class DwcaHunter::Downloader

Attributes

url[R]

Public Class Methods

new(source_url, file_path) click to toggle source
# File lib/dwca_hunter/downloader.rb, line 7
def initialize(source_url, file_path)
  @source_url = source_url
  @file_path = file_path
  @url = Url.new(source_url)
  @download_length = 0
  @filename = nil
end

Public Instance Methods

download() { |download_length| ... } click to toggle source

downloads a given file into a specified filename. If block is given returns download progress

# File lib/dwca_hunter/downloader.rb, line 17
def download
  raise "#{@source_url} is not accessible" unless @url.valid?
  f = open(@file_path,'wb')
  count = 0
  @url.net_http.request_get(@url.path) do |r|
    r.read_body do |s|
      @download_length += s.length
      f.write s
      if block_given?
        count += 1
        if count % 100 == 0
          yield @download_length
        end
      end
    end
  end
  f.close
  downloaded = @download_length
  @download_length = 0
  downloaded
end
download_with_percentage() { |res| ... } click to toggle source
# File lib/dwca_hunter/downloader.rb, line 39
def download_with_percentage
  start_time = Time.now
  download do |r|
    percentage = r.to_f/@url.header.content_length * 100
    elapsed_time = Time.now - start_time
    eta = calculate_eta(percentage, elapsed_time)
    res = { percentage: percentage,
            elapsed_time: elapsed_time,
            eta: eta }
    yield res
  end
end

Protected Instance Methods

calculate_eta(percentage, elapsed_time) click to toggle source
# File lib/dwca_hunter/downloader.rb, line 54
def calculate_eta(percentage, elapsed_time)
  eta = elapsed_time/percentage * 100 - elapsed_time
  eta = 1.0 if eta <= 0
  eta
end