2 This file is part of GNUnet
3 Copyright (C) 2017 GNUnet e.V.
5 GNUnet is free software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the Free Software
7 Foundation; either version 3, or (at your option) any later version.
9 GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY
10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License along with
14 GNUnet; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
17 * @file include/gnunet_sq_lib.h
18 * @brief helper functions for Sqlite3 DB interactions
19 * @author Christian Grothoff
21 #ifndef GNUNET_SQ_LIB_H
22 #define GNUNET_SQ_LIB_H
24 #include <sqlite/sqlite3.h>
25 #include "gnunet_util_lib.h"
29 * Function called to convert input argument into SQL parameters.
32 * @param data pointer to input argument
33 * @param data_len number of bytes in @a data (if applicable)
34 * @param stmt sqlite statement to bind parameters for
35 * @param off offset of the argument to bind in @a stmt, numbered from 1,
36 * so immediately suitable for passing to `sqlite3_bind`-functions.
37 * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
40 (*GNUNET_SQ_QueryConverter)(void *cls,
48 * @brief Description of a DB query parameter.
50 struct GNUNET_SQ_QueryParam
54 * Function for how to handle this type of entry.
56 GNUNET_SQ_QueryConverter conv;
59 * Closure for @e conv.
74 * Number of parameters eaten by this operation.
76 unsigned int num_params;
81 * End of query parameter specification.
83 #define GNUNET_SQ_query_param_end { NULL, NULL, NULL, 0, 0 }
87 * Generate query parameter for a buffer @a ptr of
90 * @param ptr pointer to the query parameter to pass
91 * @oaran ptr_size number of bytes in @a ptr
93 struct GNUNET_SQ_QueryParam
94 GNUNET_SQ_query_param_fixed_size (const void *ptr,
100 * Generate query parameter for a string.
102 * @param ptr pointer to the string query parameter to pass
104 struct GNUNET_SQ_QueryParam
105 GNUNET_SQ_query_param_string (const char *ptr);
109 * Generate fixed-size query parameter with size determined
112 * @param x pointer to the query parameter to pass.
114 #define GNUNET_SQ_query_param_auto_from_type(x) GNUNET_SQ_query_param_fixed_size ((x), sizeof (*(x)))
118 * Generate query parameter for an RSA public key. The
119 * database must contain a BLOB type in the respective position.
121 * @param x the query parameter to pass.
123 struct GNUNET_SQ_QueryParam
124 GNUNET_SQ_query_param_rsa_public_key (const struct GNUNET_CRYPTO_RsaPublicKey *x);
128 * Generate query parameter for an RSA signature. The
129 * database must contain a BLOB type in the respective position.
131 * @param x the query parameter to pass
133 struct GNUNET_SQ_QueryParam
134 GNUNET_SQ_query_param_rsa_signature (const struct GNUNET_CRYPTO_RsaSignature *x);
138 * Generate query parameter for an absolute time value.
139 * The database must store a 64-bit integer.
141 * @param x pointer to the query parameter to pass
143 struct GNUNET_SQ_QueryParam
144 GNUNET_SQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x);
148 * Generate query parameter for an absolute time value.
149 * The database must store a 64-bit integer.
151 * @param x pointer to the query parameter to pass
153 struct GNUNET_SQ_QueryParam
154 GNUNET_SQ_query_param_absolute_time_nbo (const struct GNUNET_TIME_AbsoluteNBO *x);
158 * Generate query parameter for an uint16_t in host byte order.
160 * @param x pointer to the query parameter to pass
162 struct GNUNET_SQ_QueryParam
163 GNUNET_SQ_query_param_uint16 (const uint16_t *x);
167 * Generate query parameter for an uint32_t in host byte order.
169 * @param x pointer to the query parameter to pass
171 struct GNUNET_SQ_QueryParam
172 GNUNET_SQ_query_param_uint32 (const uint32_t *x);
176 * Generate query parameter for an uint16_t in host byte order.
178 * @param x pointer to the query parameter to pass
180 struct GNUNET_SQ_QueryParam
181 GNUNET_SQ_query_param_uint64 (const uint64_t *x);
185 * Extract data from a Postgres database @a result at row @a row.
188 * @param result where to extract data from
189 * @param int row to extract data from
190 * @param[in,out] dst_size where to store size of result, may be NULL
191 * @param[out] dst where to store the result
193 * #GNUNET_YES if all results could be extracted
194 * #GNUNET_SYSERR if a result was invalid (non-existing field or NULL)
197 (*GNUNET_SQ_ResultConverter)(void *cls,
198 sqlite3_stmt *result,
205 * Function called to clean up memory allocated
206 * by a #GNUNET_SQ_ResultConverter.
209 * @param rd result data to clean up
212 (*GNUNET_SQ_ResultCleanup)(void *cls,
217 * @brief Description of a DB result cell.
219 struct GNUNET_SQ_ResultSpec
223 * What is the format of the result?
225 GNUNET_SQ_ResultConverter conv;
228 * Function to clean up result data, NULL if cleanup is
231 GNUNET_SQ_ResultCleanup cleaner;
234 * Closure for @e conv and @e cleaner.
239 * Destination for the data.
244 * Allowed size for the data, 0 for variable-size
245 * (in this case, the type of @e dst is a `void **`
246 * and we need to allocate a buffer of the right size).
251 * Where to store actual size of the result.
259 * End of result parameter specification.
261 * @return array last entry for the result specification to use
263 #define GNUNET_SQ_result_spec_end { NULL, NULL, NULL, NULL, 0, NULL }
267 * Variable-size result expected.
269 * @param[out] dst where to store the result, allocated
270 * @param[out] sptr where to store the size of @a dst
271 * @return array entry for the result specification to use
273 struct GNUNET_SQ_ResultSpec
274 GNUNET_SQ_result_spec_variable_size (void **dst,
279 * Fixed-size result expected.
281 * @param[out] dst where to store the result
282 * @param dst_size number of bytes in @a dst
283 * @return array entry for the result specification to use
285 struct GNUNET_SQ_ResultSpec
286 GNUNET_SQ_result_spec_fixed_size (void *dst,
291 * We expect a fixed-size result, with size determined by the type of `* dst`
293 * @param dst point to where to store the result, type fits expected result size
294 * @return array entry for the result specification to use
296 #define GNUNET_SQ_result_spec_auto_from_type(dst) GNUNET_SQ_result_spec_fixed_size (name, (dst), sizeof (*(dst)))
300 * Variable-size result expected.
302 * @param[out] dst where to store the result, allocated
303 * @param[out] sptr where to store the size of @a dst
304 * @return array entry for the result specification to use
306 struct GNUNET_SQ_ResultSpec
307 GNUNET_SQ_result_spec_variable_size (void **dst,
312 * 0-terminated string expected.
314 * @param[out] dst where to store the result, allocated
315 * @return array entry for the result specification to use
317 struct GNUNET_SQ_ResultSpec
318 GNUNET_SQ_result_spec_string (char **dst);
322 * RSA public key expected.
324 * @param[out] rsa where to store the result
325 * @return array entry for the result specification to use
327 struct GNUNET_SQ_ResultSpec
328 GNUNET_SQ_result_spec_rsa_public_key (struct GNUNET_CRYPTO_RsaPublicKey **rsa);
332 * RSA signature expected.
334 * @param[out] sig where to store the result;
335 * @return array entry for the result specification to use
337 struct GNUNET_SQ_ResultSpec
338 GNUNET_SQ_result_spec_rsa_signature (struct GNUNET_CRYPTO_RsaSignature **sig);
342 * Absolute time expected.
344 * @param[out] at where to store the result
345 * @return array entry for the result specification to use
347 struct GNUNET_SQ_ResultSpec
348 GNUNET_SQ_result_spec_absolute_time (struct GNUNET_TIME_Absolute *at);
352 * Absolute time expected.
354 * @param[out] at where to store the result
355 * @return array entry for the result specification to use
357 struct GNUNET_SQ_ResultSpec
358 GNUNET_SQ_result_spec_absolute_time_nbo (struct GNUNET_TIME_AbsoluteNBO *at);
364 * @param[out] u16 where to store the result
365 * @return array entry for the result specification to use
367 struct GNUNET_SQ_ResultSpec
368 GNUNET_SQ_result_spec_uint16 (uint16_t *u16);
374 * @param[out] u32 where to store the result
375 * @return array entry for the result specification to use
377 struct GNUNET_SQ_ResultSpec
378 GNUNET_SQ_result_spec_uint32 (uint32_t *u32);
384 * @param[out] u64 where to store the result
385 * @return array entry for the result specification to use
387 struct GNUNET_SQ_ResultSpec
388 GNUNET_SQ_result_spec_uint64 (uint64_t *u64);
392 * Execute a prepared statement.
394 * @param db_conn database connection
395 * @param params parameters to the statement
396 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
399 GNUNET_SQ_bind (sqlite3_stmt *stmt,
400 const struct GNUNET_SQ_QueryParam *params);
404 * Extract results from a query result according to the given specification.
406 * @param result result to process
407 * @param[in,out] rs result specification to extract for
408 * @param row row from the result to extract
410 * #GNUNET_YES if all results could be extracted
411 * #GNUNET_SYSERR if a result was invalid (non-existing field)
414 GNUNET_SQ_extract_result (sqlite3_stmt *result,
415 struct GNUNET_SQ_ResultSpec *rs,
420 * Free all memory that was allocated in @a rs during
421 * #GNUNET_SQ_extract_result().
423 * @param rs reult specification to clean up
426 GNUNET_SQ_cleanup_result (struct GNUNET_SQ_ResultSpec *rs);
429 #endif /* GNUNET_SQ_LIB_H_ */
431 /* end of include/gnunet_sq_lib.h */