class FtpTool

 def initialize()

  @current_ftp = create_ftp

 end

 

 def fetch_remote_filenames(source)

  return [] if source.blank?

  log_info("source is " + source)

  filenames = @current_ftp.nlst(source)

  filenames

 end

 def get(origin_file)

  local_file = local_file(origin_file)

  local_file.gsub("\\", "\\\\") #此处注意是window下执行， 在linux下需要注意改成/

  log_info("Ftp Get: #{origin_file} -> #{local_file}")

  begin

   @current_ftp.getbinaryfile(origin_file, local_file+".tmp")

  rescue

   delete_local_file(local_file+".tmp")

  end

  rename_local_file(local_file+".tmp", local_file) if File.exist?(local_file+".tmp")

 end

def put(origin_file, remote_path)

  return nil if not File.exist?(origin_file)

  _file_name = File.basename(origin_file)

  _root = @current_ftp.getdir

  @current_ftp.chdir(remote_path)

  log_info("Ftp put: #{origin_file} -> #{remote_path}")

  begin

   @current_ftp.putbinaryfile(origin_file, remote_path + _file_name + ".tmp")

  rescue

   delete(remote_path + _file_name + ".tmp")

  end

  @current_ftp.chdir(_root)

  rename(remote_path + _file_name + ".tmp", remote_path + _file_name)

 end

 

 def close

  @current_ftp.close if @current_ftp

 end

 

 def copy(origin_file, file_path)

  local_file = local_file(origin_file)

  _file_name = File.basename(origin_file)

  begin

 log_info("FTP get file to:" + local_file+".tmp")

   @current_ftp.getbinaryfile(origin_file, local_file+".tmp")

   return nil if not File.exist?(local_file+".tmp")

  log_info("FTP put file to :" + file_path + _file_name + ".tmp")

   @current_ftp.putbinaryfile(local_file+".tmp", file_path + _file_name + ".tmp")

   #3. 改名字

   rename(file_path + _file_name + ".tmp", file_path + _file_name)

   #5. 删除本地

   delete_local_file(local_file + ".tmp")

  rescue => e

   log_info(e)

   #4. 删除服务器上临时文件

   delete(file_path + origin_file + ".tmp")

   #5. 删除本地

   delete_local_file(local_file + ".tmp")

  end

 end

 def move(origin_file, file_path)

  _file_name = File.basename(origin_file)

  begin

   copy(origin_file, file_path)

   # 删除服务器上源文件

   delete(origin_file)

  rescue => e

   log_info(e)

   # 删除临时文件，如果存在

   delete(file_path + _file_name + ".tmp")

   # 删除服务器上目标文件， 如果存在

   delete(file_path + _file_name)

  end

 end

 def rename(origin_file, file)

  if not @current_ftp.list(origin_file).blank?

   log_info("FTP rename #{origin_file} to #{file}")

   @current_ftp.rename(origin_file, file)

  end

 end

 

 def delete(origin_file)

  if not @current_ftp.list(origin_file).blank?

   log_info("FTP delete #{origin_file}")

   @current_ftp.delete(origin_file)

  end

 end

 

 def closed?

  @current_ftp.closed?

 end

 

 class << self

 def convert(src_file, dest_file, from_encode, to_encode )

   log_info("Convert #{src_file} to #{dest_file}")

   cd = Iconv.new(to_encode, from_encode)

   File.open(dest_file, "w") do |out|

    File.open(src_file) do |in_stream|

     in_stream.each_line do |line|

      begin

       new_line = cd.iconv(line)

       out.write(new_line)

      rescue => e

       log_info "convert line error : #{line}"

       next

      end

     end

    end

   end

   cd.close

   dest_file

  end

 end

 

 protected

 def create_ftp

  require "net/ftp"

  ftp = Net::FTP.new

  ftp.connect(ftp_host, ftp_port)

  ftp.login(ftp_user, ftp_pwd)

  ftp.passive = ftp_mode

  ftp

 end

 

def local_file(file)

  local = File.join("tmp/", file)

  FileUtils.makedirs(File.dirname(local))

  local

 end

 

 def delete_local_file(file)

  if File.exist?(file)

   log_info("delete local file : " + file)

   File.delete(file)

  end

 end

 

 def rename_local_file(origin_file, file)

  if File.exist?(origin_file)

   log_info("rename local file : " + origin_file + " to " + file)

   File.rename(origin_file, file)

  end

 end

 

 def ftp_host; "x.x.x.x" end

 def ftp_port; "21" end

 def ftp_user; "x" end

 def ftp_pwd ; "x" end

 def ftp_mode; true end

end