1 # -*- encoding: binary -*-
3 # Rack response middleware wrapping any IO-like object with an
4 # OS-level file descriptor associated with it. May also be used to
5 # create responses from integer file descriptors or existing +IO+
6 # objects. This may be used in conjunction with the #to_path method
7 # on servers that support it to pass arbitrary file descriptors into
8 # the HTTP response without additional open(2) syscalls
10 # This middleware is currently a no-op for Rubinius, as it lacks
11 # IO.copy_stream in 1.9 and also due to a bug here:
12 # http://github.com/evanphx/rubinius/issues/379
14 class Rainbows::DevFdResponse < Struct.new(:app)
17 FD_MAP = Rainbows::FD_MAP
18 Content_Length = "Content-Length".freeze
19 Transfer_Encoding = "Transfer-Encoding".freeze
20 Rainbows_autochunk = "rainbows.autochunk".freeze
21 Rainbows_model = "rainbows.model"
23 HTTP_VERSION = "HTTP_VERSION"
26 # make this a no-op under Rubinius, it's pointless anyways
27 # since Rubinius doesn't have IO.copy_stream
30 end if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
33 # Rack middleware entry point, we'll just pass through responses
34 # unless they respond to +to_io+ or +to_path+
36 status, headers, body = response = app.call(env)
38 # totally uninteresting to us if there's no body
39 if STATUS_WITH_NO_ENTITY_BODY.include?(status.to_i) ||
41 (body.respond_to?(:to_path) && File.file?(body.to_path))
45 io = body.to_io if body.respond_to?(:to_io)
46 io ||= File.open(body.to_path) if body.respond_to?(:to_path)
47 return response if io.nil?
49 headers = Rack::Utils::HeaderHash.new(headers) unless Hash === headers
54 headers[Content_Length] ||= st.size.to_s
55 headers.delete(Transfer_Encoding)
56 elsif st.pipe? || st.socket? # epoll-able things
57 unless headers.include?(Content_Length)
58 if env[Rainbows_autochunk] && HTTP_1_0 != env[HTTP_VERSION]
59 headers[Transfer_Encoding] = Chunked
61 env[Rainbows_autochunk] = false
65 # we need to make sure our pipe output is Fiber-compatible
66 case env[Rainbows_model]
67 when :FiberSpawn, :FiberPool, :RevFiberSpawn, :CoolioFiberSpawn
68 io.respond_to?(:kgio_wait_readable) or
69 io = Rainbows::Fiber::IO.new(io)
71 io = Rainbows::Revactor::Proxy.new(io)
73 else # unlikely, char/block device file, directory, ...
76 [ status, headers, Body.new(io, "/dev/fd/#{fileno}", body) ]
79 class Body < Struct.new(:to_io, :to_path, :orig_body)
80 # called by the webserver or other middlewares if they can't
86 # remain Rack::Lint-compatible for people with wonky systems :P
87 unless File.directory?("/dev/fd")
88 alias to_path_orig to_path
92 # called by the web server after #each
94 to_io.close unless to_io.closed?
95 orig_body.close if orig_body.respond_to?(:close) # may not be an IO
96 rescue IOError # could've been IO::new()'ed and closed