Only cancel high APR shorts on hardfork

libraries/blockchain/chain_database_v1.cpp

@@ -78,7 +78,7 @@ void chain_database_impl::execute_markets_v1( const fc::time_point_sec timestamp
   else if( pending_block_num == BTS_SHORTFIX_FORK_BLOCK_NUM )
   {
      market_engine_v7 engine( pending_state, *this );
-     engine.cancel_all_shorts();
+     engine.cancel_high_apr_shorts();
      market_transactions.insert( market_transactions.end(), engine._market_transactions.begin(), engine._market_transactions.end() );
   }
 

libraries/blockchain/include/bts/blockchain/market_engine_v7.hpp

@@ -11,6 +11,8 @@ namespace bts { namespace blockchain { namespace detail {
 
     void cancel_all_shorts();
 
+    void cancel_high_apr_shorts();
+
     static asset get_interest_paid_fixed(const asset& total_amount_paid, const price& apr, uint32_t age_seconds);
     static asset get_interest_owed_fixed(const asset& principle, const price& apr, uint32_t age_seconds);
 

libraries/blockchain/market_engine_v7.cpp

@@ -34,6 +34,31 @@ namespace bts { namespace blockchain { namespace detail {
       _pending_state->apply_changes();
   }
 
+  void market_engine_v7::cancel_high_apr_shorts()
+  {
+      static fc::uint128 max_apr = fc::uint128( BTS_BLOCKCHAIN_MAX_SHORT_APR_PCT ) * FC_REAL128_PRECISION / 100;
+
+      for( auto short_itr = _db_impl._short_db.begin(); short_itr.valid(); ++short_itr )
+      {
+          const market_index_key market_idx = short_itr.key();
+          if( market_idx.order_price.ratio <= max_apr )
+              continue;
+
+          const order_record order_rec = short_itr.value();
+          _current_bid = market_order( short_order, market_idx, order_rec, order_rec.balance, market_idx.order_price );
+
+          // Initialize the market transaction
+          market_transaction mtrx;
+          mtrx.bid_owner = _current_bid->get_owner();
+          mtrx.bid_type = short_order;
+
+          cancel_current_short( mtrx, market_idx.order_price.quote_asset_id );
+          push_market_transaction( mtrx );
+      }
+
+      _pending_state->apply_changes();
+  }
+
   bool market_engine_v7::execute( asset_id_type quote_id, asset_id_type base_id, const fc::time_point_sec timestamp )
   {
       try