127 lines
5.1 KiB
Solidity
127 lines
5.1 KiB
Solidity
pragma solidity 0.6.12;
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import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
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import "@openzeppelin/contracts/math/SafeMath.sol";
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import "@openzeppelin/contracts/access/Ownable.sol";
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import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
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import "./DioneToken.sol";
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// DioneStaking is the main contract for Dione oracle network Proof-of-Stake mechanism
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//
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// Note that it's ownable and the owner has power over changing miner rewards and minimum DIONE stake
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// The ownership of the contract would be transfered to 24 hours Timelock
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contract DioneStaking is Ownable, ReentrancyGuard {
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using SafeMath for uint256;
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using SafeERC20 for IERC20;
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// MinerInfo contains total DIONEs staked by miner, how much tasks been already computed
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// and timestamp of first deposit
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struct MinerInfo {
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uint256 amount; // How many DIONE tokens was staked by the miner.
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uint256 firstStakeBlock; // First block for miner DIONE tokens reward.
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uint256 lastRewardBlock; // Last block for miner DIONE tokens reward
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}
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DioneToken public dione;
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// Agregator contract address.
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address public aggregatorAddr;
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// Miner rewards in DIONE tokens.
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uint256 public minerReward;
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// The block number when DIONE mining starts.
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uint256 public startBlock;
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// Minimum amount of staked DIONE tokens required to start mining
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uint256 public minimumStake;
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// Total amount of DIONE tokens staked
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uint256 private _totalStake;
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// Info of each miner that stakes DIONE tokens.
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mapping (address => MinerInfo) public minerInfo;
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event Stake(address indexed miner, uint256 amount);
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event Withdraw(address indexed miner, uint256 amount);
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event Mine(address indexed miner, uint256 blockNumber);
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constructor(
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DioneToken _dione,
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address _aggregatorAddr,
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uint256 _minerReward,
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uint256 _startBlock,
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uint256 _minimumStake;
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) public {
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dione = _dione;
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aggregatorAddr = _aggregatorAddr;
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minerReward = _minerReward;
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startBlock = _startBlock;
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minimumStake = _minimumStake;
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}
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// Mine new dione oracle task, only can be executed by aggregator contract
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function mine(address _minerAddr) public nonReentrant {
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require(msg.sender == aggregatorAddr, "not aggregator contract");
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MinerInfo storage miner = minerInfo[_minerAddr];
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require(miner.amount >= minimumStake)
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dione.mint(_minerAddr, minerReward);
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miner.lastRewardBlock = block.number;
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emit Mine(_minerAddr, block.number)
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}
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// Mine new dione oracle task and stake miner reward, only can be executed by aggregator contract
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function mineAndStake(address _minerAddr) public nonReentrant {
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require(msg.sender == aggregatorAddr, "not aggregator contract");
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MinerInfo storage miner = minerInfo[_minerAddr];
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require(miner.amount >= minimumStake)
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dione.mint(address(this), minerReward);
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_totalStake = _totalStake.add(minerReward);
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miner.amount = miner.amount.add(minerReward);
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miner.lastRewardBlock = block.number;
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emit Mine(_minerAddr, block.number)
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}
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// Deposit DIONE tokens to mine on dione network
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function stake(uint256 _amount) public nonReentrant {
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require(_amount > 0, "Cannot stake 0");
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MinerInfo storage miner = minerInfo[msg.sender];
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_totalStake = _totalStake.add(amount);
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miner.amount = miner.amount.add(_amount);
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dione.safeTransferFrom(address(msg.sender), address(this), _amount);
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if (miner.firstStakeBlock == 0 && miner.amount >= minimumStake) {
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miner.firstStakeBlock = block.number > startBlock ? block.number : startBlock;
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}
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emit Stake(msg.sender, _amount);
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}
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// Withdraw DIONE tokens from DioneStaking
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function withdraw(uint256 _amount) public nonReentrant {
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MinerInfo storage miner = minerInfo[msg.sender];
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require(miner.amount >= _amount, "withdraw: not enough tokens");
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if(_amount > 0) {
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_totalStake = _totalStake.sub(amount);
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miner.amount = miner.amount.sub(_amount);
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dione.safeTransfer(address(msg.sender), _amount);
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}
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emit Withdraw(msg.sender, _amount);
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}
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// Returns total amount of DIONE tokens in PoS mining
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function totalStake() external view returns (uint256) {
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return _totalStake;
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}
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function minerStake(address _minerAddr) external view returns (uint256) {
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MinerInfo storage miner = minerInfo[_minerAddr];
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return miner.amount
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}
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// Update miner reward in DIONE tokens, only can be executed by owner of the contract
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function setMinerReward(uint256 _minerReward) public onlyOwner {
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require(_minerReward > 0, "!minerReward-0");
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minerReward = _minerReward;
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}
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// Update minimum stake in DIONE tokens for miners, only can be executed by owner of the contract
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function setMinimumStake(uint256 _minimumStake) public onlyOwner {
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require(_minimumStake > 0, "!minerReward-0");
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minimumStake = _minimumStake;
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}
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} |