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/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016 GNUnet e.V. and INRIA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
TALER; see the file COPYING.LGPL. If not, see
<http://www.gnu.org/licenses/>
*/
/**
* @file lib/merchant_api_track_transaction.c
* @brief Implementation of the /track/transaction request of the
* merchant's HTTP API
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include <curl/curl.h>
#include <jansson.h>
#include <microhttpd.h> /* just for HTTP status codes */
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include "taler_merchant_service.h"
#include <taler/taler_json_lib.h>
#include <taler/taler_signatures.h>
/**
* @brief A handle for tracking transactions.
*/
struct TALER_MERCHANT_TrackTransactionHandle
{
/**
* The url for this request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_TrackTransactionCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Free data in @a transfers.
*
* @param num_transfers length of the @a transfers array
* @param transfers information about wire transfers to free
*/
static void
free_transfers (unsigned int num_transfers,
struct TALER_MERCHANT_TransactionWireTransfer *transfers)
{
unsigned int i;
for (i=0;i<num_transfers;i++)
GNUNET_free (transfers[i].coins);
}
/**
* Handle #MHD_HTTP_OK response to /track/transaction.
* Parse @a json and if successful call the callback in @a tdo.
*
* @param tdo handle of the operation
* @param json json to parse
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static int
parse_track_transaction_ok (struct TALER_MERCHANT_TrackTransactionHandle *tdo,
const json_t *json)
{
tdo->cb (tdo->cb_cls,
MHD_HTTP_OK,
TALER_EC_NONE,
json);
return GNUNET_OK;
}
/**
* Function called when we're done processing the
* HTTP /track/transaction request.
*
* @param cls the `struct TALER_MERCHANT_TrackTransactionHandle`
* @param response_code HTTP response code, 0 on error
* @param json response body, NULL if not in JSON
*/
static void
handle_track_transaction_finished (void *cls,
long response_code,
const json_t *json)
{
struct TALER_MERCHANT_TrackTransactionHandle *tdo = cls;
tdo->job = NULL;
switch (response_code)
{
case 0:
break;
case MHD_HTTP_OK:
if (GNUNET_OK ==
parse_track_transaction_ok (tdo,
json))
return;
response_code = 0;
break;
case MHD_HTTP_ACCEPTED:
{
/* Expect time stamp of when the transfer is supposed to happen */
}
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify, this should never
happen, we should pass the JSON reply to the application */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Did not find any data\n");
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
GNUNET_break (0);
response_code = 0;
break;
}
tdo->cb (tdo->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
json);
}
/**
* Request backend to return transactions associated with a given wtid.
*
* @param ctx execution context
* @param backend_uri base URI of the backend
* @param instance which merchant instance is going to be tracked
* @param transaction_id which transaction should we trace
* @param track_transaction_cb the callback to call when a reply for this request is available
* @param track_transaction_cb_cls closure for @a track_transaction_cb
* @return a handle for this request
*/
struct TALER_MERCHANT_TrackTransactionHandle *
TALER_MERCHANT_track_transaction (struct GNUNET_CURL_Context *ctx,
const char *backend_uri,
const char *instance,
const char *order_id,
TALER_MERCHANT_TrackTransactionCallback track_transaction_cb,
void *track_transaction_cb_cls)
{
struct TALER_MERCHANT_TrackTransactionHandle *tdo;
CURL *eh;
tdo = GNUNET_new (struct TALER_MERCHANT_TrackTransactionHandle);
tdo->ctx = ctx;
tdo->cb = track_transaction_cb;
tdo->cb_cls = track_transaction_cb_cls;
GNUNET_asprintf (&tdo->url,
"%s/track/transaction?order_id=%s&instance=%s",
backend_uri,
order_id,
instance);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Requesting URI '%s'\n",
tdo->url);
eh = curl_easy_init ();
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
tdo->url));
tdo->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&handle_track_transaction_finished,
tdo);
return tdo;
}
/**
* Cancel a /track/transaction request. This function cannot be used
* on a request handle if a response is already served for it.
*
* @param co the transaction's tracking handle
*/
void
TALER_MERCHANT_track_transaction_cancel (struct TALER_MERCHANT_TrackTransactionHandle *tdo)
{
if (NULL != tdo->job)
{
GNUNET_CURL_job_cancel (tdo->job);
tdo->job = NULL;
}
GNUNET_free (tdo->url);
GNUNET_free (tdo);
}
/* end of merchant_api_track_transaction.c */
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