Nodejs异步转同步

Question

我是nodejs和javascript的新手，我目前正在开发一个开源项目，因为昨晚我试图将此函数从异步转换为同步，但我做不到，我使用了async/await，但我认为我不太理解这个概念，这个函数使用 aes256 算法加密和压缩文件，我异步工作得很好，但我想添加这个新功能，允许您递归地加密目录的内容。

function encrypt({ file, password }, error_callback, succ_callback) {
    const initVect = crypto.randomBytes(16);

    // Generate a cipher key from the password.
    const CIPHER_KEY = crypto.createHash('sha256').update(password).digest();;
    const readStream = fs.createReadStream(file);
    const gzip = zlib.createGzip();
    const cipher = crypto.createCipheriv('aes-256-cbc', CIPHER_KEY, initVect);
    const appendInitVect = new AppendInitVect(initVect);
    // Create a write stream with a different file extension.
    const writeStream = fs.createWriteStream(path.join(file + ".dnc"));

    readStream
      .pipe(gzip)
      .pipe(cipher)
      .pipe(appendInitVect)
      .pipe(writeStream);

    readStream.on('error', error_callback);
    readStream.on('end', succ_callback);
}

Answer 1

尝试使用承诺。通过稍微更改代码，您可以承诺该功能，然后等待所有承诺解决或拒绝，然后再采取行动。

function encrypt({ file, password }) {
  const initVect = crypto.randomBytes(16);

// Generate a cipher key from the password.
  const CIPHER_KEY = crypto.createHash('sha256').update(password).digest();;
  const readStream = fs.createReadStream(file);
  const gzip = zlib.createGzip();
  const cipher = crypto.createCipheriv('aes-256-cbc', CIPHER_KEY, initVect);
  const appendInitVect = new AppendInitVect(initVect);
// Create a write stream with a different file extension.
  const writeStream = fs.createWriteStream(path.join(file + ".dnc"));

  readStream
    .pipe(gzip)
    .pipe(cipher)
    .pipe(appendInitVect)
    .pipe(writeStream);


  const promise = new Promise();
  writeStream.on('error', err => promise.reject(err));
  writeStream.on('end', data => promise.resolve(data));
  return promise;
}

const promise1 = encrypt({file1, password1});
const promise2 = encrypt({file2, password2});

Promise.all([promise1, promise2])
  .then(succ_callback)
  .catch(error_callback);

我还没有运行此代码，因此可能需要一些调整才能使其工作，但这是一般要点。