Class: ImageOptim::Cache

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

Overview

Handles image cache

Instance Method Summary collapse

Constructor Details

#initialize(image_optim, workers_by_format) ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/image_optim/cache.rb', line 10

def initialize(image_optim, workers_by_format)
  return unless image_optim.cache_dir

  @cache_dir = FSPath.new(image_optim.cache_dir)
  @cache_worker_digests = image_optim.cache_worker_digests
  @options_by_format = Hash[workers_by_format.map do |format, workers|
    [format, workers.map(&:inspect).sort.join(', ')]
  end]
  @bins_by_format = Hash[workers_by_format.map do |format, workers|
    [format, workers.map(&:used_bins).flatten!.map! do |sym|
      bin = image_optim.resolve_bin!(sym)
      "#{bin.name}[#{bin.digest}]"
    end.sort!.uniq.join(', ')]
  end]
  @global_options = begin
    options = {}
    options[:timeout] = image_optim.timeout if image_optim.timeout
    options.empty? ? '' : options.inspect
  end
end

Instance Method Details

#fetch(original) ⇒ Object 



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# File 'lib/image_optim/cache.rb', line 31

def fetch(original)
  return yield unless @cache_dir

  digest = digest(original, original.image_format)
  cached = @cache_dir / digest
  return cached.size? && CachePath.convert(cached) if cached.file?

  optimized = yield

  cached.dirname.mkpath

  if optimized
    tmp = FSPath.temp_file_path(digest, @cache_dir)
    FileUtils.mv(optimized, tmp)
    tmp.chmod(~File.umask & 0o666)
    tmp.rename(cached)
    cached_path = CachePath.convert(cached)

    # mark cached image as already optimized
    cached = @cache_dir / digest(cached, original.image_format)
    cached.dirname.mkpath
    FileUtils.touch(cached)

    cached_path
  else
    # mark image as already optimized
    FileUtils.touch(cached)
    nil
  end
end