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21 * @file pq/pq_connect.c
22 * @brief functions to connect to libpq (PostGres)
23 * @author Christian Grothoff
30 * Function called by libpq whenever it wants to log something.
31 * We already log whenever we care, so this function does nothing
32 * and merely exists to silence the libpq logging.
34 * @param arg the SQL connection that was used
35 * @param res information about some libpq event
38 pq_notice_receiver_cb (void *arg,
41 /* do nothing, intentionally */
48 * Function called by libpq whenever it wants to log something.
49 * We log those using the GNUnet logger.
51 * @param arg the SQL connection that was used
52 * @param message information about some libpq event
55 pq_notice_processor_cb (void *arg,
59 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
67 * Create a connection to the Postgres database using @a config_str for the
68 * configuration. Initialize logging via GNUnet's log routines and disable
69 * Postgres's logger. Also ensures that the statements in @a load_path and @a
70 * es are executed whenever we (re)connect to the database, and that the
71 * prepared statements in @a ps are "ready". If statements in @es fail that
72 * were created with #GNUNET_PQ_make_execute(), then the entire operation
75 * In @a load_path, a list of "$XXXX.sql" files is expected where $XXXX
76 * must be a sequence of contiguous integer values starting at 0000.
77 * These files are then loaded in sequence using "psql $config_str" before
78 * running statements from @e es. The directory is inspected again on
81 * @param config_str configuration to use
82 * @param load_path path to directory with SQL transactions to run, can be NULL
83 * @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated
84 * array of statements to execute upon EACH connection, can be NULL
85 * @param ps array of prepared statements to prepare, can be NULL
86 * @return NULL on error
88 struct GNUNET_PQ_Context *
89 GNUNET_PQ_connect (const char *config_str,
90 const char *load_path,
91 const struct GNUNET_PQ_ExecuteStatement *es,
92 const struct GNUNET_PQ_PreparedStatement *ps)
94 struct GNUNET_PQ_Context *db;
95 unsigned int elen = 0;
96 unsigned int plen = 0;
99 while (NULL != es[elen].sql)
102 while (NULL != ps[plen].name)
105 db = GNUNET_new (struct GNUNET_PQ_Context);
106 db->config_str = GNUNET_strdup (config_str);
107 if (NULL != load_path)
108 db->load_path = GNUNET_strdup (load_path);
111 db->es = GNUNET_new_array (elen + 1,
112 struct GNUNET_PQ_ExecuteStatement);
115 elen * sizeof (struct GNUNET_PQ_ExecuteStatement));
119 db->ps = GNUNET_new_array (plen + 1,
120 struct GNUNET_PQ_PreparedStatement);
123 plen * sizeof (struct GNUNET_PQ_PreparedStatement));
125 GNUNET_PQ_reconnect (db);
126 if (NULL == db->conn)
128 GNUNET_free_non_null (db->load_path);
129 GNUNET_free (db->config_str);
138 * Within the @a db context, run all the SQL files
139 * from the @a load_path from 0000-9999.sql (as long
140 * as the files exist contiguously).
142 * @param db database context to use
143 * @param load_path where to find the XXXX.sql files
144 * @return #GNUNET_OK on success
147 GNUNET_PQ_run_sql (struct GNUNET_PQ_Context *db,
148 const char *load_path)
150 size_t slen = strlen (load_path) + 10;
152 for (unsigned int i = 0; i<10000; i++)
155 struct GNUNET_OS_Process *psql;
156 enum GNUNET_OS_ProcessStatusType type;
159 GNUNET_snprintf (buf,
165 GNUNET_DISK_file_test (buf))
166 break; /* We are done */
167 psql = GNUNET_OS_start_process (GNUNET_NO,
168 GNUNET_OS_INHERIT_STD_NONE,
181 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
184 return GNUNET_SYSERR;
186 GNUNET_assert (GNUNET_OK ==
187 GNUNET_OS_process_wait_status (psql,
190 GNUNET_OS_process_destroy (psql);
191 if ( (GNUNET_OS_PROCESS_EXITED != type) ||
194 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
195 "Could not run PSQL on file %s: %d",
198 return GNUNET_SYSERR;
206 * Reinitialize the database @a db if the connection is down.
208 * @param db database connection to reinitialize
211 GNUNET_PQ_reconnect_if_down (struct GNUNET_PQ_Context *db)
213 if (CONNECTION_BAD != PQstatus (db->conn))
215 GNUNET_PQ_reconnect (db);
220 * Reinitialize the database @a db.
222 * @param db database connection to reinitialize
225 GNUNET_PQ_reconnect (struct GNUNET_PQ_Context *db)
227 if (NULL != db->conn)
229 db->conn = PQconnectdb (db->config_str);
230 if ((NULL == db->conn) ||
231 (CONNECTION_OK != PQstatus (db->conn)))
233 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
235 "Database connection to '%s' failed: %s\n",
238 PQerrorMessage (db->conn)
239 : "PQconnectdb returned NULL");
240 if (NULL != db->conn)
247 PQsetNoticeReceiver (db->conn,
248 &pq_notice_receiver_cb,
250 PQsetNoticeProcessor (db->conn,
251 &pq_notice_processor_cb,
253 if ( (NULL != db->load_path) &&
255 GNUNET_PQ_run_sql (db,
262 if ( (NULL != db->es) &&
264 GNUNET_PQ_exec_statements (db,
271 if ( (NULL != db->ps) &&
273 GNUNET_PQ_prepare_statements (db,
284 * Connect to a postgres database using the configuration
285 * option "CONFIG" in @a section. Also ensures that the
286 * statements in @a es are executed whenever we (re)connect to the
287 * database, and that the prepared statements in @a ps are "ready".
289 * The caller does not have to ensure that @a es and @a ps remain allocated
290 * and initialized in memory until #GNUNET_PQ_disconnect() is called, as a copy will be made.
292 * @param cfg configuration
293 * @param section configuration section to use to get Postgres configuration options
294 * @param load_path_suffix suffix to append to the SQL_DIR in the configuration
295 * @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated
296 * array of statements to execute upon EACH connection, can be NULL
297 * @param ps array of prepared statements to prepare, can be NULL
298 * @return the postgres handle, NULL on error
300 struct GNUNET_PQ_Context *
301 GNUNET_PQ_connect_with_cfg (const struct GNUNET_CONFIGURATION_Handle *cfg,
303 const char *load_path_suffix,
304 const struct GNUNET_PQ_ExecuteStatement *es,
305 const struct GNUNET_PQ_PreparedStatement *ps)
307 struct GNUNET_PQ_Context *db;
313 GNUNET_CONFIGURATION_get_value_string (cfg,
320 if ( (NULL != load_path_suffix) &&
322 GNUNET_CONFIGURATION_get_value_filename (cfg,
326 GNUNET_asprintf (&load_path,
330 db = GNUNET_PQ_connect (conninfo == NULL ? "" : conninfo,
334 GNUNET_free_non_null (load_path);
335 GNUNET_free_non_null (sp);
336 GNUNET_free_non_null (conninfo);
342 * Disconnect from the database, destroying the prepared statements
343 * and releasing other associated resources.
345 * @param db database handle to disconnect (will be free'd)
348 GNUNET_PQ_disconnect (struct GNUNET_PQ_Context *db)
350 GNUNET_free_non_null (db->es);
351 GNUNET_free_non_null (db->ps);
352 GNUNET_free_non_null (db->load_path);
353 GNUNET_free_non_null (db->config_str);
359 /* end of pq/pq_connect.c */