基于时间的押注契约:需要避免循环

Question

我们正在ethereum主干网上建立一份明智的合同。所有的赌注都需要附加一个时间戳，所以我们的逻辑依赖于时间。逻辑是在月底，每个涉众都将有信用，并且基于此，合同所有者将根据他们的creditsAmount将奖励给每个涉众。但是为了获得总creditsAmount，我们需要迭代stakeHolders的列表，这是非常昂贵的。这里有一个非常简短的例子，说明我们的赌注合同：

pragma solidity 0.8.6;
import “@openzeppelin/contracts/utils/structs/EnumerableSet.sol”;

contract Test {
  using EnumerableSet for EnumerableSet.AddressSet;

  struct Stake {
    uint256 lockedToken;
    uint256 creditsEarned; // numberOfDays * lockedToken = 15days * 1000 = 15000
  }
  
  // Rewards = RatioOfCreditsEarnedByStakeholder * MonthlyRewards

  EnumerableSet.AddressSet private stakeholders;
  mapping(address => Stake) private stakeholderToStake;

  function createStake(
   address stakeholder,
   uint256 lockedToken,
   uint256 creditsEarned
  ) public {
   stakeholders.add(stakeholder);
   stakeholderToStake[stakeholder] = Stake({
     lockedToken: lockedToken,
     creditsEarned: creditsEarned
   });
  }
      
function distributeRewards() public {
  uint256 totalCredits = 0;
  for (uint256 i = 0; i < stakeholders.length(); i++) {
    totalCredits += stakeholderToStake[stakeholders.at(i)].creditsEarned;
      }
    }
   }

因此，正如您可以想象的那样，最后一个循环非常昂贵，但我们目前还没有找到其他方法。对于如何避免这样的循环，你有什么想法吗？还是像我们一样依赖时间的其他赌博合同？

谢谢

Answer 1

为了扩展我的评论，我将这样做。

pragma solidity 0.8.6;
import “@openzeppelin/contracts/utils/structs/EnumerableSet.sol”;

contract Test {
using EnumerableSet for EnumerableSet.AddressSet;

struct Stake {
      uint256 lockedToken;
      uint256 creditsEarned;
   }
  
  // Rewards = RatioOfCreditsEarnedByStakeholder * MonthlyRewards

  EnumerableSet.AddressSet private stakeholders;
  mapping(address => Stake) private stakeholderToStake;
      
  uint256 private totalCredits;

  function createStake(
     address stakeholder,
     uint256 lockedToken,
     uint256 creditsEarned
  ) public {
      stakeholders.add(stakeholder);
      stakeholderToStake[stakeholder] = Stake({
      lockedToken: lockedToken,
      creditsEarned: creditsEarned
     });
    totalCredits += creditsEarned;
  }
      
  function distributeRewards() public {
  //do whatever you want with totalCredits here
   }