/*
This file is part of TALER
(C) 2014, 2015, 2016 INRIA
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 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, If not, see
*/
/**
* @file backend/taler-merchant-httpd_track-transaction.c
* @brief implement API for tracking deposits and wire transfers
* @author Marcello Stanisci
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include "taler-merchant-httpd.h"
#include "taler-merchant-httpd_mhd.h"
#include "taler-merchant-httpd_parsing.h"
#include "taler-merchant-httpd_auditors.h"
#include "taler-merchant-httpd_exchanges.h"
#include "taler-merchant-httpd_responses.h"
#include "taler-merchant-httpd_track-transaction.h"
/**
* How long to wait before giving up processing with the exchange?
*/
#define TRACK_TIMEOUT (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30))
/**
* Context for a /track/transaction operation.
*/
struct TrackTransactionContext;
/**
* Merchant instance being tracked
*/
struct MerchantInstance;
/**
* Information we keep for each coin in a /track/transaction operation.
*/
struct TrackCoinContext
{
/**
* Kept in a DLL.
*/
struct TrackCoinContext *next;
/**
* Kept in a DLL.
*/
struct TrackCoinContext *prev;
/**
* Our Context for a /track/transaction operation.
*/
struct TrackTransactionContext *tctx;
/**
* Public key of the coin.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Handle for the request to resolve the WTID for this coin.
*/
struct TALER_EXCHANGE_TrackTransactionHandle *dwh;
/**
* Wire transfer identifier for this coin.
*/
struct TALER_WireTransferIdentifierRawP wtid;
/**
* Execution time of the wire transfer @e wtid.
*/
struct GNUNET_TIME_Absolute execution_time;
/**
* Value of the coin including deposit fee.
*/
struct TALER_Amount amount_with_fee;
/**
* Deposit fee for the coin.
*/
struct TALER_Amount deposit_fee;
/**
* Have we obtained the WTID for this coin yet?
*/
int have_wtid;
};
/**
* Context for a /track/transaction operation.
*/
struct TrackTransactionContext
{
/**
* This field MUST be first.
*/
struct TM_HandlerContext hc;
/**
* HTTP request we are handling.
*/
struct MHD_Connection *connection;
/**
* Kept in a DLL.
*/
struct TrackCoinContext *tcc_head;
/**
* Kept in a DLL.
*/
struct TrackCoinContext *tcc_tail;
/**
* Exchange that was used for the transaction.
*/
char *exchange_uri;
/**
* Task run on timeout.
*/
struct GNUNET_SCHEDULER_Task *timeout_task;
/**
* Handle for operation to lookup /keys (and auditors) from
* the exchange used for this transaction; NULL if no operation is
* pending.
*/
struct TMH_EXCHANGES_FindOperation *fo;
/**
* Handle to our exchange, once we found it.
*/
struct TALER_EXCHANGE_Handle *eh;
/**
* Handle we use to resolve transactions for a given WTID.
*/
struct TALER_EXCHANGE_TrackTransferHandle *wdh;
/**
* Response to return upon resume.
*/
struct MHD_Response *response;
/**
* Wire transfer identifier we are currently looking up in @e wdh.
*/
struct TALER_WireTransferIdentifierRawP current_wtid;
/**
* Execution time of the wire transfer we are currently looking up in @e wdh.
*/
struct GNUNET_TIME_Absolute current_execution_time;
/**
* Hash of wire details for the transaction.
*/
struct GNUNET_HashCode h_wire;
/**
* Hash of the contract.
*/
struct GNUNET_HashCode h_contract;
/**
* Timestamp of the transaction.
*/
struct GNUNET_TIME_Absolute timestamp;
/**
* Refund deadline for the transaction.
*/
struct GNUNET_TIME_Absolute refund_deadline;
/**
* Total value of the transaction.
*/
struct TALER_Amount total_amount;
/**
* Transaction this request is about.
*/
uint64_t transaction_id;
/**
* Response code to return upon resume.
*/
unsigned int response_code;
/**
* Which merchant instance is being tracked
*/
struct MerchantInstance *mi;
};
/**
* Free the @a tctx.
*
* @param tctx data to free
*/
static void
free_tctx (struct TrackTransactionContext *tctx)
{
struct TrackCoinContext *tcc;
while (NULL != (tcc = tctx->tcc_head))
{
GNUNET_CONTAINER_DLL_remove (tctx->tcc_head,
tctx->tcc_tail,
tcc);
if (NULL != tcc->dwh)
{
TALER_EXCHANGE_track_transaction_cancel (tcc->dwh);
tcc->dwh = NULL;
}
GNUNET_free (tcc);
}
if (NULL != tctx->wdh)
{
TALER_EXCHANGE_track_transfer_cancel (tctx->wdh);
tctx->wdh = NULL;
}
if (NULL != tctx->fo)
{
TMH_EXCHANGES_find_exchange_cancel (tctx->fo);
tctx->fo = NULL;
}
if (NULL != tctx->timeout_task)
{
GNUNET_SCHEDULER_cancel (tctx->timeout_task);
tctx->timeout_task = NULL;
}
if (NULL != tctx->exchange_uri)
{
GNUNET_free (tctx->exchange_uri);
tctx->exchange_uri = NULL;
}
GNUNET_free (tctx);
}
/**
* Custom cleanup routine for a `struct TrackTransactionContext`.
*
* @param hc the `struct PayContext` to clean up.
*/
static void
track_transaction_cleanup (struct TM_HandlerContext *hc)
{
struct TrackTransactionContext *tctx = (struct TrackTransactionContext *) hc;
free_tctx (tctx);
}
/**
* Resume the given /track/transaction operation and send the given
* response. Stores the response in the @a tctx and signals MHD to
* resume the connection. Also ensures MHD runs immediately.
*
* @param tctx transaction tracking context
* @param response_code response code to use
* @param response response data to send back
*/
static void
resume_track_transaction_with_response (struct TrackTransactionContext *tctx,
unsigned int response_code,
struct MHD_Response *response)
{
tctx->response_code = response_code;
tctx->response = response;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Resuming /track/transaction handling as exchange interaction is done (%u)\n",
response_code);
if (NULL != tctx->timeout_task)
{
GNUNET_SCHEDULER_cancel (tctx->timeout_task);
tctx->timeout_task = NULL;
}
MHD_resume_connection (tctx->connection);
TMH_trigger_daemon (); /* we resumed, kick MHD */
}
/**
* This function is called to trace the wire transfers for
* all of the coins of the transaction of the @a tctx. Once
* we have traced all coins, we build the response.
*
* @param tctx track context with established connection to exchange
*/
static void
trace_coins (struct TrackTransactionContext *tctx);
/**
* Function called with detailed wire transfer data, including all
* of the coin transactions that were combined into the wire transfer.
*
* We now store this information. Then we check if we still have
* any coins of the original wire transfer not taken care of.
*
* @param cls closure
* @param http_status HTTP status code we got, 0 on exchange protocol violation
* @param exchange_pub public key of the exchange used for signing
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid extracted wire transfer identifier, or NULL if the exchange could
* not provide any (set only if @a http_status is #MHD_HTTP_OK)
* @param total_amount total amount of the wire transfer, or NULL if the exchange could
* not provide any @a wtid (set only if @a http_status is #MHD_HTTP_OK)
* @param details_length length of the @a details array
* @param details array with details about the combined transactions
*/
static void
wire_deposits_cb (void *cls,
unsigned int http_status,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *json,
const struct GNUNET_HashCode *h_wire,
const struct TALER_Amount *total_amount,
unsigned int details_length,
const struct TALER_TrackTransferDetails *details)
{
struct TrackTransactionContext *tctx = cls;
struct TrackCoinContext *tcc;
unsigned int i;
tctx->wdh = NULL;
if (MHD_HTTP_OK != http_status)
{
resume_track_transaction_with_response
(tctx,
MHD_HTTP_FAILED_DEPENDENCY,
TMH_RESPONSE_make_json_pack ("{s:I, s:O}",
"exchange_status", (json_int_t) http_status,
"details", json));
return;
}
if (GNUNET_OK !=
db->store_transfer_to_proof (db->cls,
tctx->exchange_uri,
&tctx->current_wtid,
tctx->current_execution_time,
exchange_pub,
json))
{
/* Not good, but not fatal either, log error and continue */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to store transfer-to-proof mapping in DB\n");
}
for (tcc=tctx->tcc_head;NULL != tcc;tcc=tcc->next)
{
if (GNUNET_YES == tcc->have_wtid)
continue;
for (i=0;icoin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP)))
continue;
tcc->wtid = tctx->current_wtid;
tcc->execution_time = tctx->current_execution_time;
tcc->have_wtid = GNUNET_YES;
if (GNUNET_OK !=
db->store_coin_to_transfer (db->cls,
tctx->transaction_id,
&tcc->coin_pub,
&tctx->current_wtid))
{
/* Not good, but not fatal either, log error and continue */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to store coin-to-transfer mapping in DB\n");
}
}
}
/* Continue tracing (will also handle case that we are done) */
trace_coins (tctx);
}
/**
* Function called with information about a wire transfer identifier.
* We actually never expect this to be called.
*
* @param cls closure
* @param proof proof from exchange about what the wire transfer was for
*/
static void
proof_cb (void *cls,
const json_t *proof)
{
/* FIXME #4577: store @a proof in @a cls to return with error message */
GNUNET_break_op (0);
}
/**
* Function called with detailed wire transfer data.
* We were trying to find out in which wire transfer one of the
* coins was involved in. Now we know. What we do now is first
* obtain the inverse: all other coins of that wire transfer,
* which is what we prefer to store.
*
* @param cls closure with a `struct TrackCoinContext`
* @param http_status HTTP status code we got, 0 on exchange protocol violation
* @param exchange_pub public key of the exchange used for signing @a json
* @param json original json reply (may include signatures, those have then been
* validated already)
* @param wtid wire transfer identifier used by the exchange, NULL if exchange did not
* yet execute the transaction
* @param execution_time actual or planned execution time for the wire transfer
* @param coin_contribution contribution to the @a total_amount of the deposited coin (may be NULL)
*/
static void
wtid_cb (void *cls,
unsigned int http_status,
const struct TALER_ExchangePublicKeyP *exchange_pub,
const json_t *json,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute execution_time,
const struct TALER_Amount *coin_contribution)
{
struct TrackCoinContext *tcc = cls;
struct TrackTransactionContext *tctx = tcc->tctx;
tcc->dwh = NULL;
if (MHD_HTTP_OK != http_status)
{
/* Transaction not resolved for one of the coins, report error!
We keep the status code for #MHD_HTTP_ACCEPTED, but box all the
others (as #MHD_HTTP_ACCEPTED is not an error). */
resume_track_transaction_with_response
(tcc->tctx,
(MHD_HTTP_ACCEPTED == http_status)
? MHD_HTTP_ACCEPTED
: MHD_HTTP_FAILED_DEPENDENCY,
TMH_RESPONSE_make_json_pack ("{s:I, s:O}",
"exchange_status", (json_int_t) http_status,
"details", json));
return;
}
tctx->current_wtid = *wtid;
tctx->current_execution_time = execution_time;
if (GNUNET_YES ==
db->find_proof_by_wtid (db->cls,
tctx->exchange_uri,
wtid,
&proof_cb,
NULL))
{
GNUNET_break_op (0);
/* FIXME #4577: report error: we got this WTID before, and the
transaction was NOT in the list. So exchange is lying to us!
(or our DB is internally inconsistent.) */
}
tctx->wdh = TALER_EXCHANGE_track_transfer (tctx->eh,
wtid,
&wire_deposits_cb,
tctx);
}
/**
* This function is called to trace the wire transfers for
* all of the coins of the transaction of the @a tctx. Once
* we have traced all coins, we build the response.
*
* @param tctx track context with established connection to exchange
*/
static void
trace_coins (struct TrackTransactionContext *tctx)
{
struct TrackCoinContext *tcc;
GNUNET_assert (NULL != tctx->eh);
for (tcc = tctx->tcc_head; NULL != tcc; tcc = tcc->next)
if (GNUNET_YES != tcc->have_wtid)
break;
if (NULL == tcc)
{
unsigned int num_wtid = 0;
/* count how many disjoint wire transfer identifiers there are;
note that there should only usually be one, so while this
is worst-case O(n^2), in pracitce this is O(n) */
for (tcc = tctx->tcc_head; NULL != tcc; tcc = tcc->next)
{
struct TrackCoinContext *tcc2;
int found = GNUNET_NO;
for (tcc2 = tctx->tcc_head; tcc2 != tcc; tcc2 = tcc2->next)
{
if (0 == memcmp (&tcc->wtid,
&tcc2->wtid,
sizeof (struct TALER_WireTransferIdentifierRawP)))
{
found = GNUNET_YES;
break;
}
}
if (GNUNET_NO == found)
num_wtid++;
}
{
/* on-stack allocation is fine, as the number of coins and the
number of wire-transfers per-transaction is expected to be tiny. */
struct MHD_Response *resp;
struct TALER_MERCHANT_TransactionWireTransfer wts[num_wtid];
unsigned int wtid_off;
wtid_off = 0;
for (tcc = tctx->tcc_head; NULL != tcc; tcc = tcc->next)
{
struct TrackCoinContext *tcc2;
int found = GNUNET_NO;
for (tcc2 = tctx->tcc_head; tcc2 != tcc; tcc2 = tcc2->next)
{
if (0 == memcmp (&tcc->wtid,
&tcc2->wtid,
sizeof (struct TALER_WireTransferIdentifierRawP)))
{
found = GNUNET_YES;
break;
}
}
if (GNUNET_NO == found)
{
unsigned int num_coins;
struct TALER_MERCHANT_TransactionWireTransfer *wt;
wt = &wts[wtid_off++];
wt->wtid = tcc->wtid;
wt->execution_time = tcc->execution_time;
/* count number of coins with this wtid */
num_coins = 0;
for (tcc2 = tctx->tcc_head; NULL != tcc2; tcc2 = tcc2->next)
{
if (0 == memcmp (&wt->wtid,
&tcc2->wtid,
sizeof (struct TALER_WireTransferIdentifierRawP)))
num_coins++;
}
/* initialize coins array */
wt->num_coins = num_coins;
wt->coins = GNUNET_new_array (num_coins,
struct TALER_MERCHANT_CoinWireTransfer);
num_coins = 0;
for (tcc2 = tctx->tcc_head; NULL != tcc2; tcc2 = tcc2->next)
{
if (0 == memcmp (&wt->wtid,
&tcc2->wtid,
sizeof (struct TALER_WireTransferIdentifierRawP)))
{
struct TALER_MERCHANT_CoinWireTransfer *coin = &wt->coins[num_coins++];
coin->coin_pub = tcc2->coin_pub;
coin->amount_with_fee = tcc2->amount_with_fee;
coin->deposit_fee = tcc2->deposit_fee;
}
}
} /* GNUNET_NO == found */
} /* for all tcc */
GNUNET_assert (wtid_off == num_wtid);
resp = TMH_RESPONSE_make_track_transaction_ok (num_wtid,
wts);
for (wtid_off=0;wtid_off < num_wtid; wtid_off++)
GNUNET_free (wts[wtid_off].coins);
resume_track_transaction_with_response (tctx,
MHD_HTTP_OK,
resp);
} /* end of scope for 'wts' and 'resp' */
return;
}
tcc->dwh = TALER_EXCHANGE_track_transaction (tctx->eh,
&tctx->mi->privkey,
&tctx->h_wire,
&tctx->h_contract,
&tcc->coin_pub,
tctx->transaction_id,
&wtid_cb,
tcc);
}
/**
* Function called with the result of our exchange lookup.
*
* @param cls the `struct TrackTransactionContext`
* @param eh NULL if exchange was not found to be acceptable
* @param exchange_trusted #GNUNET_YES if this exchange is trusted by config
*/
static void
process_track_transaction_with_exchange (void *cls,
struct TALER_EXCHANGE_Handle *eh,
int exchange_trusted)
{
struct TrackTransactionContext *tctx = cls;
tctx->fo = NULL;
tctx->eh = eh;
trace_coins (tctx);
}
/**
* Handle a timeout for the processing of the track transaction request.
*
* @param cls closure
*/
static void
handle_track_transaction_timeout (void *cls)
{
struct TrackTransactionContext *tctx = cls;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Resuming /track/transaction with error after timeout\n");
tctx->timeout_task = NULL;
if (NULL != tctx->fo)
{
TMH_EXCHANGES_find_exchange_cancel (tctx->fo);
tctx->fo = NULL;
}
resume_track_transaction_with_response (tctx,
MHD_HTTP_SERVICE_UNAVAILABLE,
TMH_RESPONSE_make_internal_error ("exchange not reachable"));
}
/**
* Function called with information about a transaction.
*
* @param cls closure
* @param transaction_id of the contract
* @param exchange_uri URI of the exchange
* @param h_contract hash of the contract
* @param h_wire hash of our wire details
* @param timestamp time of the confirmation
* @param refund refund deadline
* @param total_amount total amount we receive for the contract after fees
*/
static void
transaction_cb (void *cls,
uint64_t transaction_id,
const char *exchange_uri,
const struct GNUNET_HashCode *h_contract,
const struct GNUNET_HashCode *h_wire,
struct GNUNET_TIME_Absolute timestamp,
struct GNUNET_TIME_Absolute refund,
const struct TALER_Amount *total_amount)
{
struct TrackTransactionContext *tctx = cls;
tctx->transaction_id = transaction_id;
tctx->exchange_uri = GNUNET_strdup (exchange_uri);
tctx->h_contract = *h_contract;
tctx->h_wire = *h_wire;
tctx->timestamp = timestamp;
tctx->refund_deadline = refund;
tctx->total_amount = *total_amount;
}
/**
* Information about the wire transfer corresponding to
* a deposit operation. Note that it is in theory possible
* that we have a @a transaction_id and @a coin_pub in the
* result that do not match a deposit that we know about,
* for example because someone else deposited funds into
* our account.
*
* @param cls closure
* @param transaction_id ID of the contract
* @param coin_pub public key of the coin
* @param wtid identifier of the wire transfer in which the exchange
* send us the money for the coin deposit
* @param execution_time when was the wire transfer executed?
* @param exchange_proof proof from exchange about what the deposit was for
* NULL if we have not asked for this signature
*/
static void
transfer_cb (void *cls,
uint64_t transaction_id,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_WireTransferIdentifierRawP *wtid,
struct GNUNET_TIME_Absolute execution_time,
const json_t *exchange_proof)
{
struct TrackCoinContext *tcc = cls;
GNUNET_break (0 == memcmp (coin_pub,
&tcc->coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP)));
tcc->wtid = *wtid;
tcc->execution_time = execution_time;
tcc->have_wtid = GNUNET_YES;
}
/**
* Function called with information about a coin that was deposited.
*
* @param cls closure
* @param transaction_id of the contract
* @param coin_pub public key of the coin
* @param amount_with_fee amount the exchange will deposit for this coin
* @param deposit_fee fee the exchange will charge for this coin
* @param exchange_proof proof from exchange that coin was accepted
*/
static void
coin_cb (void *cls,
uint64_t transaction_id,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
const struct TALER_Amount *amount_with_fee,
const struct TALER_Amount *deposit_fee,
const json_t *exchange_proof)
{
struct TrackTransactionContext *tctx = cls;
struct TrackCoinContext *tcc;
tcc = GNUNET_new (struct TrackCoinContext);
tcc->tctx = tctx;
tcc->coin_pub = *coin_pub;
tcc->amount_with_fee = *amount_with_fee;
tcc->deposit_fee = *deposit_fee;
GNUNET_CONTAINER_DLL_insert (tctx->tcc_head,
tctx->tcc_tail,
tcc);
GNUNET_break (GNUNET_SYSERR !=
db->find_transfers_by_id (db->cls,
transaction_id,
&transfer_cb,
tcc));
}
extern struct MerchantInstance **instances;
/**
* Handle a "/track/transaction" request.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param[in,out] connection_cls the connection's closure (can be updated)
* @param upload_data upload data
* @param[in,out] upload_data_size number of bytes (left) in @a upload_data
* @return MHD result code
*/
int
MH_handler_track_transaction (struct TMH_RequestHandler *rh,
struct MHD_Connection *connection,
void **connection_cls,
const char *upload_data,
size_t *upload_data_size)
{
struct TrackTransactionContext *tctx;
unsigned long long transaction_id;
const char *str;
const char *receiver;
unsigned int i;
int ret;
if (NULL == *connection_cls)
{
tctx = GNUNET_new (struct TrackTransactionContext);
tctx->hc.cc = &track_transaction_cleanup;
tctx->connection = connection;
*connection_cls = tctx;
}
else
{
/* not first call, recover state */
tctx = *connection_cls;
}
if (0 != tctx->response_code)
{
/* We are *done* processing the request, just queue the response (!) */
if (UINT_MAX == tctx->response_code)
{
GNUNET_break (0);
return MHD_NO; /* hard error */
}
ret = MHD_queue_response (connection,
tctx->response_code,
tctx->response);
if (NULL != tctx->response)
{
MHD_destroy_response (tctx->response);
tctx->response = NULL;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Queueing response (%u) for /track/transaction (%s).\n",
(unsigned int) tctx->response_code,
ret ? "OK" : "FAILED");
return ret;
}
if ( (NULL != tctx->fo) ||
(NULL != tctx->eh) )
{
/* likely old MHD version */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Not sure why we are here, should be suspended\n");
return MHD_YES; /* still work in progress */
}
str = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"id");
if (NULL == str)
return TMH_RESPONSE_reply_bad_request (connection,
"id argument missing");
receiver = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"receiver");
if (NULL == receiver)
receiver = "default";
tctx->mi = NULL;
for (i=0; NULL != instances[i]; i++)
if (0 == strcmp (receiver, instances[i]->id))
tctx->mi = instances[i];
if (NULL == tctx->mi)
return TMH_RESPONSE_reply_bad_request (connection,
"unknown receiver");
if (1 !=
sscanf (str,
"%llu",
&transaction_id))
return TMH_RESPONSE_reply_bad_request (connection,
"id argument must be a number");
ret = db->find_transaction_by_id (db->cls,
transaction_id,
&transaction_cb,
tctx);
if (GNUNET_NO == ret)
{
return TMH_RESPONSE_reply_not_found (connection,
"id");
}
if ( (GNUNET_SYSERR == ret) ||
(tctx->transaction_id != (uint64_t) transaction_id) ||
(NULL == tctx->exchange_uri) )
{
GNUNET_break (0);
return TMH_RESPONSE_reply_internal_error (connection,
"Database error");
}
ret = db->find_payments_by_id (db->cls,
transaction_id,
&coin_cb,
tctx);
if (GNUNET_SYSERR == ret)
{
GNUNET_break (0);
return TMH_RESPONSE_reply_internal_error (connection,
"Database error");
}
if (GNUNET_NO == ret)
{
return TMH_RESPONSE_reply_not_found (connection,
"deposits");
}
*connection_cls = tctx;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Suspending /track/transaction handling while working with the exchange\n");
MHD_suspend_connection (connection);
tctx->fo = TMH_EXCHANGES_find_exchange (tctx->exchange_uri,
&process_track_transaction_with_exchange,
tctx);
tctx->timeout_task = GNUNET_SCHEDULER_add_delayed (TRACK_TIMEOUT,
&handle_track_transaction_timeout,
tctx);
return MHD_YES;
}
/* end of taler-merchant-httpd_track-transaction.c */