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/*
This file is part of TALER
(C) 2014-2023 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 taler-merchant-httpd_exchanges.h
* @brief logic this HTTPD keeps for each exchange we interact with
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#ifndef TALER_MERCHANT_HTTPD_EXCHANGES_H
#define TALER_MERCHANT_HTTPD_EXCHANGES_H
#include <jansson.h>
#include <gnunet/gnunet_util_lib.h>
#include <curl/curl.h>
#include <taler/taler_util.h>
#include <taler/taler_exchange_service.h>
#include "taler-merchant-httpd.h"
/**
* List of our trusted exchanges in JSON format for inclusion in contracts.
*/
extern json_t *TMH_trusted_exchanges;
/**
* Parses "trusted" exchanges listed in the configuration.
*
* @param cfg the configuration
* @return number of trusted exchanges on success; #GNUNET_SYSERR upon error in
* parsing.
*/
enum GNUNET_GenericReturnValue
TMH_EXCHANGES_init (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Function called to shutdown the exchanges subsystem.
*/
void
TMH_EXCHANGES_done (void);
/**
* Function called with the result of a #TMH_EXCHANGES_find_exchange()
* operation.
*
* @param cls closure
* @param hr HTTP response details
* @param eh handle to the exchange context
* @param exchange_trusted true if this exchange is trusted by config
*/
typedef void
(*TMH_EXCHANGES_FindContinuation)(void *cls,
const struct TALER_EXCHANGE_HttpResponse *hr,
struct TALER_EXCHANGE_Handle *eh,
bool exchange_trusted);
/**
* Information we keep for a pending #MMH_EXCHANGES_find_exchange() operation.
*/
struct TMH_EXCHANGES_FindOperation;
/**
* Find a exchange that matches @a chosen_exchange. If we cannot connect
* to the exchange, or if it is not acceptable, @a fc is called with
* NULL for the exchange.
*
* @param chosen_exchange URL of the exchange we would like to talk to
* @param force_reload set to true to download /wire again even if we already have
* an answer (used if the answer might be stale).
* @param fc function to call with the handles for the exchange
* @param fc_cls closure for @a fc
*/
struct TMH_EXCHANGES_FindOperation *
TMH_EXCHANGES_find_exchange (const char *chosen_exchange,
bool force_reload,
TMH_EXCHANGES_FindContinuation fc,
void *fc_cls);
/**
* Lookup current wire fee by @a exchange_url and
* @a wire_method.
*
* @param exchange_url base URL of the exchange
* @param wire_method wire method to lookup fee by
* @param[out] wire_fee set to the wire fee
* @return #GNUNET_OK on success
* #GNUNET_NO if @a wire_method is not supported
* #GNUNET_SYSERR if @a exchange_url did not yet respond properly to our /wire request
*/
enum GNUNET_GenericReturnValue
TMH_EXCHANGES_lookup_wire_fee (const char *exchange_url,
const char *wire_method,
struct TALER_Amount *wire_fee);
/**
* Abort pending find operation.
*
* @param fo handle to operation to abort
*/
void
TMH_EXCHANGES_find_exchange_cancel (struct TMH_EXCHANGES_FindOperation *fo);
#endif
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