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CONC-589: First query fails after reconnect

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If automatic reconnect is enabled (MYSQL_OPT_RECONNECT) it is
mandatory to check if the connection/socket is still alive before
sending a command to the server (unless the command is COM_QUIT).
This commit is contained in:
Georg Richter
2025-01-15 07:26:18 +01:00
parent 12a7054194
commit e09e24e890
2 changed files with 56 additions and 0 deletions
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9
libmariadb/mariadb_lib.c
View File

@ -382,6 +382,15 @@ mthd_my_send_cmd(MYSQL *mysql,enum enum_server_command command, const char *arg,
{
NET *net= &mysql->net;
int result= -1;
/* CONC-589: If reconnect option was specified, we have to check if the connection
(socket) is still available */
if (command != COM_QUIT && mysql->options.reconnect && ma_pvio_is_alive(mysql->net.pvio))
{
mysql->net.pvio= NULL;
mysql->net.error= 1;
}
if (mysql->net.pvio == 0)
{
/* Do reconnect if possible */

47
unittest/libmariadb/connection.c
View File

@ -1998,7 +1998,54 @@ static int test_conc748(MYSQL *my __attribute__((unused)))
}
#endif
static int test_conc589(MYSQL *my)
{
MYSQL *mysql= mysql_init(NULL);
MYSQL_RES *result;
int rc;
my_bool reconnect= 1, verify= 0;
unsigned long last_thread_id= 0;
mysql_options(mysql, MYSQL_OPT_RECONNECT, &reconnect);
mysql_options(mysql, MYSQL_OPT_SSL_VERIFY_SERVER_CERT, &verify);
if (!my_test_connect(mysql, hostname, username,
password, schema, port, socketname, CLIENT_REMEMBER_OPTIONS))
{
diag("error: %s", mysql_error(mysql));
return FAIL;
}
rc= mysql_query(mysql, "SET SESSION wait_timeout=5");
check_mysql_rc(rc, mysql);
last_thread_id= mysql_thread_id(mysql);
if ((rc= mysql_query(mysql, "SELECT 1")) || (result= mysql_store_result(mysql)) == NULL)
check_mysql_rc(rc, mysql);
mysql_free_result(result);
sleep(10);
if ((rc= mysql_query(mysql, "SELECT 2")) || (result= mysql_store_result(mysql)) == NULL)
check_mysql_rc(rc, mysql);
mysql_free_result(result);
FAIL_IF(mysql_thread_id(mysql) == last_thread_id, "Expected new connection id");
last_thread_id= mysql_thread_id(mysql);
mysql_kill(my, last_thread_id);
sleep(10);
if ((rc= mysql_query(mysql, "SELECT 3")) || (result= mysql_store_result(mysql)) == NULL)
check_mysql_rc(rc, mysql);
mysql_free_result(result);
FAIL_IF(mysql_thread_id(mysql) == last_thread_id, "Expected new connection id");
mysql_close(mysql);
return OK;
}
struct my_tests_st my_tests[] = {
{"test_conc589", test_conc589, TEST_CONNECTION_DEFAULT, 0, NULL, NULL},
#if defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
{"test_conc748", test_conc748, TEST_CONNECTION_NONE, 0, NULL, NULL},
#endif