feat(monitoring): add http server for monitoring

bot.py

@@ -38,6 +38,7 @@ l_extensions = (
     'cogs.utility',
     'cogs.vocal',
     'cogs.private',
+    'cogs.monitoring',
     'jishaku'
 )
 

cogs/monitoring.py

@@ -0,0 +1,41 @@
+import asyncio
+import threading
+from aiohttp import web
+
+from discord.ext import commands
+from bot import TuxBot
+
+
+class Monitoring(commands.Cog):
+
+    def __init__(self):
+        self.app = web.Application()
+
+        t = threading.Thread(
+            target=self.run_server,
+            args=(self.aiohttp_server(),)
+        )
+        t.start()
+
+    def aiohttp_server(self):
+        async def hi(request):
+            return web.Response(text="I'm alive !")
+
+        self.app.add_routes([web.get('/', hi)])
+        runner = web.AppRunner(self.app)
+
+        return runner
+
+    @staticmethod
+    def run_server(runner):
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        loop.run_until_complete(runner.setup())
+        site = web.TCPSite(runner, '0.0.0.0', 3389)
+        loop.run_until_complete(site.start())
+        loop.run_forever()
+
+
+def setup(bot: TuxBot):
+    bot.add_cog(Monitoring())
+