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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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 3 of the License, or
(at your option) any later version.
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, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <pthread.h>
#include <stdbool.h>
#include <sys/socket.h>
#include "contrib/time.h"
typedef struct {
struct sockaddr_storage src;
struct sockaddr_storage dst;
int fd;
knot_time_t last_active;
} conn_pool_memb_t;
typedef struct {
size_t capacity;
size_t usage;
knot_timediff_t timeout;
pthread_mutex_t mutex;
pthread_t closing_thread;
conn_pool_memb_t conns[];
} conn_pool_t;
extern conn_pool_t *global_conn_pool;
/*!
* \brief Allocate connection pool.
*
* \param capacity Connection pool capacity (must be positive number).
* \param timeout Connection timeout (must be positive number).
*
* \return Connection pool or NULL if error.
*/
conn_pool_t *conn_pool_init(size_t capacity, knot_timediff_t timeout);
/*!
* \brief Deallocate the pool, close all connections, terminate closing thread.
*
* \param pool Connection pool.
*/
void conn_pool_deinit(conn_pool_t *pool);
/*!
* \brief Get and/or set connection timeout.
*
* \param pool Connection pool.
* \param new_timeout Optional: set new timeout (if positive number).
*
* \return Previous value of timeout.
*/
knot_timediff_t conn_pool_timeout(conn_pool_t *pool,
knot_timediff_t new_timeout);
/*!
* \brief Try to get an open connection if present, check if alive.
*
* \param pool Pool to search in.
* \param src Connection source address.
* \param dst Connection destination address.
*
* \retval -1 If error (no such connection).
* \return >= 0 File descriptor of the connection.
*/
int conn_pool_get(conn_pool_t *pool,
struct sockaddr_storage *src,
struct sockaddr_storage *dst);
/*!
* \brief Put an open connection to the pool, possibly displacing the oldest one there.
*
* \param pool Pool to insert into.
* \param src Connestion source address.
* \param dst Connection destination adress.
* \param fd Connection file descriptor.
*
* \retval -1 If connection stored to free slot.
* \retval fd If not able to store connection.
* \return >= 0 File descriptor of the displaced old connection.
*/
int conn_pool_put(conn_pool_t *pool,
struct sockaddr_storage *src,
struct sockaddr_storage *dst,
int fd);
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