old_contents: from __future__ import absolute_import
  
  from ..parser import read_number
  from ..parser import write_number
  
  from .types import Types
  from .call_request import CallRequestMessage
  
  
  class CallResponseMessage(CallRequestMessage):
      """Respond to an RPC call."""
      message_type = Types.CALL_RES
  
      __slots__ = (
          'flags',
          'code',
  
          # Zipkin-style tracing data
          'span_id',
          'parent_id',
          'trace_id',
  
          'traceflags',
  
          'headers',
          'checksum_type',
          'checksum',
  
          'arg_1',
          'arg_2',
          'arg_3',
      )
  
      CODE_SIZE = 1
  
      def parse(self, payload, size):
          """Parse a call request message from a payload."""
          self.flags = read_number(payload, self.FLAGS_SIZE)
          self.code = read_number(payload, self.CODE_SIZE)
  
          self.parse_trace(payload)
          self.headers, _ = self._read_headers(
              payload,
              self.NH_SIZE,
              self.HEADER_SIZE,
          )
  
          self.checksum_type = read_number(payload, self.CSUMTYPE_SIZE)
          if self.checksum_type:
              csum_size = self.CHECKSUM[self.checksum_type]
              self.checksum = read_number(payload, csum_size)
  
          self.parse_args(payload)
          self.extra_space_check(payload)
  
      def serialize(self, out):
          """Write a call request message out to a buffer."""
          out.extend(write_number(self.flags, self.FLAGS_SIZE))
          out.extend(write_number(self.code, self.code_SIZE))
  
          self.serialize_trace(out)
          self.serialize_header_and_checksum(out)
          self.serialize_args(out)
  
new_contents: from __future__ import absolute_import
  
  from ..parser import read_number
  from ..parser import write_number
  
  from .types import Types
  from .call_request import CallRequestMessage
  
  
  class CallResponseMessage(CallRequestMessage):
      """Respond to an RPC call."""
      message_type = Types.CALL_RES
  
      __slots__ = (
          'flags',
          'code',
  
          # Zipkin-style tracing data
          'span_id',
          'parent_id',
          'trace_id',
  
          'traceflags',
  
          'headers',
          'checksum_type',
          'checksum',
  
          'arg_1',
          'arg_2',
          'arg_3',
      )
  
      CODE_SIZE = 1
  
      def parse(self, payload, size):
          """Parse a call request message from a payload."""
          self.flags = read_number(payload, self.FLAGS_SIZE)
          self.code = read_number(payload, self.CODE_SIZE)
  
          self.parse_trace(payload)
          self.headers, _ = self._read_headers(
              payload,
              self.NH_SIZE,
              self.HEADER_SIZE,
          )
  
          self.checksum_type = read_number(payload, self.CSUMTYPE_SIZE)
          if self.checksum_type:
              csum_size = self.CHECKSUM[self.checksum_type]
              self.checksum = read_number(payload, csum_size)
  
          self.parse_args(payload)
          self.extra_space_check(payload)
  
      def serialize(self, out):
          """Write a call request message out to a buffer."""
          out.extend(write_number(self.flags, self.FLAGS_SIZE))
          out.extend(write_number(self.code, self.CODE_SIZE))
  
          self.serialize_trace(out)
          self.serialize_header_and_checksum(out)
          self.serialize_args(out)
  
subject: fix typo in code size