Better async performance?

and some pep8

cogs/utils/RoxUtils.py

@@ -1,48 +1,32 @@
 import aiohttp
 import asyncio
-from bs4 import BeautifulSoup as BS
+from bs4 import BeautifulSoup as bs4
+
+session = aiohttp.ClientSession()
 
 
 class ThumbNailer(object):
 
-    def __init__(self):
-        self.url = self
-
-    async def connection(self, url):
-        async with aiohttp.ClientSession() as session:
+    async def get_img(self, url):
             async with session.get(url, timeout=30) as response:
                 assert response.status == 200
                 html = await response.read()
-                return ThumbNailer.__parse_result(html)
+                return await ThumbNailer.__parse_result(html)
 
-    def __parse_result(html):
+    async def __parse_result(html):
         try:
-            soup = BS(html, 'html.parser')
+            soup = bs4(html, 'html.parser')
             img = soup.find("meta", property="twitter:image")["content"]
             return img
         except Exception as e:
             raise e
 
     async def identify(self, identifier, uri):
-        thumbnail_url = ""
         if "youtube" in uri:
             thumbnail_url = f"https://img.youtube.com/vi/{identifier}/0.jpg"
             return thumbnail_url
         elif "soundcloud" in uri:
-            thumbnail_url = await ThumbNailer.connection(ThumbNailer, url=uri)
+            thumbnail_url = await ThumbNailer.get_img(ThumbNailer, url=uri)
             return thumbnail_url
         else:
             return None
-
-
-
-def thumbnailer(self, identifier, uri):
-    thumbnail_url = ""
-    if "youtube" in uri:
-        thumbnail_url = f"https://img.youtube.com/vi/{identifier}/0.jpg"
-        return thumbnail_url
-    elif "soundcloud" in uri:
-        thumbnail_url = BS(requests.get(uri).text, "html.parser").find("meta", property="twitter:image")["content"]
-        return thumbnail_url
-    else:
-        return None

requirements.txt

@@ -2,5 +2,5 @@ git+https://github.com/Rapptz/discord.py@rewrite
 git+https://github.com/Devoxin/Lavalink.py@dev
 asyncio
 pyyaml
-bs4
+BeautifulSoup4
 aiohttp<3.5.0,>=3.3.0