呈现两个单独的async.each方法的结果

2024-05-18 • 问答

我是nodejs和async的新手。无法理解如何包装两个单独的async.each方法以具有一个res.render ...我试图在前端显示有效帐户ID和有效用户ID的列表。两种单独的async.each方法是：

async.each(account_ids,function(accountId,callback) {
        console.log('Processing accountId ' + accountId);

        callingExternalApi(accountId,callback,function(err,response){
          if(err){
            console.log("error account");
          }
          console.log("account response is: ",response);
        });

      },function(err) {
        if( err ) {
          console.log('An account failed to process');
        } else {
          console.log('All accounts have been processed successfully');
        }
      });

和

async.each(email_ids,function(emailId,callback) {
        console.log('Processing email id ' + emailId);
        request({
          url: emailIdlookupUrl,method: 'POST',json: {
            email_address: emailId
          }
        },function (err,response,body) {
          if (err) {
            logger.error(err);
            req.flash('error',err.message);
            return res.redirect('?');
          }
          if (response.statusCode !== 200) {
            const msg = 'Unable to verify user';
            req.flash('error',msg);
            return res.redirect('?');
          }
          console.log("user id is: ",body.user.id);
          callback();
        });

      },function(err) {
        if( err ) {
          console.log('An email failed to process');
        } else {
          console.log('All user emails have been processed successfully');
        }
      });

我们非常感谢您的帮助。请原谅任何多余的回调或错误记录。还在学习nodejs。

谢谢！

主要问题不是您要同时调用这两个async.each调用。问题在于它们将并行运行，而调用req。*函数或回调函数的最快的函数将返回对连接的响应。

如果省略了它们的回调参数，则这两个函数都将返回promise。

我建议一般同时阅读异步库和JS async / await：

请注意，异步还接受本机异步功能，许多查找程序更简洁，更易于理解。

这是我想从上面的代码中得到的，包括将结果编译成列表：

var request = require("request-promise");

async function checkAccounts(account_ids) {
  const valid_accounts = [];
  await async.each(account_ids,async function(accountId) {
    console.log("Processing accountId " + accountId);
    const extAPIresult = await callingExternalApi(accountId);
    console.log("account response is: ",extAPIresult);
  });
  valid_accounts.push(extAPIresult);
  console.log("All accounts have been processed successfully");
  return valid_accounts;
}

async function checkEmails(email_ids) {
  const valid_emails = [];
  await async.each(email_ids,async function(emailId) {
    console.log("Processing email id " + emailId);
    const reqresult = await request({
      url: emailIdlookupUrl,method: "POST",json: {
        email_address: emailId
      }
    });
    if (reqresult.statusCode !== 200) {
      throw new Error("Unable to verify user");
    }
    valid_emails.push(reqresult.body.user.id);
    console.log("user id is: ",reqresult.body.user.id);
  });
  console.log("All emails have been processed successfully");
  return valid_emails;
}

async function doChecks() {
  const accounts = checkAccounts(account_ids);
  const emails = checkEmails(email_ids);
  const responses = await Promises.all([accounts,emails]);
  console.log("All checks have been processed successfully");
  return responses;
}

function get(req,res) {
  doChecks()
    .then(responses => {
      res.send("All checks have been processed successfully");
      res.send(String(responses));
    })
    .catch(err => {
      req.flash("error",err.message);
      res.redirect("?");
    });
}

呈现两个单独的async.each方法的结果

sl0359 回答：呈现两个单独的async.each方法的结果

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