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/* Copyright (c) 2016-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "llist.h"
#include "ldap-private.h"
#include "ldap-connection-pool.h"
struct ldap_connection_pool {
struct ldap_connection_list *conn_list;
unsigned int conn_count;
unsigned int max_connections;
};
static void ldap_connection_list_remove(struct ldap_connection_pool *pool,
struct ldap_connection_list *list)
{
DLLIST_REMOVE(&pool->conn_list, list);
pool->conn_count--;
ldap_connection_deinit(&list->conn);
i_free(list);
}
static void
ldap_connection_pool_shrink_to(struct ldap_connection_pool *pool,
unsigned int max_count)
{
struct ldap_connection_list *list, *next;
list = pool->conn_list;
for (; list != NULL && pool->conn_count > max_count; list = next) {
next = list->next;
if (list->refcount == 0)
ldap_connection_list_remove(pool, list);
}
}
struct ldap_connection_pool *
ldap_connection_pool_init(unsigned int max_connections)
{
struct ldap_connection_pool *pool;
pool = i_new(struct ldap_connection_pool, 1);
pool->max_connections = max_connections;
return pool;
}
void ldap_connection_pool_deinit(struct ldap_connection_pool **_pool)
{
struct ldap_connection_pool *pool = *_pool;
*_pool = NULL;
ldap_connection_pool_shrink_to(pool, 0);
i_assert(pool->conn_list == NULL);
i_free(pool);
}
int ldap_connection_pool_get(struct ldap_connection_pool *pool,
struct ldap_client *client,
const struct ldap_client_settings *set,
struct ldap_connection_list **list_r,
const char **error_r)
{
struct ldap_connection_list *list;
struct ldap_connection *conn;
for (list = pool->conn_list; list != NULL; list = list->next) {
if (ldap_connection_have_settings(list->conn, set)) {
list->refcount++;
*list_r = list;
return 0;
}
}
if (ldap_connection_init(client, set, &conn, error_r) < 0)
return -1;
list = i_new(struct ldap_connection_list, 1);
list->conn = conn;
list->refcount++;
DLLIST_PREPEND(&pool->conn_list, list);
pool->conn_count++;
ldap_connection_pool_shrink_to(pool, pool->max_connections);
*list_r = list;
return 0;
}
void ldap_connection_pool_unref(struct ldap_connection_pool *pool,
struct ldap_connection_list **_list)
{
struct ldap_connection_list *list = *_list;
*_list = NULL;
i_assert(list->refcount > 0);
if (--list->refcount == 0)
ldap_connection_pool_shrink_to(pool, pool->max_connections);
}
bool ldap_connection_pool_have_references(struct ldap_connection_pool *pool)
{
struct ldap_connection_list *list;
for (list = pool->conn_list; list != NULL; list = list->next) {
if (list->refcount > 0)
return TRUE;
}
return FALSE;
}
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