javascript - Console.log 不会在 forEach 中打印任何内容

Question

我正在使用 Polkadot API 来获取网络中活动验证器的列表并编写以下代码：

在 Polkadot js 沙箱中打开 https://polkadot.js.org

// All code is wrapped within an async closure,
// allowing access to api, hashing, types, util.
// (async ({ api, hashing, types, util }) => {
//   ... any user code is executed here ...
// })();

const [chain, nodeName, nodeVersion] = await Promise.all([
  api.rpc.system.chain(),
  api.rpc.system.name(),
  api.rpc.system.version()
]);

console.log(`Connected to chain ${chain} using ${nodeName} v${nodeVersion}`);

// Retrieve active validators
const [validators] = await Promise.all([
  api.query.session.validators()
]);

if (validators && validators.length > 0) {

  // Map staking stats to validators
  const validatorStaking = await Promise.all(
    validators.map(authorityId => api.query.staking.ledger(authorityId))
  );

  var rank = 1;
  validators.forEach((authorityId, index) => {

    // Get staking stats for current validator
    var validator = JSON.parse(validatorStaking[index])

    // Get nominators, then print information
    Promise.all([
      api.query.staking.stakers(validator.stash)
    ]).then(nominators => {
      return nominators
    }).then(function(nominators) {

      // Iterate over nominators list
      var total = 0
      var nominatorsList = ''
      nominators[0].others.forEach((nominator, index) => {
        total = total + parseInt(nominator.value)
        nominatorsList += '    [' + (index + 1) + '] ' + nominator.who + ' => ' + parseFloat(nominator.value / 1000000000000000).toFixed(3) + ' DOT\n'
      })

      console.log('\n[ ' + rank + ' ] Validator: ' + authorityId.toString())
      console.log( ' -> Controller: ' + authorityId.toString() )
      console.log( ' -> Stash: ' + validator.stash)
      console.log( ' -> Self bonded: ' + parseFloat(validator.total / 1000000000000000).toFixed(3) + ' DOT')
      console.log( ' -> Bonded by nominators: ' + parseFloat(total / 1000000000000000).toFixed(3) + ' DOT' )
      console.log( ' -> Total Bonded: ' + (parseFloat((total) / 1000000000000000) + parseFloat((validator.total) / 1000000000000000) ).toFixed(3) + ' DOT' )
      console.log( ' -> Nominators:' )
      console.log( nominatorsList )

      rank++
    }).catch(err => {
      console.log(err);
    })
  })
}

代码在https://polkadot.js.org/apps/#/js中按预期运行，打印了一些关于验证器的有用信息。

我想在我的 Polkadot 全节点中执行相同的代码，所以我使用 api 文档的第一个示例修改我的代码：

// @ts-check
// Required imports
const { ApiPromise, WsProvider } = require('@polkadot/api');

async function main () {

  //
  // Initialise the provider to connect to the local polkadot node
  //
  const provider = new WsProvider('ws://127.0.0.1:9944');

  // Create the API and wait until ready
  const api = await ApiPromise.create(provider);

  // Retrieve the chain & node information
  const [chain, nodeName, nodeVersion] = await Promise.all([
    api.rpc.system.chain(),
    api.rpc.system.name(),
    api.rpc.system.version()
  ]);

  console.log(`Connected to chain ${chain} using ${nodeName} v${nodeVersion}`);

  // Retrieve active validators
  const [validators] = await Promise.all([
    api.query.session.validators()
  ]);

  if (validators && validators.length > 0) {

    // Map staking stats to validators
    const validatorStaking = await Promise.all(
      validators.map(authorityId => api.query.staking.ledger(authorityId))
    );

    var rank = 1;
    validators.forEach((authorityId, index) => {

      // Get staking stats for current validator
      var validator = JSON.parse(validatorStaking[index])

      // Get nominators, then print information
      Promise.all([
        api.query.staking.stakers(validator.stash)
      ]).then(nominators => {
        return nominators
      }).then(function(nominators) {

        // Iterate over nominators list
        var total = 0
        var nominatorString = ''
        nominators[0].others.forEach((nominator, index) => {
          total = total + parseInt(nominator.value)
          nominatorString += '    [' + (index + 1) + '] ' + nominator.who + ' => ' + parseFloat(nominator.value / 1000000000000000).toFixed(3) + ' DOT\n'
        })

        console.log('\n[ ' + rank + ' ] Validator: ' + authorityId.toString())        
        console.log( ' -> Controller: ' + authorityId.toString() )
        console.log( ' -> Stash: ' + validator.stash)
        console.log( ' -> Self bonded: ' + parseFloat(validator.total / 1000000000000000).toFixed(3) + ' DOT')
        console.log( ' -> Bonded by nominators: ' + parseFloat(total / 1000000000000000).toFixed(3) + ' DOT' )
        console.log( ' -> Total Bonded: ' + (parseFloat((total) / 1000000000000000) + parseFloat((validator.total) / 1000000000000000) ).toFixed(3) + ' DOT' )        
        console.log( ' -> Nominators:' )
        console.log( nominatorString )

        rank++
      }).catch(err => {
        console.log(err);
      })
    })
  }
}

main().catch(console.error).finally(() => process.exit());

修改后的代码可以毫无问题地从本地 polkadot 节点获取信息。问题是 forEach 语句中的 console.logs 没有打印任何内容。

我做错了什么？第一个代码在 Polkadot 网站上完美运行，显示以下输出：

Connected to chain Alexander using parity-polkadot v0.4.4

[ 1 ] Validator: 5GeJHN5EcUGPoa5pUwYkXjymoDVN1DJHsBR4UGX4XRAwK1Ez
 -> Controller: 5GeJHN5EcUGPoa5pUwYkXjymoDVN1DJHsBR4UGX4XRAwK1Ez
 -> Stash: 5DuiZFa184E9iCwbh4WjXYvJ88NHvWJbS8SARY8Ev1YEqrri
 -> Self bonded: 500.000 DOT
 -> Bonded by nominators: 3.384 DOT
 -> Total Bonded: 503.384 DOT
 -> Nominators:
    [1] 5CpSTAh8e8Z8Xq47TDLJz8pn9wTWJ5o47F9bM5McP2kFggf9 => 0.002 DOT
    [2] 5EKv5WtPrm3oE56XojPtAQR8wtiHVNJ9BaM8StPKgzqPPXpG => 0.100 DOT
    [3] 5FeQ1oB2ek2LQGY2SyaHU7UftdwZLT3TNif8ksKvxES1joiD => 0.148 DOT
    [4] 5EEe1QBewqUkVoUT6rmMWtxktcAXcjadFiB6zNwdAgkvM6pw => 0.100 DOT
    [5] 5GryLKn5HrFGXhSQTcgAWEoaFqBGov2voUfawF5nVcsQs8QR => 0.100 DOT
    [6] 5F6is3DBLJreMEpDCN1mDG6RAAHuhGyPx6rzxZ52BfVB9822 => 0.100 DOT
    [7] 5CSopKqGJAyUyAwvxJvwz5NnEZe9eTNTxdXnLDdgSBXrwV36 => 0.148 DOT
    [8] 5Gxn6e7xFYWFS4WZGrHVq7tLkUCTwDVzDJGttweMFAM2s1os => 0.100 DOT
    [9] 5GZBbVudNqkyrwFr1B89N2kCKj5hSwphX8VyvCsWTNg2vb8k => 0.140 DOT
    [10] 5FJArxJ2965RVmBtbUxSLPHMMW2Hkd39akTbRBvRqqffewqk => 0.180 DOT
    [11] 5CHs11e7oWTX7jSW3A6qHJjGdw2BoQGrocoXTzmYoh9aTSZ5 => 0.100 DOT
    [12] 5FCUUyVRBv1M3sjkKhsPEqjmftt43NRyH1fkbiKXswJwRQei => 0.388 DOT
    [13] 5GsZJprFgwyLXiv91XBbNR6xMJU7poEkCCgnKRk8Y7RNa5mY => 0.100 DOT
    [14] 5DqrgoGUigk6GKWE4cnxiqWqBFbDbD1dnEhcSCNBgibsveoS => 0.258 DOT
    [15] 5GDftAqfcQNSnVuKviALyxiDTRP1kSGPKHpdueSz1gLTfgS2 => 0.128 DOT
    [16] 5E7ibdmaVkV1jWbj3HPev2xPstRf17kFjQCjfnGU8iTNWKGq => 1.000 DOT
    [17] 5DfnhKjxZaaUcPW1VYuHfBTuGaE9Fg1mDAnTQera45WCLv8N => 0.018 DOT
    [18] 5CPHNVVLQ5b9esNbT9ZHZiPFvjfw2xbNf83CxP2nmA6yZQDM => 0.000 DOT
    [19] 5FyGYnwUur577KDcdkyyMouprFweXgnQc5KQggJ2QD74MgkC => 0.275 DOT

[ 2 ] Validator: 5DPW1n4q2THUjKGj3QKkcqdh6oxY1bmLsSQ7t8FuiuNtRv4S
 -> Controller: 5DPW1n4q2THUjKGj3QKkcqdh6oxY1bmLsSQ7t8FuiuNtRv4S
 -> Stash: 5DqAzPeXXmBS8p6TjtvjWZPRkqkmeT15KqXoYAg2LShgu9pd
 -> Self bonded: 500.000 DOT
 -> Bonded by nominators: 1.333 DOT
 -> Total Bonded: 501.333 DOT
 -> Nominators:
    [1] 5FHKn8H5L2s5Sar3uhpLoUMqto9J5JWYXNUio7dRKr8E84zu => 0.100 DOT
    [2] 5E4zTNJRPNu9afjsMEjK88MTxVBzXEn55Exf1pW1rW25ysA9 => 0.177 DOT
    [3] 5DPyJoPbVB2PcviCfBxaALj6aj33cS4smAsFz8qPSvKdcVFB => 0.100 DOT
    [4] 5DsS6mvvg3CBxQsvoPFEsSsJB9T9mz13g9GqTnhj4u8KZStV => 0.120 DOT
    [5] 5E9WSxB1YQTJQC7xxirsYKkjMw8vTUffkcLdmWkNPmAPgiA1 => 0.440 DOT
    [6] 5HBbUGki4VmLb8AJ9mHEe8vK9ayiQUfpCanePt21EJchu3oS => 0.295 DOT
    [7] 5ELanwMU5rC4tCGuEdxERA5tdyPnBEC32oLvsLfsWFDsTyK7 => 0.100 DOT
...

第二个仅在使用 nodejs v10.16.0 执行时显示此输出：

Connected to chain Alexander using parity-polkadot v0.4.4

标签： javascriptnode.jsforeachpromiseconsole.log