summaryrefslogtreecommitdiff
path: root/src/lib/test_merchant_api.c
blob: fe596ebd00dc73f0c25dd2fc952b130bb9b9661e (plain)
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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 merchant/test_merchant_api.c
 * @brief testcase to test merchant's HTTP API interface
 * @author Christian Grothoff
 * @author Marcello Stanisci
 */
#include "platform.h"
#include <taler/taler_exchange_service.h>
#include <taler/taler_fakebank_lib.h>
#include <taler/taler_json_lib.h>
#include <taler/taler_util.h>
#include <taler/taler_signatures.h>
#include "taler_merchant_service.h"
#include "taler_merchantdb_lib.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_curl_lib.h>
#include <microhttpd.h>

/**
 * URI under which the merchant is reachable during the testcase.
 */
#define MERCHANT_URI "http://localhost:8082"

/**
 * URI under which the exchange is reachable during the testcase.
 */
#define EXCHANGE_URI "http://localhost:8081/"

/**
 * URI of the bank.
 */
#define BANK_URI "http://localhost:8083/"

/**
 * On which port do we run the (fake) bank?
 */
#define BANK_PORT 8083

/**
 * Max size allowed for an order.
 */
#define ORDER_MAX_SIZE 1000

#define RND_BLK(ptr)                                                    \
  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK, ptr, sizeof (*ptr))


/**
 * Handle to database.
 */
struct TALER_MERCHANTDB_Plugin *db;

/**
 * Configuration handle.
 */
struct GNUNET_CONFIGURATION_Handle *cfg;

/**
 * Handle to access the exchange.
 */
static struct TALER_EXCHANGE_Handle *exchange;

/**
 * Main execution context for the main loop of the exchange.
 */
static struct GNUNET_CURL_Context *ctx;

/**
 * Array of instances to test against
 */
static char **instances;

/**
 * How many merchant instances this test runs
 */
unsigned int ninstances = 0;

/**
 * Current instance
 */
static char *instance;

/**
 * Current instance being tested
 */
unsigned int instance_idx = 0;

/**
 * Task run on timeout.
 */
static struct GNUNET_SCHEDULER_Task *timeout_task;

/**
 * Context for running the #ctx's event loop.
 */
static struct GNUNET_CURL_RescheduleContext *rc;

/**
 * Handle to the fake bank service we run for the
 * aggregator.
 */
static struct TALER_FAKEBANK_Handle *fakebank;

/**
 * Result of the testcases, #GNUNET_OK on success
 */
static int result;


/**
 * Opcodes for the interpreter.
 */
enum OpCode
{
  /**
   * Termination code, stops the interpreter loop (with success).
   */
  OC_END = 0,

  /**
   * Issue a GET /proposal to the backend.
   */
  OC_PROPOSAL_LOOKUP,

  /**
   * Add funds to a reserve by (faking) incoming wire transfer.
   */
  OC_ADMIN_ADD_INCOMING,

  /**
   * Check status of a reserve.
   */
  OC_WITHDRAW_STATUS,

  /**
   * Withdraw a coin from a reserve.
   */
  OC_WITHDRAW_SIGN,

  /**
   * Issue a PUT /proposal to the backend.
   */
  OC_PROPOSAL,

  /**
   * Pay with coins.
   */
  OC_PAY,

  /**
   * Run the aggregator to execute deposits.
   */
  OC_RUN_AGGREGATOR,

  /**
   * Check that the fakebank has received a certain transaction.
   */
  OC_CHECK_BANK_TRANSFER,

  /**
   * Check that the fakebank has not received any other transactions.
   */
  OC_CHECK_BANK_TRANSFERS_EMPTY,

  /**
   * Retrieve deposit details for a given wire transfer
   */
  OC_TRACK_TRANSFER,

  /**
   * Retrieve wire transfer details for a given transaction
   */
  OC_TRACK_TRANSACTION,

  /**
   * Test getting transactions based on timestamp
   */
  OC_HISTORY

};


/**
 * Structure specifying details about a coin to be melted.
 * Used in a NULL-terminated array as part of command
 * specification.
 */
struct MeltDetails
{

  /**
   * Amount to melt (including fee).
   */
  const char *amount;

  /**
   * Reference to reserve_withdraw operations for coin to
   * be used for the /refresh/melt operation.
   */
  const char *coin_ref;

};


/**
 * Information about a fresh coin generated by the refresh operation.
 */
struct FreshCoin
{

  /**
   * If @e amount is NULL, this specifies the denomination key to
   * use.  Otherwise, this will be set (by the interpreter) to the
   * denomination PK matching @e amount.
   */
  const struct TALER_EXCHANGE_DenomPublicKey *pk;

  /**
   * Set (by the interpreter) to the exchange's signature over the
   * coin's public key.
   */
  struct TALER_DenominationSignature sig;

  /**
   * Set (by the interpreter) to the coin's private key.
   */
  struct TALER_CoinSpendPrivateKeyP coin_priv;

};


/**
 * Details for a exchange operation to execute.
 */
struct Command
{
  /**
   * Opcode of the command.
   */
  enum OpCode oc;

  /**
   * Label for the command, can be NULL.
   */
  const char *label;

  /**
   * Which response code do we expect for this command?
   */
  unsigned int expected_response_code;

  /**
   * Details about the command.
   */
  union
  {

    /**
     * Information for a #OC_ADMIN_ADD_INCOMING command.
     */
    struct
    {

      /**
       * Label to another admin_add_incoming command if we
       * should deposit into an existing reserve, NULL if
       * a fresh reserve should be created.
       */
      const char *reserve_reference;

      /**
       * String describing the amount to add to the reserve.
       */
      const char *amount;

      /**
       * Sender's bank account details (JSON).
       */
      const char *sender_details;

      /**
       * Transfer details (JSON)
       */
       const char *transfer_details;

      /**
       * Set (by the interpreter) to the reserve's private key
       * we used to fill the reserve.
       */
      struct TALER_ReservePrivateKeyP reserve_priv;

      /**
       * Set to the API's handle during the operation.
       */
      struct TALER_EXCHANGE_AdminAddIncomingHandle *aih;

    } admin_add_incoming;

    /**
     * Information for OC_PROPOSAL_LOOKUP command.
     */
    struct
    {

      /**
       * Reference to the proposal we want to lookup.
       */
      const char *proposal_reference;

      struct TALER_MERCHANT_ProposalLookupOperation *plo;

    } proposal_lookup;

    /**
     * Information for a #OC_WITHDRAW_STATUS command.
     */
    struct
    {

      /**
       * Label to the #OC_ADMIN_ADD_INCOMING command which
       * created the reserve.
       */
      const char *reserve_reference;

      /**
       * Set to the API's handle during the operation.
       */
      struct TALER_EXCHANGE_ReserveStatusHandle *wsh;

      /**
       * Expected reserve balance.
       */
      const char *expected_balance;

    } reserve_status;

    /**
     * Information for a #OC_WITHDRAW_SIGN command.
     */
    struct
    {

      /**
       * Which reserve should we withdraw from?
       */
      const char *reserve_reference;

      /**
       * String describing the denomination value we should withdraw.
       * A corresponding denomination key must exist in the exchange's
       * offerings.  Can be NULL if @e pk is set instead.
       */
      const char *amount;

      /**
       * If @e amount is NULL, this specifies the denomination key to
       * use.  Otherwise, this will be set (by the interpreter) to the
       * denomination PK matching @e amount.
       */
      const struct TALER_EXCHANGE_DenomPublicKey *pk;

      /**
       * Set (by the interpreter) to the exchange's signature over the
       * coin's public key.
       */
      struct TALER_DenominationSignature sig;

      /**
       * Set (by the interpreter) to the coin's private key.
       */
      struct TALER_CoinSpendPrivateKeyP coin_priv;

      /**
       * Blinding key used for the operation.
       */
      struct TALER_DenominationBlindingKeyP blinding_key;

      /**
       * Withdraw handle (while operation is running).
       */
      struct TALER_EXCHANGE_ReserveWithdrawHandle *wsh;

    } reserve_withdraw;

    /**
     * Information for an #OC_PROPOSAL command.
     */
    struct
    {

      /**
       * The order.
       * It's dynamically generated because we need different transaction_id
       * for different merchant instances.
       */
      char order[ORDER_MAX_SIZE];

      /**
       * Handle to the active PUT /proposal operation, or NULL.
       */
      struct TALER_MERCHANT_ProposalOperation *po;

      /**
       * Full contract in JSON, set by the /contract operation.
       * FIXME: verify in the code that this bit is actually proposal
       * data and not the whole proposal.
       */
      json_t *proposal_data;

      /**
       * Proposal's signature.
       */
      struct TALER_MerchantSignatureP merchant_sig;

      /**
       * Proposal data's hashcode.
       */
      struct GNUNET_HashCode hash;

    } proposal;

    /**
     * Information for a #OC_PAY command.
     * FIXME: support tests where we pay with multiple coins at once.
     */
    struct
    {

      /**
       * Reference to the contract.
       */
      const char *contract_ref;

      /**
       * Reference to a reserve_withdraw operation for a coin to
       * be used for the /deposit operation.
       */
      const char *coin_ref;

      /**
       * If this @e coin_ref refers to an operation that generated
       * an array of coins, this value determines which coin to use.
       */
      unsigned int coin_idx;

      /**
       * Amount to pay (from the coin, including fee).
       */
      const char *amount_with_fee;

      /**
       * Amount to pay (from the coin, excluding fee).  The sum of the
       * deltas between all @e amount_with_fee and the @e
       * amount_without_fee must be less than max_fee, and the sum of
       * the @e amount_with_fee must be larger than the @e
       * total_amount.
       */
      const char *amount_without_fee;

      /**
       * Deposit handle while operation is running.
       */
      struct TALER_MERCHANT_Pay *ph;

      /**
       * Hashcode of the proposal data associated to this payment.
       */
      struct GNUNET_HashCode h_proposal_data;

      /**
       * Merchant's public key
       */
      struct TALER_MerchantPublicKeyP merchant_pub;

    } pay;

    struct {

      /**
       * Process for the aggregator.
       */
      struct GNUNET_OS_Process *aggregator_proc;

      /**
       * ID of task called whenever we get a SIGCHILD.
       */
      struct GNUNET_SCHEDULER_Task *child_death_task;

    } run_aggregator;

    struct {

      /**
       * Which amount do we expect to see transferred?
       */
      const char *amount;

      /**
       * Which account do we expect to be debited?
       */
      uint64_t account_debit;

      /**
       * Which account do we expect to be credited?
       */
      uint64_t account_credit;

      /**
       * Set (!) to the wire transfer identifier observed.
       */
      struct TALER_WireTransferIdentifierRawP wtid;

    } check_bank_transfer;

    struct {

      /**
       * #OC_CHECK_BANK_TRANSFER command from which we should grab
       * the WTID.
       */
      char *check_bank_ref;

      /**
       * #OC_PAY command which we expect in the result.
       * Since we are tracking a bank transaction, we want to know
       * which (Taler) deposit is associated with the bank
       * transaction being tracked now.
       */
      char *expected_pay_ref;

      /**
       * Handle to a /track/transfer operation
       */
      struct TALER_MERCHANT_TrackTransferHandle *tdo;

    } track_transfer;

    struct {

      /**
       * #OC_PAY command from which we should grab
       * the WTID.
       */
      char *pay_ref;

      /**
       * #OC_CHECK_BANK_TRANSFER command which we expect in the result.
       */
      char *expected_transfer_ref;

      /**
       * Handle to a /track/transaction operation
       */
      struct TALER_MERCHANT_TrackTransactionHandle *tth;

    } track_transaction;

    struct {
      /**
       * Date we want retrieved transactions younger than
       */
      struct GNUNET_TIME_Absolute date;

      /**
       * How many "rows" we expect in the result
       */
      unsigned int nresult;

      /**
       * Handle to the merchant
       */

      /**
       * Handle to /history request
       */
      struct TALER_MERCHANT_HistoryOperation *ho;

    } history;



  } details;

};


/**
 * State of the interpreter loop.
 */
struct InterpreterState
{
  /**
   * Keys from the exchange.
   */
  const struct TALER_EXCHANGE_Keys *keys;

  /**
   * Commands the interpreter will run.
   */
  struct Command *commands;

  /**
   * Interpreter task (if one is scheduled).
   */
  struct GNUNET_SCHEDULER_Task *task;

  /**
   * Instruction pointer.  Tells #interpreter_run() which
   * instruction to run next.
   */
  unsigned int ip;

};


/**
 * Pipe used to communicate child death via signal.
 */
static struct GNUNET_DISK_PipeHandle *sigpipe;


/**
 * The testcase failed, return with an error code.
 *
 * @param is interpreter state to clean up
 */
static void
fail (struct InterpreterState *is)
{
  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
              "Interpreter failed at step %s (#%u)\n",
              is->commands[is->ip].label,
              is->ip);
  result = GNUNET_SYSERR;
  GNUNET_SCHEDULER_shutdown ();
}


/**
 * Find a command by label.
 *
 * @param is interpreter state to search
 * @param label label to look for
 * @return NULL if command was not found
 */
static const struct Command *
find_command (const struct InterpreterState *is,
              const char *label)
{
  unsigned int i;
  const struct Command *cmd;

  if (NULL == label)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Attempt to lookup command for empty label\n");
    return NULL;
  }
  for (i=0;OC_END != (cmd = &is->commands[i])->oc;i++)
    if ( (NULL != cmd->label) &&
         (0 == strcmp (cmd->label,
                       label)) )
      return cmd;
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "Command not found: %s\n",
              label);
  return NULL;
}


/**
 * Run the main interpreter loop that performs exchange operations.
 *
 * @param cls contains the `struct InterpreterState`
 */
static void
interpreter_run (void *cls);


/**
 * Run the next command with the interpreter.
 *
 * @param is current interpeter state.
 */
static void
next_command (struct InterpreterState *is)
{
  is->ip++;
  is->task = GNUNET_SCHEDULER_add_now (&interpreter_run,
                                       is);
}


/**
 * Function called upon completion of our /admin/add/incoming request.
 *
 * @param cls closure with the interpreter state
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
 *                    0 if the exchange's reply is bogus (fails to follow the protocol)
 * @param ec taler-specific error code, #TALER_EC_NONE on success
 * @param full_response full response from the exchange (for logging, in case of errors)
 */
static void
add_incoming_cb (void *cls,
                 unsigned int http_status,
		 enum TALER_ErrorCode ec,
                 const json_t *full_response)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];

  cmd->details.admin_add_incoming.aih = NULL;
  if (MHD_HTTP_OK != http_status)
  {
    GNUNET_break (0);
    fail (is);
    return;
  }
  next_command (is);
}


/**
 * Callback for a /history request. It's up to this function how
 * to render the array containing transactions details (FIXME link to
 * documentation)
 *
 * @param cls closure
 * @param http_status HTTP status returned by the merchant backend
 * @param ec taler-specific error code
 * @param json actual body containing history
 */
static void
history_cb (void *cls,
            unsigned int http_status,
	    enum TALER_ErrorCode ec,
            const json_t *json)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  unsigned int nresult;

  if (MHD_HTTP_OK != http_status)
  {
    fail (is);
    return;
  }
  nresult = json_array_size (json);
  if (nresult != cmd->details.history.nresult)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected number of history entries. Got %d, expected %d\n",
                nresult,
                cmd->details.history.nresult);
    fail (is);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "/history data: %s\n",
              json_dumps (json, JSON_INDENT (1)));

  next_command (is);
}

/**
 * Check if the given historic event @a h corresponds to the given
 * command @a cmd.
 *
 * @param h event in history
 * @param cmd an #OC_ADMIN_ADD_INCOMING command
 * @return #GNUNET_OK if they match, #GNUNET_SYSERR if not
 */
static int
compare_admin_add_incoming_history (const struct TALER_EXCHANGE_ReserveHistory *h,
                                    const struct Command *cmd)
{
  struct TALER_Amount amount;

  if (TALER_EXCHANGE_RTT_DEPOSIT != h->type)
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  GNUNET_assert (GNUNET_OK ==
                 TALER_string_to_amount (cmd->details.admin_add_incoming.amount,
                                         &amount));
  if (0 != TALER_amount_cmp (&amount,
                             &h->amount))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}


/**
 * Check if the given historic event @a h corresponds to the given
 * command @a cmd.
 *
 * @param h event in history
 * @param cmd an #OC_WITHDRAW_SIGN command
 * @return #GNUNET_OK if they match, #GNUNET_SYSERR if not
 */
static int
compare_reserve_withdraw_history (const struct TALER_EXCHANGE_ReserveHistory *h,
                                  const struct Command *cmd)
{
  struct TALER_Amount amount;
  struct TALER_Amount amount_with_fee;

  if (TALER_EXCHANGE_RTT_WITHDRAWAL != h->type)
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  GNUNET_assert (GNUNET_OK ==
                 TALER_string_to_amount (cmd->details.reserve_withdraw.amount,
                                         &amount));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_add (&amount_with_fee,
                                   &amount,
                                   &cmd->details.reserve_withdraw.pk->fee_withdraw));
  if (0 != TALER_amount_cmp (&amount_with_fee,
                             &h->amount))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}


/**
 * Function called with the result of a /reserve/status request.
 *
 * @param cls closure with the interpreter state
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
 *                    0 if the exchange's reply is bogus (fails to follow the protocol)
 * @param[in] json original response in JSON format (useful only for diagnostics)
 * @param balance current balance in the reserve, NULL on error
 * @param history_length number of entries in the transaction history, 0 on error
 * @param history detailed transaction history, NULL on error
 */
static void
reserve_status_cb (void *cls,
                   unsigned int http_status,
		   enum TALER_ErrorCode ec,
                   const json_t *json,
                   const struct TALER_Amount *balance,
                   unsigned int history_length,
                   const struct TALER_EXCHANGE_ReserveHistory *history)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  struct Command *rel;
  unsigned int i;
  unsigned int j;
  struct TALER_Amount amount;

  cmd->details.reserve_status.wsh = NULL;
  if (cmd->expected_response_code != http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u to command %s\n",
                http_status,
                cmd->label);
    GNUNET_break (0);
    json_dumpf (json, stderr, 0);
    fail (is);
    return;
  }
  switch (http_status)
  {
  case MHD_HTTP_OK:
    j = 0;
    for (i=0;i<is->ip;i++)
    {
      switch ((rel = &is->commands[i])->oc)
      {
      case OC_ADMIN_ADD_INCOMING:
        if ( ( (NULL != rel->label) &&
               (0 == strcmp (cmd->details.reserve_status.reserve_reference,
                             rel->label) ) ) ||
             ( (NULL != rel->details.admin_add_incoming.reserve_reference) &&
               (0 == strcmp (cmd->details.reserve_status.reserve_reference,
                             rel->details.admin_add_incoming.reserve_reference) ) ) )
        {
          if (GNUNET_OK !=
              compare_admin_add_incoming_history (&history[j],
                                                  rel))
          {
            GNUNET_break (0);
            fail (is);
            return;
          }
          j++;
        }
        break;
      case OC_WITHDRAW_SIGN:
        if (0 == strcmp (cmd->details.reserve_status.reserve_reference,
                         rel->details.reserve_withdraw.reserve_reference))
        {
          if (GNUNET_OK !=
              compare_reserve_withdraw_history (&history[j],
                                             rel))
          {
            GNUNET_break (0);
            fail (is);
            return;
          }
          j++;
        }
        break;
      default:
        /* unreleated, just skip */
        break;
      }
    }
    if (j != history_length)
    {
      GNUNET_break (0);
      fail (is);
      return;
    }
    if (NULL != cmd->details.reserve_status.expected_balance)
    {
      GNUNET_assert (GNUNET_OK ==
                     TALER_string_to_amount (cmd->details.reserve_status.expected_balance,
                                             &amount));
      if (0 != TALER_amount_cmp (&amount,
                                 balance))
      {
        GNUNET_break (0);
        fail (is);
        return;
      }
    }
    break;
  default:
    /* Unsupported status code (by test harness) */
    GNUNET_break (0);
    break;
  }
  next_command (is);
}


/**
 * Function called upon completion of our /reserve/withdraw request.
 *
 * @param cls closure with the interpreter state
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful status request
 *                    0 if the exchange's reply is bogus (fails to follow the protocol)
 * @param ec taler-specific error code
 * @param sig signature over the coin, NULL on error
 * @param full_response full response from the exchange (for logging, in case of errors)
 */
static void
reserve_withdraw_cb (void *cls,
                     unsigned int http_status,
		     enum TALER_ErrorCode ec,
                     const struct TALER_DenominationSignature *sig,
                     const json_t *full_response)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];

  cmd->details.reserve_withdraw.wsh = NULL;
  if (cmd->expected_response_code != http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u to command %s\n",
                http_status,
                cmd->label);
    json_dumpf (full_response, stderr, 0);
    GNUNET_break (0);
    fail (is);
    return;
  }
  switch (http_status)
  {
  case MHD_HTTP_OK:
    if (NULL == sig)
    {
      GNUNET_break (0);
      fail (is);
      return;
    }
    cmd->details.reserve_withdraw.sig.rsa_signature
      = GNUNET_CRYPTO_rsa_signature_dup (sig->rsa_signature);
    break;
  case MHD_HTTP_PAYMENT_REQUIRED:
    /* nothing to check */
    break;
  default:
    /* Unsupported status code (by test harness) */
    GNUNET_break (0);
    break;
  }
  next_command (is);
}


/**
 * Callback that works PUT /proposal's output.
 *
 * @param cls closure
 * @param http_status HTTP response code, 200 indicates success;
 *                    0 if the backend's reply is bogus (fails to follow the protocol)
 * @param ec taler-specific error code
 * @param obj the full received JSON reply, or
 *            error details if the request failed
 * @param proposal_data the order + additional information provided by the
 * backend, NULL on error.
 * @param sig merchant's signature over the contract, NULL on error
 * @param h_contract hash of the contract, NULL on error
 */
static void
proposal_cb (void *cls,
             unsigned int http_status,
	     enum TALER_ErrorCode ec,
             const json_t *obj,
             const json_t *proposal_data,
             const struct TALER_MerchantSignatureP *sig,
             const struct GNUNET_HashCode *hash)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];

  cmd->details.proposal.po = NULL;
  switch (http_status)
  {
  case MHD_HTTP_OK:
    cmd->details.proposal.proposal_data = json_incref ((json_t *) proposal_data);
    cmd->details.proposal.merchant_sig = *sig;
    cmd->details.proposal.hash = *hash;
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Hashed proposal, '%s'\n",
                GNUNET_h2s (hash));
    break;
  default:
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "unexpected status code from /proposal: %u. Step %u\n",
                http_status,
                is->ip);
    json_dumpf (obj, stderr, 0);
    GNUNET_break (0);
    fail (is);
    return;
  }
  next_command (is);
}


/**
 * Function called with the result of a /pay operation.
 *
 * @param cls closure with the interpreter state
 * @param http_status HTTP response code, #MHD_HTTP_OK (200) for successful deposit;
 *                    0 if the exchange's reply is bogus (fails to follow the protocol)
 * @param ec taler-specific error code
 * @param obj the received JSON reply, should be kept as proof (and, in case of errors,
 *            be forwarded to the customer)
 */
static void
pay_cb (void *cls,
        unsigned int http_status,
	enum TALER_ErrorCode ec,
        const json_t *obj)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  struct PaymentResponsePS mr;
  struct GNUNET_CRYPTO_EddsaSignature sig;
  struct GNUNET_HashCode h_proposal_data;
  const char *error_name;
  unsigned int error_line;

  cmd->details.pay.ph = NULL;
  if (cmd->expected_response_code != http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u to command %s\n",
                http_status,
                cmd->label);
    json_dumpf (obj, stderr, 0);
    fail (is);
    return;
  }
  if (MHD_HTTP_OK == http_status)
  {
    /* Check signature */
    struct GNUNET_JSON_Specification spec[] = {
      GNUNET_JSON_spec_fixed_auto ("sig", &sig),
      GNUNET_JSON_spec_fixed_auto ("h_proposal_data", &h_proposal_data),
      GNUNET_JSON_spec_end ()
    };
    if (GNUNET_OK !=
        GNUNET_JSON_parse (obj,
                           spec,
                           &error_name,
                           &error_line))
    {
      GNUNET_break_op (0);
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Parser failed on %s:%u\n",
                  error_name,
                  error_line);
      fail (is);
      return;
    }
    mr.purpose.purpose = htonl (TALER_SIGNATURE_MERCHANT_PAYMENT_OK);
    mr.purpose.size = htonl (sizeof (mr));
    mr.h_proposal_data = h_proposal_data;
    if (GNUNET_OK !=
        GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MERCHANT_PAYMENT_OK,
                                    &mr.purpose,
  		                    &sig,
  				    &cmd->details.pay.merchant_pub.eddsa_pub))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Merchant signature given in response to /pay invalid\n");
      fail (is);
      return;
    }

  }

  next_command (is);
}


/**
 * Task triggered whenever we receive a SIGCHLD (child
 * process died).
 *
 * @param cls closure, NULL if we need to self-restart
 */
static void
maint_child_death (void *cls)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  const struct GNUNET_DISK_FileHandle *pr;
  char c[16];

  cmd->details.run_aggregator.child_death_task = NULL;
  pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
  GNUNET_break (0 < GNUNET_DISK_file_read (pr, &c, sizeof (c)));
  GNUNET_OS_process_wait (cmd->details.run_aggregator.aggregator_proc);
  GNUNET_OS_process_destroy (cmd->details.run_aggregator.aggregator_proc);
  cmd->details.run_aggregator.aggregator_proc = NULL;
  next_command (is);
}


/**
 * Callback for a /track/transfer operation
 *
 * @param cls closure for this function
 * @param http_status HTTP response code returned by the server
 * @param ec taler-specific error code
 * @param sign_key exchange key used to sign @a json, or NULL
 * @param json original json reply (may include signatures, those have then been
 *        validated already)
 * @param h_wire hash of the wire transfer address the transfer went to, or NULL on error
 * @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
track_transfer_cb (void *cls,
                   unsigned int http_status,
		   enum TALER_ErrorCode ec,
                   const struct TALER_ExchangePublicKeyP *sign_key,
                   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 InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];

  cmd->details.track_transfer.tdo = NULL;
  if (cmd->expected_response_code != http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u to command %s\n",
                http_status,
                cmd->label);
    json_dumpf (json, stderr, 0);
    fail (is);
    return;
  }
  switch (http_status)
  {
  case MHD_HTTP_OK:
    {
      const struct Command *ref;
      unsigned int i;
      int found;

      /**
       * Retrieve the deposit operation that is supposed
       * to have been paid by the wtid used in this operation.
       * After that, check if that operation is actually mentioned
       * in the returned data.
       */
      ref = find_command (is,
                          cmd->details.track_transfer.expected_pay_ref);
      GNUNET_assert (NULL != ref);
      found = GNUNET_NO;

      /**
       * Iterating over the details makes little sense now,
       * as each payment involves exatcly one coin.
       */
      for (i=0;i<details_length;i++)
      {
        struct TALER_Amount amount_with_fee;
        struct TALER_Amount amount_without_fee;
        struct TALER_Amount deposit_fee;
        const struct Command *cref;
        const struct Command *proposal_ref;
        struct TALER_CoinSpendPublicKeyP coin_pub;

        /* Extract */
        GNUNET_assert (GNUNET_OK ==
                       TALER_string_to_amount (ref->details.pay.amount_without_fee,
                                               &amount_without_fee));
        GNUNET_assert (GNUNET_OK ==
                       TALER_string_to_amount (ref->details.pay.amount_with_fee,
                                               &amount_with_fee));
        GNUNET_assert (GNUNET_OK ==
                       TALER_amount_subtract (&deposit_fee,
                                              &amount_with_fee,
                                              &amount_without_fee));

        /* Find coin ('s public key) associated with the retrieved
           deposit. Yes, one deposit - one coin. */
	cref = find_command (is,
                             ref->details.pay.coin_ref);
        proposal_ref = find_command (is,
                                     ref->details.pay.contract_ref);
        GNUNET_assert (NULL != cref);
        GNUNET_assert (NULL != proposal_ref);
	switch (cref->oc)
	{
	case OC_WITHDRAW_SIGN:
          GNUNET_CRYPTO_eddsa_key_get_public
            (&cref->details.reserve_withdraw.coin_priv.eddsa_priv,
             &coin_pub.eddsa_pub);
	  break;
	default:
	  GNUNET_assert (0);
	}

        if ( (0 == memcmp (&details[i].h_proposal_data,
                           &proposal_ref->details.proposal.hash,
                           sizeof (struct GNUNET_HashCode))) &&
             (0 == TALER_amount_cmp (&details[i].coin_value,
                                     &amount_with_fee)) &&
             (0 == TALER_amount_cmp (&details[i].coin_fee,
                                     &deposit_fee)) &&
             (0 == memcmp (&details[i].coin_pub,
                           &coin_pub,
                           sizeof (struct TALER_CoinSpendPublicKeyP))) )
          found = GNUNET_YES;
      }
      if (GNUNET_NO == found)
      {
        GNUNET_break (0);
        json_dumpf (json, stderr, 0);
        fail (is);
        return;
      }
      break;
    }
  default:
    break;
  }
  next_command (is);
}

/**
 * Callback for GET /proposal issued at backend. Just check
 * whether response code is as expected.
 *
 * @param cls closure
 * @param http_status HTTP status code we got
 */
static void
proposal_lookup_cb (void *cls,
                    unsigned int http_status,
                    const json_t *json)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  
  cmd->details.proposal_lookup.plo = NULL;

  if (cmd->expected_response_code != http_status)
    fail (is);

  next_command (is);
}

/**
 * Function called with detailed wire transfer data.
 *
 * @param cls closure
 * @param http_status HTTP status code we got, 0 on exchange protocol violation
 * @param ec taler-specific error code
 * @param json original json reply
 * @param num_transfers number of wire transfers involved in setting the transaction
 * @param transfers detailed list of transfers involved and their coins
 */
static void
track_transaction_cb (void *cls,
                      unsigned int http_status,
		      enum TALER_ErrorCode ec,
                      const json_t *json,
                      unsigned int num_transfers,
                      const struct TALER_MERCHANT_TransactionWireTransfer *transfers)
{
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];

  cmd->details.track_transaction.tth = NULL;
  if (cmd->expected_response_code != http_status)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u to command %s\n",
                http_status,
                cmd->label);
    json_dumpf (json, stderr, 0);
    fail (is);
    return;
  }
  /* Test result vs. expecations... */
  switch (http_status)
  {
  case MHD_HTTP_OK:
    {
      const struct Command *ref;
      struct TALER_Amount ea;
      struct TALER_Amount coin_contribution;

      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Successful /track/tracking\n");
      if (1 != num_transfers)
      {
        GNUNET_break (0);
        json_dumpf (json, stderr, 0);
        fail (is);
        return;
      }
      ref = find_command (is,
                          cmd->details.track_transaction.expected_transfer_ref);
      GNUNET_assert (NULL != ref);
      if (0 != memcmp (&ref->details.check_bank_transfer.wtid,
                       &transfers[0].wtid,
                       sizeof (struct TALER_WireTransferIdentifierRawP)))
      {
        GNUNET_break (0);
        json_dumpf (json, stderr, 0);
        fail (is);
        return;
      }
      /* NOTE: this assumes that the wire transfer corresponds to a
         single coin involved in a pay/deposit.  Thus, this invariant
         may not always hold in the future depending on how the
         testcases evolve. */
      if (1 != transfers[0].num_coins)
      {
        GNUNET_break (0);
        json_dumpf (json, stderr, 0);
        fail (is);
        return;
      }
      GNUNET_assert (GNUNET_OK ==
                     TALER_string_to_amount (ref->details.check_bank_transfer.amount,
                                             &ea));
      GNUNET_assert (GNUNET_OK ==
                     TALER_amount_subtract (&coin_contribution,
                                            &transfers[0].coins[0].amount_with_fee,
                                            &transfers[0].coins[0].deposit_fee));
      if (0 !=
          TALER_amount_cmp (&ea,
                            &coin_contribution))
      {
        GNUNET_break (0);
        json_dumpf (json, stderr, 0);
        fail (is);
        return;
      }
      break;
    }
  default:
    break;
  }
  next_command (is);
}


/**
 * Find denomination key matching the given amount.
 *
 * @param keys array of keys to search
 * @param amount coin value to look for
 * @return NULL if no matching key was found
 */
static const struct TALER_EXCHANGE_DenomPublicKey *
find_pk (const struct TALER_EXCHANGE_Keys *keys,
         const struct TALER_Amount *amount)
{
  unsigned int i;
  struct GNUNET_TIME_Absolute now;
  struct TALER_EXCHANGE_DenomPublicKey *pk;
  char *str;

  now = GNUNET_TIME_absolute_get ();
  for (i=0;i<keys->num_denom_keys;i++)
  {
    pk = &keys->denom_keys[i];
    if ( (0 == TALER_amount_cmp (amount,
                                 &pk->value)) &&
         (now.abs_value_us >= pk->valid_from.abs_value_us) &&
         (now.abs_value_us < pk->withdraw_valid_until.abs_value_us) )
      return pk;
  }
  /* do 2nd pass to check if expiration times are to blame for failure */
  str = TALER_amount_to_string (amount);
  for (i=0;i<keys->num_denom_keys;i++)
  {
    pk = &keys->denom_keys[i];
    if ( (0 == TALER_amount_cmp (amount,
                                 &pk->value)) &&
         ( (now.abs_value_us < pk->valid_from.abs_value_us) ||
           (now.abs_value_us > pk->withdraw_valid_until.abs_value_us) ) )
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Have denomination key for `%s', but with wrong expiration range %llu vs [%llu,%llu)\n",
                  str,
                  (unsigned long long) now.abs_value_us,
                  (unsigned long long) pk->valid_from.abs_value_us,
                  (unsigned long long) pk->withdraw_valid_until.abs_value_us);
      GNUNET_free (str);
      return NULL;
    }
  }
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "No denomination key for amount %s found\n",
              str);
  GNUNET_free (str);
  return NULL;
}


/**
 * Run the main interpreter loop that performs exchange operations.
 *
 * @param cls contains the `struct InterpreterState`
 */
static void
interpreter_run (void *cls)
{
  const struct GNUNET_SCHEDULER_TaskContext *tc;
  struct InterpreterState *is = cls;
  struct Command *cmd = &is->commands[is->ip];
  const struct Command *ref;
  struct TALER_ReservePublicKeyP reserve_pub;
  struct TALER_CoinSpendPublicKeyP coin_pub;
  struct TALER_Amount amount;
  struct GNUNET_TIME_Absolute execution_date;
  json_t *sender_details;
  json_t *transfer_details;

  is->task = NULL;
  tc = GNUNET_SCHEDULER_get_task_context ();
  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
  {
    fprintf (stderr,
             "Test aborted by shutdown request\n");
    fail (is);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Interpreter runs command %u/%s(%u)\n",
	      is->ip,
	      cmd->label,
	      cmd->oc);
  switch (cmd->oc)
  {
    case OC_END:
      result = GNUNET_OK;
      if (instance_idx + 1 == ninstances)
      {
        GNUNET_SCHEDULER_shutdown ();
        return;
      }
      is->ip = 0;
      instance_idx++;
      instance = instances[instance_idx];
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Switching instance: '%s'\n",
                  instance);
  
      is->task = GNUNET_SCHEDULER_add_now (interpreter_run,
                                           is);
      return;

    case OC_PROPOSAL_LOOKUP:
    {
      const char *order_id;
  
      GNUNET_assert (NULL != cmd->details.proposal_lookup.proposal_reference);
      ref = find_command (is, cmd->details.proposal_lookup.proposal_reference);
      GNUNET_assert (NULL != ref);
  
      order_id =
        json_string_value (json_object_get (ref->details.proposal.proposal_data,
                                            "order_id"));
      GNUNET_assert (NULL !=
                      (cmd->details.proposal_lookup.plo
                       = TALER_MERCHANT_proposal_lookup (ctx,
                                                         MERCHANT_URI,
                                                         order_id,
                                                         instance,
                                                         proposal_lookup_cb,
                                                         is)));
    }
  
    return;

  case OC_ADMIN_ADD_INCOMING:
    if (NULL !=
        cmd->details.admin_add_incoming.reserve_reference)
    {
      ref = find_command (is,
                          cmd->details.admin_add_incoming.reserve_reference);
      GNUNET_assert (NULL != ref);
      GNUNET_assert (OC_ADMIN_ADD_INCOMING == ref->oc);
      cmd->details.admin_add_incoming.reserve_priv
        = ref->details.admin_add_incoming.reserve_priv;
    }
    else
    {
      struct GNUNET_CRYPTO_EddsaPrivateKey *priv;

      priv = GNUNET_CRYPTO_eddsa_key_create ();
      cmd->details.admin_add_incoming.reserve_priv.eddsa_priv = *priv;
      GNUNET_free (priv);
    }
    GNUNET_CRYPTO_eddsa_key_get_public (&cmd->details.admin_add_incoming.reserve_priv.eddsa_priv,
                                        &reserve_pub.eddsa_pub);
    if (GNUNET_OK !=
        TALER_string_to_amount (cmd->details.admin_add_incoming.amount,
                                &amount))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Failed to parse amount `%s' at %u\n",
                  cmd->details.admin_add_incoming.amount,
                  is->ip);
      fail (is);
      return;
    }

    execution_date = GNUNET_TIME_absolute_get ();
    GNUNET_TIME_round_abs (&execution_date);
    sender_details = json_loads (cmd->details.admin_add_incoming.sender_details,
                                 JSON_REJECT_DUPLICATES,
                                 NULL);
    if (NULL == sender_details)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Failed to parse sender details `%s' at %u\n",
                  cmd->details.admin_add_incoming.sender_details,
                  is->ip);
      fail (is);
      return;
    }
    transfer_details = json_loads (cmd->details.admin_add_incoming.transfer_details,
                                   JSON_REJECT_DUPLICATES,
                                   NULL);

    if (NULL == transfer_details)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Failed to parse transfer details `%s' at %u\n",
                  cmd->details.admin_add_incoming.transfer_details,
                  is->ip);
      fail (is);
      return;
    }

    cmd->details.admin_add_incoming.aih
      = TALER_EXCHANGE_admin_add_incoming (exchange,
                                           "http://localhost:18080/",
                                           &reserve_pub,
                                           &amount,
                                           execution_date,
                                           sender_details,
                                           transfer_details,
                                           &add_incoming_cb,
                                           is);
    json_decref (sender_details);
    json_decref (transfer_details);
    if (NULL == cmd->details.admin_add_incoming.aih)
    {
      GNUNET_break (0);
      fail (is);
      return;
    }
    return;
  case OC_WITHDRAW_STATUS:
    GNUNET_assert (NULL !=
                   cmd->details.reserve_status.reserve_reference);
    ref = find_command (is,
                        cmd->details.reserve_status.reserve_reference);
    GNUNET_assert (NULL != ref);
    GNUNET_assert (OC_ADMIN_ADD_INCOMING == ref->oc);
    GNUNET_CRYPTO_eddsa_key_get_public (&ref->details.admin_add_incoming.reserve_priv.eddsa_priv,
                                        &reserve_pub.eddsa_pub);
    cmd->details.reserve_status.wsh
      = TALER_EXCHANGE_reserve_status (exchange,
                                       &reserve_pub,
                                       &reserve_status_cb,
                                       is);
    return;
  case OC_WITHDRAW_SIGN:
    GNUNET_assert (NULL !=
                   cmd->details.reserve_withdraw.reserve_reference);
    ref = find_command (is,
                        cmd->details.reserve_withdraw.reserve_reference);
    GNUNET_assert (NULL != ref);
    GNUNET_assert (OC_ADMIN_ADD_INCOMING == ref->oc);
    if (NULL != cmd->details.reserve_withdraw.amount)
    {
      if (GNUNET_OK !=
          TALER_string_to_amount (cmd->details.reserve_withdraw.amount,
                                  &amount))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Failed to parse amount `%s' at %u\n",
                    cmd->details.reserve_withdraw.amount,
                    is->ip);
        fail (is);
        return;
      }
      cmd->details.reserve_withdraw.pk = find_pk (is->keys,
                                                  &amount);
    }
    if (NULL == cmd->details.reserve_withdraw.pk)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Failed to determine denomination key at %u\n",
                  is->ip);
      fail (is);
      return;
    }

    /* create coin's private key */
    {
      struct GNUNET_CRYPTO_EddsaPrivateKey *priv;

      priv = GNUNET_CRYPTO_eddsa_key_create ();
      cmd->details.reserve_withdraw.coin_priv.eddsa_priv = *priv;
      GNUNET_free (priv);
    }
    GNUNET_CRYPTO_eddsa_key_get_public (&cmd->details.reserve_withdraw.coin_priv.eddsa_priv,
                                        &coin_pub.eddsa_pub);
    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK,
                                &cmd->details.reserve_withdraw.blinding_key,
                                sizeof (cmd->details.reserve_withdraw.blinding_key));

    cmd->details.reserve_withdraw.wsh
      = TALER_EXCHANGE_reserve_withdraw (exchange,
                                         cmd->details.reserve_withdraw.pk,
                                         &ref->details.admin_add_incoming.reserve_priv,
                                         &cmd->details.reserve_withdraw.coin_priv,
                                         &cmd->details.reserve_withdraw.blinding_key,
                                         &reserve_withdraw_cb,
                                         is);
    if (NULL == cmd->details.reserve_withdraw.wsh)
    {
      GNUNET_break (0);
      fail (is);
      return;
    }
    return;
  case OC_PROPOSAL:
    {
      json_t *order;
      json_error_t error;

      order = json_loads (cmd->details.proposal.order,
                          JSON_REJECT_DUPLICATES,
                          &error);
      if (NULL != instance)
      {

        json_t *merchant;

        merchant = json_object ();
        json_object_set_new (merchant,
                             "instance",
                             json_string (instance));
        json_object_set (order, "merchant", merchant);
      }
      if (NULL == order)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Failed to parse the order `%s' at command #%u: %s at %u\n",
                    cmd->details.proposal.order,
                    is->ip,
                    error.text,
                    (unsigned int) error.column);
        fail (is);
        return;
      }
      cmd->details.proposal.po
        = TALER_MERCHANT_order_put (ctx,
                                    MERCHANT_URI,
                                    order,
                                    &proposal_cb,
                                    is);
      json_decref (order);
      if (NULL == cmd->details.proposal.po)
      {
        GNUNET_break (0);
        fail (is);
        return;
      }
      return;
    }
  case OC_PAY:
    {
      struct TALER_MERCHANT_PayCoin pc;
      const char *order_id;
      struct GNUNET_TIME_Absolute refund_deadline;
      struct GNUNET_TIME_Absolute pay_deadline;
      struct GNUNET_TIME_Absolute timestamp;
      struct GNUNET_HashCode h_wire;
      struct TALER_MerchantPublicKeyP merchant_pub;
      struct TALER_MerchantSignatureP merchant_sig;
      struct TALER_Amount total_amount;
      struct TALER_Amount max_fee;
      const char *error_name;
      unsigned int error_line;

      /* get proposal */
      ref = find_command (is,
                          cmd->details.pay.contract_ref);
      GNUNET_assert (NULL != ref);
      merchant_sig = ref->details.proposal.merchant_sig;
      GNUNET_assert (NULL != ref->details.proposal.proposal_data);
      {
        /* Get information that need to be replied in the deposit permission */
        struct GNUNET_JSON_Specification spec[] = {
          GNUNET_JSON_spec_string ("order_id", &order_id),
          GNUNET_JSON_spec_absolute_time ("refund_deadline", &refund_deadline),
          GNUNET_JSON_spec_absolute_time ("pay_deadline", &pay_deadline),
          GNUNET_JSON_spec_absolute_time ("timestamp", &timestamp),
          GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
          GNUNET_JSON_spec_fixed_auto ("H_wire", &h_wire),
          TALER_JSON_spec_amount ("amount", &total_amount),
          TALER_JSON_spec_amount ("max_fee", &max_fee),
          GNUNET_JSON_spec_end()
        };

        if (GNUNET_OK !=
            GNUNET_JSON_parse (ref->details.proposal.proposal_data,
                               spec,
                               &error_name,
                               &error_line))
        {
          GNUNET_break_op (0);
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      "Parser failed on %s:%u\n",
                      error_name,
                      error_line);
          fail (is);
          return;
        }
        cmd->details.pay.merchant_pub = merchant_pub;
      }

      {
        const struct Command *coin_ref;
	memset (&pc, 0, sizeof (pc));
	coin_ref = find_command (is,
	                         cmd->details.pay.coin_ref);
	GNUNET_assert (NULL != ref);
	switch (coin_ref->oc)
	{
	case OC_WITHDRAW_SIGN:
	  pc.coin_priv = coin_ref->details.reserve_withdraw.coin_priv;
	  pc.denom_pub = coin_ref->details.reserve_withdraw.pk->key;
	  pc.denom_sig = coin_ref->details.reserve_withdraw.sig;
          pc.denom_value = coin_ref->details.reserve_withdraw.pk->value;
	  break;
	default:
	  GNUNET_assert (0);
	}

	if (GNUNET_OK !=
	    TALER_string_to_amount (cmd->details.pay.amount_without_fee,
				    &pc.amount_without_fee))
	{
	  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		      "Failed to parse amount `%s' at %u\n",
		      cmd->details.pay.amount_without_fee,
		      is->ip);
	  fail (is);
	  return;
	}

	if (GNUNET_OK !=
	    TALER_string_to_amount (cmd->details.pay.amount_with_fee,
				    &pc.amount_with_fee))
	{
	  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		      "Failed to parse amount `%s' at %u\n",
		      cmd->details.pay.amount_with_fee,
		      is->ip);
	  fail (is);
	  return;
	}
      }

      cmd->details.pay.ph
	= TALER_MERCHANT_pay_wallet (ctx,
				     MERCHANT_URI,
                                     instance,
				     &ref->details.proposal.hash,
				     &total_amount,
				     &max_fee,
				     &merchant_pub,
                                     &merchant_sig,
				     timestamp,
				     refund_deadline,
				     pay_deadline,
				     &h_wire,
				     EXCHANGE_URI,
                                     order_id,
				     1 /* num_coins */,
				     &pc /* coins */,
				     &pay_cb,
				     is);
    }
    if (NULL == cmd->details.pay.ph)
    {
      GNUNET_break (0);
      fail (is);
      return;
    }
    return;
  case OC_RUN_AGGREGATOR:
    {
      const struct GNUNET_DISK_FileHandle *pr;

      cmd->details.run_aggregator.aggregator_proc
        = GNUNET_OS_start_process (GNUNET_NO,
                                   GNUNET_OS_INHERIT_STD_ALL,
                                   NULL, NULL, NULL,
                                   "taler-exchange-aggregator",
                                   "taler-exchange-aggregator",
                                   "-c", "test_merchant_api.conf",
                                   "-t", /* exit when done */
                                   NULL);
      if (NULL == cmd->details.run_aggregator.aggregator_proc)
      {
        GNUNET_break (0);
        fail (is);
        return;
      }
      pr = GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ);
      cmd->details.run_aggregator.child_death_task
        = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
                                          pr,
                                          &maint_child_death, is);
      return;
    }
  case OC_CHECK_BANK_TRANSFER:
    {
      if (GNUNET_OK !=
          TALER_string_to_amount (cmd->details.check_bank_transfer.amount,
                                  &amount))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Failed to parse amount `%s' at %u\n",
                    cmd->details.reserve_withdraw.amount,
                    is->ip);
        fail (is);
        return;
      }
      if (GNUNET_OK !=
          TALER_FAKEBANK_check (fakebank,
                          &amount,
                          cmd->details.check_bank_transfer.account_debit,
                          cmd->details.check_bank_transfer.account_credit,
                          &cmd->details.check_bank_transfer.wtid))
      {
        GNUNET_break (0);
        fail (is);
        return;
      }
      next_command (is);
      return;
    }
  case OC_CHECK_BANK_TRANSFERS_EMPTY:
    {
      if (GNUNET_OK !=
          TALER_FAKEBANK_check_empty (fakebank))
      {
        GNUNET_break (0);
        fail (is);
        return;
      }
      next_command (is);
      return;
    }
  case OC_TRACK_TRANSFER:
    ref = find_command (is,
                        cmd->details.track_transfer.check_bank_ref);
    GNUNET_assert (NULL != ref);
    cmd->details.track_transfer.tdo =
      TALER_MERCHANT_track_transfer (ctx,
                                     MERCHANT_URI,
                                     instance,
                                     &ref->details.check_bank_transfer.wtid,
                                     EXCHANGE_URI,
                                     &track_transfer_cb,
                                     is);
    return;
  case OC_TRACK_TRANSACTION:
  {
    const struct Command *proposal_ref;
    const char *order_id;

    ref = find_command (is,
                        cmd->details.track_transaction.pay_ref);
    GNUNET_assert (NULL != ref);
    proposal_ref = find_command (is,
                                 ref->details.pay.contract_ref);
    order_id = json_string_value (json_object_get (proposal_ref->details.proposal.proposal_data,
                                        "order_id"));
    cmd->details.track_transaction.tth =
      TALER_MERCHANT_track_transaction (ctx,
                                        MERCHANT_URI,
                                        instance,
                                        order_id,
                                        &track_transaction_cb,
                                        is);
  }
    return;
  case OC_HISTORY:

    if (NULL ==
       (cmd->details.history.ho = TALER_MERCHANT_history (ctx,
	                                                  MERCHANT_URI,
                                                          instance,
	                                                  cmd->details.history.date,
							  history_cb,
							  is)))
    {
      fail (is);
      return;
    }
  break;

  default:
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unknown instruction %d at %u (%s)\n",
                cmd->oc,
                is->ip,
                cmd->label);
    fail (is);
    return;
  }
}


/**
 * Function run when the test times out.
 *
 * @param cls NULL
 */
static void
do_timeout (void *cls)
{
  timeout_task = NULL;
  GNUNET_SCHEDULER_shutdown ();
}


/**
 * Function run when the test terminates (good or bad).
 * Cleans up our state.
 *
 * @param cls the interpreter state.
 */
static void
do_shutdown (void *cls)
{
  struct InterpreterState *is = cls;
  struct Command *cmd;
  unsigned int i;

  if (NULL != timeout_task)
  {
    GNUNET_SCHEDULER_cancel (timeout_task);
    timeout_task = NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Shutdown executing\n");
  for (i=0;OC_END != (cmd = &is->commands[i])->oc;i++)
  {
    switch (cmd->oc)
    {
    case OC_END:
      GNUNET_assert (0);
      break;
    case OC_PROPOSAL_LOOKUP:
      if (NULL != cmd->details.proposal_lookup.plo)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_MERCHANT_proposal_lookup_cancel (cmd->details.proposal_lookup.plo);
      }
        break;

    case OC_ADMIN_ADD_INCOMING:
      if (NULL != cmd->details.admin_add_incoming.aih)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_EXCHANGE_admin_add_incoming_cancel (cmd->details.admin_add_incoming.aih);
        cmd->details.admin_add_incoming.aih = NULL;
      }
      break;
    case OC_WITHDRAW_STATUS:
      if (NULL != cmd->details.reserve_status.wsh)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_EXCHANGE_reserve_status_cancel (cmd->details.reserve_status.wsh);
        cmd->details.reserve_status.wsh = NULL;
      }
      break;
    case OC_WITHDRAW_SIGN:
      if (NULL != cmd->details.reserve_withdraw.wsh)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_EXCHANGE_reserve_withdraw_cancel (cmd->details.reserve_withdraw.wsh);
        cmd->details.reserve_withdraw.wsh = NULL;
      }
      if (NULL != cmd->details.reserve_withdraw.sig.rsa_signature)
      {
        GNUNET_CRYPTO_rsa_signature_free (cmd->details.reserve_withdraw.sig.rsa_signature);
        cmd->details.reserve_withdraw.sig.rsa_signature = NULL;
      }
      break;
    case OC_PROPOSAL:
      if (NULL != cmd->details.proposal.po)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_MERCHANT_proposal_cancel (cmd->details.proposal.po);
        cmd->details.proposal.po = NULL;
      }
      if (NULL != cmd->details.proposal.proposal_data)
      {
        json_decref (cmd->details.proposal.proposal_data);
        cmd->details.proposal.proposal_data = NULL;
      }
      break;
    case OC_PAY:
      if (NULL != cmd->details.pay.ph)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Command %u (%s) did not complete\n",
                    i,
                    cmd->label);
        TALER_MERCHANT_pay_cancel (cmd->details.pay.ph);
        cmd->details.pay.ph = NULL;
      }
      break;
    case OC_RUN_AGGREGATOR:
      if (NULL != cmd->details.run_aggregator.aggregator_proc)
      {
        GNUNET_break (0 ==
                      GNUNET_OS_process_kill (cmd->details.run_aggregator.aggregator_proc,
                                              SIGKILL));
        GNUNET_OS_process_wait (cmd->details.run_aggregator.aggregator_proc);
        GNUNET_OS_process_destroy (cmd->details.run_aggregator.aggregator_proc);
        cmd->details.run_aggregator.aggregator_proc = NULL;
      }
      if (NULL != cmd->details.run_aggregator.child_death_task)
      {
        GNUNET_SCHEDULER_cancel (cmd->details.run_aggregator.child_death_task);
        cmd->details.run_aggregator.child_death_task = NULL;
      }
      break;
    case OC_CHECK_BANK_TRANSFER:
      break;
    case OC_CHECK_BANK_TRANSFERS_EMPTY:
      break;
    case OC_TRACK_TRANSFER:
      if (NULL != cmd->details.track_transfer.tdo)
      {
        TALER_MERCHANT_track_transfer_cancel (cmd->details.track_transfer.tdo);
        cmd->details.track_transfer.tdo = NULL;
      }
      break;
    case OC_TRACK_TRANSACTION:
      if (NULL != cmd->details.track_transaction.tth)
      {
        TALER_MERCHANT_track_transaction_cancel (cmd->details.track_transaction.tth);
        cmd->details.track_transaction.tth = NULL;
      }
      break;
    case OC_HISTORY:

      if (NULL != cmd->details.history.ho)
      {
        TALER_MERCHANT_history_cancel (cmd->details.history.ho);
        cmd->details.history.ho = NULL;
      }
      break;

    default:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Shutdown: unknown instruction %d at %u (%s)\n",
                  cmd->oc,
                  i,
                  cmd->label);
      break;
    }
  }
  if (NULL != is->task)
  {
    GNUNET_SCHEDULER_cancel (is->task);
    is->task = NULL;
  }
  GNUNET_free (is);
  GNUNET_free_non_null (instances);
  if (NULL != exchange)
  {
    TALER_EXCHANGE_disconnect (exchange);
    exchange = NULL;
  }
  if (NULL != ctx)
  {
    GNUNET_CURL_fini (ctx);
    ctx = NULL;
  }
  if (NULL != rc)
  {
    GNUNET_CURL_gnunet_rc_destroy (rc);
    rc = NULL;
  }
  TALER_FAKEBANK_stop (fakebank);
  fakebank = NULL;

  db->drop_tables (db->cls);
  TALER_MERCHANTDB_plugin_unload (db);
  GNUNET_CONFIGURATION_destroy (cfg);
}


/**
 * Functions of this type are called to provide the retrieved signing and
 * denomination keys of the exchange.  No TALER_EXCHANGE_*() functions should be called
 * in this callback.
 *
 * @param cls closure
 * @param keys information about keys of the exchange
 */
static void
cert_cb (void *cls,
         const struct TALER_EXCHANGE_Keys *keys)
{
  struct InterpreterState *is = cls;

  /* check that keys is OK */
#define ERR(cond) do { if(!(cond)) break; GNUNET_break (0); GNUNET_SCHEDULER_shutdown(); return; } while (0)
  ERR (NULL == keys);
  ERR (0 == keys->num_sign_keys);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Read %u signing keys\n",
              keys->num_sign_keys);
  ERR (0 == keys->num_denom_keys);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Read %u denomination keys\n",
              keys->num_denom_keys);
#undef ERR

  /* run actual tests via interpreter-loop */
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Certificate callback invoked, starting interpreter\n");
  is->keys = keys;
  is->task = GNUNET_SCHEDULER_add_now (&interpreter_run,
                                       is);
}


/**
 * Signal handler called for SIGCHLD.  Triggers the
 * respective handler by writing to the trigger pipe.
 */
static void
sighandler_child_death ()
{
  static char c;
  int old_errno = errno;	/* back-up errno */

  GNUNET_break (1 ==
		GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
					(sigpipe, GNUNET_DISK_PIPE_END_WRITE),
					&c, sizeof (c)));
  errno = old_errno;		/* restore errno */
}

/**
 * Main function that will be run by the scheduler.
 *
 * @param cls closure
 */
static void
run (void *cls)
{
  struct InterpreterState *is;
  static struct Command commands[] =
  {
    /* Fill reserve with EUR:5.01, as withdraw fee is 1 ct per config */
    { .oc = OC_ADMIN_ADD_INCOMING,
      .label = "create-reserve-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.admin_add_incoming.sender_details = "{ \"type\":\"test\", \"bank_uri\":\"" BANK_URI "\", \"account_number\":62, \"uuid\":1 }",
      .details.admin_add_incoming.transfer_details = "{ \"uuid\": 1}",
      .details.admin_add_incoming.amount = "EUR:5.01" },

    /* Withdraw a 5 EUR coin, at fee of 1 ct */
    { .oc = OC_WITHDRAW_SIGN,
      .label = "withdraw-coin-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.reserve_withdraw.reserve_reference = "create-reserve-1",
      .details.reserve_withdraw.amount = "EUR:5" },
    /* Check that deposit and withdraw operation are in history, and
       that the balance is now at zero */
    { .oc = OC_WITHDRAW_STATUS,
      .label = "withdraw-status-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.reserve_status.reserve_reference = "create-reserve-1",
      .details.reserve_status.expected_balance = "EUR:0" },
    /* Create proposal */
    { .oc = OC_PROPOSAL,
      .label = "create-proposal-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.proposal.order = "{\
                  \"max_fee\":\
                     {\"currency\":\"EUR\", \"value\":0, \"fraction\":50000000},\
                  \"order_id\":\"1\",\
                  \"timestamp\":\"\\/Date(42)\\/\",\
                  \"refund_deadline\":\"\\/Date(0)\\/\",\
                  \"pay_deadline\":\"\\/Date(9999999999)\\/\",\
                  \"amount\":{\"currency\":\"EUR\", \"value\":5, \"fraction\":0},\
		  \"summary\": \"merchant-lib testcase\",\
                  \"products\":\
                     [ {\"description\":\"ice cream\", \"value\":\"{EUR:5}\"} ] }"},

    { .oc = OC_PAY,
      .label = "deposit-simple",
      .expected_response_code = MHD_HTTP_OK,
      .details.pay.contract_ref = "create-proposal-1",
      .details.pay.coin_ref = "withdraw-coin-1",
      .details.pay.amount_with_fee = "EUR:5",
      .details.pay.amount_without_fee = "EUR:4.99" },

    /* Try to replay payment reusing coin */
    { .oc = OC_PAY,
      .label = "replay-simple",
      .expected_response_code = MHD_HTTP_OK,
      .details.pay.contract_ref = "create-proposal-1",
      .details.pay.coin_ref = "withdraw-coin-1",
      .details.pay.amount_with_fee = "EUR:5",
      .details.pay.amount_without_fee = "EUR:4.99" },


    /* Create another contract */
    { .oc = OC_PROPOSAL,
      .label = "create-proposal-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.proposal.order = "{\
                  \"max_fee\":\
                     {\"currency\":\"EUR\", \"value\":0, \"fraction\":50000000},\
                  \"order_id\":\"2\",\
                  \"timestamp\":\"\\/Date(42)\\/\",\
                  \"refund_deadline\":\"\\/Date(0)\\/\",\
                  \"pay_deadline\":\"\\/Date(9999999999)\\/\",\
                  \"amount\":{\"currency\":\"EUR\", \"value\":5, \"fraction\":0},\
                  \"products\":\
                     [ {\"description\":\"ice cream\", \"value\":\"{EUR:5}\"} ] }" },

    /* Try to double-spend the 5 EUR coin at the same merchant (but different
       transaction ID) */
    { .oc = OC_PAY,
      .label = "deposit-double-2",
      .expected_response_code = MHD_HTTP_FORBIDDEN,
      .details.pay.contract_ref = "create-proposal-2",
      .details.pay.coin_ref = "withdraw-coin-1",
      .details.pay.amount_with_fee = "EUR:5",
      .details.pay.amount_without_fee = "EUR:4.99" },

    /* Fill second reserve with EUR:1 */
    { .oc = OC_ADMIN_ADD_INCOMING,
      .label = "create-reserve-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.admin_add_incoming.sender_details = "{ \"type\":\"test\", \"bank_uri\":\"" BANK_URI "\", \"account_number\":63, \"uuid\":2 }",
      .details.admin_add_incoming.transfer_details = "{ \"uuid\": 2}",
      .details.admin_add_incoming.amount = "EUR:1" },

    /* Add another 4.01 EUR to reserve #2 */
    { .oc = OC_ADMIN_ADD_INCOMING,
      .label = "create-reserve-2b",
      .expected_response_code = MHD_HTTP_OK,
      .details.admin_add_incoming.reserve_reference = "create-reserve-2",
      .details.admin_add_incoming.sender_details = "{ \"type\":\"test\", \"bank_uri\":\"" BANK_URI "\", \"account_number\":63, \"uuid\":3  }",
      .details.admin_add_incoming.transfer_details = "{ \"uuid\": 3}",
      .details.admin_add_incoming.amount = "EUR:4.01" },

    /* Withdraw a 5 EUR coin, at fee of 1 ct */
    { .oc = OC_WITHDRAW_SIGN,
      .label = "withdraw-coin-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.reserve_withdraw.reserve_reference = "create-reserve-2",
      .details.reserve_withdraw.amount = "EUR:5" },

    /* Proposal lookup */
    {
      .oc = OC_PROPOSAL_LOOKUP, 
      .label = "fetch-proposal-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.proposal_lookup.proposal_reference = "create-proposal-2" },

    /* Check nothing happened on the bank side so far */
    { .oc = OC_CHECK_BANK_TRANSFERS_EMPTY,
      .label = "check_bank_empty" },


    /* Run transfers. */
    { .oc = OC_RUN_AGGREGATOR,
      .label = "run-aggregator" },

    /* Obtain WTID of the transfer */
    { .oc = OC_CHECK_BANK_TRANSFER,
      .label = "check_bank_transfer-499c",
      .details.check_bank_transfer.amount = "EUR:4.99",
      .details.check_bank_transfer.account_debit = 2, /* exchange-outgoing */
      .details.check_bank_transfer.account_credit = 62 /* merchant */
    },

    /* Check that there are no other unusual transfers */
    { .oc = OC_CHECK_BANK_TRANSFERS_EMPTY,
      .label = "check_bank_empty" },

    { .oc = OC_TRACK_TRANSACTION,
      .label = "track-transaction-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transaction.expected_transfer_ref = "check_bank_transfer-499c",
      .details.track_transaction.pay_ref = "deposit-simple"  
    },

    /* Trace the WTID back to the original transaction */
    { .oc = OC_TRACK_TRANSFER,
      .label = "track-transfer-1",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transfer.check_bank_ref = "check_bank_transfer-499c",
      .details.track_transfer.expected_pay_ref = "deposit-simple"
    },
    { .oc = OC_TRACK_TRANSFER,
      .label = "track-transfer-1-again",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transfer.check_bank_ref = "check_bank_transfer-499c",
      .details.track_transfer.expected_pay_ref = "deposit-simple"
    },

    /* Pay again successfully on 2nd contract */
    { .oc = OC_PAY,
      .label = "deposit-simple-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.pay.contract_ref = "create-proposal-2",
      .details.pay.coin_ref = "withdraw-coin-2",
      .details.pay.amount_with_fee = "EUR:5",
      .details.pay.amount_without_fee = "EUR:4.99" },

    /* Run transfers. */
    { .oc = OC_RUN_AGGREGATOR,
      .label = "run-aggregator-2" },

    /* Obtain WTID of the transfer */
    { .oc = OC_CHECK_BANK_TRANSFER,
      .label = "check_bank_transfer-499c-2",
      .details.check_bank_transfer.amount = "EUR:4.99",
      .details.check_bank_transfer.account_debit = 2, /* exchange-outgoing */
      .details.check_bank_transfer.account_credit = 62 /* merchant */
    },

    /* Check that there are no other unusual transfers */
    { .oc = OC_CHECK_BANK_TRANSFERS_EMPTY,
      .label = "check_bank_empty" },

    /* Trace the WTID back to the original transaction */
    { .oc = OC_TRACK_TRANSFER,
      .label = "track-transfer-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transfer.check_bank_ref = "check_bank_transfer-499c-2",
      .details.track_transfer.expected_pay_ref = "deposit-simple-2"
    },
    { .oc = OC_TRACK_TRANSFER,
      .label = "track-transfer-2-again",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transfer.check_bank_ref = "check_bank_transfer-499c-2",
      .details.track_transfer.expected_pay_ref = "deposit-simple-2"
    },

    { .oc = OC_TRACK_TRANSACTION,
      .label = "track-transaction-2",
      .expected_response_code = MHD_HTTP_OK,
      .details.track_transaction.expected_transfer_ref = "check_bank_transfer-499c-2",
      .details.track_transaction.pay_ref = "deposit-simple-2"  
    },

    { .oc = OC_HISTORY,
      .label = "history-1",
      .expected_response_code = MHD_HTTP_OK,
      /*all records to be returned*/
      .details.history.date.abs_value_us = 0,
      .details.history.nresult = 2
    },
    { .oc = OC_HISTORY,
      .label = "history-2",
      .expected_response_code = MHD_HTTP_OK,
      /*no records to be returned, as limit is in the future*/
      .details.history.date.abs_value_us = 43 * 1000LL * 1000LL, 
      .details.history.nresult = 0
    },

    /* end of testcase */
    { .oc = OC_END }
  };

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
	      "Interpreter initializing\n");
  fakebank = TALER_FAKEBANK_start (BANK_PORT);
  if (NULL == fakebank)
  {
    fprintf (stderr,
             "\nFailed to start fake bank service\n");
    result = 77;
    return;
  }

  is = GNUNET_new (struct InterpreterState);
  is->commands = commands;

  ctx = GNUNET_CURL_init (&GNUNET_CURL_gnunet_scheduler_reschedule,
                          &rc);
  GNUNET_assert (NULL != ctx);
  rc = GNUNET_CURL_gnunet_rc_create (ctx);
  exchange = TALER_EXCHANGE_connect (ctx,
                                     EXCHANGE_URI,
                                     &cert_cb, is,
                                     TALER_EXCHANGE_OPTION_END);
  GNUNET_assert (NULL != exchange);
  timeout_task
    = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
                                    (GNUNET_TIME_UNIT_SECONDS, 150),
                                    &do_timeout, NULL);
  GNUNET_SCHEDULER_add_shutdown (&do_shutdown, is);
}


/**
 * Main function for the testcase for the exchange API.
 *
 * @param argc expected to be 1
 * @param argv expected to only contain the program name
 */
int
main (int argc,
      char * const *argv)
{
  char *_instances;
  char *token;
  struct GNUNET_OS_Process *proc;
  struct GNUNET_OS_Process *exchanged;
  struct GNUNET_OS_Process *merchantd;
  unsigned int cnt;
  struct GNUNET_SIGNAL_Context *shc_chld;

  unsetenv ("XDG_DATA_HOME");
  unsetenv ("XDG_CONFIG_HOME");
  GNUNET_log_setup ("test-merchant-api",
                    "DEBUG",
                    NULL);
  cfg = GNUNET_CONFIGURATION_create ();
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONFIGURATION_load (cfg,
                                            "test_merchant_api.conf"));
  GNUNET_break (GNUNET_CONFIGURATION_get_value_string (cfg,
                                                       "merchant",
                                                       "INSTANCES",
                                                       &_instances));
  GNUNET_break (NULL != (token = strtok (_instances, " ")));
  GNUNET_array_append (instances, ninstances, token);

  while (NULL != (token = strtok (NULL, " ")))
    GNUNET_array_append(instances, ninstances, token);

  instance = instances[instance_idx];
  db = TALER_MERCHANTDB_plugin_load (cfg);
  if (NULL == db)
  {
    GNUNET_CONFIGURATION_destroy (cfg);
    return 77;
  }
  (void) db->drop_tables (db->cls);
  if (GNUNET_OK != db->initialize (db->cls))
  {
    TALER_MERCHANTDB_plugin_unload (db);
    GNUNET_CONFIGURATION_destroy (cfg);
    return 77;
  }
  proc = GNUNET_OS_start_process (GNUNET_NO,
                                  GNUNET_OS_INHERIT_STD_ALL,
                                  NULL, NULL, NULL,
                                  "taler-exchange-keyup",
                                  "taler-exchange-keyup",
                                  "-c", "test_merchant_api.conf",
                                  NULL);
  if (NULL == proc)
  {
    fprintf (stderr,
             "Failed to run taler-exchange-keyup. Check your PATH.\n");
    return 77;
  }
  GNUNET_OS_process_wait (proc);
  GNUNET_OS_process_destroy (proc);
  proc = GNUNET_OS_start_process (GNUNET_NO,
                                  GNUNET_OS_INHERIT_STD_ALL,
                                  NULL, NULL, NULL,
                                  "taler-exchange-dbinit",
                                  "taler-exchange-dbinit",
                                  "-c", "test_merchant_api.conf",
                                  "-r",
                                  NULL);
  if (NULL == proc)
  {
    fprintf (stderr,
             "Failed to run taler-exchange-dbinit. Check your PATH.\n");
    return 77;
  }
  GNUNET_OS_process_wait (proc);
  GNUNET_OS_process_destroy (proc);
  exchanged = GNUNET_OS_start_process (GNUNET_NO,
                                       GNUNET_OS_INHERIT_STD_ALL,
                                       NULL, NULL, NULL,
                                       "taler-exchange-httpd",
                                       "taler-exchange-httpd",
                                       "-c", "test_merchant_api.conf",
                                       NULL);
  if (NULL == exchanged)
  {
    fprintf (stderr,
             "Failed to run taler-exchange-httpd. Check your PATH.\n");
    return 77;
  }
  /* give child time to start and bind against the socket */
  fprintf (stderr,
           "Waiting for taler-exchange-httpd to be ready\n");
  cnt = 0;
  do
    {
      fprintf (stderr, ".");
      sleep (1);
      cnt++;
      if (cnt > 60)
      {
        fprintf (stderr,
                 "\nFailed to start taler-exchange-httpd\n");
        GNUNET_OS_process_kill (exchanged,
                                SIGKILL);
        GNUNET_OS_process_wait (exchanged);
        GNUNET_OS_process_destroy (exchanged);
        return 77;
      }
    }
  while (0 != system ("wget -q -t 1 -T 1 " EXCHANGE_URI "keys -o /dev/null -O /dev/null"));
  fprintf (stderr, "\n");
  merchantd = GNUNET_OS_start_process (GNUNET_NO,
                                       GNUNET_OS_INHERIT_STD_ALL,
                                       NULL, NULL, NULL,
                                       "valgrind",
                                       "valgrind",
                                       "taler-merchant-httpd",
                                       "-c", "test_merchant_api.conf",
                                       "-L", "DEBUG",
                                       NULL);
  if (NULL == merchantd)
  {
    fprintf (stderr,
             "Failed to run taler-merchant-httpd. Check your PATH.\n");
    GNUNET_OS_process_kill (exchanged,
                            SIGKILL);
    GNUNET_OS_process_wait (exchanged);
    GNUNET_OS_process_destroy (exchanged);
    return 77;
  }
  /* give child time to start and bind against the socket */
  fprintf (stderr,
           "Waiting for taler-merchant-httpd to be ready\n");
  cnt = 0;
  do
    {
      fprintf (stderr, ".");
      sleep (1);
      cnt++;
      if (cnt > 60)
      {
        fprintf (stderr,
                 "\nFailed to start taler-merchant-httpd\n");
        GNUNET_OS_process_kill (merchantd,
                                SIGKILL);
        GNUNET_OS_process_wait (merchantd);
        GNUNET_OS_process_destroy (merchantd);
        GNUNET_OS_process_kill (exchanged,
                                SIGKILL);
        GNUNET_OS_process_wait (exchanged);
        GNUNET_OS_process_destroy (exchanged);
        return 77;
      }
    }
  while (0 != system ("wget -q -t 1 -T 1 " MERCHANT_URI " -o /dev/null -O /dev/null"));
  fprintf (stderr, "\n");

  result = GNUNET_SYSERR;
  sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_NO, GNUNET_NO);
  GNUNET_assert (NULL != sigpipe);
  shc_chld = GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD,
                                            &sighandler_child_death);
  GNUNET_SCHEDULER_run (&run, NULL);
  GNUNET_SIGNAL_handler_uninstall (shc_chld);
  shc_chld = NULL;
  GNUNET_DISK_pipe_close (sigpipe);
  GNUNET_OS_process_kill (merchantd,
                          SIGTERM);
  GNUNET_OS_process_wait (merchantd);
  GNUNET_OS_process_destroy (merchantd);
  GNUNET_OS_process_kill (exchanged,
                          SIGTERM);
  GNUNET_OS_process_wait (exchanged);
  GNUNET_OS_process_destroy (exchanged);
  if (77 == result)
    return 77;
  return (GNUNET_OK == result) ? 0 : 1;
}