无法从 ganache 提供商处获取帐户

Posted 2023-02-18

【中文标题】无法从 ganache 提供商处获取帐户

【英文标题】：Unable to get accounts from ganache provider

【发布时间】：2019-07-03 19:15:49

【问题描述】：

我正在尝试按照一些关于以太坊区块链的 udemy 课程中描述的步骤在 mocha 上运行测试。

这是我目前拥有的 package.json 文件：

  "name": "inbox",
  "version": "1.0.0",
  "description": "",
  "main": "index",
  "typings": "index",
  "scripts": 
    "test": "mocha"
  ,
  "author": "",
  "license": "ISC",
  "dependencies": 
    "ganache-cli": "^6.3.0",
    "mocha": "^5.2.0",
    "solc": "^0.4.17",
    "web3": "^1.0.0-beta.37"
  

当我运行时：npm run test，我遇到了这个问题：

 Inbox contract
Error: No callback provided to provider's send function. As of web3 1.0, provider.send is no longer synchronous and must be passed a callback as its final argument.
    at b.send (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\ganache-cli\build\ganache-core.node.cli.js:25:90931)
    at GetAccountsMethod._callee$ (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\web3-core-method\dist\web3-core-method.cjs.js:454:55)
    at tryCatch (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\regenerator-runtime\runtime.js:62:40)
    at Generator.invoke [as _invoke] (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\regenerator-runtime\runtime.js:288:22)
    at Generator.prototype.(anonymous function) [as next] (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\regenerator-runtime\runtime.js:114:21)
    at asyncGeneratorStep (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\@babel\runtime\helpers\asyncToGenerator.js:3:24)
    at _next (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\@babel\runtime\helpers\asyncToGenerator.js:25:9)
    at C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\@babel\runtime\helpers\asyncToGenerator.js:32:7
    at new Promise (<anonymous>)
    at GetAccountsMethod.<anonymous> (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\@babel\runtime\helpers\asyncToGenerator.js:21:12)
    at GetAccountsMethod.execute (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\web3-core-method\dist\web3-core-method.cjs.js:477:25)
    at Proxy.anonymousFunction (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\web3-core-method\dist\web3-core-method.cjs.js:228:25)
    at Context.beforeEach (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\test\Inbox.test.js:9:14)
    at callFn (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\mocha\lib\runnable.js:372:21)
    at Hook.Runnable.run (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\mocha\lib\runnable.js:364:7)
    at next (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\mocha\lib\runner.js:317:10)
    at Immediate.<anonymous> (C:\Users\bsimperc\Desktop\SCOMP\blockchain-projects\Inbox\node_modules\mocha\lib\runner.js:347:5)
    at runCallback (timers.js:705:18)
    at tryOnImmediate (timers.js:676:5)
    at processImmediate (timers.js:658:5)
    √ deploys a contract


  1 passing (27ms)

我最初使用的是 web3@1.0.0-beta.26，因为这是课程中使用的版本。但是我收到错误“addProviders 不是函数”，通过更新到 beta.37 版本解决了这个问题

最后这是我的部分代码，正如在这个库实现承诺的课程中提到的那样：

const assert = require("assert");
const ganache = require("ganache-cli");
const Web3 = require("web3");

const web3 = new Web3(ganache.provider()); //Crea una instancia de web3 y le indica que debe conectarse a la red local de pruebba de ganache 


beforeEach(() => 
    web3.eth.getAccounts()
        .then(accounts => 
            console.log(accounts);
        )
        .catch(err => 
            console.log(err);
        );
    // Obtenemos las cuentas que genera ganache

    //Usamos una de las cuentas para desplegar el contrato

);

describe("Inbox contract", () => 
    it("deploys a contract", () => 

    );
)

我真的很感激任何帮助，因为它是一个实习项目，而且这是我第一次使用任何区块链环境。

PS：这里的建议或建议都没有奏效： - https://github.com/trufflesuite/ganache-core/issues/15 - https://github.com/trufflesuite/ganache-cli/issues/246

【问题讨论】：

我完成了相同的 udemy 课程。这是我完成收件箱教程后的repo。看看有没有帮助。我还在我的项目中使用了您的package.json 和Index.test.js，但无法重现错误。

【参考方案1】：

我遇到了同样的问题，我通过将我的 mocha、ganache-cli、solc 和 web3 设置为以下版本来解决它

  "name": "inbox",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": 
    "test": "mocha"
  ,
  "author": "",
  "license": "ISC",
  "dependencies": 
    "ganache-cli": "^6.0.3",
    "mocha": "^4.0.1",
    "solc": "^0.4.19",
    "web3": "^1.0.0-beta.37"
  

【讨论】：

成功了！非常感谢，我想是摩卡版的。关于为什么会发生这种情况的任何想法？再次