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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 "limiter.h"
#include "connection-protected.h"
#include "bogotime.h"
#include "thread.h"

ret_t
cherokee_limiter_init (cherokee_limiter_t *limiter)
{
INIT_LIST_HEAD (&limiter->conns);
limiter->conns_num = 0;

return ret_ok;
}


ret_t
cherokee_limiter_mrproper (cherokee_limiter_t *limiter)
{
cherokee_list_t *i, *tmp;

list_for_each_safe (i, tmp, &limiter->conns) {
cherokee_connection_free (CONN(i));
}

return ret_ok;
}


ret_t
cherokee_limiter_add_conn (cherokee_limiter_t *limiter,
void *conn)
{
cherokee_list_t *i;
cherokee_list_t *prev;

/* Enlist the connection. Shorted insert by unblocking order
*/
prev = &limiter->conns;
list_for_each (i, &limiter->conns) {
if (CONN(i)->limit_blocked_until > CONN(conn)->limit_blocked_until)
break;

prev = i;
}

limiter->conns_num++;
cherokee_list_add (LIST(conn), prev);

return ret_ok;
}


cherokee_msec_t
cherokee_limiter_get_time_limit (cherokee_limiter_t *limiter,
cherokee_msec_t fdwatch_msecs)
{
long long time_delta;
cherokee_connection_t *conn;

/* Shortcut
*/
if ((fdwatch_msecs == 0) ||
(limiter->conns_num == 0))
{
return fdwatch_msecs;
}

/* Pick the first connection
*/
conn = CONN(limiter->conns.next);

/* Return the delta time of the first connection (the
* connection that will be enabled sooner)
*/
time_delta = conn->limit_blocked_until - cherokee_bogonow_msec;
if (unlikely (time_delta <= 0)) {
return 0;
}

/* Check as 'signed long long' */
return MIN(time_delta, (long long)fdwatch_msecs);
}


ret_t
cherokee_limiter_reactive (cherokee_limiter_t *limiter,
void *thread)
{
cherokee_list_t *i, *tmp;

list_for_each_safe (i, tmp, &limiter->conns) {
/* Check whether the limit has expired
*/
if (CONN(i)->limit_blocked_until > cherokee_bogonow_msec)
break;

/* Re-active the connection
*/
limiter->conns_num--;
cherokee_list_del(i);

CONN(i)->limit_blocked_until = 0;
cherokee_thread_inject_active_connection (thread, CONN(i));
}

return ret_ok;
}
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