pcache.c

/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2003-2004 The OpenLDAP Foundation.
 * Portions Copyright 2003 IBM Corporation.
 * Portions Copyright 2003 Symas Corporation.
 * 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 the 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 Apurva Kumar for inclusion
 * in OpenLDAP Software and subsequently rewritten by Howard Chu.
 */

#include "portable.h"

#ifdef SLAPD_OVER_PROXYCACHE

#include <stdio.h>

#include <ac/string.h>
#include <ac/time.h>

#include "slap.h"
#include "ldap_pvt.h"
#include "lutil.h"
#include "ldap_rq.h"

/* query cache structs */
/* query */

typedef struct Query_s {
	Filter* 	filter; 	/* Search Filter */
	AttributeName* 	attrs;		/* Projected attributes */
	struct berval 	base; 		/* Search Base */
	int 		scope;		/* Search scope */
} Query;

/* struct representing a cached query */
typedef struct cached_query_s {
	Query 				query;		/* LDAP query */
	struct berval			q_uuid;		/* query identifier */
	int 				template_id;	/* template of the query */
	time_t 				expiry_time;	/* time till the query is considered valid */
	struct cached_query_s  		*next;  	/* next query in the template */
	struct cached_query_s  		*prev;  	/* previous query in the template */
	struct cached_query_s           *lru_up;	/* previous query in the LRU list */
	struct cached_query_s           *lru_down;	/* next query in the LRU list */
} CachedQuery;

/* struct representing a query template
 * e.g. template string = &(cn=)(mail=)
 */
typedef struct query_template_s {
	struct berval	querystr;	/* Filter string corresponding to the QT */
	int 		attr_set_index; /* determines the projected attributes */

	CachedQuery* 	query;	        /* most recent query cached for the template */
	CachedQuery* 	query_last;     /* oldest query cached for the template */

	int 		no_of_queries;  /* Total number of queries in the template */
	long 		ttl;		/* TTL for the queries of this template */
        ldap_pvt_thread_rdwr_t t_rwlock; /* Rd/wr lock for accessing queries in the template */
} QueryTemplate;

/*
 * Represents a set of projected attributes and any
 * supersets among all specified sets of attributes.
 */

struct attr_set {
	AttributeName*	attrs; 		/* specifies the set */
	int 		count;		/* number of attributes */
	int*		ID_array;	/* array of indices of supersets of 'attrs' */
};

struct query_manager_s;

/* prototypes for functions for 1) query containment
 * 2) query addition, 3) cache replacement
 */
typedef int 	(QCfunc)(struct query_manager_s*, Query*, int );
typedef void  	(AddQueryfunc)(struct query_manager_s*, Query*, int, struct berval*);
typedef void	(CRfunc)(struct query_manager_s*, struct berval * );

/* LDAP query cache */
typedef struct query_manager_s {
	struct attr_set* 	attr_sets;		/* possible sets of projected attributes */
	QueryTemplate*	  	templates;		/* cacheable templates */

	CachedQuery*		lru_top;		/* top and bottom of LRU list */
	CachedQuery*		lru_bottom;

	ldap_pvt_thread_mutex_t		lru_mutex;	/* mutex for accessing LRU list */

	/* Query cache methods */
	QCfunc			*qcfunc;			/* Query containment*/
	CRfunc 			*crfunc;			/* cache replacement */
	AddQueryfunc	*addfunc;			/* add query */
} query_manager;

/* LDAP query cache manager */
typedef struct cache_manager_s {
	BackendDB	db;	/* underlying database */
	unsigned long	num_cached_queries; 		/* total number of cached queries */
	unsigned long   max_queries;			/* upper bound on # of cached queries */
	int 	numattrsets;			/* number of attribute sets */
	int 	numtemplates;			/* number of cacheable templates */
	int 	cur_entries;			/* current number of entries cached */
	int 	max_entries;			/* max number of entries cached */
        int     num_entries_limit;		/* max # of entries in a cacheable query */

	int     cc_period;		/* interval between successive consistency checks (sec) */
	int	cc_paused;
	void	*cc_arg;

	ldap_pvt_thread_mutex_t		cache_mutex;
	ldap_pvt_thread_mutex_t		remove_mutex;

	query_manager*   qm;	/* query cache managed by the cache manager */
} cache_manager;

static AttributeDescription *ad_queryid;
static char *queryid_schema = "( 1.3.6.1.4.1.4203.666.1.12 NAME 'queryid' "
			"DESC 'list of queries the entry belongs to' "
			"EQUALITY octetStringMatch "
			"SYNTAX 1.3.6.1.4.1.1466.115.121.1.40{64} "
			"NO-USER-MODIFICATION USAGE directoryOperation )";

/* Return 1 for an added entry, else 0 */
static int
merge_entry(
	Operation		*op,
	Entry			*e,
	struct berval*		query_uuid )
{
	int		rc;
	Modifications* modlist = NULL;
	const char* 	text = NULL;
	Attribute		*attr;
	char			textbuf[SLAP_TEXT_BUFLEN];
	size_t			textlen = sizeof(textbuf);

	SlapReply sreply = {REP_RESULT};

	slap_callback cb = { NULL, slap_null_cb, NULL, NULL };

	attr = e->e_attrs;
	e->e_attrs = NULL;

	/* add queryid attribute */
	attr_merge_one( e, ad_queryid, query_uuid, NULL );

	/* append the attribute list from the fetched entry */
	e->e_attrs->a_next = attr;

	op->o_tag = LDAP_REQ_ADD;
	op->o_protocol = LDAP_VERSION3;
	op->o_callback = &cb;
	op->o_time = slap_get_time();
	op->o_do_not_cache = 1;

	op->ora_e = e;
	op->o_req_dn = e->e_name;
	op->o_req_ndn = e->e_nname;
	rc = op->o_bd->be_add( op, &sreply );

	if ( rc != LDAP_SUCCESS ) {
		if ( rc == LDAP_ALREADY_EXISTS ) {
			slap_entry2mods( e, &modlist, &text, textbuf, textlen );
			modlist->sml_op = LDAP_MOD_ADD;
			op->o_tag = LDAP_REQ_MODIFY;
			op->orm_modlist = modlist;
			op->o_bd->be_modify( op, &sreply );
			slap_mods_free( modlist );
		} else if ( rc == LDAP_REFERRAL ||
					rc == LDAP_NO_SUCH_OBJECT ) {
			syncrepl_add_glue( op, e );
			e = NULL;
			rc = 1;
		}
		if ( e ) {
			entry_free( e );
			rc = 0;
		}
	} else {
		be_entry_release_w( op, e );
		rc = 1;
	}

	return rc;
}

/* compare base and scope of incoming and cached queries */
static int base_scope_compare(
	struct berval* ndn_stored,
	struct berval* ndn_incoming,
	int scope_stored,
	int scope_incoming	)
{
	struct berval pdn_incoming = BER_BVNULL;

	if (scope_stored < scope_incoming)
		return 0;

	if ( !dnIsSuffix(ndn_incoming, ndn_stored))
		return 0;

	switch(scope_stored) {
	case LDAP_SCOPE_BASE:
		return (ndn_incoming->bv_len == ndn_stored->bv_len);

	case LDAP_SCOPE_ONELEVEL:
		switch(scope_incoming){
		case LDAP_SCOPE_BASE:
			dnParent(ndn_incoming, &pdn_incoming);
			return (pdn_incoming.bv_len == ndn_stored->bv_len);

		case LDAP_SCOPE_ONELEVEL:
			return (ndn_incoming->bv_len == ndn_stored->bv_len);

		default:
			return 0;
		}
	case LDAP_SCOPE_SUBTREE:
		return 1;
		break;
	default:
		return 0;
		break;
    }
}

/* add query on top of LRU list */
static void
add_query_on_top (query_manager* qm, CachedQuery* qc)
{
	CachedQuery* top = qm->lru_top;
	Query* q = (Query*)qc;

	qm->lru_top = qc;

	if (top)
		top->lru_up = qc;
	else
		qm->lru_bottom = qc;

	qc->lru_down = top;
	qc->lru_up = NULL;
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Base of added query = %s\n",
			q->base.bv_val, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Base of added query = %s\n",
			q->base.bv_val, 0, 0 );
#endif
}

/* remove_query from LRU list */

static void
remove_query (query_manager* qm, CachedQuery* qc)
{
	CachedQuery* up;
	CachedQuery* down;

	if (!qc)
		return;

	up = qc->lru_up;
	down = qc->lru_down;

	if (!up)
		qm->lru_top = down;

	if (!down)
		qm->lru_bottom = up;

	if (down)
		down->lru_up = up;

	if (up)
		up->lru_down = down;

	qc->lru_up = qc->lru_down = NULL;
}

static void
invert_string( struct berval *bv )
{
	int i;
	char c;

	for (i=0; i<bv->bv_len/2; i++) {
		c = bv->bv_val[i];
		bv->bv_val[i] = bv->bv_val[bv->bv_len-i-1];
		bv->bv_val[bv->bv_len-i-1] = c;
	}
}

/* find and remove string2 from string1
 * from start if position = 1,
 * from end if position = 3,
 * from anywhere if position = 2
 */

static int
find_and_remove(struct berval* ber1, struct berval* ber2, int position)
{
	char* temp;
	int len;
	int ret=0;

	char* arg1, *arg2;
	char* string1=ber1->bv_val;
	char* string2=ber2->bv_val;

	if (string2 == NULL)
		return 1;
	if (string1 == NULL)
		return 0;

	if (position == 3) {
		invert_string(ber1);
		invert_string(ber2);
	}

	arg1 = string1;
	arg2 = string2;

	temp = strstr(arg1, arg2);

	len = ber2->bv_len;

	if ( temp && (position == 2 || temp == arg1) ) {
		string1 = temp+len;
		strcpy( arg1, string1 );
		ber1->bv_len -= len;
		ret = 1;
	}
	if ( position == 3 ) {
		invert_string(ber1);
		invert_string(ber2);
	}
	return ret;
}


static struct berval*
merge_init_final(struct berval* init, struct berval* any, struct berval* final)
{
	struct berval* merged, *temp;
	int i, any_count, count;

	for (any_count=0; any && any[any_count].bv_val; any_count++)
		;

	count = any_count;

	if (init->bv_val)
		count++;
	if (final->bv_val)
		count++;

	merged = (struct berval*)(ch_malloc((count+1)*sizeof(struct berval)));
	temp = merged;

	if (init->bv_val) {
		*temp++ = *init;
	}

	for (i=0; i<any_count; i++) {
		*temp++ = *any++;
	}

	if (final->bv_val){
		*temp++ = *final;
	}
	temp->bv_val = NULL;
	temp->bv_len = 0;
	return merged;
}

static int
strings_containment(struct berval* stored, struct berval* incoming)
{
	struct berval* element;
	int k=0;
	int j, rc = 0;

	for ( element=stored; element->bv_val != NULL; element++ ) {
		for (j = k; incoming[j].bv_val != NULL; j++) {
			if (find_and_remove(&(incoming[j]), element, 2)) {
				k = j;
				rc = 1;
				break;
			}
			rc = 0;
		}
		if ( rc ) {
			continue;
		} else {
			return 0;
		}
	}
	return 1;
}

static int
substr_containment_substr(Filter* stored, Filter* incoming)
{
	int i;
	int rc = 0;
	int any_count = 0;

	struct berval init_incoming;
	struct berval final_incoming;
	struct berval *any_incoming = NULL;
	struct berval *remaining_incoming = NULL;

	if ((!(incoming->f_sub_initial.bv_val) && (stored->f_sub_initial.bv_val))
	   || (!(incoming->f_sub_final.bv_val) && (stored->f_sub_final.bv_val)))
		return 0;


	ber_dupbv(&init_incoming, &(incoming->f_sub_initial));
	ber_dupbv(&final_incoming, &(incoming->f_sub_final));

	if (incoming->f_sub_any) {
		for ( any_count=0; incoming->f_sub_any[any_count].bv_val != NULL;
				any_count++ )
			;

		any_incoming = (struct berval*)ch_malloc((any_count+1) *
						sizeof(struct berval));

		for (i=0; i<any_count; i++) {
			ber_dupbv(&(any_incoming[i]), &(incoming->f_sub_any[i]));
		}
		any_incoming[any_count].bv_val = NULL;
		any_incoming[any_count].bv_len = 0;
	}

	if (find_and_remove(&init_incoming,
			&(stored->f_sub_initial), 1) && find_and_remove(&final_incoming,
			&(stored->f_sub_final), 3))
	{
		if (stored->f_sub_any == NULL) {
			rc = 1;
			goto final;
		}
		remaining_incoming = merge_init_final(&init_incoming,
						any_incoming, &final_incoming);
		rc = strings_containment(stored->f_sub_any, remaining_incoming);
	}
final:
	free(init_incoming.bv_val);
	free(final_incoming.bv_val);
	if (any_incoming) ber_bvarray_free( any_incoming );
	free(remaining_incoming);

	return rc;
}

static int
substr_containment_equality(Filter* stored, Filter* incoming)
{
	struct berval incoming_val[2];
	int rc = 0;

	ber_dupbv(incoming_val, &(incoming->f_av_value));
	incoming_val[1].bv_val = NULL;
	incoming_val[1].bv_len = 0;

	if (find_and_remove(incoming_val,
			&(stored->f_sub_initial), 1) && find_and_remove(incoming_val,
			&(stored->f_sub_final), 3)) {
		if (stored->f_sub_any == NULL){
			rc = 1;
			goto final;
		}
		rc = strings_containment(stored->f_sub_any, incoming_val);
	}
final:
	free(incoming_val[0].bv_val);
	return rc;
}

/* check whether query is contained in any of
 * the cached queries in template template_index
 */
static int
query_containment(query_manager *qm,
		  Query *query,
		  int template_index)
{
	QueryTemplate* templa= qm->templates;
	CachedQuery* qc;
	Query* q;
	Filter* inputf = query->filter;
	struct berval* base = &(query->base);
	int scope = query->scope;
	int res=0;
	Filter* fs;
	Filter* fi;
	int ret, rc;
	const char* text;

	MatchingRule* mrule = NULL;
	if (inputf != NULL) {
#ifdef NEW_LOGGING
		LDAP_LOG( BACK_META, DETAIL1, "Lock QC index = %d\n",
				template_index, 0, 0 );
#else
		Debug( LDAP_DEBUG_ANY, "Lock QC index = %d\n",
				template_index, 0, 0 );
#endif
		ldap_pvt_thread_rdwr_rlock(&(templa[template_index].t_rwlock));
		for(qc=templa[template_index].query; qc != NULL; qc= qc->next) {
			q = (Query*)qc;
			if(base_scope_compare(&(q->base), base, q->scope, scope)) {
				fi = inputf;
				fs = q->filter;
				do {
					res=0;
					switch (fs->f_choice) {
					case LDAP_FILTER_EQUALITY:
						if (fi->f_choice == LDAP_FILTER_EQUALITY)
							mrule = fs->f_ava->aa_desc->ad_type->sat_equality;
						else
							ret = 1;
						break;
					case LDAP_FILTER_GE:
					case LDAP_FILTER_LE:
						mrule = fs->f_ava->aa_desc->ad_type->sat_ordering;
						break;
					default:
						mrule = NULL; 
					}
					if (mrule) {
						rc = value_match(&ret, fs->f_ava->aa_desc, mrule,
						 	SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
							&(fi->f_ava->aa_value),
							&(fs->f_ava->aa_value), &text);
						if (rc != LDAP_SUCCESS) {
							ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
#ifdef NEW_LOGGING
							LDAP_LOG( BACK_META, DETAIL1,
							"Unlock: Exiting QC index=%d\n",
							template_index, 0, 0 );
#else
							Debug( LDAP_DEBUG_ANY,
							"Unlock: Exiting QC index=%d\n",
							template_index, 0, 0 );
#endif
							return 0;
						}
					}
					switch (fs->f_choice) {
					case LDAP_FILTER_OR:
					case LDAP_FILTER_AND:
						fs = fs->f_and;
						fi = fi->f_and;
						res=1;
						break;
					case LDAP_FILTER_SUBSTRINGS:
						/* check if the equality query can be
						* answered with cached substring query */
						if ((fi->f_choice == LDAP_FILTER_EQUALITY)
							&& substr_containment_equality(
							fs, fi))
							res=1;
						/* check if the substring query can be
						* answered with cached substring query */
						if ((fi->f_choice ==LDAP_FILTER_SUBSTRINGS
							) && substr_containment_substr(
							fs, fi))
							res= 1;
						fs=fs->f_next;
						fi=fi->f_next;
						break;
					case LDAP_FILTER_PRESENT:
						res=1;
						fs=fs->f_next;
						fi=fi->f_next;
						break;
					case LDAP_FILTER_EQUALITY:
						if (ret == 0)
							res = 1;
						fs=fs->f_next;
						fi=fi->f_next;
						break;
					case LDAP_FILTER_GE:
						if (ret >= 0)
							res = 1;
						fs=fs->f_next;
						fi=fi->f_next;
						break;
					case LDAP_FILTER_LE:
						if (ret <= 0)
							res = 1;
						fs=fs->f_next;
						fi=fi->f_next;
						break;
					case LDAP_FILTER_NOT:
						res=0;
						break;
					default:
						break;
					}
				} while((res) && (fi != NULL) && (fs != NULL));

				if(res) {
					ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
					if (qm->lru_top != qc) {
						remove_query(qm, qc);
						add_query_on_top(qm, qc);
					}
					ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
					return 1;
				}
			}
		}
#ifdef NEW_LOGGING
		LDAP_LOG( BACK_META, DETAIL1,
			"Not answerable: Unlock QC index=%d\n",
			template_index, 0, 0 );
#else
		Debug( LDAP_DEBUG_ANY,
			"Not answerable: Unlock QC index=%d\n",
			template_index, 0, 0 );
#endif
		ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
	}
	return 0;
}

static void
free_query (CachedQuery* qc)
{
	Query* q = (Query*)qc;
	int i;

	free(qc->q_uuid.bv_val);
	filter_free(q->filter);
	free (q->base.bv_val);
	for (i=0; q->attrs[i].an_name.bv_val; i++) {
		free(q->attrs[i].an_name.bv_val);
	}
	free(q->attrs);
	free(qc);
}


/* Add query to query cache */
static void add_query(
	query_manager* qm,
	Query* query,
	int template_index,
	struct berval* uuid)
{
	CachedQuery* new_cached_query = (CachedQuery*) ch_malloc(sizeof(CachedQuery));
	QueryTemplate* templ = (qm->templates)+template_index;
	Query* new_query;
	new_cached_query->template_id = template_index;
	new_cached_query->q_uuid = *uuid;
	new_cached_query->lru_up = NULL;
	new_cached_query->lru_down = NULL;
	new_cached_query->expiry_time = slap_get_time() + templ->ttl;
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Added query expires at %ld\n",
			(long) new_cached_query->expiry_time, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Added query expires at %ld\n",
			(long) new_cached_query->expiry_time, 0, 0 );
#endif
	new_query = (Query*)new_cached_query;

	ber_dupbv(&new_query->base, &query->base);
	new_query->scope = query->scope;
	new_query->filter = query->filter;
	new_query->attrs = query->attrs;

	/* Adding a query    */
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Lock AQ index = %d\n",
			template_index, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Lock AQ index = %d\n",
			template_index, 0, 0 );
#endif
	ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
	if (templ->query == NULL)
		templ->query_last = new_cached_query;
	else
		templ->query->prev = new_cached_query;
	new_cached_query->next = templ->query;
	new_cached_query->prev = NULL;
	templ->query = new_cached_query;
	templ->no_of_queries++;
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "TEMPLATE %d QUERIES++ %d\n",
			template_index, templ->no_of_queries, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES++ %d\n",
			template_index, templ->no_of_queries, 0 );
#endif

#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Unlock AQ index = %d \n",
			template_index, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Unlock AQ index = %d \n",
			template_index, 0, 0 );
#endif
	ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);

	/* Adding on top of LRU list  */
	ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
	add_query_on_top(qm, new_cached_query);
	ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
}

static void
remove_from_template (CachedQuery* qc, QueryTemplate* template)
{
	if (!qc->prev && !qc->next) {
		template->query_last = template->query = NULL;
	} else if (qc->prev == NULL) {
		qc->next->prev = NULL;
		template->query = qc->next;
	} else if (qc->next == NULL) {
		qc->prev->next = NULL;
		template->query_last = qc->prev;
	} else {
		qc->next->prev = qc->prev;
		qc->prev->next = qc->next;
	}

	template->no_of_queries--;
}

/* remove bottom query of LRU list from the query cache */
static void cache_replacement(query_manager* qm, struct berval *result)
{
	CachedQuery* bottom;
	int temp_id;

	ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
	bottom = qm->lru_bottom;

	result->bv_val = NULL;
	result->bv_len = 0;

	if (!bottom) {
#ifdef NEW_LOGGING
		LDAP_LOG ( BACK_META, DETAIL1,
			"Cache replacement invoked without "
			"any query in LRU list\n", 0, 0, 0 );
#else
		Debug ( LDAP_DEBUG_ANY,
			"Cache replacement invoked without "
			"any query in LRU list\n", 0, 0, 0 );
#endif
		return;
	}

	temp_id = bottom->template_id;
	remove_query(qm, bottom);
	ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);

	*result = bottom->q_uuid;
	bottom->q_uuid.bv_val = NULL;

#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Lock CR index = %d\n", temp_id, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Lock CR index = %d\n", temp_id, 0, 0 );
#endif
	ldap_pvt_thread_rdwr_wlock(&(qm->templates[temp_id].t_rwlock));
	remove_from_template(bottom, (qm->templates+temp_id));
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "TEMPLATE %d QUERIES-- %d\n",
		temp_id, qm->templates[temp_id].no_of_queries, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES-- %d\n",
		temp_id, qm->templates[temp_id].no_of_queries, 0 );
#endif
#ifdef NEW_LOGGING
	LDAP_LOG( BACK_META, DETAIL1, "Unlock CR index = %d\n", temp_id, 0, 0 );
#else
	Debug( LDAP_DEBUG_ANY, "Unlock CR index = %d\n", temp_id, 0, 0 );
#endif
	ldap_pvt_thread_rdwr_wunlock(&(qm->templates[temp_id].t_rwlock));
	free_query(bottom);
}

struct query_info {
	struct query_info *next;
	struct berval xdn;
	int del;
};

static int
remove_func (
	Operation	*op,
	SlapReply	*rs
)
{
	Attribute *attr;
	struct query_info *qi;
	int count = 0;

	if ( rs->sr_type != REP_SEARCH ) return 0;

	for (attr = rs->sr_entry->e_attrs; attr!= NULL; attr = attr->a_next) {
		if (attr->a_desc == ad_queryid) {
			for (count=0; attr->a_vals[count].bv_val; count++)
				;
			break;
		}
	}
	if ( count == 0 ) return 0;
	qi = op->o_tmpalloc( sizeof( struct query_info ), op->o_tmpmemctx );
	qi->next = op->o_callback->sc_private;
	op->o_callback->sc_private = qi;
	ber_dupbv_x( &qi->xdn, &rs->sr_entry->e_nname, op->o_tmpmemctx );
	qi->del = ( count == 1 );

	return 0;
}

static int
remove_query_data (
	Operation	*op,
	SlapReply	*rs,
	struct berval* query_uuid)
{
	struct query_info	*qi, *qnext;
	char			filter_str[64];
	AttributeAssertion	ava;
	Filter			filter = {LDAP_FILTER_EQUALITY};
	SlapReply 		sreply = {REP_RESULT};
	slap_callback cb = { NULL, remove_func, NULL, NULL };
	int deleted = 0;

	sreply.sr_entry = NULL;
	sreply.sr_nentries = 0;
	op->ors_filterstr.bv_len = snprintf(filter_str, sizeof(filter_str),
		"(%s=%s)", ad_queryid->ad_cname.bv_val, query_uuid->bv_val);
	filter.f_ava = &ava;
	filter.f_av_desc = ad_queryid;
	filter.f_av_value = *query_uuid;

	op->o_tag = LDAP_REQ_SEARCH;
	op->o_protocol = LDAP_VERSION3;
	op->o_callback = &cb;
	op->o_time = slap_get_time();
	op->o_do_not_cache = 1;

	op->o_req_dn = op->o_bd->be_suffix[0];
	op->o_req_ndn = op->o_bd->be_nsuffix[0];
	op->ors_scope = LDAP_SCOPE_SUBTREE;
	op->ors_deref = LDAP_DEREF_NEVER;
	op->ors_slimit = SLAP_NO_LIMIT;
	op->ors_tlimit = SLAP_NO_LIMIT;
	op->ors_filter = &filter;
	op->ors_filterstr.bv_val = filter_str;
	op->ors_filterstr.bv_len = strlen(filter_str);
	op->ors_attrs = NULL;
	op->ors_attrsonly = 0;

	op->o_bd->be_search( op, &sreply );

	for ( qi=cb.sc_private; qi; qi=qnext ) {
		qnext = qi->next;

		op->o_req_dn = qi->xdn;
		op->o_req_ndn = qi->xdn;

		if ( qi->del) {
#ifdef NEW_LOGGING
			LDAP_LOG( BACK_META, DETAIL1,
				"DELETING ENTRY TEMPLATE=%s\n",
				query_uuid->bv_val, 0, 0 );
#else
			Debug( LDAP_DEBUG_ANY, "DELETING ENTRY TEMPLATE=%s\n",
				query_uuid->bv_val, 0, 0 );
#endif

			op->o_tag = LDAP_REQ_DELETE;

			if (op->o_bd->be_delete(op, &sreply) == LDAP_SUCCESS) {
				deleted++;
			}
		} else {
			Modifications mod;
			struct berval vals[2];

			vals[0] = *query_uuid;
			vals[1].bv_val = NULL;
			vals[1].bv_len = 0;
			mod.sml_op = LDAP_MOD_DELETE;
			mod.sml_desc = ad_queryid;
			mod.sml_type = ad_queryid->ad_cname;
			mod.sml_values = vals;
			mod.sml_nvalues = NULL;
			mod.sml_next = NULL;
#ifdef NEW_LOGGING
			LDAP_LOG( BACK_META, DETAIL1,
				"REMOVING TEMP ATTR : TEMPLATE=%s\n",
				query_uuid->bv_val, 0, 0 );
#else
			Debug( LDAP_DEBUG_ANY,
				"REMOVING TEMP ATTR : TEMPLATE=%s\n",
				query_uuid->bv_val, 0, 0 );
#endif

			op->orm_modlist = &mod;

			op->o_bd->be_modify( op, &sreply );
		}
		op->o_tmpfree( qi->xdn.bv_val, op->o_tmpmemctx );
		op->o_tmpfree( qi, op->o_tmpmemctx );
	}
	return deleted;
}

static int
get_attr_set(
	AttributeName* attrs,
	query_manager* qm,
	int num
);

static int
attrscmp(
	AttributeName* attrs_in,
	AttributeName* attrs
);

static int
is_temp_answerable(
	int attr_set,
	struct berval* tempstr,
	query_manager* qm,
	int template_id )
{
	QueryTemplate *qt = qm->templates + template_id;

	if (attr_set != qt->attr_set_index) {
		int* id_array = qm->attr_sets[attr_set].ID_array;

		while (*id_array != -1) {
			if (*id_array == qt->attr_set_index)
				break;
			id_array++;
		}
		if (*id_array == -1)
			return 0;
	}
	return (qt->querystr.bv_len == tempstr->bv_len &&
		strcasecmp(qt->querystr.bv_val, tempstr->bv_val) == 0);
}

static int
filter2template(
	Filter			*f,
	struct			berval *fstr,
	AttributeName**		filter_attrs,
	int*			filter_cnt )
{
	AttributeDescription *ad;

	switch ( f->f_choice ) {
	case LDAP_FILTER_EQUALITY:
		ad = f->f_av_desc;
		sprintf( fstr->bv_val+fstr->bv_len, "(%s=)", ad->ad_cname.bv_val );
		fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=)") - 1 );
		break;

	case LDAP_FILTER_GE:
		ad = f->f_av_desc;
		sprintf( fstr->bv_val+fstr->bv_len, "(%s>=)", ad->ad_cname.bv_val);
		fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(>=)") - 1 );
		break;

	case LDAP_FILTER_LE:
		ad = f->f_av_desc;
		sprintf( fstr->bv_val+fstr->bv_len, "(%s<=)", ad->ad_cname.bv_val);
		fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(<=)") - 1 );
		break;