2 This file is part of GNUnet
3 (C) 2006, 2009 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_sqlite.c
23 * @brief sqlite for an implementation of a database backend for the datacache
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_datacache_plugin.h"
31 #define DEBUG_DATACACHE_SQLITE GNUNET_NO
34 * How much overhead do we assume per entry in the
37 #define OVERHEAD (sizeof(GNUNET_HashCode) + 32)
40 * Context for all functions in this plugin.
45 * Our execution environment.
47 struct GNUNET_DATACACHE_PluginEnvironment *env;
50 * Handle to the sqlite database.
55 * Filename used for the DB.
62 * Log an error message at log-level 'level' that indicates
63 * a failure of the command 'cmd' on file 'filename'
64 * with the message given by strerror(errno).
66 #define LOG_SQLITE(db, level, cmd) do { GNUNET_log(level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, sqlite3_errmsg(db)); } while(0)
69 #define SQLITE3_EXEC(db, cmd) do { emsg = NULL; if (SQLITE_OK != sqlite3_exec(db, cmd, NULL, NULL, &emsg)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK, _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_exec", __FILE__, __LINE__, emsg); sqlite3_free(emsg); } } while(0)
73 * @brief Prepare a SQL statement
76 sq_prepare (sqlite3 * dbh, const char *zSql, /* SQL statement, UTF-8 encoded */
77 sqlite3_stmt ** ppStmt)
78 { /* OUT: Statement handle */
81 return sqlite3_prepare (dbh, zSql, strlen (zSql), ppStmt,
82 (const char **) &dummy);
87 * Store an item in the datastore.
89 * @param cls closure (our "struct Plugin")
90 * @param key key to store data under
91 * @param size number of bytes in data
92 * @param data data to store
93 * @param type type of the value
94 * @param discard_time when to discard the value in any case
95 * @return 0 on error, number of bytes used otherwise
98 sqlite_plugin_put (void *cls, const GNUNET_HashCode * key, size_t size,
99 const char *data, enum GNUNET_BLOCK_Type type,
100 struct GNUNET_TIME_Absolute discard_time)
102 struct Plugin *plugin = cls;
106 #if DEBUG_DATACACHE_SQLITE
107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
108 "Processing `%s' of %u bytes with key `%4s' and expiration %llums\n",
109 "PUT", (unsigned int) size, GNUNET_h2s (key),
111 GNUNET_TIME_absolute_get_remaining (discard_time).rel_value);
113 dval = (int64_t) discard_time.abs_value;
118 "INSERT INTO ds090 " "(type, expire, key, value) " "VALUES (?, ?, ?, ?)",
121 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
122 _("`%s' failed at %s:%d with error: %s\n"), "sq_prepare",
123 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
126 if ((SQLITE_OK != sqlite3_bind_int (stmt, 1, type)) ||
127 (SQLITE_OK != sqlite3_bind_int64 (stmt, 2, dval)) ||
129 sqlite3_bind_blob (stmt, 3, key, sizeof (GNUNET_HashCode),
130 SQLITE_TRANSIENT)) ||
131 (SQLITE_OK != sqlite3_bind_blob (stmt, 4, data, size, SQLITE_TRANSIENT)))
133 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
135 sqlite3_finalize (stmt);
138 if (SQLITE_DONE != sqlite3_step (stmt))
140 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
142 sqlite3_finalize (stmt);
145 if (SQLITE_OK != sqlite3_finalize (stmt))
146 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
148 return size + OVERHEAD;
153 * Iterate over the results for a particular key
156 * @param cls closure (our "struct Plugin")
158 * @param type entries of which type are relevant?
159 * @param iter maybe NULL (to just count)
160 * @param iter_cls closure for iter
161 * @return the number of results found
164 sqlite_plugin_get (void *cls, const GNUNET_HashCode * key,
165 enum GNUNET_BLOCK_Type type, GNUNET_DATACACHE_Iterator iter,
168 struct Plugin *plugin = cls;
170 struct GNUNET_TIME_Absolute now;
171 struct GNUNET_TIME_Absolute exp;
180 now = GNUNET_TIME_absolute_get ();
181 #if DEBUG_DATACACHE_SQLITE
182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing `%s' for key `%4s'\n", "GET",
187 "SELECT count(*) FROM ds090 WHERE key=? AND type=? AND expire >= ?",
190 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
191 _("`%s' failed at %s:%d with error: %s\n"), "sq_prepare",
192 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
195 ntime = (int64_t) now.abs_value;
196 GNUNET_assert (ntime >= 0);
198 sqlite3_bind_blob (stmt, 1, key, sizeof (GNUNET_HashCode),
199 SQLITE_TRANSIENT)) ||
200 (SQLITE_OK != sqlite3_bind_int (stmt, 2, type)) ||
201 (SQLITE_OK != sqlite3_bind_int64 (stmt, 3, now.abs_value)))
203 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
205 sqlite3_finalize (stmt);
209 if (SQLITE_ROW != sqlite3_step (stmt))
211 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
213 sqlite3_finalize (stmt);
216 total = sqlite3_column_int (stmt, 0);
217 sqlite3_finalize (stmt);
218 if ((total == 0) || (iter == NULL))
222 off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, total);
225 off = (off + 1) % total;
226 GNUNET_snprintf (scratch, sizeof (scratch),
227 "SELECT value,expire FROM ds090 WHERE key=? AND type=? AND expire >= ? LIMIT 1 OFFSET %u",
229 if (sq_prepare (plugin->dbh, scratch, &stmt) != SQLITE_OK)
231 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
232 _("`%s' failed at %s:%d with error: %s\n"), "sq_prepare",
233 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
237 sqlite3_bind_blob (stmt, 1, key, sizeof (GNUNET_HashCode),
238 SQLITE_TRANSIENT)) ||
239 (SQLITE_OK != sqlite3_bind_int (stmt, 2, type)) ||
240 (SQLITE_OK != sqlite3_bind_int64 (stmt, 3, now.abs_value)))
242 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
244 sqlite3_finalize (stmt);
247 if (sqlite3_step (stmt) != SQLITE_ROW)
249 size = sqlite3_column_bytes (stmt, 0);
250 dat = sqlite3_column_blob (stmt, 0);
251 exp.abs_value = sqlite3_column_int64 (stmt, 1);
252 ntime = (int64_t) exp.abs_value;
253 if (ntime == INT64_MAX)
254 exp = GNUNET_TIME_UNIT_FOREVER_ABS;
256 if (GNUNET_OK != iter (iter_cls, exp, key, size, dat, type))
258 sqlite3_finalize (stmt);
261 sqlite3_finalize (stmt);
268 * Delete the entry with the lowest expiration value
269 * from the datacache right now.
271 * @param cls closure (our "struct Plugin")
272 * @return GNUNET_OK on success, GNUNET_SYSERR on error
275 sqlite_plugin_del (void *cls)
277 struct Plugin *plugin = cls;
285 #if DEBUG_DATACACHE_SQLITE
286 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Processing `%s'\n", "DEL");
292 "SELECT type, key, value FROM ds090 ORDER BY expire ASC LIMIT 1",
295 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
296 _("`%s' failed at %s:%d with error: %s\n"), "sq_prepare",
297 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
299 (void) sqlite3_finalize (stmt);
300 return GNUNET_SYSERR;
302 if (SQLITE_ROW != sqlite3_step (stmt))
304 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
305 _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_step",
306 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
307 (void) sqlite3_finalize (stmt);
308 return GNUNET_SYSERR;
310 dtype = sqlite3_column_int (stmt, 0);
311 GNUNET_break (sqlite3_column_bytes (stmt, 1) == sizeof (GNUNET_HashCode));
312 dsize = sqlite3_column_bytes (stmt, 2);
313 GNUNET_assert (dsize <= sizeof (blob));
314 memcpy (blob, sqlite3_column_blob (stmt, 2), dsize);
315 memcpy (&hc, sqlite3_column_blob (stmt, 1), sizeof (GNUNET_HashCode));
316 if (SQLITE_OK != sqlite3_finalize (stmt))
317 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
318 _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_step",
319 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
321 (plugin->dbh, "DELETE FROM ds090 " "WHERE key=? AND value=? AND type=?",
322 &dstmt) != SQLITE_OK)
324 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
325 _("`%s' failed at %s:%d with error: %s\n"), "sq_prepare",
326 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
328 (void) sqlite3_finalize (stmt);
329 return GNUNET_SYSERR;
332 sqlite3_bind_blob (dstmt, 1, &hc, sizeof (GNUNET_HashCode),
333 SQLITE_TRANSIENT)) ||
334 (SQLITE_OK != sqlite3_bind_blob (dstmt, 2, blob, dsize, SQLITE_TRANSIENT))
335 || (SQLITE_OK != sqlite3_bind_int (dstmt, 3, dtype)))
337 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
338 _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_bind",
339 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
340 (void) sqlite3_finalize (dstmt);
341 return GNUNET_SYSERR;
343 if (sqlite3_step (dstmt) != SQLITE_DONE)
345 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
346 _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_step",
347 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
348 (void) sqlite3_finalize (dstmt);
349 return GNUNET_SYSERR;
351 plugin->env->delete_notify (plugin->env->cls, &hc, dsize + OVERHEAD);
352 if (SQLITE_OK != sqlite3_finalize (dstmt))
353 GNUNET_log (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
354 _("`%s' failed at %s:%d with error: %s\n"), "sqlite3_finalize",
355 __FILE__, __LINE__, sqlite3_errmsg (plugin->dbh));
361 * Entry point for the plugin.
363 * @param cls closure (the "struct GNUNET_DATACACHE_PluginEnvironmnet")
364 * @return the plugin's closure (our "struct Plugin")
367 libgnunet_plugin_datacache_sqlite_init (void *cls)
369 struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
370 struct GNUNET_DATACACHE_PluginFunctions *api;
371 struct Plugin *plugin;
377 fn = GNUNET_DISK_mktemp ("gnunet-datacache");
384 fn_utf8 = GNUNET_STRINGS_to_utf8 (fn, strlen (fn), nl_langinfo (CODESET));
387 fn_utf8 = GNUNET_STRINGS_to_utf8 (fn, strlen (fn), "UTF-8");
389 if (SQLITE_OK != sqlite3_open (fn_utf8, &dbh))
392 GNUNET_free (fn_utf8);
397 SQLITE3_EXEC (dbh, "PRAGMA temp_store=MEMORY");
398 SQLITE3_EXEC (dbh, "PRAGMA locking_mode=EXCLUSIVE");
399 SQLITE3_EXEC (dbh, "PRAGMA journal_mode=OFF");
400 SQLITE3_EXEC (dbh, "PRAGMA synchronous=OFF");
401 SQLITE3_EXEC (dbh, "PRAGMA count_changes=OFF");
402 SQLITE3_EXEC (dbh, "PRAGMA page_size=4092");
404 "CREATE TABLE ds090 (" " type INTEGER NOT NULL DEFAULT 0,"
405 " expire INTEGER NOT NULL DEFAULT 0,"
406 " key BLOB NOT NULL DEFAULT '',"
407 " value BLOB NOT NULL DEFAULT '')");
408 SQLITE3_EXEC (dbh, "CREATE INDEX idx_hashidx ON ds090 (key,type,expire)");
409 plugin = GNUNET_malloc (sizeof (struct Plugin));
412 plugin->fn = fn_utf8;
413 api = GNUNET_malloc (sizeof (struct GNUNET_DATACACHE_PluginFunctions));
415 api->get = &sqlite_plugin_get;
416 api->put = &sqlite_plugin_put;
417 api->del = &sqlite_plugin_del;
418 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "sqlite",
419 _("Sqlite datacache running\n"));
423 // explain SELECT type FROM gn090 WHERE NOT EXISTS (SELECT 1 from gn090 WHERE expire < 42 LIMIT 1) OR expire < 42 ORDER BY repl DESC, Random() LIMIT 1;
427 * Exit point from the plugin.
429 * @param cls closure (our "struct Plugin")
433 libgnunet_plugin_datacache_sqlite_done (void *cls)
435 struct GNUNET_DATACACHE_PluginFunctions *api = cls;
436 struct Plugin *plugin = api->cls;
439 #if SQLITE_VERSION_NUMBER >= 3007000
443 #if !WINDOWS || defined(__CYGWIN__)
444 if (0 != UNLINK (plugin->fn))
445 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink", plugin->fn);
446 GNUNET_free (plugin->fn);
448 result = sqlite3_close (plugin->dbh);
449 #if SQLITE_VERSION_NUMBER >= 3007000
450 if (result == SQLITE_BUSY)
452 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "sqlite",
454 ("Tried to close sqlite without finalizing all prepared statements.\n"));
455 stmt = sqlite3_next_stmt (plugin->dbh, NULL);
459 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "sqlite",
460 "Closing statement %p\n", stmt);
462 result = sqlite3_finalize (stmt);
464 if (result != SQLITE_OK)
465 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "sqlite",
466 "Failed to close statement %p: %d\n", stmt, result);
468 stmt = sqlite3_next_stmt (plugin->dbh, NULL);
470 result = sqlite3_close (plugin->dbh);
473 if (SQLITE_OK != result)
474 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
476 #if WINDOWS && !defined(__CYGWIN__)
477 if (0 != UNLINK (plugin->fn))
478 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "unlink", plugin->fn);
479 GNUNET_free (plugin->fn);
481 GNUNET_free (plugin);
488 /* end of plugin_datacache_sqlite.c */