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sql_cacher.c
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sql_cacher.c
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/**
*
* Copyright (C) 2015 OpenSIPS Foundation
*
* 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
* -------
* 2015-09-xx initial version (Vlad Patrascu)
*/
#include "../../sr_module.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "../../ut.h"
#include "../../trim.h"
#include "../../pvar.h"
#include "../../locking.h"
#include "../../rw_locking.h"
#include "../../timer.h"
#include "../../ipc.h"
#include "sql_cacher.h"
static int mod_init(void);
static void destroy(void);
static int child_init(int rank);
int pv_parse_name(pv_spec_p sp, const str *in);
int pv_init_param(pv_spec_p sp, int param);
int pv_get_sql_cached_value(struct sip_msg *msg, pv_param_t *param, pv_value_t *res);
static int parse_cache_entry(unsigned int type, void *val);
static void free_c_entry(cache_entry_t *c);
static mi_response_t *mi_reload_1(const mi_params_t *params,
struct mi_handler *async_hdl);
static mi_response_t *mi_reload_2(const mi_params_t *params,
struct mi_handler *async_hdl);
static str spec_delimiter = str_init(DEFAULT_SPEC_DELIM);
static str pvar_delimiter = str_init(DEFAULT_PVAR_DELIM);
static str columns_delimiter = str_init(DEFAULT_COLUMNS_DELIM);
static int fetch_nr_rows = DEFAULT_FETCH_NR_ROWS;
static int full_caching_expire = DEFAULT_FULL_CACHING_EXPIRE;
static int reload_interval = DEFAULT_RELOAD_INTERVAL;
static cache_entry_t **entry_list;
static struct queried_key **queries_in_progress;
/* per process db handlers corresponding to cache entries in entry_list */
static db_handlers_t *db_hdls_list;
gen_lock_t *queries_lock;
/* module parameters */
static param_export_t mod_params[] = {
{"spec_delimiter", STR_PARAM, &spec_delimiter.s},
{"pvar_delimiter", STR_PARAM, &pvar_delimiter.s},
{"columns_delimiter", STR_PARAM, &columns_delimiter.s},
{"sql_fetch_nr_rows", INT_PARAM, &fetch_nr_rows},
{"full_caching_expire", INT_PARAM, &full_caching_expire},
{"reload_interval", INT_PARAM, &reload_interval},
{"cache_table", STR_PARAM|USE_FUNC_PARAM, (void *)&parse_cache_entry},
{0,0,0}
};
static pv_export_t mod_items[] = {
{{"sql_cached_value", sizeof("sql_cached_value") - 1}, 1000,
pv_get_sql_cached_value, 0, pv_parse_name, 0, 0, 0},
{ {0, 0}, 0, 0, 0, 0, 0, 0, 0 }
};
static mi_export_t mi_cmds[] = {
{ "sql_cacher_reload", "reload the SQL database into the cache", 0, 0, {
{mi_reload_1, {"id", 0}},
{mi_reload_2, {"id", "key", 0}},
{EMPTY_MI_RECIPE}}
},
{EMPTY_MI_EXPORT}
};
static dep_export_t deps = {
{ /* OpenSIPS module dependencies */
{ MOD_TYPE_SQLDB, NULL, DEP_ABORT },
{ MOD_TYPE_CACHEDB, NULL, DEP_ABORT },
{ MOD_TYPE_NULL, NULL, 0 },
},
{ /* modparam dependencies */
{ NULL, NULL },
},
};
/**
* module exports
*/
struct module_exports exports = {
"sql_cacher", /* module name */
MOD_TYPE_DEFAULT, /* class of this module */
MODULE_VERSION,
DEFAULT_DLFLAGS, /* dlopen flags */
0, /* load function */
&deps, /* OpenSIPS module dependencies */
0, /* exported functions */
0, /* exported async functions */
mod_params, /* exported parameters */
0, /* exported statistics */
mi_cmds, /* exported MI functions */
mod_items, /* exported pseudo-variables */
0, /* exported transformations */
0, /* extra processes */
0, /* module pre-initialization function */
mod_init, /* module initialization function */
0, /* response handling function */
destroy, /* destroy function */
child_init, /* per-child init function */
0 /* reload confirm function */
};
static int parse_cache_entry(unsigned int type, void *val)
{
cache_entry_t *new_entry;
char *p1, *p2, *tmp, *c_tmp1, *c_tmp2;
int col_idx;
int rc = -1;
int i;
int len;
str parse_str_copy, parse_str;
if(!entry_list){
entry_list = shm_malloc(sizeof(cache_entry_t*));
if (!entry_list) {
LM_ERR("No more memory for cache entries list\n");
return -1;
}
*entry_list = NULL;
}
parse_str.len = strlen((char *)val);
parse_str.s = pkg_malloc(parse_str.len);
if(!parse_str.s){
LM_ERR("No more pkg memory\n");
return -1;
}
memcpy(parse_str.s, (char *)val, parse_str.len);
new_entry = shm_malloc(sizeof(cache_entry_t));
if (!new_entry) {
LM_ERR("No more memory for cache entry struct\n");
return -1;
}
new_entry->id.s = NULL;
new_entry->columns = NULL;
new_entry->key_type = DB_STR;
new_entry->nr_columns = 0;
new_entry->on_demand = 0;
new_entry->expire = DEFAULT_ON_DEMAND_EXPIRE;
new_entry->nr_ints = 0;
new_entry->nr_strs = 0;
new_entry->column_types = 0;
new_entry->ref_lock = NULL;
#define PARSE_TOKEN(_ptr1, _ptr2, field, field_name_str, field_name_len) \
do { \
(_ptr2) = memchr((_ptr1), '=', parse_str.len - \
((_ptr1) - parse_str.s)); \
if (!(_ptr2)) { \
LM_ERR("expected: '=' after %.*s\n", (field_name_len), (field_name_str)); \
goto parse_err; \
} \
if (!memcmp((_ptr1), (field_name_str), (field_name_len))) { \
if (*((_ptr1)+(field_name_len)) != '=') { \
LM_ERR("expected: '=' after %.*s\n", (field_name_len), (field_name_str)); \
goto parse_err; \
} \
tmp = memchr((_ptr2) + 1, spec_delimiter.s[0], parse_str.len - \
((_ptr2) - parse_str.s)); \
if (!tmp) { \
LM_ERR("expected: %c after value of %.*s\n", spec_delimiter.s[0], \
(field_name_len), (field_name_str)); \
goto parse_err; \
} \
new_entry->field.len = tmp - (_ptr2) - 1; \
if (new_entry->field.len <= 0) { \
LM_ERR("expected value of: %.*s\n", (field_name_len), (field_name_str)); \
goto parse_err; \
} \
new_entry->field.s = shm_malloc(new_entry->field.len); \
memcpy(new_entry->field.s, p2 + 1, new_entry->field.len); \
} else { \
LM_ERR("expected: %.*s instead of: %.*s\n", (field_name_len), (field_name_str), \
(field_name_len), (_ptr1)); \
goto parse_err; \
} \
} while (0)
parse_str_copy = parse_str;
trim(&parse_str);
/* parse the id */
p1 = parse_str.s;
PARSE_TOKEN(p1, p2, id, ID_STR, ID_STR_LEN);
/* parse the db_url */
p1 = tmp + 1;
PARSE_TOKEN(p1, p2, db_url, DB_URL_STR, DB_URL_LEN);
/* parse the cachedb_url */
p1 = tmp + 1;
PARSE_TOKEN(p1, p2, cachedb_url, CACHEDB_URL_STR, CACHEDB_URL_LEN);
/* parse the table name */
p1 = tmp + 1;
PARSE_TOKEN(p1, p2, table, TABLE_STR, TABLE_STR_LEN);
#undef PARSE_TOKEN
/* parse the key column name */
p1 = tmp + 1;
p2 = memchr(p1, '=', parse_str.len - (p1 - parse_str.s));
if (!p2) {
LM_ERR("expected: '=' after %.*s\n", KEY_STR_LEN, KEY_STR);
goto parse_err;
}
if (!memcmp(p1, KEY_STR, KEY_STR_LEN)) {
if (*(p1+KEY_STR_LEN) != '=') { \
LM_ERR("expected: '=' after %.*s\n", KEY_STR_LEN, KEY_STR);
goto parse_err;
}
tmp = memchr(p2 + 1, spec_delimiter.s[0],
parse_str.len - (p2 - parse_str.s));
if (!tmp) /* delimiter not found, reached the end of the string to parse */
new_entry->key.len = parse_str.len - (p2 - parse_str.s + 1);
else
new_entry->key.len = tmp - p2 - 1;
if (new_entry->key.len <= 0) {
LM_ERR("expected value of: %.*s\n", KEY_STR_LEN, KEY_STR);
goto parse_err;
}
new_entry->key.s = shm_malloc(new_entry->key.len);
memcpy(new_entry->key.s, p2 + 1, new_entry->key.len);
if (!tmp)
goto end_parsing;
} else {
LM_ERR("expected: %.*s instead of: %.*s\n", (KEY_STR_LEN), (KEY_STR), \
KEY_STR_LEN, p1);
goto parse_err;
}
/* parse the key type if present */
p1 = tmp + 1;
p2 = memchr(p1, '=', parse_str.len - (p1 - parse_str.s));
if (!p2) {
LM_ERR("expected: '='\n");
goto parse_err;
}
if (!memcmp(p1, KEY_TYPE_STR, KEY_TYPE_STR_LEN)) {
if (*(p1+KEY_TYPE_STR_LEN) != '=') { \
LM_ERR("expected: '=' after: %.*s\n", KEY_TYPE_STR_LEN, KEY_TYPE_STR);
goto parse_err;
}
tmp = memchr(p2 + 1, spec_delimiter.s[0],
parse_str.len - (p2 - parse_str.s));
if (!tmp)
len = parse_str.len - (p2 - parse_str.s + 1);
else
len = tmp - p2 - 1;
if (len <= 0) {
LM_ERR("expected value of: %.*s\n", KEY_TYPE_STR_LEN, KEY_TYPE_STR);
goto parse_err;
}
if (len == TYPE_STR_LEN && !memcmp(p2+1, TYPE_STR_STR, len))
new_entry->key_type = DB_STR;
else if (len == TYPE_INT_LEN && !memcmp(p2+1, TYPE_INT_STR, len))
new_entry->key_type = DB_INT;
else {
LM_ERR("Unsupported key type: %.*s\n", len, p2+1);
goto parse_err;
}
if (!tmp) /* delimiter not found, reached the end of the string to parse */
goto end_parsing;
else {
p1 = tmp + 1;
p2 = memchr(p1, '=', parse_str.len - (p1 - parse_str.s));
if (!p2) {
LM_ERR("expected: '='\n");
goto parse_err;
}
}
}
/* parse the required column names if present */
if (!memcmp(p1, COLUMNS_STR, COLUMNS_STR_LEN)) {
if (*(p1+COLUMNS_STR_LEN) != '=') { \
LM_ERR("expected: '=' after: %.*s\n", COLUMNS_STR_LEN, COLUMNS_STR);
goto parse_err;
}
col_idx = 0;
tmp = memchr(p2 + 1, spec_delimiter.s[0],
parse_str.len - (p2 - parse_str.s + 1));
/* just count how many columns there are */
new_entry->nr_columns = 1;
c_tmp1 = memchr(p2 + 1, columns_delimiter.s[0],
parse_str.len - (p2 - parse_str.s + 1));
while (c_tmp1) {
new_entry->nr_columns++;
c_tmp1 = memchr(c_tmp1 + 1, columns_delimiter.s[0],
parse_str.len - (c_tmp1 - parse_str.s + 1));
}
if (new_entry->nr_columns > sizeof(long long) * 8) {
LM_WARN("Too many columns, maximum number is %zu\n", sizeof(long long) * 8);
goto parse_err;
}
/* allocate array of columns and actually parse */
new_entry->columns = shm_malloc(new_entry->nr_columns * sizeof(str*));
c_tmp1 = p2 + 1;
c_tmp2 = memchr(p2 + 1, columns_delimiter.s[0],
parse_str.len - (p2 - parse_str.s + 1));
while (c_tmp2) {
new_entry->columns[col_idx] = shm_malloc(sizeof(str));
(*new_entry->columns[col_idx]).len = c_tmp2 - c_tmp1;
if ((*new_entry->columns[col_idx]).len <= 0) {
LM_ERR("expected name of column\n");
goto parse_err;
}
(*new_entry->columns[col_idx]).s = shm_malloc((*new_entry->columns[col_idx]).len);
memcpy((*new_entry->columns[col_idx]).s, c_tmp1, (*new_entry->columns[col_idx]).len);
c_tmp1 = c_tmp2 + 1;
c_tmp2 = memchr(c_tmp1, columns_delimiter.s[0],
parse_str.len - (c_tmp1 - parse_str.s + 1));
col_idx++;
}
new_entry->columns[col_idx] = shm_malloc(sizeof(str));
if (!tmp)
(*new_entry->columns[col_idx]).len = parse_str.len - (c_tmp1 - parse_str.s);
else
(*new_entry->columns[col_idx]).len = tmp - c_tmp1;
if ((*new_entry->columns[col_idx]).len <= 0) {
LM_ERR("expected name of column\n");
goto parse_err;
}
(*new_entry->columns[col_idx]).s = shm_malloc((*new_entry->columns[col_idx]).len);
memcpy((*new_entry->columns[col_idx]).s, c_tmp1, (*new_entry->columns[col_idx]).len);
if (!tmp) /* delimiter not found, reached the end of the string to parse */
goto end_parsing;
else {
p1 = tmp + 1;
p2 = memchr(p1, '=', parse_str.len - (p1 - parse_str.s));
if (!p2) {
LM_ERR("expected: '='\n");
goto parse_err;
}
}
}
/* parse on demand parameter */
if (!memcmp(p1, ONDEMAND_STR, ONDEMAND_STR_LEN)) {
if (*(p1+ONDEMAND_STR_LEN) != '=') { \
LM_ERR("expected: '=' after: %.*s\n", ONDEMAND_STR_LEN, ONDEMAND_STR);
goto parse_err;
}
tmp = memchr(p2 + 1, spec_delimiter.s[0],
parse_str.len - (p2 - parse_str.s));
str str_val;
if (!tmp) /* delimiter not found, reached the end of the string to parse */
str_val.len = parse_str.len - (p2 - parse_str.s + 1);
else
str_val.len = tmp - p2 - 1;
if (str_val.len <= 0) {
LM_ERR("expected value of: %.*s\n", ONDEMAND_STR_LEN, ONDEMAND_STR);
goto parse_err;
}
str_val.s = p2 + 1;
if(str2int(&str_val, &new_entry->on_demand)) {
LM_ERR("expected integer value for: %.*s instead of: %.*s\n",
ONDEMAND_STR_LEN, ONDEMAND_STR, str_val.len, str_val.s);
goto parse_err;
}
if (!tmp) /* delimiter not found, reached the end of the string to parse */
goto end_parsing;
else {
p1 = tmp + 1;
p2 = memchr(p1, '=', parse_str.len - (p1 - parse_str.s));
if (!p2) {
LM_ERR("expected: '='\n");
goto parse_err;
}
}
}
/* parse expire parameter */
if (!memcmp(p1, EXPIRE_STR, EXPIRE_STR_LEN)) {
str str_val;
str_val.len = parse_str.len - (p2 - parse_str.s + 1);
if (str_val.len <= 0) {
LM_ERR("expected value of: %.*s\n", EXPIRE_STR_LEN, EXPIRE_STR);
goto parse_err;
}
str_val.s = p2 + 1;
if(str2int(&str_val, &new_entry->expire)) {
LM_ERR("expected integer value for: %.*s instead of: %.*s\n",
EXPIRE_STR_LEN, EXPIRE_STR, str_val.len, str_val.s);
goto parse_err;
}
} else {
LM_ERR("unknown parameter: %.*s\n",
(int)(parse_str.len - (p1 - parse_str.s)), p1);
goto parse_err;
}
end_parsing:
new_entry->next = NULL;
if (*entry_list)
new_entry->next = *entry_list;
*entry_list = new_entry;
pkg_free(parse_str_copy.s);
return 0;
parse_err:
if (!new_entry->id.s)
LM_WARN("invalid cache entry specification: %.*s\n",
parse_str.len, parse_str.s);
else
LM_WARN("invalid cache entry specification for id: %.*s\n",
new_entry->id.len, new_entry->id.s);
if (new_entry->columns) {
for (i=0; i < new_entry->nr_columns; i++)
if (new_entry->columns[i]) {
if ((*new_entry->columns[i]).s)
shm_free((*new_entry->columns[i]).s);
shm_free(new_entry->columns[i]);
}
shm_free(new_entry->columns);
}
shm_free(new_entry);
pkg_free(parse_str_copy.s);
return rc;
}
/* get the column types from the sql query result */
static int get_column_types(cache_entry_t *c_entry, db_val_t *values, int nr_columns)
{
unsigned int i;
db_type_t val_type;
c_entry->nr_ints = 0;
c_entry->nr_strs = 0;
c_entry->column_types = 0;
for (i = 0; i < nr_columns; i++) {
val_type = VAL_TYPE(values + i);
switch (val_type) {
case DB_INT:
case DB_BIGINT:
case DB_DOUBLE:
c_entry->nr_ints++;
c_entry->column_types &= ~(1LL << i);
break;
case DB_STRING:
case DB_STR:
case DB_BLOB:
c_entry->nr_strs++;
c_entry->column_types |= (1LL << i);
break;
default:
LM_ERR("Unsupported type: %d for column: %.*s\n", val_type,
c_entry->columns[i]->len, c_entry->columns[i]->s);
return -1;
}
}
return 0;
}
/* returns the total size of the actual value which will be stored in the cachedb*/
static unsigned int get_cdb_val_size(cache_entry_t *c_entry, db_val_t *values, int nr_columns)
{
unsigned int i, len = 0;
db_type_t val_type;
/* reload version + integer values + offsets of the string values */
len = INT_B64_ENC_LEN + c_entry->nr_ints*INT_B64_ENC_LEN + c_entry->nr_strs*INT_B64_ENC_LEN;
/* length of the actual string values*/
for (i = 0; i < nr_columns; i++) {
val_type = VAL_TYPE(values + i);
switch (val_type) {
case DB_STRING:
len += strlen(VAL_STRING(values + i));
break;
case DB_STR:
len += VAL_STR(values + i).len;
break;
case DB_BLOB:
len += VAL_BLOB(values + i).len;
break;
default: continue;
}
}
return len;
}
static int insert_in_cachedb(cache_entry_t *c_entry, db_handlers_t *db_hdls,
db_val_t *key, db_val_t *values, int reload_version, int nr_columns)
{
unsigned int i, offset = 0, strs_offset = 0;
int int_val;
int int_key_len = 0, rc = 0;
char int_enc_buf[INT_B64_ENC_LEN];
char *int_key_buf = NULL;
str str_val;
db_type_t val_type;
str str_key = STR_NULL;
str cdb_val;
str cdb_key = STR_NULL;
cdb_val.len = get_cdb_val_size(c_entry, values, nr_columns);
cdb_val.s = pkg_malloc(cdb_val.len);
if (!cdb_val.s) {
LM_ERR("No more pkg memory\n");
return -1;
}
/* store the reload version (base64 encoded) */
base64encode((unsigned char *)int_enc_buf, (unsigned char *)&reload_version, 4);
memcpy(cdb_val.s, int_enc_buf, INT_B64_ENC_LEN);
offset += INT_B64_ENC_LEN;
/* store the integer values (base64 encoded) */
for (i = 0; i < nr_columns; i++) {
int_val = 0;
val_type = VAL_TYPE(values + i);
switch (val_type) {
case DB_INT:
int_val = VAL_INT(values + i);
break;
case DB_BIGINT:
int_val = (int)VAL_BIGINT(values + i);
break;
case DB_DOUBLE:
int_val = (int)VAL_DOUBLE(values + i);
break;
default: continue;
}
if (VAL_NULL(values + i))
memset(int_enc_buf, 0, INT_B64_ENC_LEN);
else
base64encode((unsigned char *)int_enc_buf, (unsigned char *)&int_val, 4);
memcpy(cdb_val.s + offset, int_enc_buf, INT_B64_ENC_LEN);
offset += INT_B64_ENC_LEN;
}
/* store the string values and their offsets as integers (base64 encoded) */
strs_offset = offset + c_entry->nr_strs * INT_B64_ENC_LEN;
for (i = 0; i < nr_columns; i++) {
val_type = VAL_TYPE(values + i);
switch (val_type) {
case DB_STRING:
str_val.s = (char *)VAL_STRING(values + i);
str_val.len = strlen(str_val.s);
break;
case DB_STR:
str_val = VAL_STR(values + i);
break;
case DB_BLOB:
str_val = VAL_BLOB(values + i);
break;
default: continue;
}
if (VAL_NULL(values + i))
int_val = 0;
else
int_val = strs_offset;
base64encode((unsigned char *)int_enc_buf, (unsigned char *)&int_val, 4);
memcpy(cdb_val.s + offset, int_enc_buf, INT_B64_ENC_LEN);
offset += INT_B64_ENC_LEN;
memcpy(cdb_val.s + strs_offset, str_val.s, str_val.len);
strs_offset += str_val.len;
}
/* make sure the key is string */
val_type = VAL_TYPE(key);
switch (val_type) {
case DB_STRING:
str_key.s = (char *)VAL_STRING(key);
str_key.len = strlen(str_key.s);
break;
case DB_STR:
str_key = VAL_STR(key);
break;
case DB_BLOB:
str_key = VAL_BLOB(key);
break;
case DB_INT:
int_key_buf = sint2str(VAL_INT(key), &int_key_len);
break;
case DB_BIGINT:
int_val = (int)VAL_BIGINT(key);
int_key_buf = sint2str(int_val, &int_key_len);
break;
case DB_DOUBLE:
int_val = (int)VAL_DOUBLE(key);
int_key_buf = sint2str(int_val, &int_key_len);
break;
default:
LM_ERR("Unsupported type for SQL DB key column\n");
rc = -1;
goto out;
}
if (int_key_len) {
str_key.s = int_key_buf;
str_key.len = int_key_len;
}
cdb_key.len = c_entry->id.len + str_key.len;
cdb_key.s = pkg_malloc(cdb_key.len);
if (!cdb_key.s) {
LM_ERR("No more pkg memory\n");
rc = -1;
goto out;
}
memcpy(cdb_key.s, c_entry->id.s, c_entry->id.len);
memcpy(cdb_key.s + c_entry->id.len, str_key.s, str_key.len);
if (db_hdls->cdbf.set(db_hdls->cdbcon, &cdb_key, &cdb_val, c_entry->expire) < 0) {
LM_ERR("Failed to insert the values for key: %.*s in cachedb\n",
str_key.len, str_key.s);
rc = -1;
}
out:
pkg_free(cdb_key.s);
pkg_free(cdb_val.s);
return rc;
}
static db_handlers_t *db_init_test_conn(cache_entry_t *c_entry)
{
db_handlers_t *new_db_hdls;
str test_query_key_str = str_init(TEST_QUERY_STR);
str cdb_test_key = str_init(CDB_TEST_KEY_STR);
str cdb_test_val = str_init(CDB_TEST_VAL_STR);
db_key_t query_key_col;
db_val_t query_key_val;
db_res_t *sql_res;
str cachedb_res;
unsigned int i;
int rc;
new_db_hdls = pkg_malloc(sizeof(db_handlers_t));
if (!new_db_hdls) {
LM_ERR("No more pkg memory for db handlers\n");
return NULL;
}
new_db_hdls->c_entry = c_entry;
new_db_hdls->db_con = 0;
new_db_hdls->query_ps = NULL;
new_db_hdls->cdbcon = 0;
/* cachedb init and test connection */
if (cachedb_bind_mod(&c_entry->cachedb_url, &new_db_hdls->cdbf) < 0) {
LM_ERR("Unable to bind to a cachedb database driver for URL: %s\n",
db_url_escape(&c_entry->cachedb_url));
return NULL;
}
/* open a test connection */
new_db_hdls->cdbcon = new_db_hdls->cdbf.init(&c_entry->cachedb_url);
if (!new_db_hdls->cdbcon) {
LM_ERR("Cannot init connection to cachedb: %s\n",
db_url_escape(&c_entry->cachedb_url));
return NULL;
}
/* setting and getting a test key in cachedb */
if (new_db_hdls->cdbf.set(new_db_hdls->cdbcon, &cdb_test_key, &cdb_test_val,
0) < 0) {
LM_ERR("Failed to set test key in cachedb: %s\n",
db_url_escape(&c_entry->cachedb_url));
new_db_hdls->cdbf.destroy(new_db_hdls->cdbcon);
new_db_hdls->cdbcon = 0;
return NULL;
}
if (new_db_hdls->cdbf.get(new_db_hdls->cdbcon, &cdb_test_key, &cachedb_res) < 0) {
LM_ERR("Failed to get test key from cachedb: %s\n",
db_url_escape(&c_entry->cachedb_url));
new_db_hdls->cdbf.destroy(new_db_hdls->cdbcon);
new_db_hdls->cdbcon = 0;
return NULL;
}
rc = str_strcmp(&cachedb_res, &cdb_test_val);
pkg_free(cachedb_res.s);
if (rc != 0) {
LM_ERR("Inconsistent test key for cachedb: %s\n",
db_url_escape(&c_entry->cachedb_url));
new_db_hdls->cdbf.destroy(new_db_hdls->cdbcon);
new_db_hdls->cdbcon = 0;
return NULL;
}
/* SQL DB init and test connection */
if (db_bind_mod(&c_entry->db_url, &new_db_hdls->db_funcs) < 0) {
LM_ERR("Unable to bind to a SQL database driver for URL: %s\n",
db_url_escape(&c_entry->db_url));
return NULL;
}
/* open a test connection */
if ((new_db_hdls->db_con = new_db_hdls->db_funcs.init(&c_entry->db_url)) == 0) {
LM_ERR("Cannot init connection to SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
return NULL;
}
/* verify the column names by running a test query with a bogus key */
if (new_db_hdls->db_funcs.use_table(new_db_hdls->db_con, &c_entry->table) < 0) {
LM_ERR("Invalid table name: %.*s\n", c_entry->table.len, c_entry->table.s);
new_db_hdls->db_funcs.close(new_db_hdls->db_con);
new_db_hdls->db_con = 0;
return NULL;
}
VAL_NULL(&query_key_val) = 0;
VAL_TYPE(&query_key_val) = c_entry->key_type;
if (c_entry->key_type == DB_STR)
VAL_STR(&query_key_val) = test_query_key_str;
else
VAL_INT(&query_key_val) = TEST_QUERY_INT;
query_key_col = &c_entry->key;
if (new_db_hdls->db_funcs.query(new_db_hdls->db_con, &query_key_col, 0,
&query_key_val, c_entry->columns, 1, c_entry->nr_columns, 0, &sql_res) != 0) {
LM_ERR("Failure to issuse test query to SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
new_db_hdls->db_funcs.close(new_db_hdls->db_con);
new_db_hdls->db_con = 0;
return NULL;
}
/* no columns specified in cache entry -> cache entire table and get column
* names from the sql result */
if (!c_entry->columns) {
c_entry->nr_columns = RES_COL_N(sql_res);
c_entry->columns = shm_malloc(c_entry->nr_columns * sizeof(str*));
for (i = 0; i < c_entry->nr_columns; i++) {
c_entry->columns[i] = shm_malloc(sizeof(str));
(*c_entry->columns[i]).len = RES_NAMES(sql_res)[i]->len;
(*c_entry->columns[i]).s = shm_malloc((*c_entry->columns[i]).len);
memcpy((*c_entry->columns[i]).s, RES_NAMES(sql_res)[i]->s,
(*c_entry->columns[i]).len);
}
}
new_db_hdls->db_funcs.free_result(new_db_hdls->db_con, sql_res);
return new_db_hdls;
}
static int inc_cache_rld_vers(db_handlers_t *db_hdls, int *rld_vers)
{
str rld_vers_key;
rld_vers_key.len = db_hdls->c_entry->id.len + 23;
rld_vers_key.s = pkg_malloc(rld_vers_key.len);
if (!rld_vers_key.s) {
LM_ERR("No more pkg memory\n");
return -1;
}
memcpy(rld_vers_key.s, db_hdls->c_entry->id.s, db_hdls->c_entry->id.len);
memcpy(rld_vers_key.s + db_hdls->c_entry->id.len, "_sql_cacher_reload_vers", 23);
if (db_hdls->cdbf.add(db_hdls->cdbcon, &rld_vers_key, 1, 0, rld_vers) < 0) {
LM_DBG("Failed to increment reload version integer from cachedb\n");
pkg_free(rld_vers_key.s);
return -1;
}
pkg_free(rld_vers_key.s);
return 0;
}
static int load_entire_table(cache_entry_t *c_entry, db_handlers_t *db_hdls,
int inc_rld_vers)
{
db_key_t *query_cols = NULL;
db_res_t *sql_res = NULL;
db_row_t *row;
db_val_t *values;
int i;
int reload_vers = 0;
query_cols = pkg_malloc((c_entry->nr_columns + 1) * sizeof(db_key_t));
if (!query_cols) {
LM_ERR("No more pkg memory\n");
return -1;
}
query_cols[0] = &(c_entry->key);
for (i=0; i < c_entry->nr_columns; i++)
query_cols[i+1] = &((*c_entry->columns[i]));
/* query the entire table */
if (db_hdls->db_funcs.use_table(db_hdls->db_con, &c_entry->table) < 0) {
LM_ERR("Invalid table name: %.*s\n", c_entry->table.len, c_entry->table.s);
db_hdls->db_funcs.close(db_hdls->db_con);
db_hdls->db_con = 0;
pkg_free(query_cols);
return -1;
}
if (DB_CAPABILITY(db_hdls->db_funcs, DB_CAP_FETCH)) {
if (db_hdls->db_funcs.query(db_hdls->db_con, NULL, 0, NULL,
query_cols, 0, c_entry->nr_columns + 1, 0, 0) != 0) {
LM_ERR("Failure to issue query to SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
pkg_free(query_cols);
goto error;
}
if (db_hdls->db_funcs.fetch_result(db_hdls->db_con,&sql_res,fetch_nr_rows)<0) {
LM_ERR("Error fetching rows from SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
pkg_free(query_cols);
goto error;
}
} else {
if (db_hdls->db_funcs.query(db_hdls->db_con, NULL, 0, NULL,
query_cols, 0, c_entry->nr_columns + 1, 0, &sql_res) != 0) {
LM_ERR("Failure to issue query to SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
pkg_free(query_cols);
goto error;
}
}
pkg_free(query_cols);
lock_start_write(db_hdls->c_entry->ref_lock);
if (inc_rld_vers && inc_cache_rld_vers(db_hdls, &reload_vers) < 0) {
lock_stop_write(db_hdls->c_entry->ref_lock);
goto error;
}
/* anything loaded ? if not, we can do a quick exit here */
if (RES_ROW_N(sql_res) == 0) {
lock_stop_write(db_hdls->c_entry->ref_lock);
db_hdls->db_funcs.free_result(db_hdls->db_con, sql_res);
return 0;
}
row = RES_ROWS(sql_res);
values = ROW_VALUES(row);
if (get_column_types(c_entry, values + 1, ROW_N(row) - 1) < 0) {
lock_stop_write(db_hdls->c_entry->ref_lock);
goto error;
}
/* load the rows into the cahchedb */
do {
for (i=0; i < RES_ROW_N(sql_res); i++) {
row = RES_ROWS(sql_res) + i;
values = ROW_VALUES(row);
if (!VAL_NULL(values))
if (insert_in_cachedb(c_entry, db_hdls, values ,values + 1,
reload_vers, ROW_N(row) - 1) < 0) {
lock_stop_write(db_hdls->c_entry->ref_lock);
return -1;
}
}
if (DB_CAPABILITY(db_hdls->db_funcs, DB_CAP_FETCH)) {
if (db_hdls->db_funcs.fetch_result(db_hdls->db_con,&sql_res,fetch_nr_rows)<0) {
LM_ERR("Error fetching rows (1) from SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
lock_stop_write(db_hdls->c_entry->ref_lock);
goto error;
}
} else {
break;
}
} while (RES_ROW_N(sql_res) > 0);
lock_stop_write(db_hdls->c_entry->ref_lock);
db_hdls->db_funcs.free_result(db_hdls->db_con, sql_res);
return 0;
error:
if (sql_res)
db_hdls->db_funcs.free_result(db_hdls->db_con, sql_res);
return -1;
}
/* return:
* 0 - succes
* -1 - error
* -2 - not found in sql db
*/
static int load_key(cache_entry_t *c_entry, db_handlers_t *db_hdls, str key,
db_val_t **values, db_res_t **sql_res, int rld_vers)
{
db_key_t key_col;
db_row_t *row;
db_val_t key_val;
str src_key, null_val;
src_key.len = c_entry->id.len + key.len;
src_key.s = pkg_malloc(src_key.len);
if (!src_key.s) {
LM_ERR("No more shm memory\n");
return -1;
}
memcpy(src_key.s, c_entry->id.s, c_entry->id.len);
memcpy(src_key.s + c_entry->id.len, key.s, key.len);
key_col = &(c_entry->key);
VAL_NULL(&key_val) = 0;
VAL_TYPE(&key_val) = c_entry->key_type;
if (c_entry->key_type == DB_STR)
VAL_STR(&key_val) = key;
else if (str2sint(&key, &VAL_INT(&key_val)) < 0) {
LM_ERR("Failed to convert key value to integer\n");
goto out_error;
}
if (db_hdls->db_funcs.use_table(db_hdls->db_con, &c_entry->table) < 0) {
LM_ERR("Invalid table name: %.*s\n", c_entry->table.len, c_entry->table.s);
db_hdls->db_funcs.close(db_hdls->db_con);
db_hdls->db_con = 0;
goto out_error;
}
CON_PS_REFERENCE(db_hdls->db_con) = &db_hdls->query_ps;
if (db_hdls->db_funcs.query(db_hdls->db_con,
&key_col, 0, &key_val, c_entry->columns, 1,
c_entry->nr_columns, 0, sql_res) != 0) {
LM_ERR("Failure to issue query to SQL DB: %s\n",
db_url_escape(&c_entry->db_url));
goto sql_error;
}
if (RES_ROW_N(*sql_res) == 0) {
LM_DBG("key %.*s not found in SQL db\n", key.len, key.s);
null_val.len = 0;
null_val.s = NULL;
if (db_hdls->cdbf.set(db_hdls->cdbcon, &src_key, &null_val, c_entry->expire) < 0) {
LM_ERR("Failed to insert null in cachedb\n");
goto sql_error;
}
pkg_free(src_key.s);
db_hdls->db_funcs.free_result(db_hdls->db_con, *sql_res);
return -2;
} else if (RES_ROW_N(*sql_res) > 1) {
LM_ERR("SQL query returned multiple rows\n");
goto sql_error;
}
row = RES_ROWS(*sql_res);
*values = ROW_VALUES(row);
if (c_entry->nr_ints + c_entry->nr_strs == 0 &&
get_column_types(c_entry, *values, ROW_N(row)) < 0)
goto sql_error;
if (insert_in_cachedb(c_entry, db_hdls, &key_val, *values, rld_vers, ROW_N(row)) < 0)
goto sql_error;