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
19 # make this a no-op under Rubinius, it's pointless anyways
20 # since Rubinius doesn't have IO.copy_stream
23 end if defined?(RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
26 # Rack middleware entry point, we'll just pass through responses
27 # unless they respond to +to_io+ or +to_path+
29 status, headers, body = response = app.call(env)
31 # totally uninteresting to us if there's no body
32 if STATUS_WITH_NO_ENTITY_BODY.include?(status.to_i) ||
34 (body.respond_to?(:to_path) && File.file?(body.to_path))
38 io = body.to_io if body.respond_to?(:to_io)
39 io ||= File.open(body.to_path) if body.respond_to?(:to_path)
40 return response if io.nil?
42 headers = HeaderHash.new(headers)
47 headers['Content-Length'] ||= st.size.to_s
48 headers.delete('Transfer-Encoding')
49 elsif st.pipe? || st.socket? # epoll-able things
50 unless headers['Content-Length']
51 if env['rainbows.autochunk']
52 headers['Transfer-Encoding'] = 'chunked'
54 headers['X-Rainbows-Autochunk'] = 'no'
58 # we need to make sure our pipe output is Fiber-compatible
59 case env["rainbows.model"]
60 when :FiberSpawn, :FiberPool, :RevFiberSpawn, :CoolioFiberSpawn
61 io.respond_to?(:kgio_wait_readable) or
62 io = Rainbows::Fiber::IO.new(io)
64 io = Rainbows::Revactor::Proxy.new(io)
66 else # unlikely, char/block device file, directory, ...
69 [ status, headers, Body.new(io, "/dev/fd/#{fileno}", body) ]
72 class Body < Struct.new(:to_io, :to_path, :orig_body)
73 # called by the webserver or other middlewares if they can't
79 # remain Rack::Lint-compatible for people with wonky systems :P
80 unless File.directory?("/dev/fd")
81 alias to_path_orig to_path
85 # called by the web server after #each
87 to_io.close unless to_io.closed?
88 orig_body.close if orig_body.respond_to?(:close) # may not be an IO
89 rescue IOError # could've been IO::new()'ed and closed