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-rw-r--r--src/mint/taler-mint-aggregator.c914
1 files changed, 914 insertions, 0 deletions
diff --git a/src/mint/taler-mint-aggregator.c b/src/mint/taler-mint-aggregator.c
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--- /dev/null
+++ b/src/mint/taler-mint-aggregator.c
@@ -0,0 +1,914 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2016 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, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @file taler-mint-aggregator.c
+ * @brief Process that aggregates outgoing transactions and executes them
+ * @author Christian Grothoff
+ *
+ * TODO:
+ * - simplify global_ret: make it a global!
+ * - handle shutdown more nicely (call 'cancel' method on wire transfers)
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+#include <jansson.h>
+#include <pthread.h>
+#include "taler_mintdb_lib.h"
+#include "taler_mintdb_plugin.h"
+#include "taler_wire_lib.h"
+
+/**
+ * Which currency is used by this mint?
+ */
+static char *mint_currency_string;
+
+/**
+ * Which wireformat should be supported by this aggregator?
+ */
+static char *mint_wireformat;
+
+/**
+ * Base directory of the mint (global)
+ */
+static char *mint_directory;
+
+/**
+ * The mint's configuration (global)
+ */
+static struct GNUNET_CONFIGURATION_Handle *cfg;
+
+/**
+ * Our DB plugin.
+ */
+static struct TALER_MINTDB_Plugin *db_plugin;
+
+/**
+ * Our wire plugin.
+ */
+static struct TALER_WIRE_Plugin *wire_plugin;
+
+/**
+ * Task for the main #run() function.
+ */
+static struct GNUNET_SCHEDULER_Task *task;
+
+/**
+ * Limit on the number of transactions we aggregate at once. Note
+ * that the limit must be big enough to ensure that when transactions
+ * of the smallest possible unit are aggregated, they do surpass the
+ * "tiny" threshold beyond which we never trigger a wire transaction!
+ *
+ * TODO: make configurable (via config file or command line option)
+ */
+static unsigned int aggregation_limit = 10000;
+
+
+/**
+ * Load configuration parameters for the mint
+ * server into the corresponding global variables.
+ *
+ * @param mint_directory the mint's directory
+ * @return #GNUNET_OK on success
+ */
+static int
+mint_serve_process_config (const char *mint_directory)
+{
+ char *type;
+
+ cfg = TALER_config_load (mint_directory);
+ if (NULL == cfg)
+ {
+ fprintf (stderr,
+ "Failed to load mint configuration\n");
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "mint",
+ "currency",
+ &mint_currency_string))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "mint",
+ "currency");
+ return GNUNET_SYSERR;
+ }
+ if (strlen (mint_currency_string) >= TALER_CURRENCY_LEN)
+ {
+ fprintf (stderr,
+ "Currency `%s' longer than the allowed limit of %u characters.",
+ mint_currency_string,
+ (unsigned int) TALER_CURRENCY_LEN);
+ return GNUNET_SYSERR;
+ }
+ if (NULL != mint_wireformat)
+ GNUNET_CONFIGURATION_set_value_string (cfg,
+ "mint",
+ "wireformat",
+ mint_wireformat);
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "mint",
+ "wireformat",
+ &type))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "mint",
+ "wireformat");
+ return GNUNET_SYSERR;
+ }
+
+ if (NULL ==
+ (db_plugin = TALER_MINTDB_plugin_load (cfg)))
+ {
+ fprintf (stderr,
+ "Failed to initialize DB subsystem\n");
+ GNUNET_free (type);
+ return GNUNET_SYSERR;
+ }
+
+ if (NULL ==
+ (wire_plugin = TALER_WIRE_plugin_load (cfg,
+ type)))
+ {
+ fprintf (stderr,
+ "Failed to load wire plugin for `%s'\n",
+ type);
+ GNUNET_free (type);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_free (type);
+
+ return GNUNET_OK;
+}
+
+
+/**
+ * Information about one aggregation process to
+ * be executed.
+ */
+struct AggregationUnit
+{
+ /**
+ * Public key of the merchant.
+ */
+ struct TALER_MerchantPublicKeyP merchant_pub;
+
+ /**
+ * Total amount to be transferred.
+ */
+ struct TALER_Amount total_amount;
+
+ /**
+ * Hash of @e wire.
+ */
+ struct GNUNET_HashCode h_wire;
+
+ /**
+ * Wire transfer identifier we use.
+ */
+ struct TALER_WireTransferIdentifierRawP wtid;
+
+ /**
+ * Row ID of the transaction that started it all.
+ */
+ unsigned long long row_id;
+
+ /**
+ * The current time.
+ */
+ struct GNUNET_TIME_Absolute execution_time;
+
+ /**
+ * Wire details of the merchant.
+ */
+ json_t *wire;
+
+ /**
+ * Database session for all of our transactions.
+ */
+ struct TALER_MINTDB_Session *session;
+
+ /**
+ * Wire preparation handle.
+ */
+ struct TALER_WIRE_PrepareHandle *ph;
+
+ /**
+ * Array of #aggregation_limit row_ids from the
+ * aggregation.
+ */
+ unsigned long long *additional_rows;
+
+ /**
+ * Pointer to global return value. Closure for #run().
+ */
+ int *global_ret;
+
+ /**
+ * Offset specifying how many #additional_rows are in use.
+ */
+ unsigned int rows_offset;
+
+ /**
+ * Set to #GNUNET_YES if we have to abort due to failure.
+ */
+ int failed;
+
+};
+
+
+/**
+ * Function called with details about deposits that have been made,
+ * with the goal of executing the corresponding wire transaction.
+ *
+ * @param cls closure with the `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 mint gets to keep as transaction fees
+ * @param transaction_id unique transaction ID chosen by the merchant
+ * @param h_contract hash of the contract between merchant and customer
+ * @param wire_deadline by which the merchant adviced that he would like the
+ * wire transfer to be executed
+ * @param wire wire details for the merchant
+ * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
+ */
+static int
+deposit_cb (void *cls,
+ unsigned long long 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,
+ uint64_t transaction_id,
+ const struct GNUNET_HashCode *h_contract,
+ struct GNUNET_TIME_Absolute wire_deadline,
+ const json_t *wire)
+{
+ struct AggregationUnit *au = cls;
+
+ au->merchant_pub = *merchant_pub;
+ if (GNUNET_OK !=
+ TALER_amount_subtract (&au->total_amount,
+ amount_with_fee,
+ deposit_fee))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Fatally malformed record at %llu\n",
+ row_id);
+ return GNUNET_SYSERR;
+ }
+ au->row_id = row_id;
+ au->wire = (json_t *) wire;
+ au->execution_time = GNUNET_TIME_absolute_get ();
+ TALER_hash_json (au->wire,
+ &au->h_wire);
+ json_incref (au->wire);
+ GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
+ &au->wtid,
+ sizeof (au->wtid));
+ if (GNUNET_OK !=
+ db_plugin->insert_aggregation_tracking (db_plugin->cls,
+ au->session,
+ &au->wtid,
+ merchant_pub,
+ &au->h_wire,
+ h_contract,
+ transaction_id,
+ au->execution_time,
+ coin_pub,
+ amount_with_fee,
+ deposit_fee))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ db_plugin->mark_deposit_done (db_plugin->cls,
+ au->session,
+ row_id))
+ {
+ GNUNET_break (0);
+ au->failed = GNUNET_YES;
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+
+/**
+ * Function called with details about another deposit we
+ * can aggregate into an existing aggregation unit.
+ *
+ * @param cls closure with the `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 mint gets to keep as transaction fees
+ * @param transaction_id unique transaction ID chosen by the merchant
+ * @param h_contract hash of the contract between merchant and customer
+ * @param wire_deadline by which the merchant adviced that he would like the
+ * wire transfer to be executed
+ * @param wire wire details for the merchant
+ * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
+ */
+static int
+aggregate_cb (void *cls,
+ unsigned long long 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,
+ uint64_t transaction_id,
+ const struct GNUNET_HashCode *h_contract,
+ struct GNUNET_TIME_Absolute wire_deadline,
+ const json_t *wire)
+{
+ struct AggregationUnit *au = cls;
+ struct TALER_Amount delta;
+
+ GNUNET_break (0 ==
+ memcmp (&au->merchant_pub,
+ merchant_pub,
+ sizeof (struct TALER_MerchantPublicKeyP)));
+ /* compute contribution of this coin after fees */
+ if (GNUNET_OK !=
+ TALER_amount_subtract (&delta,
+ amount_with_fee,
+ deposit_fee))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Fatally malformed record at %llu\n",
+ row_id);
+ return GNUNET_SYSERR;
+ }
+ /* add to total */
+ if (GNUNET_OK !=
+ TALER_amount_add (&au->total_amount,
+ &au->total_amount,
+ &delta))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Overflow or currency incompatibility during aggregation at %llu\n",
+ row_id);
+ /* Skip this one, but keep going! */
+ return GNUNET_OK;
+ }
+ if (au->rows_offset >= aggregation_limit)
+ {
+ /* Bug: we asked for at most #aggregation_limit results! */
+ GNUNET_break (0);
+ /* Skip this one, but keep going. */
+ return GNUNET_OK;
+ }
+ if (NULL == au->additional_rows)
+ au->additional_rows = GNUNET_new_array (aggregation_limit,
+ unsigned long long);
+ /* "append" to our list of rows */
+ au->additional_rows[au->rows_offset++] = row_id;
+ /* insert into aggregation tracking table */
+ if (GNUNET_OK !=
+ db_plugin->insert_aggregation_tracking (db_plugin->cls,
+ au->session,
+ &au->wtid,
+ merchant_pub,
+ &au->h_wire,
+ h_contract,
+ transaction_id,
+ au->execution_time,
+ coin_pub,
+ amount_with_fee,
+ deposit_fee))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK !=
+ db_plugin->mark_deposit_done (db_plugin->cls,
+ au->session,
+ row_id))
+ {
+ GNUNET_break (0);
+ au->failed = GNUNET_YES;
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function to be called with the prepared transfer data.
+ *
+ * @param cls closure with the `struct AggregationUnit`
+ * @param buf transaction data to persist, NULL on error
+ * @param buf_size number of bytes in @a buf, 0 on error
+ */
+static void
+prepare_cb (void *cls,
+ const char *buf,
+ size_t buf_size);
+
+
+/**
+ * Main work function that queries the DB and aggregates transactions
+ * into larger wire transfers.
+ *
+ * @param cls pointer to an `int` which we will return from main()
+ * @param tc scheduler context
+ */
+static void
+run_aggregation (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ int *global_ret = cls;
+ struct TALER_MINTDB_Session *session;
+ struct AggregationUnit *au;
+ unsigned int i;
+ int ret;
+
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ if (NULL == (session = db_plugin->get_session (db_plugin->cls,
+ GNUNET_NO)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to obtain database session!\n");
+ *global_ret = GNUNET_SYSERR;
+ 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;
+ return;
+ }
+ au = GNUNET_new (struct AggregationUnit);
+ au->session = session;
+ ret = db_plugin->get_ready_deposit (db_plugin->cls,
+ session,
+ &deposit_cb,
+ au);
+ if (GNUNET_OK != ret)
+ {
+ GNUNET_free (au);
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ if (0 != ret)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to execute deposit iteration!\n");
+ *global_ret = GNUNET_SYSERR;
+ return;
+ }
+ /* nothing to do, sleep for a minute and try again */
+ task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
+ &run_aggregation,
+ global_ret);
+ return;
+ }
+ /* Now try to find other deposits to aggregate */
+ ret = db_plugin->iterate_matching_deposits (db_plugin->cls,
+ session,
+ &au->h_wire,
+ &au->merchant_pub,
+ &aggregate_cb,
+ au,
+ aggregation_limit);
+ if ( (GNUNET_SYSERR == ret) ||
+ (GNUNET_YES == au->failed) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to execute deposit iteration!\n");
+ GNUNET_free_non_null (au->additional_rows);
+ GNUNET_free (au);
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ *global_ret = GNUNET_SYSERR;
+ return;
+ }
+ /* Round to the unit supported by the wire transfer method */
+ GNUNET_assert (GNUNET_SYSERR !=
+ wire_plugin->amount_round (wire_plugin->cls,
+ &au->total_amount));
+ /* Check if after rounding down, we still have an amount to transfer */
+ if ( (0 == au->total_amount.value) &&
+ (0 == au->total_amount.fraction) )
+ {
+ /* 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,
+ session);
+ /* Start another transaction to mark all* of the selected deposits
+ *as minor! */
+ 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_free_non_null (au->additional_rows);
+ GNUNET_free (au);
+ return;
+ }
+ /* Mark transactions by row_id as minor */
+ ret = GNUNET_OK;
+ if (GNUNET_OK !=
+ db_plugin->mark_deposit_tiny (db_plugin->cls,
+ session,
+ au->row_id))
+ ret = GNUNET_SYSERR;
+ else
+ for (i=0;i<au->rows_offset;i++)
+ if (GNUNET_OK !=
+ db_plugin->mark_deposit_tiny (db_plugin->cls,
+ session,
+ au->additional_rows[i]))
+ ret = GNUNET_SYSERR;
+ /* commit */
+ if (GNUNET_OK !=
+ db_plugin->commit (db_plugin->cls,
+ session))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Failed to commit database transaction!\n");
+ }
+ GNUNET_free_non_null (au->additional_rows);
+ GNUNET_free (au);
+ /* start again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+ au->global_ret = global_ret;
+ au->ph = wire_plugin->prepare_wire_transfer (wire_plugin->cls,
+ au->wire,
+ &au->total_amount,
+ &au->wtid,
+ &prepare_cb,
+ au);
+ /* FIXME: currently we have no clean-up plan on
+ shutdown to call prepare_wire_transfer_cancel!
+ Maybe make 'au' global? */
+ if (NULL == au->ph)
+ {
+ GNUNET_break (0); /* why? how to best recover? */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ GNUNET_free_non_null (au->additional_rows);
+ GNUNET_free (au);
+ /* start again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+ /* otherwise we continue with #prepare_cb(), see below */
+}
+
+
+/**
+ * Execute the wire transfers that we have committed to
+ * do.
+ *
+ * @param cls pointer to an `int` which we will return from main()
+ * @param tc scheduler context
+ */
+static void
+run_transfers (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * Function to be called with the prepared transfer data.
+ *
+ * @param cls closure with the `struct AggregationUnit`
+ * @param buf transaction data to persist, NULL on error
+ * @param buf_size number of bytes in @a buf, 0 on error
+ */
+static void
+prepare_cb (void *cls,
+ const char *buf,
+ size_t buf_size)
+{
+ struct AggregationUnit *au = cls;
+ int *global_ret = au->global_ret;
+ struct TALER_MINTDB_Session *session = au->session;
+
+ GNUNET_free_non_null (au->additional_rows);
+ GNUNET_free (au);
+ if (NULL == buf)
+ {
+ GNUNET_break (0); /* why? how to best recover? */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ /* start again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+
+ /* Commit our intention to execute the wire transfer! */
+ if (GNUNET_OK !=
+ db_plugin->wire_prepare_data_insert (db_plugin->cls,
+ session,
+ mint_wireformat,
+ buf,
+ buf_size))
+ {
+ GNUNET_break (0); /* why? how to best recover? */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ /* start again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+
+ /* Now we can finally commit the overall transaction, as we are
+ again consistent if all of this passes. */
+ if (GNUNET_OK !=
+ db_plugin->commit (db_plugin->cls,
+ session))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Failed to commit database transaction!\n");
+ /* try again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+
+ /* run alternative task: actually do wire transfer! */
+ task = GNUNET_SCHEDULER_add_now (&run_transfers,
+ &global_ret);
+}
+
+
+/**
+ * Data we keep to #run_transfers().
+ */
+struct WirePrepareData
+{
+
+ /**
+ * Database session for all of our transactions.
+ */
+ struct TALER_MINTDB_Session *session;
+
+ /**
+ * Wire execution handle.
+ */
+ struct TALER_WIRE_ExecuteHandle *eh;
+
+ /**
+ * Pointer to global return value. Closure for #run().
+ */
+ int *global_ret;
+
+
+ /**
+ * Row ID of the transfer.
+ */
+ unsigned long long row_id;
+
+};
+
+
+/**
+ * Function called with the result from the execute step.
+ *
+ * @param cls closure with the `struct WirePrepareData`
+ * @param success #GNUNET_OK on success, #GNUNET_SYSERR on failure
+ * @param emsg NULL on success, otherwise an error message
+ */
+static void
+wire_confirm_cb (void *cls,
+ int success,
+ const char *emsg)
+{
+ struct WirePrepareData *wpd = cls;
+ int *global_ret = wpd->global_ret;
+ struct TALER_MINTDB_Session *session = wpd->session;
+
+ wpd->eh = NULL;
+ if (GNUNET_SYSERR == success)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Wire transaction failed: %s\n",
+ emsg);
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ *global_ret = GNUNET_SYSERR;
+ GNUNET_free (wpd);
+ return;
+ }
+ if (GNUNET_OK !=
+ db_plugin->wire_prepare_data_mark_finished (db_plugin->cls,
+ session,
+ wpd->row_id))
+ {
+ GNUNET_break (0); /* why!? */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ *global_ret = GNUNET_SYSERR;
+ GNUNET_free (wpd);
+ return;
+ }
+ GNUNET_free (wpd);
+ if (GNUNET_OK !=
+ db_plugin->commit (db_plugin->cls,
+ session))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Failed to commit database transaction!\n");
+ /* try again */
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ return;
+ }
+ /* continue with #run_transfers(), just to guard
+ against the unlikely case that there are more. */
+ task = GNUNET_SCHEDULER_add_now (&run_transfers,
+ &global_ret);
+
+}
+
+
+/**
+ * Callback with data about a prepared transaction.
+ *
+ * @param cls closure with the `struct WirePrepareData`
+ * @param rowid row identifier used to mark prepared transaction as done
+ * @param buf transaction data that was persisted, NULL on error
+ * @param buf_size number of bytes in @a buf, 0 on error
+ */
+static void
+wire_prepare_cb (void *cls,
+ unsigned long long rowid,
+ const char *buf,
+ size_t buf_size)
+{
+ struct WirePrepareData *wpd = cls;
+ int *global_ret = wpd->global_ret;
+
+ wpd->row_id = rowid;
+ wpd->eh = wire_plugin->execute_wire_transfer (wire_plugin->cls,
+ buf,
+ buf_size,
+ &wire_confirm_cb,
+ wpd);
+ /* FIXME: currently we have no clean-up plan on
+ shutdown to call execute_wire_transfer_cancel!
+ Maybe make 'wpd' global? */
+ if (NULL == wpd->eh)
+ {
+ GNUNET_break (0); /* why? how to best recover? */
+ db_plugin->rollback (db_plugin->cls,
+ wpd->session);
+ *global_ret = GNUNET_SYSERR;
+ GNUNET_free (wpd);
+ return;
+ }
+}
+
+
+/**
+ * Execute the wire transfers that we have committed to
+ * do.
+ *
+ * @param cls pointer to an `int` which we will return from main()
+ * @param tc scheduler context
+ */
+static void
+run_transfers (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ int *global_ret = cls;
+ int ret;
+ struct WirePrepareData *wpd;
+ struct TALER_MINTDB_Session *session;
+
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ if (NULL == (session = db_plugin->get_session (db_plugin->cls,
+ GNUNET_NO)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to obtain database session!\n");
+ *global_ret = GNUNET_SYSERR;
+ 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;
+ return;
+ }
+ wpd = GNUNET_new (struct WirePrepareData);
+ wpd->session = session;
+ wpd->global_ret = global_ret;
+ ret = db_plugin->wire_prepare_data_get (db_plugin->cls,
+ session,
+ mint_wireformat,
+ &wire_prepare_cb,
+ wpd);
+ if (GNUNET_SYSERR == ret)
+ {
+ GNUNET_break (0); /* why? how to best recover? */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ *global_ret = GNUNET_SYSERR;
+ GNUNET_free (wpd);
+ return;
+ }
+ if (GNUNET_NO == ret)
+ {
+ /* no more prepared wire transfers, go back to aggregation! */
+ db_plugin->rollback (db_plugin->cls,
+ session);
+ task = GNUNET_SCHEDULER_add_now (&run_aggregation,
+ global_ret);
+ GNUNET_free (wpd);
+ return;
+ }
+ /* otherwise, continues in #wire_prepare_cb() */
+}
+
+
+/**
+ * The main function of the taler-mint-httpd server ("the mint").
+ *
+ * @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)
+{
+ static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+ {'d', "mint-dir", "DIR",
+ "mint directory with configuration and keys for operating the mint", 1,
+ &GNUNET_GETOPT_set_filename, &mint_directory},
+ {'f', "format", "WIREFORMAT",
+ "wireformat to use, overrides WIREFORMAT option in [mint] section", 1,
+ &GNUNET_GETOPT_set_filename, &mint_wireformat},
+ TALER_GETOPT_OPTION_HELP ("background process that aggregates and executes wire transfers to merchants"),
+ GNUNET_GETOPT_OPTION_VERSION (VERSION "-" VCS_VERSION),
+ GNUNET_GETOPT_OPTION_END
+ };
+ int ret = GNUNET_OK;
+
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_log_setup ("taler-mint-aggregator",
+ "INFO",
+ NULL));
+ if (0 >=
+ GNUNET_GETOPT_run ("taler-mint-aggregator",
+ options,
+ argc, argv))
+ return 1;
+ if (NULL == mint_directory)
+ {
+ fprintf (stderr,
+ "Mint directory not specified\n");
+ return 1;
+ }
+ if (GNUNET_OK !=
+ mint_serve_process_config (mint_directory))
+ {
+ return 1;
+ }
+
+ GNUNET_SCHEDULER_run (&run_transfers, &ret);
+
+ TALER_MINTDB_plugin_unload (db_plugin);
+ TALER_WIRE_plugin_unload (wire_plugin);
+ return (GNUNET_SYSERR == ret) ? 1 : 0;
+}
+
+/* end of taler-mint-aggregator.c */