/* readw.c - deal with read waiters subsystem */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 2001-2017 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 * . */ /* ACKNOWLEDGEMENTS: * This work was initially developed by Pierangelo Masarati for inclusion * in OpenLDAP Software. */ #include "portable.h" #include #include #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; }