class Rack::Cache::Context

# File lib/rack/cache/context.rb, line 18
def initialize(backend, options={})
  @backend = backend
  @trace = []
  @env = nil
  @options = options

  initialize_options options
  yield self if block_given?

  @private_header_keys =
    private_headers.map { |name| "HTTP_#{name.upcase.tr('-', '_')}" }
end

# File lib/rack/cache/context.rb, line 48
def call(env)
  if env['rack.run_once'] && !env['rack.multithread']
    call! env
  else
    clone.call! env
  end
end

# File lib/rack/cache/context.rb, line 58
def call!(env)
  @trace = []
  @default_options.each { |k,v| env[k] ||= v }
  @env = env
  @request = Request.new(@env.dup.freeze)

  response =
    if @request.get? || @request.head?
      if !@env['HTTP_EXPECT'] && !@env['rack-cache.force-pass']
        lookup
      else
        pass
      end
    else
      if @request.options?
        pass
      else
        invalidate
      end
    end

  # log trace and set x-rack-cache tracing header
  trace = @trace.join(', ')
  response.headers['x-rack-cache'] = trace

  # write log message to rack.errors
  if verbose?
    message = "cache: [%s %s] %s\n" %
      [@request.request_method, @request.fullpath, trace]
    log_info(message)
  end

  # tidy up response a bit
  if (@request.get? || @request.head?) && not_modified?(response)
    response.not_modified!
  end

  if @request.head?
    response.body.close if response.body.respond_to?(:close)
    response.body = []
  end
  response.to_a
end

# File lib/rack/cache/context.rb, line 40
def entitystore
  uri = options['rack-cache.entitystore']
  storage.resolve_entitystore_uri(uri, @options)
end

# File lib/rack/cache/context.rb, line 33
def metastore
  uri = options['rack-cache.metastore']
  storage.resolve_metastore_uri(uri, @options)
end