From 7d4ce3d022d423d3ab8304b52aeee721ab5638e6 Mon Sep 17 00:00:00 2001 From: Christian Grothoff Date: Sat, 30 Jul 2022 10:53:36 +0200 Subject: [PATCH] skeleton for taler-exchange-drain command (#4960) --- src/exchange/Makefile.am | 14 ++ src/exchange/taler-exchange-drain.c | 275 +++++++++++++++++++++++++ src/exchange/taler-exchange-transfer.c | 2 +- 3 files changed, 290 insertions(+), 1 deletion(-) create mode 100644 src/exchange/taler-exchange-drain.c diff --git a/src/exchange/Makefile.am b/src/exchange/Makefile.am index 41083502d..add8948b2 100644 --- a/src/exchange/Makefile.am +++ b/src/exchange/Makefile.am @@ -19,6 +19,7 @@ pkgcfg_DATA = \ bin_PROGRAMS = \ taler-exchange-aggregator \ taler-exchange-closer \ + taler-exchange-drain \ taler-exchange-expire \ taler-exchange-httpd \ taler-exchange-router \ @@ -52,6 +53,19 @@ taler_exchange_closer_LDADD = \ -lgnunetutil \ $(XLIB) +taler_exchange_drain_SOURCES = \ + taler-exchange-drain.c +taler_exchange_drain_LDADD = \ + $(LIBGCRYPT_LIBS) \ + $(top_builddir)/src/json/libtalerjson.la \ + $(top_builddir)/src/util/libtalerutil.la \ + $(top_builddir)/src/bank-lib/libtalerbank.la \ + $(top_builddir)/src/exchangedb/libtalerexchangedb.la \ + -ljansson \ + -lgnunetcurl \ + -lgnunetutil \ + $(XLIB) + taler_exchange_expire_SOURCES = \ taler-exchange-expire.c taler_exchange_expire_LDADD = \ diff --git a/src/exchange/taler-exchange-drain.c b/src/exchange/taler-exchange-drain.c new file mode 100644 index 000000000..71656412e --- /dev/null +++ b/src/exchange/taler-exchange-drain.c @@ -0,0 +1,275 @@ +/* + This file is part of TALER + Copyright (C) 2022 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-drain.c + * @brief Process that drains exchange profits from the escrow account + * and puts them into some regular account of the exchange. + * @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" + + +/** + * 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; + +/** + * Value to return from main(). 0 on success, non-zero on errors. + */ +static int global_ret; + + +/** + * 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; + } + db_plugin->rollback (db_plugin->cls); /* just in case */ + TALER_EXCHANGEDB_plugin_unload (db_plugin); + db_plugin = NULL; + TALER_EXCHANGEDB_unload_accounts (); + cfg = NULL; +} + + +/** + * Parse the configuration for drain. + * + * @return #GNUNET_OK on success + */ +static enum GNUNET_GenericReturnValue +parse_drain_config (void) +{ + 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 + | TALER_EXCHANGEDB_ALO_AUTHDATA)) + { + 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; +} + + +/** + * 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; +} + + +/** + * Execute a wire drain. + * + * @param cls NULL + */ +static void +run_drain (void *cls) +{ + enum GNUNET_DB_QueryStatus qs; + + (void) cls; + task = NULL; + if (GNUNET_OK != + db_plugin->start (db_plugin->cls, + "run drain")) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Failed to start database transaction!\n"); + global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + } +#if 0 + qs = db_plugin->profit_drains_get_pending (db_plugin->cls); +#else + qs = -1; +#endif + switch (qs) + { + case GNUNET_DB_STATUS_HARD_ERROR: + db_plugin->rollback (db_plugin->cls); + GNUNET_break (0); + global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + case GNUNET_DB_STATUS_SOFT_ERROR: + /* try again */ + db_plugin->rollback (db_plugin->cls); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Serialization failure on simple SELECT!?\n"); + global_ret = EXIT_FAILURE; + GNUNET_SCHEDULER_shutdown (); + return; + case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS: + /* no more profit drains, go sleep a bit! */ + db_plugin->rollback (db_plugin->cls); + GNUNET_assert (NULL == task); + GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, + "No profit drains pending. Exiting.\n"); + GNUNET_SCHEDULER_shutdown (); + return; + default: + /* continued below */ + break; + } + // FIXME: check signature (again!) + // FIMXE: display for human check + // FIXME: insert into pre-wire + // FIXME: mark as done + // FIXME: commit transaction + report success + exit + if (0 >= commit_or_warn ()) + GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE, + "Profit drain triggered. Exiting.\n"); + GNUNET_SCHEDULER_shutdown (); +} + + +/** + * 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) +{ + (void) cls; + (void) args; + (void) cfgfile; + + cfg = c; + if (GNUNET_OK != parse_drain_config ()) + { + cfg = NULL; + global_ret = EXIT_NOTCONFIGURED; + return; + } + 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; + } + GNUNET_assert (NULL == task); + task = GNUNET_SCHEDULER_add_now (&run_drain, + NULL); + GNUNET_SCHEDULER_add_shutdown (&shutdown_task, + cls); +} + + +/** + * The main function of the taler-exchange-drain. + * + * @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_version (VERSION "-" VCS_VERSION), + 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-drain", + gettext_noop ( + "process that executes a single profit drain"), + 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-drain.c */ diff --git a/src/exchange/taler-exchange-transfer.c b/src/exchange/taler-exchange-transfer.c index 011da6b57..f4395a55a 100644 --- a/src/exchange/taler-exchange-transfer.c +++ b/src/exchange/taler-exchange-transfer.c @@ -264,7 +264,7 @@ shutdown_task (void *cls) /** - * Parse the configuration for wirewatch. + * Parse the configuration for taler-exchange-transfer. * * @return #GNUNET_OK on success */