在发送邮件之前等待文件创建

Question

我在使用 nodemailer 的功能时遇到了一些问题，我需要从 body req 创建一个 pdf，然后将其附加到邮件并发送，这里的问题是我不知道如何等待文件完成在发送邮件之前保存，我有错误，因为邮件在系统可以创建文件甚至附加 pdf 文件之前发送...

想法是：发送 post 请求 -> 获取 req.body -> 创建 pdf -> 创建邮件选项 (nodemailer) -> 发送邮件。

但现在的代码是这样的：发送 post 请求 -> 获取 req.body -> 创建 pdf -> 创建邮件选项 (nodemailer) -> 发送邮件 -> 系统仍在制作 pdf -> 错误

我当前的代码是：

 app.post('/send', function(req, res) {
        if (req.body.email == "" || req.body.subject == "") {
            res.send("Error: Email & Subject should not blank");
            return false;
        }

        // Sending Emails with SMTP, Configuring SMTP settings

        var smtpTransport = nodemailer.createTransport({
            host: "mail.vyg.cl", // hostname
            secureConnection: true, // use SSL
            port: 465, // port for secure SMTP
            auth: {
                user: 'crm@vyg.cl',
                pass: '******'
            }
        });
        const pdfArchive = './server/' + req.body.subject + '.pdf';


        if (fs.existsSync(pdfArchive)) {
            fs.unlinkSync(pdfArchive);
        }
        pdf.create(req.body.description).toFile('./server/' + req.body.subject + '.pdf', function(err, res) {
            if (err) {
                console.log(err);
            } else {
                console.log(res)

            }
        });

        const mailOptions = {
            from: req.body.from, // sender address
            to: req.body.to, // list of receivers
            cc: req.body.cc,
            subject: req.body.subject, // Subject line
            //text: "Hello world ✔", // plaintext body
            // html: req.body.description, // html body,
            attachments: [{ // file on disk as an attachment
                filename: req.body.subject + '.pdf',
                path: './server/' + req.body.subject + '.pdf' // stream this file
            }]
        }
        smtpTransport.sendMail(mailOptions, function(error, response) {
            if (error) {
                res.status(400).json({ message: "Email could not sent due to error: " + error });
            } else {
                res.status(200).json({ message: "Email has been sent successfully" });
            }
        });
        if (fs.existsSync(pdfArchive)) {
            fs.unlinkSync(pdfArchive);
        }
    });

我尝试在创建 pdf 时按条件发送邮件，但我没有收到 smtpTransport 响应....

任何帮助将不胜感激

Answer 1

app.post('/send', async function(req, res) {
        if (req.body.email == "" || req.body.subject == "") {
            res.send("Error: Email & Subject should not blank");
            return false;
        }

        // Sending Emails with SMTP, Configuring SMTP settings

        var smtpTransport = nodemailer.createTransport({
            host: "mail.vyg.cl", // hostname
            secureConnection: true, // use SSL
            port: 465, // port for secure SMTP
            auth: {
                user: 'crm@vyg.cl',
                pass: '*******'
            }
        });
  
        const mailOptions = {
            from: req.body.from, // sender address
            to: req.body.to, // list of receivers
            cc: req.body.cc,
            subject: req.body.subject, // Subject line
            //text: "Hello world ✔", // plaintext body
            // html: req.body.description, // html body,
            attachments: [{ // file on disk as an attachment
                filename: req.body.subject + '.pdf',
                path: './server/' + req.body.subject + '.pdf' // stream this file
            }]
        }
  
        const pdfArchive = './server/' + req.body.subject + '.pdf';


        if (fs.existsSync(pdfArchive)) {
            await fs.unlinkSync(pdfArchive);// Add wait here
        }
        try{
   
   var result = await pdf.create(req.body.description).toFile('./server/' + req.body.subject + '.pdf') // capture result if you need to
   try{
   await smtpTransport.sendMail(mailOptions) // wrap this in a try catch if you want to capture email sending specific erorrs else outer try catch will work 
   res.status(200).json({ message: "Email has been sent successfully" });
   
   }
   catch(error)
   {
    res.status(400).json({ message: "Email could not sent due to error: " + error });
   }
  }
  catch(error)
  {
   console.log(err);
   res.send(error)
  }
    });

在发送邮件之前等待文件创建

wait file to create before send mail

node.js

nodemailer