nicer error reporting

src/bank-lib/bank_api_history.c

@@ -174,7 +174,7 @@ handle_history_finished (void *cls,
   switch (response_code)
   {
   case 0:
-    ec = TALER_EC_INTERNAL_INVARIANT_FAILURE;
+    ec = TALER_EC_BANK_HISTORY_HTTP_FAILURE;
     break;
   case MHD_HTTP_OK:
     if (GNUNET_OK !=

src/include/taler_error_codes.h

@@ -1515,6 +1515,13 @@ enum TALER_ErrorCode
    */
   TALER_EC_BANK_HISTORY_NOT_AUHTORIZED = 4151,
 
+  /**
+   * The bank library had trouble obtaining a valid
+   * HTTP response.
+   * Returned with a status code of 0.
+   */
+  TALER_EC_BANK_HISTORY_HTTP_FAILURE = 4152,
+
   /**
    * The bank could not find the wire transfer that was supposed to
    * be rejected.

src/wire/plugin_wire_test.c

@@ -891,9 +891,10 @@ bhist_cb (void *cls,
     GNUNET_free (whh);
     break;
   default:
-    /* FIXME: consider modifying API to pass more specific error code(s)
-       back to the application. */
-    GNUNET_break (0);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Bank failed with HTTP status %u (EC: %u)\n",
+                http_status,
+                ec);
     if (NULL != whh->hres_cb)
       (void) whh->hres_cb (whh->hres_cb_cls,
                            ec,