Class: FileReplicator::Splitter

Inherits:
Object
  • Object
show all
Includes:
ReplicatorHelper
Defined in:
lib/file_replicator/splitter.rb

Constant Summary

Constants included from ReplicatorHelper

ReplicatorHelper::READ_BUFFER

Instance Attribute Summary

Attributes included from ReplicatorHelper

#checksum, #colour, #options

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Splitter

Returns a new instance of Splitter.



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# File 'lib/file_replicator/splitter.rb', line 12

def initialize
  @options = SplitterCmdParse.new.get_options
  @colour  = Pastel.new enabled: !@options[:no_colour]

  if (alg = @options.to_h.fetch(:checksum, false))
    @checksum = Checksum.new alg
  end
end

Instance Method Details

#split ⇒ Object 



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# File 'lib/file_replicator/splitter.rb', line 21

def split
  file_no = 0
  files   = Dir.glob(File.expand_path(options[:files])).sort
  files.each do |file_name|
    file_no       += 1
    file_abs_path = File.expand_path(file_name)
    file_size     = File.size(file_abs_path)

    next if options.min_size? and file_size < size_in_bytes(options[:min_size])

    if options.size?
      split_size         = size_in_bytes options[:size]
      number_of_elements = (file_size.to_f / split_size).ceil
    elsif options.elements?
      split_size         = (file_size.to_f / options[:elements]).ceil
      number_of_elements = options[:elements]
    end

    if progress?
      file_pb = ProgressBar.create(
          total: number_of_elements,
          title: colour.bright_blue("#{File.basename file_name}")
      )
    end

    @checksum.start_new_file File.join(options[:output_dir],
                                       File.basename(file_name)) if chksum?

    File.open file_abs_path, 'rb' do |f|
      file_split_no = 0

      until f.eof? or f.closed?
        file_split_no    += 1
        output_file_path = File.join(
            options[:output_dir],
            self.class.pattern_to_path(
                options[:pattern],
                file_path:    file_abs_path,
                file_number:  file_no,
                chunk_number: file_split_no,
                max_elements: number_of_elements
            ))

        prepare output_file_path

        bytes_written = 0
        begin
          # write to chunk file
          @checksum.start_new_chunk output_file_path if chksum?
          split_file = File.open output_file_path, 'ab'
          while bytes_written <= split_size and (data = f.read(READ_BUFFER))
            split_file.write data
            bytes_written += READ_BUFFER
            @checksum.add_chunk data if chksum?
          end
        rescue StandardError => e
          puts colour.bright_red e.message unless quiet?
          f.close
          file_pb.stop if progress?
          exit 1
        ensure
          split_file.close unless split_file.nil?
          file_pb.increment if progress?
          @checksum.append_chunk_checksum if chksum?
        end
      end
    end

    file_pb.finish if progress?
    @checksum.append_file_checksum if chksum?

  end

end