如何获取交易结果和状态

Question

我正在尝试使用以太坊区块链和 Solidity 合约。我目前正在部署合约并对其执行一些操作，但我想知道如何获取特定交易的一些“反馈/回调/返回”。

例如，有没有办法将事务的状态设置为 0（错误）并仍然获取事件？

if (id.length <= 0) {

    emit Result("KO", "1");

    revert();

} 

这不起作用（无事件），因为我恢复了所有内容，但状态将设置为 0

if (id.length <= 0) {

    emit Result("KO", "1");

    return;

} 

我会收到一些事件，但状态将保持 1

if (id.length <= 0) {

    revert("KO_1");

} 

状态将为0，但我不会有任何事件

这是我执行该操作的代码：

func    testFunction(id []byte) {

    //...

    //...

    tx, err := instance.Action(opt, id)

    if (errors.HasError(err)) {

        return

    }

    callbackValue := subscribeToContract(tx.Hash().Hex())

    logs.Pretty(tx, callbackValue)

    //...

    //...

}

func    subscribeToContract(hashToRead string) myStruct {

    query := ethereum.FilterQuery{

        Addresses: []common.Address{address},

    }

    soc := make(chan types.Log)

    sub, err := WssClient.SubscribeFilterLogs(context.Background(), query, soc)

    if err != nil {

        logs.Error(err)

    }

    for {

        select {

        case err := <-sub.Err():

            logs.Info(`SOMETHING ERROR`)

            logs.Error(err)

        case vLog := <-soc:

        logs.Info(`SOMETHING`)

        contractAbi, _ := abi.JSON(strings.NewReader(string(SignABI)))  

        event := myStruct{}

    contractAbi.Unpack(&event, "Result", vLog.Data)

    logs.Info(`New Event from [` + vLog.TxHash.Hex() + `] : ` + event.Message)

        }

    }

}

如果id.length > 0，一切都好。但如果id.length <= 0，我没有来自该subscribeToContract函数的回调。

有没有办法直接获得结果状态，或者应该循环tx, err := client.TransactionReceipt(context.Background(), txHash)直到获得状态？

Answer 1

我没有找到任何方法来订阅事务的特定状态更改，但有一个解决方法：该go-ethereum包提供了 2 个函数SubscribeFilterLogs和SubscribeNewHead.&nbsp;我们可以使用第一个来获取日志（如果相关），第二个来获取块信息：SubscribeNewHead 订阅有关给定通道上当前区块链头的通知。当开采区块时，可以验证或拒绝/恢复交易，因此我们可以使用这个“技巧”func checkTransactionReceipt(_txHash string) int {&nbsp; &nbsp; client, _ := getClient("https://ropsten.infura.io/v3/XXXXXX")&nbsp; &nbsp; txHash := common.HexToHash(_txHash)&nbsp; &nbsp; tx, err := client.TransactionReceipt(context.Background(), txHash)&nbsp; &nbsp; if (Error.HasError(err)) {&nbsp; &nbsp; &nbsp; &nbsp; return (-1)&nbsp; &nbsp; }&nbsp; &nbsp; return (int(tx.Status))}func&nbsp; &nbsp; WaitForBlockCompletation(data EthData, hashToRead string) int {&nbsp; &nbsp; soc := make(chan *types.Header)&nbsp; &nbsp; sub, err := data.WssClient.SubscribeNewHead(context.Background(), soc)&nbsp; &nbsp; if (err != nil) {&nbsp; &nbsp; &nbsp; &nbsp; return -1&nbsp; &nbsp; }&nbsp; &nbsp; for {&nbsp; &nbsp; &nbsp; &nbsp; select {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case err := <-sub.Err():&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; _ = err&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return -1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case header := <-soc:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; logs.Info(header.TxHash.Hex())&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; transactionStatus := checkTransactionReceipt(hashToRead)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (transactionStatus == 0) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //FAILURE&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sub.Unsubscribe()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } else if (transactionStatus == 1) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //SUCCESS&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sub.Unsubscribe()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return 1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}基本上我们正在等待区块被开采，然后如果交易尚未验证/拒绝，我们会检查TransactionReceipt失败并出现错误（ ）。not found然后，如果有交易，我们可以取消订阅并返回交易状态（0失败，1成功）。不确定这是否是最差、最好、唯一的方法，但它确实有效！请随意改进此解决方案！

Answer 2

更简单/更新的解决方案：我认为waitMined函数就是您正在寻找的函数。bind.WaitMined(context.Background(), client, signedTx)