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-rw-r--r--src/pq/pq_result_helper.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/src/pq/pq_result_helper.c b/src/pq/pq_result_helper.c
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+/*
+ This file is part of TALER
+ Copyright (C) 2014, 2015, 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file pq/pq_result_helper.c
+ * @brief functions to initialize parameter arrays
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include "taler_pq_lib.h"
+
+
+/**
+ * Extract a currency amount from a query result according to the
+ * given specification.
+ *
+ * @param result the result to extract the amount from
+ * @param row which row of the result to extract the amount from (needed as results can have multiple rows)
+ * @param val_name name of the column with the amount's "value", must include the substring "_val".
+ * @param frac_name name of the column with the amount's "fractional" value, must include the substring "_frac".
+ * @param curr_name name of the column with the amount's currency name, must include the substring "_curr".
+ * @param[out] r_amount_nbo where to store the amount, in network byte order
+ * @return
+ * #GNUNET_YES if all results could be extracted
+ * #GNUNET_NO if at least one result was NULL
+ * #GNUNET_SYSERR if a result was invalid (non-existing field)
+ */
+static int
+extract_amount_nbo_helper (PGresult *result,
+ int row,
+ const char *val_name,
+ const char *frac_name,
+ const char *curr_name,
+ struct TALER_AmountNBO *r_amount_nbo)
+{
+ int val_num;
+ int frac_num;
+ int curr_num;
+ int len;
+
+ /* These checks are simply to check that clients obey by our naming
+ conventions, and not for any functional reason */
+ GNUNET_assert (NULL !=
+ strstr (val_name,
+ "_val"));
+ GNUNET_assert (NULL !=
+ strstr (frac_name,
+ "_frac"));
+ GNUNET_assert (NULL !=
+ strstr (curr_name,
+ "_curr"));
+ /* Set return value to invalid in case we don't finish */
+ memset (r_amount_nbo,
+ 0,
+ sizeof (struct TALER_AmountNBO));
+ val_num = PQfnumber (result,
+ val_name);
+ frac_num = PQfnumber (result,
+ frac_name);
+ curr_num = PQfnumber (result,
+ curr_name);
+ if ( (val_num < 0) ||
+ (frac_num < 0) ||
+ (curr_num < 0) )
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if ( (PQgetisnull (result,
+ row,
+ val_num)) ||
+ (PQgetisnull (result,
+ row,
+ frac_num)) ||
+ (PQgetisnull (result,
+ row,
+ curr_num)) )
+ {
+ GNUNET_break (0);
+ return GNUNET_NO;
+ }
+ /* Note that Postgres stores value in NBO internally,
+ so no conversion needed in this case */
+ r_amount_nbo->value = *(uint64_t *) PQgetvalue (result,
+ row,
+ val_num);
+ r_amount_nbo->fraction = *(uint32_t *) PQgetvalue (result,
+ row,
+ frac_num);
+ len = GNUNET_MIN (TALER_CURRENCY_LEN - 1,
+ PQgetlength (result,
+ row,
+ curr_num));
+ memcpy (r_amount_nbo->currency,
+ PQgetvalue (result,
+ row,
+ curr_num),
+ len);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Extract data from a Postgres database @a result at row @a row.
+ *
+ * @param cls closure
+ * @param result where to extract data from
+ * @param int row to extract data from
+ * @param fname name (or prefix) of the fields to extract 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_NO if at least one result was NULL
+ * #GNUNET_SYSERR if a result was invalid (non-existing field)
+ */
+static int
+extract_amount_nbo (void *cls,
+ PGresult *result,
+ int row,
+ const char *fname,
+ size_t *dst_size,
+ void *dst)
+{
+ char *val_name;
+ char *frac_name;
+ char *curr_name;
+ int ret;
+
+ GNUNET_asprintf (&val_name,
+ "%s_val",
+ fname);
+ GNUNET_asprintf (&frac_name,
+ "%s_frac",
+ fname);
+ GNUNET_asprintf (&curr_name,
+ "%s_curr",
+ fname);
+ ret = extract_amount_nbo_helper (result,
+ row,
+ val_name,
+ frac_name,
+ curr_name,
+ dst);
+ GNUNET_free (val_name);
+ GNUNET_free (frac_name);
+ GNUNET_free (curr_name);
+ return ret;
+}
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param name name of the field in the table
+ * @param[out] amount where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_PQ_ResultSpec
+TALER_PQ_result_spec_amount_nbo (const char *name,
+ struct TALER_AmountNBO *amount)
+{
+ struct GNUNET_PQ_ResultSpec res =
+ { &extract_amount_nbo, NULL, NULL,
+ (void *) amount, sizeof (*amount),
+ name, NULL };
+ return res;
+}
+
+
+/**
+ * Extract data from a Postgres database @a result at row @a row.
+ *
+ * @param cls closure
+ * @param result where to extract data from
+ * @param int row to extract data from
+ * @param fname name (or prefix) of the fields to extract 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_NO if at least one result was NULL
+ * #GNUNET_SYSERR if a result was invalid (non-existing field)
+ */
+static int
+extract_amount (void *cls,
+ PGresult *result,
+ int row,
+ const char *fname,
+ size_t *dst_size,
+ void *dst)
+{
+ struct TALER_Amount *r_amount = dst;
+ char *val_name;
+ char *frac_name;
+ char *curr_name;
+ struct TALER_AmountNBO amount_nbo;
+ int ret;
+
+ GNUNET_asprintf (&val_name,
+ "%s_val",
+ fname);
+ GNUNET_asprintf (&frac_name,
+ "%s_frac",
+ fname);
+ GNUNET_asprintf (&curr_name,
+ "%s_curr",
+ fname);
+ ret = extract_amount_nbo_helper (result,
+ row,
+ val_name,
+ frac_name,
+ curr_name,
+ &amount_nbo);
+ TALER_amount_ntoh (r_amount,
+ &amount_nbo);
+ GNUNET_free (val_name);
+ GNUNET_free (frac_name);
+ GNUNET_free (curr_name);
+ return ret;
+}
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param name name of the field in the table
+ * @param[out] amount where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_PQ_ResultSpec
+TALER_PQ_result_spec_amount (const char *name,
+ struct TALER_Amount *amount)
+{
+ struct GNUNET_PQ_ResultSpec res =
+ { &extract_amount, NULL, NULL,
+ (void *) amount, sizeof (*amount),
+ name, NULL };
+ return res;
+}
+
+
+/**
+ * Extract data from a Postgres database @a result at row @a row.
+ *
+ * @param cls closure
+ * @param result where to extract data from
+ * @param int row to extract data from
+ * @param fname name (or prefix) of the fields to extract 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_NO if at least one result was NULL
+ * #GNUNET_SYSERR if a result was invalid (non-existing field)
+ */
+static int
+extract_json (void *cls,
+ PGresult *result,
+ int row,
+ const char *fname,
+ size_t *dst_size,
+ void *dst)
+{
+ json_t **j_dst = dst;
+ const char *res;
+ int fnum;
+ json_error_t json_error;
+ size_t slen;
+
+ fnum = PQfnumber (result,
+ fname);
+ if (fnum < 0)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Field `%s' does not exist in result\n",
+ fname);
+ return GNUNET_SYSERR;
+ }
+ if (PQgetisnull (result,
+ row,
+ fnum))
+ return GNUNET_NO;
+ slen = PQgetlength (result,
+ row,
+ fnum);
+ res = (const char *) PQgetvalue (result,
+ row,
+ fnum);
+ *j_dst = json_loadb (res,
+ slen,
+ JSON_REJECT_DUPLICATES,
+ &json_error);
+ if (NULL == *j_dst)
+ {
+ TALER_json_warn (json_error);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to parse JSON result for field `%s'\n",
+ fname);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called to clean up memory allocated
+ * by a #GNUNET_PQ_ResultConverter.
+ *
+ * @param cls closure
+ * @param rd result data to clean up
+ */
+static void
+clean_json (void *cls,
+ void *rd)
+{
+ json_t **dst = rd;
+
+ if (NULL != *dst)
+ {
+ json_decref (*dst);
+ *dst = NULL;
+ }
+}
+
+
+/**
+ * json_t expected.
+ *
+ * @param name name of the field in the table
+ * @param[out] jp where to store the result
+ * @return array entry for the result specification to use
+ */
+struct GNUNET_PQ_ResultSpec
+TALER_PQ_result_spec_json (const char *name,
+ json_t **jp)
+{
+ struct GNUNET_PQ_ResultSpec res =
+ { &extract_json, &clean_json, NULL,
+ (void *) jp, 0,
+ name, NULL };
+ return res;
+}
+
+/* end of pq_result_helper.c */
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