/****************************************************************
 *								*
 *	Copyright 2006, 2010 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"

#include "gtm_string.h"
#include "gtm_stdio.h"

#if !defined(__MVS__) && !defined(VMS)
#include <sys/param.h>
#endif

#include <sys/time.h>
#include "gtm_inet.h"
#include <errno.h>

#ifdef VMS
#include <descrip.h> /* Required for gtmsource.h */
#endif

#include "error.h"
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "repl_dbg.h"
#include "repl_shutdcode.h"
#include "repl_sem.h"
#include "util.h"
#include "repl_log.h"
#include "is_proc_alive.h"

GBLREF	jnlpool_addrs		jnlpool;
GBLREF	gtmsource_options_t	gtmsource_options;
GBLREF	boolean_t		holds_sem[NUM_SEM_SETS][NUM_SRC_SEMS];

int gtmsource_showbacklog(void)
{
	seq_num			seq_num, jnl_seqno, read_jnl_seqno;
	gtmsource_local_ptr_t	gtmsourcelocal_ptr;
	int4			index;
	boolean_t		srv_alive;
	uint4			gtmsource_pid;

	error_def(ERR_SRCSRVNOTEXIST);

	assert(holds_sem[SOURCE][JNL_POOL_ACCESS_SEM]);
	jnl_seqno = jnlpool.jnlpool_ctl->jnl_seqno;
	if (NULL != jnlpool.gtmsource_local)	/* Show backlog for a specific source server */
		gtmsourcelocal_ptr = jnlpool.gtmsource_local;
	else
		gtmsourcelocal_ptr = &jnlpool.gtmsource_local_array[0];
	for (index = 0; index < NUM_GTMSRC_LCL; index++, gtmsourcelocal_ptr++)
	{
		if ('\0' == gtmsourcelocal_ptr->secondary_instname[0])
		{
			assert(NULL == jnlpool.gtmsource_local);
			continue;
		}
		/* If SHOWBACKLOG on a specific secondary instance is requested, print the backlog information irrespective
		 * of whether a source server for that instance is alive or not. For SHOWBACKLOG on ALL secondary instances
		 * print backlog information only for those instances that have an active or passive source server alive.
		 */
		gtmsource_pid = gtmsourcelocal_ptr->gtmsource_pid;
		if ((NULL == jnlpool.gtmsource_local) && (0 == gtmsource_pid))
			continue;
		repl_log(stderr, TRUE, TRUE,
			"Initiating SHOWBACKLOG operation on source server pid [%d] for secondary instance [%s]\n",
			gtmsource_pid, gtmsourcelocal_ptr->secondary_instname);
		read_jnl_seqno = gtmsourcelocal_ptr->read_jnl_seqno;
		/* jnl_seqno >= read_jnl_seqno is the most common case; see gtmsource_readpool() for when the rare case can occur */
		seq_num = (jnl_seqno >= read_jnl_seqno) ? jnl_seqno - read_jnl_seqno : 0;
		util_out_print("!@UQ : backlog number of transactions written to journal pool and "
				"yet to be sent by the source server", TRUE, &seq_num);
		seq_num = jnl_seqno;
		if (0 != seq_num)
			seq_num--;
		util_out_print("!@UQ : sequence number of last transaction written to journal pool", TRUE, &seq_num);
		seq_num = read_jnl_seqno;
		if (0 != seq_num)
			seq_num--;
		util_out_print("!@UQ : sequence number of last transaction sent by source server", TRUE, &seq_num);
		srv_alive = (0 == gtmsource_pid) ? FALSE : is_proc_alive(gtmsource_pid, 0);
		if (!srv_alive)
			gtm_putmsg(VARLSTCNT(4) MAKE_MSG_WARNING(ERR_SRCSRVNOTEXIST), 2,
						LEN_AND_STR(gtmsourcelocal_ptr->secondary_instname));
		else if (gtmsourcelocal_ptr->mode == GTMSOURCE_MODE_PASSIVE)
			util_out_print("WARNING - Source Server is in passive mode, transactions are not being replicated", TRUE);
		if (NULL != jnlpool.gtmsource_local)
			break;
	}
	return (NORMAL_SHUTDOWN);
}