Beispiel #1
0
func parseBinaryCommand(parser *parser, buf *streambuf.Buffer) parseResult {
	debug("on binary message")

	if !buf.Avail(memcacheHeaderSize) {
		return parser.needMore()
	}

	msg := parser.message
	msg.isBinary = true
	magic, _ := buf.ReadNetUint8At(0)
	switch magic {
	case MemcacheMagicRequest:
		msg.IsRequest = true
	case MemcacheMagicResponse:
		msg.IsRequest = false
	default:
		return parser.failing(ErrInvalidMemcacheMagic)
	}

	opcode, _ := buf.ReadNetUint8At(1)
	keyLen, err := buf.ReadNetUint16At(2)
	extraLen, _ := buf.ReadNetUint8At(4)
	if err != nil {
		return parser.failing(err)
	}

	debug("magic: %v", magic)
	debug("opcode: %v", opcode)
	debug("extra len: %v", extraLen)
	debug("key len: %v", keyLen)

	totalHeaderLen := memcacheHeaderSize + int(extraLen) + int(keyLen)
	debug("total header len: %v", totalHeaderLen)
	if !buf.Avail(totalHeaderLen) {
		return parser.needMore()
	}

	command := memcacheBinaryCommandTable[memcacheOpcode(opcode)]
	if command == nil {
		debug("unknown command")
		command = binaryUnknownCommand
	}

	msg.opcode = memcacheOpcode(opcode)
	msg.command = command
	msg.isQuiet = isQuietOpcode(msg.opcode)
	return parser.contWithShallow(buf, command.parse)
}