Class: Baykit::BayServer::Docker::Http::H2::H2PacketUnPacker

Inherits:
Protocol::PacketUnPacker
  • Object
show all
Includes:
Agent, Baykit::BayServer::Docker::Http, Protocol, Util
Defined in:
lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb

Defined Under Namespace

Classes: FrameHeaderItem

Constant Summary collapse

STATE_READ_LENGTH = 
1
STATE_READ_TYPE = 
2
STATE_READ_FLAGS = 
3
STATE_READ_STREAM_IDENTIFIER = 
4
STATE_READ_FLAME_PAYLOAD = 
5
STATE_END = 
6
FRAME_LEN_LENGTH = 
3
FRAME_LEN_TYPE = 
1
FRAME_LEN_FLAGS = 
1
FRAME_LEN_STREAM_IDENTIFIER = 
4
FLAGS_END_STREAM = 
0x1
FLAGS_END_HEADERS = 
0x4
FLAGS_PADDED = 
0x8
FLAGS_PRIORITY = 
0x20
CONNECTION_PREFACE = 
"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cmd_unpacker, pkt_store, server_mode) ⇒ H2PacketUnPacker

Returns a new instance of H2PacketUnPacker.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 70

def initialize(cmd_unpacker, pkt_store, server_mode)
  @cmd_unpacker = cmd_unpacker
  @pkt_store = pkt_store
  @server_mode = server_mode
  @tmp_buf = SimpleBuffer.new
  reset
end

Instance Attribute Details

#cmd_unpacker ⇒ Object (readonly)

Returns the value of attribute cmd_unpacker.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 62

def cmd_unpacker
  @cmd_unpacker
end

#cont_len ⇒ Object (readonly)

Returns the value of attribute cont_len.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 66

def cont_len
  @cont_len
end

#flags ⇒ Object (readonly)

Returns the value of attribute flags.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 59

def flags
  @flags
end

#item ⇒ Object (readonly)

Returns the value of attribute item.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 55

def item
  @item
end

#payload_len ⇒ Object (readonly)

Returns the value of attribute payload_len.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 58

def payload_len
  @payload_len
end

#pkt_store ⇒ Object (readonly)

Returns the value of attribute pkt_store.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 63

def pkt_store
  @pkt_store
end

#pos ⇒ Object (readonly)

Returns the value of attribute pos.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 68

def pos
  @pos
end

#preface_read ⇒ Object (readonly)

Returns the value of attribute preface_read.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 56

def preface_read
  @preface_read
end

#read_bytes ⇒ Object (readonly)

Returns the value of attribute read_bytes.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 67

def read_bytes
  @read_bytes
end

#server_mode ⇒ Object (readonly)

Returns the value of attribute server_mode.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 64

def server_mode
  @server_mode
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 53

def state
  @state
end

#stream_id ⇒ Object (readonly)

Returns the value of attribute stream_id.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 60

def stream_id
  @stream_id
end

#tmp_buf ⇒ Object (readonly)

Returns the value of attribute tmp_buf.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 54

def tmp_buf
  @tmp_buf
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 57

def type
  @type
end

Instance Method Details

#bytes_received(buf) ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 95

def bytes_received(buf)
  suspend = false

  @pos = 0
  if @server_mode && !@preface_read
    len = CONNECTION_PREFACE.length - @tmp_buf.length
    if len > buf.length
      len = buf.length
    end
    @tmp_buf.put(buf, @pos, len)
    @pos += len
    if @tmp_buf.length == CONNECTION_PREFACE.length
      @tmp_buf.length.times do |i|
        if CONNECTION_PREFACE[i] != @tmp_buf.buf[i]
          raise ProtocolException.new "Invalid connection preface: #{@tmp_buf.bytes[0, @tmp_buf.length]}"
        end
      end
      pkt = @pkt_store.rent(H2Type::PREFACE)
      pkt.new_data_accessor().put_bytes(@tmp_buf.buf, 0, @tmp_buf.length)
      nstat = @cmd_unpacker.packet_received(pkt)
      @pkt_store.Return(pkt)
      if nstat != NextSocketAction::CONTINUE
        return nstat
      end

      BayLog.debug("h2: Connection preface OK")
      @preface_read = true
      @tmp_buf.reset()
    end
  end

  while @state != STATE_END && pos < buf.length
    case @state
    when STATE_READ_LENGTH
      if read_header_item(buf)
        @payload_len = ((@item.get(@tmp_buf, 0) & 0xFF) << 16 |
                        (@item.get(@tmp_buf, 1) & 0xFF) << 8 |
                        (@item.get(@tmp_buf, 2) & 0xFF))
        @item = FrameHeaderItem.new(@tmp_buf.length, FRAME_LEN_TYPE)
        change_state STATE_READ_TYPE
      end

    when STATE_READ_TYPE
      if read_header_item(buf)
        @type = @item.get(@tmp_buf, 0)
        @item = FrameHeaderItem.new(@tmp_buf.length, FRAME_LEN_FLAGS)
        change_state STATE_READ_FLAGS
      end

    when STATE_READ_FLAGS
      if read_header_item(buf)
        @flags = @item.get(@tmp_buf, 0)
        @item = FrameHeaderItem.new(@tmp_buf.length, FRAME_LEN_STREAM_IDENTIFIER)
        change_state STATE_READ_STREAM_IDENTIFIER
      end

    when STATE_READ_STREAM_IDENTIFIER
      if read_header_item(buf)
        @stream_id =
          ((@item.get(@tmp_buf, 0) & 0x7F) << 24) |
            (@item.get(@tmp_buf, 1) << 16) |
            (@item.get(@tmp_buf, 2) << 8) |
            @item.get(@tmp_buf, 3)

        @item = FrameHeaderItem.new(@tmp_buf.length, @payload_len)
        change_state STATE_READ_FLAME_PAYLOAD
      end

    when STATE_READ_FLAME_PAYLOAD
      if read_header_item(buf)
        change_state STATE_END
      end

    else
      raise RuntimeError.new "Illegal State"

    end

    if @state == STATE_END
      pkt = @pkt_store.rent(@type)
      pkt.stream_id = @stream_id
      pkt.flags = H2Flags.new(@flags)
      pkt.new_header_accessor().put_bytes(@tmp_buf.buf, 0, H2Packet::FRAME_HEADER_LEN)
      pkt.new_data_accessor().put_bytes(@tmp_buf.buf, H2Packet::FRAME_HEADER_LEN, @tmp_buf.length - H2Packet::FRAME_HEADER_LEN)

      begin
        next_act = @cmd_unpacker.packet_received(pkt)
      ensure
        @pkt_store.Return(pkt)
        reset_state()
      end

      if next_act == NextSocketAction::SUSPEND
        suspend = true
      elsif next_act != NextSocketAction::CONTINUE
        return next_act
      end
    end
  end

  if suspend
    return NextSocketAction::SUSPEND
  else
    return NextSocketAction::CONTINUE
  end
end

#reset ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 78

def reset()
  reset_state()
  @preface_read = false
end

#reset_state ⇒ Object 



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# File 'lib/baykit/bayserver/docker/http/h2/h2_packet_unpacker.rb', line 83

def reset_state()
  change_state STATE_READ_LENGTH
  @item = FrameHeaderItem.new(0, FRAME_LEN_LENGTH)
  @cont_len = 0
  @read_bytes = 0
  @tmp_buf.reset
  @type = nil
  @flags = 0
  @stream_id = 0
  @payload_len = 0
end