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