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balancer.c
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balancer.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2010 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "common-internal.h"
#include "balancer.h"
#include "plugin_loader.h"
#include "server-protected.h"
#include "source_interpreter.h"
/* Balancer Entry
*/
static ret_t
entry_new (cherokee_balancer_entry_t **entry)
{
CHEROKEE_NEW_STRUCT (n, balancer_entry);
INIT_LIST_HEAD (&n->listed);
n->source = NULL;
n->disabled = false;
n->disabled_until = 0;
*entry = n;
return ret_ok;
}
static ret_t
entry_free (cherokee_balancer_entry_t *entry)
{
free (entry);
return ret_ok;
}
/* Balancer
*/
ret_t
cherokee_balancer_init_base (cherokee_balancer_t *balancer, cherokee_plugin_info_t *info)
{
/* Init the base class
*/
cherokee_module_init_base (MODULE(balancer), NULL, info);
/* Virtual methods
*/
balancer->dispatch = NULL;
balancer->configure = NULL;
balancer->report_fail = NULL;
/* Properties
*/
INIT_LIST_HEAD (&balancer->entries);
balancer->entries_len = 0;
return ret_ok;
}
ret_t
cherokee_balancer_mrproper (cherokee_balancer_t *balancer)
{
cherokee_list_t *i, *tmp;
list_for_each_safe (i, tmp, &balancer->entries) {
/* It doesn't free the sources. They are rather freed
* from srv->sources.
*/
cherokee_list_del (i);
entry_free (BAL_ENTRY(i));
}
return ret_ok;
}
static ret_t
add_source (cherokee_balancer_t *balancer, cherokee_source_t *source)
{
ret_t ret;
cherokee_balancer_entry_t *entry;
/* Instance a new balancer entry
*/
ret = entry_new (&entry);
if (ret != ret_ok)
return ret;
entry->source = source;
/* Add it to the list
*/
cherokee_list_add_tail (&entry->listed, &balancer->entries);
balancer->entries_len += 1;
return ret_ok;
}
ret_t
cherokee_balancer_configure_base (cherokee_balancer_t *balancer,
cherokee_server_t *srv,
cherokee_config_node_t *conf)
{
ret_t ret;
cherokee_list_t *i;
cherokee_source_t *src;
cherokee_config_node_t *subconf = NULL;
cherokee_config_node_t *subconf2 = NULL;
/* Look for the type of the source objects
*/
ret = cherokee_config_node_get (conf, "source", &subconf);
if (ret != ret_ok) {
LOG_ERROR (CHEROKEE_ERROR_BALANCER_NO_KEY, "source");
return ret_error;
}
cherokee_config_node_foreach (i, subconf) {
subconf2 = CONFIG_NODE(i);
ret = cherokee_avl_get (&srv->sources, &subconf2->val, (void **)&src);
if (ret != ret_ok) {
LOG_ERROR (CHEROKEE_ERROR_BALANCER_BAD_SOURCE, subconf2->val.buf);
return ret_error;
}
add_source (balancer, src);
}
return ret_ok;
}
ret_t
cherokee_balancer_dispatch (cherokee_balancer_t *balancer,
cherokee_connection_t *conn,
cherokee_source_t **source)
{
if (unlikely (balancer->dispatch == NULL))
return ret_error;
return balancer->dispatch (balancer, conn, source);
}
ret_t
cherokee_balancer_report_fail (cherokee_balancer_t *balancer,
cherokee_connection_t *conn,
cherokee_source_t *source)
{
if (unlikely (balancer->report_fail == NULL))
return ret_error;
return balancer->report_fail (balancer, conn, source);
}
ret_t
cherokee_balancer_free (cherokee_balancer_t *bal)
{
ret_t ret;
cherokee_module_t *module = MODULE(bal);
/* Sanity check
*/
if (module->free == NULL) {
return ret_error;
}
/* Call the virtual method implementation
*/
ret = MODULE(bal)->free (bal);
if (unlikely (ret < ret_ok))
return ret;
/* Free the rest
*/
cherokee_balancer_mrproper(bal);
free (bal);
return ret_ok;
}
ret_t
cherokee_balancer_instance (cherokee_buffer_t *name,
cherokee_config_node_t *conf,
cherokee_server_t *srv,
cherokee_balancer_t **balancer)
{
ret_t ret;
balancer_new_func_t new_func;
balancer_configure_func_t config_func;
cherokee_plugin_info_t *info = NULL;
if (cherokee_buffer_is_empty (name)) {
LOG_CRITICAL_S (CHEROKEE_ERROR_BALANCER_UNDEFINED);
return ret_error;
}
ret = cherokee_plugin_loader_get (&srv->loader, name->buf, &info);
if (ret != ret_ok) return ret;
new_func = (balancer_new_func_t) info->instance;
ret = new_func (balancer);
if (ret != ret_ok) return ret;
config_func = (balancer_configure_func_t) info->configure;
ret = config_func (*balancer, srv, conf);
if (ret != ret_ok) return ret;
return ret_ok;
}