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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_contract.c
* @brief Implementation of the /history request of the merchant's HTTP API
* @author Marcello Stanisci
*/
#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>
/**
* @brief A Contract Operation Handle
*/
struct TALER_MERCHANT_HistoryOperation
{
/**
* The url for this request, including parameters.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
TALER_MERCHANT_HistoryOperationCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
};
/**
* Cancel a pending /history request
*
* @param handle from the operation to cancel
*/
void
TALER_MERCHANT_history_cancel (struct TALER_MERCHANT_HistoryOperation *ho)
{
if (NULL != ho->job)
{
GNUNET_CURL_job_cancel (ho->job);
ho->job = NULL;
}
GNUNET_free (ho->url);
GNUNET_free (ho);
}
/**
* Function called when we're done processing the
* HTTP /history 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
history_raw_cb (void *cls,
long response_code,
const void *response)
{
struct TALER_MERCHANT_HistoryOperation *ho = cls;
const json_t *json = response;
ho->job = NULL;
switch (response_code)
{
case 0:
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"/history returned response code 0\n");
/**
* The response was malformed or didn't have the
* application/json header.
*/
ho->cb (ho->cb_cls,
response_code,
TALER_EC_INVALID_RESPONSE,
json);
TALER_MERCHANT_history_cancel (ho);
return;
case MHD_HTTP_OK:
ho->cb (ho->cb_cls,
MHD_HTTP_OK,
TALER_EC_NONE,
json);
TALER_MERCHANT_history_cancel (ho);
return;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"/history URL not found\n");
break;
case MHD_HTTP_BAD_REQUEST:
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Wrong/missing URL parameter\n");
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;
}
ho->cb (ho->cb_cls,
response_code,
TALER_JSON_get_error_code (json),
json);
TALER_MERCHANT_history_cancel (ho);
}
/**
* Issue a /history request to the backend.
*
* @param ctx execution context
* @param backend_url base URL of the merchant backend
* @param instance which merchant instance is performing this call
* @param start return `delta` records starting from position `start`.
* If given as zero, then no initial skip of `start` records is done.
* @param delta return `delta` records starting from position `start`
* @param date only transactions younger than/equals to date will be returned
* @param history_cb callback which will work the response gotten from the backend
* @param history_cb_cls closure to pass to @a history_cb
* @return handle for this operation, NULL upon errors
*/
struct TALER_MERCHANT_HistoryOperation *
TALER_MERCHANT_history (struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const char *instance,
unsigned int start,
unsigned int delta,
struct GNUNET_TIME_Absolute date,
TALER_MERCHANT_HistoryOperationCallback history_cb,
void *history_cb_cls)
{
struct TALER_MERCHANT_HistoryOperation *ho;
uint64_t seconds;
CURL *eh;
char *base;
ho = GNUNET_new (struct TALER_MERCHANT_HistoryOperation);
ho->ctx = ctx;
ho->cb = history_cb;
ho->cb_cls = history_cb_cls;
seconds = date.abs_value_us / 1000LL / 1000LL;
base = TALER_url_join (backend_url, "/history", NULL);
GNUNET_asprintf (&ho->url,
"%s?date=%llu&instance=%s&start=%d&delta=%d",
base,
seconds,
instance,
start,
delta);
GNUNET_free (base);
eh = curl_easy_init ();
if (CURLE_OK != curl_easy_setopt (eh,
CURLOPT_URL,
ho->url))
{
GNUNET_break (0);
return NULL;
}
if (NULL == (ho->job = GNUNET_CURL_job_add (ctx,
eh,
GNUNET_YES,
&history_raw_cb,
ho)))
{
GNUNET_break (0);
return NULL;
}
return ho;
}
/* end of merchant_api_contract.c */
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