class ActionDispatch::Response::Buffer

def abort
end

def body
  @str_body ||= begin
    buf = +""
    each { |chunk| buf << chunk }
    buf
  end
end

def close
  @response.commit!
  @closed = true
end

def closed?
  @closed
end

def each(&block)
  if @str_body
    return enum_for(:each) unless block_given?
    yield @str_body
  else
    each_chunk(&block)
  end
end

def each_chunk(&block)
  @buf.each(&block)
end

def initialize(response, buf)
  @response = response
  @buf      = buf
  @closed   = false
  @str_body = nil
end

def write(string)
  raise IOError, "closed stream" if closed?
  @str_body = nil
  @response.commit!
  @buf.push string
end