path: root/src/backenddb/pg_lookup_transfers.c

/*
   This file is part of TALER
   Copyright (C) 2022 Taler Systems SA

   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, see <http://www.gnu.org/licenses/>
 */
/**
 * @file backenddb/pg_lookup_transfers.c
 * @brief Implementation of the lookup_transfers function for Postgres
 * @author Christian Grothoff
 */
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_lookup_transfers.h"
#include "pg_helper.h"


/**
 * Closure for #lookup_transfers_cb().
 */
struct LookupTransfersContext
{
  /**
   * Function to call on results.
   */
  TALER_MERCHANTDB_TransferCallback cb;

  /**
   * Closure for @e cb.
   */
  void *cb_cls;

  /**
   * Postgres context.
   */
  struct PostgresClosure *pg;

  /**
   * Transaction status (set).
   */
  enum GNUNET_DB_QueryStatus qs;

  /**
   * Filter to apply by verification status.
   */
  enum TALER_EXCHANGE_YesNoAll verified;
};


/**
 * Function to be called with the results of a SELECT statement
 * that has returned @a num_results results.
 *
 * @param cls of type `struct LookupTransfersContext *`
 * @param result the postgres result
 * @param num_results the number of results in @a result
 */
static void
lookup_transfers_cb (void *cls,
                     PGresult *result,
                     unsigned int num_results)
{
  struct LookupTransfersContext *ltc = cls;
  struct PostgresClosure *pg = ltc->pg;

  for (unsigned int i = 0; i<num_results; i++)
  {
    struct TALER_Amount credit_amount;
    struct TALER_WireTransferIdentifierRawP wtid;
    char *payto_uri;
    char *exchange_url;
    uint64_t transfer_serial_id;
    struct GNUNET_TIME_Timestamp execution_time;
    enum TALER_EXCHANGE_YesNoAll verified;
    uint8_t verified8;
    uint8_t confirmed8;
    struct GNUNET_PQ_ResultSpec rs[] = {
      TALER_PQ_RESULT_SPEC_AMOUNT ("credit_amount",
                                   &credit_amount),
      GNUNET_PQ_result_spec_auto_from_type ("wtid",
                                            &wtid),
      GNUNET_PQ_result_spec_string ("payto_uri",
                                    &payto_uri),
      GNUNET_PQ_result_spec_string ("exchange_url",
                                    &exchange_url),
      GNUNET_PQ_result_spec_uint64 ("credit_serial",
                                    &transfer_serial_id),
      GNUNET_PQ_result_spec_timestamp ("execution_time",
                                       &execution_time),
      GNUNET_PQ_result_spec_auto_from_type ("verified",
                                            &verified8),
      GNUNET_PQ_result_spec_auto_from_type ("confirmed",
                                            &confirmed8),
      GNUNET_PQ_result_spec_end
    };

    if (GNUNET_OK !=
        GNUNET_PQ_extract_result (result,
                                  rs,
                                  i))
    {
      GNUNET_break (0);
      ltc->qs = GNUNET_DB_STATUS_HARD_ERROR;
      return;
    }
    if (0 == verified8)
      verified = TALER_EXCHANGE_YNA_NO;
    else
      verified = TALER_EXCHANGE_YNA_YES;
    if ( (ltc->verified == TALER_EXCHANGE_YNA_ALL) ||
         (ltc->verified == verified) )
    {
      ltc->cb (ltc->cb_cls,
               &credit_amount,
               &wtid,
               payto_uri,
               exchange_url,
               transfer_serial_id,
               execution_time,
               TALER_EXCHANGE_YNA_YES == verified,
               0 != confirmed8);
    }
    GNUNET_PQ_cleanup_result (rs);
  }
  ltc->qs = num_results;
}


enum GNUNET_DB_QueryStatus
TMH_PG_lookup_transfers (void *cls,
                         const char *instance_id,
                         const char *payto_uri,
                         struct GNUNET_TIME_Timestamp before,
                         struct GNUNET_TIME_Timestamp after,
                         int64_t limit,
                         uint64_t offset,
                         enum TALER_EXCHANGE_YesNoAll verified,
                         TALER_MERCHANTDB_TransferCallback cb,
                         void *cb_cls)
{
  struct PostgresClosure *pg = cls;
  uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit);
  struct LookupTransfersContext ltc = {
    .cb = cb,
    .cb_cls = cb_cls,
    .pg = pg,
    .verified = verified
  };
  enum GNUNET_DB_QueryStatus qs;
  bool by_time;

  by_time = ( (! GNUNET_TIME_absolute_is_never (before.abs_time)) ||
              (! GNUNET_TIME_absolute_is_zero (after.abs_time)) );
  check_connection (pg);
  if (by_time)
  {
    if (NULL != payto_uri)
    {
      struct GNUNET_PQ_QueryParam params[] = {
        GNUNET_PQ_query_param_string (instance_id),
        GNUNET_PQ_query_param_timestamp (&before),
        GNUNET_PQ_query_param_timestamp (&after),
        GNUNET_PQ_query_param_uint64 (&offset),
        GNUNET_PQ_query_param_uint64 (&plimit),
        GNUNET_PQ_query_param_string (payto_uri),
        GNUNET_PQ_query_param_end
      };

      PREPARE (pg,
               "lookup_transfers_time_payto_asc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",merchant_transfer_signatures.execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE execution_time < $2"
               "   AND execution_time >= $3"
               "   AND credit_serial > $4"
               "   AND payto_uri = $6"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial ASC"
               " LIMIT $5");
      PREPARE (pg,
               "lookup_transfers_time_payto_desc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",merchant_transfer_signatures.execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE execution_time < $2"
               "   AND execution_time >= $3"
               "   AND credit_serial < $4"
               "   AND payto_uri = $6"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial DESC"
               " LIMIT $5");
      qs = GNUNET_PQ_eval_prepared_multi_select (
        pg->conn,
        (limit > 0)
        ? "lookup_transfers_time_payto_asc"
        : "lookup_transfers_time_payto_desc",
        params,
        &lookup_transfers_cb,
        &ltc);
    }
    else
    {
      struct GNUNET_PQ_QueryParam params[] = {
        GNUNET_PQ_query_param_string (instance_id),
        GNUNET_PQ_query_param_timestamp (&before),
        GNUNET_PQ_query_param_timestamp (&after),
        GNUNET_PQ_query_param_uint64 (&offset),
        GNUNET_PQ_query_param_uint64 (&plimit),
        GNUNET_PQ_query_param_end
      };

      PREPARE (pg,
               "lookup_transfers_time_asc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",merchant_transfer_signatures.execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE execution_time < $2"
               "   AND execution_time >= $3"
               "   AND credit_serial > $4"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial ASC"
               " LIMIT $5");
      PREPARE (pg,
               "lookup_transfers_time_desc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",merchant_transfer_signatures.execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE execution_time < $2"
               "   AND execution_time >= $3"
               "   AND credit_serial < $4"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial DESC"
               " LIMIT $5");
      qs = GNUNET_PQ_eval_prepared_multi_select (
        pg->conn,
        (limit > 0)
        ? "lookup_transfers_time_asc"
        : "lookup_transfers_time_desc",
        params,
        &lookup_transfers_cb,
        &ltc);
    }
  }
  else
  {
    if (NULL != payto_uri)
    {
      struct GNUNET_PQ_QueryParam params[] = {
        GNUNET_PQ_query_param_string (instance_id),
        GNUNET_PQ_query_param_uint64 (&offset),
        GNUNET_PQ_query_param_uint64 (&plimit),
        GNUNET_PQ_query_param_string (payto_uri),
        GNUNET_PQ_query_param_end
      };

      PREPARE (pg,
               "lookup_transfers_payto_asc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",CASE WHEN (merchant_transfer_signatures.execution_time) IS NULL"
               "   THEN 9223372036854775807" /* largest BIGINT possible */
               "   ELSE merchant_transfer_signatures.execution_time"
               " END AS execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  LEFT JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE credit_serial > $2"
               "   AND payto_uri = $4"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial ASC"
               " LIMIT $3");
      PREPARE (pg,
               "lookup_transfers_payto_desc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",CASE WHEN (merchant_transfer_signatures.execution_time) IS NULL"
               "   THEN 9223372036854775807" /* largest BIGINT possible */
               "   ELSE merchant_transfer_signatures.execution_time"
               " END AS execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  LEFT JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE credit_serial < $2"
               "   AND payto_uri = $4"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial DESC"
               " LIMIT $3");
      qs = GNUNET_PQ_eval_prepared_multi_select (
        pg->conn,
        (limit > 0)
        ? "lookup_transfers_payto_asc"
        : "lookup_transfers_payto_desc",
        params,
        &lookup_transfers_cb,
        &ltc);
    }
    else
    {
      struct GNUNET_PQ_QueryParam params[] = {
        GNUNET_PQ_query_param_string (instance_id),
        GNUNET_PQ_query_param_uint64 (&offset),
        GNUNET_PQ_query_param_uint64 (&plimit),
        GNUNET_PQ_query_param_end
      };

      PREPARE (pg,
               "lookup_transfers_desc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",CASE WHEN (merchant_transfer_signatures.execution_time) IS NULL"
               "   THEN 9223372036854775807" /* largest BIGINT possible */
               "   ELSE merchant_transfer_signatures.execution_time"
               " END AS execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  LEFT JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE credit_serial < $2"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial DESC"
               " LIMIT $3");
      PREPARE (pg,
               "lookup_transfers_asc",
               "SELECT"
               " mt.credit_amount_val"
               ",mt.credit_amount_frac"
               ",wtid"
               ",merchant_accounts.payto_uri"
               ",exchange_url"
               ",credit_serial"
               ",CASE WHEN (merchant_transfer_signatures.execution_time) IS NULL"
               "   THEN 9223372036854775807" /* largest BIGINT possible */
               "   ELSE merchant_transfer_signatures.execution_time"
               " END AS execution_time"
               ",verified"
               ",confirmed"
               " FROM merchant_transfers mt"
               "  JOIN merchant_accounts USING (account_serial)"
               "  LEFT JOIN merchant_transfer_signatures USING (credit_serial)"
               " WHERE credit_serial > $2"
               "   AND merchant_serial ="
               "     (SELECT merchant_serial"
               "        FROM merchant_instances"
               "       WHERE merchant_id=$1)"
               " ORDER BY credit_serial ASC"
               " LIMIT $3");
      qs = GNUNET_PQ_eval_prepared_multi_select (
        pg->conn,
        (limit > 0)
        ? "lookup_transfers_asc"
        : "lookup_transfers_desc",
        params,
        &lookup_transfers_cb,
        &ltc);
    }
  }
  if (0 >= qs)
    return qs;
  return ltc.qs;
}