Nethereum.Unity 库是一个特定于 NETHereum 的 Unity 库和 API，它支持 UnityWebRequest 使用 RPC over Http 与 Ethereum 交互。Nethereum.Unity 库是唯一支持在 Unity 中使用协程时使用 IEnumerator 和 yield 的库。
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1、Nethereum.Unity简介
如果想在 net461 / netstandard 中使用 async / await 和 Tasks，只要你的环境不需要使用 UnityWebRequest 而不是 HttpRequest，也可以使用与“vanilla” Nethereum 相同的方式。 （Webgl 需要使用 UnityWebRequest）
Nethereum 还为 net351 和 net461 框架构建提供了 AoT 库。 所有“dll”都可以从 Nethereum github 下载。
flappy eth 是 Unity3d 的“flappy”示例，使用 Nethereum 作为 webgl dapp 游戏转换为 与 Ethereum、Infura 和 Metamask 交互。主要集成组件的源代码可以在这里找到, 你也可以在这里尝试游戏。
2、Unity3dSimpleSample示例简介
Unity3dSimpleSample是使用 Net472（现在从 Net461 升级）进行 Unity3d 开发的简单示例，使用的 Unity 版本是 2020.3.15f LTS。 示例中包含资产文件夹中的所有 DLL，你可能不需要其中一些代码，直接删除它们（如 Besu、Geth、HdWallet、NBitcoin 等）就可以了，具体 取决于你的需要。
示例代码演示了如何使用Nethereum.Unity实现以下功能：
- 在异步和协程中使用 Unity.UI 将当前 BlockNumber 输出到日志
- 使用 Unity.UI 和协程进行以太传输
- ETH转账时使用 1559 Suggestion 策略或 Legacy 模式
- 智能合约部署（ERC20）、交易（Transfer）和查询（Balance）
注意：
WebGL 仅支持协程 UnityWebRequest。如果构建 WebGL版本发生问题，请取消选中 Development Build。为了支持 WebGL 和 AOT，此示例使用 Net472AOT dll 和自定义 Json.Net Unity请记住删除 Nethereum 发布包的 System.HttpClient 和 UnityEngine
下面是桌面版的截图：
下面是WebGL版的截图：
要运行本地区块链，可以使用预配置的测试链。
3、异步查询区块号 — 非协程方式
下面的代码展示了如何用Nethereum.Unity异步查询区块号：
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using Nethereum.ABI.FunctionEncoding.Attributes;
using UnityEngine;
using UnityEngine.UI;
using Nethereum.Contracts;
using Nethereum.Web3;
public class GetLatestBlockVanillaNethereum : MonoBehaviour {
private static bool TrustCertificate(object sender, X509Certificate x509Certificate, X509Chain x509Chain, SslPolicyErrors sslPolicyErrors)
{
// all certificates are accepted
return true;
}
public string Url = "https://mainnet.infura.io";
public InputField ResultBlockNumber;
public InputField InputUrl;
// Use this for initialization
void Start()
{
InputUrl.text = Url;
}
public async void GetBlockNumber()
{
Url = InputUrl.text;
//This is to workaround issue with certificates https://forum.unity.com/threads/how-to-allow-self-signed-certificate.522183/
//Uncomment if needed
// ServicePointManager.ServerCertificateValidationCallback = TrustCertificate;
var web3 = new Web3(Url);
var blockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();
ResultBlockNumber.text = blockNumber.Value.ToString();
}
}
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4、异步查询区块号 — 协程方式
下面的代码展示了如何用Nethereum.Unity以协程方式异步查询区块号：
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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Nethereum.JsonRpc.UnityClient;
using Nethereum.RPC.Eth.DTOs;
using Nethereum.Util;
public class GetLatestBlockCoroutine : MonoBehaviour
{
public string Url = "https://mainnet.infura.io";
public InputField ResultBlockNumber;
public InputField InputUrl;
// Use this for initialization
void Start()
{
InputUrl.text = Url;
}
public void GetBlockNumberRequest()
{
StartCoroutine(GetBlockNumber());
}
public IEnumerator GetBlockNumber()
{
Url = InputUrl.text;
var blockNumberRequest = new EthBlockNumberUnityRequest(Url);
yield return blockNumberRequest.SendRequest();
ResultBlockNumber.text = blockNumberRequest.Result.Value.ToString();
}
}
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5、ETH转账的简单实现
为了支持ETH转账， Nethereum 提供了一个特定的 Unity 请求，EthTransferUnityRequest.
EthTransferUnityRequest 使用我们的以太坊客户端的“url”、能够签署交易的私钥和我们的帐户 地址（与私钥相同）进行实例化。
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var url = " http://localhost:8545 " ;
var privateKey = " 0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7 " ;
var ethTransfer = new EthTransferUnityRequest ( url , privateKey , " YOURCHAINID " );
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一旦我们的请求被实例化，就可以使用传统模式启动传输，下面的代码设置 2 Gwei 作为gas价格:
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var receivingAddress = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";
yield return ethTransfer.TransferEther(receivingAddress, 1.1m, 2);
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在这里，我们指定了接收地址、发送量和可选的 gas 价格。该请求将自动将 gas 价格转换为 Wei。
我们可以在之后验证是否有任何异常，如下所示：
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if (ethTransfer.Exception != null)
{
Debug.Log(ethTransfer.Exception.Message);
yield break;
}
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如果没有发生错误，我们可以每 2 秒从请求和轮询中检索交易哈希以等待交易确认：
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var transactionHash = ethTransfer.Result;
//create a poll to get the receipt when mined
var transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
//checking every 2 seconds for the receipt
yield return transactionReceiptPolling.PollForReceipt(transactionHash, 2);
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最后，我们可以使用EthGetBalanceUnityRequest检查收款账户的余额。请注意，我们在执行 请求时声明想要最新块记录的余额。
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var balanceRequest = new EthGetBalanceUnityRequest(url);
yield return balanceRequest.SendRequest(receivingAddress, BlockParameter.CreateLatest());
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可以使用默认的 Wei UnitConvertor 将 Wei 中的结果转换为 Eth：
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Debug.Log("Balance of account:" UnitConversion.Convert.FromWei(balanceRequest.Result.Value));
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6、EIP 1559 使用建议
以下是使用协程、TimePreference、MedianFeeHistory 或 LegacyMode 提供的费用建议策略以使用 旧模式或与其他链一起使用的一些示例。
要使用 LegacyMode，你必须提供 GasPrice，或者可以通过设置UseLegacyAsDefault为 true 来强制 LegacyMode：
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if (feeStrategy == FeeStrategy.TimePreference)
{
Debug.Log("Time Preference");
var timePreferenceFeeSuggestion = new TimePreferenceFeeSuggestionUnityRequestStrategy(Url);
yield return timePreferenceFeeSuggestion.SuggestFees();
if (timePreferenceFeeSuggestion.Exception != null)
{
Debug.Log(timePreferenceFeeSuggestion.Exception.Message);
yield break;
}
//lets get the first one so it is higher priority
Debug.Log(timePreferenceFeeSuggestion.Result.Length);
if (timePreferenceFeeSuggestion.Result.Length > 0)
{
Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxFeePerGas);
Debug.Log(timePreferenceFeeSuggestion.Result[0].MaxPriorityFeePerGas);
}
var fee = timePreferenceFeeSuggestion.Result[0];
yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
if (ethTransfer.Exception != null)
{
Debug.Log(ethTransfer.Exception.Message);
yield break;
}
}
if(feeStrategy == FeeStrategy.MedianFeeHistory)
{
Debug.Log("MedianFeeHistory mode");
var medianPriorityFeeStrategy = new MedianPriorityFeeHistorySuggestionUnityRequestStrategy(Url);
yield return medianPriorityFeeStrategy.SuggestFee();
if (medianPriorityFeeStrategy.Exception != null)
{
Debug.Log(medianPriorityFeeStrategy.Exception.Message);
yield break;
}
Debug.Log(medianPriorityFeeStrategy.Result.MaxFeePerGas);
Debug.Log(medianPriorityFeeStrategy.Result.MaxPriorityFeePerGas);
var fee = medianPriorityFeeStrategy.Result;
yield return ethTransfer.TransferEther(receivingAddress, Amount, fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);
if (ethTransfer.Exception != null)
{
Debug.Log(ethTransfer.Exception.Message);
yield break;
}
}
if (feeStrategy == FeeStrategy.Legacy)
{
Debug.Log("Legacy mode");
//I am forcing the legacy mode but also I am including the gas price
ethTransfer.UseLegacyAsDefault = true;
yield return ethTransfer.TransferEther(receivingAddress, Amount, GasPriceGwei);
if (ethTransfer.Exception != null)
{
Debug.Log(ethTransfer.Exception.Message);
yield break;
}
}
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7、智能合约定义声明
在游戏中实现智能合约支持的第一步是包含我们的智能合约定义，这可以是使用 vscode solidity 扩展 或控制台代码生成工具生成的代码：
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//Deployment contract object definition
public partial class EIP20Deployment : EIP20DeploymentBase
{
public EIP20Deployment() : base(byteCODE) { }
public EIP20Deployment(string byteCode) : base(byteCode) { }
}
public class EIP20DeploymentBase : ContractDeploymentMessage
{
public static string BYTECODE = "608060405234801561001057600080fd5b506040516107843803806107848339810160409081528151602080840151838501516060860151336000908152808552959095208490556002849055908501805193959094919391019161006991600391860190610096565b506004805460ff191660ff8416179055805161008c906005906020840190610096565b5050505050610131565b828054600181600116156101000203166002900490600052602060002090601f016020900481019282601f106100d757805160ff1916838001178555610104565b82800160010185558215610104579182015b828111156101045782518255916020019190600101906100e9565b50610110929150610114565b5090565b61012e91905b80821115610110576000815560010161011a565b90565b610644806101406000396000f3006080604052600436106100ae5763ffffffff7c010000000000000000000000000000000000000000000000000000000060003504166306fdde0381146100b3578063095ea7b31461013d57806318160ddd1461017557806323b872dd1461019c57806327e235e3146101c6578063313ce567146101e75780635c6581651461021257806370a082311461023957806395d89b411461025a578063a9059cbb1461026f578063dd62ed3e14610293575b600080fd5b3480156100bf57600080fd5b506100c86102ba565b6040805160208082528351818301528351919283929083019185019080838360005b838110156101025781810151838201526020016100ea565b50505050905090810190601f16801561012f5780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b34801561014957600080fd5b50610161600160a060020a0360043516602435610348565b604080519115158252519081900360200190f35b34801561018157600080fd5b5061018a6103ae565b60408051918252519081900360200190f35b3480156101a857600080fd5b50610161600160a060020a03600435811690602435166044356103b4565b3480156101d257600080fd5b5061018a600160a060020a03600435166104b7565b3480156101f357600080fd5b506101fc6104c9565b6040805160ff9092168252519081900360200190f35b34801561021e57600080fd5b5061018a600160a060020a03600435811690602435166104d2565b34801561024557600080fd5b5061018a600160a060020a03600435166104ef565b34801561026657600080fd5b506100c861050a565b34801561027b57600080fd5b50610161600160a060020a0360043516602435610565565b34801561029f57600080fd5b5061018a600160a060020a03600435811690602435166105ed565b6003805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b820191906000526020600020905b81548152906001019060200180831161032357829003601f168201915b505050505081565b336000818152600160209081526040808320600160a060020a038716808552908352818420869055815186815291519394909390927f8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925928290030190a350600192915050565b60025481565b600160a060020a03831660008181526001602090815260408083203384528252808320549383529082905281205490919083118015906103f45750828110155b15156103ff57600080fd5b600160a060020a038085166000908152602081905260408082208054870190559187168152208054849003905560001981101561046157600160a060020a03851660009081526001602090815260408083203384529091529020805484900390555b83600160a060020a031685600160a060020a03167fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef856040518082815260200191505060405180910390a3506001949350505050565b60006020819052908152604090205481565b60045460ff1681565b600160209081526000928352604080842090915290825290205481565b600160a060020a031660009081526020819052604090205490565b6005805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156103405780601f1061031557610100808354040283529160200191610340565b3360009081526020819052604081205482111561058157600080fd5b3360008181526020818152604080832080548790039055600160a060020a03871680845292819020805487019055805186815290519293927fddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef929181900390910190a350600192915050565b600160a060020a039182166000908152600160209081526040808320939094168252919091522054905600a165627a7a7230582084c618322109054a21a57e27075384a6172ab854e4b2c2d35062a964a6bf593f0029";
public EIP20DeploymentBase() : base(BYTECODE) { }
public EIP20DeploymentBase(string byteCode) : base(byteCode) { }
[Parameter("uint256", "_initialAmount", 1)]
public BigInteger InitialAmount { get; set; }
[Parameter("string", "_tokenName", 2)]
public string TokenName { get; set; }
[Parameter("uint8", "_decimalUnits", 3)]
public byte DecimalUnits { get; set; }
[Parameter("string", "_tokenSymbol", 4)]
public string TokenSymbol { get; set; }
}
[Function("transfer", "bool")]
public class TransferFunctionBase : FunctionMessage
{
[Parameter("address", "_to", 1)]
public string To { get; set; }
[Parameter("uint256", "_value", 2)]
public BigInteger Value { get; set; }
}
public partial class TransferFunction : TransferFunctionBase
{
}
[Function("balanceOf", "uint256")]
public class BalanceOfFunction : FunctionMessage
{
[Parameter("address", "_owner", 1)]
public string Owner { get; set; }
}
[FunctionOutput]
public class BalanceOfFunctionOutput : IFunctionOutputDTO
{
[Parameter("uint256", 1)]
public int Balance { get; set; }
}
[Event("Transfer")]
public class TransferEventDTOBase : IEventDTO
{
[Parameter("address", "_from", 1, true)]
public virtual string From { get; set; }
[Parameter("address", "_to", 2, true)]
public virtual string To { get; set; }
[Parameter("uint256", "_value", 3, false)]
public virtual BigInteger Value { get; set; }
}
public partial class TransferEventDTO : TransferEventDTOBase
{
public static EventABI GetEventABI()
{
return EventExtensions.GetEventABI<TransferEventDTO>();
}
}
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8、智能合约部署
为了部署智能合约，我们使用节点 url 和签名信息创建一个 TransactionSignedUnityRequest。 创建一个新的 EIP20Deployment 合约定义，我们设置构造函数参数并发送交易。最后，我们创建 TransactionReceiptPollingRequest 来轮询交易收据并从交易收据中检索新部署的合约地址：
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var url = "http://localhost:8545";
var privateKey = "0xb5b1870957d373ef0eeffecc6e4812c0fd08f554b37b233526acc331bf1544f7";
var account = "0x12890d2cce102216644c59daE5baed380d84830c";
//initialising the transaction request sender
var transactionRequest = new TransactionSignedUnityRequest(url, privateKey, "YOURCHAINID");
var deployContract = new EIP20Deployment()
{
InitialAmount = 10000,
FromAddress = account,
TokenName = "TST",
TokenSymbol = "TST"
};
//deploy the contract
yield return transactionRequest.SignAndSendDeploymentContractTransaction<EIP20DeploymentBase>(deployContract);
if (transactionRequest.Exception != null)
{
Debug.Log(transactionRequest.Exception.Message);
yield break;
}
var transactionHash = transactionRequest.Result;
Debug.Log("Deployment transaction hash:" transactionHash);
//create a poll to get the receipt when mined
var transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
//checking every 2 seconds for the receipt
yield return transactionReceiptPolling.PollForReceipt(transactionHash, 2);
var deploymentReceipt = transactionReceiptPolling.Result;
Debug.Log("Deployment contract address:" deploymentReceipt.ContractAddress);
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9、查询智能合约
要查询智能合约，我们需要创建一个提供 FunctionType 和 ReturnType 的新 QueryUnityRequest。 然后我们将执行查询，查询结果 Result 对象将为我们提供已经解码的合约的输出：
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//Query request using our acccount and the contracts address (no parameters needed and default values)
var queryRequest = new QueryUnityRequest<BalanceOfFunction, BalanceOfFunctionOutput>(url, account);
yield return queryRequest.Query(new BalanceOfFunction(){Owner = account}, deploymentReceipt.ContractAddress);
//Getting the dto response already decoded
var dtoResult = queryRequest.Result;
Debug.Log(dtoResult.Balance);
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10、转账交易
发送交易以便与与智能合约进行交互的步骤类似于部署。我们首先创建一个 TransactionSignedUnityRequest 和包含任何参数的函数，一旦发送交易，我们会轮询确认交易成功的交易收据。
使用交易收据，我们可以解码该交易的任何日志/事件：
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var transactionTransferRequest = new TransactionSignedUnityRequest(url, privateKey, "YOURCHAINID");
var newAddress = "0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe";
var transactionMessage = new TransferFunction
{
FromAddress = account,
To = newAddress,
Value = 1000,
};
yield return transactionTransferRequest.SignAndSendTransaction(transactionMessage, deploymentReceipt.ContractAddress);
var transactionTransferHash = transactionTransferRequest.Result;
Debug.Log("Transfer txn hash:" transactionHash);
transactionReceiptPolling = new TransactionReceiptPollingRequest(url);
yield return transactionReceiptPolling.PollForReceipt(transactionTransferHash, 2);
var transferReceipt = transactionReceiptPolling.Result;
var transferEvent = transferReceipt.DecodeAllEvents<TransferEventDTO>();
Debug.Log("Transferd amount from event: " transferEvent[0].Event.Value);
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11、日志和事件
为了检索智能合约的日志/事件，我们使用 EthGetLogsUnityRequest 和特定于我们事件的 FilterInput。 可以使用 EventDTO 扩展 GetEventABI() 创建 FilterInputs。一旦我们生成了请求，我们就可以使用 Result.DecodeAllEvents 扩展方法解码所有匹配的事件。
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var getLogsRequest = new EthGetLogsUnityRequest(url);
var eventTransfer = TransferEventDTO.GetEventABI();
yield return getLogsRequest.SendRequest(eventTransfer.CreateFilterInput(deploymentReceipt.ContractAddress, account));
var eventDecoded = getLogsRequest.Result.DecodeAllEvents<TransferEventDTO>();
Debug.Log("Transferd amount from get logs event: " eventDecoded[0].Event.Value);
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原文链接：http://blog.hubwiz.com/2022/01/28/nethereum-unity-tutorial/
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