tornado-instances/contracts/InstanceAdditionProposal.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;
pragma abicoder v2;

import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";

import "./interfaces/IInstanceRegistry.sol";
import "./interfaces/IInstanceFactory.sol";

contract InstanceAdditionProposal {
  using SafeMath for uint256;

  IInstanceFactory public immutable instanceFactory;
  IInstanceRegistry public immutable instanceRegistry;

  struct InstanceAdditionData {
    address tokenAddress;
    uint40 smallDenomination;
    uint16 base10Exponent;
    uint24 uniPoolSwappingFee;
    uint16 protocolFee;
  }

  InstanceAdditionData[] public toAdd;

  event AddInstanceForRegistry(address instance, address token, uint256 denomination);

  constructor(address _instanceFactory, address _instanceRegistry, InstanceAdditionData[] memory _toAdd) {
    instanceFactory = IInstanceFactory(_instanceFactory);
    instanceRegistry = IInstanceRegistry(_instanceRegistry);

    // Copying structs is not implemented
    for (uint256 i = 0; i < _toAdd.length; i++) {
      toAdd.push(_toAdd[i]);
    }
  }

  function executeProposal() external {
    uint256 howMany = toAdd.length;

    for (uint256 i = 0; i < howMany; i++) {
      InstanceAdditionData memory data = toAdd[i];

      uint256 denomination = uint256(data.smallDenomination).mul(10 ** uint256(data.base10Exponent));

      address instance = instanceFactory.createInstanceClone(denomination, data.tokenAddress);

      IInstanceRegistry.Instance memory newInstanceData = IInstanceRegistry.Instance(
        data.tokenAddress != address(0),
        IERC20(data.tokenAddress),
        IInstanceRegistry.InstanceState.ENABLED,
        data.uniPoolSwappingFee,
        data.protocolFee
      );

      IInstanceRegistry.Tornado memory tornadoForUpdate = IInstanceRegistry.Tornado(instance, newInstanceData);

      instanceRegistry.updateInstance(tornadoForUpdate);

      emit AddInstanceForRegistry(address(instance), data.tokenAddress, denomination);
    }
  }
}