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_Processor iter, void *iter_cls)
121 struct Plugin *plugin = cls;
125 struct GNUNET_PEERSTORE_Record *ret;
127 LOG(GNUNET_ERROR_TYPE_DEBUG, "Executing iterate request on sqlite db.\n");
128 if(NULL == peer && NULL == key)
130 stmt = plugin->select_peerstoredata;
131 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC));
135 stmt = plugin->select_peerstoredata_by_pid;
136 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
137 || (SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC));
139 else if(NULL == peer)
141 stmt = plugin->select_peerstoredata_by_key;
142 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
143 || (SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC));
147 stmt = plugin->select_peerstoredata_by_all;
148 err = (SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC))
149 || (SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC))
150 || (SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC));
155 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
156 "sqlite3_bind_XXXX");
157 if (SQLITE_OK != sqlite3_reset (stmt))
159 GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
161 return GNUNET_SYSERR;
163 while (SQLITE_ROW == (sret = sqlite3_step (stmt)))
165 LOG(GNUNET_ERROR_TYPE_DEBUG, "Returning a matched record.\n");
166 ret = GNUNET_new(struct GNUNET_PEERSTORE_Record);
167 ret->sub_system = (char *)sqlite3_column_text(stmt, 0);
168 ret->peer = (struct GNUNET_PeerIdentity *)sqlite3_column_blob(stmt, 1);
169 ret->key = (char *)sqlite3_column_text(stmt, 2);
170 ret->value = (void *)sqlite3_column_blob(stmt, 3);
171 ret->value_size = sqlite3_column_bytes(stmt, 3);
172 ret->expiry = GNUNET_new(struct GNUNET_TIME_Absolute);
173 ret->expiry->abs_value_us = (uint64_t)sqlite3_column_int64(stmt, 4);
179 if (SQLITE_DONE != sret)
181 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR, "sqlite_step");
184 if (SQLITE_OK != sqlite3_reset (stmt))
187 GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
192 return GNUNET_SYSERR;
197 * Store a record in the peerstore.
198 * Key is the combination of sub system and peer identity.
199 * One key can store multiple values.
201 * @param cls closure (internal context for the plugin)
202 * @param peer peer identity
203 * @param sub_system name of the GNUnet sub system responsible
204 * @param value value to be stored
205 * @param size size of value to be stored
206 * @return #GNUNET_OK on success, else #GNUNET_SYSERR
209 peerstore_sqlite_store_record(void *cls,
210 const char *sub_system,
211 const struct GNUNET_PeerIdentity *peer,
215 struct GNUNET_TIME_Absolute expiry)
217 struct Plugin *plugin = cls;
218 sqlite3_stmt *stmt = plugin->insert_peerstoredata;
220 //FIXME: check if value exists with the same key first
222 if(SQLITE_OK != sqlite3_bind_text(stmt, 1, sub_system, strlen(sub_system) + 1, SQLITE_STATIC)
223 || SQLITE_OK != sqlite3_bind_blob(stmt, 2, peer, sizeof(struct GNUNET_PeerIdentity), SQLITE_STATIC)
224 || SQLITE_OK != sqlite3_bind_text(stmt, 3, key, strlen(key) + 1, SQLITE_STATIC)
225 || SQLITE_OK != sqlite3_bind_blob(stmt, 4, value, size, SQLITE_STATIC)
226 || SQLITE_OK != sqlite3_bind_int64(stmt, 5, (sqlite3_int64)expiry.abs_value_us))
227 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
229 else if (SQLITE_DONE != sqlite3_step (stmt))
231 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
234 if (SQLITE_OK != sqlite3_reset (stmt))
236 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
238 return GNUNET_SYSERR;
246 * @brief Prepare a SQL statement
248 * @param dbh handle to the database
249 * @param sql SQL statement, UTF-8 encoded
250 * @return 0 on success
253 sql_exec (sqlite3 *dbh, const char *sql)
257 result = sqlite3_exec (dbh, sql, NULL, NULL, NULL);
258 LOG (GNUNET_ERROR_TYPE_DEBUG,
259 "Executed `%s' / %d\n", sql, result);
260 if (result != SQLITE_OK)
261 LOG (GNUNET_ERROR_TYPE_ERROR,
262 _("Error executing SQL query: %s\n %s\n"),
263 sqlite3_errmsg (dbh), sql);
268 * @brief Prepare a SQL statement
270 * @param dbh handle to the database
271 * @param sql SQL statement, UTF-8 encoded
272 * @param stmt set to the prepared statement
273 * @return 0 on success
276 sql_prepare (sqlite3 *dbh, const char *sql, sqlite3_stmt **stmt)
281 result = sqlite3_prepare_v2 (dbh, sql, strlen (sql), stmt,
282 (const char **) &tail);
283 LOG (GNUNET_ERROR_TYPE_DEBUG,
284 "Prepared `%s' / %p: %d\n", sql, *stmt, result);
285 if (result != SQLITE_OK)
286 LOG (GNUNET_ERROR_TYPE_ERROR,
287 _("Error preparing SQL query: %s\n %s\n"),
288 sqlite3_errmsg (dbh), sql);
293 * Initialize the database connections and associated
294 * data structures (create tables and indices
295 * as needed as well).
297 * @param plugin the plugin context (state for this module)
298 * @return GNUNET_OK on success
301 database_setup (struct Plugin *plugin)
306 GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "peerstore-sqlite",
307 "FILENAME", &filename))
309 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
310 "peerstore-sqlite", "FILENAME");
311 return GNUNET_SYSERR;
313 if (GNUNET_OK != GNUNET_DISK_file_test (filename))
315 if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (filename))
318 GNUNET_free (filename);
319 return GNUNET_SYSERR;
322 /* filename should be UTF-8-encoded. If it isn't, it's a bug */
323 plugin->fn = filename;
325 /* Open database and precompile statements */
326 if (SQLITE_OK != sqlite3_open (plugin->fn, &plugin->dbh))
328 LOG (GNUNET_ERROR_TYPE_ERROR,
329 _("Unable to initialize SQLite: %s.\n"),
330 sqlite3_errmsg (plugin->dbh));
331 return GNUNET_SYSERR;
334 sql_exec (plugin->dbh, "PRAGMA temp_store=MEMORY");
335 sql_exec (plugin->dbh, "PRAGMA synchronous=NORMAL");
336 sql_exec (plugin->dbh, "PRAGMA legacy_file_format=OFF");
337 sql_exec (plugin->dbh, "PRAGMA auto_vacuum=INCREMENTAL");
338 sql_exec (plugin->dbh, "PRAGMA encoding=\"UTF-8\"");
339 sql_exec (plugin->dbh, "PRAGMA count_changes=OFF");
340 sql_exec (plugin->dbh, "PRAGMA page_size=4096");
342 sqlite3_busy_timeout (plugin->dbh, BUSY_TIMEOUT_MS);
346 sql_exec (plugin->dbh,
347 "CREATE TABLE IF NOT EXISTS peerstoredata (\n"
348 " sub_system TEXT NOT NULL,\n"
349 " peer_id BLOB NOT NULL,\n"
350 " key TEXT NOT NULL,\n"
351 " value BLOB NULL,\n"
352 " expiry INTEGER NOT NULL"
355 /* Prepare statements */
357 sql_prepare (plugin->dbh,
358 "INSERT INTO peerstoredata (sub_system, peer_id, key, value, expiry) VALUES (?,?,?,?,?);",
359 &plugin->insert_peerstoredata);
360 sql_prepare(plugin->dbh,
361 "SELECT * FROM peerstoredata"
362 " WHERE sub_system = ?",
363 &plugin->select_peerstoredata);
364 sql_prepare(plugin->dbh,
365 "SELECT * FROM peerstoredata"
366 " WHERE sub_system = ?"
368 &plugin->select_peerstoredata_by_pid);
369 sql_prepare(plugin->dbh,
370 "SELECT * FROM peerstoredata"
371 " WHERE sub_system = ?"
373 &plugin->select_peerstoredata_by_key);
374 sql_prepare(plugin->dbh,
375 "SELECT * FROM peerstoredata"
376 " WHERE sub_system = ?"
379 &plugin->select_peerstoredata_by_all);
385 * Shutdown database connection and associate data
387 * @param plugin the plugin context (state for this module)
390 database_shutdown (struct Plugin *plugin)
394 while (NULL != (stmt = sqlite3_next_stmt (plugin->dbh, NULL)))
396 result = sqlite3_finalize (stmt);
397 if (SQLITE_OK != result)
398 LOG (GNUNET_ERROR_TYPE_WARNING,
399 "Failed to close statement %p: %d\n", stmt, result);
401 if (SQLITE_OK != sqlite3_close (plugin->dbh))
402 LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR, "sqlite3_close");
404 GNUNET_free_non_null (plugin->fn);
408 * Entry point for the plugin.
410 * @param cls The struct GNUNET_CONFIGURATION_Handle.
411 * @return NULL on error, otherwise the plugin context
414 libgnunet_plugin_peerstore_sqlite_init (void *cls)
416 static struct Plugin plugin;
417 const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
418 struct GNUNET_PEERSTORE_PluginFunctions *api;
420 if (NULL != plugin.cfg)
421 return NULL; /* can only initialize once! */
422 memset (&plugin, 0, sizeof (struct Plugin));
424 if (GNUNET_OK != database_setup (&plugin))
426 database_shutdown (&plugin);
429 api = GNUNET_new (struct GNUNET_PEERSTORE_PluginFunctions);
431 api->store_record = &peerstore_sqlite_store_record;
432 api->iterate_records = &peerstore_sqlite_iterate_records;
433 LOG(GNUNET_ERROR_TYPE_DEBUG, "Sqlite plugin is running\n");
438 * Exit point from the plugin.
440 * @param cls The plugin context (as returned by "init")
441 * @return Always NULL
444 libgnunet_plugin_peerstore_sqlite_done (void *cls)
446 struct GNUNET_PEERSTORE_PluginFunctions *api = cls;
447 struct Plugin *plugin = api->cls;
449 database_shutdown (plugin);
452 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sqlite plugin is finished\n");
457 /* end of plugin_peerstore_sqlite.c */