eliminating obsolete KnownCoin APIs

3 files changed, 21 insertions, 301 deletions

diff --git a/src/mint/mint_db.c b/src/mint/mint_db.c
index a9595f2eb..c4d1ff743 100644
--- a/src/mint/mint_db.c
+++ b/src/mint/mint_db.c
@@ -581,98 +581,6 @@ TALER_MINT_DB_insert_refresh_order (PGconn *db_conn,
 
 
 int
-TALER_MINT_DB_get_known_coin (PGconn *db_conn,
-                              const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub,
-                              struct KnownCoin *known_coin)
-{
-  int res;
-  struct TALER_DB_QueryParam params[] = {
-    TALER_DB_QUERY_PARAM_PTR(coin_pub),
-    TALER_DB_QUERY_PARAM_END
-  };
-
-  PGresult *result = TALER_DB_exec_prepared (db_conn, "get_known_coin", params);
-
-  if (PGRES_TUPLES_OK != PQresultStatus (result))
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Query failed: %s\n",
-                PQresultErrorMessage (result));
-    PQclear (result);
-    return GNUNET_SYSERR;
-  }
-
-  if (0 == PQntuples (result))
-    return GNUNET_NO;
-
-  GNUNET_assert (1 == PQntuples (result));
-
-  /* extract basic information about the known coin */
-
-  {
-    struct TALER_DB_ResultSpec rs[] = {
-      TALER_DB_RESULT_SPEC("coin_pub", &known_coin->public_info.coin_pub),
-      TALER_DB_RESULT_SPEC("denom_pub", &known_coin->public_info.denom_pub),
-      TALER_DB_RESULT_SPEC("denom_sig", &known_coin->public_info.denom_sig),
-      TALER_DB_RESULT_SPEC_END
-    };
-
-    if (GNUNET_OK != (res = TALER_DB_extract_result (result, rs, 0)))
-    {
-      GNUNET_break (0);
-      PQclear (result);
-      return GNUNET_SYSERR;
-    }
-  }
-
-  /* extract the expended amount of the coin */
-
-  if (GNUNET_OK !=
-      TALER_DB_extract_amount (result,
-                               0,
-                               "expended_value",
-                               "expended_fraction",
-                               "expended_currency",
-                               &known_coin->expended_balance))
-  {
-    GNUNET_break (0);
-    PQclear (result);
-    return GNUNET_SYSERR;
-  }
-
-  /* extract the refresh session of the coin or mark it as missing */
-
-  {
-    struct TALER_DB_ResultSpec rs[] = {
-      TALER_DB_RESULT_SPEC("refresh_session_pub", &known_coin->refresh_session_pub),
-      TALER_DB_RESULT_SPEC_END
-    };
-
-    if (GNUNET_SYSERR == (res = TALER_DB_extract_result (result, rs, 0)))
-    {
-      GNUNET_break (0);
-      PQclear (result);
-      return GNUNET_SYSERR;
-    }
-    if (GNUNET_NO == res)
-    {
-      known_coin->is_refreshed = GNUNET_NO;
-      memset (&known_coin->refresh_session_pub,
-              0,
-              sizeof (struct GNUNET_CRYPTO_EddsaPublicKey));
-    }
-    else
-    {
-      known_coin->is_refreshed = GNUNET_YES;
-    }
-  }
-
-  PQclear (result);
-  return GNUNET_YES;
-}
-
-
-int
 TALER_MINT_DB_set_commit_signature (PGconn *db_conn,
                                     const struct GNUNET_CRYPTO_EddsaPublicKey *session_pub,
                                     const struct GNUNET_CRYPTO_EddsaSignature *commit_sig)
@@ -711,112 +619,6 @@ TALER_MINT_DB_set_reveal_ok (PGconn *db_conn,
 }
 
 
-int
-TALER_MINT_DB_update_known_coin (PGconn *db_conn,
-                                 const struct KnownCoin *known_coin)
-{
-  struct TALER_AmountNBO expended_nbo = TALER_amount_hton (known_coin->expended_balance);
-  struct TALER_DB_QueryParam params[] = {
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.coin_pub),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.denom_pub),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.denom_sig),
-    TALER_DB_QUERY_PARAM_PTR(&expended_nbo.value),
-    TALER_DB_QUERY_PARAM_PTR(&expended_nbo.fraction),
-    TALER_DB_QUERY_PARAM_PTR_SIZED(expended_nbo.currency, strlen (expended_nbo.currency)),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->refresh_session_pub),
-    TALER_DB_QUERY_PARAM_END
-  };
-
-  if (GNUNET_NO == known_coin->is_refreshed)
-  {
-    // Mind the magic index!
-    params[6].data = NULL;
-    params[6].size = 0;
-  }
-
-  PGresult *result = TALER_DB_exec_prepared (db_conn, "update_known_coin", params);
-
-  if (PGRES_COMMAND_OK != PQresultStatus (result))
-  {
-    break_db_err (result);
-    PQclear (result);
-    return GNUNET_SYSERR;
-  }
-
-  if (0 != strcmp ("1", PQcmdTuples (result)))
-  {
-    PQclear (result);
-    // return 'no' here (don't fail) so that we can
-    // insert if update fails (=> "upsert")
-    return GNUNET_NO;
-  }
-
-  PQclear (result);
-  return GNUNET_YES;
-}
-
-int
-TALER_MINT_DB_insert_known_coin (PGconn *db_conn,
-                                 const struct KnownCoin *known_coin)
-{
-  struct TALER_AmountNBO expended_nbo = TALER_amount_hton (known_coin->expended_balance);
-  struct TALER_DB_QueryParam params[] = {
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.coin_pub),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.denom_pub),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->public_info.denom_sig),
-    TALER_DB_QUERY_PARAM_PTR(&expended_nbo.value),
-    TALER_DB_QUERY_PARAM_PTR(&expended_nbo.fraction),
-    TALER_DB_QUERY_PARAM_PTR_SIZED(&expended_nbo.currency, strlen (expended_nbo.currency)),
-    TALER_DB_QUERY_PARAM_PTR(&known_coin->refresh_session_pub),
-    TALER_DB_QUERY_PARAM_END
-  };
-
-  if (GNUNET_NO == known_coin->is_refreshed)
-  {
-    // Mind the magic index!
-    params[6].data = NULL;
-    params[6].size = 0;
-  }
-
-  PGresult *result = TALER_DB_exec_prepared (db_conn, "insert_known_coin", params);
-
-  if (PGRES_COMMAND_OK != PQresultStatus (result))
-  {
-    break_db_err (result);
-    PQclear (result);
-    return GNUNET_SYSERR;
-  }
-
-  if (0 != strcmp ("1", PQcmdTuples (result)))
-  {
-    PQclear (result);
-    // return 'no' here (don't fail) so that we can
-    // update if insert fails (=> "upsert")
-    return GNUNET_NO;
-  }
-
-  PQclear (result);
-  return GNUNET_YES;
-}
-
-
-int
-TALER_MINT_DB_upsert_known_coin (PGconn *db_conn,
-                                 struct KnownCoin *known_coin)
-{
-  int ret;
-  ret = TALER_MINT_DB_update_known_coin (db_conn, known_coin);
-  if (GNUNET_SYSERR == ret)
-  {
-    GNUNET_break (0);
-    return GNUNET_SYSERR;
-  }
-  if (GNUNET_YES == ret)
-    return GNUNET_YES;
-  return TALER_MINT_DB_insert_known_coin (db_conn, known_coin);
-}
-
-
 struct GNUNET_CRYPTO_rsa_PublicKey *
 TALER_MINT_DB_get_refresh_order (PGconn *db_conn,
                                  uint16_t newcoin_index,
diff --git a/src/mint/mint_db.h b/src/mint/mint_db.h
index ae3f69efb..5762656d0 100644
--- a/src/mint/mint_db.h
+++ b/src/mint/mint_db.h
@@ -44,50 +44,6 @@ TALER_MINT_DB_insert_refresh_order (PGconn *db_conn,
 
 
 
-
-
-
-/**
- * FIXME
- */
-struct KnownCoin
-{
-  struct TALER_CoinPublicInfo public_info;
-
-  /**
-   * Refreshing session, only valid if
-   * is_refreshed==1.
-   */
-  struct GNUNET_CRYPTO_EddsaPublicKey refresh_session_pub;
-
-  struct TALER_Amount expended_balance;
-
-  int is_refreshed;
-
-};
-
-
-int
-TALER_MINT_DB_get_known_coin (PGconn *db_conn,
-                              const struct GNUNET_CRYPTO_EcdsaPublicKey *coin_pub,
-                              struct KnownCoin *known_coin);
-
-// FIXME: what does 'upsert' even mean!?
-int
-TALER_MINT_DB_upsert_known_coin (PGconn *db_conn,
-                                 struct KnownCoin *known_coin);
-
-
-int
-TALER_MINT_DB_insert_known_coin (PGconn *db_conn,
-                                 const struct KnownCoin *known_coin);
-
-
-
-
-
-
-
 struct GNUNET_CRYPTO_rsa_PublicKey *
 TALER_MINT_DB_get_refresh_order (PGconn *db_conn,
                                  uint16_t newcoin_index,
diff --git a/src/mint/taler-mint-httpd_db.c b/src/mint/taler-mint-httpd_db.c
index 8ddb17ab7..0da207747 100644
--- a/src/mint/taler-mint-httpd_db.c
+++ b/src/mint/taler-mint-httpd_db.c
@@ -33,10 +33,9 @@
  *   + check for leaks
  *   + check low-level API
  * - /refresh/link:
- *   + properly check all conditions and handle errors
- *   + properly check transaction logic
- *   + check for leaks
  *   + check low-level API
+ *   + separate DB logic from response generation
+ *   + check for leaks
  */
 #include "platform.h"
 #include <pthread.h>
@@ -475,7 +474,7 @@ refresh_accept_denoms (struct MHD_Connection *connection,
  * @param session_pub the refresh session's public key
  * @param coin_count number of coins in @a coin_public_infos to melt
  * @param coin_public_infos the coins to melt
- * @param r_melt_balance FIXME
+ * @param r_melt_balance[OUT] FIXME (#3636: check earlier, pass expected value IN, not OUT!)
  * @return #GNUNET_OK on success,
  *         #GNUNET_NO if an error message was generated,
  *         #GNUNET_SYSERR on internal errors (no response generated)
@@ -490,68 +489,34 @@ refresh_accept_melts (struct MHD_Connection *connection,
                       struct TALER_Amount *r_melt_balance)
 {
   size_t i;
-  int res;
 
   memset (r_melt_balance, 0, sizeof (struct TALER_Amount));
 
   for (i = 0; i < coin_count; i++)
   {
     struct TALER_MINT_DenomKeyIssue *dki;
-    struct KnownCoin known_coin;
+    struct TALER_MINT_DB_TransactionList *tl;
     // money the customer gets by melting the current coin
     struct TALER_Amount coin_gain;
     struct RefreshMelt melt;
 
-    dki = &(TALER_MINT_get_denom_key (key_state,
-                                      coin_public_infos[i].denom_pub)->issue);
+    dki = &TALER_MINT_get_denom_key (key_state,
+                                     coin_public_infos[i].denom_pub)->issue;
 
     if (NULL == dki)
       return (MHD_YES ==
               TALER_MINT_reply_json_pack (connection,
                                           MHD_HTTP_NOT_FOUND,
                                           "{s:s}",
-                                          "error", "denom not found"))
+                                          "error",
+                                          "denom not found"))
         ? GNUNET_NO : GNUNET_SYSERR;
 
-
-    res = TALER_MINT_DB_get_known_coin (db_conn,
-                                        &coin_public_infos[i].coin_pub,
-                                        &known_coin);
-
-    if (GNUNET_SYSERR == res)
-    {
-      GNUNET_break (0);
-      return GNUNET_SYSERR;
-    }
-
-    if (GNUNET_YES == res)
-    {
-      if (GNUNET_YES == known_coin.is_refreshed)
-        return (MHD_YES ==
-                TALER_MINT_reply_json_pack (connection,
-                                            MHD_HTTP_NOT_FOUND,
-                                            "{s:s}",
-                                            "error",
-                                            "coin already refreshed"))
-          ? GNUNET_NO : GNUNET_SYSERR;
-    }
-    else
-    {
-      known_coin.expended_balance = mint_amount_native_zero ();
-      known_coin.public_info = coin_public_infos[i];
-    }
-
-    known_coin.is_refreshed = GNUNET_YES;
-    known_coin.refresh_session_pub = *session_pub;
-
-    if (GNUNET_OK != TALER_MINT_DB_upsert_known_coin (db_conn, &known_coin))
-    {
-      GNUNET_break (0);
-      return GNUNET_SYSERR;
-    }
-
-    // FIXME: test first if coin was already melted
-    // in this session, etc.
+    coin_gain = TALER_amount_ntoh (dki->value);
+    tl = TALER_MINT_DB_get_coin_transactions (db_conn,
+                                              &coin_public_infos[i].coin_pub);
+    /* FIXME: compute how much value is left with this coin! */
+    TALER_MINT_DB_free_coin_transaction_list (tl);
 
     melt.coin = coin_public_infos[i];
     melt.session_pub = *session_pub;
@@ -566,22 +531,22 @@ refresh_accept_melts (struct MHD_Connection *connection,
       return GNUNET_SYSERR;
     }
 
-    coin_gain = TALER_amount_ntoh (dki->value);
-    coin_gain = TALER_amount_subtract (coin_gain, known_coin.expended_balance);
 
     /* Refuse to refresh when the coin does not have enough money left to
      * pay the refreshing fees of the coin. */
 
-    if (TALER_amount_cmp (coin_gain, TALER_amount_ntoh (dki->fee_refresh)) < 0)
+    if (TALER_amount_cmp (coin_gain,
+                          TALER_amount_ntoh (dki->fee_refresh)) < 0)
       return (MHD_YES ==
               TALER_MINT_reply_json_pack (connection,
                                           MHD_HTTP_NOT_FOUND,
                                           "{s:s}",
                                           "error", "depleted")) ? GNUNET_NO : GNUNET_SYSERR;
 
-    coin_gain = TALER_amount_subtract (coin_gain, TALER_amount_ntoh (dki->fee_refresh));
-
-    *r_melt_balance = TALER_amount_add (*r_melt_balance, coin_gain);
+    coin_gain = TALER_amount_subtract (coin_gain,
+                                       TALER_amount_ntoh (dki->fee_refresh));
+    *r_melt_balance = TALER_amount_add (*r_melt_balance,
+                                        coin_gain);
   }
   return GNUNET_OK;
 }
@@ -647,8 +612,6 @@ TALER_MINT_db_execute_refresh_melt (struct MHD_Connection *connection,
     return TALER_MINT_reply_internal_db_error (connection);
   }
 
-
-
   session.melt_sig = *client_signature;
   session.num_oldcoins = coin_count;
   session.num_newcoins = num_new_denoms;
@@ -1284,8 +1247,7 @@ TALER_MINT_db_execute_refresh_link (struct MHD_Connection *connection,
   if (GNUNET_SYSERR == res)
   {
     GNUNET_break (0);
-        // FIXME: return error code!
-    return MHD_NO;
+    return TALER_MINT_reply_internal_db_error (connection);
   }
   if (GNUNET_NO == res)
   {
@@ -1308,7 +1270,7 @@ TALER_MINT_db_execute_refresh_link (struct MHD_Connection *connection,
   if (GNUNET_SYSERR == res)
   {
     GNUNET_break (0);
-        // FIXME: return error code!
+    // FIXME: return error code!
     return MHD_NO;
   }
   if (GNUNET_NO == res)