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)
193 pw = getpwuid (getuid ());
196 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "getpwuid");
200 GNUNET_CONFIGURATION_have_value (cfg, "datacache-mysql", "CONFIG"))
202 GNUNET_assert (GNUNET_OK ==
203 GNUNET_CONFIGURATION_get_value_filename (cfg,
207 configured = GNUNET_YES;
211 home_dir = GNUNET_strdup (pw->pw_dir);
212 GNUNET_asprintf (&cnffile, "%s/.my.cnf", home_dir);
213 GNUNET_free (home_dir);
214 configured = GNUNET_NO;
217 home_dir = (char *) GNUNET_malloc (_MAX_PATH + 1);
218 plibc_conv_to_win_path ("~/", home_dir);
219 GNUNET_asprintf (&cnffile, "%s/.my.cnf", home_dir);
220 GNUNET_free (home_dir);
221 configured = GNUNET_NO;
223 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
224 _("Trying to use file `%s' for MySQL configuration.\n"), cnffile);
225 if ((0 != STAT (cnffile, &st)) ||
226 (0 != ACCESS (cnffile, R_OK)) || (!S_ISREG (st.st_mode)))
228 if (configured == GNUNET_YES)
229 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
230 _("Could not access file `%s': %s\n"), cnffile,
232 GNUNET_free (cnffile);
240 * Free a prepared statement.
242 * @param plugin plugin context
243 * @param s prepared statement
246 prepared_statement_destroy (struct Plugin *plugin,
247 struct GNUNET_MysqlStatementHandle *s)
249 GNUNET_CONTAINER_DLL_remove (plugin->shead, plugin->stail, s);
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 while (NULL != plugin->shead)
265 prepared_statement_destroy (plugin, plugin->shead);
266 if (plugin->dbf != NULL)
268 mysql_close (plugin->dbf);
276 * Open the connection with the database (and initialize
277 * our default options).
279 * @return GNUNET_OK on success
282 iopen (struct Plugin *ret)
287 char *mysql_password;
288 unsigned long long mysql_port;
290 unsigned int timeout;
292 ret->dbf = mysql_init (NULL);
293 if (ret->dbf == NULL)
294 return GNUNET_SYSERR;
295 if (ret->cnffile != NULL)
296 mysql_options (ret->dbf, MYSQL_READ_DEFAULT_FILE, ret->cnffile);
297 mysql_options (ret->dbf, MYSQL_READ_DEFAULT_GROUP, "client");
299 mysql_options (ret->dbf, MYSQL_OPT_RECONNECT, &reconnect);
300 mysql_options (ret->dbf, MYSQL_OPT_CONNECT_TIMEOUT, (const void *) &timeout);
301 mysql_options (ret->dbf, MYSQL_SET_CHARSET_NAME, "UTF8");
302 timeout = 60; /* in seconds */
303 mysql_options (ret->dbf, MYSQL_OPT_READ_TIMEOUT, (const void *) &timeout);
304 mysql_options (ret->dbf, MYSQL_OPT_WRITE_TIMEOUT, (const void *) &timeout);
306 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
309 GNUNET_assert (GNUNET_OK ==
310 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
315 mysql_dbname = GNUNET_strdup ("gnunet");
317 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
318 "datacache-mysql", "USER"))
320 GNUNET_assert (GNUNET_OK ==
321 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
323 "USER", &mysql_user));
325 mysql_password = NULL;
326 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
330 GNUNET_assert (GNUNET_OK ==
331 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
337 if (GNUNET_YES == GNUNET_CONFIGURATION_have_value (ret->env->cfg,
338 "datacache-mysql", "HOST"))
340 GNUNET_assert (GNUNET_OK ==
341 GNUNET_CONFIGURATION_get_value_string (ret->env->cfg,
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,
353 "PORT", &mysql_port));
356 GNUNET_assert (mysql_dbname != NULL);
357 mysql_real_connect (ret->dbf, mysql_server, mysql_user, mysql_password,
358 mysql_dbname, (unsigned int) mysql_port, NULL,
359 CLIENT_IGNORE_SIGPIPE);
360 GNUNET_free_non_null (mysql_server);
361 GNUNET_free_non_null (mysql_user);
362 GNUNET_free_non_null (mysql_password);
363 GNUNET_free (mysql_dbname);
364 if (mysql_error (ret->dbf)[0])
366 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR, "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, const char *statement)
381 if ((NULL == plugin->dbf) && (GNUNET_OK != iopen (plugin)))
382 return GNUNET_SYSERR;
383 mysql_query (plugin->dbf, statement);
384 if (mysql_error (plugin->dbf)[0])
386 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR, "mysql_query", plugin);
388 return GNUNET_SYSERR;
394 * Create a prepared statement.
396 * @return NULL on error
398 static struct GNUNET_MysqlStatementHandle *
399 prepared_statement_create (struct Plugin *plugin, const char *statement)
401 struct GNUNET_MysqlStatementHandle *ret;
403 ret = GNUNET_malloc (sizeof (struct GNUNET_MysqlStatementHandle));
404 ret->query = GNUNET_strdup (statement);
405 GNUNET_CONTAINER_DLL_insert (plugin->shead, plugin->stail, ret);
411 * Prepare a statement for running.
413 * @return GNUNET_OK on success
416 prepare_statement (struct Plugin *plugin,
417 struct GNUNET_MysqlStatementHandle *ret)
419 if (GNUNET_YES == ret->valid)
421 if ((NULL == plugin->dbf) && (GNUNET_OK != iopen (plugin)))
422 return GNUNET_SYSERR;
423 ret->statement = mysql_stmt_init (plugin->dbf);
424 if (ret->statement == NULL)
427 return GNUNET_SYSERR;
429 if (mysql_stmt_prepare (ret->statement, ret->query, strlen (ret->query)))
431 LOG_MYSQL (GNUNET_ERROR_TYPE_ERROR, "mysql_stmt_prepare", plugin);
432 mysql_stmt_close (ret->statement);
433 ret->statement = NULL;
435 return GNUNET_SYSERR;
437 ret->valid = GNUNET_YES;
444 * Bind the parameters for the given MySQL statement
447 * @param plugin plugin context
448 * @param s statement to bind and run
449 * @param ap arguments for the binding
450 * @return GNUNET_SYSERR on error, GNUNET_OK on success
453 init_params (struct Plugin *plugin,
454 struct GNUNET_MysqlStatementHandle *s, va_list ap)
456 MYSQL_BIND qbind[MAX_PARAM];
459 enum enum_field_types ft;
461 pc = mysql_stmt_param_count (s->statement);
464 /* increase internal constant! */
466 return GNUNET_SYSERR;
468 memset (qbind, 0, sizeof (qbind));
471 while ((pc > 0) && (-1 != (int) (ft = va_arg (ap, enum enum_field_types))))
473 qbind[off].buffer_type = ft;
476 case MYSQL_TYPE_FLOAT:
477 qbind[off].buffer = va_arg (ap, float *);
480 case MYSQL_TYPE_LONGLONG:
481 qbind[off].buffer = va_arg (ap, unsigned long long *);
482 qbind[off].is_unsigned = va_arg (ap, int);
485 case MYSQL_TYPE_LONG:
486 qbind[off].buffer = va_arg (ap, unsigned int *);
487 qbind[off].is_unsigned = va_arg (ap, int);
490 case MYSQL_TYPE_VAR_STRING:
491 case MYSQL_TYPE_STRING:
492 case MYSQL_TYPE_BLOB:
493 qbind[off].buffer = va_arg (ap, void *);
494 qbind[off].buffer_length = va_arg (ap, unsigned long);
495 qbind[off].length = va_arg (ap, unsigned long *);
499 /* unsupported type */
501 return GNUNET_SYSERR;
506 if (!((pc == 0) && (-1 != (int) ft) && (va_arg (ap, int) == -1)))
509 return GNUNET_SYSERR;
511 if (mysql_stmt_bind_param (s->statement, qbind))
513 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
514 _("`%s' failed at %s:%d with error: %s\n"),
515 "mysql_stmt_bind_param",
516 __FILE__, __LINE__, mysql_stmt_error (s->statement));
518 return GNUNET_SYSERR;
520 if (mysql_stmt_execute (s->statement))
522 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
523 _("`%s' failed at %s:%d with error: %s\n"),
524 "mysql_stmt_execute",
525 __FILE__, __LINE__, mysql_stmt_error (s->statement));
527 return GNUNET_SYSERR;
533 * Type of a callback that will be called for each
534 * data set returned from MySQL.
536 * @param cls user-defined argument
537 * @param num_values number of elements in values
538 * @param values values returned by MySQL
539 * @return GNUNET_OK to continue iterating, GNUNET_SYSERR to abort
541 typedef int (*GNUNET_MysqlDataProcessor) (void *cls,
542 unsigned int num_values,
543 MYSQL_BIND * values);
547 * Run a prepared SELECT statement.
549 * @param plugin plugin context
550 * @param s handle to SELECT statment
551 * @param result_size number of elements in results array
552 * @param results pointer to already initialized MYSQL_BIND
553 * array (of sufficient size) for passing results
554 * @param processor function to call on each result
555 * @param processor_cls extra argument to processor
556 * @param ... pairs and triplets of "MYSQL_TYPE_XXX" keys and their respective
557 * values (size + buffer-reference for pointers); terminated
559 * @return GNUNET_SYSERR on error, otherwise
560 * the number of successfully affected (or queried) rows
563 prepared_statement_run_select (struct Plugin *plugin,
564 struct GNUNET_MysqlStatementHandle
566 unsigned int result_size,
567 MYSQL_BIND * results,
568 GNUNET_MysqlDataProcessor
569 processor, void *processor_cls, ...)
576 if (GNUNET_OK != prepare_statement (plugin, s))
579 return GNUNET_SYSERR;
581 va_start (ap, processor_cls);
582 if (GNUNET_OK != init_params (plugin, s, ap))
586 return GNUNET_SYSERR;
589 rsize = mysql_stmt_field_count (s->statement);
590 if (rsize > result_size)
593 return GNUNET_SYSERR;
595 if (mysql_stmt_bind_result (s->statement, results))
597 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
598 _("`%s' failed at %s:%d with error: %s\n"),
599 "mysql_stmt_bind_result",
600 __FILE__, __LINE__, mysql_stmt_error (s->statement));
602 return GNUNET_SYSERR;
608 ret = mysql_stmt_fetch (s->statement);
609 if (ret == MYSQL_NO_DATA)
613 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
614 _("`%s' failed at %s:%d with error: %s\n"),
616 __FILE__, __LINE__, mysql_stmt_error (s->statement));
618 return GNUNET_SYSERR;
620 if (processor != NULL)
621 if (GNUNET_OK != processor (processor_cls, rsize, results))
625 mysql_stmt_reset (s->statement);
632 * Run a prepared statement that does NOT produce results.
634 * @param plugin plugin context
635 * @param s handle to SELECT statment
636 * @param ... pairs and triplets of "MYSQL_TYPE_XXX" keys and their respective
637 * values (size + buffer-reference for pointers); terminated
639 * @param insert_id NULL or address where to store the row ID of whatever
640 * was inserted (only for INSERT statements!)
641 * @return GNUNET_SYSERR on error, otherwise
642 * the number of successfully affected rows
645 prepared_statement_run (struct Plugin *plugin,
646 struct GNUNET_MysqlStatementHandle *s,
647 unsigned long long *insert_id, ...)
652 if (GNUNET_OK != prepare_statement (plugin, s))
653 return GNUNET_SYSERR;
654 va_start (ap, insert_id);
655 if (GNUNET_OK != init_params (plugin, s, ap))
658 return GNUNET_SYSERR;
661 affected = mysql_stmt_affected_rows (s->statement);
662 if (NULL != insert_id)
663 *insert_id = (unsigned long long) mysql_stmt_insert_id (s->statement);
664 mysql_stmt_reset (s->statement);
670 * Create temporary table and prepare statements.
672 * @param plugin plugin context
673 * @return GNUNET_OK on success
676 itable (struct Plugin *plugin)
678 #define MRUNS(a) (GNUNET_OK != run_statement (plugin, a) )
679 if (MRUNS ("CREATE TEMPORARY TABLE gn080dstore ("
680 " type INT(11) UNSIGNED NOT NULL DEFAULT 0,"
681 " puttime BIGINT UNSIGNED NOT NULL DEFAULT 0,"
682 " expire BIGINT UNSIGNED NOT NULL DEFAULT 0,"
683 " hash BINARY(64) NOT NULL DEFAULT '',"
684 " vhash BINARY(64) NOT NULL DEFAULT '',"
685 " value BLOB NOT NULL DEFAULT '',"
686 " INDEX hashidx (hash(64),type,expire),"
687 " INDEX allidx (hash(64),vhash(64),type),"
688 " INDEX expireidx (puttime)" ") ENGINE=InnoDB") ||
689 MRUNS ("SET AUTOCOMMIT = 1"))
690 return GNUNET_SYSERR;
692 #define PINIT(a,b) (NULL == (a = prepared_statement_create(plugin, b)))
693 if (PINIT (plugin->select_value, SELECT_VALUE_STMT) ||
694 PINIT (plugin->count_value, COUNT_VALUE_STMT) ||
695 PINIT (plugin->select_old_value, SELECT_OLD_VALUE_STMT) ||
696 PINIT (plugin->delete_value, DELETE_VALUE_STMT) ||
697 PINIT (plugin->insert_value, INSERT_VALUE_STMT) ||
698 PINIT (plugin->update_value, UPDATE_VALUE_STMT))
699 return GNUNET_SYSERR;
706 * Store an item in the datastore.
708 * @param cls closure (our "struct Plugin")
709 * @param key key to store data under
710 * @param size number of bytes in data
711 * @param data data to store
712 * @param type type of the value
713 * @param discard_time when to discard the value in any case
714 * @return 0 on error, number of bytes used otherwise
717 mysql_plugin_put (void *cls,
718 const GNUNET_HashCode * key,
721 enum GNUNET_BLOCK_Type type,
722 struct GNUNET_TIME_Absolute discard_time)
724 struct Plugin *plugin = cls;
725 struct GNUNET_TIME_Absolute now;
726 unsigned long k_length;
727 unsigned long h_length;
728 unsigned long v_length;
729 unsigned long long v_now;
730 unsigned long long v_discard_time;
732 GNUNET_HashCode vhash;
735 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
736 return GNUNET_SYSERR;
737 GNUNET_CRYPTO_hash (data, size, &vhash);
738 now = GNUNET_TIME_absolute_get ();
740 /* first try UPDATE */
741 h_length = sizeof (GNUNET_HashCode);
742 k_length = sizeof (GNUNET_HashCode);
745 v_now = (unsigned long long) now.abs_value;
746 v_discard_time = (unsigned long long) discard_time.abs_value;
748 prepared_statement_run (plugin,
749 plugin->update_value,
759 sizeof (GNUNET_HashCode),
763 sizeof (GNUNET_HashCode),
765 MYSQL_TYPE_LONG, &v_type, GNUNET_YES, -1))
769 h_length = sizeof (GNUNET_HashCode);
770 k_length = sizeof (GNUNET_HashCode);
773 (ret = prepared_statement_run (plugin,
774 plugin->insert_value,
787 sizeof (GNUNET_HashCode),
791 sizeof (GNUNET_HashCode),
795 (unsigned long) size, &v_length, -1)))
797 if (ret == GNUNET_SYSERR)
799 return GNUNET_SYSERR;
801 return size + OVERHEAD;
806 return_ok (void *cls, unsigned int num_values, MYSQL_BIND * values)
813 * Iterate over the results for a particular key
816 * @param cls closure (our "struct Plugin")
818 * @param type entries of which type are relevant?
819 * @param iter maybe NULL (to just count)
820 * @param iter_cls closure for iter
821 * @return the number of results found
824 mysql_plugin_get (void *cls,
825 const GNUNET_HashCode * key,
826 enum GNUNET_BLOCK_Type type,
827 GNUNET_DATACACHE_Iterator iter, void *iter_cls)
829 struct Plugin *plugin = cls;
831 unsigned long h_length;
832 unsigned long v_length;
833 unsigned long long v_expire;
834 struct GNUNET_TIME_Absolute now;
835 struct GNUNET_TIME_Absolute expire;
837 unsigned long long total;
838 unsigned long long v_now;
842 char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
844 now = GNUNET_TIME_absolute_get ();
845 h_length = sizeof (GNUNET_HashCode);
846 v_length = sizeof (buffer);
848 memset (rbind, 0, sizeof (rbind));
849 rbind[0].buffer_type = MYSQL_TYPE_LONGLONG;
850 rbind[0].buffer = &total;
851 rbind[0].is_unsigned = GNUNET_YES;
853 v_now = (unsigned long long) now.abs_value;
855 (ret = prepared_statement_run_select (plugin,
870 -1))) || (-1 == total))
872 if (ret == GNUNET_SYSERR)
874 return GNUNET_SYSERR;
876 if ((iter == NULL) || (total == 0))
879 off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, total);
883 memset (rbind, 0, sizeof (rbind));
884 rbind[0].buffer_type = MYSQL_TYPE_BLOB;
885 rbind[0].buffer_length = sizeof (buffer);
886 rbind[0].length = &v_length;
887 rbind[0].buffer = buffer;
888 rbind[1].buffer_type = MYSQL_TYPE_LONGLONG;
889 rbind[1].is_unsigned = 1;
890 rbind[1].buffer = &v_expire;
891 off = (off + 1) % total;
893 (ret = prepared_statement_run_select (plugin,
894 plugin->select_value,
911 &off, GNUNET_YES, -1)))
913 if (ret == GNUNET_SYSERR)
915 return GNUNET_SYSERR;
918 expire.abs_value = v_expire;
919 if (GNUNET_OK != iter (iter_cls, expire, key, v_length, buffer, type))
927 * Delete the entry with the lowest expiration value
928 * from the datacache right now.
930 * @param cls closure (our "struct Plugin")
931 * @return GNUNET_OK on success, GNUNET_SYSERR on error
934 mysql_plugin_del (void *cls)
936 struct Plugin *plugin = cls;
940 GNUNET_HashCode v_key;
941 GNUNET_HashCode vhash;
942 unsigned long k_length;
943 unsigned long h_length;
944 unsigned long v_length;
946 char buffer[GNUNET_SERVER_MAX_MESSAGE_SIZE];
948 k_length = sizeof (GNUNET_HashCode);
949 h_length = sizeof (GNUNET_HashCode);
950 v_length = sizeof (buffer);
951 memset (rbind, 0, sizeof (rbind));
952 rbind[0].buffer_type = MYSQL_TYPE_BLOB;
953 rbind[0].buffer_length = sizeof (GNUNET_HashCode);
954 rbind[0].length = &k_length;
955 rbind[0].buffer = &v_key;
956 rbind[1].buffer_type = MYSQL_TYPE_BLOB;
957 rbind[1].buffer_length = sizeof (GNUNET_HashCode);
958 rbind[1].length = &h_length;
959 rbind[1].buffer = &vhash;
960 rbind[2].buffer_type = MYSQL_TYPE_LONG;
961 rbind[2].is_unsigned = 1;
962 rbind[2].buffer = &v_type;
963 rbind[3].buffer_type = MYSQL_TYPE_BLOB;
964 rbind[3].buffer_length = sizeof (buffer);
965 rbind[3].length = &v_length;
966 rbind[3].buffer = buffer;
968 (ret = prepared_statement_run_select (plugin,
969 plugin->select_old_value,
976 (ret = prepared_statement_run (plugin,
977 plugin->delete_value,
981 sizeof (GNUNET_HashCode),
985 sizeof (GNUNET_HashCode),
993 sizeof (buffer), &v_length, -1))))
995 if (ret == GNUNET_SYSERR)
997 return GNUNET_SYSERR;
999 plugin->env->delete_notify (plugin->env->cls, &v_key, v_length + OVERHEAD);
1006 * Entry point for the plugin.
1008 * @param cls closure (the "struct GNUNET_DATACACHE_PluginEnvironmnet")
1009 * @return the plugin's closure (our "struct Plugin")
1012 libgnunet_plugin_datacache_mysql_init (void *cls)
1014 struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
1015 struct GNUNET_DATACACHE_PluginFunctions *api;
1016 struct Plugin *plugin;
1018 plugin = GNUNET_malloc (sizeof (struct Plugin));
1020 plugin->cnffile = get_my_cnf_path (env->cfg);
1021 if (GNUNET_OK != iopen (plugin))
1023 GNUNET_free_non_null (plugin->cnffile);
1024 GNUNET_free (plugin);
1027 if (GNUNET_OK != itable (plugin))
1030 GNUNET_free_non_null (plugin->cnffile);
1031 GNUNET_free (plugin);
1034 api = GNUNET_malloc (sizeof (struct GNUNET_DATACACHE_PluginFunctions));
1036 api->get = &mysql_plugin_get;
1037 api->put = &mysql_plugin_put;
1038 api->del = &mysql_plugin_del;
1039 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1040 "mysql", _("MySQL datacache running\n"));
1046 * Exit point from the plugin.
1048 * @param cls closure (our "struct Plugin")
1052 libgnunet_plugin_datacache_mysql_done (void *cls)
1054 struct GNUNET_DATACACHE_PluginFunctions *api = cls;
1055 struct Plugin *plugin = api->cls;
1058 GNUNET_free_non_null (plugin->cnffile);
1059 GNUNET_free (plugin);
1061 mysql_library_end ();
1066 /* end of plugin_datacache_mysql.c */