区块链实现简单的电商交易(以太坊)
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一、流程如下:
1、买家下单
2、卖家接单
3、买家付押金
4、卖家付押金
5、卖家发出货物
6、运输方甲收到货物
7、运输方甲送到货物
8、运输方乙收到货物
9、运输方乙送到货物
10、买家收到货物
二、将以上规则写入编译合约sol文件
/* This is a simple showcase smart contract example for trade finance / supply chain interactions. It could be improved in several ways: - add timeouts for state reversal (e.g. object is released by one party but not accepted by next) = add escrow payments also for carriers, otherwise they can block forever - add delivery dates for carriers, if not met their escrow balance will be punished - add insurance interface for, e.g. transport delay or damage insurance */ contract TradeHandler { address public seller; address public carrier1; address public carrier2; address public buyer; uint public purchasePrice; uint public carrier1Fee; uint public carrier2Fee; enum WaitingFor { BuyerEscrowPayment, SellerEscrowPayment, SellerRelease, Carrier1Accept, Carrier1Release, Carrier2Accept, Carrier2Release, BuyerAccept, Completed } WaitingFor state; // constructor sets all actors and fees function TradeHandler( address _seller, address _carrier1, address _carrier2, uint _carrier1Fee, uint _carrier2Fee, uint _purchasePrice) { buyer = msg.sender; seller = _seller; carrier1 = _carrier1; carrier2 = _carrier2; carrier1Fee = _carrier1Fee; carrier2Fee = _carrier2Fee; purchasePrice = _purchasePrice; } function reset( address _seller, address _carrier1, address _carrier2, uint _carrier1Fee, uint _carrier2Fee, uint _purchasePrice) { // only allow recylcing of contract if previous trade is completed if (state != WaitingFor.Completed) throw; buyer = msg.sender; seller = _seller; carrier1 = _carrier1; carrier2 = _carrier2; carrier1Fee = _carrier1Fee; carrier2Fee = _carrier2Fee; purchasePrice = _purchasePrice; } function () payable { // todo: one could check for timeouts and revert transitions if required // once trade is completed, do not allow further interaction if (state == WaitingFor.Completed) throw; // each actor is only responsible for their respective state transfer, reject all others if (msg.sender == buyer && state != WaitingFor.BuyerEscrowPayment && state != WaitingFor.BuyerAccept) throw; if (msg.sender == seller && state != WaitingFor.SellerEscrowPayment && state != WaitingFor.SellerRelease) throw; if (msg.sender == carrier1 && state != WaitingFor.Carrier1Accept && state != WaitingFor.Carrier1Release) throw; if (msg.sender == carrier2 && state != WaitingFor.Carrier2Accept && state != WaitingFor.Carrier2Release) throw; // make sure that the right amounts are being paid into this escrow contract by buyer and seller if (state == WaitingFor.BuyerEscrowPayment && msg.value != 2 * purchasePrice + carrier1Fee + carrier2Fee) throw; if (state == WaitingFor.SellerEscrowPayment && msg.value != purchasePrice) throw; // perform state transitions if (state == WaitingFor.BuyerEscrowPayment) state = WaitingFor.SellerEscrowPayment; else if (state == WaitingFor.SellerEscrowPayment) state = WaitingFor.SellerRelease; else if (state == WaitingFor.SellerRelease) state = WaitingFor.Carrier1Accept; else if (state == WaitingFor.Carrier1Accept) state = WaitingFor.Carrier1Release; else if (state == WaitingFor.Carrier1Release) state = WaitingFor.Carrier2Accept; else if (state == WaitingFor.Carrier2Accept) { state = WaitingFor.Carrier2Release; carrier1.send(carrier1Fee); } else if (state == WaitingFor.Carrier2Release) state = WaitingFor.BuyerAccept; else if (state == WaitingFor.BuyerAccept) { state = WaitingFor.Completed; carrier2.send(carrier2Fee); seller.send(2 * purchasePrice); buyer.send(purchasePrice); } } }
注:以上需要转换成新版的sol文件
三、操作:
如下图所示:
参考:https://github.com/validitylabs/TradeManager
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