47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
import socket
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import struct
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from abc import ABC, abstractmethod
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from source.network.packet.abc import Packet
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class VariableLengthBytesPacket(Packet, ABC):
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"""
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A Packet that represent a single value that can be encoded with a variable length.
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The property "data" and the method "from_bytes" need to be defined.
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"""
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packet_format: str = ">I"
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@property
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@abstractmethod
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def data(self) -> bytes:
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pass
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def to_bytes(self) -> bytes:
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data: bytes = self.data
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data_len: int = len(data)
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# envoie la taille du message, suivi des données du message
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return struct.pack(f"{self.packet_format}{data_len}s", data_len, data)
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@classmethod
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@abstractmethod
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def from_bytes(cls, data: bytes):
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pass
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@classmethod
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def from_connection(cls, connection: socket.socket) -> "Packet":
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data_len, *_ = struct.unpack(
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cls.packet_format,
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connection.recv(struct.calcsize(cls.packet_format))
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)
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format_: str = f">{data_len}s"
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data, *_ = struct.unpack(
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format_,
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connection.recv(struct.calcsize(format_))
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)
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return cls.from_bytes(data)
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