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109 lines
3.1 KiB
109 lines
3.1 KiB
pragma solidity >=0.4.22;
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contract StakeLockContract {
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/**
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* @dev Error messages for require statements
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*/
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string internal constant ALREADY_LOCKED = 'Tokens already locked';
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string internal constant NOT_LOCKED = 'No tokens locked';
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string internal constant AMOUNT_ZERO = 'Amount can not be 0';
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uint256 internal constant LOCK_PERIOD_IN_EPOCHS = 3; // Final locking period TBD.
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uint256 internal numBlocksPerEpoch = 5; // This value is for testing only
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/**
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* @dev locked token structure
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*/
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struct lockedToken {
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uint256 _amount;
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uint256 _blockNum;
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uint256 _epochNum;
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uint256 _continueCount;
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}
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/**
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* @dev Holds number & validity of tokens locked for a given reason for
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* a specified address
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*/
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mapping(address => lockedToken) private locked;
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mapping(address => uint) private indices;
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address[] private accountList;
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event Locked(address indexed _of, uint _amount, uint256 _epoch);
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event Unlocked(address indexed account, uint index);
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/**
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* @dev Returns total tokens held by an address (locked + transferable)
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* @param _of The address to query the total balance of
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*/
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function lockedBalanceOf(address _of)
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public
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view
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returns (uint256 amount)
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{
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amount = locked[_of]._amount;
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}
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/**
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* @dev Locks a specified amount of tokens against an address
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* starting at the specific epoch
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* @param _epoch The epoch where the lock happens
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*/
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function lock(uint256 _epoch)
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public
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payable
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returns (bool)
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{
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// If tokens are already locked, then functions extendLock or
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// increaseLockAmount should be used to make any changes
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require(lockedBalanceOf(msg.sender) == 0, ALREADY_LOCKED);
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require(msg.value != 0, AMOUNT_ZERO);
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locked[msg.sender] = lockedToken(msg.value, block.number, currentEpoch(), 1);
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emit Locked(msg.sender, msg.value, _epoch);
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return true;
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}
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/**
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* @dev Unlocks the unlockable tokens of a specified address
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* @param _requestor Address of user, claiming back unlockable tokens
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*/
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function unlock(address payable _requestor)
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public
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returns (uint256 unlockableTokens)
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{
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unlockableTokens = getUnlockableTokens(_requestor);
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if (unlockableTokens != 0) {
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_requestor.transfer(unlockableTokens);
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}
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}
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/**
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* @dev Gets the unlockable tokens of a specified address
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* @param _of The address to query the the unlockable token count of
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*/
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function getUnlockableTokens(address _of)
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public
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view
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returns (uint256 unlockableTokens)
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{
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uint256 currentEpoch = currentEpoch();
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if (locked[_of]._epochNum + locked[_of]._continueCount * LOCK_PERIOD_IN_EPOCHS < currentEpoch) {
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unlockableTokens = locked[_of]._amount;
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}
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}
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/**
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* @dev Gets the epoch number of the specified block number.
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*/
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function currentEpoch()
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public
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view
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returns (uint256)
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{
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return block.number / numBlocksPerEpoch;
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}
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}
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