Created
June 22, 2016 05:00
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| contract CircuitBreaker { | |
| struct Transfer { uint amount; address to; uint releaseBlock; bool released; bool stopped; } | |
| Transfer[] public transfers; | |
| address public curator; | |
| address public authorizedSender; | |
| uint public period; | |
| uint public limit; | |
| uint public currentPeriodEnd; | |
| uint public currentPeriodAmount; | |
| event PendingTransfer(uint id, uint amount, address to, uint releaseBlock); | |
| function CircuitBreaker(address _curator, address _authorizedSender, uint _period, uint _limit) { | |
| curator = _curator; | |
| period = _period; | |
| limit = _limit; | |
| authorizedSender = _authorizedSender; | |
| currentPeriodEnd = block.number + period; | |
| } | |
| function transfer(uint amount, address to) { | |
| if (msg.sender == authorizedSender) { | |
| updatePeriod(); | |
| if (currentPeriodAmount + amount > limit) { | |
| uint releaseBlock = block.number + period; | |
| PendingTransfer(transfers.length, amount, to, releaseBlock); | |
| transfers.push(Transfer(amount, to, releaseBlock, false, false)); | |
| } else { | |
| currentPeriodAmount += amount; | |
| transfers.push(Transfer(amount, to, block.number, true, false)); | |
| if(!to.send(amount)) throw; | |
| } | |
| } | |
| } | |
| function updatePeriod() { | |
| if (currentPeriodEnd < block.number) { | |
| currentPeriodEnd = block.number + period; | |
| currentPeriodAmount = 0; | |
| } | |
| } | |
| function releasePendingTransfer(uint id) { | |
| Transfer transfer = transfers[id]; | |
| if (transfer.releaseBlock <= block.number && !transfer.released && !transfer.stopped) { | |
| transfer.released = true; | |
| if(!transfer.to.send(transfer.amount)) throw; | |
| } | |
| } | |
| function stopTransfer(uint id) { | |
| if (msg.sender == curator) { | |
| transfers[id].stopped = true; | |
| } | |
| } | |
| } |
Why is updatePeriod() necessarily part of transfer()?
Because whether we can or cannot transfer funds depends on the periodical limit. If there's a new period we don't want to use previous period's currentPeriodAmount.
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Nice work. Why is
updatePeriod()necessarily part oftransfer()?