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Always replace MySQL users in MySQLAuth

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Doing the checksum matching after memory is allocated and all the work is
done is not very efficient. A simpler solution is to always replace the
users when we reload them.

Replacing the users every time the service users are reloaded will not
cause a degradation in performance because the previous implementation
already does all the extra work but then just discards it.

A faster solution would be to first query the server and request some sort
of a checksum based on the result set the users query would
create. Currently, this can be done inside a stored procedure but it is
not very convenient for the average user. Another option would be to
generate a long string with GROUP_CONCAT but it is highly likely that some
internal buffer limit is hit before the complete value is calculated.
This commit is contained in:
Markus Makela
2016-10-21 13:07:18 +03:00
parent 8f55cfbc16
commit a4a7e806d0
2 changed files with 7 additions and 48 deletions
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2
server/modules/authenticator/MySQLAuth/dbusers.h
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@ -59,11 +59,9 @@ extern int add_mysql_users_with_host_ipv4(USERS *users, const char *user, const
extern bool check_service_permissions(SERVICE* service);
extern int dbusers_load(USERS *, const char *filename);
extern int dbusers_save(USERS *, const char *filename);
extern int load_mysql_users(SERV_LISTENER *listener);
extern int mysql_users_add(USERS *users, MYSQL_USER_HOST *key, char *auth);
extern USERS *mysql_users_alloc();
extern char *mysql_users_fetch(USERS *users, MYSQL_USER_HOST *key);
extern int reload_mysql_users(SERV_LISTENER *listener);
extern int replace_mysql_users(SERV_LISTENER *listener);
MXS_END_DECLS