51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
import math
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import logging
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import asyncio
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from telethon import TelegramClient, utils
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from telethon.sessions import StringSession
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class Client(TelegramClient):
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def __init__(self, session_string, *args, **kwargs):
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super().__init__(StringSession(session_string), *args, **kwargs)
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self.log = logging.getLogger(__name__)
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async def download(self, file, file_size, offset, limit):
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part_size = utils.get_appropriated_part_size(file_size) * 1024
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first_part_cut = offset % part_size
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first_part = math.floor(offset / part_size)
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last_part_cut = part_size - (limit % part_size)
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last_part = math.ceil(limit / part_size)
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part_count = math.ceil(file_size / part_size)
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part = first_part
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self.log.debug(
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f"""Request Details
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part_size(bytes) = {part_size},
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first_part = {first_part}, cut = {first_part_cut}(length={part_size-first_part_cut}),
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last_part = {last_part}, cut = {last_part_cut}(length={last_part_cut}),
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parts_count = {part_count}
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"""
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)
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try:
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async for chunk in self.iter_download(
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file, offset=first_part * part_size, request_size=part_size
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):
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self.log.debug(f"Part {part}/{last_part} (total {part_count}) served!")
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if part == first_part:
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yield chunk[first_part_cut:]
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elif part == last_part:
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yield chunk[:last_part_cut]
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break
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else:
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yield chunk
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part += 1
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self.log.debug(f"serving finished")
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except (GeneratorExit, StopAsyncIteration, asyncio.CancelledError):
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self.log.debug("file serve interrupted")
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raise
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except Exception:
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self.log.debug("file serve errored", exc_info=True)
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