peerplays_migrated/libraries/chain/limit_order_evaluator.cpp

/*
 * Copyright (c) 2015, Cryptonomex, Inc.
 * All rights reserved.
 *
 * This source code is provided for evaluation in private test networks only, until September 8, 2015. After this date, this license expires and
 * the code may not be used, modified or distributed for any purpose. Redistribution and use in source and binary forms, with or without modification,
 * are permitted until September 8, 2015, provided that the following conditions are met:
 *
 * 1. The code and/or derivative works are used only for private test networks consisting of no more than 10 P2P nodes.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <graphene/chain/limit_order_evaluator.hpp>
#include <graphene/chain/account_object.hpp>
#include <graphene/chain/limit_order_object.hpp>
#include <fc/uint128.hpp>

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

   FC_ASSERT( op.expiration >= d.head_block_time() );

   _seller        = this->fee_paying_account;
   _sell_asset    = &op.amount_to_sell.asset_id(d);
   _receive_asset = &op.min_to_receive.asset_id(d);

   if( _sell_asset->options.whitelist_markets.size() )
      FC_ASSERT( _sell_asset->options.whitelist_markets.find(_receive_asset->id) != _sell_asset->options.whitelist_markets.end() );
   if( _sell_asset->options.blacklist_markets.size() )
      FC_ASSERT( _sell_asset->options.blacklist_markets.find(_receive_asset->id) == _sell_asset->options.blacklist_markets.end() );

   if( _sell_asset->enforce_white_list() ) FC_ASSERT( _seller->is_authorized_asset( *_sell_asset ) );
   if( _receive_asset->enforce_white_list() ) FC_ASSERT( _seller->is_authorized_asset( *_receive_asset ) );

   FC_ASSERT( d.get_balance( *_seller, *_sell_asset ) >= op.amount_to_sell, "insufficient balance",
              ("balance",d.get_balance(*_seller,*_sell_asset))("amount_to_sell",op.amount_to_sell) );

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

object_id_type limit_order_create_evaluator::do_apply(const limit_order_create_operation& op)
{ try {
   const auto& seller_stats = _seller->statistics(db());
   db().modify(seller_stats, [&](account_statistics_object& bal) {
         if( op.amount_to_sell.asset_id == asset_id_type() )
         {
            bal.total_core_in_orders += op.amount_to_sell.amount;
         }
   });

   db().adjust_balance(op.seller, -op.amount_to_sell);

   const auto& new_order_object = db().create<limit_order_object>([&](limit_order_object& obj){
       obj.seller   = _seller->id;
       obj.for_sale = op.amount_to_sell.amount;
       obj.sell_price = op.get_price();
       obj.expiration = op.expiration;
   });
   limit_order_id_type order_id = new_order_object.id; // save this because we may remove the object by filling it
   bool filled = db().apply_order(new_order_object);

   FC_ASSERT( !op.fill_or_kill || filled );

   return order_id;
} FC_CAPTURE_AND_RETHROW( (op) ) }

void_result limit_order_cancel_evaluator::do_evaluate(const limit_order_cancel_operation& o)
{ try {
   database& d = db();

   _order = &o.order(d);
   FC_ASSERT( _order->seller == o.fee_paying_account );

   return void_result();
} FC_CAPTURE_AND_RETHROW( (o) ) }

asset limit_order_cancel_evaluator::do_apply(const limit_order_cancel_operation& o)
{ try {
   database& d = db();

   auto base_asset = _order->sell_price.base.asset_id;
   auto quote_asset = _order->sell_price.quote.asset_id;
   auto refunded = _order->amount_for_sale();

   db().cancel_order(*_order, false /* don't create a virtual op*/);

   // Possible optimization: order can be called by canceling a limit order iff the canceled order was at the top of the book.
   // Do I need to check calls in both assets?
   db().check_call_orders(base_asset(d));
   db().check_call_orders(quote_asset(d));

   return refunded;
} FC_CAPTURE_AND_RETHROW( (o) ) }

} } // graphene::chain