move to new libgnunetpq library, simplifying libtalerpq

1 files changed, 208 insertions, 0 deletions

diff --git a/src/pq/pq_query_helper.c b/src/pq/pq_query_helper.c
new file mode 100644
index 000000000..5d2e9ce06
--- /dev/null
+++ b/src/pq/pq_query_helper.c
@@ -0,0 +1,208 @@
+/*
+  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_query_helper.c
+ * @brief helper functions for Taler-specific libpq (PostGres) interactions
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ * @author Florian Dold
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_pq_lib.h>
+#include "taler_pq_lib.h"
+
+
+/**
+ * Function called to convert input argument into SQL parameters.
+ *
+ * @param cls closure
+ * @param data pointer to input argument, here a `struct TALER_AmountNBO`
+ * @param data_len number of bytes in @a data (if applicable)
+ * @param[out] param_values SQL data to set
+ * @param[out] param_lengths SQL length data to set
+ * @param[out] param_formats SQL format data to set
+ * @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
+ * @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
+ * @param scratch_length number of entries left in @a scratch
+ * @return -1 on error, number of offsets used in @a scratch otherwise
+ */
+static int
+qconv_amount_nbo (void *cls,
+		  const void *data,
+		  size_t data_len,
+		  void *param_values[],
+		  int param_lengths[],
+		  int param_formats[],
+		  unsigned int param_length,
+		  void *scratch[],
+		  unsigned int scratch_length)
+{
+  const struct TALER_AmountNBO *amount = data;
+  unsigned int off = 0;
+
+  GNUNET_assert (3 == param_length);
+  param_values[off] = (void *) &amount->value;
+  param_lengths[off] = sizeof (amount->value);
+  param_formats[off] = 1;
+  off++;
+  param_values[off] = (void *) &amount->fraction;
+  param_lengths[off] = sizeof (amount->fraction);
+  param_formats[off] = 1;
+  off++;
+  param_values[off] = (void *) amount->currency;
+  param_lengths[off] = strlen (amount->currency);
+  param_formats[off] = 1;
+  return 0;
+}
+
+
+/**
+ * Generate query parameter for a currency, consisting of the three
+ * components "value", "fraction" and "currency" in this order. The
+ * types must be a 64-bit integer, 32-bit integer and a
+ * #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
+ *
+ * @param x pointer to the query parameter to pass
+ * @return array entry for the query parameters to use
+ */
+struct GNUNET_PQ_QueryParam
+TALER_PQ_query_param_amount_nbo (const struct TALER_AmountNBO *x)
+{
+  struct GNUNET_PQ_QueryParam res =
+    { &qconv_amount_nbo, NULL, x, sizeof (*x), 3 };
+  return res;
+}
+
+
+/**
+ * Function called to convert input argument into SQL parameters.
+ *
+ * @param cls closure
+ * @param data pointer to input argument, here a `struct TALER_Amount`
+ * @param data_len number of bytes in @a data (if applicable)
+ * @param[out] param_values SQL data to set
+ * @param[out] param_lengths SQL length data to set
+ * @param[out] param_formats SQL format data to set
+ * @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
+ * @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
+ * @param scratch_length number of entries left in @a scratch
+ * @return -1 on error, number of offsets used in @a scratch otherwise
+ */
+static int
+qconv_amount (void *cls,
+	      const void *data,
+	      size_t data_len,
+	      void *param_values[],
+	      int param_lengths[],
+	      int param_formats[],
+	      unsigned int param_length,
+	      void *scratch[],
+	      unsigned int scratch_length)
+{
+  const struct TALER_Amount *amount_hbo = data;
+  struct TALER_AmountNBO *amount;
+
+  amount = GNUNET_new (struct TALER_AmountNBO);
+  scratch[0] = amount;
+  TALER_amount_hton (amount,
+		     amount_hbo);
+  qconv_amount_nbo (cls,
+		    amount,
+		    sizeof (struct TALER_AmountNBO),
+		    param_values,
+		    param_lengths,
+		    param_formats,
+		    param_length,
+		    &scratch[1],
+		    scratch_length - 1);
+  return 1;
+}
+
+
+/**
+ * Generate query parameter for a currency, consisting of the three
+ * components "value", "fraction" and "currency" in this order. The
+ * types must be a 64-bit integer, 32-bit integer and a
+ * #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
+ *
+ * @param x pointer to the query parameter to pass
+ * @return array entry for the query parameters to use
+ */
+struct GNUNET_PQ_QueryParam
+TALER_PQ_query_param_amount (const struct TALER_Amount *x)
+{
+  struct GNUNET_PQ_QueryParam res =
+    { &qconv_amount, NULL, x, sizeof (*x), 3 };
+  return res;
+}
+
+
+/**
+ * Function called to convert input argument into SQL parameters.
+ *
+ * @param cls closure
+ * @param data pointer to input argument, here a `json_t *`
+ * @param data_len number of bytes in @a data (if applicable)
+ * @param[out] param_values SQL data to set
+ * @param[out] param_lengths SQL length data to set
+ * @param[out] param_formats SQL format data to set
+ * @param param_length number of entries available in the @a param_values, @a param_lengths and @a param_formats arrays
+ * @param[out] scratch buffer for dynamic allocations (to be done via #GNUNET_malloc()
+ * @param scratch_length number of entries left in @a scratch
+ * @return -1 on error, number of offsets used in @a scratch otherwise
+ */
+static int
+qconv_json (void *cls,
+	    const void *data,
+	    size_t data_len,
+	    void *param_values[],
+	    int param_lengths[],
+	    int param_formats[],
+	    unsigned int param_length,
+	    void *scratch[],
+	    unsigned int scratch_length)
+{
+  const json_t *json = data;
+  char *str;
+  
+  str = json_dumps (json, JSON_COMPACT);
+  if (NULL == str)
+    return -1;
+  scratch[0] = str;
+  param_values[0] = (void *) str;
+  param_lengths[0] = strlen (str);
+  param_formats[0] = 1;
+  return 1;
+}
+
+
+/**
+ * Generate query parameter for a JSON object (stored as a string
+ * in the DB).
+ *
+ * @param x pointer to the json object to pass
+ */
+struct GNUNET_PQ_QueryParam
+TALER_PQ_query_param_json (const json_t *x)
+{
+  struct GNUNET_PQ_QueryParam res =
+    { &qconv_json, NULL, x, 0, 1 };
+  return res;
+}
+
+
+/* end of pq/pq_query_helper.c */