-working a bit on DB, starting to adjust libtalerpq API, not done yet

src/include/taler_pq_lib.h

@@ -71,11 +71,46 @@ struct TALER_PQ_QueryParam
 #define TALER_PQ_QUERY_PARAM_PTR(x) TALER_PQ_QUERY_PARAM_PTR_SIZED(x, sizeof (*(x)))
 
 
+/**
+ * Different formats of results that can be extracted.
+ */
+enum TALER_PQ_ResultFormat
+{
+
+  /**
+   * List terminator.
+   */
+  TALER_PQ_RF_END,
+
+  /**
+   * We have a fixed-size result (binary blob, no endianess conversion).
+   */
+  TALER_PQ_RF_FIXED_BLOB,
+
+  /**
+   * We have a variable-size result (binary blob, no endianess conversion).
+   */
+  TALER_PQ_RF_VARSIZE_BLOB,
+
+  /**
+   * We have a currency amount (with endianess conversion).
+   * Data points to a `struct TALER_Amount`, size is not used.
+   */
+  TALER_PQ_RF_AMOUNT
+};
+
+
 /**
  * @brief Description of a DB result cell.
  */
 struct TALER_PQ_ResultSpec
 {
+
+  /**
+   * What is the format of the result?
+   */
+  enum TALER_PQ_ResultFormat format;
+
   /**
    * Destination for the data.
    */
@@ -104,7 +139,7 @@ struct TALER_PQ_ResultSpec
 /**
  * End of result parameter specification.
  */
-#define TALER_PQ_RESULT_SPEC_END { NULL, 0, NULL, NULL }
+#define TALER_PQ_RESULT_SPEC_END { TALER_PQ_RF_END, NULL, 0, NULL, NULL }
 
 /**
  * We expect a fixed-size result, with size given explicitly
@@ -113,7 +148,7 @@ struct TALER_PQ_ResultSpec
  * @param dst point to where to store the result
  * @param s number of bytes we should use in @a dst
  */
-#define TALER_PQ_RESULT_SPEC_SIZED(name, dst, s) { (void *) (dst), (s), (name), NULL }
+#define TALER_PQ_RESULT_SPEC_SIZED(name, dst, s) { TALER_PQ_RF_FIXED_BLOB,  (void *) (dst), (s), (name), NULL }
 
 
 /**
@@ -132,7 +167,16 @@ struct TALER_PQ_ResultSpec
  * @param dst where to store the result (of type void **), to be allocated
  * @param sptr pointer to a `size_t` for where to store the size of @a dst
  */
-#define TALER_PQ_RESULT_SPEC_VAR(name, dst, sptr) { (void *) (dst), 0, (name), sptr }
+#define TALER_PQ_RESULT_SPEC_VAR(name, dst, sptr) {TALER_PQ_RF_VARSIZE_BLOB, (void *) (dst), 0, (name), sptr }
+
+
+/**
+ * Currency amount expected.
+ *
+ * @param name name of the field in the table
+ * @param amount a `struct TALER_Amount` where to store the result
+ */
+#define TALER_PQ_RESULT_SPEC_AMOUNT(name, amount) {TALER_PQ_RF_AMOUNT, (void *) (&dst), 0, (name), sptr }
 
 
 /**

src/mintdb/plugin_mintdb_postgres.c

@@ -292,7 +292,15 @@ postgres_create_tables (void *cls,
           "("
           " session_hash BYTEA NOT NULL REFERENCES refresh_sessions (session_hash) "
           ",coin_pub BYTEA NOT NULL REFERENCES known_coins (coin_pub) "
+          ",coin_sig BYTEA NOT NULL "
           ",denom_pub BYTEA NOT NULL "
+          ",denom_sig BYTEA NOT NULL "
+          ",amount_value INT8 NOT NULL "
+          ",amount_fraction INT8 NOT NULL "
+          ",amount_currency VARCHAR(4) NOT NULL "
+          ",fee_value INT8 NOT NULL "
+          ",fee_fraction INT8 NOT NULL "
+          ",fee_currency VARCHAR(4) NOT NULL "
           ",oldcoin_index INT2 NOT NULL"
           ")");
   SQLEXEC("CREATE TABLE IF NOT EXISTS refresh_collectable"
@@ -513,7 +521,15 @@ postgres_prepare (PGconn *db_conn)
            " session_hash "
            ",oldcoin_index "
            ",coin_pub "
+           ",coin_sig "
            ",denom_pub "
+           ",denom_sig "
+           ",amount_value "
+           ",amount_fraction "
+           ",amount_currency "
+           ",fee_value "
+           ",fee_fraction "
+           ",fee_currency "
            ") "
            "VALUES ($1, $2, $3, $4) ",
            3, NULL);
@@ -528,7 +544,7 @@ postgres_prepare (PGconn *db_conn)
            "WHERE session_hash = $1 AND newcoin_index = $2",
            2, NULL);
   PREPARE ("get_refresh_melt",
-           "SELECT coin_pub "
+           "SELECT coin_pub,coin_sig,denom_pub,denom_sig,amount_value,amount_fraction,amount_currency,free_value,fee_fraction,fee_currency "
            "FROM refresh_melt "
            "WHERE session_hash = $1 AND oldcoin_index = $2",
            2, NULL);
@@ -1740,7 +1756,41 @@ postgres_get_refresh_melt (void *cls,
                            uint16_t oldcoin_index,
                            struct TALER_MINTDB_RefreshMelt *melt)
 {
+#if 0
   // FIXME: check logic!
+  uint16_t oldcoin_index_nbo = htons (oldcoin_index);
+  struct TALER_PQ_Query params[] = {
+    TALER_PQ_QUERY_PARAM_PTR (session_hash),
+    TALER_PQ_QUERY_PARAM_PTR (&oldcoin_index_nbo),
+    TALER_PQ_QUERY_PARAM_END
+  };
+  struct TALER_PQ_ResultSpec rs[] = {
+    TALER_PQ_RESULT_SPEC ("coin_pub", &melt->coin),
+    TALER_PQ_RESULT_SPEC ("coin_sig", &melt->coin_sig),
+    TALER_PQ_RESULT_SPEC ("denom_pub", &melt->coin),
+    TALER_PQ_RESULT_SPEC ("denom_sig", &melt->coin),
+    TALER_PQ_RESULT_SPEC_AMOUNT ("amount", &melt->amount_with_fee),
+    TALER_PQ_RESULT_SPEC_AMOUNT ("fee", &melt->melt_fee),
+    TALER_PQ_RESULT_SPEC_END
+  };
+
+  result = TALER_PQ_exec_prepared (session->conn,
+                                   "get_refresh_melt",
+                                   params);
+  if (0 == PQntuples (result))
+  {
+    PQclear (result);
+    return GNUNET_SYSERR;
+  }
+  if (1 != PQntuples (result))
+  {
+    PQclear (result);
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+#endif
+  melt->session_hash = *session_hash;
+
   GNUNET_break (0);
   return GNUNET_SYSERR;
 }