40 lines
797 B
Solidity
40 lines
797 B
Solidity
pragma solidity ^0.4.8;
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import '../SafeMath.sol';
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/*
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* PullPayment
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* Base contract supporting async send for pull payments.
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* Inherit from this contract and use asyncSend instead of send.
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*/
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contract PullPayment is SafeMath {
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mapping(address => uint) public payments;
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// store sent amount as credit to be pulled, called by payer
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function asyncSend(address dest, uint amount) internal {
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payments[dest] = safeAdd(payments[dest], amount);
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}
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// withdraw accumulated balance, called by payee
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function withdrawPayments() {
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address payee = msg.sender;
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uint payment = payments[payee];
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if (payment == 0) {
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throw;
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}
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if (this.balance < payment) {
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throw;
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}
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payments[payee] = 0;
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if (!payee.send(payment)) {
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throw;
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}
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}
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}
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