cannot denodeify methods in node-ftp module

[Quoc Lam]

Hi,

I am new to both node.js and promise style function call. By looking at an denodeify example at http://runnable.com/Ulatc0QnzUgUAAAK/adapting-node-js-with-q-for-promises, I am trying to denodeify the methods of the node.js node-ftp module as following:

var ftp = require('ftp');
var q = require('q');
var ftpClient = new ftp();
ftpClient.on('ready', function() {
    var ftpList = q.denodeify(ftpClient.list);
    ftpList().then(function(list) {
        console.log(list);
    }.then(null, function(err) {
        console.log(err);
    }).done(function() {
        ftpClient.end();
    });
});
ftpClient.connect();

However, when running that code with node, it shows the error "list error: TypeError: Object # has no method '_pasv'"

I am not sure what's wrong with that piece of code. Does anyone know what's wrong with that? Can you point me some way to debug/troubleshoot the cause of that error message?

Thanks,

Quoc

[Jason Crawford]

I think you want Q.nbind(ftpClient.list, ftpClient), not Q.denodeify(ftpClient.list). The former will make sure that the 'list' method is called with the ftpClient as its context.

More on these two methods: http://documentup.com/kriskowal/q#tutorial/adapting-node

Hope that helps,

Jason

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Blog: http://blog.jasoncrawford.org  |  Twitter: @jasoncrawford

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