获取头像接口封装成类

config.py

@@ -55,7 +55,6 @@ class AppConfig:
         self.open_browser_at_startup = True
         self.enable_upload_file = True
 
-        self.fetch_avatar_interval = 5.5
         self.fetch_avatar_max_queue_size = 1
         self.avatar_cache_size = 10000
 
@@ -86,7 +85,6 @@ class AppConfig:
                                                               fallback=self.open_browser_at_startup)
         self.enable_upload_file = app_section.getboolean('enable_upload_file', fallback=self.enable_upload_file)
 
-        self.fetch_avatar_interval = app_section.getfloat('fetch_avatar_interval', fallback=self.fetch_avatar_interval)
         self.fetch_avatar_max_queue_size = app_section.getint('fetch_avatar_max_queue_size',
                                                               fallback=self.fetch_avatar_max_queue_size)
         self.avatar_cache_size = app_section.getint('avatar_cache_size', fallback=self.avatar_cache_size)

data/config.example.ini

@@ -24,13 +24,9 @@ open_browser_at_startup = true
 enable_upload_file = true
 
 
-# 获取头像间隔时间（秒）。如果小于5秒有很大概率被服务器拉黑
-# Interval between fetching avatars (seconds). At least 3 seconds is recommended
-fetch_avatar_interval = 5.5
-
-# 获取头像最大队列长度，注意最长等待时间等于 最大队列长度 * 请求间隔时间
+# 获取头像最大队列长度
 # Maximum queue length for fetching avatar
-fetch_avatar_max_queue_size = 1
+fetch_avatar_max_queue_size = 3
 
 # 内存中头像缓存数量
 # Number of avatar caches in memory

services/avatar.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 import asyncio
+import dataclasses
 import datetime
 import hashlib
 import logging
@@ -21,32 +22,36 @@ logger = logging.getLogger(__name__)
 
 DEFAULT_AVATAR_URL = '//static.hdslb.com/images/member/noface.gif'
 
+_avatar_fetchers: List['AvatarFetcher'] = []
 # user_id -> avatar_url
 _avatar_url_cache: Optional[cachetools.TTLCache] = None
 # 正在获取头像的Future，user_id -> Future
 _uid_fetch_future_map: Dict[int, asyncio.Future] = {}
-# 正在获取头像的user_id队列
-_uid_queue_to_fetch: Optional[asyncio.Queue] = None
-# 上次被B站ban时间
-_last_fetch_banned_time: Optional[datetime.datetime] = None
-
-# wbi密码表
-WBI_KEY_INDEX_TABLE = [
-    46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35,
-    27, 43, 5, 49, 33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13
-]
-# wbi鉴权口令
-_wbi_key = ''
-# 正在获取wbi_key的Future
-_refresh_wbi_key_future: Optional[asyncio.Future] = None
+# 正在获取头像的任务队列
+_task_queue: Optional['asyncio.Queue[FetchTask]'] = None
+
+
+@dataclasses.dataclass
+class FetchTask:
+    user_id: int
+    future: 'asyncio.Future[Optional[str]]'
 
 
 def init():
     cfg = config.get_config()
-    global _avatar_url_cache, _uid_queue_to_fetch
+    global _avatar_url_cache, _task_queue
     _avatar_url_cache = cachetools.TTLCache(cfg.avatar_cache_size, 10 * 60)
-    _uid_queue_to_fetch = asyncio.Queue(cfg.fetch_avatar_max_queue_size)
-    asyncio.get_event_loop().create_task(_get_avatar_url_from_web_consumer())
+    _task_queue = asyncio.Queue(cfg.fetch_avatar_max_queue_size)
+    asyncio.get_event_loop().create_task(_do_init())
+
+
+async def _do_init():
+    fetchers = [
+        UserSpaceAvatarFetcher(5.5),
+    ]
+    await asyncio.gather(*(fetcher.init() for fetcher in fetchers))
+    global _avatar_fetchers
+    _avatar_fetchers = fetchers
 
 
 async def get_avatar_url(user_id) -> str:
@@ -102,6 +107,17 @@ def update_avatar_cache_if_expired(user_id, avatar_url):
         update_avatar_cache(user_id, avatar_url)
 
 
+def process_avatar_url(avatar_url):
+    # 去掉协议，兼容HTTP、HTTPS
+    m = re.fullmatch(r'(?:https?:)?(.*)', avatar_url)
+    if m is not None:
+        avatar_url = m[1]
+    # 缩小图片加快传输
+    if not avatar_url.endswith('noface.gif'):
+        avatar_url += '@48w_48h'
+    return avatar_url
+
+
 def _get_avatar_url_from_memory(user_id) -> Optional[str]:
     return _avatar_url_cache.get(user_id, None)
 
@@ -169,167 +185,228 @@ def _get_avatar_url_from_web(user_id) -> Awaitable[Optional[str]]:
     if future is not None:
         return future
     # 否则创建一个获取任务
-    _uid_fetch_future_map[user_id] = future = asyncio.get_running_loop().create_future()
-    future.add_done_callback(lambda _future: _uid_fetch_future_map.pop(user_id, None))
-    try:
-        _uid_queue_to_fetch.put_nowait(user_id)
-    except asyncio.QueueFull:
+    future = asyncio.get_running_loop().create_future()
+
+    task = FetchTask(
+        user_id=user_id,
+        future=future
+    )
+    if not _push_task(task):
         future.set_result(None)
+        return future
+
+    _uid_fetch_future_map[user_id] = future
+    future.add_done_callback(lambda _future: _uid_fetch_future_map.pop(user_id, None))
     return future
 
 
-async def _get_avatar_url_from_web_consumer():
-    while True:
-        try:
-            user_id = await _uid_queue_to_fetch.get()
-            future = _uid_fetch_future_map.get(user_id, None)
-            if future is None:
-                continue
-
-            # 防止在被ban的时候获取
-            global _last_fetch_banned_time
-            if _last_fetch_banned_time is not None:
-                cur_time = datetime.datetime.now()
-                if (cur_time - _last_fetch_banned_time).total_seconds() < 3 * 60 + 3:
-                    # 3分钟以内被ban
-                    future.set_result(None)
-                    continue
-                else:
-                    _last_fetch_banned_time = None
-
-            asyncio.create_task(_get_avatar_url_from_web_wrapper(user_id, future))
-
-            # 限制频率，防止被B站ban
-            cfg = config.get_config()
-            await asyncio.sleep(cfg.fetch_avatar_interval)
-        except Exception:  # noqa
-            logger.exception('_get_avatar_url_from_web_consumer error:')
-
-
-async def _get_avatar_url_from_web_wrapper(user_id, future):
+def _push_task(task: FetchTask):
+    if not _has_available_avatar_fetcher():
+        return False
+
     try:
-        avatar_url = await _do_get_avatar_url_from_web(user_id)
-    except BaseException as e:
-        future.set_exception(e)
-    else:
-        future.set_result(avatar_url)
+        _task_queue.put_nowait(task)
+        return True
+    except asyncio.QueueFull:
+        return False
 
 
-async def _do_get_avatar_url_from_web(user_id) -> Optional[str]:
-    global _wbi_key, _refresh_wbi_key_future, _last_fetch_banned_time
-    if _wbi_key == '':
-        if _refresh_wbi_key_future is None:
-            _refresh_wbi_key_future = asyncio.create_task(_refresh_wbi_key())
-        await _refresh_wbi_key_future
+def _pop_task() -> Awaitable[FetchTask]:
+    return _task_queue.get()
 
-    try:
-        async with utils.request.http_session.get(
-            'https://api.bilibili.com/x/space/wbi/acc/info',
-            headers={
-                **utils.request.BILIBILI_COMMON_HEADERS,
-                'Origin': 'https://space.bilibili.com',
-                'Referer': f'https://space.bilibili.com/{user_id}/'
-            },
-            params=_add_wbi_sign({'mid': user_id}),
-        ) as r:
-            if r.status != 200:
-                logger.warning('Failed to fetch avatar: status=%d %s uid=%d', r.status, r.reason, user_id)
-                if r.status == 412:
-                    # 被B站ban了
-                    _last_fetch_banned_time = datetime.datetime.now()
-                return None
-            data = await r.json()
-    except (aiohttp.ClientConnectionError, asyncio.TimeoutError):
-        return None
 
-    code = data['code']
-    if code != 0:
-        logger.info('Failed to fetch avatar: code=%d %s uid=%d', code, data['message'], user_id)
-        if code == -401:
-            # 被B站ban了
-            _last_fetch_banned_time = datetime.datetime.now()
-        elif code == -403:
-            # 签名错误
-            _wbi_key = ''
-        return None
+def _cancel_all_tasks_if_no_available_avatar_fetcher():
+    if _has_available_avatar_fetcher():
+        return
 
-    return process_avatar_url(data['data']['face'])
+    logger.warning('No available avatar fetcher')
+    while not _task_queue.empty():
+        task = _task_queue.get_nowait()
+        task.future.set_result(None)
 
 
-async def _refresh_wbi_key():
-    global _wbi_key, _refresh_wbi_key_future
-    try:
-        _wbi_key = await _get_wbi_key()
-    finally:
-        _refresh_wbi_key_future = None
+def _has_available_avatar_fetcher():
+    return any(fetcher.is_available for fetcher in _avatar_fetchers)
 
 
-async def _get_wbi_key():
-    try:
-        async with utils.request.http_session.get(
-            'https://api.bilibili.com/nav',
-            headers=utils.request.BILIBILI_COMMON_HEADERS,
-        ) as r:
-            if r.status != 200:
-                logger.warning('Failed to get wbi key: status=%d %s', r.status, r.reason)
-                return ''
-            data = await r.json()
-    except (aiohttp.ClientConnectionError, asyncio.TimeoutError):
-        logger.exception('Failed to get wbi key:')
-        return ''
+class AvatarFetcher:
+    def __init__(self, query_interval):
+        self._query_interval = query_interval
+        self._be_available_event = asyncio.Event()
+        self._be_available_event.set()
 
-    try:
-        wbi_img = data['data']['wbi_img']
-        img_key = wbi_img['img_url'].rpartition('/')[2].partition('.')[0]
-        sub_key = wbi_img['sub_url'].rpartition('/')[2].partition('.')[0]
-    except KeyError:
-        logger.warning('Failed to get wbi key: data=%s', data)
-        return ''
-
-    shuffled_key = img_key + sub_key
-    wbi_key = []
-    for index in WBI_KEY_INDEX_TABLE:
-        if index < len(shuffled_key):
-            wbi_key.append(shuffled_key[index])
-    return ''.join(wbi_key)
-
-
-def _add_wbi_sign(params: dict):
-    if _wbi_key == '':
-        return params
-
-    wts = str(int(datetime.datetime.now().timestamp()))
-    params_to_sign = {**params, 'wts': wts}
-
-    # 按key字典序排序
-    params_to_sign = {
-        key: params_to_sign[key]
-        for key in sorted(params_to_sign.keys())
-    }
-    # 过滤一些字符
-    for key, value in params_to_sign.items():
-        value = ''.join(
-            ch
-            for ch in str(value)
-            if ch not in "!'()*"
+        self._cool_down_timer_handle = None
+
+    async def init(self):
+        asyncio.create_task(self._fetch_consumer())
+        return True
+
+    @property
+    def is_available(self):
+        return self._cool_down_timer_handle is None
+
+    def _on_availability_change(self):
+        if self.is_available:
+            self._be_available_event.set()
+        else:
+            self._be_available_event.clear()
+            _cancel_all_tasks_if_no_available_avatar_fetcher()
+
+    async def _fetch_consumer(self):
+        cls_name = type(self).__name__
+        while True:
+            try:
+                if not self.is_available:
+                    logger.info('%s waiting to become available', cls_name)
+                    await self._be_available_event.wait()
+                    logger.info('%s became available', cls_name)
+
+                task = await _pop_task()
+                # 为了简化代码，约定只会在_fetch_wrapper里变成不可用，所以获取task之后这里还是可用的
+                assert self.is_available
+
+                start_time = datetime.datetime.now()
+                await self._fetch_wrapper(task)
+                cost_time = (datetime.datetime.now() - start_time).total_seconds()
+
+                # 限制频率，防止被B站ban
+                await asyncio.sleep(self._query_interval - cost_time)
+            except Exception:  # noqa
+                logger.exception('%s error:', cls_name)
+
+    async def _fetch_wrapper(self, task: FetchTask) -> Optional[str]:
+        try:
+            avatar_url = await self._do_fetch(task.user_id)
+        except BaseException as e:
+            task.future.set_exception(e)
+            return None
+
+        task.future.set_result(avatar_url)
+        return avatar_url
+
+    async def _do_fetch(self, user_id) -> Optional[str]:
+        raise NotImplementedError
+
+    def _cool_down(self, sleep_time):
+        if self._cool_down_timer_handle is not None:
+            return
+
+        self._cool_down_timer_handle = asyncio.get_running_loop().call_later(
+            sleep_time, self._on_cool_down_timeout
         )
-        params_to_sign[key] = value
+        self._on_availability_change()
 
-    str_to_sign = urllib.parse.urlencode(params_to_sign) + _wbi_key
-    w_rid = hashlib.md5(str_to_sign.encode('utf-8')).hexdigest()
-    return {
-        **params,
-        'wts': wts,
-        'w_rid': w_rid
-    }
+    def _on_cool_down_timeout(self):
+        self._cool_down_timer_handle = None
+        self._on_availability_change()
 
 
-def process_avatar_url(avatar_url):
-    # 去掉协议，兼容HTTP、HTTPS
-    m = re.fullmatch(r'(?:https?:)?(.*)', avatar_url)
-    if m is not None:
-        avatar_url = m[1]
-    # 缩小图片加快传输
-    if not avatar_url.endswith('noface.gif'):
-        avatar_url += '@48w_48h'
-    return avatar_url
+class UserSpaceAvatarFetcher(AvatarFetcher):
+    # wbi密码表
+    WBI_KEY_INDEX_TABLE = [
+        46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35,
+        27, 43, 5, 49, 33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13
+    ]
+
+    def __init__(self, query_interval):
+        super().__init__(query_interval)
+
+        # wbi鉴权口令
+        self._wbi_key = ''
+
+    async def _do_fetch(self, user_id) -> Optional[str]:
+        if self._wbi_key == '':
+            self._wbi_key = await self._get_wbi_key()
+            if self._wbi_key == '':
+                return None
+
+        try:
+            async with utils.request.http_session.get(
+                'https://api.bilibili.com/x/space/wbi/acc/info',
+                headers={
+                    **utils.request.BILIBILI_COMMON_HEADERS,
+                    'Origin': 'https://space.bilibili.com',
+                    'Referer': f'https://space.bilibili.com/{user_id}/'
+                },
+                params=self._add_wbi_sign({'mid': user_id}),
+            ) as r:
+                if r.status != 200:
+                    logger.warning('Failed to fetch avatar: status=%d %s uid=%d', r.status, r.reason, user_id)
+                    if r.status == 412:
+                        # 被B站ban了
+                        self._cool_down(3 * 60)
+                    return None
+                data = await r.json()
+        except (aiohttp.ClientConnectionError, asyncio.TimeoutError):
+            return None
+
+        code = data['code']
+        if code != 0:
+            logger.info('Failed to fetch avatar: code=%d %s uid=%d', code, data['message'], user_id)
+            if code == -401:
+                # 被B站ban了
+                self._cool_down(3 * 60)
+            elif code == -403:
+                # 签名错误
+                self._wbi_key = ''
+            return None
+
+        return process_avatar_url(data['data']['face'])
+
+    async def _get_wbi_key(self):
+        try:
+            async with utils.request.http_session.get(
+                'https://api.bilibili.com/nav',
+                headers=utils.request.BILIBILI_COMMON_HEADERS,
+            ) as r:
+                if r.status != 200:
+                    logger.warning('Failed to get wbi key: status=%d %s', r.status, r.reason)
+                    return ''
+                data = await r.json()
+        except (aiohttp.ClientConnectionError, asyncio.TimeoutError):
+            logger.exception('Failed to get wbi key:')
+            return ''
+
+        try:
+            wbi_img = data['data']['wbi_img']
+            img_key = wbi_img['img_url'].rpartition('/')[2].partition('.')[0]
+            sub_key = wbi_img['sub_url'].rpartition('/')[2].partition('.')[0]
+        except KeyError:
+            logger.warning('Failed to get wbi key: data=%s', data)
+            return ''
+
+        shuffled_key = img_key + sub_key
+        wbi_key = []
+        for index in self.WBI_KEY_INDEX_TABLE:
+            if index < len(shuffled_key):
+                wbi_key.append(shuffled_key[index])
+        return ''.join(wbi_key)
+
+    def _add_wbi_sign(self, params: dict):
+        if self._wbi_key == '':
+            return params
+
+        wts = str(int(datetime.datetime.now().timestamp()))
+        params_to_sign = {**params, 'wts': wts}
+
+        # 按key字典序排序
+        params_to_sign = {
+            key: params_to_sign[key]
+            for key in sorted(params_to_sign.keys())
+        }
+        # 过滤一些字符
+        for key, value in params_to_sign.items():
+            value = ''.join(
+                ch
+                for ch in str(value)
+                if ch not in "!'()*"
+            )
+            params_to_sign[key] = value
+
+        str_to_sign = urllib.parse.urlencode(params_to_sign) + self._wbi_key
+        w_rid = hashlib.md5(str_to_sign.encode('utf-8')).hexdigest()
+        return {
+            **params,
+            'wts': wts,
+            'w_rid': w_rid
+        }