PriceCommon.hpp

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#pragma once
 
#include <tvm/suffixes.hpp>
 
#include "RationalValue.hpp"
 
namespace tvm {
 
struct OrderRet {
  uint32  err_code;       
  uint128 processed;      
  uint128 enqueued;       
  uint128 price_num;      
  uint128 price_denum;    
  uint256 user_id;        
  uint256 order_id;       
  address pair;           
  uint8   major_decimals; 
  uint8   minor_decimals; 
  bool    sell;           
};
 
__interface IPriceCallback {
  [[internal, noaccept]]
  void onOrderFinished(
    OrderRet ret 
  ) = 300;
};
using IPriceCallbackPtr = handle<IPriceCallback>;
 
static constexpr price_t taker_fee = { 15u128, 10000u128 }; 
static constexpr price_t maker_vig = {  3u128, 10000u128 }; 
 
static_assert(taker_fee.denum == maker_vig.denum, "Inconsistent taker fee / maker vig denominators");
static_assert(taker_fee.num > maker_vig.num, "Inconsistent taker fee / maker vig numerators");
 
__always_inline
uint128 calc_lend_tokens_for_order(bool sell, uint128 major_tokens, price_t price) {
  auto tokens = sell ? major_tokens : (major_tokens * price);
  return tokens + tokens * taker_fee;
}
 
} // namespace tvm