2 This file is part of GNUnet
3 (C) 2006, 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file datacache/plugin_datacache_mysql.c
23 * @brief mysql for an implementation of a database backend for the datacache
24 * @author Christian Grothoff
28 * 1) Access mysql as root,
34 * and do the following. [You should replace $USER with the username
35 * that will be running the gnunetd process].
37 CREATE DATABASE gnunet;
38 GRANT select,insert,update,delete,create,alter,drop,create temporary tables
39 ON gnunet.* TO $USER@localhost;
40 SET PASSWORD FOR $USER@localhost=PASSWORD('$the_password_you_like');
43 * 2) In the $HOME directory of $USER, create a ".my.cnf" file
44 * with the following lines
48 password=$the_password_you_like
51 * Thats it -- now you can configure your datastores in GNUnet to
52 * use MySQL. Note that .my.cnf file is a security risk unless its on
53 * a safe partition etc. The $HOME/.my.cnf can of course be a symbolic
54 * link. Even greater security risk can be achieved by setting no
55 * password for $USER. Luckily $USER has only priviledges to mess
56 * up GNUnet's tables, nothing else (unless you give him more,
59 * 3) Still, perhaps you should briefly try if the DB connection
60 * works. First, login as $USER. Then use,
62 $ mysql -u $USER -p $the_password_you_like
66 * If you get the message "Database changed" it probably works.
68 * [If you get "ERROR 2002: Can't connect to local MySQL server
69 * through socket '/tmp/mysql.sock' (2)" it may be resolvable by
70 * "ln -s /var/run/mysqld/mysqld.sock /tmp/mysql.sock"
71 * so there may be some additional trouble depending on your mysql setup.]
75 * If you have problems related to the mysql module, your best
76 * friend is probably the mysql manual. The first thing to check
77 * is that mysql is basically operational, that you can connect
78 * to it, create tables, issue queries etc.
81 #include "gnunet_util_lib.h"
82 #include "gnunet_datacache_plugin.h"
83 #include <mysql/mysql.h>
85 #define DEBUG_DATACACHE_MYSQL GNUNET_NO
88 * Estimate of the per-entry overhead (including indices).
90 #define OVERHEAD ((4*2+4*2+8*2+8*2+sizeof(GNUNET_HashCode)*5+8))
93 * Maximum number of supported parameters for a prepared
94 * statement. Increase if needed.
99 * Die with an error message that indicates
100 * a failure of the command 'cmd' with the message given
101 * by strerror(errno).
103 #define DIE_MYSQL(cmd, dbh) do { GNUNET_log(GNUNET_ERROR_TYPE__ERROR, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, mysql_error((dbh)->dbf)); abort(); } while(0);
106 * Log an error message at log-level 'level' that indicates
107 * a failure of the command 'cmd' on file 'filename'
108 * with the message given by strerror(errno).
110 #define LOG_MYSQL(level, cmd, dbh) do { GNUNET_log(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, mysql_error((dbh)->dbf)); } while(0);
112 struct GNUNET_MysqlStatementHandle
114 struct GNUNET_MysqlStatementHandle *next;
116 struct GNUNET_MysqlStatementHandle *prev;
120 MYSQL_STMT *statement;
128 * Context for all functions in this plugin.
133 * Our execution environment.
135 struct GNUNET_DATACACHE_PluginEnvironment *env;
138 * Handle to the mysql database.
142 struct GNUNET_MysqlStatementHandle *shead;
144 struct GNUNET_MysqlStatementHandle *stail;
147 * Filename of "my.cnf" (msyql configuration).
151 #define SELECT_VALUE_STMT "SELECT value,expire FROM gn080dstore FORCE INDEX (hashidx) WHERE hash=? AND type=? AND expire >= ? LIMIT 1 OFFSET ?"
152 struct GNUNET_MysqlStatementHandle *select_value;
154 #define COUNT_VALUE_STMT "SELECT count(*) FROM gn080dstore FORCE INDEX (hashidx) WHERE hash=? AND type=? AND expire >= ?"
155 struct GNUNET_MysqlStatementHandle *count_value;
157 #define SELECT_OLD_VALUE_STMT "SELECT hash, vhash, type, value FROM gn080dstore FORCE INDEX (expireidx) ORDER BY puttime ASC LIMIT 1"
158 struct GNUNET_MysqlStatementHandle *select_old_value;
160 #define DELETE_VALUE_STMT "DELETE FROM gn080dstore WHERE hash = ? AND vhash = ? AND type = ? AND value = ?"
161 struct GNUNET_MysqlStatementHandle *delete_value;
163 #define INSERT_VALUE_STMT "INSERT INTO gn080dstore (type, puttime, expire, hash, vhash, value) "\
164 "VALUES (?, ?, ?, ?, ?, ?)"
165 struct GNUNET_MysqlStatementHandle *insert_value;
167 #define UPDATE_VALUE_STMT "UPDATE gn080dstore FORCE INDEX (allidx) SET puttime=?, expire=? "\
168 "WHERE hash=? AND vhash=? AND type=?"
169 struct GNUNET_MysqlStatementHandle *update_value;
175 * Obtain the location of ".my.cnf".
177 * @param cfg our configuration
178 * @return NULL on error
181 get_my_cnf_path (const struct GNUNET_CONFIGURATION_Handle *cfg)
192 pw = getpwuid (getuid ());
195 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
200 GNUNET_CONFIGURATION_have_value (cfg,
201 "datacache-mysql", "CONFIG"))
203 GNUNET_assert (GNUNET_OK ==
204 GNUNET_CONFIGURATION_get_value_filename (cfg,
205 "datacache-mysql", "CONFIG", &cnffile));
206 configured = GNUNET_YES;
210 home_dir = GNUNET_strdup (pw->pw_dir);
212 home_dir = (char *) GNUNET_malloc (_MAX_PATH + 1);
213 plibc_conv_to_win_path ("~/", home_dir);
215 GNUNET_asprintf (&cnffile, "%s/.my.cnf", home_dir);
216 GNUNET_free (home_dir);
217 configured = GNUNET_NO;
219 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
220 _("Trying to use file `%s' for MySQL configuration.\n"),
222 if ((0 != STAT (cnffile, &st)) ||
223 (0 != ACCESS (cnffile, R_OK)) || (!S_ISREG (st.st_mode)))
225 if (configured == GNUNET_YES)
226 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
227 _("Could not access file `%s': %s\n"), cnffile,
229 GNUNET_free (cnffile);
237 * Free a prepared statement.
239 * @param plugin plugin context
240 * @param s prepared statement
243 prepared_statement_destroy (struct Plugin *plugin,
244 struct GNUNET_MysqlStatementHandle
247 GNUNET_CONTAINER_DLL_remove (plugin->shead,
251 mysql_stmt_close (s->statement);
252 GNUNET_free (s->query);
258 * Close database connection and all prepared statements (we got a DB
262 iclose (struct Plugin *plugin)
264 struct GNUNET_MysqlStatementHandle *spos;
266 spos = plugin->shead;
267 while (NULL != plugin->shead)
268 prepared_statement_destroy (plugin,
270 if (plugin->dbf != NULL)
272 mysql_close (plugin->dbf);
280 * Open the connection with the database (and initialize
281 * our default options).
283 * @return GNUNET_OK on success
286 iopen (struct Plugin *ret)
291 char *mysql_password;
292 unsigned long long mysql_port;
294 unsigned int timeout;
296 ret->dbf = mysql_init (NULL);
297 if (ret->dbf == NULL)
298 return GNUNET_SYSERR;
299 if (ret->cnffile != NULL)
300 mysql_options (ret->dbf, MYSQL_READ_DEFAULT_FILE, ret->cnffile);
301 mysql_options (ret->dbf, MYSQL_READ_DEFAULT_GROUP, "client");
303 mysql_options (ret->dbf, MYSQL_OPT_RECONNECT, &reconnect);
304 mysql_options (ret->dbf,
305 MYSQL_OPT_CONNECT_TIMEOUT, (const void *) &timeout);
306 mysql_options(ret->dbf, MYSQL_SET_CHARSET_NAME, "UTF8");
307 timeout = 60; /* in seconds */
308 mysql_options (ret->dbf, MYSQL_OPT_READ_TIMEOUT, (const void *) &timeout);
309 mysql_options (ret->dbf, MYSQL_OPT_WRITE_TIMEOUT, (const void *) &timeout);
311 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
312 "datacache-mysql", "DATABASE"))
313 GNUNET_assert (GNUNET_OK ==
314 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
315 "datacache-mysql", "DATABASE",
318 mysql_dbname = GNUNET_strdup ("gnunet");
320 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
321 "datacache-mysql", "USER"))
323 GNUNET_assert (GNUNET_OK ==
324 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
325 "datacache-mysql", "USER",
328 mysql_password = NULL;
329 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
330 "datacache-mysql", "PASSWORD"))
332 GNUNET_assert (GNUNET_OK ==
333 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
334 "datacache-mysql", "PASSWORD",
338 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
339 "datacache-mysql", "HOST"))
341 GNUNET_assert (GNUNET_OK ==
342 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
343 "datacache-mysql", "HOST",
347 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
348 "datacache-mysql", "PORT"))
350 GNUNET_assert (GNUNET_OK ==
351 GNUNET_CONFIGURATION_get_value_number (ret->env->cfg, "datacache-mysql",
352 "PORT", &mysql_port));
355 GNUNET_assert (mysql_dbname != NULL);
356 mysql_real_connect (ret->dbf, mysql_server, mysql_user, mysql_password,
357 mysql_dbname, (unsigned int) mysql_port, NULL,
358 CLIENT_IGNORE_SIGPIPE);
359 GNUNET_free_non_null (mysql_server);
360 GNUNET_free_non_null (mysql_user);
361 GNUNET_free_non_null (mysql_password);
362 GNUNET_free (mysql_dbname);
363 if (mysql_error (ret->dbf)[0])
365 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR,
366 "mysql_real_connect", ret);
367 return GNUNET_SYSERR;
374 * Run the given MySQL statement.
376 * @return GNUNET_OK on success, GNUNET_SYSERR on error
379 run_statement (struct Plugin *plugin,
380 const char *statement)
382 if ((NULL == plugin->dbf) && (GNUNET_OK != iopen (plugin)))
383 return GNUNET_SYSERR;
384 mysql_query (plugin->dbf, statement);
385 if (mysql_error (plugin->dbf)[0])
387 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR,
388 "mysql_query", plugin);
390 return GNUNET_SYSERR;
396 * Create a prepared statement.
398 * @return NULL on error
400 static struct GNUNET_MysqlStatementHandle *
401 prepared_statement_create (struct Plugin *plugin,
402 const char *statement)
404 struct GNUNET_MysqlStatementHandle *ret;
406 ret = GNUNET_malloc (sizeof (struct GNUNET_MysqlStatementHandle));
407 ret->query = GNUNET_strdup (statement);
408 GNUNET_CONTAINER_DLL_insert (plugin->shead,
416 * Prepare a statement for running.
418 * @return GNUNET_OK on success
421 prepare_statement (struct Plugin *plugin,
422 struct GNUNET_MysqlStatementHandle *ret)
424 if (GNUNET_YES == ret->valid)
426 if ((NULL == plugin->dbf) &&
427 (GNUNET_OK != iopen (plugin)))
428 return GNUNET_SYSERR;
429 ret->statement = mysql_stmt_init (plugin->dbf);
430 if (ret->statement == NULL)
433 return GNUNET_SYSERR;
435 if (mysql_stmt_prepare (ret->statement,
437 strlen (ret->query)))
439 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR,
440 "mysql_stmt_prepare",
442 mysql_stmt_close (ret->statement);
443 ret->statement = NULL;
445 return GNUNET_SYSERR;
447 ret->valid = GNUNET_YES;
454 * Bind the parameters for the given MySQL statement
457 * @param plugin plugin context
458 * @param s statement to bind and run
459 * @param ap arguments for the binding
460 * @return GNUNET_SYSERR on error, GNUNET_OK on success
463 init_params (struct Plugin *plugin,
464 struct GNUNET_MysqlStatementHandle *s,
467 MYSQL_BIND qbind[MAX_PARAM];
470 enum enum_field_types ft;
472 pc = mysql_stmt_param_count (s->statement);
475 /* increase internal constant! */
477 return GNUNET_SYSERR;
479 memset (qbind, 0, sizeof (qbind));
482 while ( (pc > 0) && (-1 != (int) (ft = va_arg (ap, enum enum_field_types))) )
484 qbind[off].buffer_type = ft;
487 case MYSQL_TYPE_FLOAT:
488 qbind[off].buffer = va_arg (ap, float *);
490 case MYSQL_TYPE_LONGLONG:
491 qbind[off].buffer = va_arg (ap, unsigned long long *);
492 qbind[off].is_unsigned = va_arg (ap, int);
494 case MYSQL_TYPE_LONG:
495 qbind[off].buffer = va_arg (ap, unsigned int *);
496 qbind[off].is_unsigned = va_arg (ap, int);
498 case MYSQL_TYPE_VAR_STRING:
499 case MYSQL_TYPE_STRING:
500 case MYSQL_TYPE_BLOB:
501 qbind[off].buffer = va_arg (ap, void *);
502 qbind[off].buffer_length = va_arg (ap, unsigned long);
503 qbind[off].length = va_arg (ap, unsigned long *);
506 /* unsupported type */
508 return GNUNET_SYSERR;
513 if (! ( (pc == 0) && (-1 != (int) ft) && (va_arg (ap, int) == -1)) )
516 return GNUNET_SYSERR;
518 if (mysql_stmt_bind_param (s->statement, qbind))
520 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
521 _("`%s' failed at %s:%d with error: %s\n"),
522 "mysql_stmt_bind_param",
523 __FILE__, __LINE__, mysql_stmt_error (s->statement));
525 return GNUNET_SYSERR;
527 if (mysql_stmt_execute (s->statement))
529 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
530 _("`%s' failed at %s:%d with error: %s\n"),
531 "mysql_stmt_execute",
532 __FILE__, __LINE__, mysql_stmt_error (s->statement));
534 return GNUNET_SYSERR;
540 * Type of a callback that will be called for each
541 * data set returned from MySQL.
543 * @param cls user-defined argument
544 * @param num_values number of elements in values
545 * @param values values returned by MySQL
546 * @return GNUNET_OK to continue iterating, GNUNET_SYSERR to abort
548 typedef int (*GNUNET_MysqlDataProcessor) (void *cls,
549 unsigned int num_values,
550 MYSQL_BIND * values);
554 * Run a prepared SELECT statement.
556 * @param plugin plugin context
557 * @param s handle to SELECT statment
558 * @param result_size number of elements in results array
559 * @param results pointer to already initialized MYSQL_BIND
560 * array (of sufficient size) for passing results
561 * @param processor function to call on each result
562 * @param processor_cls extra argument to processor
563 * @param ... pairs and triplets of "MYSQL_TYPE_XXX" keys and their respective
564 * values (size + buffer-reference for pointers); terminated
566 * @return GNUNET_SYSERR on error, otherwise
567 * the number of successfully affected (or queried) rows
570 prepared_statement_run_select (struct Plugin *plugin,
571 struct GNUNET_MysqlStatementHandle
573 unsigned int result_size,
574 MYSQL_BIND * results,
575 GNUNET_MysqlDataProcessor
576 processor, void *processor_cls,
584 if (GNUNET_OK != prepare_statement (plugin, s))
587 return GNUNET_SYSERR;
589 va_start (ap, processor_cls);
590 if (GNUNET_OK != init_params (plugin, s, ap))
594 return GNUNET_SYSERR;
597 rsize = mysql_stmt_field_count (s->statement);
598 if (rsize > result_size)
601 return GNUNET_SYSERR;
603 if (mysql_stmt_bind_result (s->statement, results))
605 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
606 _("`%s' failed at %s:%d with error: %s\n"),
607 "mysql_stmt_bind_result",
608 __FILE__, __LINE__, mysql_stmt_error (s->statement));
610 return GNUNET_SYSERR;
616 ret = mysql_stmt_fetch (s->statement);
617 if (ret == MYSQL_NO_DATA)
621 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
622 _("`%s' failed at %s:%d with error: %s\n"),
624 __FILE__, __LINE__, mysql_stmt_error (s->statement));
626 return GNUNET_SYSERR;
628 if (processor != NULL)
629 if (GNUNET_OK != processor (processor_cls, rsize, results))
633 mysql_stmt_reset (s->statement);
640 * Run a prepared statement that does NOT produce results.
642 * @param plugin plugin context
643 * @param s handle to SELECT statment
644 * @param ... pairs and triplets of "MYSQL_TYPE_XXX" keys and their respective
645 * values (size + buffer-reference for pointers); terminated
647 * @param insert_id NULL or address where to store the row ID of whatever
648 * was inserted (only for INSERT statements!)
649 * @return GNUNET_SYSERR on error, otherwise
650 * the number of successfully affected rows
653 prepared_statement_run (struct Plugin *plugin,
654 struct GNUNET_MysqlStatementHandle *s,
655 unsigned long long *insert_id, ...)
660 if (GNUNET_OK != prepare_statement (plugin, s))
661 return GNUNET_SYSERR;
662 va_start (ap, insert_id);
663 if (GNUNET_OK != init_params (plugin, s, ap))
666 return GNUNET_SYSERR;
669 affected = mysql_stmt_affected_rows (s->statement);
670 if (NULL != insert_id)
671 *insert_id = (unsigned long long) mysql_stmt_insert_id (s->statement);
672 mysql_stmt_reset (s->statement);
678 * Create temporary table and prepare statements.
680 * @param plugin plugin context
681 * @return GNUNET_OK on success
684 itable (struct Plugin *plugin)
686 #define MRUNS(a) (GNUNET_OK != run_statement (plugin, a) )
687 if (MRUNS ("CREATE TEMPORARY TABLE gn080dstore ("
688 " type INT(11) UNSIGNED NOT NULL DEFAULT 0,"
689 " puttime BIGINT UNSIGNED NOT NULL DEFAULT 0,"
690 " expire BIGINT UNSIGNED NOT NULL DEFAULT 0,"
691 " hash BINARY(64) NOT NULL DEFAULT '',"
692 " vhash BINARY(64) NOT NULL DEFAULT '',"
693 " value BLOB NOT NULL DEFAULT '',"
694 " INDEX hashidx (hash(64),type,expire),"
695 " INDEX allidx (hash(64),vhash(64),type),"
696 " INDEX expireidx (puttime)" ") ENGINE=InnoDB") ||
697 MRUNS ("SET AUTOCOMMIT = 1"))
698 return GNUNET_SYSERR;
700 #define PINIT(a,b) (NULL == (a = prepared_statement_create(plugin, b)))
701 if (PINIT (plugin->select_value, SELECT_VALUE_STMT) ||
702 PINIT (plugin->count_value, COUNT_VALUE_STMT) ||
703 PINIT (plugin->select_old_value, SELECT_OLD_VALUE_STMT) ||
704 PINIT (plugin->delete_value, DELETE_VALUE_STMT) ||
705 PINIT (plugin->insert_value, INSERT_VALUE_STMT) ||
706 PINIT (plugin->update_value, UPDATE_VALUE_STMT))
707 return GNUNET_SYSERR;
714 * Store an item in the datastore.
716 * @param cls closure (our "struct Plugin")
717 * @param key key to store data under
718 * @param size number of bytes in data
719 * @param data data to store
720 * @param type type of the value
721 * @param discard_time when to discard the value in any case
722 * @return 0 on error, number of bytes used otherwise
725 mysql_plugin_put (void *cls,
726 const GNUNET_HashCode * key,
729 enum GNUNET_BLOCK_Type type,
730 struct GNUNET_TIME_Absolute discard_time)
732 struct Plugin *plugin = cls;
733 struct GNUNET_TIME_Absolute now;
734 unsigned long k_length;
735 unsigned long h_length;
736 unsigned long v_length;
737 unsigned long long v_now;
738 unsigned long long v_discard_time;
740 GNUNET_HashCode vhash;
743 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
744 return GNUNET_SYSERR;
745 GNUNET_CRYPTO_hash (data, size, &vhash);
746 now = GNUNET_TIME_absolute_get ();
748 /* first try UPDATE */
749 h_length = sizeof (GNUNET_HashCode);
750 k_length = sizeof (GNUNET_HashCode);
753 v_now = (unsigned long long) now.abs_value;
754 v_discard_time = (unsigned long long) discard_time.abs_value;
756 prepared_statement_run (plugin,
757 plugin->update_value,
767 sizeof (GNUNET_HashCode),
771 sizeof (GNUNET_HashCode),
779 h_length = sizeof (GNUNET_HashCode);
780 k_length = sizeof (GNUNET_HashCode);
783 (ret = prepared_statement_run (plugin,
784 plugin->insert_value,
797 sizeof (GNUNET_HashCode),
801 sizeof (GNUNET_HashCode),
805 (unsigned long) size,
808 if (ret == GNUNET_SYSERR)
810 return GNUNET_SYSERR;
812 return size + OVERHEAD;
817 return_ok (void *cls, unsigned int num_values, MYSQL_BIND * values)
824 * Iterate over the results for a particular key
827 * @param cls closure (our "struct Plugin")
829 * @param type entries of which type are relevant?
830 * @param iter maybe NULL (to just count)
831 * @param iter_cls closure for iter
832 * @return the number of results found
835 mysql_plugin_get (void *cls,
836 const GNUNET_HashCode * key,
837 enum GNUNET_BLOCK_Type type,
838 GNUNET_DATACACHE_Iterator iter,
841 struct Plugin *plugin = cls;
843 unsigned long h_length;
844 unsigned long v_length;
845 unsigned long long v_expire;
846 struct GNUNET_TIME_Absolute now;
847 struct GNUNET_TIME_Absolute expire;
849 unsigned long long total;
850 unsigned long long v_now;
854 char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
856 now = GNUNET_TIME_absolute_get ();
857 h_length = sizeof (GNUNET_HashCode);
858 v_length = sizeof (buffer);
860 memset (rbind, 0, sizeof (rbind));
861 rbind[0].buffer_type = MYSQL_TYPE_LONGLONG;
862 rbind[0].buffer = &total;
863 rbind[0].is_unsigned = GNUNET_YES;
865 v_now = (unsigned long long) now.abs_value;
867 (ret = prepared_statement_run_select (plugin,
885 if (ret == GNUNET_SYSERR)
887 return GNUNET_SYSERR;
889 if ((iter == NULL) || (total == 0))
892 off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, total);
896 memset (rbind, 0, sizeof (rbind));
897 rbind[0].buffer_type = MYSQL_TYPE_BLOB;
898 rbind[0].buffer_length = sizeof (buffer);
899 rbind[0].length = &v_length;
900 rbind[0].buffer = buffer;
901 rbind[1].buffer_type = MYSQL_TYPE_LONGLONG;
902 rbind[1].is_unsigned = 1;
903 rbind[1].buffer = &v_expire;
904 off = (off + 1) % total;
906 (ret = prepared_statement_run_select (plugin,
907 plugin->select_value,
928 if (ret == GNUNET_SYSERR)
930 return GNUNET_SYSERR;
933 expire.abs_value = v_expire;
934 if (GNUNET_OK != iter (iter_cls,
946 * Delete the entry with the lowest expiration value
947 * from the datacache right now.
949 * @param cls closure (our "struct Plugin")
950 * @return GNUNET_OK on success, GNUNET_SYSERR on error
953 mysql_plugin_del (void *cls)
955 struct Plugin *plugin = cls;
959 GNUNET_HashCode v_key;
960 GNUNET_HashCode vhash;
961 unsigned long k_length;
962 unsigned long h_length;
963 unsigned long v_length;
965 char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
967 k_length = sizeof (GNUNET_HashCode);
968 h_length = sizeof (GNUNET_HashCode);
969 v_length = sizeof (buffer);
970 memset (rbind, 0, sizeof (rbind));
971 rbind[0].buffer_type = MYSQL_TYPE_BLOB;
972 rbind[0].buffer_length = sizeof (GNUNET_HashCode);
973 rbind[0].length = &k_length;
974 rbind[0].buffer = &v_key;
975 rbind[1].buffer_type = MYSQL_TYPE_BLOB;
976 rbind[1].buffer_length = sizeof (GNUNET_HashCode);
977 rbind[1].length = &h_length;
978 rbind[1].buffer = &vhash;
979 rbind[2].buffer_type = MYSQL_TYPE_LONG;
980 rbind[2].is_unsigned = 1;
981 rbind[2].buffer = &v_type;
982 rbind[3].buffer_type = MYSQL_TYPE_BLOB;
983 rbind[3].buffer_length = sizeof (buffer);
984 rbind[3].length = &v_length;
985 rbind[3].buffer = buffer;
987 (ret = prepared_statement_run_select (plugin,
988 plugin->select_old_value,
995 (ret = prepared_statement_run (plugin,
996 plugin->delete_value,
1000 sizeof (GNUNET_HashCode),
1004 sizeof (GNUNET_HashCode),
1015 if (ret == GNUNET_SYSERR)
1017 return GNUNET_SYSERR;
1019 plugin->env->delete_notify (plugin->env->cls,
1021 v_length + OVERHEAD);
1028 * Entry point for the plugin.
1030 * @param cls closure (the "struct GNUNET_DATACACHE_PluginEnvironmnet")
1031 * @return the plugin's closure (our "struct Plugin")
1034 libgnunet_plugin_datacache_mysql_init (void *cls)
1036 struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
1037 struct GNUNET_DATACACHE_PluginFunctions *api;
1038 struct Plugin *plugin;
1040 plugin = GNUNET_malloc (sizeof (struct Plugin));
1042 plugin->cnffile = get_my_cnf_path (env->cfg);
1046 GNUNET_free_non_null (plugin->cnffile);
1047 GNUNET_free (plugin);
1054 GNUNET_free_non_null (plugin->cnffile);
1055 GNUNET_free (plugin);
1058 api = GNUNET_malloc (sizeof (struct GNUNET_DATACACHE_PluginFunctions));
1060 api->get = &mysql_plugin_get;
1061 api->put = &mysql_plugin_put;
1062 api->del = &mysql_plugin_del;
1063 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1064 "mysql", _("MySQL datacache running\n"));
1070 * Exit point from the plugin.
1072 * @param cls closure (our "struct Plugin")
1076 libgnunet_plugin_datacache_mysql_done (void *cls)
1078 struct GNUNET_DATACACHE_PluginFunctions *api = cls;
1079 struct Plugin *plugin = api->cls;
1082 GNUNET_free_non_null (plugin->cnffile);
1083 GNUNET_free (plugin);
1085 mysql_library_end ();
1090 /* end of plugin_datacache_mysql.c */