Class: RedSnapper

Inherits:
Object
  • Object
show all
Defined in:
lib/redsnapper.rb

Defined Under Namespace

Classes: Group

Constant Summary collapse

TARSNAP = 
'tarsnap'
THREAD_POOL_DEFAULT_SIZE = 
10
EXIT_ERROR = 
"tarsnap: Error exit delayed from previous errors.\n"
@@output_mutex = 
Mutex.new

Instance Method Summary collapse

Constructor Details

#initialize(archive, options = {}) ⇒ RedSnapper

Returns a new instance of RedSnapper.



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# File 'lib/redsnapper.rb', line 27

def initialize(archive, options = {})
  @archive = archive
  @options = options
  @thread_pool = Thread.pool(options[:thread_pool_size] || THREAD_POOL_DEFAULT_SIZE)
  @error = false
end

Instance Method Details

#file_groups ⇒ Object 



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# File 'lib/redsnapper.rb', line 73

def file_groups
  groups = (1..@thread_pool.max).map { Group.new }
  file_sizes.sort { |a, b| b.last <=> a.last }.each do |file|
    groups.sort.last.add(*file)
  end
  groups.map(&:files)
end

#file_sizes ⇒ Object 



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# File 'lib/redsnapper.rb', line 34

def file_sizes
  return @sizes if @sizes
  
  command = [ TARSNAP, '-tvf', @archive, *@options[:tarsnap_options] ]
  command.push(@options[:directory]) if @options[:directory]

  @sizes = {}
  dirs = Set.new

  Open3.popen3(*command) do |_, out, _|
    out.gets(nil).split("\n").each do |entry|
      (_, _, _, _, size, _, _, _, name) = entry.split(/\s+/, 9)
      if name.end_with?('/')
        dirs.add(name)
      else
        @sizes[name] = size.to_i
      end
    end
  end

  empty_dirs = dirs.clone
  @sizes.each { |f, _| empty_dirs.delete(File.dirname(f) + '/') }

  dirs.each do |dir|
    components = dir.split('/')[0..-2]
    components.each_with_index do |_, i|
      empty_dirs.delete(components[0, i + 1].join('/') + '/')
    end
  end

  empty_dirs.each { |dir| @sizes[dir] = 0 }

  @sizes
end

#files ⇒ Object 



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# File 'lib/redsnapper.rb', line 69

def files
  @files ||= file_sizes.keys
end

#run ⇒ Object 



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# File 'lib/redsnapper.rb', line 81

def run
  file_groups.each do |chunk|
    @thread_pool.process do
      command = [ TARSNAP, '-xvf', @archive, *(@options[:tarsnap_options] + chunk) ]
      Open3.popen3(*command) do |_, _, err|
        while line = err.gets
          if line == EXIT_ERROR
            @error = true
            next
          end
          @@output_mutex.synchronize { warn line.chomp }
        end
      end
    end
  end

  @thread_pool.shutdown
  @@output_mutex.synchronize { warn EXIT_ERROR } if @error
end