initial import of merchant logic (FTBFS)

1 files changed, 347 insertions, 0 deletions

diff --git a/src/merchant/merchant_db.c b/src/merchant/merchant_db.c
new file mode 100644
index 00000000..1b2fe720
--- /dev/null
+++ b/src/merchant/merchant_db.c
@@ -0,0 +1,347 @@
+/*
+  This file is part of TALER
+  (C) 2014 Christian Grothoff (and other contributing authors)
+
+  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 merchant/merchant_db.c
+ * @brief database helper functions used by the merchant
+ * @author Sree Harsha Totakura <sreeharsha@totakura.in>
+ */
+
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <taler/taler_util.h>
+#include <taler/taler_db_lib.h>
+#include "merchant_db.h"
+
+
+#define PQSQL_strerror(kind, cmd, res)                \
+  GNUNET_log_from (kind, "merchant-db",                     \
+                   "SQL %s failed at %s:%u with error: %s", \
+                   cmd, __FILE__, __LINE__, PQresultErrorMessage (res));
+
+/**
+ * Shorthand for exit jumps.
+ */
+#define EXITIF(cond)                                              \
+  do {                                                            \
+    if (cond) { GNUNET_break (0); goto EXITIF_exit; }             \
+  } while (0)
+
+
+/**
+ * Connect to postgresql database
+ *
+ * @param cfg the configuration handle
+ * @return connection to the postgresql database; NULL upon error
+ */
+PGconn *
+MERCHANT_DB_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  return GNUNET_POSTGRES_connect (cfg, "merchant-db");
+}
+
+
+/**
+ * Disconnect from the database
+ *
+ * @param conn database handle to close
+ */
+void
+MERCHANT_DB_disconnect (PGconn *conn)
+{
+  PQfinish (conn);
+}
+
+
+/**
+ * Initialise merchant tables
+ *
+ * @param conn the connection handle to postgres db.
+ * @param tmp GNUNET_YES if the tables are to be made temporary i.e. their
+ *          contents are dropped when the @a conn is closed
+ * @return GNUNET_OK upon success; GNUNET_SYSERR upon failure
+ */
+int
+MERCHANT_DB_initialise (PGconn *conn, int tmp)
+{
+  const char *tmp_str = (1 == tmp) ? "TEMPORARY" : "";
+  char *sql;
+  PGresult *res;
+  ExecStatusType status;
+  int ret;
+
+  res = NULL;
+  (void) GNUNET_asprintf (&sql,
+                          "BEGIN TRANSACTION;"
+                          "CREATE %1$s TABLE IF NOT EXISTS contracts ("
+                          "transaction_id SERIAL8 PRIMARY KEY,"
+                          "amount INT4 NOT NULL,"
+                          "amount_fraction INT4 NOT NULL,"
+                          "description TEXT NOT NULL,"
+                          "nounce BYTEA NOT NULL,"
+                          "expiry INT8 NOT NULL,"
+                          "product INT8 NOT NULL);"
+                          "CREATE %1$s TABLE IF NOT EXISTS checkouts ("
+                          "coin_pub BYTEA PRIMARY KEY,"
+                          "transaction_id INT8 REFERENCES contracts(transaction_id),"
+                          "amount INT4 NOT NULL,"
+                          "amount_fraction INT4 NOT NULL,"
+                          "coin_sig BYTEA NOT NULL);",
+                          tmp_str);
+  ret = GNUNET_POSTGRES_exec (conn, sql);
+  (void) GNUNET_POSTGRES_exec (conn,
+                               (GNUNET_OK == ret) ? "COMMIT;" : "ROLLBACK");
+  GNUNET_free (sql);
+  if (GNUNET_OK != ret)
+    return ret;
+
+  while (NULL != (res = PQgetResult (conn)))
+  {
+    status = PQresultStatus (res);
+    PQclear (res);
+  }
+
+  EXITIF (NULL == (res = PQprepare
+                   (conn,
+                    "contract_create",
+                    "INSERT INTO contracts"
+                    "(amount, amount_fraction, description,"
+                    "nounce, expiry, product) VALUES"
+                    "($1, $2, $3, $4, $5, $6)"
+                    "RETURNING transaction_id",
+                    6, NULL)));
+  EXITIF (PGRES_COMMAND_OK != (status = PQresultStatus(res)));
+  PQclear (res);
+
+  EXITIF (NULL == (res = PQprepare
+                   (conn,
+                    "get_contract_product",
+                    "SELECT ("
+                    "product"
+                    ") FROM contracts "
+                    "WHERE ("
+                    "transaction_id=$1"
+                    ")",
+                    1, NULL)));
+  EXITIF (PGRES_COMMAND_OK != (status = PQresultStatus(res)));
+  PQclear (res);
+
+  EXITIF (NULL == (res = PQprepare
+                   (conn,
+                    "checkout_create",
+                    "INSERT INTO checkouts ("
+                    "coin_pub,"
+                    "transaction_id,"
+                    "amount,"
+                    "amount_fraction,"
+                    "coin_sig"
+                    ") VALUES ("
+                    "$1, $2, $3, $4, $5"
+                    ")",
+                    5, NULL)));
+  EXITIF (PGRES_COMMAND_OK != (status = PQresultStatus (res)));
+  PQclear (res);
+
+  EXITIF (NULL == (res = PQprepare
+                   (conn,
+                    "get_checkout_product",
+                    "SELECT ("
+                    "product"
+                    ") FROM contracts "
+                    "WHERE "
+                    "transaction_id IN ("
+                    "SELECT (transaction_id) FROM checkouts "
+                    "WHERE coin_pub=$1"
+                    ")",
+                    1, NULL)));
+  EXITIF (PGRES_COMMAND_OK != (status = PQresultStatus (res)));
+  PQclear (res);
+
+  return GNUNET_OK;
+
+ EXITIF_exit:
+  if (NULL != res)
+  {
+    PQSQL_strerror (GNUNET_ERROR_TYPE_ERROR, "PQprepare", res);
+    PQclear (res);
+  }
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Inserts a contract record into the database and if successfull returns the
+ * serial number of the inserted row.
+ *
+ * @param conn the database connection
+ * @param expiry the time when the contract will expire
+ * @param amount the taler amount corresponding to the contract
+ * @param desc descripition of the contract
+ * @param nounce a random 64-bit nounce
+ * @param product description to identify a product
+ * @return -1 upon error; the serial id of the inserted contract upon success
+ */
+long long
+MERCHANT_DB_contract_create (PGconn *conn,
+                             struct GNUNET_TIME_Absolute expiry,
+                             struct TALER_Amount *amount,
+                             const char *desc,
+                             uint64_t nounce,
+                             uint64_t product)
+{
+  PGresult *res;
+  uint64_t expiry_ms_nbo;
+  uint32_t value_nbo;
+  uint32_t fraction_nbo;
+  uint64_t nounce_nbo;
+  ExecStatusType status;
+  long long id;
+  struct TALER_DB_QueryParam params[] = {
+    TALER_DB_QUERY_PARAM_PTR (&value_nbo),
+    TALER_DB_QUERY_PARAM_PTR (&fraction_nbo),
+    TALER_DB_QUERY_PARAM_PTR_SIZED (desc, strlen(desc)),
+    TALER_DB_QUERY_PARAM_PTR (&nounce_nbo),
+    TALER_DB_QUERY_PARAM_PTR (&expiry_ms_nbo),
+    TALER_DB_QUERY_PARAM_PTR (&product),
+    TALER_DB_QUERY_PARAM_END
+  };
+  struct TALER_DB_ResultSpec rs[] = {
+    TALER_DB_RESULT_SPEC("transaction_id", &id),
+    TALER_DB_RESULT_SPEC_END
+  };
+
+  expiry_ms_nbo = GNUNET_htonll (expiry.abs_value_us);
+  value_nbo = htonl (amount->value);
+  fraction_nbo = htonl (amount->fraction);
+  nounce_nbo = GNUNET_htonll (nounce);
+  product = GNUNET_htonll (product);
+  res = TALER_DB_exec_prepared (conn, "contract_create", params);
+  status = PQresultStatus (res);
+  EXITIF (PGRES_TUPLES_OK != status);
+  EXITIF (1 != PQntuples (res));
+  EXITIF (GNUNET_YES != TALER_DB_extract_result (res, rs, 0));
+  PQclear (res);
+  return GNUNET_ntohll ((uint64_t) id);
+
+ EXITIF_exit:
+  PQclear (res);
+  return -1;
+}
+
+long long
+MERCHANT_DB_get_contract_product (PGconn *conn,
+                                  uint64_t contract_id)
+{
+  PGresult *res;
+  int64_t product;
+  ExecStatusType status;
+  struct TALER_DB_QueryParam params[] = {
+    TALER_DB_QUERY_PARAM_PTR (&contract_id),
+    TALER_DB_QUERY_PARAM_END
+  };
+  struct TALER_DB_ResultSpec rs[] = {
+    TALER_DB_RESULT_SPEC("product", &product),
+    TALER_DB_RESULT_SPEC_END
+  };
+
+  contract_id = GNUNET_htonll (contract_id);
+  res = TALER_DB_exec_prepared (conn, "get_contract_product", params);
+  status = PQresultStatus (res);
+  EXITIF (PGRES_TUPLES_OK != status);
+  EXITIF (1 != PQntuples (res));
+  EXITIF (GNUNET_YES != TALER_DB_extract_result (res, rs, 0));
+  PQclear (res);
+  return GNUNET_ntohll ((uint64_t) product);
+
+ EXITIF_exit:
+  PQclear (res);
+  return -1;
+}
+
+unsigned int
+MERCHANT_DB_checkout_create (PGconn *conn,
+                             struct GNUNET_CRYPTO_EddsaPublicKey *coin_pub,
+                             uint64_t transaction_id,
+                             struct TALER_Amount *amount,
+                             struct GNUNET_CRYPTO_EddsaSignature *coin_sig)
+{
+  PGresult *res;
+  ExecStatusType status;
+  uint32_t value_nbo;
+  uint32_t fraction_nbo;
+  struct TALER_DB_QueryParam params[] = {
+    TALER_DB_QUERY_PARAM_PTR (coin_pub),
+    TALER_DB_QUERY_PARAM_PTR (&transaction_id),
+    TALER_DB_QUERY_PARAM_PTR (&value_nbo),
+    TALER_DB_QUERY_PARAM_PTR (&fraction_nbo),
+    TALER_DB_QUERY_PARAM_PTR (coin_sig),
+    TALER_DB_QUERY_PARAM_END
+  };
+
+  transaction_id = GNUNET_htonll (transaction_id);
+  value_nbo = htonl (amount->value);
+  fraction_nbo = htonl (amount->fraction);
+  res = TALER_DB_exec_prepared (conn, "checkout_create", params);
+  status = PQresultStatus (res);
+  EXITIF (PGRES_COMMAND_OK != status);
+  PQclear (res);
+  return GNUNET_OK;
+
+ EXITIF_exit:
+  PQclear (res);
+  return GNUNET_SYSERR;
+}
+
+
+long long
+MERCHANT_DB_get_checkout_product (PGconn *conn,
+                                  struct GNUNET_CRYPTO_EddsaPublicKey *coin_pub)
+{
+  PGresult *res;
+  ExecStatusType status;
+  uint64_t product;
+  struct TALER_DB_QueryParam params[] = {
+    TALER_DB_QUERY_PARAM_PTR (coin_pub),
+    TALER_DB_QUERY_PARAM_END
+  };
+  struct TALER_DB_ResultSpec rs[] = {
+    TALER_DB_RESULT_SPEC("product", &product),
+    TALER_DB_RESULT_SPEC_END
+  };
+
+  product = -1;
+  res = TALER_DB_exec_prepared (conn, "get_checkout_product", params);
+  status = PQresultStatus (res);
+  EXITIF (PGRES_TUPLES_OK != status);
+  if (0 == PQntuples (res))
+  {
+    char *coin_pub_enc;
+    coin_pub_enc = GNUNET_CRYPTO_eddsa_public_key_to_string (coin_pub);
+    LOG_DEBUG ("Checkout not found for given coin: %s\n",
+               coin_pub_enc);
+    GNUNET_free (coin_pub_enc);
+    goto EXITIF_exit;
+  }
+  EXITIF (1 != PQntuples (res));
+  EXITIF (GNUNET_YES != TALER_DB_extract_result (res, rs, 0));
+  PQclear (res);
+  return GNUNET_ntohll ((uint64_t) product);
+
+ EXITIF_exit:
+  PQclear (res);
+  return -1;
+}
+/* end of merchant-db.c */