Reading file from SFTP server using Node.js and SSH2

Question

I have a pretty strange problem working with read streams in Node.js. I\'m using SSH2 to create a sftp connection between me and a sftp server. I then try to create a read strea

Answer 1

If the byte size (or chunk size) is not mandatory and you just need to get the file, guess there is a much better lighter-and-faster way (yeah...the nodejs way!). This is how I use to copy a file:

function getFile(remoteFile, localFile) {
     conn.on('ready', function () {
     conn.sftp(function (err, sftp) {
         if (err) throw err;
         var rstream = sftp.createReadStream(remoteFile);
         var wstream = fs.createWriteStream(localFile);
         rstream.pipe(wstream);
         rstream.on('error', function (err) { // To handle remote file issues
             console.log(err.message);
             conn.end();
             rstream.destroy();
             wstream.destroy();
         });
         rstream.on('end', function () {
             conn.end();
         });
         wstream.on('finish', function () {
             console.log(`${remoteFile} has successfully download to ${localFile}!`);
         });
     });
   }).connect(m_ssh2Credentials);
}

As an alternative, you can also try sftp.fastGet() which uses parallel reads to bring the file quickly. fastGet() provides you a way to show the progress of the download (if wanted) apart from giving a way to configure the number of parallel reads and chunk size. To know more, open this SFTPStream doc and search for fastGet.

Here is a very quick code:

sftp.fastGet(remoteFile, localFile, function (err) {
    if (err) throw err;
    console.log(`${remoteFile} has successfully download to ${localFile}!`);
}

HIH!