Class: Lcms::Engine::GenerateThumbnails

Inherits:
Object
  • Object
show all
Defined in:
app/services/lcms/engine/generate_thumbnails.rb

Constant Summary collapse

MEDIAS =

to keep only (facebook pinterest)

SocialThumbnail::MEDIAS.slice(1, 2)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(resource) ⇒ GenerateThumbnails

Returns a new instance of GenerateThumbnails.



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 10

def initialize(resource)
  @resource = resource
  FileUtils.mkdir_p tmp_dir
end

Instance Attribute Details

#resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 6

def resource
  @resource
end

Instance Method Details

#convert_to_png(file_path) ⇒ Object 



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 45

def convert_to_png(file_path)
  tmp_path = file_path.to_s.gsub('.svg', '.tmp.png')
  png_path = file_path.to_s.gsub('.svg', '.png')
  `svgexport #{file_path} #{tmp_path}`
  `pngquant #{tmp_path} -o #{png_path} --speed=1 --force`
  png_path
end

#generate ⇒ Object 



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 15

def generate
  MEDIAS.each do |media|
    file_path = tmp_dir.join("#{resource_type}_#{resource.id}_#{media}.svg")
    # generate tmp svg file
    File.open(file_path, 'w') { |f| f.write(svg_content(media)) }
    # convert to png
    png_path = convert_to_png(file_path)

    # save thumbnail to s3
    thumb = SocialThumbnail.find_or_initialize_by(media: media.to_sym, target: resource)
    thumb.image = File.open(png_path)
    thumb.save
  end
  # clean tmp image files
  files = Dir.glob(tmp_dir.join "#{resource_type}_#{resource.id}_*.*")
  FileUtils.rm files
end

#resource_type ⇒ Object 



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 37

def resource_type
  resource.class.name.underscore
end

#svg_content(media) ⇒ Object 



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 41

def svg_content(media)
  SVGSocialThumbnail.new(resource, media: media).render
end

#tmp_dir ⇒ Object 



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# File 'app/services/lcms/engine/generate_thumbnails.rb', line 33

def tmp_dir
  Rails.root.join('tmp', 'svgs')
end