mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-29 21:03:45 +03:00
f5f0c84553
Reduce abstraction leaks. Now the transport can hold any state, rather than just the tag. It's also responsible to initialize on the first connection, and they can be cleanly reset. asyncio connections are no longer used, in favour of raw sockets, which should avoid some annoyances. For the time being, more obscure transport modes have been removed, as well as proxy support, until further cleaning is done.
42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
from .transport import Transport
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import struct
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from zlib import crc32
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class Full(Transport):
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def __init__(self):
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self._send_counter = 0
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self._recv_counter = 0
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def recreate_fresh(self):
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return type(self)()
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def pack(self, input: bytes) -> bytes:
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# https://core.telegram.org/mtproto#tcp-transport
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length = len(input) + 12
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data = struct.pack('<ii', length, self._send_counter) + input
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crc = struct.pack('<I', crc32(data))
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self._send_counter += 1
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return data + crc
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def unpack(self, input: bytes) -> (int, bytes):
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if len(input) < 12:
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raise EOFError()
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length, seq = struct.unpack('<ii', input[:8])
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if len(input) < length:
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raise EOFError()
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if seq != self._recv_counter:
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raise ValueError(f'expected sequence value {self._recv_counter!r}, got {seq!r}')
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body = input[8:length - 4]
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checksum = struct.unpack('<I', input[length - 4:length])[0]
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valid_checksum = crc32(input[:length - 4])
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if checksum != valid_checksum:
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raise InvalidChecksumError(checksum, valid_checksum)
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self._recv_counter += 1
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return length, body
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