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/* readw.c - deal with read waiters subsystem */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2001-2021 The OpenLDAP Foundation.
* Portions Copyright 2001-2003 Pierangelo Masarati.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
* This work was initially developed by Pierangelo Masarati for inclusion
* in OpenLDAP Software.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include "slap.h"
#include "lutil.h"
#include "back-monitor.h"
static int
monitor_subsys_rww_destroy(
BackendDB *be,
monitor_subsys_t *ms );
static int
monitor_subsys_rww_update(
Operation *op,
SlapReply *rs,
Entry *e );
enum {
MONITOR_RWW_READ = 0,
MONITOR_RWW_WRITE,
MONITOR_RWW_LAST
};
static struct monitor_rww_t {
struct berval rdn;
struct berval nrdn;
} monitor_rww[] = {
{ BER_BVC("cn=Read"), BER_BVNULL },
{ BER_BVC("cn=Write"), BER_BVNULL },
{ BER_BVNULL, BER_BVNULL }
};
int
monitor_subsys_rww_init(
BackendDB *be,
monitor_subsys_t *ms )
{
monitor_info_t *mi;
Entry **ep, *e_conn;
monitor_entry_t *mp;
int i;
assert( be != NULL );
ms->mss_destroy = monitor_subsys_rww_destroy;
ms->mss_update = monitor_subsys_rww_update;
mi = ( monitor_info_t * )be->be_private;
if ( monitor_cache_get( mi, &ms->mss_ndn, &e_conn ) ) {
Debug( LDAP_DEBUG_ANY,
"monitor_subsys_rww_init: "
"unable to get entry \"%s\"\n",
ms->mss_ndn.bv_val, 0, 0 );
return( -1 );
}
mp = ( monitor_entry_t * )e_conn->e_private;
mp->mp_children = NULL;
ep = &mp->mp_children;
for ( i = 0; i < MONITOR_RWW_LAST; i++ ) {
struct berval nrdn, bv;
Entry *e;
e = monitor_entry_stub( &ms->mss_dn, &ms->mss_ndn, &monitor_rww[i].rdn,
mi->mi_oc_monitorCounterObject, NULL, NULL );
if ( e == NULL ) {
Debug( LDAP_DEBUG_ANY,
"monitor_subsys_rww_init: "
"unable to create entry \"cn=Read,%s\"\n",
ms->mss_ndn.bv_val, 0, 0 );
return( -1 );
}
/* steal normalized RDN */
dnRdn( &e->e_nname, &nrdn );
ber_dupbv( &monitor_rww[ i ].nrdn, &nrdn );
BER_BVSTR( &bv, "0" );
attr_merge_one( e, mi->mi_ad_monitorCounter, &bv, NULL );
mp = monitor_entrypriv_create();
if ( mp == NULL ) {
return -1;
}
e->e_private = ( void * )mp;
mp->mp_info = ms;
mp->mp_flags = ms->mss_flags \
| MONITOR_F_SUB | MONITOR_F_PERSISTENT;
if ( monitor_cache_add( mi, e ) ) {
Debug( LDAP_DEBUG_ANY,
"monitor_subsys_rww_init: "
"unable to add entry \"%s,%s\"\n",
monitor_rww[ i ].rdn.bv_val,
ms->mss_ndn.bv_val, 0 );
return( -1 );
}
*ep = e;
ep = &mp->mp_next;
}
monitor_cache_release( mi, e_conn );
return( 0 );
}
static int
monitor_subsys_rww_destroy(
BackendDB *be,
monitor_subsys_t *ms )
{
int i;
for ( i = 0; i < MONITOR_RWW_LAST; i++ ) {
ber_memfree_x( monitor_rww[ i ].nrdn.bv_val, NULL );
}
return 0;
}
static int
monitor_subsys_rww_update(
Operation *op,
SlapReply *rs,
Entry *e )
{
monitor_info_t *mi = (monitor_info_t *)op->o_bd->be_private;
Connection *c;
ber_socket_t connindex;
long nconns, nwritewaiters, nreadwaiters;
int i;
struct berval nrdn;
Attribute *a;
char buf[LDAP_PVT_INTTYPE_CHARS(long)];
long num = 0;
ber_len_t len;
assert( mi != NULL );
assert( e != NULL );
dnRdn( &e->e_nname, &nrdn );
for ( i = 0; !BER_BVISNULL( &monitor_rww[ i ].nrdn ); i++ ) {
if ( dn_match( &nrdn, &monitor_rww[ i ].nrdn ) ) {
break;
}
}
if ( i == MONITOR_RWW_LAST ) {
return SLAP_CB_CONTINUE;
}
nconns = nwritewaiters = nreadwaiters = 0;
for ( c = connection_first( &connindex );
c != NULL;
c = connection_next( c, &connindex ), nconns++ )
{
if ( c->c_writewaiter ) {
nwritewaiters++;
}
/* FIXME: ?!? */
if ( c->c_currentber != NULL ) {
nreadwaiters++;
}
}
connection_done(c);
switch ( i ) {
case MONITOR_RWW_READ:
num = nreadwaiters;
break;
case MONITOR_RWW_WRITE:
num = nwritewaiters;
break;
default:
assert( 0 );
}
snprintf( buf, sizeof( buf ), "%ld", num );
a = attr_find( e->e_attrs, mi->mi_ad_monitorCounter );
assert( a != NULL );
len = strlen( buf );
if ( len > a->a_vals[ 0 ].bv_len ) {
a->a_vals[ 0 ].bv_val = ber_memrealloc( a->a_vals[ 0 ].bv_val, len + 1 );
if ( BER_BVISNULL( &a->a_vals[ 0 ] ) ) {
BER_BVZERO( &a->a_vals[ 0 ] );
return SLAP_CB_CONTINUE;
}
}
AC_MEMCPY( a->a_vals[ 0 ].bv_val, buf, len + 1 );
a->a_vals[ 0 ].bv_len = len;
/* FIXME: touch modifyTimestamp? */
return SLAP_CB_CONTINUE;
}
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