Catching ECONNRESET error from spawned Node process - node.js

Question

I am using the sftps NPM to connect to a SFTP server using username/password authentication and upload a file. This works beautifully when successful; however, if provided invalid authentication information, after several minutes it emits an ECONNRESET error which crashes my entire application.
Looking at the source of the sftps module, it appears to use child_process.spawn to run the shell commands, and looks like it should be capturing any errors gracefully:
var sftp = spawn(shellCmd, shellOpts);
var data = "";
var error = "";
sftp.stdout.on('data', function (res) {
data += res;
});
sftp.stderr.on('data', function (res) {
error += res;
});
function finished(err) {
error = error.split('\n').filter(function(line) {
if (/^Connected to /.test(line)) return false;
return true;
}).join('\n');
data = data.split('\n').filter(function(line) {
if (/^sftp> /.test(line)) return false;
return true;
}).join('\n');
if (callback) {
if (err) {
callback(err, { error: error || null, data: data });
} else if (error) {
callback(null, { error: error, data: data });
} else {
callback(null, { error: null, data: data });
}
callback = null;
}
}
sftp.on('error', finished);
sftp.on('exit', function (code) {
if (code === 0) {
finished();
} else {
finished('Nonzero exit code: ' + code);
}
});
sftp.stdin.write(cmdString, 'utf8');
It looks like it has hooked into the stderr stream as well as capturing the error and exit events on the sub-process.
What else can I do to capture this ECONNRESET error and log it without killing the application?

Answer 1

Don't know if you're having the same problem that I was having, but I eventually solved it by attaching an event to stdin.on("error"). You could try this to see if that's the problem:
sftp.stdin.on("error", function (e)
{
console.log("STDIN ON ERROR");
console.log(e);
});