Sending compressed report before sending in email

ChetnaNB

I want to compress reports before sending them as attachment in the email.
I am able to send the attachment in email by using following code, but facing issue while trying to compress them before sending. Please help.

 function afterRender(req, res, done) {
var mailer = require('nodemailer');
var fs= require('fs');
var zlib = require('zlib');

var compress = zlib.createGzip();
var newFileName='a.gz';

/*
var writeStream = fs.createWriteStream("JournalDEV.png");
writeStream.write(res.content);
writeStream.end();
*/
const streamifier = require('streamifier');

var writestream = fs.createWriteStream(newFileName);
var vv2 = streamifier.createReadStream(res.content.buffer).pipe(writestream);

const transporter = mailer.createTransport({
service: 'emailservice',
auth: {
    user: 'sender@email.com',
    pass: 'SuperSecurePassword#' // naturally, replace both with your real credentials or an application-specific password
}
});
const mailOptions = {
from: 'sender@email.com',
to: 'receiver@email.com',
subject: 'Sending Chrome Image reports from jsReport',
text: "See the attached report",
    html: "<b>See the attached report</b>",
    attachments: [
    {  
       content: vv2 
    }],
};
transporter.sendMail(mailOptions, function(error, info){
    transporter.close();
    if(error){
        console.log(error);
        return done(error);
    }
    else {
         console.log('Email sent: ' + info.response);
    }
    return done();
});

}

As it can be seen in screenshot, I tried to implement it using zlib, fs, streamifier, tried various combinations to achieve it, but still facing issue in compression. Any suggestion??

bjrmatos

Hi!

i think there are some things wrong in your code, first the res.content is already a buffer so you don't need to access something like res.content.buffer, and then the other issue is that your vv2 variable ends up being a writable stream, and the attachment in the email expects a readable stream. the following should work for you

const streamifier = require('streamifier');
var vv2 = streamifier.createReadStream(res.content).pipe(compress);

// ...the later in your nodemailer code..
attachments: [
    {  
       filename: newFileName,
       content: vv2 
    }]

ChetnaNB

Hi Boris,

Thanks for quick response, I am very new to js.
I modified the code as per your suggestion, but still getting issue while trying to extract. The error is:
Cannot open the file as archive, is not archive

ChetnaNB

It worked, thanks a lot Boris :)