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pool.h
/* TDSPool - Connection pooling for TDS based databases
* Copyright (C) 2001 Brian Bruns
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _pool_h_
#define _pool_h_
#include <assert.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
/*
* POSIX says fd_set type may be defined in either sys/select.h or sys/time.h.
*/
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_POLL_H
#include <poll.h>
#endif /* HAVE_POLL_H */
#include <freetds/tds.h>
#include <freetds/utils/dlist.h>
#include <freetds/replacements.h>
/* defines */
#define PGSIZ 2048
#define BLOCKSIZ 512
#define MAX_POOL_USERS 1024
/* enums and typedefs */
typedef enum
{
TDS_SRV_WAIT, /* if no members are free wait */
TDS_SRV_QUERY,
} TDS_USER_STATE;
/* forward declaration */
typedef struct tds_pool_event TDS_POOL_EVENT;
typedef struct tds_pool_socket TDS_POOL_SOCKET;
typedef struct tds_pool_member TDS_POOL_MEMBER;
typedef struct tds_pool_user TDS_POOL_USER;
typedef struct tds_pool TDS_POOL;
typedef void (*TDS_POOL_EXECUTE)(TDS_POOL_EVENT *event);
struct tds_pool_event
{
TDS_POOL_EVENT *next;
TDS_POOL_EXECUTE execute;
};
struct tds_pool_socket
{
TDSSOCKET *tds;
uint32_t poll_index;
bool poll_recv;
bool poll_send;
};
struct tds_pool_user
{
TDS_POOL_SOCKET sock;
DLIST_FIELDS(dlist_user_item);
TDSLOGIN *login;
TDS_USER_STATE user_state;
TDS_POOL_MEMBER *assigned_member;
};
struct tds_pool_member
{
TDS_POOL_SOCKET sock;
DLIST_FIELDS(dlist_member_item);
bool doing_async;
time_t last_used_tm;
TDS_POOL_USER *current_user;
};
#define DLIST_PREFIX dlist_member
#define DLIST_LIST_TYPE dlist_members
#define DLIST_ITEM_TYPE TDS_POOL_MEMBER
#include <freetds/utils/dlist.tmpl.h>
#define DLIST_PREFIX dlist_user
#define DLIST_LIST_TYPE dlist_users
#define DLIST_ITEM_TYPE TDS_POOL_USER
#include <freetds/utils/dlist.tmpl.h>
struct tds_pool
{
char *name;
char *user;
char *password;
char *server;
char *database;
char *server_user;
char *server_password;
int port;
int max_member_age; /* in seconds */
int min_open_conn;
int max_open_conn;
tds_mutex events_mtx;
TDS_SYS_SOCKET listen_fd;
TDS_SYS_SOCKET wakeup_fd;
TDS_SYS_SOCKET event_fd;
TDS_POOL_EVENT *events;
int num_active_members;
dlist_members active_members;
dlist_members idle_members;
dlist_users waiters;
int num_users;
dlist_users users;
TDSCONTEXT *ctx;
unsigned long user_logins;
unsigned long member_logins;
};
/* prototypes */
/* member.c */
int pool_process_members(TDS_POOL * pool, struct pollfd *fds, unsigned num_fds);
TDS_POOL_MEMBER *pool_assign_idle_member(TDS_POOL * pool, TDS_POOL_USER *user);
void pool_mbr_init(TDS_POOL * pool);
void pool_mbr_destroy(TDS_POOL * pool);
void pool_free_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
void pool_assign_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr, TDS_POOL_USER *puser);
void pool_deassign_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
void pool_reset_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
bool pool_packet_read(TDSSOCKET * tds);
/* user.c */
void pool_process_users(TDS_POOL * pool, struct pollfd *fds, unsigned num_fds);
void pool_user_init(TDS_POOL * pool);
void pool_user_destroy(TDS_POOL * pool);
TDS_POOL_USER *pool_user_create(TDS_POOL * pool, TDS_SYS_SOCKET s);
void pool_free_user(TDS_POOL * pool, TDS_POOL_USER * puser);
void pool_user_query(TDS_POOL * pool, TDS_POOL_USER * puser);
bool pool_user_send_login_ack(TDS_POOL * pool, TDS_POOL_USER * puser);
void pool_user_finish_login(TDS_POOL * pool, TDS_POOL_USER * puser);
/* util.c */
void dump_login(TDSLOGIN * login);
void pool_event_add(TDS_POOL *pool, TDS_POOL_EVENT *ev, TDS_POOL_EXECUTE execute);
int pool_write(TDS_SYS_SOCKET sock, const void *buf, size_t len);
bool pool_write_data(TDS_POOL_SOCKET *from, TDS_POOL_SOCKET *to);
/* config.c */
bool pool_read_conf_files(const char *path, const char *poolname, TDS_POOL * pool, char **err);
#endif
tds.h
Main include file for libtds.
poll.h
Provide poll call where missing.
tds_pool_event
Definition pool.h:69
tds_pool_socket
Definition pool.h:75
tds_pool_user
Definition pool.h:83
tds_pool_member
Definition pool.h:92
tds_pool
Definition pool.h:111
tds_pool::waiters
dlist_users waiters
users in wait state
Definition pool.h:134
pollfd
Definition poll.h:52
tds_login
Definition tds.h:518
tds_context
Definition tds.h:1033
tds_socket
Information for a server connection.
Definition tds.h:1180