Class: Rack::StaticCache

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/contrib/static_cache.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ StaticCache

Returns a new instance of StaticCache.



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# File 'lib/rack/contrib/static_cache.rb', line 52

def initialize(app, options={})
  @app = app
  @urls = options[:urls]
  @no_cache = {}
  @urls.collect! do |url|
    if url  =~ /\*$/
      url.sub!(/\*$/, '')
      @no_cache[url] = 1
    end
    url
  end
  root = options[:root] || Dir.pwd
  @file_server = Rack::File.new(root)
  @cache_duration = options[:duration] || 1
  @versioning_enabled = options.fetch(:versioning, true)
  if @versioning_enabled
    @version_regex = options.fetch(:version_regex, /-[\d.]+([.][a-zA-Z][\w]+)?$/)
  end
  @duration_in_seconds = self.duration_in_seconds
  @duration_in_words    = self.duration_in_words
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/contrib/static_cache.rb', line 74

def call(env)
  path = env["PATH_INFO"]
  url = @urls.detect{ |u| path.index(u) == 0 }
  if url.nil?
    @app.call(env)
  else
    if @versioning_enabled
      path.sub!(@version_regex, '\1')
    end
    status, headers, body = @file_server.call(env)
    if @no_cache[url].nil?
      headers['Cache-Control'] ="max-age=#{@duration_in_seconds}, public"
      headers['Expires'] = @duration_in_words
    end
    [status, headers, body]
  end
end

#duration_in_seconds ⇒ Object 



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# File 'lib/rack/contrib/static_cache.rb', line 96

def duration_in_seconds
  (60 * 60 * 24 * 365 * @cache_duration).to_i
end

#duration_in_words ⇒ Object 



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# File 'lib/rack/contrib/static_cache.rb', line 92

def duration_in_words
  (Time.now + self.duration_in_seconds).strftime '%a, %d %b %Y %H:%M:%S GMT'
end