131 lines
4.4 KiB
Python
131 lines
4.4 KiB
Python
import aiohttp
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import asyncio
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import json
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from . import parser
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from . block import Block
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from . worker import ExtractWorker
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from . patch import Patch
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from ... import config
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from ... paramgen import arcparam
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from concurrent.futures import CancelledError
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from urllib.parse import quote
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headers = config.headers
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REPLAY_URL = "https://www.youtube.com/live_chat_replay/" \
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"get_live_chat_replay?continuation="
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def _split(start, end, count, min_interval_sec = 120):
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"""
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Split section from `start` to `end` into `count` pieces,
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and returns the beginning of each piece.
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The `count` is adjusted so that the length of each piece
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is no smaller than `min_interval`.
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Returns:
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--------
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List of the offset of each block's first chat data.
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"""
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if not (isinstance(start,int) or isinstance(start,float)) or \
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not (isinstance(end,int) or isinstance(end,float)):
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raise ValueError("start/end must be int or float")
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if not isinstance(count,int):
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raise ValueError("count must be int")
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if start>end:
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raise ValueError("end must be equal to or greater than start.")
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if count<1:
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raise ValueError("count must be equal to or greater than 1.")
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if (end-start)/count < min_interval_sec:
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count = int((end-start)/min_interval_sec)
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if count == 0 : count = 1
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interval= (end-start)/count
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if count == 1:
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return [start]
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return sorted( list(set( [int(start + interval*j)
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for j in range(count) ])))
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def ready_blocks(video_id, duration, div, callback):
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if div <= 0: raise ValueError
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async def _get_blocks( video_id, duration, div, callback):
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async with aiohttp.ClientSession() as session:
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tasks = [_create_block(session, video_id, seektime, callback)
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for seektime in _split(-1, duration, div)]
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return await asyncio.gather(*tasks)
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async def _create_block(session, video_id, seektime, callback):
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continuation = arcparam.getparam(video_id, seektime = seektime)
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url = f"{REPLAY_URL}{quote(continuation)}&pbj=1"
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async with session.get(url, headers = headers) as resp:
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text = await resp.text()
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next_continuation, actions = parser.parse(json.loads(text))
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if actions:
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first = parser.get_offset(actions[0])
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last = parser.get_offset(actions[-1])
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if callback:
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callback(actions,last-first)
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return Block(
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continuation = next_continuation,
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chat_data = actions,
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first = first,
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last = last
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)
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"""
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fetch initial blocks.
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"""
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loop = asyncio.get_event_loop()
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blocks = loop.run_until_complete(
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_get_blocks(video_id, duration, div, callback))
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return blocks
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def fetch_patch(callback, blocks, video_id):
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async def _allocate_workers():
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workers = [
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ExtractWorker(
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fetch = _fetch, block = block,
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blocks = blocks, video_id = video_id
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)
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for block in blocks
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]
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async with aiohttp.ClientSession() as session:
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tasks = [worker.run(session) for worker in workers]
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return await asyncio.gather(*tasks)
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async def _fetch(continuation,session) -> Patch:
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url = f"{REPLAY_URL}{quote(continuation)}&pbj=1"
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async with session.get(url,headers = config.headers) as resp:
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chat_json = await resp.text()
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continuation, actions = parser.parse(json.loads(chat_json))
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if actions:
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last = parser.get_offset(actions[-1])
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first = parser.get_offset(actions[0])
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if callback:
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callback(actions, last - first)
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return Patch(actions, continuation, first, last)
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return Patch(continuation = continuation)
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"""
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allocate workers and assign blocks.
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"""
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loop = asyncio.get_event_loop()
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try:
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loop.run_until_complete(_allocate_workers())
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except CancelledError:
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pass
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async def _shutdown():
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print("\nshutdown...")
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tasks = [t for t in asyncio.all_tasks()
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if t is not asyncio.current_task()]
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for task in tasks:
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task.cancel()
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try:
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await task
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except asyncio.CancelledError:
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pass
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def cancel():
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loop = asyncio.get_event_loop()
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loop.create_task(_shutdown())
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