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cachedb_sql.c
591 lines (489 loc) · 14.8 KB
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cachedb_sql.c
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/*
* Copyright (C) 2013 Steve Frécinaux
* Be IP s.a. http://www.beip.be
* Copyright (C) 2013 OpenSIPS Solutions
*
* This file is part of opensips, a free SIP server.
*
* opensips 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.
*
* opensips 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.
*
*
* history:
* ---------
* 2013-01-xx created (Steve Frécinaux)
* 2013-01-xx improved implementation of cachedb (vlad-paiu)
* 2014-05-xx full rework of the connection management (vlad-paiu)
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "../../cachedb/cachedb.h"
#include "../../db/db.h"
#include "../../timer.h"
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"
typedef struct {
struct cachedb_id *id;
unsigned int ref;
struct cachedb_pool_con_t *next;
db_con_t* cdb_db_handle;
db_func_t cdb_dbf;
} cachedbsql_con;
#define MAX_RAW_QUERY_SIZE 512
static str cache_mod_name = str_init("sql");
struct cachedb_url *sql_script_urls = NULL;
static char query_buf[MAX_RAW_QUERY_SIZE];
static str query_str;
static int mod_init(void);
static int child_init(int rank);
static void destroy(void);
#define KEY_COL "keyname"
#define KEY_COL_LEN (sizeof(KEY_COL) - 1)
#define VALUE_COL "value"
#define VALUE_COL_LEN (sizeof(VALUE_COL) - 1)
#define COUNTER_VALUE_COL "counter"
#define COUNTER_VALUE_COL_LEN (sizeof(COUNTER_VALUE_COL) - 1)
#define EXPIRES_COL "expires"
#define EXPIRES_COL_LEN (sizeof(EXPIRES_COL) - 1)
#define CACHEDB_SQL_TABLE_VERSION 2
static str db_table = str_init("cachedb");
static str key_column = {KEY_COL, KEY_COL_LEN};
static str value_column = {VALUE_COL, VALUE_COL_LEN};
static str counter_column = {COUNTER_VALUE_COL, COUNTER_VALUE_COL_LEN};
static str expires_column = {EXPIRES_COL, EXPIRES_COL_LEN};
static int cache_clean_period = 60;
int set_connection(unsigned int type, void *val)
{
return cachedb_store_url(&sql_script_urls,(char *)val);
}
static param_export_t params[] = {
{"cachedb_url", STR_PARAM|USE_FUNC_PARAM, (void *)&set_connection },
{"db_table", STR_PARAM, &db_table.s },
{"key_column", STR_PARAM, &key_column.s },
{"value_column", STR_PARAM, &value_column.s },
{"counter_column", STR_PARAM, &counter_column.s },
{"expires_column", STR_PARAM, &expires_column.s },
{"cache_clean_period", INT_PARAM, &cache_clean_period },
{0, 0, 0}
};
/** module exports */
struct module_exports exports = {
"cachedb_sql", /* module name */
MOD_TYPE_CACHEDB,/* class of this module */
MODULE_VERSION,
DEFAULT_DLFLAGS, /* dlopen flags */
0, /* load function */
NULL, /* OpenSIPS module dependencies */
0, /* OpenSIPS dependencies function */
0, /* exported functions */
0, /* exported async functions */
params, /* exported parameters */
0, /* exported statistics */
0, /* exported MI functions */
0, /* exported pseudo-variables */
0, /* exported transformations */
0, /* extra processes */
mod_init, /* module initialization function */
(response_function) 0, /* response handling function */
(destroy_function) destroy, /* destroy function */
child_init, /* per-child init function */
0 /* reload confirm function */
};
#define CACHEDBSQL_DB_DELIMITER '-'
cachedbsql_con* dbcache_new_connection(struct cachedb_id* id)
{
cachedbsql_con *con;
str db_url;
char *p,*end;
int group_name_len,scheme_len;
if(id == NULL) {
LM_ERR("null db_id\n");
return 0;
}
if((id->flags & (CACHEDB_ID_NO_URL | CACHEDB_ID_MULTIPLE_HOSTS)) != 0) {
LM_ERR("bogus url for local cachedb\n");
return 0;
}
if (id->group_name == NULL) {
LM_ERR("No sql back-end info provided \n");
return 0;
}
group_name_len = strlen(id->group_name);
scheme_len = strlen(id->scheme);
db_url.s = id->initial_url + scheme_len + 1;
db_url.len = strlen(id->initial_url) - scheme_len - 1;
for (p=id->group_name,end=p+group_name_len;p<end;p++) {
if (*p == CACHEDBSQL_DB_DELIMITER) {
db_url.s += (p-id->group_name) + 1;
db_url.len -= (p-id->group_name) + 1;
break;
}
}
con = pkg_malloc(sizeof(cachedbsql_con));
if(con == NULL) {
LM_ERR("no more pkg\n");
return 0;
}
memset(con,0,sizeof(cachedbsql_con));
con->id = id;
con->ref = 1;
if (db_bind_mod(&db_url, &con->cdb_dbf) < 0){
LM_ERR("unable to bind to a database driver\n");
pkg_free(con);
return 0;
}
con->cdb_db_handle = con->cdb_dbf.init(&db_url);
if (con->cdb_db_handle == 0) {
LM_ERR("Failed to connect to the DB \n");
pkg_free(con);
return 0;
}
if(db_check_table_version(&con->cdb_dbf, con->cdb_db_handle,
&db_table, CACHEDB_SQL_TABLE_VERSION) < 0) {
LM_ERR("error during table version check.\n");
con->cdb_dbf.close(con->cdb_db_handle);
pkg_free(con);
return 0;
}
return con;
}
static cachedb_con* dbcache_init(str *url)
{
return cachedb_do_init(url, (void *)dbcache_new_connection);
}
void dbcache_free_connection(cachedb_pool_con *con)
{
cachedbsql_con *c;
if (!con)
return;
c = (cachedbsql_con*)con;
c->cdb_dbf.close(c->cdb_db_handle);
pkg_free(c);
}
static void dbcache_destroy(cachedb_con *con)
{
cachedb_do_close(con, dbcache_free_connection);
}
#define CACHEDBSQL_CON(c) (((cachedbsql_con*)((c)->data))->cdb_db_handle)
#define CACHEDBSQL_FUNC(c) (((cachedbsql_con*)((c)->data))->cdb_dbf)
static int dbcache_set(cachedb_con *con, str* attr, str* value, int expires)
{
db_key_t keys[3];
db_val_t vals[3];
keys[0] = &key_column;
keys[1] = &value_column;
keys[2] = &expires_column;
vals[0].type = DB_STR;
vals[0].nul = 0;
vals[0].val.str_val.s = attr->s;
vals[0].val.str_val.len = attr->len;
vals[1].type = DB_STR;
vals[1].nul = 0;
vals[1].val.str_val.s = value->s;
vals[1].val.str_val.len = value->len;
vals[2].type = DB_INT;
vals[2].nul = 0;
if (expires > 0)
vals[2].val.int_val = (int)time(NULL) + expires;
else
vals[2].val.int_val = 0;
if (CACHEDBSQL_FUNC(con).use_table(CACHEDBSQL_CON(con), &db_table) < 0) {
LM_ERR("sql use_table failed\n");
return -1;
}
if (CACHEDBSQL_FUNC(con).insert_update(CACHEDBSQL_CON(con), keys, vals, 3) < 0) {
LM_ERR("inserting cache entry in db failed\n");
return -1;
}
return 1;
}
static int dbcache_get(cachedb_con *con, str* attr, str* res)
{
db_key_t key;
db_val_t val;
db_key_t col;
db_res_t* db_res = NULL;
key = &key_column;
val.type = DB_STR;
val.nul = 0;
val.val.str_val.s = attr->s;
val.val.str_val.len = attr->len;
col = &value_column;
if (CACHEDBSQL_FUNC(con).use_table(CACHEDBSQL_CON(con), &db_table) < 0) {
LM_ERR("sql use_table failed\n");
return -1;
}
if(CACHEDBSQL_FUNC(con).query(CACHEDBSQL_CON(con), &key, NULL, &val,
&col, 1, 1, NULL, &db_res) < 0) {
LM_ERR("failed to query database\n");
return -1;
}
if (db_res == NULL || RES_ROW_N(db_res) <= 0 || RES_ROWS(db_res)[0].values[0].nul != 0) {
LM_DBG("no value found for keyI\n");
if (db_res != NULL && CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con),db_res) < 0)
LM_DBG("failed to free result of query\n");
return -2;
}
switch(RES_ROWS(db_res)[0].values[0].type) {
case DB_STRING:
res->len = strlen((char*)RES_ROWS(db_res)[0].values[0].val.string_val);
res->s = pkg_malloc(res->len + 1);
if (res->s == NULL) {
LM_ERR("no more pkg\n");
goto out_err;
}
memcpy(res->s, (char*)RES_ROWS(db_res)[0].values[0].val.string_val, res->len);
break;
case DB_STR:
res->len = RES_ROWS(db_res)[0].values[0].val.str_val.len;
res->s = pkg_malloc(res->len + 1);
if (res->s == NULL) {
LM_ERR("no more pkg\n");
goto out_err;
}
memcpy(res->s, (char*)RES_ROWS(db_res)[0].values[0].val.str_val.s, res->len);
break;
case DB_BLOB:
res->len = RES_ROWS(db_res)[0].values[0].val.blob_val.len;
res->s = pkg_malloc(res->len + 1);
if (res->s == NULL) {
LM_ERR("no more pkg\n");
goto out_err;
}
memcpy(res->s, (char*)RES_ROWS(db_res)[0].values[0].val.blob_val.s, res->len);
break;
default:
LM_ERR("unknown type of DB user column\n");
goto out_err;
}
if (CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), db_res) < 0)
LM_DBG("failed to free result of query\n");
return 1;
out_err:
if (CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), db_res) < 0)
LM_DBG("failed to free result of query\n");
return -1;
}
static int dbcache_remove(cachedb_con *con, str* attr)
{
db_key_t key;
db_val_t val;
key = &key_column;
val.type = DB_STR;
val.nul = 0;
val.val.str_val.s = attr->s;
val.val.str_val.len = attr->len;
if (CACHEDBSQL_FUNC(con).use_table(CACHEDBSQL_CON(con), &db_table) < 0) {
LM_ERR("sql use_table failed\n");
return -1;
}
if (CACHEDBSQL_FUNC(con).delete(CACHEDBSQL_CON(con), &key, 0, &val, 1) < 0) {
LM_ERR("deleting from database failed\n");
return -1;
}
return 0;
}
static int dbcache_add(cachedb_con *con, str *attr, int val, int expires, int *new_val)
{
int i;
db_res_t* res = NULL;
if (expires > 0)
expires += (int)time(NULL);
else
expires = 0;
i = snprintf(query_buf, sizeof(query_buf),
"insert into %.*s (%.*s, %.*s, %.*s) values ('%.*s', %d, %d)"
"on duplicate key update %.*s=%.*s %c %d, %.*s=%d",
db_table.len, db_table.s,
key_column.len, key_column.s,
counter_column.len, counter_column.s,
expires_column.len, expires_column.s,
attr->len, attr->s,
val, expires,
counter_column.len, counter_column.s,
counter_column.len, counter_column.s,
val > 0 ? '+' : '-',
val > 0 ? val : -val,
expires_column.len, expires_column.s,
expires);
if(i >= sizeof(query_buf)) {
LM_ERR("DB query too long\n");
return -1;
}
query_str.s = query_buf;
query_str.len = i;
if(CACHEDBSQL_FUNC(con).raw_query(CACHEDBSQL_CON(con), &query_str, &res) < 0) {
LM_ERR("raw_query failed\n");
return -1;
}
if(res != NULL)
CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), res);
/* Beware of the race conditions! */
if(new_val) {
str val;
if (dbcache_get(con, attr, &val) < 0) {
LM_ERR("could not get the new value\n");
return -1;
}
*new_val = atoi(val.s);
pkg_free(val.s);
}
return 0;
}
static int dbcache_sub(cachedb_con *con, str *attr, int val, int expires, int *new_val)
{
return dbcache_add(con, attr, -val, expires, new_val);
}
static int dbcache_fetch_counter(cachedb_con *con,str *attr,int *ret_val)
{
db_key_t key;
db_val_t val;
db_key_t col;
db_res_t* db_res = NULL;
key = &key_column;
val.type = DB_STR;
val.nul = 0;
val.val.str_val.s = attr->s;
val.val.str_val.len = attr->len;
col = &counter_column;
if (CACHEDBSQL_FUNC(con).use_table(CACHEDBSQL_CON(con), &db_table) < 0) {
LM_ERR("sql use_table failed\n");
return -1;
}
if(CACHEDBSQL_FUNC(con).query(CACHEDBSQL_CON(con), &key, NULL, &val, &col, 1, 1, NULL, &db_res) < 0) {
LM_ERR("failed to query database\n");
return -1;
}
if (db_res == NULL || RES_ROW_N(db_res) <= 0 || RES_ROWS(db_res)[0].values[0].nul != 0) {
LM_DBG("no value found for keyI\n");
if (db_res != NULL && CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), db_res) < 0)
LM_DBG("failed to free result of query\n");
return -2;
}
switch(RES_ROWS(db_res)[0].values[0].type) {
case DB_INT:
if (ret_val)
*ret_val = RES_ROWS(db_res)[0].values[0].val.int_val;
if (CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), db_res) < 0)
LM_ERR("failed to freeing result of query\n");
break;
default:
LM_ERR("unknown type of DB user column\n");
if (db_res != NULL && CACHEDBSQL_FUNC(con).free_result(CACHEDBSQL_CON(con), db_res) < 0)
LM_ERR("failed to freeing result of query\n");
return -1;
}
return 1;
}
static void dbcache_clean(unsigned int ticks, void* param)
{
cachedb_pool_con **lst;
cachedbsql_con *c;
int size=0,i;
db_key_t keys[2];
db_op_t ops[2];
db_val_t vals[2];
keys[0] = &expires_column;
keys[1] = &expires_column;
ops[0] = OP_NEQ;
ops[1] = OP_LT;
vals[0].type = DB_INT;
vals[0].nul = 0;
vals[0].val.int_val = 0;
vals[1].type = DB_INT;
vals[1].nul = 0;
vals[1].val.int_val = (int)time(NULL);
lst = filter_pool_by_scheme(&cache_mod_name,&size);
for (i=0;i<size;i++) {
c = (cachedbsql_con*)(lst[i]);
if (c->cdb_dbf.use_table(c->cdb_db_handle, &db_table) < 0) {
LM_ERR("sql use_table failed\n");
return;
}
if (c->cdb_dbf.delete(c->cdb_db_handle, keys, ops, vals, 2) < 0) {
LM_ERR("deleting from database failed\n");
return;
}
}
if (lst)
pkg_free(lst);
}
/**
* init module function
*/
static int mod_init(void)
{
cachedb_engine cde;
LM_INFO("initializing module cachedb_sql...\n");
memset(&cde, 0, sizeof cde);
db_table.len = strlen(db_table.s);
key_column.len = strlen(key_column.s);
value_column.len = strlen(value_column.s);
counter_column.len = strlen(counter_column.s);
expires_column.len = strlen(expires_column.s);
/* register the cache system */
cde.name = cache_mod_name;
cde.cdb_func.init = dbcache_init;
cde.cdb_func.destroy = dbcache_destroy;
cde.cdb_func.get = dbcache_get;
cde.cdb_func.set = dbcache_set;
cde.cdb_func.remove = dbcache_remove;
cde.cdb_func.add = dbcache_add;
cde.cdb_func.sub = dbcache_sub;
cde.cdb_func.get_counter = dbcache_fetch_counter;
cde.cdb_func.capability = 0;
if(cache_clean_period <= 0) {
LM_ERR("wrong parameter cache_clean_period - need a positive value\n");
return -1;
}
if(register_cachedb(&cde) < 0) {
LM_ERR("failed to register to core memory store interface\n");
return -1;
}
/* register timer to delete the expired entries */
register_timer("cachedb_sql",dbcache_clean, 0, cache_clean_period,
TIMER_FLAG_DELAY_ON_DELAY);
return 0;
}
/**
* Initialize children
*/
static int child_init(int rank)
{
struct cachedb_url *it;
cachedb_con *con;
for (it = sql_script_urls;it;it=it->next) {
LM_DBG("iterating through conns - [%.*s]\n",it->url.len,it->url.s);
con = dbcache_init(&it->url);
if (con == NULL) {
LM_ERR("failed to open connection\n");
return -1;
}
if (cachedb_put_connection(&cache_mod_name,con) < 0) {
LM_ERR("failed to insert connection\n");
return -1;
}
}
cachedb_free_url(sql_script_urls);
return 0;
}
/*
* destroy function
*/
static void destroy(void)
{
cachedb_end_connections(&cache_mod_name);
}