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Merge pull request #5247 from sysown/v3.0-issue5246
Fix: Automatic prefix stripping for mysql_variables, pgsql_variables, and admin_variables config parsing
2 parents 87026c0 + 0b2bc1b commit 8cf3e59

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‎include/proxysql_config.h‎

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -15,12 +15,25 @@ enum proxysql_config_type {
1515
PROXYSQL_CONFIG_PROXY_SERVERS,
1616
};
1717

18+
/**
19+
* @brief Configuration management class for ProxySQL.
20+
*
21+
* Handles reading and writing configuration from/to SQLite database and config files.
22+
* This class provides methods to load configuration sections (variables, users, servers,
23+
* query rules, scheduler, restapi) from config files into the database and vice versa.
24+
*
25+
* The class supports automatic prefix stripping for configuration variables to handle
26+
* cases where users mistakenly include the module prefix (e.g., "mysql-") in variable names.
27+
*/
1828
class ProxySQL_Config {
1929
public:
2030
SQLite3DB* admindb;
31+
/** @brief Constructs ProxySQL_Config with a database handle */
2132
ProxySQL_Config(SQLite3DB* db);
33+
/** @brief Virtual destructor */
2234
virtual ~ProxySQL_Config();
2335

36+
/** @copydoc ProxySQL_Config::Read_Global_Variables_from_configfile */
2437
int Read_Global_Variables_from_configfile(const char *prefix);
2538
int Read_MySQL_Users_from_configfile(std::string& error);
2639
int Read_MySQL_Query_Rules_from_configfile();

‎lib/ProxySQL_Config.cpp‎

Lines changed: 56 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2,10 +2,14 @@
22
#include "re2/re2.h"
33
#include "proxysql.h"
44
#include "cpp.h"
5+
#include "sqlite3db.h"
6+
#include "proxysql_debug.h"
57

68
#include <sstream>
79
#include <set>
810
#include <tuple>
11+
#include <cstring>
12+
#include <memory>
913

1014
const char* config_header = "########################################################################################\n"
1115
"# This config file is parsed using libconfig , and its grammar is described in:\n"
@@ -59,6 +63,33 @@ void ProxySQL_Config::addField(std::string& data, const char* name, const char*
5963
data += ss.str();
6064
}
6165

66+
/**
67+
* @brief Reads global variables from configuration file for a given module prefix.
68+
*
69+
* This function parses the configuration file section named `<prefix>_variables`
70+
* (e.g., "mysql_variables", "pgsql_variables", "admin_variables") and inserts
71+
* the variables into the global_variables table in the format "prefix-variable_name".
72+
*
73+
* The function automatically strips duplicate module prefixes from variable names.
74+
* For example, if a user writes "mysql-log_unhealthy_connections" in the mysql_variables
75+
* section, the prefix "mysql-" is automatically removed, and the variable is stored
76+
* as "mysql-log_unhealthy_connections" (with a single prefix).
77+
*
78+
* @param prefix The module prefix: "mysql", "pgsql", or "admin".
79+
* @return Number of variables processed (successfully read and stored).
80+
* @retval 0 if the prefix_variables section does not exist in the config file.
81+
*
82+
* @note The function temporarily disables foreign keys for performance.
83+
* @note Variable values are converted to strings: booleans become "true"/"false",
84+
* integers are converted via std::to_string, and strings are used as-is.
85+
*
86+
* @par Example:
87+
* For prefix="mysql", the function reads the "mysql_variables" section from config.
88+
* If the config contains "mysql-log_unhealthy_connections=false", it's stored as
89+
* "mysql-log_unhealthy_connections" with value "false".
90+
*
91+
* @see ProxySQL_Config::Write_Global_Variables_to_configfile()
92+
*/
6293
int ProxySQL_Config::Read_Global_Variables_from_configfile(const char *prefix) {
6394
const Setting& root = GloVars.confFile->cfg.getRoot();
6495
char *groupname=(char *)malloc(strlen(prefix)+strlen((char *)"_variables")+1);
@@ -71,8 +102,16 @@ int ProxySQL_Config::Read_Global_Variables_from_configfile(const char *prefix) {
71102
int count = group.getLength();
72103
//fprintf(stderr, "Found %d %s_variables\n",count, prefix);
73104
int i;
105+
size_t prefix_len = strlen(prefix);
74106
admindb->execute("PRAGMA foreign_keys = OFF");
75-
char *q=(char *)"INSERT OR REPLACE INTO global_variables VALUES (\"%s-%s\", \"%s\")";
107+
// Prepare statement once for all inserts
108+
auto [rc, stmt] = admindb->prepare_v2("INSERT OR REPLACE INTO global_variables VALUES (?1, ?2)");
109+
if (rc != SQLITE_OK) {
110+
proxy_error("Failed to prepare statement for global_variables insert: %d\n", rc);
111+
admindb->execute("PRAGMA foreign_keys = ON");
112+
free(groupname);
113+
return 0;
114+
}
76115
for (i=0; i< count; i++) {
77116
const Setting &sett = group[i];
78117
const char *n=sett.getName();
@@ -89,12 +128,23 @@ int ProxySQL_Config::Read_Global_Variables_from_configfile(const char *prefix) {
89128
}
90129
}
91130
//fprintf(stderr,"%s = %s\n", n, value_string.c_str());
92-
char *query=(char *)malloc(strlen(q)+strlen(prefix)+strlen(n)+strlen(value_string.c_str()));
93-
sprintf(query,q, prefix, n, value_string.c_str());
94-
//fprintf(stderr, "%s\n", query);
95-
admindb->execute(query);
96-
free(query);
131+
// Automatic prefix stripping: if variable already starts with "prefix-", remove it
132+
if (strncmp(n, prefix, prefix_len) == 0 && n[prefix_len] == '-') {
133+
n += prefix_len + 1; // Skip "prefix-"
134+
}
135+
// Construct full variable name
136+
std::string full_var_name = std::string(prefix) + "-" + n;
137+
rc = (*proxy_sqlite3_bind_text)(stmt.get(), 1, full_var_name.c_str(), -1, SQLITE_TRANSIENT);
138+
ASSERT_SQLITE_OK(rc, admindb);
139+
rc = (*proxy_sqlite3_bind_text)(stmt.get(), 2, value_string.c_str(), -1, SQLITE_TRANSIENT);
140+
ASSERT_SQLITE_OK(rc, admindb);
141+
SAFE_SQLITE3_STEP2(stmt.get());
142+
rc = (*proxy_sqlite3_clear_bindings)(stmt.get());
143+
ASSERT_SQLITE_OK(rc, admindb);
144+
rc = (*proxy_sqlite3_reset)(stmt.get());
145+
ASSERT_SQLITE_OK(rc, admindb);
97146
}
147+
// Statement automatically finalized when stmt goes out of scope
98148
admindb->execute("PRAGMA foreign_keys = ON");
99149
free(groupname);
100150
return i;

‎test/tap/groups/groups.json‎

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Original file line numberDiff line numberDiff line change
@@ -217,6 +217,7 @@
217217
"eof_packet_mixed_queries-t" : [ "default-g4","mysql-auto_increment_delay_multiplex=0-g4","mysql-multiplexing=false-g4","mysql-query_digests=0-g4","mysql-query_digests_keep_comment=1-g4" ],
218218
"ok_packet_mixed_queries-t" : [ "default-g4","mysql-auto_increment_delay_multiplex=0-g4","mysql-multiplexing=false-g4","mysql-query_digests=0-g4","mysql-query_digests_keep_comment=1-g4" ],
219219
"test_load_from_config_validation-t" : [ "default-g4","mysql-auto_increment_delay_multiplex=0-g4","mysql-multiplexing=false-g4","mysql-query_digests=0-g4","mysql-query_digests_keep_comment=1-g4" ],
220+
"test_load_from_config_prefix_stripping-t" : [ "default-g4","mysql-auto_increment_delay_multiplex=0-g4","mysql-multiplexing=false-g4","mysql-query_digests=0-g4","mysql-query_digests_keep_comment=1-g4" ],
220221
"mysql-show_ssl_version-t": [ "default-g4", "mysql-auto_increment_delay_multiplex=0-g4", "mysql-multiplexing=false-g4", "mysql-query_digests=0-g4", "mysql-query_digests_keep_comment=1-g4" ],
221222
"mysql-watchdog_test-t": [ "default-g4", "mysql-auto_increment_delay_multiplex=0-g4", "mysql-multiplexing=false-g4", "mysql-query_digests=0-g4", "mysql-query_digests_keep_comment=1-g4" ],
222223
"pgsql-extended_query_protocol_query_rules_test-t": [ "default-g4", "mysql-auto_increment_delay_multiplex=0-g4", "mysql-multiplexing=false-g4", "mysql-query_digests=0-g4", "mysql-query_digests_keep_comment=1-g4" ],

‎test/tap/tests/test_load_from_config_prefix_stripping-t.cpp‎

Lines changed: 218 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,218 @@
1+
/**
2+
* @file test_load_from_config_prefix_stripping-t.cpp
3+
* @brief Test automatic prefix stripping for mysql_variables, pgsql_variables, and admin_variables
4+
*
5+
* This test validates that when users mistakenly include module prefix
6+
* (e.g., "mysql-") in configuration variable names, the prefix is automatically
7+
* stripped and the variable is stored with a single prefix.
8+
*/
9+
10+
#include <cstddef>
11+
#include <cstring>
12+
#include <string>
13+
#include <fstream>
14+
#include <unistd.h>
15+
#include "mysql.h"
16+
17+
#include "tap.h"
18+
#include "utils.h"
19+
#include "command_line.h"
20+
21+
using std::string;
22+
using std::fstream;
23+
24+
void create_config_with_prefixed_variables(const string& config_file_path) {
25+
string config_content = R"(
26+
datadir="/tmp"
27+
errorlog="/tmp/proxysql.log"
28+
29+
admin_variables=
30+
{
31+
admin-admin_credentials="admin:admin"
32+
admin-mysql_ifaces="0.0.0.0:6032"
33+
refresh_interval=2000
34+
}
35+
36+
mysql_variables=
37+
{
38+
mysql-log_unhealthy_connections=false
39+
mysql-threads=2
40+
mysql-max_connections=2048
41+
poll_timeout=1000
42+
default_schema="information_schema"
43+
server_version="5.5.30"
44+
connect_timeout_server=3000
45+
monitor_username="monitor"
46+
monitor_password="monitor"
47+
monitor_history=600000
48+
monitor_connect_interval=60000
49+
monitor_ping_interval=10000
50+
monitor_read_only_interval=1500
51+
monitor_read_only_timeout=500
52+
ping_interval_server_msec=120000
53+
ping_timeout_server=500
54+
commands_stats=true
55+
sessions_sort=true
56+
connect_retries_on_failure=10
57+
}
58+
59+
pgsql_variables=
60+
{
61+
pgsql-log_unhealthy_connections=false
62+
pgsql-threads=3
63+
pgsql-max_connections=5000
64+
pgsql-poll_timeout=3000
65+
pgsql-default_schema="public"
66+
pgsql-server_version="16.1"
67+
pgsql-connect_timeout_server=5000
68+
pgsql-monitor_username="pgsql_monitor"
69+
pgsql-monitor_password="pgsql_monitor"
70+
pgsql-monitor_history=300000
71+
pgsql-monitor_connect_interval=30000
72+
pgsql-monitor_ping_interval=5000
73+
pgsql-monitor_read_only_interval=1000
74+
pgsql-monitor_read_only_timeout=250
75+
pgsql-ping_interval_server_msec=60000
76+
pgsql-ping_timeout_server=250
77+
pgsql-commands_stats=false
78+
pgsql-sessions_sort=false
79+
pgsql-connect_retries_on_failure=5
80+
}
81+
82+
mysql_servers=
83+
(
84+
)
85+
86+
mysql_users=
87+
(
88+
)
89+
90+
mysql_query_rules=
91+
(
92+
)
93+
)";
94+
95+
fstream config_file;
96+
config_file.open(config_file_path, std::ios::out);
97+
config_file << config_content;
98+
config_file.close();
99+
}
100+
101+
int main(int argc, char** argv) {
102+
CommandLine cl;
103+
104+
if (cl.getEnv()) {
105+
diag("Failed to get the required environmental variables.");
106+
return EXIT_FAILURE;
107+
}
108+
109+
plan(12); // 4 tests for each module: prefixed and non-prefixed variables
110+
111+
MYSQL* admin = mysql_init(NULL);
112+
if (!admin) {
113+
fprintf(stderr, "Failed to initialize MySQL client\n");
114+
return exit_status();
115+
}
116+
117+
if (!mysql_real_connect(admin, cl.host, cl.admin_username, cl.admin_password, NULL, cl.admin_port, NULL, 0)) {
118+
fprintf(stderr, "Failed to connect to database: Error: %s\n", mysql_error(admin));
119+
return exit_status();
120+
}
121+
122+
string config_file = "/tmp/proxysql_test_prefix_stripping.cfg";
123+
create_config_with_prefixed_variables(config_file);
124+
125+
// Set config file
126+
string set_config_cmd = "PROXYSQL SET CONFIG FILE '" + config_file + "'";
127+
MYSQL_QUERY_T(admin, set_config_cmd.c_str());
128+
129+
// Clear existing variables first
130+
MYSQL_QUERY_T(admin, "DELETE FROM global_variables WHERE variable_name LIKE 'mysql-%'");
131+
MYSQL_QUERY_T(admin, "DELETE FROM global_variables WHERE variable_name LIKE 'pgsql-%'");
132+
MYSQL_QUERY_T(admin, "DELETE FROM global_variables WHERE variable_name LIKE 'admin-%'");
133+
134+
// Test MySQL variables
135+
diag("Testing MySQL variables prefix stripping");
136+
MYSQL_QUERY_T(admin, "LOAD MYSQL VARIABLES FROM CONFIG");
137+
138+
// Check prefixed variable (should be stored as mysql-log_unhealthy_connections)
139+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'mysql-log_unhealthy_connections'");
140+
MYSQL_RES* result = mysql_store_result(admin);
141+
int row_count = mysql_num_rows(result);
142+
ok(row_count == 1, "mysql-log_unhealthy_connections variable exists");
143+
if (row_count == 1) {
144+
MYSQL_ROW row = mysql_fetch_row(result);
145+
ok(strcmp(row[0], "false") == 0, "mysql-log_unhealthy_connections value is 'false'");
146+
}
147+
mysql_free_result(result);
148+
149+
// Check non-prefixed variable (should be stored as mysql-poll_timeout)
150+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'mysql-poll_timeout'");
151+
result = mysql_store_result(admin);
152+
row_count = mysql_num_rows(result);
153+
ok(row_count == 1, "mysql-poll_timeout variable exists");
154+
if (row_count == 1) {
155+
MYSQL_ROW row = mysql_fetch_row(result);
156+
ok(strcmp(row[0], "1000") == 0, "mysql-poll_timeout value is '1000'");
157+
}
158+
mysql_free_result(result);
159+
160+
// Test PostgreSQL variables
161+
diag("Testing PostgreSQL variables prefix stripping");
162+
MYSQL_QUERY_T(admin, "LOAD PGSQL VARIABLES FROM CONFIG");
163+
164+
// Check prefixed variable (should be stored as pgsql-log_unhealthy_connections)
165+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'pgsql-log_unhealthy_connections'");
166+
result = mysql_store_result(admin);
167+
row_count = mysql_num_rows(result);
168+
ok(row_count == 1, "pgsql-log_unhealthy_connections variable exists");
169+
if (row_count == 1) {
170+
MYSQL_ROW row = mysql_fetch_row(result);
171+
ok(strcmp(row[0], "false") == 0, "pgsql-log_unhealthy_connections value is 'false'");
172+
}
173+
mysql_free_result(result);
174+
175+
// Check non-prefixed variable (pgsql_variables doesn't have non-prefixed in our config)
176+
// Instead check pgsql-threads
177+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'pgsql-threads'");
178+
result = mysql_store_result(admin);
179+
row_count = mysql_num_rows(result);
180+
ok(row_count == 1, "pgsql-threads variable exists");
181+
if (row_count == 1) {
182+
MYSQL_ROW row = mysql_fetch_row(result);
183+
// Note: threads may have a minimum value enforced, so we just check existence
184+
ok(true, "pgsql-threads value is set");
185+
}
186+
mysql_free_result(result);
187+
188+
// Test Admin variables
189+
diag("Testing Admin variables prefix stripping");
190+
MYSQL_QUERY_T(admin, "LOAD ADMIN VARIABLES FROM CONFIG");
191+
192+
// Check prefixed variable (should be stored as admin-admin_credentials)
193+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'admin-admin_credentials'");
194+
result = mysql_store_result(admin);
195+
row_count = mysql_num_rows(result);
196+
ok(row_count == 1, "admin-admin_credentials variable exists");
197+
if (row_count == 1) {
198+
MYSQL_ROW row = mysql_fetch_row(result);
199+
ok(strcmp(row[0], "admin:admin") == 0, "admin-admin_credentials value is 'admin:admin'");
200+
}
201+
mysql_free_result(result);
202+
203+
// Check non-prefixed variable (should be stored as admin-refresh_interval)
204+
MYSQL_QUERY_T(admin, "SELECT variable_value FROM global_variables WHERE variable_name = 'admin-refresh_interval'");
205+
result = mysql_store_result(admin);
206+
row_count = mysql_num_rows(result);
207+
ok(row_count == 1, "admin-refresh_interval variable exists");
208+
if (row_count == 1) {
209+
MYSQL_ROW row = mysql_fetch_row(result);
210+
ok(strcmp(row[0], "2000") == 0, "admin-refresh_interval value is '2000'");
211+
}
212+
mysql_free_result(result);
213+
214+
unlink(config_file.c_str());
215+
mysql_close(admin);
216+
217+
return exit_status();
218+
}

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