mirror of
https://github.com/mofeng-git/One-KVM.git
synced 2025-12-12 09:10:30 +08:00
273 lines
9.0 KiB
Python
273 lines
9.0 KiB
Python
import os
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import struct
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import asyncio
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import types
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from typing import Dict
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from typing import NamedTuple
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from typing import Callable
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from typing import Type
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from typing import Optional
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from typing import Any
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import pyudev
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import aiofiles
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import aiofiles.base
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from .logging import get_logger
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# =====
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class MassStorageError(Exception):
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pass
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class IsNotOperationalError(MassStorageError):
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def __init__(self) -> None:
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super().__init__("Missing path for mass-storage device")
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class AlreadyConnectedToPcError(MassStorageError):
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def __init__(self) -> None:
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super().__init__("Mass-storage is already connected to Server")
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class AlreadyConnectedToKvmError(MassStorageError):
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def __init__(self) -> None:
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super().__init__("Mass-storage is already connected to KVM")
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class IsNotConnectedToKvmError(MassStorageError):
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def __init__(self) -> None:
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super().__init__("Mass-storage is not connected to KVM")
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class IsBusyError(MassStorageError):
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def __init__(self) -> None:
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super().__init__("Mass-storage is busy (write in progress)")
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class MassStorageDeviceInfo(NamedTuple):
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path: str
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real: str
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size: int
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image_name: str
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image_complete: bool
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manufacturer: str = ""
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product: str = ""
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serial: str = ""
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_DISK_META_SIZE = 4096
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_DISK_META_MAGIC_SIZE = 16
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_DISK_META_IMAGE_NAME_SIZE = 256
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_DISK_META_PADS_SIZE = _DISK_META_SIZE - _DISK_META_IMAGE_NAME_SIZE - 1 - _DISK_META_MAGIC_SIZE * 8
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_DISK_META_FORMAT = ">%dL%dc?%dx%dL" % (
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_DISK_META_MAGIC_SIZE,
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_DISK_META_IMAGE_NAME_SIZE,
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_DISK_META_PADS_SIZE,
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_DISK_META_MAGIC_SIZE,
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)
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_DISK_META_MAGIC = [0x1ACE1ACE] * _DISK_META_MAGIC_SIZE
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def _make_disk_meta(image_name: str, image_complete: bool) -> bytes:
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return struct.pack(
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_DISK_META_FORMAT,
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*_DISK_META_MAGIC,
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*memoryview(( # type: ignore
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image_name.encode("utf-8")
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+ b"\x00" * _DISK_META_IMAGE_NAME_SIZE
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)[:_DISK_META_IMAGE_NAME_SIZE]).cast("c"),
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image_complete,
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*_DISK_META_MAGIC,
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)
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def _parse_disk_meta(data: bytes) -> Dict:
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disk_meta = {
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"image_name": "",
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"image_complete": False,
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}
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try:
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parsed = list(struct.unpack(_DISK_META_FORMAT, data))
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except struct.error:
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pass
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else:
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magic_begin = parsed[:_DISK_META_MAGIC_SIZE]
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magic_end = parsed[-_DISK_META_MAGIC_SIZE:]
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if magic_begin == magic_end == _DISK_META_MAGIC:
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image_name_bytes = b"".join(parsed[_DISK_META_MAGIC_SIZE:_DISK_META_MAGIC_SIZE + _DISK_META_IMAGE_NAME_SIZE])
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disk_meta["image_name"] = image_name_bytes.decode("utf-8", errors="ignore").strip("\x00").strip()
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disk_meta["image_complete"] = parsed[_DISK_META_MAGIC_SIZE + _DISK_META_IMAGE_NAME_SIZE]
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return disk_meta
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def explore_device(device_path: str) -> Optional[MassStorageDeviceInfo]:
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# udevadm info -a -p $(udevadm info -q path -n /dev/sda)
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ctx = pyudev.Context()
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device = pyudev.Devices.from_device_file(ctx, device_path)
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if device.subsystem != "block":
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return None
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try:
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size = device.attributes.asint("size") * 512
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except KeyError:
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return None
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usb_device = device.find_parent("usb", "usb_device")
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with open(device_path, "rb") as device_file:
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device_file.seek(size - _DISK_META_SIZE)
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disk_meta = _parse_disk_meta(device_file.read())
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return MassStorageDeviceInfo( # type: ignore
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path=device_path,
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real=os.path.realpath(device_path),
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size=size,
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**disk_meta,
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**{
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attr: usb_device.attributes.asstring(attr).strip()
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for attr in ["manufacturer", "product", "serial"]
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if usb_device
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},
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)
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def _operated_and_locked(method: Callable) -> Callable:
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async def wrap(self: "MassStorageDevice", *args: Any, **kwargs: Any) -> Any:
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if self._device_file: # pylint: disable=protected-access
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raise IsBusyError()
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if not self._device_path: # pylint: disable=protected-access
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IsNotOperationalError()
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async with self._lock: # pylint: disable=protected-access
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return (await method(self, *args, **kwargs))
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return wrap
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class MassStorageDevice: # pylint: disable=too-many-instance-attributes
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def __init__(
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self,
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device_path: str,
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init_delay: float,
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write_meta: bool,
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loop: asyncio.AbstractEventLoop,
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) -> None:
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self._device_path = device_path
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self.__init_delay = init_delay
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self.__write_meta = write_meta
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self.__loop = loop
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self.__device_info: Optional[MassStorageDeviceInfo] = None
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self._lock = asyncio.Lock()
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self._device_file: Optional[aiofiles.base.AiofilesContextManager] = None
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self.__writed = 0
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logger = get_logger(0)
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if self._device_path:
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logger.info("Using %r as mass-storage device", self._device_path)
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try:
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logger.info("Enabled metadata writing")
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loop.run_until_complete(self.connect_to_kvm(no_delay=True))
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except Exception as err:
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if isinstance(err, MassStorageError):
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log = logger.error
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else:
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log = logger.exception
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log("Mass-storage device is not operational: %s", err)
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self._device_path = ""
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else:
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logger.warning("Mass-storage device is not operational")
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@_operated_and_locked
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async def connect_to_kvm(self, no_delay: bool=False) -> None:
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if self.__device_info:
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raise AlreadyConnectedToKvmError()
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# TODO: disable gpio
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if not no_delay:
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await asyncio.sleep(self.__init_delay)
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await self.__load_device_info()
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get_logger().info("Mass-storage device switched to KVM: %s", self.__device_info)
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@_operated_and_locked
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async def connect_to_pc(self) -> None:
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if not self.__device_info:
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raise AlreadyConnectedToPcError()
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# TODO: enable gpio
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self.__device_info = None
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get_logger().info("Mass-storage device switched to Server")
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def get_state(self) -> Dict:
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return {
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"in_operate": bool(self._device_path),
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"connected_to": ("kvm" if self.__device_info else "server"),
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"is_busy": bool(self._device_file),
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"writed": self.__writed,
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"info": (self.__device_info._asdict() if self.__device_info else None),
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}
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async def cleanup(self) -> None:
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async with self._lock:
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await self.__close_device_file()
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# TODO: disable gpio
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@_operated_and_locked
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async def __aenter__(self) -> "MassStorageDevice":
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if not self.__device_info:
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raise IsNotConnectedToKvmError()
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self._device_file = await aiofiles.open(self.__device_info.path, mode="w+b", buffering=0)
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self.__writed = 0
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return self
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async def write_image_meta(self, image_name: str, image_complete: bool) -> None:
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async with self._lock:
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assert self._device_file
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assert self.__device_info
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if self.__write_meta:
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if self.__device_info.size - self.__writed > _DISK_META_SIZE:
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await self._device_file.seek(self.__device_info.size - _DISK_META_SIZE)
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await self.__write_to_device_file(_make_disk_meta(image_name, image_complete))
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await self._device_file.seek(0)
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await self.__load_device_info()
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else:
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get_logger().error("Can't write image meta because device is full")
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async def write_image_chunk(self, chunk: bytes) -> int:
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async with self._lock:
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await self.__write_to_device_file(chunk)
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self.__writed += len(chunk)
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return self.__writed
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async def __aexit__(
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self,
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_exc_type: Type[BaseException],
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_exc: BaseException,
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_tb: types.TracebackType,
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) -> None:
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async with self._lock:
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await self.__close_device_file()
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async def __write_to_device_file(self, data: bytes) -> None:
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assert self._device_file
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await self._device_file.write(data)
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await self._device_file.flush()
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await self.__loop.run_in_executor(None, os.fsync, self._device_file.fileno())
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async def __load_device_info(self) -> None:
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device_info = await self.__loop.run_in_executor(None, explore_device, self._device_path)
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if not device_info:
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raise MassStorageError("Can't explore device %r" % (self._device_path))
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self.__device_info = device_info
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async def __close_device_file(self) -> None:
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try:
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if self._device_file:
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get_logger().info("Closing mass-storage device file ...")
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await self._device_file.close()
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except Exception:
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get_logger().exception("Can't close mass-storage device file")
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# TODO: reset device file
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self._device_file = None
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self.__writed = 0
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