log_wrapper.cpp

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// $Id: Log_Wrapper.cpp 78962 2007-07-20 03:27:14Z sowayaa $

// client.C

#include "Log_Wrapper.h"
#include "ace/OS_NS_unistd.h"
#include "ace/OS_NS_sys_utsname.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_netdb.h"
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_time.h"
#include "ace/OS_NS_stdlib.h"

ACE_RCSID(Multicast, Log_Wrapper, "$Id: Log_Wrapper.cpp 78962 2007-07-20 03:27:14Z sowayaa $")

Log_Wrapper::Log_Wrapper (void)
{
  sequence_number_ = 0;
  this->log_msg_.app_id = ACE_OS::getpid ();
}

Log_Wrapper::~Log_Wrapper (void)
{
}

// Set the log_msg_ host address.

int
Log_Wrapper::open (const int port, const char *mcast_addr)
{
  struct hostent *host_info;
  ACE_utsname host_data;

  if (ACE_OS::uname (&host_data) < 0)
    return -1;

  if ((host_info = ACE_OS::gethostbyname (host_data.nodename)) == 0)
    return -1;
  else
    ACE_OS::memcpy ((char *) &this->log_msg_.host,
                    (char *) host_info->h_addr,
                    host_info->h_length);

  // This starts out initialized to all zeros!
  server_ = ACE_INET_Addr (port, mcast_addr);

  if (logger_.subscribe (server_) == -1)
    ACE_OS::perror("can't subscribe to multicast group"), ACE_OS::exit(1);

  // success.
  return 0;
}

// Send the message to a logger object.
// This wrapper fills in all the log_record info for you.
// uses iovector stuff to make contiguous header and message.

int
Log_Wrapper::log_message (Log_Priority type, char *message)
{
  sequence_number_++;

  this->log_msg_.type = type;
  // Casting time() to long will start causing bad results sometime in 2038
  // but the receiver isn't looking at the time, so who cares?
  this->log_msg_.time = (long) ACE_OS::time (0);
  this->log_msg_.msg_length = ACE_OS::strlen(message)+1;
  this->log_msg_.sequence_number = ACE_HTONL(sequence_number_);

  iovec iovp[2];
  iovp[0].iov_base = reinterpret_cast<char*> (&log_msg_);
  iovp[0].iov_len  = sizeof (log_msg_);
  iovp[1].iov_base = message;
  iovp[1].iov_len  = log_msg_.msg_length;

  logger_.send (iovp, 2);

  // success.
  return 0;
}