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153 lines
3.0 KiB
153 lines
3.0 KiB
/*
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* $Id$
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*
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* Flatstore module connection pool
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*
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* Copyright (C) 2004 FhG Fokus
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* Kamailio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <unistd.h>
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#include "../../dprint.h"
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#include "km_flat_pool.h"
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#include "km_flat_id.h"
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/* The head of the pool */
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static struct flat_con* pool = 0;
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/*
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* Pid of the process that added the last
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* connection to the pool. This is used to
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* check for inherited database connections.
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*/
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static int pool_pid;
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/*
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* Get a connection from the pool, reuse existing
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* if possible, otherwise create a new one
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*/
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struct flat_con* flat_get_connection(char* dir, char* table)
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{
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struct flat_id* id;
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struct flat_con* ptr;
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int pid;
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if (!dir || !table) {
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LM_ERR("invalid parameter value\n");
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return 0;
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}
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pid = getpid();
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if (pool && (pool_pid != pid)) {
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LM_ERR("inherited open database connections, "
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"this is not a good idea\n");
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return 0;
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}
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pool_pid = pid;
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id = new_flat_id(dir, table);
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if (!id) return 0;
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ptr = pool;
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while (ptr) {
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if (cmp_flat_id(id, ptr->id)) {
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LM_DBG("connection found in the pool\n");
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ptr->ref++;
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free_flat_id(id);
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return ptr;
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}
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ptr = ptr->next;
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}
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LM_DBG("connection not found in the pool\n");
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ptr = flat_new_connection(id);
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if (!ptr) {
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free_flat_id(id);
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return 0;
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}
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ptr->next = pool;
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pool = ptr;
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return ptr;
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}
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/*
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* Release a connection, the connection will be left
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* in the pool if ref count != 0, otherwise it
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* will be delete completely
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*/
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void flat_release_connection(struct flat_con* con)
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{
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struct flat_con* ptr;
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if (!con) return;
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if (con->ref > 1) {
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/* There are still other users, just
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* decrease the reference count and return
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*/
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LM_DBG("connection still kept in the pool\n");
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con->ref--;
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return;
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}
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LM_DBG("removing connection from the pool\n");
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if (pool == con) {
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pool = pool->next;
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} else {
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ptr = pool;
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while(ptr) {
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if (ptr->next == con) break;
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ptr = ptr->next;
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}
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if (!ptr) {
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LM_ERR("weird, connection not found in the pool\n");
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} else {
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/* Remove the connection from the pool */
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ptr->next = con->next;
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}
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}
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flat_free_connection(con);
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}
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/*
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* Close and reopen all opened connections
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*/
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int flat_rotate_logs(void)
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{
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struct flat_con* ptr;
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ptr = pool;
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while(ptr) {
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if (flat_reopen_connection(ptr)) {
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return -1;
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}
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ptr = ptr->next;
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}
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return 0;
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}
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