Class: PrestoHTTP::Response

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# File 'lib/presto/http/response/response.rb', line 11

def call env, &proc

  # if proc given, it will be executed instead of action
  @given_proc = proc
  @path_params = []

  catch :__presto_catch_response__ do

    rewrite env

    map, found = @controller.ctrl.map[@route]||{}, false
    if @action = map[env['REQUEST_METHOD']] || map[:*]

      @action_params = params_extracted
      @params_min, @params_max = params_required
      @path_params = params_given env['PATH_INFO'].to_s

      found = params_valid?
    else
      @action = map.values.first
    end

    @controller_instance = @controller.new(@action, env)

    if found
      sweep_sessions # should always precede auth

      if authenticated?

        @controller_instance.http.content_type content_type
        body = yield_action.to_s

        if encoding = encoding()
          body = body.force_encoding encoding
          @controller_instance.http.content_type '%s; charset=%s' % [
              @controller_instance.http.content_type,
              encoding]
        end

        @controller_instance.http.body [body]

      end

    else

      error = ::Presto.setup.error.not_found(@route, @controller, @action, *@path_params)
      @controller_instance.http.error STATUS__NOT_FOUND, error

    end
    @controller_instance.http.finish
  end
end

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# File 'lib/presto/http/response/action.rb', line 69

def exec_action

  api = nil
  if sandbox_capabilities = @controller_instance.http.sandbox_capabilities
    api = @controller_instance.http
    # replace HTTP API with a confined version
    @controller_instance.http @controller_instance.http.sandbox(*sandbox_capabilities)
  end

  result = @controller_instance.send(@action, *@path_params)

  # restoring HTTP API
  @controller_instance.http(api) if api

  result
end

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# File 'lib/presto/http/response/params.rb', line 75

def params_extracted
  @controller.instance_method(@action).parameters
end

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# File 'lib/presto/http/response/params.rb', line 16

def params_given path
  path.split('/').map { |s| s if s.size > 0 }.compact
end

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# File 'lib/presto/http/response/params.rb', line 50

def params_required

  min, max = 0, @action_params.size

  unlimited = false
  @action_params.each_with_index do |setup, i|

    increment = setup[0] == :req ? true : false

    if param = @action_params.values_at(i+1)[0]
      increment = true if param[0] == :req
    end

    if setup[0] == :rest
      increment = false
      unlimited = true
    end

    min += 1 if increment
  end
  max = nil if unlimited
  [min, max]
end

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# File 'lib/presto/http/response/params.rb', line 7

def params_valid?
  min_valid = @path_params.size >= @params_min
  max_valid = @params_max ? (@path_params.size <= @params_max) : true
  min_valid && max_valid
end

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# File 'lib/presto/http/response/action.rb', line 9

def yield_action
  begin
    hooks_a, hooks_z = hooks
    # Important! hooks ever executed, regardless cache.
    hooks_a.each { |hook| @controller_instance.instance_exec(*@path_params, &hook) }

    body = @given_proc ?
        @controller_instance.instance_exec(*@path_params, &@given_proc) :
        yield_action_body

    hooks_z.each { |hook| @controller_instance.instance_exec(*@path_params, &hook) }

    body
  rescue => e
    @controller_instance.http.error STATUS__SERVER_ERROR, ::Presto.setup.error.fatal_error(e)
  end
end

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# File 'lib/presto/http/response/action.rb', line 30

def yield_action_body

  proc = @controller.http.cache(@action)
  return exec_action unless proc &&
      instruction = @controller_instance.instance_exec(*@path_params, &proc)

  # building cache key from route and arguments.
  # each action may have multiple cached versions.
  # consider:
  #    http.cache(:content) { true }
  #    def content page, layout = 'default'
  #    end
  # now, any of links above will have own cache:
  #    /content/
  #    /content/1
  #    /content/1/summary
  cache_uniq = [@controller_instance.http.action_route, *@path_params].join('/')
  cache_pool = @controller.http.cache_pool
  cache = cache_pool.get(@controller) { Hash.new }

  case instruction
    when :truncate, :purge
      # got instruction to purge cache for current controller
      cache = Hash.new
    when :update
      # got instruction to purge cache for current action
      cache.delete cache_uniq
  end

  unless response = cache[cache_uniq]
    cache[cache_uniq] = (response = exec_action)
    cache_pool[@controller] = cache
  end
  response
end