lib/rainbows/event_machine/client.rb

   1 # -*- encoding: binary -*-
   2 # :enddoc:
   3 class Rainbows::EventMachine::Client < EM::Connection
   4   include Rainbows::EvCore
   5   Rainbows.config!(self, :keepalive_timeout)
   6
   7   def initialize(io)
   8     @_io = io
   9     @deferred = nil
  10   end
  11
  12   alias write send_data
  13   alias hijacked detach
  14
  15   def receive_data(data)
  16     # To avoid clobbering the current streaming response
  17     # (often a static file), we do not attempt to process another
  18     # request on the same connection until the first is complete
  19     if @deferred
  20       if data
  21         @buf << data
  22         @_io.shutdown(Socket::SHUT_RD) if @buf.size > 0x1c000
  23       end
  24       EM.next_tick { receive_data(nil) } unless @buf.empty?
  25     else
  26       on_read(data || Z) if (@buf.size > 0) || data
  27     end
  28   end
  29
  30   def quit
  31     super
  32     close_connection_after_writing if nil == @deferred
  33   end
  34
  35   def app_call input
  36     set_comm_inactivity_timeout 0
  37     @env[RACK_INPUT] = input
  38     @env[REMOTE_ADDR] = @_io.kgio_addr
  39     @env[ASYNC_CALLBACK] = method(:write_async_response)
  40     @env[ASYNC_CLOSE] = EM::DefaultDeferrable.new
  41     @hp.hijack_setup(@env, @_io)
  42     status, headers, body = catch(:async) {
  43       APP.call(@env.merge!(RACK_DEFAULTS))
  44     }
  45     return hijacked if @hp.hijacked?
  46
  47     if (nil == status || -1 == status)
  48       @deferred = true
  49     else
  50       ev_write_response(status, headers, body, @hp.next?)
  51     end
  52   end
  53
  54   def deferred_errback(orig_body)
  55     @deferred.errback do
  56       orig_body.close if orig_body.respond_to?(:close)
  57       @deferred = nil
  58       quit
  59     end
  60   end
  61
  62   def deferred_callback(orig_body, alive)
  63     @deferred.callback do
  64       orig_body.close if orig_body.respond_to?(:close)
  65       @deferred = nil
  66       alive ? receive_data(nil) : quit
  67     end
  68   end
  69
  70   def ev_write_response(status, headers, body, alive)
  71     @state = :headers if alive
  72     if body.respond_to?(:errback) && body.respond_to?(:callback)
  73       write_headers(status, headers, alive, body) or return hijacked
  74       @deferred = body
  75       write_body_each(body)
  76       deferred_errback(body)
  77       deferred_callback(body, alive)
  78       return
  79     elsif body.respond_to?(:to_path)
  80       st = File.stat(path = body.to_path)
  81
  82       if st.file?
  83         write_headers(status, headers, alive, body) or return hijacked
  84         @deferred = stream_file_data(path)
  85         deferred_errback(body)
  86         deferred_callback(body, alive)
  87         return
  88       elsif st.socket? || st.pipe?
  89         chunk = stream_response_headers(status, headers, alive, body)
  90         return hijacked if nil == chunk
  91         io = body_to_io(@deferred = body)
  92         m = chunk ? Rainbows::EventMachine::ResponseChunkPipe :
  93                     Rainbows::EventMachine::ResponsePipe
  94         return EM.watch(io, m, self).notify_readable = true
  95       end
  96       # char or block device... WTF? fall through to body.each
  97     end
  98     write_response(status, headers, body, alive) or return hijacked
  99     if alive
 100       if @deferred.nil?
 101         if @buf.empty?
 102           set_comm_inactivity_timeout(KEEPALIVE_TIMEOUT)
 103         else
 104           EM.next_tick { receive_data(nil) }
 105         end
 106       end
 107     else
 108       quit unless @deferred
 109     end
 110   end
 111
 112   def next!
 113     @deferred.close if @deferred.respond_to?(:close)
 114     @deferred = nil
 115     @hp.keepalive? ? receive_data(nil) : quit
 116   end
 117
 118   def unbind
 119     return if @hp.hijacked?
 120     async_close = @env[ASYNC_CLOSE] and async_close.succeed
 121     @deferred.respond_to?(:fail) and @deferred.fail
 122     begin
 123       @_io.close
 124     rescue Errno::EBADF
 125       # EventMachine's EventableDescriptor::Close() may close
 126       # the underlying file descriptor without invalidating the
 127       # associated IO object on errors, so @_io.closed? isn't
 128       # sufficient.
 129     end
 130   end
 131 end