Module: RackPipeline::Caching

Included in:
Base
Defined in:
lib/rack-pipeline/caching.rb

Instance Method Summary collapse

Instance Method Details

#cache_target(source, target) ⇒ Object 



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# File 'lib/rack-pipeline/caching.rb', line 6

def cache_target(source, target)
  ensure_temp_directory
  caller_method = caller.first[/`([^']*)'/, 1]
  extname = File.extname(target)
  target_filename = File.basename(target).sub(/[0-9a-f]{32}\./,'').chomp(extname) << '.' << caller_method
  target_path = File.join(settings[:temp], target_filename + '.' << calculate_hash(source) << extname)
  if File.file?(target_path)
    target_path
  else
    cleanup_cache(target_filename << '.*' << extname)
    yield target_path
  end
end

#calculate_hash(sources) ⇒ Object 



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# File 'lib/rack-pipeline/caching.rb', line 36

def calculate_hash(sources)
  Digest::MD5.hexdigest(Array(sources).inject(''){ |all,(file,_)| all << file << File.mtime(file).to_i.to_s })
end

#cleanup_cache(target) ⇒ Object 



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# File 'lib/rack-pipeline/caching.rb', line 31

def cleanup_cache(target)
  @busted = true
  FileUtils.rm Dir.glob(File.join(settings[:temp], target))
end

#ensure_temp_directory ⇒ Object 



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# File 'lib/rack-pipeline/caching.rb', line 20

def ensure_temp_directory
  temp = settings[:temp]
  return temp if temp.kind_of?(String) && File.directory?(temp)
  unless temp
    require 'tmpdir'
    temp = File.join(Dir.tmpdir, 'RackPipeline')
  end
  FileUtils.mkdir_p temp
  settings[:temp] = temp
end