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/*
This file is part of TALER
Copyright (C) 2014-2020 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 <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_reserves_get.c
* @brief Handle /reserves/$RESERVE_PUB GET requests
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include "taler_mhd_lib.h"
#include "taler_json_lib.h"
#include "taler-exchange-httpd_reserves_get.h"
#include "taler-exchange-httpd_responses.h"
/**
* Reserve GET request that is long-polling.
*/
struct ReservePoller
{
/**
* Kept in a DLL.
*/
struct ReservePoller *next;
/**
* Kept in a DLL.
*/
struct ReservePoller *prev;
/**
* Connection we are handling.
*/
struct MHD_Connection *connection;
/**
* Entry in the timeout heap.
*/
struct GNUNET_CONTAINER_HeapNode *hn;
/**
* Subscription for the database event we are
* waiting for.
*/
struct GNUNET_DB_EventHandler *eh;
/**
* When will this request time out?
*/
struct GNUNET_TIME_Absolute timeout;
};
/**
* Send reserve history to client.
*
* @param connection connection to the client
* @param rh reserve history to return
* @return MHD result code
*/
static MHD_RESULT
reply_reserve_history_success (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_ReserveHistory *rh)
{
json_t *json_history;
struct TALER_Amount balance;
json_history = TEH_RESPONSE_compile_reserve_history (rh,
&balance);
if (NULL == json_history)
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_JSON_ALLOCATION_FAILURE,
NULL);
return TALER_MHD_REPLY_JSON_PACK (
connection,
MHD_HTTP_OK,
TALER_JSON_pack_amount ("balance",
&balance),
GNUNET_JSON_pack_array_steal ("history",
json_history));
}
/**
* Closure for #reserve_history_transaction.
*/
struct ReserveHistoryContext
{
/**
* Public key of the reserve the inquiry is about.
*/
struct TALER_ReservePublicKeyP reserve_pub;
/**
* History of the reserve, set in the callback.
*/
struct TALER_EXCHANGEDB_ReserveHistory *rh;
};
/**
* Function implementing /reserves/ GET transaction.
* Execute a /reserves/ GET. Given the public key of a reserve,
* return the associated transaction history. Runs the
* transaction logic; IF it returns a non-error code, the transaction
* logic MUST NOT queue a MHD response. IF it returns an hard error,
* the transaction logic MUST queue a MHD response and set @a mhd_ret.
* IF it returns the soft error code, the function MAY be called again
* to retry and MUST not queue a MHD response.
*
* @param cls a `struct ReserveHistoryContext *`
* @param connection MHD request which triggered the transaction
* @param session database session to use
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!); unused
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
reserve_history_transaction (void *cls,
struct MHD_Connection *connection,
struct TALER_EXCHANGEDB_Session *session,
MHD_RESULT *mhd_ret)
{
struct ReserveHistoryContext *rsc = cls;
(void) connection;
(void) mhd_ret;
return TEH_plugin->get_reserve_history (TEH_plugin->cls,
session,
&rsc->reserve_pub,
&rsc->rh);
}
MHD_RESULT
TEH_handler_reserves_get (struct TEH_RequestContext *rc,
const char *const args[1])
{
struct ReserveHistoryContext rsc;
MHD_RESULT mhd_ret;
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[0],
strlen (args[0]),
&rsc.reserve_pub,
sizeof (rsc.reserve_pub)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_MERCHANT_GENERIC_RESERVE_PUB_MALFORMED,
args[0]);
}
rsc.rh = NULL;
if (GNUNET_OK !=
TEH_DB_run_transaction (rc->connection,
"get reserve history",
&mhd_ret,
&reserve_history_transaction,
&rsc))
return mhd_ret;
/* generate proper response */
if (NULL == rsc.rh)
return TALER_MHD_reply_with_error (rc->connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_EXCHANGE_RESERVES_GET_STATUS_UNKNOWN,
args[0]);
mhd_ret = reply_reserve_history_success (rc->connection,
rsc.rh);
TEH_plugin->free_reserve_history (TEH_plugin->cls,
rsc.rh);
return mhd_ret;
}
/* end of taler-exchange-httpd_reserves_get.c */
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