/* 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; }