90 lines
3.0 KiB
Solidity
90 lines
3.0 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity 0.8.19;
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import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
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import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
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import {IRewardDistributor} from "./interfaces/IRewardDistributor.sol";
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import {IRewardTracker} from "./interfaces/IRewardTracker.sol";
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import {Governable} from "../core/Governable.sol";
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contract RewardDistributor is IRewardDistributor, ReentrancyGuard, Governable {
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using SafeERC20 for IERC20;
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address public override rewardToken;
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// 1个token, 在指定周期内, 每秒可获得的收益
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// 比如收益是150%, 周期是1年, 那么 1.5 / (365 * 24 * 3600)
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uint256 public override tokensPerInterval;
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uint256 public lastDistributionTime;
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// RewardTracker合约地址
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address public rewardTracker;
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address public admin;
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event Distribute(uint256 amount);
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event TokensPerIntervalChange(uint256 amount);
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modifier onlyAdmin() {
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require(msg.sender == admin, "RewardDistributor: forbidden");
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_;
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}
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constructor(address _rewardToken, address _rewardTracker) {
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rewardToken = _rewardToken;
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rewardTracker = _rewardTracker;
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admin = msg.sender;
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}
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function setAdmin(address _admin) external onlyGov {
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admin = _admin;
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}
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// to help users who accidentally send their tokens to this contract
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function withdrawToken(address _token, address _account, uint256 _amount) external onlyGov {
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IERC20(_token).safeTransfer(_account, _amount);
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}
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function updateLastDistributionTime() external onlyAdmin {
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lastDistributionTime = block.timestamp;
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}
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function setTokensPerInterval(uint256 _amount) external onlyAdmin {
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require(lastDistributionTime != 0, "RewardDistributor: invalid lastDistributionTime");
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IRewardTracker(rewardTracker).updateRewards();
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tokensPerInterval = _amount;
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emit TokensPerIntervalChange(_amount);
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}
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function pendingRewards() public view override returns (uint256) {
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if (block.timestamp == lastDistributionTime) {
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return 0;
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}
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uint256 timeDiff = block.timestamp - lastDistributionTime;
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return tokensPerInterval * timeDiff;
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}
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// changed
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// 从RewardTracker合约中调用
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// 由于我们是每个用户单独计算收益, 所以这里需要传入具体数量, 用于计算需要transafer的数量
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function distribute(uint256 _amount, uint256 _decimals) external override returns (uint256) {
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require(msg.sender == rewardTracker, "RewardDistributor: invalid msg.sender");
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uint256 amount = pendingRewards();
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if (amount == 0) {
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return 0;
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}
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lastDistributionTime = block.timestamp;
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uint256 tokenAmount = amount * _amount / (10**_decimals);
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uint256 balance = IERC20(rewardToken).balanceOf(address(this));
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require(tokenAmount >= balance, "RewardDistributor: insufficient balance");
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IERC20(rewardToken).safeTransfer(msg.sender, tokenAmount);
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emit Distribute(tokenAmount);
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return amount;
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}
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}
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