solidity/test/compilationTests/zeppelin/payment/PullPayment.sol
2018-07-04 19:20:51 +02:00

51 lines
1.1 KiB
Solidity

pragma solidity ^0.4.11;
import '../math/SafeMath.sol';
/**
* @title PullPayment
* @dev Base contract supporting async send for pull payments. Inherit from this
* contract and use asyncSend instead of send.
*/
contract PullPayment {
using SafeMath for uint256;
mapping(address => uint256) public payments;
uint256 public totalPayments;
/**
* @dev Called by the payer to store the sent amount as credit to be pulled.
* @param dest The destination address of the funds.
* @param amount The amount to transfer.
*/
function asyncSend(address dest, uint256 amount) internal {
payments[dest] = payments[dest].add(amount);
totalPayments = totalPayments.add(amount);
}
/**
* @dev withdraw accumulated balance, called by payee.
*/
function withdrawPayments() public {
address payee = msg.sender;
uint256 payment = payments[payee];
if (payment == 0) {
throw;
}
if (this.balance < payment) {
throw;
}
totalPayments = totalPayments.sub(payment);
payments[payee] = 0;
if (!payee.send(payment)) {
throw;
}
}
}