/*
This file is part of TALER
Copyright (C) 2016, 2017 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file taler-exchange-wirewatch.c
* @brief Process that watches for wire transfers to the exchange's bank account
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include
#include "taler_exchangedb_lib.h"
#include "taler_exchangedb_plugin.h"
#include "taler_json_lib.h"
#include "taler_wire_lib.h"
/**
* How long do we sleep before trying again if there
* are no transactions returned by the wire plugin?
*/
#define DELAY GNUNET_TIME_UNIT_SECONDS
/**
* Closure for #reject_cb().
*/
struct RejectContext
{
/**
* Wire transfer subject that was illformed.
*/
char *wtid_s;
/**
* Database session that encountered the problem.
*/
struct TALER_EXCHANGEDB_Session *session;
};
/**
* Handle to the plugin.
*/
static struct TALER_WIRE_Plugin *wire_plugin;
/**
* Which currency is used by this exchange?
*/
static char *exchange_currency_string;
/**
* The exchange's configuration (global)
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Our DB plugin.
*/
static struct TALER_EXCHANGEDB_Plugin *db_plugin;
/**
* Value to return from main(). #GNUNET_OK on success, #GNUNET_SYSERR
* on serious errors.
*/
static int global_ret;
/**
* Encoded offset in the wire transfer list that we
* processed last.
*/
static void *last_row_off;
/**
* Number of bytes in #last_row_off.
*/
static size_t last_row_off_size;
/**
* Encoded offset in the wire transfer list from where
* to start the next query with the bank.
*/
static void *start_off;
/**
* Number of bytes in #start_off.
*/
static size_t start_off_size;
/**
* Which wire plugin are we watching?
*/
static char *type;
/**
* Should we delay the next request to the wire plugin a bit?
*/
static int delay;
/**
* Are we run in testing mode and should only do one pass?
*/
static int test_mode;
/**
* Are we running from scratch and should re-process all transactions?
*/
static int reset_mode;
/**
* Next task to run, if any.
*/
static struct GNUNET_SCHEDULER_Task *task;
/**
* Active request for history.
*/
static struct TALER_WIRE_HistoryHandle *hh;
/**
* Active request to reject a wire transfer.
*/
static struct TALER_WIRE_RejectHandle *rt;
/**
* We're being aborted with CTRL-C (or SIGTERM). Shut down.
*
* @param cls closure
*/
static void
shutdown_task (void *cls)
{
if (NULL != task)
{
GNUNET_SCHEDULER_cancel (task);
task = NULL;
}
if (NULL != hh)
{
wire_plugin->get_history_cancel (wire_plugin->cls,
hh);
hh = NULL;
}
if (NULL != rt)
{
char *wtid_s;
wtid_s = wire_plugin->reject_transfer_cancel (wire_plugin->cls,
rt);
rt = NULL;
GNUNET_free (wtid_s);
}
TALER_EXCHANGEDB_plugin_unload (db_plugin);
db_plugin = NULL;
TALER_WIRE_plugin_unload (wire_plugin);
wire_plugin = NULL;
GNUNET_free_non_null (start_off);
start_off = NULL;
}
/**
* Parse configuration parameters for the exchange server into the
* corresponding global variables.
*
* @return #GNUNET_OK on success
*/
static int
exchange_serve_process_config ()
{
if (NULL == type)
{
fprintf (stderr,
"Option `-t' to specify wire plugin is mandatory.\n");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"taler",
"currency",
&exchange_currency_string))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"taler",
"currency");
return GNUNET_SYSERR;
}
if (strlen (exchange_currency_string) >= TALER_CURRENCY_LEN)
{
fprintf (stderr,
"Currency `%s' longer than the allowed limit of %u characters.",
exchange_currency_string,
(unsigned int) TALER_CURRENCY_LEN);
return GNUNET_SYSERR;
}
if (NULL ==
(db_plugin = TALER_EXCHANGEDB_plugin_load (cfg)))
{
fprintf (stderr,
"Failed to initialize DB subsystem\n");
return GNUNET_SYSERR;
}
if (NULL ==
(wire_plugin = TALER_WIRE_plugin_load (cfg,
type)))
{
fprintf (stderr,
"Failed to load wire plugin for `%s'\n",
type);
TALER_EXCHANGEDB_plugin_unload (db_plugin);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Query for incoming wire transfers.
*
* @param cls NULL
*/
static void
find_transfers (void *cls);
/**
* Function called upon completion of the rejection of a wire transfer.
*
* @param cls closure with the `struct RejectContext`
* @param ec error code for the operation
*/
static void
reject_cb (void *cls,
enum TALER_ErrorCode ec)
{
struct RejectContext *rtc = cls;
enum GNUNET_DB_QueryStatus qs;
rt = NULL;
if (TALER_EC_NONE != ec)
{
fprintf (stderr,
"Failed to wire back transfer `%s': %d\n",
rtc->wtid_s,
ec);
GNUNET_free (rtc->wtid_s);
db_plugin->rollback (db_plugin->cls,
rtc->session);
GNUNET_free (rtc);
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_free (rtc->wtid_s);
qs = db_plugin->commit (db_plugin->cls,
rtc->session);
GNUNET_free (rtc);
if (0 <= qs)
{
GNUNET_free_non_null (start_off);
start_off = last_row_off;
start_off_size = last_row_off_size;
}
task = GNUNET_SCHEDULER_add_now (&find_transfers,
NULL);
}
/**
* Callbacks of this type are used to serve the result of asking
* the bank for the transaction history.
*
* @param cls closure with the `struct TALER_EXCHANGEDB_Session *`
* @param ec taler error code
* @param dir direction of the transfer
* @param row_off identification of the position at which we are querying
* @param row_off_size number of bytes in @a row_off
* @param details details about the wire transfer
* @return #GNUNET_OK to continue, #GNUNET_SYSERR to abort iteration
*/
static int
history_cb (void *cls,
enum TALER_ErrorCode ec,
enum TALER_BANK_Direction dir,
const void *row_off,
size_t row_off_size,
const struct TALER_WIRE_TransferDetails *details)
{
struct TALER_EXCHANGEDB_Session *session = cls;
enum GNUNET_DB_QueryStatus qs;
struct TALER_ReservePublicKeyP reserve_pub;
if (TALER_BANK_DIRECTION_NONE == dir)
{
hh = NULL;
if (TALER_EC_NONE != ec)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Error fetching history: %u!\n",
(unsigned int) ec);
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"End of list. Committing progress!\n");
qs = db_plugin->commit (db_plugin->cls,
session);
if (0 <= qs)
{
GNUNET_free_non_null (start_off);
start_off = last_row_off;
start_off_size = last_row_off_size;
}
if ( (GNUNET_YES == delay) &&
(test_mode) )
{
GNUNET_SCHEDULER_shutdown ();
return GNUNET_OK;
}
if (GNUNET_YES == delay)
task = GNUNET_SCHEDULER_add_delayed (DELAY,
&find_transfers,
NULL);
else
task = GNUNET_SCHEDULER_add_now (&find_transfers,
NULL);
return GNUNET_OK; /* will be ignored anyway */
}
if (NULL != details->wtid_s)
{
struct RejectContext *rtc;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Wire transfer over %s has invalid subject `%s', sending it back!\n",
TALER_amount2s (&details->amount),
details->wtid_s);
if (last_row_off_size != row_off_size)
{
GNUNET_free_non_null (last_row_off);
last_row_off = GNUNET_malloc (row_off_size);
}
memcpy (last_row_off,
row_off,
row_off_size);
rtc = GNUNET_new (struct RejectContext);
rtc->session = session;
rtc->wtid_s = GNUNET_strdup (details->wtid_s);
rt = wire_plugin->reject_transfer (wire_plugin->cls,
row_off,
row_off_size,
&reject_cb,
rtc);
return GNUNET_SYSERR; /* will continue later... */
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Adding wire transfer over %s with subject `%s'\n",
TALER_amount2s (&details->amount),
TALER_B2S (&details->wtid));
/* Wire transfer identifier == reserve public key */
GNUNET_assert (sizeof (reserve_pub) == sizeof (details->wtid));
memcpy (&reserve_pub,
&details->wtid,
sizeof (reserve_pub));
qs = db_plugin->reserves_in_insert (db_plugin->cls,
session,
&reserve_pub,
&details->amount,
details->execution_date,
details->account_details,
row_off,
row_off_size);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_break (0);
db_plugin->rollback (db_plugin->cls,
session);
GNUNET_SCHEDULER_shutdown ();
return GNUNET_SYSERR;
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
db_plugin->rollback (db_plugin->cls,
session);
/* try again */
task = GNUNET_SCHEDULER_add_now (&find_transfers,
NULL);
return GNUNET_SYSERR;
}
if (last_row_off_size != row_off_size)
{
GNUNET_free_non_null (last_row_off);
last_row_off = GNUNET_malloc (row_off_size);
}
memcpy (last_row_off,
row_off,
row_off_size);
return GNUNET_OK;
}
/**
* Query for incoming wire transfers.
*
* @param cls NULL
*/
static void
find_transfers (void *cls)
{
struct TALER_EXCHANGEDB_Session *session;
enum GNUNET_DB_QueryStatus qs;
task = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Checking for incoming wire transfers\n");
if (NULL == (session = db_plugin->get_session (db_plugin->cls)))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to obtain database session!\n");
global_ret = GNUNET_SYSERR;
GNUNET_SCHEDULER_shutdown ();
return;
}
if (GNUNET_OK !=
db_plugin->start (db_plugin->cls,
session))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to start database transaction!\n");
global_ret = GNUNET_SYSERR;
GNUNET_SCHEDULER_shutdown ();
return;
}
if (! reset_mode)
{
qs = db_plugin->get_latest_reserve_in_reference (db_plugin->cls,
session,
&start_off,
&start_off_size);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to obtain starting point for montoring from database!\n");
global_ret = GNUNET_SYSERR;
GNUNET_SCHEDULER_shutdown ();
return;
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
/* try again */
db_plugin->rollback (db_plugin->cls,
session);
task = GNUNET_SCHEDULER_add_now (&find_transfers,
NULL);
return;
}
}
delay = GNUNET_YES;
hh = wire_plugin->get_history (wire_plugin->cls,
TALER_BANK_DIRECTION_CREDIT,
start_off,
start_off_size,
1024,
&history_cb,
session);
if (NULL == hh)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to start request for account history!\n");
db_plugin->rollback (db_plugin->cls,
session);
global_ret = GNUNET_SYSERR;
GNUNET_SCHEDULER_shutdown ();
return;
}
}
/**
* First task.
*
* @param cls closure, NULL
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param c configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *c)
{
cfg = c;
if (GNUNET_OK !=
exchange_serve_process_config ())
{
global_ret = 1;
return;
}
task = GNUNET_SCHEDULER_add_now (&find_transfers,
NULL);
GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
cls);
}
/**
* The main function of taler-exchange-wirewatch
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc,
char *const *argv)
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_string ('t',
"type",
"PLUGINNAME",
"which wire plugin to use",
&type),
GNUNET_GETOPT_option_flag ('T',
"test",
"run in test mode and exit when idle",
&test_mode),
GNUNET_GETOPT_option_flag ('r',
"reset",
"start fresh with all transactions in the history",
&reset_mode),
GNUNET_GETOPT_OPTION_END
};
if (GNUNET_OK !=
GNUNET_STRINGS_get_utf8_args (argc, argv,
&argc, &argv))
return 2;
if (GNUNET_OK !=
GNUNET_PROGRAM_run (argc, argv,
"taler-exchange-wirewatch",
gettext_noop ("background process that watches for incomming wire transfers from customers"),
options,
&run, NULL))
{
GNUNET_free ((void*) argv);
return 1;
}
GNUNET_free ((void*) argv);
return global_ret;
}
/* end of taler-exchange-wirewatch.c */