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-rw-r--r--servers/slapd/back-monitor/rww.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/servers/slapd/back-monitor/rww.c b/servers/slapd/back-monitor/rww.c
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+++ b/servers/slapd/back-monitor/rww.c
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+/* readw.c - deal with read waiters subsystem */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2001-2022 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 );
+ 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 );
+ 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 );
+ 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;
+}
+