2 This file is part of GNUnet
3 (C) 2006, 2009 Christian Grothoff (and other contributing authors)
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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
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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 LOG(kind,...) GNUNET_log_from (kind, "datacache-sqlite", __VA_ARGS__)
33 #define LOG_STRERROR_FILE(kind,op,fn) GNUNET_log_from_strerror_file (kind, "datacache-sqlite", op, fn)
37 * How much overhead do we assume per entry in the
40 #define OVERHEAD (sizeof(struct GNUNET_HashCode) + 32)
43 * Context for all functions in this plugin.
48 * Our execution environment.
50 struct GNUNET_DATACACHE_PluginEnvironment *env;
53 * Handle to the sqlite database.
58 * Filename used for the DB.
65 * Log an error message at log-level 'level' that indicates
66 * a failure of the command 'cmd' on file 'filename'
67 * with the message given by strerror(errno).
69 #define LOG_SQLITE(db, level, cmd) do { LOG (level, _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, sqlite3_errmsg(db)); } while(0)
72 #define SQLITE3_EXEC(db, cmd) do { emsg = NULL; if (SQLITE_OK != sqlite3_exec(db, cmd, NULL, NULL, &emsg)) { 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)
76 * @brief Prepare a SQL statement
79 sq_prepare (sqlite3 * dbh, const char *zSql, /* SQL statement, UTF-8 encoded */
80 sqlite3_stmt ** ppStmt)
81 { /* OUT: Statement handle */
84 return sqlite3_prepare (dbh, zSql, strlen (zSql), ppStmt,
85 (const char **) &dummy);
90 * Store an item in the datastore.
92 * @param cls closure (our "struct Plugin")
93 * @param key key to store data under
94 * @param size number of bytes in data
95 * @param data data to store
96 * @param type type of the value
97 * @param discard_time when to discard the value in any case
98 * @return 0 on error, number of bytes used otherwise
101 sqlite_plugin_put (void *cls, const struct GNUNET_HashCode * key, size_t size,
102 const char *data, enum GNUNET_BLOCK_Type type,
103 struct GNUNET_TIME_Absolute discard_time)
105 struct Plugin *plugin = cls;
109 LOG (GNUNET_ERROR_TYPE_DEBUG,
110 "Processing `%s' of %u bytes with key `%4s' and expiration %s\n",
111 "PUT", (unsigned int) size, GNUNET_h2s (key),
113 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (discard_time), GNUNET_YES));
114 dval = (int64_t) discard_time.abs_value;
119 "INSERT INTO ds090 (type, expire, key, value) VALUES (?, ?, ?, ?)",
122 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
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 (struct 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 struct 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 LOG (GNUNET_ERROR_TYPE_DEBUG, "Processing `%s' for key `%4s'\n", "GET",
185 "SELECT count(*) FROM ds090 WHERE key=? AND type=? AND expire >= ?",
188 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
192 ntime = (int64_t) now.abs_value;
193 GNUNET_assert (ntime >= 0);
195 sqlite3_bind_blob (stmt, 1, key, sizeof (struct GNUNET_HashCode),
196 SQLITE_TRANSIENT)) ||
197 (SQLITE_OK != sqlite3_bind_int (stmt, 2, type)) ||
198 (SQLITE_OK != sqlite3_bind_int64 (stmt, 3, now.abs_value)))
200 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
202 sqlite3_finalize (stmt);
206 if (SQLITE_ROW != sqlite3_step (stmt))
208 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
210 sqlite3_finalize (stmt);
211 LOG (GNUNET_ERROR_TYPE_DEBUG,
212 "No content found when processing `%s' for key `%4s'\n", "GET",
216 total = sqlite3_column_int (stmt, 0);
217 sqlite3_finalize (stmt);
218 if ((total == 0) || (iter == NULL))
221 LOG (GNUNET_ERROR_TYPE_DEBUG,
222 "No content found when processing `%s' for key `%4s'\n", "GET",
228 off = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, total);
231 off = (off + 1) % total;
232 GNUNET_snprintf (scratch, sizeof (scratch),
233 "SELECT value,expire FROM ds090 WHERE key=? AND type=? AND expire >= ? LIMIT 1 OFFSET %u",
235 if (sq_prepare (plugin->dbh, scratch, &stmt) != SQLITE_OK)
237 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
242 sqlite3_bind_blob (stmt, 1, key, sizeof (struct GNUNET_HashCode),
243 SQLITE_TRANSIENT)) ||
244 (SQLITE_OK != sqlite3_bind_int (stmt, 2, type)) ||
245 (SQLITE_OK != sqlite3_bind_int64 (stmt, 3, now.abs_value)))
247 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
249 sqlite3_finalize (stmt);
252 if (sqlite3_step (stmt) != SQLITE_ROW)
254 size = sqlite3_column_bytes (stmt, 0);
255 dat = sqlite3_column_blob (stmt, 0);
256 exp.abs_value = sqlite3_column_int64 (stmt, 1);
257 ntime = (int64_t) exp.abs_value;
258 if (ntime == INT64_MAX)
259 exp = GNUNET_TIME_UNIT_FOREVER_ABS;
261 LOG (GNUNET_ERROR_TYPE_DEBUG,
262 "Found %u-byte result when processing `%s' for key `%4s'\n",
263 (unsigned int) size, "GET", GNUNET_h2s (key));
264 if (GNUNET_OK != iter (iter_cls, exp, key, size, dat, type))
266 sqlite3_finalize (stmt);
269 sqlite3_finalize (stmt);
276 * Delete the entry with the lowest expiration value
277 * from the datacache right now.
279 * @param cls closure (our "struct Plugin")
280 * @return GNUNET_OK on success, GNUNET_SYSERR on error
283 sqlite_plugin_del (void *cls)
285 struct Plugin *plugin = cls;
286 unsigned long long rowid;
290 struct GNUNET_HashCode hc;
292 LOG (GNUNET_ERROR_TYPE_DEBUG, "Processing `%s'\n", "DEL");
297 "SELECT _ROWID_,key,value FROM ds090 ORDER BY expire ASC LIMIT 1",
300 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
303 (void) sqlite3_finalize (stmt);
304 return GNUNET_SYSERR;
306 if (SQLITE_ROW != sqlite3_step (stmt))
308 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
310 (void) sqlite3_finalize (stmt);
311 return GNUNET_SYSERR;
313 rowid = sqlite3_column_int64 (stmt, 0);
314 GNUNET_assert (sqlite3_column_bytes (stmt, 1) == sizeof (struct GNUNET_HashCode));
315 memcpy (&hc, sqlite3_column_blob (stmt, 1), sizeof (struct GNUNET_HashCode));
316 dsize = sqlite3_column_bytes (stmt, 2);
317 if (SQLITE_OK != sqlite3_finalize (stmt))
318 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
320 if (sq_prepare (plugin->dbh, "DELETE FROM ds090 WHERE _ROWID_=?", &dstmt) !=
323 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
326 (void) sqlite3_finalize (stmt);
327 return GNUNET_SYSERR;
329 if (SQLITE_OK != sqlite3_bind_int64 (dstmt, 1, rowid))
331 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
333 (void) sqlite3_finalize (dstmt);
334 return GNUNET_SYSERR;
336 if (sqlite3_step (dstmt) != SQLITE_DONE)
338 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
340 (void) sqlite3_finalize (dstmt);
341 return GNUNET_SYSERR;
343 plugin->env->delete_notify (plugin->env->cls, &hc, dsize + OVERHEAD);
344 if (SQLITE_OK != sqlite3_finalize (dstmt))
345 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
352 * Entry point for the plugin.
354 * @param cls closure (the "struct GNUNET_DATACACHE_PluginEnvironmnet")
355 * @return the plugin's closure (our "struct Plugin")
358 libgnunet_plugin_datacache_sqlite_init (void *cls)
360 struct GNUNET_DATACACHE_PluginEnvironment *env = cls;
361 struct GNUNET_DATACACHE_PluginFunctions *api;
362 struct Plugin *plugin;
368 fn = GNUNET_DISK_mktemp ("gnunet-datacache");
375 fn_utf8 = GNUNET_STRINGS_to_utf8 (fn, strlen (fn), nl_langinfo (CODESET));
378 fn_utf8 = GNUNET_STRINGS_to_utf8 (fn, strlen (fn), "UTF-8");
380 if (SQLITE_OK != sqlite3_open (fn_utf8, &dbh))
383 GNUNET_free (fn_utf8);
388 SQLITE3_EXEC (dbh, "PRAGMA temp_store=MEMORY");
389 SQLITE3_EXEC (dbh, "PRAGMA locking_mode=EXCLUSIVE");
390 SQLITE3_EXEC (dbh, "PRAGMA journal_mode=OFF");
391 SQLITE3_EXEC (dbh, "PRAGMA synchronous=OFF");
392 SQLITE3_EXEC (dbh, "PRAGMA count_changes=OFF");
393 SQLITE3_EXEC (dbh, "PRAGMA page_size=4092");
395 "CREATE TABLE ds090 (" " type INTEGER NOT NULL DEFAULT 0,"
396 " expire INTEGER NOT NULL DEFAULT 0,"
397 " key BLOB NOT NULL DEFAULT '',"
398 " value BLOB NOT NULL DEFAULT '')");
399 SQLITE3_EXEC (dbh, "CREATE INDEX idx_hashidx ON ds090 (key,type,expire)");
400 SQLITE3_EXEC (dbh, "CREATE INDEX idx_expire ON ds090 (expire)");
401 plugin = GNUNET_malloc (sizeof (struct Plugin));
404 plugin->fn = fn_utf8;
405 api = GNUNET_malloc (sizeof (struct GNUNET_DATACACHE_PluginFunctions));
407 api->get = &sqlite_plugin_get;
408 api->put = &sqlite_plugin_put;
409 api->del = &sqlite_plugin_del;
410 LOG (GNUNET_ERROR_TYPE_INFO, _("Sqlite datacache running\n"));
416 * Exit point from the plugin.
418 * @param cls closure (our "struct Plugin")
422 libgnunet_plugin_datacache_sqlite_done (void *cls)
424 struct GNUNET_DATACACHE_PluginFunctions *api = cls;
425 struct Plugin *plugin = api->cls;
428 #if SQLITE_VERSION_NUMBER >= 3007000
432 #if !WINDOWS || defined(__CYGWIN__)
433 if (0 != UNLINK (plugin->fn))
434 LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "unlink", plugin->fn);
435 GNUNET_free (plugin->fn);
437 result = sqlite3_close (plugin->dbh);
438 #if SQLITE_VERSION_NUMBER >= 3007000
439 if (result == SQLITE_BUSY)
441 LOG (GNUNET_ERROR_TYPE_WARNING,
443 ("Tried to close sqlite without finalizing all prepared statements.\n"));
444 stmt = sqlite3_next_stmt (plugin->dbh, NULL);
447 LOG (GNUNET_ERROR_TYPE_DEBUG, "Closing statement %p\n", stmt);
448 result = sqlite3_finalize (stmt);
449 if (result != SQLITE_OK)
450 LOG (GNUNET_ERROR_TYPE_WARNING, _("Failed to close statement %p: %d\n"),
452 stmt = sqlite3_next_stmt (plugin->dbh, NULL);
454 result = sqlite3_close (plugin->dbh);
457 if (SQLITE_OK != result)
458 LOG_SQLITE (plugin->dbh, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
460 #if WINDOWS && !defined(__CYGWIN__)
461 if (0 != UNLINK (plugin->fn))
462 LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "unlink", plugin->fn);
463 GNUNET_free (plugin->fn);
465 GNUNET_free (plugin);
472 /* end of plugin_datacache_sqlite.c */