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/*
This file is part of TALER
(C) 2024 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 bank-lib/fakebank_twg_get_transfers.c
* @brief routines to return account histories for the Taler Wire Gateway API
* @author Christian Grothoff <christian@grothoff.org>
*/
#include "platform.h"
#include <pthread.h>
#include "taler_fakebank_lib.h"
#include "taler_bank_service.h"
#include "taler_mhd_lib.h"
#include <gnunet/gnunet_mhd_compat.h>
#include "fakebank.h"
#include "fakebank_common_lookup.h"
#include "fakebank_common_lp.h"
#include "fakebank_common_parser.h"
#include "fakebank_twg_get_transfers.h"
MHD_RESULT
TALER_FAKEBANK_twg_get_transfers_ (
struct TALER_FAKEBANK_Handle *h,
struct MHD_Connection *connection,
const char *account,
void **con_cls)
{
struct Transaction *pos;
const char *acc_payto_uri;
json_t *history;
struct Account *acc;
int64_t limit = -20;
uint64_t offset;
bool have_start;
const char *status;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Handling /transfers connection %p\n",
connection);
TALER_MHD_parse_request_snumber (connection,
"limit",
&limit);
if (limit > 0)
offset = 0;
else
offset = UINT64_MAX;
TALER_MHD_parse_request_number (connection,
"offset",
&offset);
have_start = ((0 != offset) && (UINT64_MAX != offset));
status = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"status");
if ( (NULL != status) &&
(0 != strcasecmp (status,
"success")) )
{
/* we only have successful transactions */
return TALER_MHD_reply_static (connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
}
GNUNET_assert (0 ==
pthread_mutex_lock (&h->big_lock));
if (UINT64_MAX == offset)
offset = h->serial_counter;
acc = TALER_FAKEBANK_lookup_account_ (h,
account,
NULL);
if (NULL == acc)
{
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_BANK_UNKNOWN_ACCOUNT,
account);
}
history = json_array ();
if (NULL == history)
{
GNUNET_break (0);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_NO;
}
if (! have_start)
{
pos = (0 > limit)
? acc->out_tail
: acc->out_head;
}
else
{
struct Transaction *t = h->transactions[offset % h->ram_limit];
bool overflow;
uint64_t dir;
bool skip = true;
dir = (0 > limit) ? (h->ram_limit - 1) : 1;
overflow = (t->row_id != offset);
/* If account does not match, linear scan for
first matching account. */
while ( (! overflow) &&
(NULL != t) &&
(t->debit_account != acc) )
{
skip = false;
t = h->transactions[(t->row_id + dir) % h->ram_limit];
if ( (NULL != t) &&
(t->row_id == offset) )
overflow = true; /* full circle, give up! */
}
if ( (NULL == t) ||
(t->debit_account != acc) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Invalid start specified, transaction %llu not with account %s!\n",
(unsigned long long) offset,
account);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_NO;
}
if (skip)
{
/* range is exclusive, skip the matching entry */
if (0 > limit)
pos = t->prev_out;
else
pos = t->next_out;
}
else
{
pos = t;
}
}
if (NULL != pos)
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Returning %lld debit transactions starting (inclusive) from %llu\n",
(long long) limit,
(unsigned long long) pos->row_id);
while ( (0 != limit) &&
(NULL != pos) )
{
json_t *trans;
char *credit_payto;
if (T_DEBIT != pos->type)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Unexpected CREDIT transaction #%llu for account `%s'\n",
(unsigned long long) pos->row_id,
account);
if (0 > limit)
pos = pos->prev_in;
if (0 < limit)
pos = pos->next_in;
continue;
}
GNUNET_asprintf (&credit_payto,
"payto://x-taler-bank/localhost/%s?receiver-name=%s",
pos->credit_account->account_name,
pos->credit_account->receiver_name);
trans = GNUNET_JSON_PACK (
GNUNET_JSON_pack_uint64 ("row_id",
pos->row_id),
GNUNET_JSON_pack_timestamp ("timestamp",
pos->date),
TALER_JSON_pack_amount ("amount",
&pos->amount),
GNUNET_JSON_pack_string ("credit_account",
credit_payto),
GNUNET_JSON_pack_string ("status",
"success"));
GNUNET_assert (NULL != trans);
GNUNET_free (credit_payto);
GNUNET_assert (0 ==
json_array_append_new (history,
trans));
if (limit > 0)
limit--;
else
limit++;
if (0 > limit)
pos = pos->prev_out;
if (0 < limit)
pos = pos->next_out;
}
acc_payto_uri = acc->payto_uri;
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
if (0 == json_array_size (history))
{
json_decref (history);
return TALER_MHD_reply_static (connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
}
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_string (
"debit_account",
acc_payto_uri),
GNUNET_JSON_pack_array_steal (
"transfers",
history));
}
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