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openldap/servers/slapd/overlays/pcache.c

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/* $OpenLDAP$ */
/* 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 "lutil.h"
#include "ldap_rq.h"
/* query cache structs */
/* query */
typedef struct Query_s {
Filter* filter; /* Search Filter */
AttributeName* attrs; /* Projected attributes */
AttributeName* save_attrs; /* original attributes, saved for response */
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 */
char response_cb; /* install the response callback
* at the tail of the callback list */
#define PCACHE_RESPONSE_CB_HEAD 0
#define PCACHE_RESPONSE_CB_TAIL 1
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;
Debug( LDAP_DEBUG_ANY, "Base of added query = %s\n",
q->base.bv_val, 0, 0 );
}
/* 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) {
Debug( LDAP_DEBUG_ANY, "Lock QC index = %d\n",
template_index, 0, 0 );
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));
Debug( LDAP_DEBUG_ANY,
"Unlock: Exiting QC index=%d\n",
template_index, 0, 0 );
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;
}
}
}
Debug( LDAP_DEBUG_ANY,
"Not answerable: Unlock QC index=%d\n",
template_index, 0, 0 );
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;
Debug( LDAP_DEBUG_ANY, "Added query expires at %ld\n",
(long) new_cached_query->expiry_time, 0, 0 );
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 */
Debug( LDAP_DEBUG_ANY, "Lock AQ index = %d\n",
template_index, 0, 0 );
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++;
Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES++ %d\n",
template_index, templ->no_of_queries, 0 );
Debug( LDAP_DEBUG_ANY, "Unlock AQ index = %d \n",
template_index, 0, 0 );
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) {
Debug ( LDAP_DEBUG_ANY,
"Cache replacement invoked without "
"any query in LRU list\n", 0, 0, 0 );
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;
Debug( LDAP_DEBUG_ANY, "Lock CR index = %d\n", temp_id, 0, 0 );
ldap_pvt_thread_rdwr_wlock(&(qm->templates[temp_id].t_rwlock));
remove_from_template(bottom, (qm->templates+temp_id));
Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES-- %d\n",
temp_id, qm->templates[temp_id].no_of_queries, 0 );
Debug( LDAP_DEBUG_ANY, "Unlock CR index = %d\n", temp_id, 0, 0 );
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) {
Debug( LDAP_DEBUG_ANY, "DELETING ENTRY TEMPLATE=%s\n",
query_uuid->bv_val, 0, 0 );
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;
Debug( LDAP_DEBUG_ANY,
"REMOVING TEMP ATTR : TEMPLATE=%s\n",
query_uuid->bv_val, 0, 0 );
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;
case LDAP_FILTER_APPROX:
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_SUBSTRINGS:
ad = f->f_sub_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_PRESENT:
ad = f->f_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_AND:
case LDAP_FILTER_OR:
case LDAP_FILTER_NOT: {
int rc = 0;
sprintf( fstr->bv_val+fstr->bv_len, "(%c",
f->f_choice == LDAP_FILTER_AND ? '&' :
f->f_choice == LDAP_FILTER_OR ? '|' : '!' );
fstr->bv_len += sizeof("(%") - 1;
for ( f = f->f_list; f != NULL; f = f->f_next ) {
rc = filter2template( f, fstr, filter_attrs, filter_cnt );
if ( rc ) break;
}
sprintf( fstr->bv_val+fstr->bv_len, ")" );
fstr->bv_len += sizeof(")") - 1;
return rc;
}
default:
strcpy( fstr->bv_val, "(?=?)" );
fstr->bv_len += sizeof("(?=?)")-1;
return -1;
}
*filter_attrs = (AttributeName *)ch_realloc(*filter_attrs,
(*filter_cnt + 2)*sizeof(AttributeName));
(*filter_attrs)[*filter_cnt].an_desc = ad;
(*filter_attrs)[*filter_cnt].an_name = ad->ad_cname;
(*filter_attrs)[*filter_cnt+1].an_name.bv_val = NULL;
(*filter_attrs)[*filter_cnt+1].an_name.bv_len = 0;
(*filter_cnt)++;
return 0;
}
struct search_info {
slap_overinst *on;
Query query;
int template_id;
int max;
int over;
int count;
Entry *head, *tail;
};
static int
cache_entries(
Operation *op,
SlapReply *rs,
struct berval *query_uuid)
{
struct search_info *si = op->o_callback->sc_private;
slap_overinst *on = si->on;
cache_manager *cm = on->on_bi.bi_private;
query_manager* qm = cm->qm;
int i;
int return_val = 0;
Entry *e;
struct berval crp_uuid;
char uuidbuf[ LDAP_LUTIL_UUIDSTR_BUFSIZE ];
Operation op_tmp = *op;
query_uuid->bv_len = lutil_uuidstr(uuidbuf, sizeof(uuidbuf));
ber_str2bv(uuidbuf, query_uuid->bv_len, 1, query_uuid);
op_tmp.o_bd = &cm->db;
op_tmp.o_dn = cm->db.be_rootdn;
op_tmp.o_ndn = cm->db.be_rootndn;
Debug( LDAP_DEBUG_ANY, "UUID for query being added = %s\n",
uuidbuf, 0, 0 );
for ( e=si->head; e; e=si->head ) {
si->head = e->e_private;
e->e_private = NULL;
Debug( LDAP_DEBUG_NONE, "LOCKING REMOVE MUTEX\n", 0, 0, 0 );
ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
Debug( LDAP_DEBUG_NONE, "LOCKED REMOVE MUTEX\n", 0, 0, 0);
while ( cm->cur_entries > (cm->max_entries) ) {
qm->crfunc(qm, &crp_uuid);
if (crp_uuid.bv_val) {
Debug( LDAP_DEBUG_ANY,
"Removing query UUID %s\n",
crp_uuid.bv_val, 0, 0 );
return_val = remove_query_data(&op_tmp, rs, &crp_uuid);
Debug( LDAP_DEBUG_ANY,
"QUERY REMOVED, SIZE=%d\n",
return_val, 0, 0);
ldap_pvt_thread_mutex_lock(
&cm->cache_mutex );
cm->cur_entries -= return_val;
cm->num_cached_queries--;
Debug( LDAP_DEBUG_ANY,
"STORED QUERIES = %lu\n",
cm->num_cached_queries, 0, 0 );
ldap_pvt_thread_mutex_unlock(
&cm->cache_mutex );
Debug( LDAP_DEBUG_ANY,
"QUERY REMOVED, CACHE ="
"%d entries\n",
cm->cur_entries, 0, 0 );
}
}
return_val = merge_entry(&op_tmp, e, query_uuid);
ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
cm->cur_entries += return_val;
Debug( LDAP_DEBUG_ANY,
"ENTRY ADDED/MERGED, CACHED ENTRIES=%d\n",
cm->cur_entries, 0, 0 );
return_val = 0;
ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
}
ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
cm->num_cached_queries++;
Debug( LDAP_DEBUG_ANY, "STORED QUERIES = %lu\n",
cm->num_cached_queries, 0, 0 );
ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
return return_val;
}
static int
proxy_cache_response(
Operation *op,
SlapReply *rs )
{
struct search_info *si = op->o_callback->sc_private;
slap_overinst *on = si->on;
cache_manager *cm = on->on_bi.bi_private;
query_manager* qm = cm->qm;
struct berval uuid;
if ( rs->sr_type == REP_SEARCH ) {
Entry *e;
/* If we haven't exceeded the limit for this query,
* build a chain of answers to store. If we hit the
* limit, empty the chain and ignore the rest.
*/
if ( !si->over ) {
if ( si->count < si->max ) {
si->count++;
e = entry_dup( rs->sr_entry );
if ( !si->head ) si->head = e;
if ( si->tail ) si->tail->e_private = e;
si->tail = e;
} else {
si->over = 1;
si->count = 0;
for (;si->head; si->head=e) {
e = si->head->e_private;
si->head->e_private = NULL;
entry_free(si->head);
}
si->tail = NULL;
}
}
if (rs->sr_attrs != op->ors_attrs ) {
op->o_tmpfree( rs->sr_attrs, op->o_tmpmemctx );
}
rs->sr_attrs = si->query.save_attrs;
op->o_tmpfree( op->ors_attrs, op->o_tmpmemctx );
op->ors_attrs = si->query.save_attrs;
si->query.save_attrs = NULL;
} else if ( rs->sr_type == REP_RESULT ) {
if ( si->count && cache_entries( op, rs, &uuid ) == 0 ) {
qm->addfunc(qm, &si->query, si->template_id, &uuid);
/* If the consistency checker suspended itself,
* wake it back up
*/
if ( cm->cc_paused ) {
ldap_pvt_thread_mutex_lock( &syncrepl_rq.rq_mutex );
if ( cm->cc_paused ) {
cm->cc_paused = 0;
ldap_pvt_runqueue_resched( &syncrepl_rq, cm->cc_arg, 0 );
}
ldap_pvt_thread_mutex_unlock( &syncrepl_rq.rq_mutex );
}
}
/* free self */
op->o_callback->sc_cleanup = slap_freeself_cb;
}
return SLAP_CB_CONTINUE;
}
static void
add_filter_attrs(
Operation *op,
AttributeName** new_attrs,
AttributeName* attrs,
AttributeName* filter_attrs )
{
int alluser = 0;
int allop = 0;
int i;
int count;
/* duplicate attrs */
if (attrs == NULL) {
count = 1;
} else {
for (count=0; attrs[count].an_name.bv_val; count++)
;
}
*new_attrs = (AttributeName*)(op->o_tmpalloc((count+1)*
sizeof(AttributeName), op->o_tmpmemctx));
if (attrs == NULL) {
(*new_attrs)[0].an_name.bv_val = "*";
(*new_attrs)[0].an_name.bv_len = 1;
(*new_attrs)[1].an_name.bv_val = NULL;
(*new_attrs)[1].an_name.bv_len = 0;
alluser = 1;
allop = 0;
} else {
for (i=0; i<count; i++) {
(*new_attrs)[i].an_name = attrs[i].an_name;
(*new_attrs)[i].an_desc = attrs[i].an_desc;
}
(*new_attrs)[count].an_name.bv_val = NULL;
(*new_attrs)[count].an_name.bv_len = 0;
alluser = an_find(*new_attrs, &AllUser);
allop = an_find(*new_attrs, &AllOper);
}
for ( i=0; filter_attrs[i].an_name.bv_val; i++ ) {
if ( an_find(*new_attrs, &filter_attrs[i].an_name ))
continue;
if ( is_at_operational(filter_attrs[i].an_desc->ad_type) ) {
if (allop)
continue;
} else if (alluser)
continue;
*new_attrs = (AttributeName*)(op->o_tmprealloc(*new_attrs,
(count+2)*sizeof(AttributeName), op->o_tmpmemctx));
(*new_attrs)[count].an_name = filter_attrs[i].an_name;
(*new_attrs)[count].an_desc = filter_attrs[i].an_desc;
count++;
(*new_attrs)[count].an_name.bv_val = NULL;
(*new_attrs)[count].an_name.bv_len = 0;
}
}
static int
proxy_cache_search(
Operation *op,
SlapReply *rs )
{
slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
cache_manager *cm = on->on_bi.bi_private;
query_manager* qm = cm->qm;
int count;
int i = -1;
AttributeName *filter_attrs = NULL;
AttributeName *new_attrs = NULL;
Query query;
int attr_set = -1;
int template_id = -1;
int answerable = 0;
int cacheable = 0;
int fattr_cnt=0;
int oc_attr_absent = 1;
struct berval tempstr;
tempstr.bv_val = op->o_tmpalloc( op->ors_filterstr.bv_len+1, op->o_tmpmemctx );
tempstr.bv_len = 0;
if (filter2template(op->ors_filter, &tempstr, &filter_attrs, &fattr_cnt)) {
op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
return SLAP_CB_CONTINUE;
}
Debug( LDAP_DEBUG_ANY, "query template of incoming query = %s\n",
tempstr.bv_val, 0, 0 );
/* find attr set */
attr_set = get_attr_set(op->ors_attrs, qm, cm->numattrsets);
query.filter = op->ors_filter;
query.attrs = op->ors_attrs;
query.save_attrs = NULL;
query.base = op->o_req_ndn;
query.scope = op->ors_scope;
/* check for query containment */
if (attr_set > -1) {
for (i=0; i<cm->numtemplates; i++) {
/* find if template i can potentially answer tempstr */
if (!is_temp_answerable(attr_set, &tempstr, qm, i))
continue;
if (attr_set == qm->templates[i].attr_set_index) {
cacheable = 1;
template_id = i;
}
Debug( LDAP_DEBUG_NONE, "Entering QC, querystr = %s\n",
op->ors_filterstr.bv_val, 0, 0 );
answerable = (*(qm->qcfunc))(qm, &query, i);
if (answerable)
break;
}
}
op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
query.save_attrs = op->ors_attrs;
query.attrs = NULL;
if (answerable) {
/* Need to clear the callbacks of the original operation,
* in case there are other overlays */
BackendDB *save_bd = op->o_bd;
slap_callback *save_cb = op->o_callback;
Debug( LDAP_DEBUG_ANY, "QUERY ANSWERABLE\n", 0, 0, 0 );
free(filter_attrs);
ldap_pvt_thread_rdwr_runlock(&qm->templates[i].t_rwlock);
op->o_bd = &cm->db;
op->o_callback = NULL;
i = cm->db.bd_info->bi_op_search( op, rs );
op->o_bd = save_bd;
op->o_callback = save_cb;
return i;
}
Debug( LDAP_DEBUG_ANY, "QUERY NOT ANSWERABLE\n", 0, 0, 0 );
ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
if (cm->num_cached_queries >= cm->max_queries) {
cacheable = 0;
}
ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
if (cacheable) {
slap_callback *cb;
struct search_info *si;
Debug( LDAP_DEBUG_ANY, "QUERY CACHEABLE\n", 0, 0, 0 );
query.filter = str2filter(op->ors_filterstr.bv_val);
if (op->ors_attrs) {
for ( count = 0; !BER_BVISNULL( &op->ors_attrs[ count ].an_name ); count++ ) {
if ( op->ors_attrs[count].an_desc == slap_schema.si_ad_objectClass ) {
oc_attr_absent = 0;
}
}
query.attrs = (AttributeName *)ch_malloc( ( count + 1 + oc_attr_absent )
*sizeof(AttributeName) );
for ( count = 0; !BER_BVISNULL( &op->ors_attrs[ count ].an_name ); count++ ) {
ber_dupbv( &query.attrs[count].an_name, &op->ors_attrs[count].an_name );
query.attrs[count].an_desc = op->ors_attrs[count].an_desc;
}
if ( oc_attr_absent ) {
query.attrs[ count ].an_desc = slap_schema.si_ad_objectClass;
ber_dupbv( &query.attrs[count].an_name,
&slap_schema.si_ad_objectClass->ad_cname );
count++;
}
query.attrs[ count ].an_name.bv_val = NULL;
query.attrs[ count ].an_name.bv_len = 0;
}
add_filter_attrs(op, &op->ors_attrs, query.attrs, filter_attrs);
cb = op->o_tmpalloc( sizeof(*cb) + sizeof(*si), op->o_tmpmemctx);
cb->sc_response = proxy_cache_response;
cb->sc_cleanup = NULL;
cb->sc_private = (cb+1);
si = cb->sc_private;
si->on = on;
si->query = query;
si->template_id = template_id;
si->max = cm->num_entries_limit ;
si->over = 0;
si->count = 0;
si->head = NULL;
si->tail = NULL;
if ( cm->response_cb == PCACHE_RESPONSE_CB_HEAD ) {
cb->sc_next = op->o_callback;
op->o_callback = cb;
} else {
slap_callback **pcb;
/* need to move the callback at the end, in case other
* overlays are present, so that the final entry is
* actually cached */
cb->sc_next = NULL;
for ( pcb = &op->o_callback; *pcb; pcb = &(*pcb)->sc_next );
*pcb = cb;
}
} else {
Debug( LDAP_DEBUG_ANY, "QUERY NOT CACHEABLE\n",
0, 0, 0);
}
free(filter_attrs);
return SLAP_CB_CONTINUE;
}
static int
attrscmp(
AttributeName* attrs_in,
AttributeName* attrs)
{
int i, count1, count2;
if ( attrs_in == NULL ) {
return (attrs ? 0 : 1);
}
if ( attrs == NULL )
return 0;
for ( count1=0;
attrs_in && attrs_in[count1].an_name.bv_val != NULL;
count1++ )
;
for ( count2=0;
attrs && attrs[count2].an_name.bv_val != NULL;
count2++)
;
if ( count1 != count2 )
return 0;
for ( i=0; i<count1; i++ ) {
if ( !an_find(attrs, &attrs_in[i].an_name ))
return 0;
}
return 1;
}
static int
get_attr_set(
AttributeName* attrs,
query_manager* qm,
int num )
{
int i;
for (i=0; i<num; i++) {
if (attrscmp(attrs, qm->attr_sets[i].attrs))
return i;
}
return -1;
}
static void*
consistency_check(
void *ctx,
void *arg )
{
struct re_s *rtask = arg;
slap_overinst *on = rtask->arg;
cache_manager *cm = on->on_bi.bi_private;
query_manager *qm = cm->qm;
Operation op = {0};
Connection conn = {0};
SlapReply rs = {REP_RESULT};
CachedQuery* query, *query_prev;
int i, return_val, pause = 1;
QueryTemplate* templ;
connection_fake_init( &conn, &op, ctx );
op.o_bd = &cm->db;
op.o_dn = cm->db.be_rootdn;
op.o_ndn = cm->db.be_rootndn;
cm->cc_arg = arg;
for (i=0; qm->templates[i].querystr.bv_val; i++) {
templ = qm->templates + i;
query = templ->query_last;
if ( query ) pause = 0;
op.o_time = slap_get_time();
ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
while (query && (query->expiry_time < op.o_time)) {
ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
remove_query(qm, query);
ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
Debug( LDAP_DEBUG_ANY, "Lock CR index = %d\n",
i, 0, 0 );
ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
remove_from_template(query, templ);
Debug( LDAP_DEBUG_ANY, "TEMPLATE %d QUERIES-- %d\n",
i, templ->no_of_queries, 0 );
Debug( LDAP_DEBUG_ANY, "Unlock CR index = %d\n",
i, 0, 0 );
ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);
return_val = remove_query_data(&op, &rs, &query->q_uuid);
Debug( LDAP_DEBUG_ANY, "STALE QUERY REMOVED, SIZE=%d\n",
return_val, 0, 0 );
ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
cm->cur_entries -= return_val;
cm->num_cached_queries--;
Debug( LDAP_DEBUG_ANY, "STORED QUERIES = %lu\n",
cm->num_cached_queries, 0, 0 );
ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
Debug( LDAP_DEBUG_ANY,
"STALE QUERY REMOVED, CACHE ="
"%d entries\n",
cm->cur_entries, 0, 0 );
query_prev = query;
query = query->prev;
free_query(query_prev);
}
ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
}
ldap_pvt_thread_mutex_lock( &syncrepl_rq.rq_mutex );
if ( ldap_pvt_runqueue_isrunning( &syncrepl_rq, rtask )) {
ldap_pvt_runqueue_stoptask( &syncrepl_rq, rtask );
}
/* If there were no queries, defer processing for a while */
cm->cc_paused = pause;
ldap_pvt_runqueue_resched( &syncrepl_rq, rtask, pause );
ldap_pvt_thread_mutex_unlock( &syncrepl_rq.rq_mutex );
return NULL;
}
#define MAX_ATTR_SETS 500
static void find_supersets( struct attr_set* attr_sets, int numsets );
static int compare_sets( struct attr_set* setA, int, int );
static int
proxy_cache_config(
BackendDB *be,
const char *fname,
int lineno,
int argc,
char **argv
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
cache_manager* cm = on->on_bi.bi_private;
query_manager* qm = cm->qm;
QueryTemplate* temp;
AttributeName* attr_name;
AttributeName* attrarray;
const char* text=NULL;
char *save_argv0 = NULL;
int index, i;
int num;
int rc = 0;
if ( strncasecmp( argv[0], "proxycache-", STRLENOF( "proxycache-" ) ) == 0 ) {
save_argv0 = argv[0];
argv[0] += STRLENOF( "proxycache-" );
}
if ( strcasecmp( argv[0], "proxycache" ) == 0 ) {
if ( argc < 6 ) {
fprintf( stderr, "%s: line %d: missing arguments in \"proxycache"
" <backend> <max_entries> <numattrsets> <entry limit> "
"<cycle_time>\"\n", fname, lineno );
return( 1 );
}
cm->db.bd_info = backend_info( argv[1] );
if ( !cm->db.bd_info ) {
fprintf( stderr, "%s: line %d: backend %s unknown\n",
fname, lineno, argv[1] );
return( 1 );
}
if ( cm->db.bd_info->bi_db_init( &cm->db ) ) return( 1 );
/* This type is in use, needs to be opened */
cm->db.bd_info->bi_nDB++;
cm->max_entries = atoi( argv[2] );
cm->numattrsets = atoi( argv[3] );
if ( cm->numattrsets > MAX_ATTR_SETS ) {
fprintf( stderr, "%s: line %d: numattrsets must be <= %d\n",
fname, lineno, MAX_ATTR_SETS );
return( 1 );
}
cm->num_entries_limit = atoi( argv[4] );
cm->cc_period = atoi( argv[5] );
Debug( LDAP_DEBUG_ANY,
"Total # of attribute sets to be cached = %d\n",
cm->numattrsets, 0, 0 );
qm->attr_sets = ( struct attr_set * )ch_malloc( cm->numattrsets *
sizeof( struct attr_set ));
for ( i = 0; i < cm->numattrsets; i++ ) {
qm->attr_sets[i].attrs = NULL;
}
} else if ( strcasecmp( argv[0], "proxyattrset" ) == 0 ) {
if ( argc < 3 ) {
fprintf( stderr, "%s: line %d: missing arguments in \"proxyattrset "
"<index> <attributes>\"\n", fname, lineno );
return( 1 );
}
Debug( LDAP_DEBUG_ANY, "Attribute Set # %d\n",
atoi( argv[1] ), 0, 0 );
if (atoi(argv[1]) >= cm->numattrsets) {
fprintf( stderr, "%s; line %d index out of bounds \n",
fname, lineno );
return 1;
}
index = atoi( argv[1] );
if ( argv[2] && strcmp( argv[2], "*" ) ) {
qm->attr_sets[index].count = argc - 2;
qm->attr_sets[index].attrs = (AttributeName*)ch_malloc(
(argc-1) * sizeof( AttributeName ));
attr_name = qm->attr_sets[index].attrs;
for ( i = 2; i < argc; i++ ) {
Debug( LDAP_DEBUG_ANY, "\t %s\n",
argv[i], 0, 0 );
ber_str2bv( argv[i], 0, 1,
&attr_name->an_name);
attr_name->an_desc = NULL;
slap_bv2ad( &attr_name->an_name,
&attr_name->an_desc, &text );
attr_name++;
attr_name->an_name.bv_val = NULL;
attr_name->an_name.bv_len = 0;
}
}
} else if ( strcasecmp( argv[0], "proxytemplate" ) == 0 ) {
if ( argc != 4 ) {
fprintf( stderr, "%s: line %d: missing argument(s) in "
"\"proxytemplate <filter> <proj attr set> <TTL>\" line\n",
fname, lineno );
return( 1 );
}
if (( i = atoi( argv[2] )) >= cm->numattrsets ) {
Debug( LDAP_DEBUG_ANY,
"%s: line %d, template index invalid\n",
fname, lineno, 0 );
return 1;
}
num = cm->numtemplates;
if ( num == 0 )
find_supersets( qm->attr_sets, cm->numattrsets );
qm->templates = ( QueryTemplate* )ch_realloc( qm->templates,
( num + 2 ) * sizeof( QueryTemplate ));
temp = qm->templates + num;
ldap_pvt_thread_rdwr_init( &temp->t_rwlock );
temp->query = temp->query_last = NULL;
temp->ttl = atoi( argv[3] );
temp->no_of_queries = 0;
if ( argv[1] == NULL ) {
Debug( LDAP_DEBUG_ANY,
"Templates string not specified "
"for template %d\n", num, 0, 0 );
return 1;
}
ber_str2bv( argv[1], 0, 1, &temp->querystr );
Debug( LDAP_DEBUG_ANY, "Template:\n", 0, 0, 0 );
Debug( LDAP_DEBUG_ANY, " query template: %s\n",
temp->querystr.bv_val, 0, 0 );
temp->attr_set_index = i;
Debug( LDAP_DEBUG_ANY, " attributes: \n", 0, 0, 0 );
if ( ( attrarray = qm->attr_sets[i].attrs ) != NULL ) {
for ( i=0; attrarray[i].an_name.bv_val; i++ )
Debug( LDAP_DEBUG_ANY, "\t%s\n",
attrarray[i].an_name.bv_val, 0, 0 );
}
temp++;
temp->querystr.bv_val = NULL;
cm->numtemplates++;
} else if ( strcasecmp( argv[0], "response-callback" ) == 0 ) {
/* set to "tail" to put the response callback
* at the end of the callback list; this is required
* in case other overlays are present, so that the
* final entry is cached. */
if ( argc < 2 ) {
Debug( LDAP_DEBUG_ANY,
"missing specifier for \"response-callback {head(default)|tail}\" "
"callback position\n", 0, 0, 0 );
return 1;
}
if ( strcasecmp( argv[1], "head" ) == 0 ) {
cm->response_cb = PCACHE_RESPONSE_CB_HEAD;
} else if ( strcasecmp( argv[1], "tail" ) == 0 ) {
cm->response_cb = PCACHE_RESPONSE_CB_TAIL;
} else {
Debug( LDAP_DEBUG_ANY,
"unknown specifier %s for \"response-callback {head(default)|tail}\" "
"callback position\n", argv[1], 0, 0 );
return 1;
}
}
/* anything else */
else {
rc = cm->db.bd_info->bi_db_config( &cm->db, fname, lineno, argc, argv );
}
if ( save_argv0 ) {
argv[0] = save_argv0;
}
return rc;
}
static int
proxy_cache_init(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
cache_manager *cm;
query_manager *qm;
cm = (cache_manager *)ch_malloc(sizeof(cache_manager));
on->on_bi.bi_private = cm;
qm = (query_manager*)ch_malloc(sizeof(query_manager));
cm->db = *be;
SLAP_DBFLAGS(&cm->db) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
cm->db.be_private = NULL;
cm->db.be_pcl_mutexp = &cm->db.be_pcl_mutex;
cm->qm = qm;
cm->numattrsets = 0;
cm->numtemplates = 0;
cm->num_entries_limit = 5;
cm->num_cached_queries = 0;
cm->max_entries = 0;
cm->cur_entries = 0;
cm->max_queries = 10000;
cm->response_cb = PCACHE_RESPONSE_CB_TAIL;
cm->cc_period = 1000;
cm->cc_paused = 0;
qm->attr_sets = NULL;
qm->templates = NULL;
qm->lru_top = NULL;
qm->lru_bottom = NULL;
qm->qcfunc = query_containment;
qm->crfunc = cache_replacement;
qm->addfunc = add_query;
ldap_pvt_thread_mutex_init(&qm->lru_mutex);
ldap_pvt_thread_mutex_init(&cm->cache_mutex);
ldap_pvt_thread_mutex_init(&cm->remove_mutex);
return 0;
}
static int
proxy_cache_open(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
cache_manager *cm = on->on_bi.bi_private;
int rc = 0;
int i;
/* consistency check (add more...) */
for ( i = 0; i < cm->numattrsets; i++ ) {
if ( cm->qm->attr_sets[i].attrs == NULL ) {
fprintf( stderr, "proxy_cache_open(): "
"attr set %d (of %d) missing\n",
i, cm->numattrsets );
return 1;
}
}
rc = backend_startup_one( &cm->db );
/* There is no runqueue in TOOL mode */
if ( slapMode & SLAP_SERVER_MODE ) {
ldap_pvt_thread_mutex_lock( &syncrepl_rq.rq_mutex );
ldap_pvt_runqueue_insert( &syncrepl_rq, cm->cc_period,
consistency_check, on );
ldap_pvt_thread_mutex_unlock( &syncrepl_rq.rq_mutex );
/* Cached database must have the rootdn */
if ( BER_BVISNULL( &cm->db.be_rootndn )
|| BER_BVISEMPTY( &cm->db.be_rootndn ) )
{
fprintf( stderr, "proxy_cache_open(): "
"underlying database of type \"%s\"\n"
" serving naming context \"%s\"\n"
" has no \"rootdn\", required by \"proxycache\".\n",
on->on_info->oi_orig->bi_type,
cm->db.be_suffix[0].bv_val );
return 1;
}
}
return rc;
}
static int
proxy_cache_close(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
cache_manager *cm = on->on_bi.bi_private;
query_manager *qm = cm->qm;
int i, j, rc = 0;
if ( cm->db.bd_info->bi_db_close ) {
rc = cm->db.bd_info->bi_db_close( &cm->db );
}
for ( i=0; i<cm->numtemplates; i++ ) {
CachedQuery *qc, *qn;
for ( qc = qm->templates[i].query; qc; qc = qn ) {
qn = qc->next;
free_query( qc );
}
free( qm->templates[i].querystr.bv_val );
ldap_pvt_thread_rdwr_destroy( &qm->templates[i].t_rwlock );
}
free( qm->templates );
qm->templates = NULL;
for ( i=0; i<cm->numattrsets; i++ ) {
free( qm->attr_sets[i].ID_array );
for ( j=0; j<qm->attr_sets[i].count; j++ ) {
free( qm->attr_sets[i].attrs[j].an_name.bv_val );
}
free( qm->attr_sets[i].attrs );
}
free( qm->attr_sets );
qm->attr_sets = NULL;
return rc;
}
static int
proxy_cache_destroy(
BackendDB *be
)
{
slap_overinst *on = (slap_overinst *)be->bd_info;
cache_manager *cm = on->on_bi.bi_private;
query_manager *qm = cm->qm;
int rc = 0;
if ( cm->db.bd_info->bi_db_destroy ) {
rc = cm->db.bd_info->bi_db_destroy( &cm->db );
}
ldap_pvt_thread_mutex_destroy(&qm->lru_mutex);
ldap_pvt_thread_mutex_destroy(&cm->cache_mutex);
ldap_pvt_thread_mutex_destroy(&cm->remove_mutex);
free( qm );
free( cm );
return rc;
}
static void
find_supersets ( struct attr_set* attr_sets, int numsets )
{
int num[MAX_ATTR_SETS];
int i, j, res;
int* id_array;
for ( i = 0; i < MAX_ATTR_SETS; i++ )
num[i] = 0;
for ( i = 0; i < numsets; i++ ) {
attr_sets[i].ID_array = (int*) ch_malloc( sizeof( int ) );
attr_sets[i].ID_array[0] = -1;
}
for ( i = 0; i < numsets; i++ ) {
for ( j=i+1; j < numsets; j++ ) {
res = compare_sets( attr_sets, i, j );
switch ( res ) {
case 0:
break;
case 3:
case 1:
id_array = attr_sets[i].ID_array;
attr_sets[i].ID_array = (int *) ch_realloc( id_array,
( num[i] + 2 ) * sizeof( int ));
attr_sets[i].ID_array[num[i]] = j;
attr_sets[i].ID_array[num[i]+1] = -1;
num[i]++;
if (res == 1)
break;
case 2:
id_array = attr_sets[j].ID_array;
attr_sets[j].ID_array = (int *) ch_realloc( id_array,
( num[j] + 2 ) * sizeof( int ));
attr_sets[j].ID_array[num[j]] = i;
attr_sets[j].ID_array[num[j]+1] = -1;
num[j]++;
break;
}
}
}
}
/*
* compares two sets of attributes (indices i and j)
* returns 0: if neither set is contained in the other set
* 1: if set i is contained in set j
* 2: if set j is contained in set i
* 3: the sets are equivalent
*/
static int
compare_sets(struct attr_set* set, int i, int j)
{
int k,l,numI,numJ;
int common=0;
int result=0;
if (( set[i].attrs == NULL ) && ( set[j].attrs == NULL ))
return 3;
if ( set[i].attrs == NULL )
return 2;
if ( set[j].attrs == NULL )
return 1;
numI = set[i].count;
numJ = set[j].count;
for ( l=0; l < numI; l++ ) {
for ( k = 0; k < numJ; k++ ) {
if ( strcmp( set[i].attrs[l].an_name.bv_val,
set[j].attrs[k].an_name.bv_val ) == 0 )
common++;
}
}
if ( common == numI )
result = 1;
if ( common == numJ )
result += 2;
return result;
}
static slap_overinst proxy_cache;
int pcache_init()
{
LDAPAttributeType *at;
int code;
const char *err;
at = ldap_str2attributetype( queryid_schema, &code, &err,
LDAP_SCHEMA_ALLOW_ALL );
if ( !at ) {
fprintf( stderr, "AttributeType Load failed %s %s\n",
ldap_scherr2str(code), err );
return code;
}
code = at_add( at, &err );
if ( !code ) {
slap_str2ad( at->at_names[0], &ad_queryid, &err );
}
ldap_memfree( at );
if ( code ) {
fprintf( stderr, "AttributeType Load failed %s %s\n",
scherr2str(code), err );
return code;
}
proxy_cache.on_bi.bi_type = "proxycache";
proxy_cache.on_bi.bi_db_init = proxy_cache_init;
proxy_cache.on_bi.bi_db_config = proxy_cache_config;
proxy_cache.on_bi.bi_db_open = proxy_cache_open;
proxy_cache.on_bi.bi_db_close = proxy_cache_close;
proxy_cache.on_bi.bi_db_destroy = proxy_cache_destroy;
proxy_cache.on_bi.bi_op_search = proxy_cache_search;
return overlay_register( &proxy_cache );
}
#if SLAPD_OVER_PROXYCACHE == SLAPD_MOD_DYNAMIC
int init_module(int argc, char *argv[]) {
return pcache_init();
}
#endif
#endif /* defined(SLAPD_OVER_PROXYCACHE) */
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