/*
 * PIKE module
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#include "../../core/sr_module.h"
#include "../../core/error.h"
#include "../../core/dprint.h"
#include "../../core/ut.h"
#include "../../core/mem/shm_mem.h"
#include "../../core/timer.h"
#include "../../core/locking.h"
#include "../../core/kemi.h"
#include "../../core/mod_fix.h"
#include "ip_tree.h"
#include "timer.h"
#include "pike_funcs.h"
#include "../../core/rpc_lookup.h"
#include "pike_rpc.h"

MODULE_VERSION


static int pike_init(void);
void pike_exit(void);


/* parameters */
static int pike_time_unit = 2;
static int pike_max_reqs = 30;
int pike_timeout = 120;
int pike_log_level = L_WARN;

/* global variables */
gen_lock_t *pike_timer_lock = 0;
pike_list_link_t *pike_timer = 0;


static cmd_export_t cmds[] = {{"pike_check_req", (cmd_function)w_pike_check_req,
									  0, 0, 0, REQUEST_ROUTE | ONREPLY_ROUTE},
		{"pike_check_ip", (cmd_function)w_pike_check_ip, 1, fixup_spve_null,
				fixup_free_spve_null, REQUEST_ROUTE | ONREPLY_ROUTE},
		{0, 0, 0, 0, 0, 0}};

static param_export_t params[] = {
		{"sampling_time_unit", INT_PARAM, &pike_time_unit},
		{"reqs_density_per_unit", INT_PARAM, &pike_max_reqs},
		{"remove_latency", INT_PARAM, &pike_timeout},
		{"pike_log_level", INT_PARAM, &pike_log_level}, {0, 0, 0}};


struct module_exports exports = {
		"pike",			 /* module name */
		DEFAULT_DLFLAGS, /* dlopen flags */
		cmds,			 /* cmd exports */
		params,			 /* param exports */
		0,				 /* RPC method exports */
		0,				 /* exported pseudo-variables */
		0,				 /* response handling function */
		pike_init,		 /* module initialization function */
		0,				 /* per-child init function */
		pike_exit		 /* module exit function */
};


static int pike_init(void)
{
	LOG(L_INFO, "PIKE - initializing\n");

	if(rpc_register_array(pike_rpc_methods) != 0) {
		LM_ERR("failed to register RPC commands\n");
		return -1;
	}

	/* alloc the timer lock */
	pike_timer_lock = lock_alloc();
	if(pike_timer_lock == 0) {
		LM_ERR(" alloc locks failed!\n");
		goto error1;
	}
	/* init the lock */
	if(lock_init(pike_timer_lock) == 0) {
		LM_ERR(" init lock failed\n");
		goto error1;
	}

	/* init the IP tree */
	if(init_ip_tree(pike_max_reqs) != 0) {
		LM_ERR(" ip_tree creation failed!\n");
		goto error2;
	}

	/* init timer list */
	pike_timer = (pike_list_link_t *)shm_malloc(sizeof(pike_list_link_t));
	if(pike_timer == 0) {
		LM_ERR("cannot alloc shm mem for timer!\n");
		goto error3;
	}
	pike_timer->next = pike_timer->prev = pike_timer;

	/* registering timing functions  */
	register_timer(clean_routine, 0, 1);
	register_timer(swap_routine, 0, pike_time_unit);

	/* Register counter */
	pike_counter_init();

	return 0;
error3:
	destroy_ip_tree();
error2:
	lock_destroy(pike_timer_lock);
error1:
	if(pike_timer_lock)
		lock_dealloc(pike_timer_lock);
	pike_timer_lock = 0;
	return -1;
}


void pike_exit(void)
{
	/* destroy semaphore */
	if(pike_timer_lock) {
		lock_destroy(pike_timer_lock);
		lock_dealloc(pike_timer_lock);
	}

	/* empty the timer list head */
	if(pike_timer) {
		shm_free(pike_timer);
		pike_timer = 0;
	}

	/* destroy the IP tree */
	destroy_ip_tree();

	return;
}

/**
 *
 */
/* clang-format off */
static sr_kemi_t sr_kemi_pike_exports[] = {
	{ str_init("pike"), str_init("pike_check_req"),
		SR_KEMIP_INT, pike_check_req,
		{ SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},
	{ str_init("pike"), str_init("pike_check_ip"),
		SR_KEMIP_INT, pike_check_ip,
		{ SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE,
			SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
	},

	{ {0, 0}, {0, 0}, 0, NULL, { 0, 0, 0, 0, 0, 0 } }
};
/* clang-format on */

/**
 *
 */
int mod_register(char *path, int *dlflags, void *p1, void *p2)
{
	sr_kemi_modules_add(sr_kemi_pike_exports);
	return 0;
}
