Node.js - copy file from FTP A to FTP B by stream - node.js

Question

I want to copy data from FTP A to FTP B.
I use stream instead of the local temp file.
But i cannot read the data from stream.
transformComponent.js
const Transform = require('stream').Transform;
const util = require('util');
const transformComponent = module.exports = function(options) {
if (!(this instanceof transformComponent))
return new Parser(options);
Transform.call(this, options);
};
util.inherits(transformComponent, Transform);
transformComponent.prototype._transform = function(data, encoding, callback) {
this.push(data);
callback();
};
transformComponent.prototype._flush = function(callback) {
callback();
};
ftpComponent.js
const Client = require('ftp');
var ftp = new Client();
var ftpComponent = function(host){
this.host = host;
this.port = 21;
this.user = "";
this.password = "";
};
function connectionProperties(){
let properties ={
host: this.host,
port: this.port
};
if(this.user && this.user!== "")
properties.user = this.user;
if(this.password && this.password !== "")
properties.password = this.password;
return properties;
}
function download(filepath, target){
ftp.on('ready', function () {
ftp.get(filepath, function(err, stream) {
if (err) throw err;
stream.once('close', function() { ftp.end(); });
stream.pipe(target);
});
});
ftp.connect(this.connectionProperties());
}
function upload(source, filename){
ftp.on('ready', function () {
// Upload files to the server:
ftp.put(source, filename, function(err) {
if (err) throw err;
ftp.end();
});
});
ftp.connect(this.connectionProperties());
}
ftpComponent.prototype = {
connectionProperties: connectionProperties,
pull : download,
push : upload
}
module.exports = ftpComponent;
My usage :
const ftp = require('./node_component/ftpComponent.js');
const transform = require('./node_component/transformComponent.js');
var ftpSourceObject = new ftp('host A');
var ftpTargetObject = new ftp('host B');
ftpSourceObject.user = usernameA;
ftpSourceObject.password = passwordA;
ftpTargetObject.user = usernameB;
ftpTargetObject.password = passwordB;
var temp = new transform();
ftpTargetObject.push(temp, 'file-cp.txt');
ftpSourceObject.pull('file.txt', temp);
I can write data into stream from FTP A.
But when reading data from stream and put on FTP B.
It shows the error like below.
Error: Unable to parse PASV server response
at Object.reentry [as cb] (/home/locadmin/fileshareservice/app/node_modules/ftp/lib/connection.js:857:19)
at Parser.<anonymous> (/home/locadmin/fileshareservice/app/node_modules/ftp/lib/connection.js:117:20)
at Parser.emit (events.js:182:13)
at Parser._write (/home/locadmin/fileshareservice/app/node_modules/ftp/lib/parser.js:59:10)
at doWrite (_stream_writable.js:410:12)
at writeOrBuffer (_stream_writable.js:394:5)
at Parser.Writable.write (_stream_writable.js:294:11)
at Socket.ondata (/home/locadmin/fileshareservice/app/node_modules/ftp/lib/connection.js:273:20)
at Socket.emit (events.js:182:13)
at addChunk (_stream_readable.js:283:12)
But when i run just a single line
var temp = new transform();
ftpTargetObject.push(temp, 'file-cp.txt');
temp.write('123');
temp.end();
//ftpSourceObject.pull('file.txt', temp);
It work successful.
How can I pass the stream as parameter to function??
Sorry for my poor English...
My source code reference source is https://bountify.co/node-js-script-for-copying-files-between-two-ftp-locations.

Answer 1

I fix it.
transformComponent.js
const Transform = require('stream').Transform;
const util = require('util');
const transformComponent = module.exports = function(options) {
if (!(this instanceof transformComponent))
return new Parser(options);
Transform.call(this, options);
};
util.inherits(transformComponent, Transform);
transformComponent.prototype._transform = function(data, encoding, callback) {
this.push(data);
callback();
};
transformComponent.prototype._flush = function(callback) {
callback();
};
ftpComponent.js
const Client = require('ftp');
var ftpComponent = function(host){
this.host = host;
this.port = 21;
this.user = "";
this.password = "";
};
function connectionProperties(){
let properties ={
host: this.host,
port: this.port
};
if(this.user && this.user!== "")
properties.user = this.user;
if(this.password && this.password !== "")
properties.password = this.password;
return properties;
}
function download(filepath, target){
var ftp = new Client();
ftp.on('ready', function () {
ftp.get(filepath, function(err, stream) {
if (err) throw err;
stream.once('close', function() { ftp.end(); });
stream.pipe(target);
});
});
ftp.connect(this.connectionProperties());
}
function upload(source, filename){
var ftp = new Client();
ftp.on('ready', function () {
// Upload files to the server:
ftp.put(source, filename, function(err) {
if (err) throw err;
ftp.end();
});
});
ftp.connect(this.connectionProperties());
}
ftpComponent.prototype = {
connectionProperties: connectionProperties,
pull : download,
push : upload
}
module.exports = ftpComponent;
My usage :
const ftp = require('./node_component/ftpComponent.js');
const transform = require('./node_component/transformComponent.js');
var ftpSourceObject = new ftp('host A');
var ftpTargetObject = new ftp('host B');
ftpSourceObject.user = usernameA;
ftpSourceObject.password = passwordA;
ftpTargetObject.user = usernameB;
ftpTargetObject.password = passwordB;
var temp = new transform();
ftpTargetObject.push(temp, 'file-cp.txt');
ftpSourceObject.pull('file.txt', temp);