fee_schedule_set_fee.cpp

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/*
 * Copyright (c) 2015 Cryptonomex, Inc., and contributors.
 *
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 */
#include <graphene/protocol/fee_schedule.hpp>
 
namespace graphene { namespace protocol {
 
   struct set_fee_visitor
   {
      using result_type = void;
 
      asset _fee;
 
      explicit set_fee_visitor( const asset& f ):_fee(f){}
 
      template<typename OpType>
      void operator()( OpType& op )const
      {
         op.fee = _fee;
      }
   };
 
   asset fee_schedule::set_fee( operation& op, const price& core_exchange_rate )const
   {
      auto f = calculate_fee( op, core_exchange_rate );
      for( size_t i=0; i<MAX_FEE_STABILIZATION_ITERATION; ++i )
      {
         op.visit( set_fee_visitor( f ) );
         auto f2 = calculate_fee( op, core_exchange_rate );
         if( f >= f2 )
            break;
         f = f2;
         if( 0 == i )
         {
            // no need for warnings on later iterations
            wlog( "set_fee requires multiple iterations to stabilize with core_exchange_rate ${p} on operation ${op}",
               ("p", core_exchange_rate) ("op", op) );
         }
      }
      return f;
   }
 
} } // graphene::protocol