在以太坊中部署智能合約時如何解決錯誤？

Question

當嘗試使用solc-js編譯智能合約時，我收到了錯誤

Krishna：投票krishnakankipati $ node deploy.js編譯合同assert.js：350 throw err; ^
AssertionError [ERR_ASSERTION]：指定了無效的回調。

let compilerInput = {
     'Voter': fs.readFileSync('Voter.sol', 'utf8')
};

console.log('Compiling the contract')
// Compile and optimize the contract
let compiledContract = solc.compile(compilerInput, 1);

// Get compiled contract
let contract = compiledContract.contracts['Voter:Voter'] // Voter contract from Voter file.

 // Save contract's ABI
let abi = contract.interface;
fs.writeFileSync('abi.json', abi);

Answer 1

您沒有正確使用solc-js。 您需要對輸入進行字符串化，然后傳遞1而不是導入回調。 請在發布問題之前閱讀文檔： https ： //github.com/ethereum/solc-js

考慮使用etherjs，更好的文檔和比web3更強大。

Answer 2

請務必閱讀solc v0.5.0 +的solc文檔 ，以確保您正在調整Solidity編譯器的更改。

這樣的東西應該與最新版本的solc兼容：

// Note: You should be defining your contract sources as objects now.
// Note: You must also provide the compiler output selection as well.
const compilerInput = {
    language: "Solidity",
    sources: {
        'Voter': { content: fs.readFileSync('Voter.sol', 'utf8') }
    },
    settings: {
      outputSelection: {
        "*": {
          "*": [ "abi", "evm.bytecode" ]
        }
      }
    }
};

console.log('Compiling the contract')
// Note: You have to pass the input in with JSON.stringify now.
const compiledContract = JSON.parse(solc.compile(JSON.stringify(compilerInput)));

if(compiledContract.errors) {
    compiledContract.errors.forEach(err => console.log(err.formattedMessage));
}

// Note: This changed slightly since I'm using JSON.parse above.
const contract = compiledContract.contracts['Voter'].Voter; // Voter contract from Voter file.

// Note: This is now called 'abi' and not 'interface'
const abi = contract.abi;
fs.writeFileSync('abi.json', JSON.stringify(abi, null, 2));

您還需要更新deployContract函數以與solc v0.5.0 +同步

async function deployContract(web3, contract, sender) {
    let Voter = new web3.eth.Contract(JSON.parse(JSON.stringify(abi)));
    let bytecode = '0x' + contract.evm.bytecode.object;
    let gasEstimate = await web3.eth.estimateGas({data: bytecode});

    // The rest should work fine...
}