交易接收方回滚(rollbackRecv)
该方法用于在跨链资产交换接收方所属区块链上执行回滚操作,即还原接收方所属区块链上对应资产至跨链资产交换开始前的状态,并解锁该资产,使得其可以继续处理下一笔跨链操作。
本例中,该方法将根据接收方所属区块链上args[1]对应数据锁中的PreValue进行资产回滚,并删除该数据锁,使接收方所属区块链上args[1]对应的资产回滚至跨链资产交换开始前的状态。
![](https://support.huaweicloud.com/devg-tcs/public_sys-resources/note_3.0-zh-cn.png)
该方法为必选方法,需在智能合约中以相同命名定义该方法,否则将导致跨链资产交换失败。
/* * rollbackRecv is the rollback function for server side, it will be executed when error happened during the cross-chain tx process * In this example, this function will recover the balance of server side's local account and unlock it, * so that it can be used by next cross-chain tx * The example args[] is {"a","b","1","txid123"} * @Param args[0]: The name of the account on blockchain A that will transfer the amount of units to the account on blockchain B * @Param args[1]: The name of the account on blockchain B that will receive the amount of units from the account on blockchainA * @Param args[2]: The amount of unit that will be transferred from args[0](account on blockchain A) to args[1](account on blockchain B) * @Param args[3]: The id of this transaction that transfer units of one account to another account */ func (t *TCSExampleChaincode) rollbackRecv(stub shim.ChaincodeStubInterface, args []string) pb.Response { if len(args) != 3 { return shim.Error("Incorrect number of arguments. Expecting 3") } account := args[1] err := rollback(stub, txID, account) if err != nil { return shim.Error(err.Error()) } return shim.Success(nil) }