create module FTP

lib/tasks/import_csv.rake

-require 'net/ftp'
 require 'rubygems'
-require 'zip'
 
 namespace :import do
   desc 'Import CSV'
   task csv: :environment do
     thread_count = ENV['THREAD_COUNT'] || 1
 
-    ftp = Net::FTP.new
-    ftp.connect('192.168.1.156')
-    ftp.login('training', 'training')
-    ftp.passive = true
-    files = ftp.nlst('*.zip')
-
     path_zip = "#{Rails.root}/lib/tasks/jobs.zip"
-    files.each do |file_name|
-      ftp.getbinaryfile(file_name, path_zip)
-    end
-
-    ftp.close
+    Utils::Download.new('192.168.1.156', 'training', 'training', path_zip, '*.zip').download_ftp
 
     path_csv = "#{Rails.root}/lib/tasks/jobs.csv"
     Zip::File.open(path_zip) do |zipfile|

lib/utils/download.rb

+require 'net/ftp'
+require 'zip'
+
+class Utils::Download
+  attr_reader :url, :user, :password, :path, :file_type
+
+  def initialize(url, user, password, path, file_type)
+    @url = url
+    @user = user
+    @password = password
+    @path = path
+    @file_type = file_type
+  end
+
+  def download_ftp
+    ftp = Net::FTP.new
+    ftp.connect(@url)
+    ftp.login(@user, @password)
+    ftp.passive = true
+    files = ftp.nlst(@file_type)
+
+    files.each do |file_name|
+      ftp.getbinaryfile(file_name, @path)
+    end
+
+    ftp.close
+  end
+end