/*
This file is part of TALER
Copyright (C) 2016-2021 Taler Systems SA
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-aggregator.c
* @brief Process that aggregates outgoing transactions and prepares their execution
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include "taler_exchangedb_lib.h"
#include "taler_exchangedb_plugin.h"
#include "taler_json_lib.h"
#include "taler_bank_service.h"
/**
* Information about one aggregation process to be executed. There is
* at most one of these around at any given point in time.
* Note that this limits parallelism, and we might want
* to revise this decision at a later point.
*/
struct AggregationUnit
{
/**
* Public key of the merchant.
*/
struct TALER_MerchantPublicKeyP merchant_pub;
/**
* Total amount to be transferred, before subtraction of @e fees.wire and rounding down.
*/
struct TALER_Amount total_amount;
/**
* Final amount to be transferred (after fee and rounding down).
*/
struct TALER_Amount final_amount;
/**
* Wire fee we charge for @e wp at @e execution_time.
*/
struct TALER_WireFeeSet fees;
/**
* Wire transfer identifier we use.
*/
struct TALER_WireTransferIdentifierRawP wtid;
/**
* Row ID of the transaction that started it all.
*/
uint64_t row_id;
/**
* The current time (which triggered the aggregation and
* defines the wire fee).
*/
struct GNUNET_TIME_Timestamp execution_time;
/**
* Wire details of the merchant.
*/
char *payto_uri;
/**
* Selected wire target for the aggregation.
*/
struct TALER_PaytoHashP h_payto;
/**
* Serial number of the wire target.
*/
uint64_t wire_target;
/**
* Exchange wire account to be used for the preparation and
* eventual execution of the aggregate wire transfer.
*/
const struct TALER_EXCHANGEDB_AccountInfo *wa;
/**
* Array of row_ids from the aggregation.
*/
uint64_t additional_rows[TALER_EXCHANGEDB_MATCHING_DEPOSITS_LIMIT];
/**
* Offset specifying how many @e additional_rows are in use.
*/
unsigned int rows_offset;
/**
* Set to true if we encountered a refund during #refund_by_coin_cb.
* Used to wave the deposit fee.
*/
bool have_refund;
};
/**
* Work shard we are processing.
*/
struct Shard
{
/**
* When did we start processing the shard?
*/
struct GNUNET_TIME_Timestamp start_time;
/**
* Starting row of the shard.
*/
uint32_t shard_start;
/**
* Inclusive end row of the shard.
*/
uint32_t shard_end;
/**
* Number of starting points found in the shard.
*/
uint64_t work_counter;
};
/**
* What is the smallest unit we support for wire transfers?
* We will need to round down to a multiple of this amount.
*/
static struct TALER_Amount currency_round_unit;
/**
* What is the base URL of this exchange? Used in the
* wire transfer subjects so that merchants and governments
* can ask for the list of aggregated deposits.
*/
static char *exchange_base_url;
/**
* Set to #GNUNET_YES if this exchange does not support KYC checks
* and thus deposits are to be aggregated regardless of the
* KYC status of the target account.
*/
static int kyc_off;
/**
* The exchange's configuration.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Our database plugin.
*/
static struct TALER_EXCHANGEDB_Plugin *db_plugin;
/**
* Next task to run, if any.
*/
static struct GNUNET_SCHEDULER_Task *task;
/**
* How long should we sleep when idle before trying to find more work?
*/
static struct GNUNET_TIME_Relative aggregator_idle_sleep_interval;
/**
* How big are the shards we are processing? Is an inclusive offset, so every
* shard ranges from [X,X+shard_size) exclusive. So a shard covers
* shard_size slots. The maximum value for shard_size is INT32_MAX+1.
*/
static uint32_t shard_size;
/**
* Value to return from main(). 0 on success, non-zero on errors.
*/
static int global_ret;
/**
* #GNUNET_YES if we are in test mode and should exit when idle.
*/
static int test_mode;
/**
* Main work function that queries the DB and aggregates transactions
* into larger wire transfers.
*
* @param cls a `struct Shard *`
*/
static void
run_aggregation (void *cls);
/**
* Select a shard to work on.
*
* @param cls NULL
*/
static void
run_shard (void *cls);
/**
* Free data stored in @a au, but not @a au itself (stack allocated).
*
* @param au aggregation unit to clean up
*/
static void
cleanup_au (struct AggregationUnit *au)
{
GNUNET_assert (NULL != au);
GNUNET_free (au->payto_uri);
memset (au,
0,
sizeof (*au));
}
/**
* We're being aborted with CTRL-C (or SIGTERM). Shut down.
*
* @param cls closure
*/
static void
shutdown_task (void *cls)
{
(void) cls;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Running shutdown\n");
if (NULL != task)
{
GNUNET_SCHEDULER_cancel (task);
task = NULL;
}
TALER_EXCHANGEDB_plugin_unload (db_plugin);
db_plugin = NULL;
TALER_EXCHANGEDB_unload_accounts ();
cfg = NULL;
}
/**
* Parse the configuration for wirewatch.
*
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
parse_wirewatch_config (void)
{
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exchange",
"BASE_URL",
&exchange_base_url))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"exchange",
"BASE_URL");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (cfg,
"exchange",
"AGGREGATOR_IDLE_SLEEP_INTERVAL",
&aggregator_idle_sleep_interval))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"exchange",
"AGGREGATOR_IDLE_SLEEP_INTERVAL");
return GNUNET_SYSERR;
}
if ( (GNUNET_OK !=
TALER_config_get_amount (cfg,
"taler",
"CURRENCY_ROUND_UNIT",
¤cy_round_unit)) ||
( (0 != currency_round_unit.fraction) &&
(0 != currency_round_unit.value) ) )
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Need non-zero value in section `TALER' under `CURRENCY_ROUND_UNIT'\n");
return GNUNET_SYSERR;
}
if (NULL ==
(db_plugin = TALER_EXCHANGEDB_plugin_load (cfg)))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to initialize DB subsystem\n");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
TALER_EXCHANGEDB_load_accounts (cfg,
TALER_EXCHANGEDB_ALO_DEBIT))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"No wire accounts configured for debit!\n");
TALER_EXCHANGEDB_plugin_unload (db_plugin);
db_plugin = NULL;
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Callback invoked with information about refunds applicable
* to a particular coin. Subtract refunded amount(s) from
* the aggregation unit's total amount.
*
* @param cls closure with a `struct AggregationUnit *`
* @param amount_with_fee what was the refunded amount with the fee
* @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
*/
static enum GNUNET_GenericReturnValue
refund_by_coin_cb (void *cls,
const struct TALER_Amount *amount_with_fee)
{
struct AggregationUnit *aux = cls;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Aggregator subtracts applicable refund of amount %s\n",
TALER_amount2s (amount_with_fee));
aux->have_refund = true;
if (0 >
TALER_amount_subtract (&aux->total_amount,
&aux->total_amount,
amount_with_fee))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function called with details about deposits that have been made,
* with the goal of executing the corresponding wire transaction.
*
* @param cls a `struct AggregationUnit`
* @param row_id identifies database entry
* @param merchant_pub public key of the merchant
* @param coin_pub public key of the coin
* @param amount_with_fee amount that was deposited including fee
* @param deposit_fee amount the exchange gets to keep as transaction fees
* @param h_contract_terms hash of the proposal data known to merchant and customer
* @param wire_target target account for the wire transfer
* @param payto_uri URI of the target account
* @return transaction status code, #GNUNET_DB_STATUS_SUCCESS_ONE_RESULT to continue to iterate
*/
static enum GNUNET_DB_QueryStatus
deposit_cb (void *cls,
uint64_t row_id,
const struct TALER_MerchantPublicKeyP *merchant_pub,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *amount_with_fee,
const struct TALER_Amount *deposit_fee,
const struct TALER_PrivateContractHashP *h_contract_terms,
uint64_t wire_target,
const char *payto_uri)
{
struct AggregationUnit *au = cls;
enum GNUNET_DB_QueryStatus qs;
au->merchant_pub = *merchant_pub;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Aggregator processing payment %s with amount %s\n",
TALER_B2S (coin_pub),
TALER_amount2s (amount_with_fee));
au->row_id = row_id;
au->total_amount = *amount_with_fee;
au->have_refund = false;
qs = db_plugin->select_refunds_by_coin (db_plugin->cls,
coin_pub,
&au->merchant_pub,
h_contract_terms,
&refund_by_coin_cb,
au);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
if (! au->have_refund)
{
struct TALER_Amount ntotal;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Non-refunded transaction, subtracting deposit fee %s\n",
TALER_amount2s (deposit_fee));
if (0 >
TALER_amount_subtract (&ntotal,
amount_with_fee,
deposit_fee))
{
/* This should never happen, issue a warning, but continue processing
with an amount of zero, least we hang here for good. */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Fatally malformed record at row %llu over %s (deposit fee exceeds deposited value)\n",
(unsigned long long) row_id,
TALER_amount2s (amount_with_fee));
GNUNET_assert (GNUNET_OK ==
TALER_amount_set_zero (au->total_amount.currency,
&au->total_amount));
}
else
{
au->total_amount = ntotal;
}
}
GNUNET_assert (NULL == au->payto_uri);
au->payto_uri = GNUNET_strdup (payto_uri);
TALER_payto_hash (payto_uri,
&au->h_payto);
au->wire_target = wire_target;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
&au->wtid,
sizeof (au->wtid));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Starting aggregation under H(WTID)=%s, starting amount %s at %llu\n",
TALER_B2S (&au->wtid),
TALER_amount2s (amount_with_fee),
(unsigned long long) row_id);
au->wa = TALER_EXCHANGEDB_find_account_by_payto_uri (payto_uri);
if (NULL == au->wa)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"No exchange account configured for `%s', please fix your setup to continue!\n",
payto_uri);
return GNUNET_DB_STATUS_HARD_ERROR;
}
/* make sure we have current fees */
au->execution_time = GNUNET_TIME_timestamp_get ();
{
struct GNUNET_TIME_Timestamp start_date;
struct GNUNET_TIME_Timestamp end_date;
struct TALER_MasterSignatureP master_sig;
enum GNUNET_DB_QueryStatus qs;
qs = db_plugin->get_wire_fee (db_plugin->cls,
au->wa->method,
au->execution_time,
&start_date,
&end_date,
&au->fees,
&master_sig);
if (0 >= qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Could not get wire fees for %s at %s. Aborting run.\n",
au->wa->method,
GNUNET_TIME_timestamp2s (au->execution_time));
return GNUNET_DB_STATUS_HARD_ERROR;
}
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Aggregator starts aggregation for deposit %llu to %s with wire fee %s\n",
(unsigned long long) row_id,
TALER_B2S (&au->wtid),
TALER_amount2s (&au->fees.wire));
qs = db_plugin->insert_aggregation_tracking (db_plugin->cls,
&au->wtid,
row_id);
if (qs <= 0)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Aggregator marks deposit %llu as done\n",
(unsigned long long) row_id);
qs = db_plugin->mark_deposit_done (db_plugin->cls,
merchant_pub,
row_id);
if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
return qs;
}
/**
* Function called with details about another deposit we
* can aggregate into an existing aggregation unit.
*
* @param cls a `struct AggregationUnit`
* @param row_id identifies database entry
* @param coin_pub public key of the coin
* @param amount_with_fee amount that was deposited including fee
* @param deposit_fee amount the exchange gets to keep as transaction fees
* @param h_contract_terms hash of the proposal data known to merchant and customer
* @return transaction status code
*/
static enum GNUNET_DB_QueryStatus
aggregate_cb (void *cls,
uint64_t row_id,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *amount_with_fee,
const struct TALER_Amount *deposit_fee,
const struct TALER_PrivateContractHashP *h_contract_terms)
{
struct AggregationUnit *au = cls;
struct TALER_Amount old;
enum GNUNET_DB_QueryStatus qs;
if (au->rows_offset >= TALER_EXCHANGEDB_MATCHING_DEPOSITS_LIMIT)
{
/* Bug: we asked for at most #TALER_EXCHANGEDB_MATCHING_DEPOSITS_LIMIT results! */
GNUNET_break (0);
/* Skip this one, but keep going with the overall transaction */
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}
/* add to total */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Adding transaction amount %s from row %llu to aggregation\n",
TALER_amount2s (amount_with_fee),
(unsigned long long) row_id);
/* save the existing total aggregate in 'old', for later */
old = au->total_amount;
/* we begin with the total contribution of the current coin */
au->total_amount = *amount_with_fee;
/* compute contribution of this coin (after fees) */
au->have_refund = false;
qs = db_plugin->select_refunds_by_coin (db_plugin->cls,
coin_pub,
&au->merchant_pub,
h_contract_terms,
&refund_by_coin_cb,
au);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
if (! au->have_refund)
{
struct TALER_Amount tmp;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Subtracting deposit fee %s for non-refunded coin\n",
TALER_amount2s (deposit_fee));
if (0 >
TALER_amount_subtract (&tmp,
&au->total_amount,
deposit_fee))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Fatally malformed record at %llu over amount %s (deposit fee exceeds deposited value)\n",
(unsigned long long) row_id,
TALER_amount2s (&au->total_amount));
GNUNET_assert (GNUNET_OK ==
TALER_amount_set_zero (old.currency,
&au->total_amount));
}
else
{
au->total_amount = tmp;
}
}
/* now add the au->total_amount with the (remaining) contribution of
the current coin to the 'old' value with the current aggregate value */
{
struct TALER_Amount tmp;
if (0 >
TALER_amount_add (&tmp,
&au->total_amount,
&old))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Overflow or currency incompatibility during aggregation at %llu\n",
(unsigned long long) row_id);
/* Skip this one, but keep going! */
au->total_amount = old;
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}
au->total_amount = tmp;
}
/* "append" to our list of rows */
au->additional_rows[au->rows_offset++] = row_id;
/* insert into aggregation tracking table */
qs = db_plugin->insert_aggregation_tracking (db_plugin->cls,
&au->wtid,
row_id);
if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
qs = db_plugin->mark_deposit_done (db_plugin->cls,
&au->merchant_pub,
row_id);
if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
{
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
return qs;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Aggregator marked deposit %llu as DONE\n",
(unsigned long long) row_id);
return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}
/**
* Perform a database commit. If it fails, print a warning.
*
* @return status of commit
*/
static enum GNUNET_DB_QueryStatus
commit_or_warn (void)
{
enum GNUNET_DB_QueryStatus qs;
qs = db_plugin->commit (db_plugin->cls);
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
return qs;
GNUNET_log ((GNUNET_DB_STATUS_SOFT_ERROR == qs)
? GNUNET_ERROR_TYPE_INFO
: GNUNET_ERROR_TYPE_ERROR,
"Failed to commit database transaction!\n");
return qs;
}
/**
* Release lock on shard @a s in the database.
* On error, terminates this process.
*
* @param[in] s shard to free (and memory to release)
*/
static void
release_shard (struct Shard *s)
{
enum GNUNET_DB_QueryStatus qs;
qs = db_plugin->release_revolving_shard (
db_plugin->cls,
"aggregator",
s->shard_start,
s->shard_end);
GNUNET_free (s);
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
case GNUNET_DB_STATUS_SOFT_ERROR:
GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
GNUNET_break (0);
GNUNET_SCHEDULER_shutdown ();
return;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
/* Strange, but let's just continue */
break;
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
/* normal case */
break;
}
}
static void
run_aggregation (void *cls)
{
struct Shard *s = cls;
struct AggregationUnit au_active;
enum GNUNET_DB_QueryStatus qs;
task = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Checking for ready deposits to aggregate\n");
if (GNUNET_OK !=
db_plugin->start_deferred_wire_out (db_plugin->cls))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to start database transaction!\n");
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
memset (&au_active,
0,
sizeof (au_active));
qs = db_plugin->get_ready_deposit (
db_plugin->cls,
s->shard_start,
s->shard_end,
kyc_off ? true : false,
&deposit_cb,
&au_active);
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
cleanup_au (&au_active);
db_plugin->rollback (db_plugin->cls);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to begin deposit iteration!\n");
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
case GNUNET_DB_STATUS_SOFT_ERROR:
cleanup_au (&au_active);
db_plugin->rollback (db_plugin->cls);
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
{
uint64_t counter = s->work_counter;
struct GNUNET_TIME_Relative duration
= GNUNET_TIME_absolute_get_duration (s->start_time.abs_time);
cleanup_au (&au_active);
db_plugin->rollback (db_plugin->cls);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Completed shard [%u,%u] after %s with %llu deposits\n",
(unsigned int) s->shard_start,
(unsigned int) s->shard_end,
GNUNET_TIME_relative2s (duration,
true),
(unsigned long long) counter);
release_shard (s);
if ( (GNUNET_YES == test_mode) &&
(0 == counter) )
{
/* in test mode, shutdown after a shard is done with 0 work */
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_assert (NULL == task);
/* If we ended up doing zero work, sleep a bit */
if (0 == counter)
task = GNUNET_SCHEDULER_add_delayed (aggregator_idle_sleep_interval,
&run_shard,
NULL);
else
task = GNUNET_SCHEDULER_add_now (&run_shard,
NULL);
return;
}
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
s->work_counter++;
/* continued below */
break;
}
/* Now try to find other deposits to aggregate */
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Found ready deposit for %s, aggregating by target %llu\n",
TALER_B2S (&au_active.merchant_pub),
(unsigned long long) au_active.wire_target);
qs = db_plugin->iterate_matching_deposits (db_plugin->cls,
&au_active.h_payto,
&au_active.merchant_pub,
&aggregate_cb,
&au_active,
TALER_EXCHANGEDB_MATCHING_DEPOSITS_LIMIT);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to execute deposit iteration!\n");
cleanup_au (&au_active);
db_plugin->rollback (db_plugin->cls);
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
/* serializiability issue, try again */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Serialization issue, trying again later!\n");
db_plugin->rollback (db_plugin->cls);
cleanup_au (&au_active);
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Found %d other deposits to combine into wire transfer.\n",
qs);
/* Subtract wire transfer fee and round to the unit supported by the
wire transfer method; Check if after rounding down, we still have
an amount to transfer, and if not mark as 'tiny'. */
if ( (0 >=
TALER_amount_subtract (&au_active.final_amount,
&au_active.total_amount,
&au_active.fees.wire)) ||
(GNUNET_SYSERR ==
TALER_amount_round_down (&au_active.final_amount,
¤cy_round_unit)) ||
( (0 == au_active.final_amount.value) &&
(0 == au_active.final_amount.fraction) ) )
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Aggregate value too low for transfer (%d/%s)\n",
qs,
TALER_amount2s (&au_active.final_amount));
/* Rollback ongoing transaction, as we will not use the respective
WTID and thus need to remove the tracking data */
db_plugin->rollback (db_plugin->cls);
/* There were results, just the value was too low. Start another
transaction to mark all* of the selected deposits as minor! */
if (GNUNET_OK !=
db_plugin->start (db_plugin->cls,
"aggregator mark tiny transactions"))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to start database transaction!\n");
global_ret = EXIT_FAILURE;
cleanup_au (&au_active);
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
/* Mark transactions by row_id as minor */
qs = db_plugin->mark_deposit_tiny (db_plugin->cls,
&au_active.merchant_pub,
au_active.row_id);
if (0 <= qs)
{
for (unsigned int i = 0; imark_deposit_tiny (db_plugin->cls,
&au_active.merchant_pub,
au_active.additional_rows[i]);
if (0 > qs)
break;
}
}
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Serialization issue, trying again later!\n");
db_plugin->rollback (db_plugin->cls);
cleanup_au (&au_active);
/* start again */
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
}
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
db_plugin->rollback (db_plugin->cls);
cleanup_au (&au_active);
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
/* commit */
(void) commit_or_warn ();
cleanup_au (&au_active);
/* start again */
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Preparing wire transfer of %s to %s\n",
TALER_amount2s (&au_active.final_amount),
TALER_B2S (&au_active.merchant_pub));
{
void *buf;
size_t buf_size;
TALER_BANK_prepare_transfer (au_active.payto_uri,
&au_active.final_amount,
exchange_base_url,
&au_active.wtid,
&buf,
&buf_size);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Storing %u bytes of wire prepare data\n",
(unsigned int) buf_size);
/* Commit our intention to execute the wire transfer! */
qs = db_plugin->wire_prepare_data_insert (db_plugin->cls,
au_active.wa->method,
buf,
buf_size);
GNUNET_free (buf);
}
/* Commit the WTID data to 'wire_out' to finally satisfy aggregation
table constraints */
if (qs >= 0)
qs = db_plugin->store_wire_transfer_out (db_plugin->cls,
au_active.execution_time,
&au_active.wtid,
&au_active.h_payto,
au_active.wa->section_name,
&au_active.final_amount);
cleanup_au (&au_active);
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Serialization issue for prepared wire data; trying again later!\n");
db_plugin->rollback (db_plugin->cls);
/* start again */
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
}
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_break (0);
db_plugin->rollback (db_plugin->cls);
/* die hard */
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Stored wire transfer out instructions\n");
/* Now we can finally commit the overall transaction, as we are
again consistent if all of this passes. */
switch (commit_or_warn ())
{
case GNUNET_DB_STATUS_SOFT_ERROR:
/* try again */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Commit issue for prepared wire data; trying again later!\n");
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
case GNUNET_DB_STATUS_HARD_ERROR:
GNUNET_break (0);
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Preparation complete, going again\n");
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
return;
default:
GNUNET_break (0);
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
release_shard (s);
return;
}
}
/**
* Select a shard to work on.
*
* @param cls NULL
*/
static void
run_shard (void *cls)
{
struct Shard *s;
enum GNUNET_DB_QueryStatus qs;
(void) cls;
task = NULL;
if (GNUNET_SYSERR ==
db_plugin->preflight (db_plugin->cls))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to obtain database connection!\n");
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
return;
}
s = GNUNET_new (struct Shard);
s->start_time = GNUNET_TIME_timestamp_get ();
qs = db_plugin->begin_revolving_shard (db_plugin->cls,
"aggregator",
shard_size,
1U + INT32_MAX,
&s->shard_start,
&s->shard_end);
if (0 >= qs)
{
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
{
static struct GNUNET_TIME_Relative delay;
GNUNET_free (s);
delay = GNUNET_TIME_randomized_backoff (delay,
GNUNET_TIME_UNIT_SECONDS);
task = GNUNET_SCHEDULER_add_delayed (delay,
&run_shard,
NULL);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to begin shard (%d)!\n",
qs);
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
global_ret = EXIT_FAILURE;
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Starting shard [%u:%u]!\n",
(unsigned int) s->shard_start,
(unsigned int) s->shard_end);
task = GNUNET_SCHEDULER_add_now (&run_aggregation,
s);
}
/**
* 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)
{
unsigned long long ass;
(void) cls;
(void) args;
(void) cfgfile;
cfg = c;
if (GNUNET_OK != parse_wirewatch_config ())
{
cfg = NULL;
global_ret = EXIT_NOTCONFIGURED;
return;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (cfg,
"exchange",
"AGGREGATOR_SHARD_SIZE",
&ass))
{
cfg = NULL;
global_ret = EXIT_NOTCONFIGURED;
return;
}
if ( (0 == ass) ||
(ass > INT32_MAX) )
shard_size = 1U + INT32_MAX;
else
shard_size = (uint32_t) ass;
GNUNET_assert (NULL == task);
task = GNUNET_SCHEDULER_add_now (&run_shard,
NULL);
GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
cls);
}
/**
* The main function of the taler-exchange-aggregator.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, non-zero on error, see #global_ret
*/
int
main (int argc,
char *const *argv)
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_timetravel ('T',
"timetravel"),
GNUNET_GETOPT_option_flag ('t',
"test",
"run in test mode and exit when idle",
&test_mode),
GNUNET_GETOPT_option_flag ('y',
"kyc-off",
"perform wire transfers without KYC checks",
&kyc_off),
GNUNET_GETOPT_OPTION_END
};
enum GNUNET_GenericReturnValue ret;
if (GNUNET_OK !=
GNUNET_STRINGS_get_utf8_args (argc, argv,
&argc, &argv))
return EXIT_INVALIDARGUMENT;
TALER_OS_init ();
ret = GNUNET_PROGRAM_run (
argc, argv,
"taler-exchange-aggregator",
gettext_noop (
"background process that aggregates and executes wire transfers"),
options,
&run, NULL);
GNUNET_free_nz ((void *) argv);
if (GNUNET_SYSERR == ret)
return EXIT_INVALIDARGUMENT;
if (GNUNET_NO == ret)
return EXIT_SUCCESS;
return global_ret;
}
/* end of taler-exchange-aggregator.c */