git.sur5r.net Git - openldap/blob - servers/slapd/back-monitor/rww.c

   1 /* readw.c - deal with read waiters subsystem */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2001-2005 The OpenLDAP Foundation.
   6  * Portions Copyright 2001-2003 Pierangelo Masarati.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by Pierangelo Masarati for inclusion
  19  * in OpenLDAP Software.
  20  */
  21
  22 #include "portable.h"
  23
  24 #include <stdio.h>
  25 #include <ac/string.h>
  26
  27 #include "slap.h"
  28 #include "lutil.h"
  29 #include "back-monitor.h"
  30
  31 enum {
  32         MONITOR_RWW_READ = 0,
  33         MONITOR_RWW_WRITE,
  34
  35         MONITOR_RWW_LAST
  36 };
  37
  38 struct monitor_rww_t {
  39         struct berval   rdn;
  40         struct berval   nrdn;
  41 } monitor_rww[] = {
  42         { BER_BVC("cn=Read"),           BER_BVNULL },
  43         { BER_BVC("cn=Write"),          BER_BVNULL },
  44         { BER_BVNULL,                   BER_BVNULL }
  45 };
  46
  47 int
  48 monitor_subsys_rww_init(
  49         BackendDB               *be,
  50         monitor_subsys_t        *ms
  51 )
  52 {
  53         monitor_info_t  *mi;
  54
  55         Entry           **ep, *e_conn;
  56         monitor_entry_t *mp;
  57         int                     i;
  58
  59         assert( be != NULL );
  60
  61         mi = ( monitor_info_t * )be->be_private;
  62
  63         if ( monitor_cache_get( mi, &ms->mss_ndn, &e_conn ) ) {
  64                 Debug( LDAP_DEBUG_ANY,
  65                         "monitor_subsys_rww_init: "
  66                         "unable to get entry \"%s\"\n",
  67                         ms->mss_ndn.bv_val, 0, 0 );
  68                 return( -1 );
  69         }
  70
  71         mp = ( monitor_entry_t * )e_conn->e_private;
  72         mp->mp_children = NULL;
  73         ep = &mp->mp_children;
  74
  75         for ( i = 0; i < MONITOR_RWW_LAST; i++ ) {
  76                 char                    buf[ BACKMONITOR_BUFSIZE ];
  77                 struct berval           nrdn, bv;
  78                 Entry                   *e;
  79
  80                 snprintf( buf, sizeof( buf ),
  81                         "dn: %s,%s\n"
  82                         "objectClass: %s\n"
  83                         "structuralObjectClass: %s\n"
  84                         "cn: %s\n"
  85                         "creatorsName: %s\n"
  86                         "modifiersName: %s\n"
  87                         "createTimestamp: %s\n"
  88                         "modifyTimestamp: %s\n",
  89                         monitor_rww[ i ].rdn.bv_val,
  90                         ms->mss_dn.bv_val,
  91                         mi->mi_oc_monitorCounterObject->soc_cname.bv_val,
  92                         mi->mi_oc_monitorCounterObject->soc_cname.bv_val,
  93                         &monitor_rww[ i ].rdn.bv_val[ STRLENOF( "cn=" ) ],
  94                         mi->mi_creatorsName.bv_val,
  95                         mi->mi_creatorsName.bv_val,
  96                         mi->mi_startTime.bv_val,
  97                         mi->mi_startTime.bv_val );
  98
  99                 e = str2entry( buf );
 100                 if ( e == NULL ) {
 101                         Debug( LDAP_DEBUG_ANY,
 102                                 "monitor_subsys_rww_init: "
 103                                 "unable to create entry \"cn=Read,%s\"\n",
 104                                 ms->mss_ndn.bv_val, 0, 0 );
 105                         return( -1 );
 106                 }
 107
 108                 /* steal normalized RDN */
 109                 dnRdn( &e->e_nname, &nrdn );
 110                 ber_dupbv( &monitor_rww[ i ].nrdn, &nrdn );
 111
 112                 BER_BVSTR( &bv, "0" );
 113                 attr_merge_one( e, mi->mi_ad_monitorCounter, &bv, &bv );
 114
 115                 mp = monitor_entrypriv_create();
 116                 if ( mp == NULL ) {
 117                         return -1;
 118                 }
 119                 e->e_private = ( void * )mp;
 120                 mp->mp_info = ms;
 121                 mp->mp_flags = ms->mss_flags \
 122                         | MONITOR_F_SUB | MONITOR_F_PERSISTENT;
 123
 124                 if ( monitor_cache_add( mi, e ) ) {
 125                         Debug( LDAP_DEBUG_ANY,
 126                                 "monitor_subsys_rww_init: "
 127                                 "unable to add entry \"%s,%s\"\n",
 128                                 monitor_rww[ i ].rdn.bv_val,
 129                                 ms->mss_ndn.bv_val, 0 );
 130                         return( -1 );
 131                 }
 132
 133                 *ep = e;
 134                 ep = &mp->mp_next;
 135         }
 136
 137         monitor_cache_release( mi, e_conn );
 138
 139         return( 0 );
 140 }
 141
 142 int
 143 monitor_subsys_rww_update(
 144         Operation               *op,
 145         SlapReply               *rs,
 146         Entry                   *e
 147 )
 148 {
 149         monitor_info_t *mi = (monitor_info_t *)op->o_bd->be_private;
 150         Connection      *c;
 151         int             connindex;
 152         long            nconns, nwritewaiters, nreadwaiters;
 153
 154         int             i;
 155         struct berval   nrdn;
 156
 157         Attribute       *a;
 158         char            buf[] = "+9223372036854775807L";
 159         long            num = 0;
 160         ber_len_t       len;
 161
 162         assert( mi != NULL );
 163         assert( e != NULL );
 164
 165         dnRdn( &e->e_nname, &nrdn );
 166
 167         for ( i = 0; !BER_BVISNULL( &monitor_rww[ i ].nrdn ); i++ ) {
 168                 if ( dn_match( &nrdn, &monitor_rww[ i ].nrdn ) ) {
 169                         break;
 170                 }
 171         }
 172
 173         if ( i == MONITOR_RWW_LAST ) {
 174                 return SLAP_CB_CONTINUE;
 175         }
 176
 177         nconns = nwritewaiters = nreadwaiters = 0;
 178         for ( c = connection_first( &connindex );
 179                         c != NULL;
 180                         c = connection_next( c, &connindex ), nconns++ )
 181         {
 182                 if ( c->c_writewaiter ) {
 183                         nwritewaiters++;
 184                 }
 185
 186                 /* FIXME: ?!? */
 187                 if ( c->c_currentber != NULL ) {
 188                         nreadwaiters++;
 189                 }
 190         }
 191         connection_done(c);
 192
 193         switch ( i ) {
 194         case MONITOR_RWW_READ:
 195                 num = nreadwaiters;
 196                 break;
 197
 198         case MONITOR_RWW_WRITE:
 199                 num = nwritewaiters;
 200                 break;
 201
 202         default:
 203                 assert( 0 );
 204         }
 205
 206         snprintf( buf, sizeof( buf ), "%ld", num );
 207
 208         a = attr_find( e->e_attrs, mi->mi_ad_monitorCounter );
 209         assert( a );
 210         len = strlen( buf );
 211         if ( len > a->a_vals[ 0 ].bv_len ) {
 212                 a->a_vals[ 0 ].bv_val = ber_memrealloc( a->a_vals[ 0 ].bv_val, len + 1 );
 213                 if ( BER_BVISNULL( &a->a_vals[ 0 ] ) ) {
 214                         BER_BVZERO( &a->a_vals[ 0 ] );
 215                         return SLAP_CB_CONTINUE;
 216                 }
 217         }
 218         AC_MEMCPY( a->a_vals[ 0 ].bv_val, buf, len + 1 );
 219         a->a_vals[ 0 ].bv_len = len;
 220
 221         /* FIXME: touch modifyTimestamp? */
 222
 223         return SLAP_CB_CONTINUE;
 224 }
 225