delete unused filev0.8.0-dev.2

2 files changed, 0 insertions, 1297 deletions

diff --git a/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.c b/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.c
deleted file mode 100644
index 6fc8e167..00000000
--- a/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.c
+++ /dev/null
@@ -1,1250 +0,0 @@
-/*
-  This file is part of TALER
-  (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 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_track-transaction.c
- * @brief implement API for tracking deposits and wire transfers
- * @author Marcello Stanisci
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <jansson.h>
-#include <taler/taler_signatures.h>
-#include <taler/taler_json_lib.h>
-#include "taler-merchant-httpd.h"
-#include "taler_merchant_service.h"
-#include "taler-merchant-httpd_mhd.h"
-#include "taler-merchant-httpd_auditors.h"
-#include "taler-merchant-httpd_exchanges.h"
-#include "taler-merchant-httpd_track-transaction.h"
-
-
-/**
- * Information about a wire transfer for a /track/transaction response.
- */
-struct TransactionWireTransfer
-{
-
-  /**
-   * Wire transfer identifier this struct is about.
-   */
-  struct TALER_WireTransferIdentifierRawP wtid;
-
-  /**
-   * When was this wire transfer executed?
-   */
-  struct GNUNET_TIME_Absolute execution_time;
-
-  /**
-   * Number of coins of the selected transaction that
-   * is covered by this wire transfer.
-   */
-  unsigned int num_coins;
-
-  /**
-   * Information about the coins of the selected transaction
-   * that are part of the wire transfer.
-   */
-  struct TALER_MERCHANT_CoinWireTransfer *coins;
-
-  /**
-   * URL of the exchange that executed the wire transfer.
-   */
-  char *exchange_url;
-};
-
-
-/**
- * Map containing all the known merchant instances
- */
-extern struct GNUNET_CONTAINER_MultiHashMap *by_id_map;
-
-/**
- * How long to wait before giving up processing with the exchange?
- */
-#define TRACK_TIMEOUT (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, \
-                                                      30))
-
-/**
- * How often do we retry the simple INSERT database transaction?
- */
-#define MAX_RETRIES 3
-
-
-/**
- * Generate /track/transaction response.
- *
- * @param num_transfers how many wire transfers make up the transaction
- * @param transfers data on each wire transfer
- * @return MHD response object
- */
-static struct MHD_Response *
-make_track_transaction_ok (unsigned int num_transfers,
-                           const struct TransactionWireTransfer *transfers)
-{
-  json_t *j_transfers;
-
-  j_transfers = json_array ();
-  for (unsigned int i = 0; i<num_transfers; i++)
-  {
-    const struct TransactionWireTransfer *transfer = &transfers[i];
-    struct TALER_Amount sum;
-
-    sum = transfer->coins[0].amount_with_fee;
-    for (unsigned int j = 1; j<transfer->num_coins; j++)
-    {
-      const struct TALER_MERCHANT_CoinWireTransfer *coin = &transfer->coins[j];
-
-      GNUNET_assert (0 <=
-                     TALER_amount_add (&sum,
-                                       &sum,
-                                       &coin->amount_with_fee));
-    }
-
-    GNUNET_assert (0 ==
-                   json_array_append_new (
-                     j_transfers,
-                     json_pack (
-                       "{s:s, s:o, s:o, s:o}",
-                       "exchange",
-                       transfer->exchange_url,
-                       "wtid",
-                       GNUNET_JSON_from_data_auto (&transfer->wtid),
-                       "execution_time",
-                       GNUNET_JSON_from_time_abs (transfer->execution_time),
-                       "amount",
-                       TALER_JSON_from_amount (&sum))));
-  }
-  {
-    struct MHD_Response *ret;
-
-    ret = TALER_MHD_make_json (j_transfers);
-    json_decref (j_transfers);
-    return ret;
-  }
-}
-
-
-/**
- * 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;
-
-  /**
-   * Exchange that was used for the transaction.
-   */
-  char *exchange_url;
-
-  /**
-   * Handle for the request to resolve the WTID for this coin.
-   */
-  struct TALER_EXCHANGE_DepositGetHandle *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;
-
-  /**
-   * 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;
-
-  /**
-   * URL of the exchange we currently have in @e eh.
-   */
-  const char *current_exchange;
-
-  /**
-   * Handle we use to resolve transactions for a given WTID.
-   */
-  struct TALER_EXCHANGE_TransfersGetHandle *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;
-
-  /**
-   * 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.
-   */
-  const char *transaction_id;
-
-  /**
-   *  Proposal's hashcode.
-   */
-  struct GNUNET_HashCode h_contract_terms;
-
-  /**
-   * Response code to return upon resume.
-   */
-  unsigned int response_code;
-
-  /**
-   * Which merchant instance is being tracked
-   */
-  struct MerchantInstance *mi;
-
-  /**
-   * Set to negative values in #coin_cb() if we encounter
-   * a database problem.
-   */
-  enum GNUNET_DB_QueryStatus qs;
-
-};
-
-
-/**
- * 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_deposits_get_cancel (tcc->dwh);
-      tcc->dwh = NULL;
-    }
-    if (NULL != tcc->exchange_url)
-    {
-      GNUNET_free (tcc->exchange_url);
-      tcc->exchange_url = NULL;
-    }
-    GNUNET_free (tcc);
-  }
-  if (NULL != tctx->wdh)
-  {
-    TALER_EXCHANGE_transfers_get_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;
-  }
-  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 hr HTTP response details
- * @param exchange_pub public key of the exchange used for signing
- * @param execution_time time when the exchange claims to have performed the wire transfer
- * @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 wire_fee wire fee that was charged by the exchange
- * @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,
-                  const struct TALER_EXCHANGE_HttpResponse *hr,
-                  const struct TALER_ExchangePublicKeyP *exchange_pub,
-                  const struct GNUNET_HashCode *h_wire,
-                  struct GNUNET_TIME_Absolute execution_time,
-                  const struct TALER_Amount *total_amount,
-                  const struct TALER_Amount *wire_fee,
-                  unsigned int details_length,
-                  const struct TALER_TrackTransferDetails *details)
-{
-  struct TrackTransactionContext *tctx = cls;
-  enum GNUNET_DB_QueryStatus qs;
-
-  tctx->wdh = NULL;
-  if (MHD_HTTP_OK != hr->http_status)
-  {
-    GNUNET_break_op (0);
-    resume_track_transaction_with_response (
-      tctx,
-      MHD_HTTP_FAILED_DEPENDENCY,
-      TALER_MHD_make_json_pack (
-        "{s:I, s:I, s:I, s:O}",
-        "code",
-        (json_int_t) TALER_EC_TRACK_TRANSACTION_WIRE_TRANSFER_TRACE_ERROR,
-        "exchange_http_status",
-        (json_int_t) hr->http_status,
-        "exchange_code",
-        (json_int_t) hr->ec,
-        "exchange_reply",
-        hr->reply));
-    return;
-  }
-  for (unsigned int i = 0; i<MAX_RETRIES; i++)
-  {
-    db->preflight (db->cls);
-    qs = db->store_transfer_to_proof (db->cls,
-                                      tctx->current_exchange,
-                                      &tctx->current_wtid,
-                                      tctx->current_execution_time,
-                                      exchange_pub,
-                                      hr->reply);
-    if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
-      break;
-  }
-  if (0 > qs)
-  {
-    /* Not good, but not fatal either, log error and continue */
-    /* Special report if retries insufficient */
-    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
-    /* Always report on hard error as well to enable diagnostics */
-    GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
-    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
-                "Failed to store transfer-to-proof mapping in DB\n");
-  }
-  for (struct TrackCoinContext *tcc = tctx->tcc_head;
-       NULL != tcc;
-       tcc = tcc->next)
-  {
-    if (GNUNET_YES == tcc->have_wtid)
-      continue;
-    for (unsigned int d = 0; d<details_length; d++)
-    {
-      if (0 == GNUNET_memcmp (&details[d].coin_pub,
-                              &tcc->coin_pub))
-      {
-        tcc->wtid = tctx->current_wtid;
-        tcc->execution_time = tctx->current_execution_time;
-        tcc->have_wtid = GNUNET_YES;
-      }
-
-      for (unsigned int i = 0; i<MAX_RETRIES; i++)
-      {
-        db->preflight (db->cls);
-        qs = db->store_coin_to_transfer (db->cls,
-                                         &details[d].h_contract_terms,
-                                         &details[d].coin_pub,
-                                         &tctx->current_wtid);
-        if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
-          break;
-      }
-      if (0 > qs)
-      {
-        /* Not good, but not fatal either, log error and continue */
-        /* Special report if retries insufficient */
-        GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
-        /* Always report on hard error as well to enable diagnostics */
-        GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
-        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);
-}
-
-
-/**
- * Closure for #proof_cb().
- */
-struct ProofCheckContext
-{
-  /**
-   * Proof returned from #proof_cb.  The reference counter was
-   * increased for this reference and it must thus be freed.
-   * NULL if we did not find any proof.  The JSON should
-   * match the `TrackTransferResponse` of the exchange API
-   * (https://api.taler.net/api-exchange.html#tracktransferresponse)
-   */
-  json_t *p_ret;
-
-};
-
-
-/**
- * Function called with information about a wire transfer identifier.
- * We actually never expect this to be called.
- *
- * @param cls closure with a `struct ProofCheckContext`
- * @param proof proof from exchange about what the wire transfer was for
- */
-static void
-proof_cb (void *cls,
-          const json_t *proof)
-{
-  struct ProofCheckContext *pcc = cls;
-
-  GNUNET_break (NULL == pcc->p_ret);
-  pcc->p_ret = json_incref ((json_t *) proof);
-}
-
-
-/**
- * This function takes the wtid from the coin being tracked
- * and _track_ it against the exchange.  This way, we know
- * all the other coins which were aggregated together with
- * this one.  This way we save further HTTP requests to track
- * the other coins.
- *
- * @param cls closure with a `struct TrackCoinContext`
- * @param hr HTTP response details
- * @param exchange_pub public key of the exchange used for signing @a json
- * @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,
-         const struct TALER_EXCHANGE_HttpResponse *hr,
-         const struct TALER_ExchangePublicKeyP *exchange_pub,
-         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;
-  struct ProofCheckContext pcc;
-  enum GNUNET_DB_QueryStatus qs;
-
-  tcc->dwh = NULL;
-  if (MHD_HTTP_OK != hr->http_status)
-  {
-    if (MHD_HTTP_ACCEPTED == hr->http_status)
-    {
-      resume_track_transaction_with_response (
-        tcc->tctx,
-        MHD_HTTP_ACCEPTED,
-        /* Return verbatim what the exchange said.  */
-        TALER_MHD_make_json (hr->reply));
-      return;
-    }
-
-    /* Transaction not resolved for one of the
-       coins, report error! */
-    resume_track_transaction_with_response (
-      tcc->tctx,
-      MHD_HTTP_FAILED_DEPENDENCY,
-      TALER_MHD_make_json_pack (
-        "{s:I, s:I, s:I, s:O}",
-        "code",
-        (json_int_t) TALER_EC_TRACK_TRANSACTION_COIN_TRACE_ERROR,
-        "exchange_http_status",
-        (json_int_t) hr->http_status,
-        "exchange_code",
-        (json_int_t) hr->ec,
-        "exchange_reply",
-        hr->reply));
-    return;
-  }
-  tctx->current_wtid = *wtid;
-  tctx->current_execution_time = execution_time;
-
-  pcc.p_ret = NULL;
-  /* attempt to find this wtid's track from our database,
-     Will make pcc.p_ret point to a "proof", if one exists. */
-  db->preflight (db->cls);
-  qs = db->find_proof_by_wtid (db->cls,
-                               tctx->current_exchange,
-                               wtid,
-                               &proof_cb,
-                               &pcc);
-  if (0 > qs)
-  {
-    /* Simple select queries should not
-       cause serialization issues */
-    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
-    /* Always report on hard error as well to enable diagnostics */
-    GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
-    resume_track_transaction_with_response (
-      tcc->tctx,
-      MHD_HTTP_INTERNAL_SERVER_ERROR,
-      TALER_MHD_make_error (
-        TALER_EC_TRACK_TRANSACTION_DB_FETCH_TRANSACTION_ERROR,
-        "Fail to query database about proofs"));
-    return;
-  }
-
-  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
-  {
-    /* How come this wtid was already stored into the
-       database and _not all_ of its coins were already
-       tracked? Inconsistent state (! At least regarding
-       what the exchange tells us) */
-    GNUNET_break_op (0);
-    resume_track_transaction_with_response (
-      tcc->tctx,
-      MHD_HTTP_FAILED_DEPENDENCY,
-      TALER_MHD_make_json_pack (
-        "{s:I, s:s, s:O, s:o, s:o}",
-        "code", (json_int_t) TALER_EC_TRACK_TRANSACTION_CONFLICTING_REPORTS,
-        "hint", "conflicting transfer data from exchange",
-        "transaction_tracking_claim", hr->reply,
-        "wtid_tracking_claim", pcc.p_ret,
-        "coin_pub", GNUNET_JSON_from_data_auto (&tcc->coin_pub)));
-    return;
-  }
-
-  tctx->wdh = TALER_EXCHANGE_transfers_get (tctx->eh,
-                                            wtid,
-                                            &wire_deposits_cb,
-                                            tctx);
-}
-
-
-/**
- * We have obtained all WTIDs, now prepare the response
- *
- * @param tctx handle for the operation
- */
-static void
-generate_response (struct TrackTransactionContext *tctx)
-{
-  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 (struct TrackCoinContext *tcc = tctx->tcc_head;
-       NULL != tcc;
-       tcc = tcc->next)
-  {
-    int found = GNUNET_NO;
-
-    for (struct TrackCoinContext *tcc2 = tctx->tcc_head;
-         tcc2 != tcc;
-         tcc2 = tcc2->next)
-    {
-      if (0 == GNUNET_memcmp (&tcc->wtid,
-                              &tcc2->wtid))
-      {
-        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 TransactionWireTransfer wts[num_wtid];
-    unsigned int wtid_off;
-
-    wtid_off = 0;
-    for (struct TrackCoinContext *tcc = tctx->tcc_head;
-         NULL != tcc;
-         tcc = tcc->next)
-    {
-      int found = GNUNET_NO;
-
-      for (struct TrackCoinContext *tcc2 = tctx->tcc_head;
-           tcc2 != tcc;
-           tcc2 = tcc2->next)
-      {
-        if (0 == GNUNET_memcmp (&tcc->wtid,
-                                &tcc2->wtid))
-        {
-          found = GNUNET_YES;
-          break;
-        }
-      }
-      if (GNUNET_NO == found)
-      {
-        unsigned int num_coins;
-        struct TransactionWireTransfer *wt;
-
-        wt = &wts[wtid_off++];
-        wt->wtid = tcc->wtid;
-        wt->exchange_url = tcc->exchange_url;
-        wt->execution_time = tcc->execution_time;
-        /* count number of coins with this wtid */
-        num_coins = 0;
-        for (struct TrackCoinContext *tcc2 = tctx->tcc_head;
-             NULL != tcc2;
-             tcc2 = tcc2->next)
-        {
-          if (0 == GNUNET_memcmp (&wt->wtid,
-                                  &tcc2->wtid))
-            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 (struct TrackCoinContext *tcc2 = tctx->tcc_head;
-             NULL != tcc2;
-             tcc2 = tcc2->next)
-        {
-          if (0 == GNUNET_memcmp (&wt->wtid,
-                                  &tcc2->wtid))
-          {
-            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);
-
-    {
-      struct MHD_Response *resp;
-
-      resp = 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' */
-}
-
-
-/**
- * Find the exchange to trace the next coin(s).
- *
- * @param tctx operation context
- */
-static void
-find_exchange (struct TrackTransactionContext *tctx);
-
-
-/**
- * This function is called to 'trace the wire transfers'
- * (true?) 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;
-
-  /* Make sure we are connected to the exchange. */
-  GNUNET_assert (NULL != tctx->eh);
-
-  for (tcc = tctx->tcc_head; NULL != tcc; tcc = tcc->next)
-
-    /* How come one doesn't have wtid? */
-    if (GNUNET_YES != tcc->have_wtid)
-      break;
-
-  if (NULL != tcc)
-  {
-    if (0 != strcmp (tcc->exchange_url,
-                     tctx->current_exchange))
-    {
-      /* exchange changed, find matching one first! */
-      tctx->eh = NULL;
-      tctx->current_exchange = NULL;
-      find_exchange (tctx);
-      return;
-    }
-    /* we are not done requesting WTIDs from the current
-       exchange; do the next one */
-    tcc->dwh = TALER_EXCHANGE_deposits_get (tctx->eh,
-                                            &tctx->mi->privkey,
-                                            &tctx->h_wire,
-                                            &tctx->h_contract_terms,
-                                            &tcc->coin_pub,
-                                            &wtid_cb,
-                                            tcc);
-    return;
-  }
-  tctx->current_exchange = NULL;
-  tctx->eh = NULL;
-  generate_response (tctx);
-}
-
-
-/**
- * Function called with the result of our exchange lookup.
- * Merely provide the execution context to the routine actually
- * tracking the coin.
- *
- * @param cls the `struct TrackTransactionContext`
- * @param hr HTTP response details
- * @param eh NULL if exchange was not found to be acceptable
- * @param wire_fee NULL (we did not specify a wire method)
- * @param exchange_trusted #GNUNET_YES if this exchange is trusted by config
- */
-static void
-process_track_transaction_with_exchange (void *cls,
-                                         const struct
-                                         TALER_EXCHANGE_HttpResponse *hr,
-                                         struct TALER_EXCHANGE_Handle *eh,
-                                         const struct TALER_Amount *wire_fee,
-                                         int exchange_trusted)
-{
-  struct TrackTransactionContext *tctx = cls;
-
-  tctx->fo = NULL;
-  if (MHD_HTTP_OK != hr->http_status)
-  {
-    /* The request failed somehow */
-    GNUNET_break_op (0);
-    resume_track_transaction_with_response (
-      tctx,
-      MHD_HTTP_FAILED_DEPENDENCY,
-      TALER_MHD_make_json_pack (
-        (NULL != hr->reply)
-        ? "{s:s, s:I, s:I, s:I, s:O}"
-        : "{s:s, s:I, s:I, s:I}",
-        "hint", "failed to obtain meta-data from exchange",
-        "code", (json_int_t) TALER_EC_TRACK_TRANSACTION_EXCHANGE_KEYS_FAILURE,
-        "exchange_http_status", (json_int_t) hr->http_status,
-        "exchange_code", (json_int_t) hr->ec,
-        "exchange_reply", hr->reply));
-    return;
-  }
-  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,
-                                          TALER_MHD_make_error (
-                                            TALER_EC_PAY_EXCHANGE_TIMEOUT,
-                                            "exchange not reachable"));
-}
-
-
-/**
- * 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,
-             const struct GNUNET_HashCode *h_contract_terms,
-             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;
-
-  if (0 != GNUNET_memcmp (coin_pub,
-                          &tcc->coin_pub))
-    return;
-  tcc->wtid = *wtid;
-  tcc->execution_time = execution_time;
-  tcc->have_wtid = GNUNET_YES;
-}
-
-
-/**
- * Responsible to get the current coin wtid and store it into its state.
- *
- * @param cls closure
- * @param transaction_id of the contract
- * @param coin_pub public key of the coin
- * @param exchange_url URL of exchange that issued @a coin_pub
- * @param amount_with_fee amount the exchange will deposit for this coin
- * @param deposit_fee fee the exchange will charge for this coin
- * @param refund_fee fee the exchange will charge for refunding this coin
- * @param exchange_proof proof from exchange that coin was accepted
- */
-static void
-coin_cb (void *cls,
-         const struct GNUNET_HashCode *h_contract_terms,
-         const struct TALER_CoinSpendPublicKeyP *coin_pub,
-         const char *exchange_url,
-         const struct TALER_Amount *amount_with_fee,
-         const struct TALER_Amount *deposit_fee,
-         const struct TALER_Amount *refund_fee,
-         const struct TALER_Amount *wire_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->exchange_url = GNUNET_strdup (exchange_url);
-  tcc->amount_with_fee = *amount_with_fee;
-  tcc->deposit_fee = *deposit_fee;
-  GNUNET_CONTAINER_DLL_insert (tctx->tcc_head,
-                               tctx->tcc_tail,
-                               tcc);
-
-  /* find all those <coin, wtid> pairs associated to
-     this contract term's hash code.  The callback
-     will then set the wtid for the "current coin"
-     context. */
-  {
-    enum GNUNET_DB_QueryStatus qs;
-
-    qs = db->find_transfers_by_hash (db->cls,
-                                     h_contract_terms,
-                                     &transfer_cb,
-                                     tcc);
-    if (0 > qs)
-    {
-      GNUNET_break (0);
-      tctx->qs = qs;
-    }
-  }
-}
-
-
-/**
- * Find the exchange to trace the next coin(s).
- *
- * @param tctx operation context
- */
-static void
-find_exchange (struct TrackTransactionContext *tctx)
-{
-  struct TrackCoinContext *tcc = tctx->tcc_head;
-
-  while ( (NULL != tcc) &&
-          (GNUNET_YES == tcc->have_wtid) )
-    tcc = tcc->next;
-  if (NULL != tcc)
-  {
-    tctx->current_exchange = tcc->exchange_url;
-    tctx->fo = TMH_EXCHANGES_find_exchange (
-      tctx->current_exchange,
-      NULL,
-      GNUNET_NO,
-      &process_track_transaction_with_exchange,
-      tctx);
-
-  }
-  else
-  {
-    generate_response (tctx);
-  }
-}
-
-
-/**
- * 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
- * @param mi merchant backend instance, never NULL
- * @return MHD result code
- */
-MHD_RESULT
-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 MerchantInstance *mi)
-{
-  struct TrackTransactionContext *tctx;
-  const char *order_id;
-  enum GNUNET_DB_QueryStatus qs;
-  struct json_t *contract_terms;
-
-  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)
-  {
-    MHD_RESULT ret;
-
-    /* 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 */
-  }
-  order_id = MHD_lookup_connection_value (connection,
-                                          MHD_GET_ARGUMENT_KIND,
-                                          "order_id");
-  if (NULL == order_id)
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_BAD_REQUEST,
-                                       TALER_EC_PARAMETER_MISSING,
-                                       "order_id");
-
-  tctx->mi = mi;
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "Tracking on behalf of instance '%s'\n",
-              mi->id);
-
-
-  /* Map order id to contract terms; the objective is to get
-     the contract term's hashcode so as to retrieve all the
-     coins which have been deposited for it. */
-  db->preflight (db->cls);
-  qs = db->find_contract_terms (db->cls,
-                                &contract_terms,
-                                order_id,
-                                &tctx->mi->pubkey);
-  if (0 > qs)
-  {
-    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                       TALER_EC_TRACK_TRANSACTION_DB_FETCH_TRANSACTION_ERROR,
-                                       "Database error finding contract terms");
-  }
-  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_NOT_FOUND,
-                                       TALER_EC_PROPOSAL_LOOKUP_NOT_FOUND,
-                                       "Given order_id doesn't map to any proposal");
-
-  if (GNUNET_OK !=
-      TALER_JSON_contract_hash (contract_terms,
-                                &tctx->h_contract_terms))
-  {
-    json_decref (contract_terms);
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                       TALER_EC_INTERNAL_LOGIC_ERROR,
-                                       "Failed to hash contract terms");
-  }
-
-  {
-    struct GNUNET_JSON_Specification spec[] = {
-      TALER_JSON_spec_absolute_time ("refund_deadline",
-                                     &tctx->refund_deadline),
-      TALER_JSON_spec_absolute_time ("timestamp",
-                                     &tctx->timestamp),
-      TALER_JSON_spec_amount ("amount",
-                              &tctx->total_amount),
-      GNUNET_JSON_spec_fixed_auto ("h_wire",
-                                   &tctx->h_wire),
-      GNUNET_JSON_spec_end ()
-    };
-
-    if (GNUNET_YES !=
-        GNUNET_JSON_parse (contract_terms,
-                           spec,
-                           NULL, NULL))
-    {
-      GNUNET_break (0);
-      GNUNET_JSON_parse_free (spec);
-      json_decref (contract_terms);
-      return TALER_MHD_reply_with_error (connection,
-                                         MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                         TALER_EC_INTERNAL_LOGIC_ERROR,
-                                         "Failed to parse contract terms from DB");
-    }
-    json_decref (contract_terms);
-  }
-
-  tctx->qs = GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
-  db->preflight (db->cls);
-
-  /* Find coins which have been deposited for this contract,
-     and retrieve the wtid for each one. */
-  qs = db->find_payments (db->cls,
-                          &tctx->h_contract_terms,
-                          &tctx->mi->pubkey,
-                          &coin_cb,
-                          tctx);
-  if ( (0 > qs) ||
-       (0 > tctx->qs) )
-  {
-    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
-    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != tctx->qs);
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_INTERNAL_SERVER_ERROR,
-                                       TALER_EC_TRACK_TRANSACTION_DB_FETCH_PAYMENT_ERROR,
-                                       "Database error: failed to find payment data");
-  }
-  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
-  {
-    return TALER_MHD_reply_with_error (connection,
-                                       MHD_HTTP_NOT_FOUND,
-                                       TALER_EC_TRACK_TRANSACTION_DB_NO_DEPOSITS_ERROR,
-                                       "deposit data not found");
-  }
-  *connection_cls = tctx;
-
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "Suspending /track/transaction handling while working with the exchange\n");
-  MHD_suspend_connection (connection);
-  tctx->timeout_task
-    = GNUNET_SCHEDULER_add_delayed (TRACK_TIMEOUT,
-                                    &handle_track_transaction_timeout,
-                                    tctx);
-  find_exchange (tctx);
-  return MHD_YES;
-}
-
-
-/* end of taler-merchant-httpd_track-transaction.c */
diff --git a/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.h b/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.h
deleted file mode 100644
index 02b9a7b5..00000000
--- a/src/backend/taler-merchant-httpd_private-post-orders-ID-track-UNSPEC.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
-  This file is part of TALER
-  (C) 2014-2020 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_track-transaction.h
- * @brief headers for /track/transaction handler
- * @author Christian Grothoff
- * @author Marcello Stanisci
- */
-#ifndef TALER_MERCHANT_HTTPD_TRACK_TRANSACTION_H
-#define TALER_MERCHANT_HTTPD_TRACK_TRANSACTION_H
-#include <microhttpd.h>
-#include "taler-merchant-httpd.h"
-
-/**
- * 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
- * @param mi merchant backend instance, never NULL
- * @return MHD result code
- */
-MHD_RESULT
-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 MerchantInstance *mi);
-
-
-#endif