2 * This file is part of GNUnet
3 * (C) 2013 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 peerstore/plugin_peerstore_sqlite.c
23 * @brief sqlite-based peerstore backend
24 * @author Omar Tarabai
28 #include "gnunet_peerstore_plugin.h"
29 #include "gnunet_peerstore_service.h"
30 #include "peerstore.h"
34 * After how many ms "busy" should a DB operation fail for good? A
35 * low value makes sure that we are more responsive to requests
36 * (especially PUTs). A high value guarantees a higher success rate
37 * (SELECTs in iterate can take several seconds despite LIMIT=1).
39 * The default value of 1s should ensure that users do not experience
40 * huge latencies while at the same time allowing operations to
41 * succeed with reasonable probability.
43 #define BUSY_TIMEOUT_MS 1000
46 * Log an error message at log-level 'level' that indicates
47 * a failure of the command 'cmd' on file 'filename'
48 * with the message given by strerror(errno).
50 #define LOG_SQLITE(db, level, cmd) do { GNUNET_log_from (level, "peerstore-sqlite", _("`%s' failed at %s:%d with error: %s\n"), cmd, __FILE__, __LINE__, sqlite3_errmsg(db->dbh)); } while(0)
52 #define LOG(kind,...) GNUNET_log_from (kind, "peerstore-sqlite", __VA_ARGS__)
55 * Context for all functions in this plugin.
61 * Configuration handle
63 const struct GNUNET_CONFIGURATION_Handle *cfg;
71 * Native SQLite database handle.
76 * Precompiled SQL for inserting into peerstoredata
78 sqlite3_stmt *insert_peerstoredata;
81 * Precompiled SQL for selecting from peerstoredata
83 sqlite3_stmt *select_peerstoredata;
86 * Precompiled SQL for selecting from peerstoredata
88 sqlite3_stmt *select_peerstoredata_by_pid;
91 * Precompiled SQL for selecting from peerstoredata
93 sqlite3_stmt *select_peerstoredata_by_key;
96 * Precompiled SQL for selecting from peerstoredata
98 sqlite3_stmt *select_peerstoredata_by_all;
103 * Iterate over the records given an optional peer id
106 * @param cls closure (internal context for the plugin)
107 * @param sub_system name of sub system
108 * @param peer Peer identity (can be NULL)
109 * @param key entry key string (can be NULL)
110 * @param iter function to call with the result
111 * @param iter_cls closure for @a iter
112 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
115 peerstore_sqlite_iterate_records (void *cls,
116 const char *sub_system,
117 const struct GNUNET_PeerIdentity *peer,
119 GNUNET_PEERSTORE_RecordIterator iter, void *iter_cls)
121 struct Plugin *plugin = cls;
125 const char *ret_sub_system;
126 const struct GNUNET_PeerIdentity *ret_peer;
128 const void *ret_value;
129 size_t ret_value_size;
131 if(NULL == peer && NULL == key)
133 stmt = plugin->select_peerstoredata;
134 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC));
138 stmt = plugin->select_peerstoredata_by_pid;
139 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
140 || (SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC));
142 else if(NULL == peer)
144 stmt = plugin->select_peerstoredata_by_key;
145 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
146 || (SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC));
150 stmt = plugin->select_peerstoredata_by_all;
151 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
152 || (SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC))
153 || (SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC));
158 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
159 "sqlite3_bind_XXXX");
160 if (SQLITE_OK != sqlite3_reset (stmt))
162 GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
164 return GNUNET_SYSERR;
166 while (SQLITE_ROW == (sret = sqlite3_step (stmt)))
168 ret_sub_system = (const char *)sqlite3_column_text(stmt, 0);
169 ret_peer = sqlite3_column_blob(stmt, 1);
170 ret_key = (const char *)sqlite3_column_text(stmt, 2);
171 ret_value = sqlite3_column_blob(stmt, 3);
172 ret_value_size = sqlite3_column_bytes(stmt, 3);
174 iter (iter_cls, ret_sub_system, ret_peer, ret_key, ret_value, ret_value_size);
176 if (SQLITE_DONE != sret)
178 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR, "sqlite_step");
181 if (SQLITE_OK != sqlite3_reset (stmt))
184 GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
189 return GNUNET_SYSERR;
194 * Store a record in the peerstore.
195 * Key is the combination of sub system and peer identity.
196 * One key can store multiple values.
198 * @param cls closure (internal context for the plugin)
199 * @param peer peer identity
200 * @param sub_system name of the GNUnet sub system responsible
201 * @param value value to be stored
202 * @param size size of value to be stored
203 * @return #GNUNET_OK on success, else #GNUNET_SYSERR
206 peerstore_sqlite_store_record(void *cls,
207 const char *sub_system,
208 const struct GNUNET_PeerIdentity *peer,
212 struct GNUNET_TIME_Absolute expiry)
214 struct Plugin *plugin = cls;
215 sqlite3_stmt *stmt = plugin->insert_peerstoredata;
217 //FIXME: check if value exists with the same key first
219 if(SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC)
220 || SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC)
221 || SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC)
222 || SQLITE_OK != sqlite3_bind_blob(stmt, 4, value, size, SQLITE_STATIC)
223 || SQLITE_OK != sqlite3_bind_int64(stmt, 5, (sqlite3_int64)expiry.abs_value_us))
224 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
226 else if (SQLITE_DONE != sqlite3_step (stmt))
228 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
231 if (SQLITE_OK != sqlite3_reset (stmt))
233 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
235 return GNUNET_SYSERR;
243 * @brief Prepare a SQL statement
245 * @param dbh handle to the database
246 * @param sql SQL statement, UTF-8 encoded
247 * @return 0 on success
250 sql_exec (sqlite3 *dbh, const char *sql)
254 result = sqlite3_exec (dbh, sql, NULL, NULL, NULL);
255 LOG (GNUNET_ERROR_TYPE_DEBUG,
256 "Executed `%s' / %d\n", sql, result);
257 if (result != SQLITE_OK)
258 LOG (GNUNET_ERROR_TYPE_ERROR,
259 _("Error executing SQL query: %s\n %s\n"),
260 sqlite3_errmsg (dbh), sql);
265 * @brief Prepare a SQL statement
267 * @param dbh handle to the database
268 * @param sql SQL statement, UTF-8 encoded
269 * @param stmt set to the prepared statement
270 * @return 0 on success
273 sql_prepare (sqlite3 *dbh, const char *sql, sqlite3_stmt **stmt)
278 result = sqlite3_prepare_v2 (dbh, sql, strlen (sql), stmt,
279 (const char **) &tail);
280 LOG (GNUNET_ERROR_TYPE_DEBUG,
281 "Prepared `%s' / %p: %d\n", sql, *stmt, result);
282 if (result != SQLITE_OK)
283 LOG (GNUNET_ERROR_TYPE_ERROR,
284 _("Error preparing SQL query: %s\n %s\n"),
285 sqlite3_errmsg (dbh), sql);
290 * Initialize the database connections and associated
291 * data structures (create tables and indices
292 * as needed as well).
294 * @param plugin the plugin context (state for this module)
295 * @return GNUNET_OK on success
298 database_setup (struct Plugin *plugin)
303 GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "peerstore-sqlite",
304 "FILENAME", &filename))
306 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
307 "peerstore-sqlite", "FILENAME");
308 return GNUNET_SYSERR;
310 if (GNUNET_OK != GNUNET_DISK_file_test (filename))
312 if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (filename))
315 GNUNET_free (filename);
316 return GNUNET_SYSERR;
319 /* filename should be UTF-8-encoded. If it isn't, it's a bug */
320 plugin->fn = filename;
322 /* Open database and precompile statements */
323 if (SQLITE_OK != sqlite3_open (plugin->fn, &plugin->dbh))
325 LOG (GNUNET_ERROR_TYPE_ERROR,
326 _("Unable to initialize SQLite: %s.\n"),
327 sqlite3_errmsg (plugin->dbh));
328 return GNUNET_SYSERR;
331 sql_exec (plugin->dbh, "PRAGMA temp_store=MEMORY");
332 sql_exec (plugin->dbh, "PRAGMA synchronous=NORMAL");
333 sql_exec (plugin->dbh, "PRAGMA legacy_file_format=OFF");
334 sql_exec (plugin->dbh, "PRAGMA auto_vacuum=INCREMENTAL");
335 sql_exec (plugin->dbh, "PRAGMA encoding=\"UTF-8\"");
336 sql_exec (plugin->dbh, "PRAGMA count_changes=OFF");
337 sql_exec (plugin->dbh, "PRAGMA page_size=4096");
339 sqlite3_busy_timeout (plugin->dbh, BUSY_TIMEOUT_MS);
343 sql_exec (plugin->dbh,
344 "CREATE TABLE IF NOT EXISTS peerstoredata (\n"
345 " sub_system TEXT NOT NULL,\n"
346 " peer_id BLOB NOT NULL,\n"
347 " key TEXT NOT NULL,\n"
348 " value BLOB NULL,\n"
349 " expiry INTEGER NOT NULL"
352 /* Prepare statements */
354 sql_prepare (plugin->dbh,
355 "INSERT INTO peerstoredata (sub_system, peer_id, key, value, expiry) VALUES (?,?,?,?,?);",
356 &plugin->insert_peerstoredata);
357 sql_prepare(plugin->dbh,
358 "SELECT * FROM peerstoredata"
359 " WHERE sub_system = ?",
360 &plugin->select_peerstoredata);
361 sql_prepare(plugin->dbh,
362 "SELECT * FROM peerstoredata"
363 " WHERE sub_system = ?"
365 &plugin->select_peerstoredata_by_pid);
366 sql_prepare(plugin->dbh,
367 "SELECT * FROM peerstoredata"
368 " WHERE sub_system = ?"
370 &plugin->select_peerstoredata_by_key);
371 sql_prepare(plugin->dbh,
372 "SELECT * FROM peerstoredata"
373 " WHERE sub_system = ?"
376 &plugin->select_peerstoredata_by_all);
382 * Shutdown database connection and associate data
384 * @param plugin the plugin context (state for this module)
387 database_shutdown (struct Plugin *plugin)
391 while (NULL != (stmt = sqlite3_next_stmt (plugin->dbh, NULL)))
393 result = sqlite3_finalize (stmt);
394 if (SQLITE_OK != result)
395 LOG (GNUNET_ERROR_TYPE_WARNING,
396 "Failed to close statement %p: %d\n", stmt, result);
398 if (SQLITE_OK != sqlite3_close (plugin->dbh))
399 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
401 GNUNET_free_non_null (plugin->fn);
405 * Entry point for the plugin.
407 * @param cls The struct GNUNET_CONFIGURATION_Handle.
408 * @return NULL on error, otherwise the plugin context
411 libgnunet_plugin_peerstore_sqlite_init (void *cls)
413 static struct Plugin plugin;
414 const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
415 struct GNUNET_PEERSTORE_PluginFunctions *api;
417 if (NULL != plugin.cfg)
418 return NULL; /* can only initialize once! */
419 memset (&plugin, 0, sizeof (struct Plugin));
421 if (GNUNET_OK != database_setup (&plugin))
423 database_shutdown (&plugin);
426 api = GNUNET_new (struct GNUNET_PEERSTORE_PluginFunctions);
428 api->store_record = &peerstore_sqlite_store_record;
429 api->iterate_records = &peerstore_sqlite_iterate_records;
430 LOG(GNUNET_ERROR_TYPE_DEBUG, "Sqlite plugin is running\n");
435 * Exit point from the plugin.
437 * @param cls The plugin context (as returned by "init")
438 * @return Always NULL
441 libgnunet_plugin_peerstore_sqlite_done (void *cls)
443 struct GNUNET_PEERSTORE_PluginFunctions *api = cls;
444 struct Plugin *plugin = api->cls;
446 database_shutdown (plugin);
449 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sqlite plugin is finished\n");
454 /* end of plugin_peerstore_sqlite.c */