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- /*
- This file is part of GNUnet
- Copyright (C) 2017 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file include/gnunet_sq_lib.h
- * @brief helper functions for Sqlite3 DB interactions
- * @author Christian Grothoff
- */
- #ifndef GNUNET_SQ_LIB_H
- #define GNUNET_SQ_LIB_H
- #include <sqlite3.h>
- #include "gnunet_util_lib.h"
- /**
- * Function called to convert input argument into SQL parameters.
- *
- * @param cls closure
- * @param data pointer to input argument
- * @param data_len number of bytes in @a data (if applicable)
- * @param stmt sqlite statement to bind parameters for
- * @param off offset of the argument to bind in @a stmt, numbered from 1,
- * so immediately suitable for passing to `sqlite3_bind`-functions.
- * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
- */
- typedef int
- (*GNUNET_SQ_QueryConverter)(void *cls,
- const void *data,
- size_t data_len,
- sqlite3_stmt *stmt,
- unsigned int off);
- /**
- * @brief Description of a DB query parameter.
- */
- struct GNUNET_SQ_QueryParam
- {
- /**
- * Function for how to handle this type of entry.
- */
- GNUNET_SQ_QueryConverter conv;
- /**
- * Closure for @e conv.
- */
- void *conv_cls;
- /**
- * Data or NULL.
- */
- const void *data;
- /**
- * Size of @e data
- */
- size_t size;
- /**
- * Number of parameters eaten by this operation.
- */
- unsigned int num_params;
- };
- /**
- * End of query parameter specification.
- */
- #define GNUNET_SQ_query_param_end { NULL, NULL, NULL, 0, 0 }
- /**
- * Generate query parameter for a buffer @a ptr of
- * @a ptr_size bytes.
- *
- * @param ptr pointer to the query parameter to pass
- * @oaran ptr_size number of bytes in @a ptr
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_fixed_size (const void *ptr,
- size_t ptr_size);
- /**
- * Generate query parameter for a string.
- *
- * @param ptr pointer to the string query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_string (const char *ptr);
- /**
- * Generate fixed-size query parameter with size determined
- * by variable type.
- *
- * @param x pointer to the query parameter to pass.
- */
- #define GNUNET_SQ_query_param_auto_from_type( \
- x) GNUNET_SQ_query_param_fixed_size ((x), sizeof(*(x)))
- /**
- * Generate query parameter for an RSA public key. The
- * database must contain a BLOB type in the respective position.
- *
- * @param x the query parameter to pass.
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_rsa_public_key (const struct
- GNUNET_CRYPTO_RsaPublicKey *x);
- /**
- * Generate query parameter for an RSA signature. The
- * database must contain a BLOB type in the respective position.
- *
- * @param x the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_rsa_signature (const struct
- GNUNET_CRYPTO_RsaSignature *x);
- /**
- * Generate query parameter for an absolute time value.
- * The database must store a 64-bit integer.
- *
- * @param x pointer to the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x);
- /**
- * Generate query parameter for an absolute time value.
- * The database must store a 64-bit integer.
- *
- * @param x pointer to the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_absolute_time_nbo (const struct
- GNUNET_TIME_AbsoluteNBO *x);
- /**
- * Generate query parameter for an uint16_t in host byte order.
- *
- * @param x pointer to the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_uint16 (const uint16_t *x);
- /**
- * Generate query parameter for an uint32_t in host byte order.
- *
- * @param x pointer to the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_uint32 (const uint32_t *x);
- /**
- * Generate query parameter for an uint16_t in host byte order.
- *
- * @param x pointer to the query parameter to pass
- */
- struct GNUNET_SQ_QueryParam
- GNUNET_SQ_query_param_uint64 (const uint64_t *x);
- /**
- * Execute binding operations for a prepared statement.
- *
- * @param db_conn database connection
- * @param params parameters to the statement
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
- */
- int
- GNUNET_SQ_bind (sqlite3_stmt *stmt,
- const struct GNUNET_SQ_QueryParam *params);
- /**
- * Reset @a stmt and log error.
- *
- * @param dbh database handle
- * @param stmt statement to reset
- */
- void
- GNUNET_SQ_reset (sqlite3 *dbh,
- sqlite3_stmt *stmt);
- /**
- * Extract data from a Postgres database @a result at row @a row.
- *
- * @param cls closure
- * @param result where to extract data from
- * @param column column to extract data from
- * @param[in,out] dst_size where to store size of result, may be NULL
- * @param[out] dst where to store the result
- * @return
- * #GNUNET_YES if all results could be extracted
- * #GNUNET_SYSERR if a result was invalid (non-existing field or NULL)
- */
- typedef int
- (*GNUNET_SQ_ResultConverter)(void *cls,
- sqlite3_stmt *result,
- unsigned int column,
- size_t *dst_size,
- void *dst);
- /**
- * @brief Description of a DB result cell.
- */
- struct GNUNET_SQ_ResultSpec;
- /**
- * Function called to clean up memory allocated
- * by a #GNUNET_SQ_ResultConverter.
- *
- * @param cls closure
- */
- typedef void
- (*GNUNET_SQ_ResultCleanup)(void *cls);
- /**
- * @brief Description of a DB result cell.
- */
- struct GNUNET_SQ_ResultSpec
- {
- /**
- * What is the format of the result?
- */
- GNUNET_SQ_ResultConverter conv;
- /**
- * Function to clean up result data, NULL if cleanup is
- * not necessary.
- */
- GNUNET_SQ_ResultCleanup cleaner;
- /**
- * Closure for @e conv and @e cleaner.
- */
- void *cls;
- /**
- * Destination for the data.
- */
- void *dst;
- /**
- * Allowed size for the data, 0 for variable-size
- * (in this case, the type of @e dst is a `void **`
- * and we need to allocate a buffer of the right size).
- */
- size_t dst_size;
- /**
- * Where to store actual size of the result. If left at
- * NULL, will be made to point to @e dst_size before
- * @a conv is called.
- */
- size_t *result_size;
- /**
- * Number of parameters (columns) eaten by this operation.
- */
- unsigned int num_params;
- };
- /**
- * End of result parameter specification.
- *
- * @return array last entry for the result specification to use
- */
- #define GNUNET_SQ_result_spec_end { NULL, NULL, NULL, NULL, 0, NULL, 0 }
- /**
- * Variable-size result expected.
- *
- * @param[out] dst where to store the result, allocated
- * @param[out] sptr where to store the size of @a dst
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_variable_size (void **dst,
- size_t *sptr);
- /**
- * Fixed-size result expected.
- *
- * @param[out] dst where to store the result
- * @param dst_size number of bytes in @a dst
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_fixed_size (void *dst,
- size_t dst_size);
- /**
- * We expect a fixed-size result, with size determined by the type of `* dst`
- *
- * @param dst point to where to store the result, type fits expected result size
- * @return array entry for the result specification to use
- */
- #define GNUNET_SQ_result_spec_auto_from_type( \
- dst) GNUNET_SQ_result_spec_fixed_size ((dst), sizeof(*(dst)))
- /**
- * Variable-size result expected.
- *
- * @param[out] dst where to store the result, allocated
- * @param[out] sptr where to store the size of @a dst
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_variable_size (void **dst,
- size_t *sptr);
- /**
- * 0-terminated string expected.
- *
- * @param[out] dst where to store the result, allocated
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_string (char **dst);
- /**
- * RSA public key expected.
- *
- * @param[out] rsa where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_rsa_public_key (struct GNUNET_CRYPTO_RsaPublicKey **rsa);
- /**
- * RSA signature expected.
- *
- * @param[out] sig where to store the result;
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_rsa_signature (struct GNUNET_CRYPTO_RsaSignature **sig);
- /**
- * Absolute time expected.
- *
- * @param[out] at where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_absolute_time (struct GNUNET_TIME_Absolute *at);
- /**
- * Absolute time expected.
- *
- * @param[out] at where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_absolute_time_nbo (struct GNUNET_TIME_AbsoluteNBO *at);
- /**
- * uint16_t expected.
- *
- * @param[out] u16 where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_uint16 (uint16_t *u16);
- /**
- * uint32_t expected.
- *
- * @param[out] u32 where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_uint32 (uint32_t *u32);
- /**
- * uint64_t expected.
- *
- * @param[out] u64 where to store the result
- * @return array entry for the result specification to use
- */
- struct GNUNET_SQ_ResultSpec
- GNUNET_SQ_result_spec_uint64 (uint64_t *u64);
- /**
- * Extract results from a query result according to the given specification.
- *
- * @param result result to process
- * @param[in,out] rs result specification to extract for
- * @return
- * #GNUNET_OK if all results could be extracted
- * #GNUNET_SYSERR if a result was invalid (non-existing field)
- */
- int
- GNUNET_SQ_extract_result (sqlite3_stmt *result,
- struct GNUNET_SQ_ResultSpec *rs);
- /**
- * Free all memory that was allocated in @a rs during
- * #GNUNET_SQ_extract_result().
- *
- * @param rs reult specification to clean up
- */
- void
- GNUNET_SQ_cleanup_result (struct GNUNET_SQ_ResultSpec *rs);
- /* ******************** sq_prepare.c functions ************** */
- /**
- * Information needed to run a list of SQL statements using
- * #GNUNET_SQ_exec_statements().
- */
- struct GNUNET_SQ_PrepareStatement
- {
- /**
- * Actual SQL statement.
- */
- const char *sql;
- /**
- * Where to store handle?
- */
- sqlite3_stmt **pstmt;
- };
- /**
- * Terminator for executable statement list.
- */
- #define GNUNET_SQ_PREPARE_END { NULL, NULL }
- /**
- * Create a `struct GNUNET_SQ_PrepareStatement`
- *
- * @param sql actual SQL statement
- * @param pstmt where to store the handle
- * @return initialized struct
- */
- struct GNUNET_SQ_PrepareStatement
- GNUNET_SQ_make_prepare (const char *sql,
- sqlite3_stmt **pstmt);
- /**
- * Prepare all statements given in the (NULL,NULL)-terminated
- * array at @a ps
- *
- * @param dbh database handle
- * @param ps array of statements to prepare
- * @return #GNUNET_OK on success
- */
- int
- GNUNET_SQ_prepare (sqlite3 *dbh,
- const struct GNUNET_SQ_PrepareStatement *ps);
- /* ******************** sq_exec.c functions ************** */
- /**
- * Information needed to run a list of SQL statements using
- * #GNUNET_SQ_exec_statements().
- */
- struct GNUNET_SQ_ExecuteStatement
- {
- /**
- * Actual SQL statement.
- */
- const char *sql;
- /**
- * Should we ignore errors?
- */
- int ignore_errors;
- };
- /**
- * Terminator for executable statement list.
- */
- #define GNUNET_SQ_EXECUTE_STATEMENT_END { NULL, GNUNET_SYSERR }
- /**
- * Create a `struct GNUNET_SQ_ExecuteStatement` where errors are fatal.
- *
- * @param sql actual SQL statement
- * @return initialized struct
- */
- struct GNUNET_SQ_ExecuteStatement
- GNUNET_SQ_make_execute (const char *sql);
- /**
- * Create a `struct GNUNET_SQ_ExecuteStatement` where errors should
- * be tolerated.
- *
- * @param sql actual SQL statement
- * @return initialized struct
- */
- struct GNUNET_SQ_ExecuteStatement
- GNUNET_SQ_make_try_execute (const char *sql);
- /**
- * Request execution of an array of statements @a es from Postgres.
- *
- * @param dbh database to execute the statements over
- * @param es #GNUNET_PQ_PREPARED_STATEMENT_END-terminated array of prepared
- * statements.
- * @return #GNUNET_OK on success (modulo statements where errors can be ignored)
- * #GNUNET_SYSERR on error
- */
- int
- GNUNET_SQ_exec_statements (sqlite3 *dbh,
- const struct GNUNET_SQ_ExecuteStatement *es);
- #endif /* GNUNET_SQ_LIB_H_ */
- /* end of include/gnunet_sq_lib.h */
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