transfer_evaluator.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
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * THE SOFTWARE.
 */
#include <graphene/chain/transfer_evaluator.hpp>
#include <graphene/chain/account_object.hpp>
#include <graphene/chain/exceptions.hpp>
#include <graphene/chain/hardfork.hpp>
#include <graphene/chain/is_authorized_asset.hpp>

namespace graphene { namespace chain {
void_result transfer_evaluator::do_evaluate( const transfer_operation& op )
{ try {
   
   const database& d = db();

   const account_object& from_account    = op.from(d);
   const account_object& to_account      = op.to(d);
   const asset_object&   asset_type      = op.amount.asset_id(d);

   try {

      GRAPHENE_ASSERT(
         is_authorized_asset( d, from_account, asset_type ),
         transfer_from_account_not_whitelisted,
         "'from' account ${from} is not whitelisted for asset ${asset}",
         ("from",op.from)
         ("asset",op.amount.asset_id)
         );
      GRAPHENE_ASSERT(
         is_authorized_asset( d, to_account, asset_type ),
         transfer_to_account_not_whitelisted,
         "'to' account ${to} is not whitelisted for asset ${asset}",
         ("to",op.to)
         ("asset",op.amount.asset_id)
         );

      if( asset_type.is_transfer_restricted() )
      {
         GRAPHENE_ASSERT(
            from_account.id == asset_type.issuer || to_account.id == asset_type.issuer,
            transfer_restricted_transfer_asset,
            "Asset ${asset} has transfer_restricted flag enabled",
            ("asset", op.amount.asset_id)
          );
      }

      bool insufficient_balance = d.get_balance( from_account, asset_type ).amount >= op.amount.amount;
      FC_ASSERT( insufficient_balance,
                 "Insufficient Balance: ${balance}, unable to transfer '${total_transfer}' from account '${a}' to '${t}'", 
                 ("a",from_account.name)("t",to_account.name)("total_transfer",d.to_pretty_string(op.amount))("balance",d.to_pretty_string(d.get_balance(from_account, asset_type))) );

      return void_result();
   } FC_RETHROW_EXCEPTIONS( error, "Unable to transfer ${a} from ${f} to ${t}", ("a",d.to_pretty_string(op.amount))("f",op.from(d).name)("t",op.to(d).name) );

}  FC_CAPTURE_AND_RETHROW( (op) ) }

void_result transfer_evaluator::do_apply( const transfer_operation& o )
{ try {
   db().adjust_balance( o.from, -o.amount );
   db().adjust_balance( o.to, o.amount );
   return void_result();
} FC_CAPTURE_AND_RETHROW( (o) ) }



void_result override_transfer_evaluator::do_evaluate( const override_transfer_operation& op )
{ try {
   const database& d = db();

   const asset_object&   asset_type      = op.amount.asset_id(d);
   GRAPHENE_ASSERT(
      asset_type.can_override(),
      override_transfer_not_permitted,
      "override_transfer not permitted for asset ${asset}",
      ("asset", op.amount.asset_id)
      );
   FC_ASSERT( asset_type.issuer == op.issuer );

   const account_object& from_account    = op.from(d);
   const account_object& to_account      = op.to(d);

   FC_ASSERT( is_authorized_asset( d, to_account, asset_type ),
              "The to_account is not allowed to transact the asset" );
   // Since hard fork core-2295, do not check asset authorization limitations on from_account for override_transfer
   // TODO code cleanup: if applicable (could be false due to proposals),
   //      remove the check and the assertion below after the hard fork time, keep the comment about reasoning above
   if( !HARDFORK_CORE_2295_PASSED(d.head_block_time()) )
   {
      FC_ASSERT( is_authorized_asset( d, from_account, asset_type ),
                 "The from_account is not allowed to transact the asset" );
   }

   FC_ASSERT( d.get_balance( from_account, asset_type ).amount >= op.amount.amount,
              "", ("total_transfer",op.amount)("balance",d.get_balance(from_account, asset_type).amount) );

   return void_result();
} FC_CAPTURE_AND_RETHROW( (op) ) }

void_result override_transfer_evaluator::do_apply( const override_transfer_operation& o )
{ try {
   db().adjust_balance( o.from, -o.amount );
   db().adjust_balance( o.to, o.amount );
   return void_result();
} FC_CAPTURE_AND_RETHROW( (o) ) }

} } // graphene::chain