Class: Condenser::BrotliWriter

Inherits:
Object
  • Object
show all
Defined in:
lib/condenser/writers/brotli_writer.rb

Overview

Generates a ‘.br` file using the Brotli algorithm with the brotli gem

Constant Summary collapse

COMPRESSALBE_TEXT_TYPES =

What mime types should we compress? This list comes from: www.fastly.com/blog/new-gzip-settings-and-deciding-what-compress

%w( text/html application/x-javascript text/css
application/javascript text/javascript text/plain text/xml
application/json application/xml image/svg+xml)
COMPRESSALBE_FONT_TYPES = 
%w( application/vnd.ms-fontobject
application/x-font-opentype application/x-font-truetype
application/x-font-ttf font/eot font/opentype font/otf)
COMPRESSALBE_GENERIC_TYPES = 
%w( image/vnd.microsoft.icon image/x-icon )
ADDED_MIME_TYPES = 
['application/brotli']

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mime_types: nil, added_mime_types: nil) ⇒ BrotliWriter

Returns a new instance of BrotliWriter.



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# File 'lib/condenser/writers/brotli_writer.rb', line 21

def initialize(mime_types: nil, added_mime_types: nil)
  @mime_types = mime_types || (COMPRESSALBE_TEXT_TYPES + COMPRESSALBE_FONT_TYPES + COMPRESSALBE_GENERIC_TYPES)
  @added_mime_types = added_mime_types || ADDED_MIME_TYPES
end

Instance Attribute Details

#added_mime_types ⇒ Object (readonly)

Returns the value of attribute added_mime_types.



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# File 'lib/condenser/writers/brotli_writer.rb', line 19

def added_mime_types
  @added_mime_types
end

#mime_types ⇒ Object (readonly)

Returns the value of attribute mime_types.



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# File 'lib/condenser/writers/brotli_writer.rb', line 19

def mime_types
  @mime_types
end

Instance Method Details

#call(output_directory, asset) ⇒ Object 



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# File 'lib/condenser/writers/brotli_writer.rb', line 44

def call(output_directory, asset)
  filename = File.join(output_directory, "#{asset.path}.br")
  FileUtils.mkdir_p(File.dirname(filename))
  Condenser::Utils.atomic_write(filename) do |file|
    file.write(Brotli.deflate(asset.source, {
      mode: mode_for_mime_type(asset.content_types.last),
      quality: 11
      # lgwin: 10-24
      # lgblock: 16-24 think bigger more compression but more mem
    }))
  end
  
  ["#{asset.filename}.br"]
end

#exist?(asset) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/condenser/writers/brotli_writer.rb', line 30

def exist?(asset)
  ::File.exist?(path(asset))
end

#mode_for_mime_type(mime_type) ⇒ Object 



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# File 'lib/condenser/writers/brotli_writer.rb', line 34

def mode_for_mime_type(mime_type)
  if COMPRESSALBE_TEXT_TYPES.include?(mime_type)
    :text
  elsif COMPRESSALBE_FONT_TYPES.include?(mime_type)
    :font
  else
    :generic
  end
end

#path(asset) ⇒ Object 



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# File 'lib/condenser/writers/brotli_writer.rb', line 26

def path(asset)
  "#{asset.path}.br"
end