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/*
This file is part of TALER
(C) 2016-2023 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_history.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"
/**
* Function called to clean up a history context.
*
* @param cls a `struct HistoryContext *`
*/
static void
history_cleanup (void *cls)
{
struct HistoryContext *hc = cls;
GNUNET_free (hc->payto_uri);
json_decref (hc->history);
GNUNET_free (hc);
}
MHD_RESULT
TALER_FAKEBANK_twg_get_debit_history_ (
struct TALER_FAKEBANK_Handle *h,
struct MHD_Connection *connection,
const char *account,
void **con_cls)
{
struct ConnectionContext *cc = *con_cls;
struct HistoryContext *hc;
struct Transaction *pos;
enum GNUNET_GenericReturnValue ret;
if (NULL == cc)
{
cc = GNUNET_new (struct ConnectionContext);
cc->ctx_cleaner = &history_cleanup;
*con_cls = cc;
hc = GNUNET_new (struct HistoryContext);
cc->ctx = hc;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Handling /history/outgoing connection %p\n",
connection);
if (GNUNET_OK !=
(ret = TALER_FAKEBANK_common_parse_history_args (h,
connection,
&hc->ha)))
{
GNUNET_break_op (0);
return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
}
GNUNET_assert (0 ==
pthread_mutex_lock (&h->big_lock));
hc->acc = TALER_FAKEBANK_lookup_account_ (h,
account,
NULL);
if (NULL == hc->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);
}
GNUNET_asprintf (&hc->payto_uri,
"payto://x-taler-bank/localhost/%s?receiver-name=%s",
account,
hc->acc->receiver_name);
/* New invariant: */
GNUNET_assert (0 == strcmp (hc->payto_uri,
hc->acc->payto_uri));
hc->history = json_array ();
if (NULL == hc->history)
{
GNUNET_break (0);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_NO;
}
hc->timeout = GNUNET_TIME_relative_to_absolute (hc->ha.lp_timeout);
}
else
{
hc = cc->ctx;
GNUNET_assert (0 ==
pthread_mutex_lock (&h->big_lock));
}
if (! hc->ha.have_start)
{
pos = (0 > hc->ha.delta)
? hc->acc->out_tail
: hc->acc->out_head;
}
else
{
struct Transaction *t = h->transactions[hc->ha.start_idx % h->ram_limit];
bool overflow;
uint64_t dir;
bool skip = true;
dir = (0 > hc->ha.delta) ? (h->ram_limit - 1) : 1;
overflow = (t->row_id != hc->ha.start_idx);
/* If account does not match, linear scan for
first matching account. */
while ( (! overflow) &&
(NULL != t) &&
(t->debit_account != hc->acc) )
{
skip = false;
t = h->transactions[(t->row_id + dir) % h->ram_limit];
if ( (NULL != t) &&
(t->row_id == hc->ha.start_idx) )
overflow = true; /* full circle, give up! */
}
if ( (NULL == t) ||
overflow)
{
/* FIXME: these conditions are unclear to me. */
if ( (GNUNET_TIME_relative_is_zero (hc->ha.lp_timeout)) &&
(0 < hc->ha.delta))
{
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
if (overflow)
{
return TALER_MHD_reply_with_ec (
connection,
TALER_EC_BANK_ANCIENT_TRANSACTION_GONE,
NULL);
}
goto finish;
}
if (h->in_shutdown)
{
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
goto finish;
}
TALER_FAKEBANK_start_lp_ (h,
connection,
hc->acc,
GNUNET_TIME_absolute_get_remaining (
hc->timeout),
LP_DEBIT,
NULL);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_YES;
}
if (t->debit_account != hc->acc)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Invalid start specified, transaction %llu not with account %s!\n",
(unsigned long long) hc->ha.start_idx,
account);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_NO;
}
if (skip)
{
/* range is exclusive, skip the matching entry */
if (0 > hc->ha.delta)
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) hc->ha.delta,
(unsigned long long) pos->row_id);
while ( (0 != hc->ha.delta) &&
(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 > hc->ha.delta)
pos = pos->prev_in;
if (0 < hc->ha.delta)
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 ("date",
pos->date),
TALER_JSON_pack_amount ("amount",
&pos->amount),
GNUNET_JSON_pack_string ("credit_account",
credit_payto),
GNUNET_JSON_pack_string ("exchange_base_url",
pos->subject.debit.exchange_base_url),
GNUNET_JSON_pack_data_auto ("wtid",
&pos->subject.debit.wtid));
GNUNET_assert (NULL != trans);
GNUNET_free (credit_payto);
GNUNET_assert (0 ==
json_array_append_new (hc->history,
trans));
if (hc->ha.delta > 0)
hc->ha.delta--;
else
hc->ha.delta++;
if (0 > hc->ha.delta)
pos = pos->prev_out;
if (0 < hc->ha.delta)
pos = pos->next_out;
}
if ( (0 == json_array_size (hc->history)) &&
(! h->in_shutdown) &&
(GNUNET_TIME_absolute_is_future (hc->timeout)) &&
(0 < hc->ha.delta))
{
TALER_FAKEBANK_start_lp_ (h,
connection,
hc->acc,
GNUNET_TIME_absolute_get_remaining (hc->timeout),
LP_DEBIT,
NULL);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_YES;
}
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
finish:
if (0 == json_array_size (hc->history))
{
GNUNET_break (h->in_shutdown ||
(! GNUNET_TIME_absolute_is_future (hc->timeout)));
return TALER_MHD_reply_static (connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
}
{
json_t *h = hc->history;
hc->history = NULL;
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_string (
"debit_account",
hc->payto_uri),
GNUNET_JSON_pack_array_steal (
"outgoing_transactions",
h));
}
}
MHD_RESULT
TALER_FAKEBANK_twg_get_credit_history_ (
struct TALER_FAKEBANK_Handle *h,
struct MHD_Connection *connection,
const char *account,
void **con_cls)
{
struct ConnectionContext *cc = *con_cls;
struct HistoryContext *hc;
const struct Transaction *pos;
enum GNUNET_GenericReturnValue ret;
if (NULL == cc)
{
cc = GNUNET_new (struct ConnectionContext);
cc->ctx_cleaner = &history_cleanup;
*con_cls = cc;
hc = GNUNET_new (struct HistoryContext);
cc->ctx = hc;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Handling /history/incoming connection %p\n",
connection);
if (GNUNET_OK !=
(ret = TALER_FAKEBANK_common_parse_history_args (h,
connection,
&hc->ha)))
{
GNUNET_break_op (0);
return (GNUNET_SYSERR == ret) ? MHD_NO : MHD_YES;
}
GNUNET_assert (0 ==
pthread_mutex_lock (&h->big_lock));
hc->acc = TALER_FAKEBANK_lookup_account_ (h,
account,
NULL);
if (NULL == hc->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);
}
/* FIXME: was simply: acc->payto_uri -- same!? */
GNUNET_asprintf (&hc->payto_uri,
"payto://x-taler-bank/%s/%s?receiver-name=%s",
h->hostname,
account,
hc->acc->receiver_name);
GNUNET_assert (0 == strcmp (hc->payto_uri,
hc->acc->payto_uri));
hc->history = json_array ();
if (NULL == hc->history)
{
GNUNET_break (0);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_NO;
}
hc->timeout = GNUNET_TIME_relative_to_absolute (hc->ha.lp_timeout);
}
else
{
hc = cc->ctx;
GNUNET_assert (0 ==
pthread_mutex_lock (&h->big_lock));
}
if (! hc->ha.have_start)
{
pos = (0 > hc->ha.delta)
? hc->acc->in_tail
: hc->acc->in_head;
}
else
{
struct Transaction *t = h->transactions[hc->ha.start_idx % h->ram_limit];
bool overflow;
uint64_t dir;
bool skip = true;
overflow = ( (NULL != t) && (t->row_id != hc->ha.start_idx) );
dir = (0 > hc->ha.delta) ? (h->ram_limit - 1) : 1;
/* If account does not match, linear scan for
first matching account. */
while ( (! overflow) &&
(NULL != t) &&
(t->credit_account != hc->acc) )
{
skip = false;
t = h->transactions[(t->row_id + dir) % h->ram_limit];
if ( (NULL != t) &&
(t->row_id == hc->ha.start_idx) )
overflow = true; /* full circle, give up! */
}
if ( (NULL == t) ||
overflow)
{
/* FIXME: these conditions are unclear to me. */
if (GNUNET_TIME_relative_is_zero (hc->ha.lp_timeout) &&
(0 < hc->ha.delta))
{
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
if (overflow)
return TALER_MHD_reply_with_ec (
connection,
TALER_EC_BANK_ANCIENT_TRANSACTION_GONE,
NULL);
goto finish;
}
if (h->in_shutdown)
{
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
goto finish;
}
TALER_FAKEBANK_start_lp_ (h,
connection,
hc->acc,
GNUNET_TIME_absolute_get_remaining (
hc->timeout),
LP_CREDIT,
NULL);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_YES;
}
if (skip)
{
/* range from application is exclusive, skip the
matching entry */
if (0 > hc->ha.delta)
pos = t->prev_in;
else
pos = t->next_in;
}
else
{
pos = t;
}
}
if (NULL != pos)
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Returning %lld credit transactions starting (inclusive) from %llu\n",
(long long) hc->ha.delta,
(unsigned long long) pos->row_id);
while ( (0 != hc->ha.delta) &&
(NULL != pos) )
{
json_t *trans;
if (T_CREDIT != pos->type)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Unexpected DEBIT transaction #%llu for account `%s'\n",
(unsigned long long) pos->row_id,
account);
if (0 > hc->ha.delta)
pos = pos->prev_in;
if (0 < hc->ha.delta)
pos = pos->next_in;
continue;
}
trans = GNUNET_JSON_PACK (
GNUNET_JSON_pack_uint64 ("row_id",
pos->row_id),
GNUNET_JSON_pack_timestamp ("date",
pos->date),
TALER_JSON_pack_amount ("amount",
&pos->amount),
GNUNET_JSON_pack_string ("debit_account",
pos->debit_account->payto_uri),
GNUNET_JSON_pack_data_auto ("reserve_pub",
&pos->subject.credit.reserve_pub));
GNUNET_assert (NULL != trans);
GNUNET_assert (0 ==
json_array_append_new (hc->history,
trans));
if (hc->ha.delta > 0)
hc->ha.delta--;
else
hc->ha.delta++;
if (0 > hc->ha.delta)
pos = pos->prev_in;
if (0 < hc->ha.delta)
pos = pos->next_in;
}
if ( (0 == json_array_size (hc->history)) &&
(! h->in_shutdown) &&
(GNUNET_TIME_absolute_is_future (hc->timeout)) &&
(0 < hc->ha.delta))
{
TALER_FAKEBANK_start_lp_ (h,
connection,
hc->acc,
GNUNET_TIME_absolute_get_remaining (hc->timeout),
LP_CREDIT,
NULL);
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
return MHD_YES;
}
GNUNET_assert (0 ==
pthread_mutex_unlock (&h->big_lock));
finish:
if (0 == json_array_size (hc->history))
{
GNUNET_break (h->in_shutdown ||
(! GNUNET_TIME_absolute_is_future (hc->timeout)));
return TALER_MHD_reply_static (connection,
MHD_HTTP_NO_CONTENT,
NULL,
NULL,
0);
}
{
json_t *h = hc->history;
hc->history = NULL;
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
GNUNET_JSON_pack_string (
"credit_account",
hc->payto_uri),
GNUNET_JSON_pack_array_steal (
"incoming_transactions",
h));
}
}
|