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| // // SPDX-License-Identifier: GPL-3.0 | ||
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| // pragma solidity ^0.8.19; | ||
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| // import { IERC20 } from "oz/interfaces/IERC20.sol"; | ||
| // import { SafeERC20 } from "oz/token/ERC20/utils/SafeERC20.sol"; | ||
| // import { SafeCast } from "oz/utils/math/SafeCast.sol"; | ||
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| // import { ITransmuter } from "interfaces/ITransmuter.sol"; | ||
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| // import { AccessControl, IAccessControlManager } from "../utils/AccessControl.sol"; | ||
| // import "../utils/Constants.sol"; | ||
| // import "../utils/Errors.sol"; | ||
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| // import { RebalancerFlashloan } from "./RebalancerFlashloan.sol"; | ||
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| // /// @title Rebalancer | ||
| // /// @author Angle Labs, Inc. | ||
| // /// @notice Contract built to subsidize rebalances between collateral tokens | ||
| // /// @dev This contract is meant to "wrap" the Transmuter contract and provide a way for governance to | ||
| // /// subsidize rebalances between collateral tokens. Rebalances are done through 2 swaps collateral <> agToken. | ||
| // /// @dev This contract is not meant to hold any transient funds aside from the rebalancing budget | ||
| // contract Harvester is AccessControl { | ||
| // using SafeERC20 for IERC20; | ||
| // using SafeCast for uint256; | ||
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| // /// @notice Reference to the `transmuter` implementation this contract aims at rebalancing | ||
| // ITransmuter public immutable TRANSMUTER; | ||
| // /// @notice AgToken handled by the `transmuter` of interest | ||
| // RebalancerFlashloan public rebalancer; | ||
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| // address public collateral; | ||
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| // address public vault; | ||
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| // uint64 public maxExposureYieldAsset; | ||
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| // uint64 public minExposureYieldAsset; | ||
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| // uint64 public targetExposureLiquid; | ||
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| // uint64 public maxSlippage; | ||
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| // /*////////////////////////////////////////////////////////////////////////////////////////////////////////////////// | ||
| // INITIALIZATION | ||
| // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////*/ | ||
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| // /// @notice Initializes the immutable variables of the contract: `accessControlManager`, `transmuter` and `agToken` | ||
| // constructor(RebalancerFlashloan _rebalancer, address _collateral, address _vault) { | ||
| // ITransmuter _transmuter = _rebalancer.TRANSMUTER(); | ||
| // TRANSMUTER = _transmuter; | ||
| // rebalancer = _rebalancer; | ||
| // accessControlManager = IAccessControlManager(_transmuter.accessControlManager()); | ||
| // vault = _vault; | ||
| // collateral = _collateral; | ||
| // _getLimitExposuresYieldAsset(); | ||
| // } | ||
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| // // Due to potential transaction fees, multiple harvests may be needed to arrive at the target exposure | ||
| // function harvest() external { | ||
| // (uint256 stablecoinsFromCollateral, uint256 stablecoinsIssued) = TRANSMUTER.getIssuedByCollateral(collateral); | ||
| // (uint256 stablecoinsFromVault, ) = TRANSMUTER.getIssuedByCollateral(vault); | ||
| // uint8 increase; | ||
| // uint256 amount; | ||
| // if (stablecoinsFromCollateral * 1e9 > targetExposureLiquid * stablecoinsIssued) { | ||
| // // Need to increase exposure to yield bearing asset | ||
| // increase = 1; | ||
| // amount = stablecoinsFromCollateral - (targetExposureLiquid * stablecoinsIssued) / 1e9; | ||
| // if (stablecoinsFromVault + amount > (maxExposureYieldAsset * stablecoinsIssued) / 1e9) { | ||
| // amount = maxExposureYieldAsset * stablecoinsIssued - stablecoinsFromVault / 1e9; | ||
| // } | ||
| // } else { | ||
| // amount = targetExposureLiquid * stablecoinsIssued - stablecoinsFromCollateral / 1e9; | ||
| // if (amount >= stablecoinsFromVault) amount = stablecoinsFromVault; | ||
| // if (stablecoinsFromVault - amount < (minExposureYieldAsset * stablecoinsIssued) / 1e9) { | ||
| // amount = stablecoinsFromVault - (minExposureYieldAsset * stablecoinsIssued) / 1e9; | ||
| // } | ||
| // } | ||
| // TRANSMUTER.updateOracle(vault); | ||
| // rebalancer.adjustYieldExposure(amount, increase, collateral, vault, (amount * (1e9 - maxSlippage)) / 1e9); | ||
| // } | ||
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| // function setRebalancer(address _newRebalancer) external onlyGuardian { | ||
| // rebalancer = _newRebalancer; | ||
| // // Assumption is done that being built on the same Transmuter contract | ||
| // } | ||
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| // function setTargetExposure(uint64 _targetExposure) external onlyGuardian { | ||
| // targetExposureLiquid = _targetExposure; | ||
| // } | ||
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| // function setMaxSlippage(uint64 _maxSlippage) external onlyGuardian { | ||
| // maxSlippage = _maxSlippage; | ||
| // } | ||
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| // function getLimitExposuresYieldAsset() external { | ||
| // _getLimitExposuresYieldAsset(); | ||
| // } | ||
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| // function _getLimitExposuresYieldAsset() internal { | ||
| // uint64[] memory xFeeMint; | ||
| // (xFeeMint, ) = TRANSMUTER.getCollateralMintFees(vault); | ||
| // uint256 length = xFeeMint.length; | ||
| // if (length <= 1) maxExposureYieldAsset = 1e9; | ||
| // else maxExposureYieldAsset = xFeeMint[length - 2]; | ||
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| // uint64[] memory xFeeBurn; | ||
| // (xFeeBurn, ) = TRANSMUTER.getCollateralBurnFees(vault); | ||
| // length = xFeeBurn.length; | ||
| // if (length <= 1) minExposureYieldAsset = 0; | ||
| // else minExposureYieldAsset = xFeeBurn[length - 2]; | ||
| // } | ||
| // } |
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