::ACE_Elapsed_Time &et)
{
  const ACE_TCHAR *reactor_type = 0;

  if (opt_wfmo_reactor)
    reactor_type = ACE_TEXT ("WFMO_Reactor");
  else if (opt_select_reactor)
    reactor_type = ACE_TEXT ("Select_Reactor");
  else
    reactor_type = ACE_TEXT ("Platform's default Reactor");

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\n\tReactor_Performance Test statistics:\n\n")));
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\tReactor Type: %s\n"),
              reactor_type));
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\tConnections: %d\n"),
              opt_nconnections));
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\tIteration per connection: %d\n"),
              opt_nloops));

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\n\tTiming results:\n")));
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("\t\treal time = %f secs \n\t\tuser time = %f secs \n\t\tsystem time = %f secs\n\n"),
              et.real_time,
              et.user_time,
              et.system_time));
}

int
run_main (int argc, ACE_TCHAR *argv[])
{
  ACE_START_TEST (ACE_TEXT ("Reactor_Performance_Test"));

  //FUZZ: disable check_for_lack_ACE_OS
  ACE_Get_Opt getopt (argc, argv, ACE_TEXT ("dswc:l:"), 1);
  for (int c; (c = getopt ()) != -1; )
  //FUZZ: enble check_for_lack_ACE_OS
    switch (c)
      {
      case 's':
        opt_select_reactor = 1;
        break;
      case 'w':
        opt_wfmo_reactor = 1;
        break;
      case 'c':
        opt_nconnections = ACE_OS::atoi (getopt.opt_arg ());
        break;
      case 'l':
        opt_nloops = ACE_OS::atoi (getopt.opt_arg ());
        break;
      case 'd':
        opt_debug = 1;
        break;
      }

  // Sets up the correct reactor (based on platform and options).
  create_reactor ();

  // Manage memory automagically.
  std::unique_ptr<ACE_Reactor> reactor (ACE_Reactor::instance ());
  std::unique_ptr<ACE_Reactor_Impl> impl;

  // If we are using other that the default implementation, we must
  // clean up.
  if (opt_select_reactor || opt_wfmo_reactor)
    {
      std::unique_ptr<ACE_Reactor_Impl> auto_impl (ACE_Reactor::instance ()->implementation ());
      impl = std::move(auto_impl);
    }

  Read_Handler::set_countdown (opt_nconnections);

  // Acceptor
  ACCEPTOR acceptor;
  ACE_INET_Addr server_addr;

  // Bind acceptor to any port and then find out what the port was.
  ACE_INET_Addr local_addr (ACE_sap_any_cast (const ACE_INET_Addr &));
  if (acceptor.open (local_addr) == -1
      || acceptor.acceptor ().get_local_addr (server_addr) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       ACE_TEXT ("(%t) %p\n"),
                       ACE_TEXT ("open")),
                      -1);

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) starting server at port %d\n"),
              server_addr.get_port_number ()));

  ACE_INET_Addr connection_addr (server_addr.get_port_number (),
                                 ACE_DEFAULT_SERVER_HOST);

  if (ACE_Thread_Manager::instance ()->spawn
      (ACE_THR_FUNC (client),
       (void *) &connection_addr,
       THR_NEW_LWP | THR_DETACHED) == -1)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("(%t) %p\n"),
                ACE_TEXT ("thread create failed")));

  ACE_Time_Value run_limit (opt_nloops / 10);

  ACE_Profile_Timer timer;
  timer.start ();
  const int status =
    ACE_Reactor::instance ()->run_reactor_event_loop (run_limit);
  timer.stop ();

  ACE_Profile_Timer::ACE_Elapsed_Time et;
  timer.elapsed_time (et);

  // Print results
  print_results (et);

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("(%t) waiting for the client thread...\n")));

  ACE_Thread_Manager::instance ()->wait ();

  ACE_END_TEST;
  return status;
}

#else
int
run_main (int, ACE_TCHAR *[])
{
  ACE_START_TEST (ACE_TEXT ("Reactor_Performance_Test"));

  ACE_ERROR ((LM_INFO,
              ACE_TEXT ("threads/accept not supported on this platform\n")));

  ACE_END_TEST;
  return 0;
}
#endif /* ACE_HAS_THREADS && ! ACE_LACKS_ACCEPT */