Source code for spinnman.messages.scp.abstract_messages.bmp_response
# Copyright (c) 2015 The University of Manchester
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from logging import getLogger
from typing import Generic, Optional, TypeVar, final
from spinn_utilities.abstract_base import abstractmethod
from spinn_utilities.log import FormatAdapter
from spinn_utilities.overrides import overrides
from spinnman.messages.scp.enums import SCPCommand, SCPResult
from spinnman.exceptions import SpinnmanUnexpectedResponseCodeException
from .scp_response import AbstractSCPResponse
logger = FormatAdapter(getLogger(__name__))
#: :meta private:
T = TypeVar("T")
class BMPResponse(AbstractSCPResponse, Generic[T]):
"""
Represents an SCP response that's tailored for the BMP connection.
"""
__slots__ = ("__operation", "__command", "__value")
def __init__(self, operation: str, command: SCPCommand):
super().__init__()
self.__operation = operation
self.__command = command
self.__value: Optional[T] = None
@property
def _value(self) -> T:
"""
The value parsed from the message. Subclasses have to expose this to
make the parsed payload visible.
"""
if self.__value is None:
raise ValueError("no value parsed yet")
return self.__value
[docs]
@overrides(AbstractSCPResponse.read_data_bytestring)
def read_data_bytestring(self, data: bytes, offset: int):
result = self.scp_response_header.result
if result != SCPResult.RC_OK:
raise SpinnmanUnexpectedResponseCodeException(
self.__operation, self.__command.name, result.name)
self.__value = self._parse_payload(data, offset)
@abstractmethod
def _parse_payload(self, data: bytes, offset: int) -> T:
"""
Parse the payload of the message. The header will already be OK.
:param data:
The full content of the message
:param offset:
Where the payload should start in the message
:return:
The parsed payload
"""
raise NotImplementedError
@final
class BMPOKResponse(BMPResponse[None]):
"""
A BMP response without payload to parse.
"""
@abstractmethod
def _parse_payload(self, data: bytes, offset: int) -> None:
if len(data) != offset:
logger.warning("response message with unexpected extra {} bytes",
len(data) - offset)
return None
@property
def _value(self) -> None:
# Override to remove None check; this is always None
return None