69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
from typing import Any, ClassVar, Type
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from ..datainputstream import DataInputStream
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class Packet:
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REGISTRY: ClassVar[dict[int, Type['Packet']]] = {}
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FIELDS: ClassVar[list[tuple[str, Any]]] = []
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PACKET_ID: ClassVar[int] = 0x00
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def __init__(self, **params):
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for k, v in params.items():
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setattr(self, k, v)
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@classmethod
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def read_from(cls, stream: DataInputStream) -> 'Packet':
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fields: dict = {}
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for key, datatype in cls.FIELDS:
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fields[key] = cls.read_field(stream, datatype)
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return cls(**fields)
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@staticmethod
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def read_field(stream: DataInputStream, datatype: Any):
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match datatype:
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case 'uint':
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return stream.read_uint()
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case 'int':
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return stream.read_int()
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case 'str':
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return stream.read_string()
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case 'str', length:
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return stream.read_string()[:length]
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case 'ulong':
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return stream.read_ulong()
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case 'long':
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return stream.read_long()
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case 'ushort':
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return stream.read_ushort()
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case 'short':
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return stream.read_short()
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case 'byte':
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return stream.read_byte()
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case 'float':
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return stream.read_float()
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case 'double':
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return stream.read_double()
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case 'bool':
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return stream.read_boolean()
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case 'bytes', length:
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return stream.read_bytes(length)
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case _:
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raise ValueError(f'unknown type {datatype}')
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def __init_subclass__(cls) -> None:
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Packet.REGISTRY[cls.PACKET_ID] = cls
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@classmethod
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def parse_packet(cls, stream: DataInputStream) -> 'Packet':
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packet_id: int = stream.read_byte()
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if packet_id not in cls.REGISTRY:
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stream._cursor -= 1
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raise ValueError(f'invalid packet 0x{packet_id:02x}')
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return cls.REGISTRY[packet_id].read_from(stream)
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def __repr__(self):
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pkt_name = self.REGISTRY[self.PACKET_ID].__name__
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fields = []
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for name, _ in self.FIELDS:
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fields.append(f'{name}={getattr(self, name)!r}')
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return f'<{pkt_name} {str.join(", ", fields)}'
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