44 lines
1.0 KiB
Solidity
44 lines
1.0 KiB
Solidity
pragma solidity ^0.4.24;
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import "../math/SafeMath.sol";
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/**
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* @title PullPayment
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* @dev Base contract supporting async send for pull payments. Inherit from this
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* contract and use asyncSend instead of send or transfer.
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*/
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contract PullPayment {
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using SafeMath for uint256;
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mapping(address => uint256) public payments;
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uint256 public totalPayments;
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/**
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* @dev Withdraw accumulated balance, called by payee.
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*/
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function withdrawPayments() public {
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address payee = msg.sender;
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uint256 payment = payments[payee];
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require(payment != 0);
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require(address(this).balance >= payment);
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totalPayments = totalPayments.sub(payment);
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payments[payee] = 0;
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payee.transfer(payment);
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}
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/**
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* @dev Called by the payer to store the sent amount as credit to be pulled.
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* @param dest The destination address of the funds.
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* @param amount The amount to transfer.
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*/
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function asyncSend(address dest, uint256 amount) internal {
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payments[dest] = payments[dest].add(amount);
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totalPayments = totalPayments.add(amount);
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}
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}
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