從 NodeJS 應用程序中的另一個契約導入契約

我在我的 NodeJS 應用程序中使用一個函式來部署契約。使用者輸入他希望部署的合約，應用程序就會部署它。應用程序的結構是

.
├── app
│   ├── models
│   │   └── user.js
│   └── routes.js
├── cert.pem
├── config
│   ├── auth.js
│   ├── database.js
│   └── passport.js
├── contracts
│   ├── Registry.sol
│   ├── TrustEntity.sol
│   └── User.sol
├── key.pem
├── modules
│   ├── contracts.js
│   └── helpers.js

TrustEntity.sol 是

pragma solidity ^0.4.11;
import "./User.sol";

contract TrustEntity {
   address owner;
   address registry;
   address[] pendingRequests;

   function pushPending(address requester) {
       pendingRequests.push(requester);
   }
}

和 User.sol 是

pragma solidity ^0.4.11;
import "./TrustEntity.sol";

contract User {
   // State variables
   TrustEntity trustEntity;
   address owner = msg.sender;
   bool verified = false;
   uint creationTime = now;
   uint level = 0;
   address[] public pendingRequests;

   // Set trustEntity's deployed contract address
   function User(address _trustEntity) {
       trustEntity = TrustEntity(_trustEntity);
   }

   function requestValidation() {
       trustEntity.pushPending(owner);
   }
}

最後，部署函式的相關部分是

function deploy(contractName, publicAddress, _gas) {
   // Get the contract code from contracts
   const input = fs.readFileSync('contracts/' + contractName + '.sol').toString();
   const output = solc.compile(input);
   // The trailing ':' is needed otherwise it crashes
   const bytecode = output.contracts[':' + contractName].bytecode;
   const abi = JSON.parse(output.contracts[':' + contractName].interface);
   console.log(abi[0].inputs[0]);
   const contract = web3.eth.contract(abi);
   console.log("Contract:" + contract);
   const contractInstance = contract.new({
   .
   .
   .
}

當我嘗試它時，返回以下錯誤

{ contracts: {},
 errors: [ ':2:1: ParserError: Source "User.sol" not found: File not supplied initially.\nimport "./User.sol";\n^------------------^\n' ],
 sourceList: [ '' ],
 sources: {} }
TypeError: Cannot read property 'bytecode' of undefined

即使文件說（如預期的那樣）.指的是目前目錄。具體來說，他們說：“要從x與目前文件相同的目錄導入文件，請使用import "./x" as x;”。此外，它在 Remix 中執行良好，所以我不確定錯誤在哪裡。

您需要將每個合約作為字元串導入，然後將它們全部傳遞給solidity https://github.com/ethereum/solc-js#from-version-016

這對我有用：

   fs.readFile(fullFileName, 'utf8', (err, data) => {

   const compiled = solc.compile(data);

   const bytecode = compiled.contracts[':' + name].bytecode
   const abi = JSON.parse(compiled.contracts[':' + name].interface)

   ...

   const contractData = '0x' + bytecode

   const rawTx = {
       nonce: nonceHex,
       gasPrice: gasPriceHex,
       gasLimit: gasLimitHex,
       data: contractData,
       from: mainAccount
   };


   const tx = new EthTx(rawTx)
   tx.sign(new Buffer(pKey, 'hex'))
   const txHex = tx.serialize().toString('hex')

   web3.eth.sendSignedTransaction(`0x${txHex}`).on('receipt', (receipt) => {

       ...

引用自：https://ethereum.stackexchange.com/questions/23696