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# -*- coding: utf-8 -*-
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import asyncio
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import datetime
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import logging
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import re
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from typing import *
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import aiohttp
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import sqlalchemy
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import sqlalchemy.exc
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import models.database
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logger = logging.getLogger(__name__)
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DEFAULT_AVATAR_URL = '//static.hdslb.com/images/member/noface.gif'
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_main_event_loop = asyncio.get_event_loop()
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_http_session = aiohttp.ClientSession()
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# user_id -> avatar_url
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_avatar_url_cache: Dict[int, str] = {}
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# 正在获取头像的Future，user_id -> Future
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_uid_fetch_future_map: Dict[int, asyncio.Future] = {}
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# 正在获取头像的user_id队列
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_uid_queue_to_fetch = asyncio.Queue(15)
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# 上次被B站ban时间
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_last_fetch_banned_time: Optional[datetime.datetime] = None
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def init():
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asyncio.ensure_future(_get_avatar_url_from_web_consumer())
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async def get_avatar_url(user_id):
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avatar_url = get_avatar_url_from_memory(user_id)
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if avatar_url is not None:
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return avatar_url
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avatar_url = await get_avatar_url_from_database(user_id)
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if avatar_url is not None:
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return avatar_url
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avatar_url = await get_avatar_url_from_web(user_id)
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if avatar_url is not None:
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return avatar_url
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return DEFAULT_AVATAR_URL
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def get_avatar_url_from_memory(user_id):
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return _avatar_url_cache.get(user_id, None)
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def get_avatar_url_from_database(user_id) -> Awaitable[Optional[str]]:
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return asyncio.get_event_loop().run_in_executor(
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None, _do_get_avatar_url_from_database, user_id
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)
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def _do_get_avatar_url_from_database(user_id):
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try:
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with models.database.get_session() as session:
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user = session.query(BilibiliUser).filter(BilibiliUser.uid == user_id).one_or_none()
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if user is None:
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return None
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avatar_url = user.avatar_url
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# 如果离上次更新太久就更新所有缓存
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if (datetime.datetime.now() - user.update_time).days >= 3:
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def refresh_cache():
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_avatar_url_cache.pop(user_id, None)
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get_avatar_url_from_web(user_id)
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_main_event_loop.call_soon(refresh_cache)
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else:
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# 否则只更新内存缓存
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_update_avatar_cache_in_memory(user_id, avatar_url)
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except sqlalchemy.exc.OperationalError:
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# SQLite会锁整个文件，忽略就行
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return None
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except sqlalchemy.exc.SQLAlchemyError:
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logger.exception('_do_get_avatar_url_from_database failed:')
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return None
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return avatar_url
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def get_avatar_url_from_web(user_id) -> Awaitable[Optional[str]]:
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# 如果已有正在获取的future则返回，防止重复获取同一个uid
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future = _uid_fetch_future_map.get(user_id, None)
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if future is not None:
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return future
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# 否则创建一个获取任务
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_uid_fetch_future_map[user_id] = future = _main_event_loop.create_future()
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future.add_done_callback(lambda _future: _uid_fetch_future_map.pop(user_id, None))
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try:
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_uid_queue_to_fetch.put_nowait(user_id)
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except asyncio.QueueFull:
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future.set_result(None)
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return future
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async def _get_avatar_url_from_web_consumer():
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while True:
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try:
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user_id = await _uid_queue_to_fetch.get()
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future = _uid_fetch_future_map.get(user_id, None)
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if future is None:
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continue
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# 防止在被ban的时候获取
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global _last_fetch_banned_time
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if _last_fetch_banned_time is not None:
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cur_time = datetime.datetime.now()
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if (cur_time - _last_fetch_banned_time).total_seconds() < 3 * 60 + 3:
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# 3分钟以内被ban，解封大约要15分钟
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future.set_result(None)
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continue
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else:
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_last_fetch_banned_time = None
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asyncio.ensure_future(_get_avatar_url_from_web_coroutine(user_id, future))
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# 限制频率，防止被B站ban
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await asyncio.sleep(0.2)
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except:
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logger.exception('_get_avatar_url_from_web_consumer error:')
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async def _get_avatar_url_from_web_coroutine(user_id, future):
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try:
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avatar_url = await _do_get_avatar_url_from_web(user_id)
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except BaseException as e:
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future.set_exception(e)
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else:
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future.set_result(avatar_url)
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async def _do_get_avatar_url_from_web(user_id):
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try:
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async with _http_session.get('https://api.bilibili.com/x/space/acc/info',
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params={'mid': user_id}) as r:
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if r.status != 200:
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logger.warning('Failed to fetch avatar: status=%d %s uid=%d', r.status, r.reason, user_id)
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if r.status == 412:
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# 被B站ban了
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global _last_fetch_banned_time
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_last_fetch_banned_time = datetime.datetime.now()
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return None
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data = await r.json()
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except (aiohttp.ClientConnectionError, asyncio.TimeoutError):
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return None
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avatar_url = process_avatar_url(data['data']['face'])
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update_avatar_cache(user_id, avatar_url)
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return avatar_url
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def process_avatar_url(avatar_url):
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# 去掉协议，兼容HTTP、HTTPS
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m = re.fullmatch(r'(?:https?:)?(.*)', avatar_url)
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if m is not None:
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avatar_url = m[1]
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# 缩小图片加快传输
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if not avatar_url.endswith('noface.gif'):
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avatar_url += '@48w_48h'
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return avatar_url
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def update_avatar_cache(user_id, avatar_url):
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_update_avatar_cache_in_memory(user_id, avatar_url)
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asyncio.get_event_loop().run_in_executor(
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None, _update_avatar_cache_in_database, user_id, avatar_url
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)
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def _update_avatar_cache_in_memory(user_id, avatar_url):
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_avatar_url_cache[user_id] = avatar_url
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while len(_avatar_url_cache) > 50000:
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_avatar_url_cache.pop(next(iter(_avatar_url_cache)), None)
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def _update_avatar_cache_in_database(user_id, avatar_url):
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try:
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with models.database.get_session() as session:
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user = session.query(BilibiliUser).filter(BilibiliUser.uid == user_id).one_or_none()
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if user is None:
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user = BilibiliUser(uid=user_id, avatar_url=avatar_url,
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update_time=datetime.datetime.now())
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session.add(user)
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else:
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user.avatar_url = avatar_url
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user.update_time = datetime.datetime.now()
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session.commit()
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except (sqlalchemy.exc.OperationalError, sqlalchemy.exc.IntegrityError):
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# SQLite会锁整个文件，忽略就行，另外还有多线程导致ID重复的问题
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pass
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except sqlalchemy.exc.SQLAlchemyError:
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logger.exception('_update_avatar_cache_in_database failed:')
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class BilibiliUser(models.database.OrmBase):
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__tablename__ = 'bilibili_users'
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uid = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True)
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avatar_url = sqlalchemy.Column(sqlalchemy.Text)
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update_time = sqlalchemy.Column(sqlalchemy.DateTime)
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