Revert "[Audio] Connect to lavalink in the background (#2335)" (#2459)

This reverts commit b633a33137.

redbot/cogs/audio/__init__.py

@@ -1,8 +1,10 @@
 from pathlib import Path
+from aiohttp import ClientSession
+import shutil
 import logging
 
 from .audio import Audio
-from .manager import start_lavalink_server, maybe_download_lavalink
+from .manager import start_lavalink_server
 from redbot.core import commands
 from redbot.core.data_manager import cog_data_path
 import redbot.core
@@ -20,6 +22,30 @@ APP_YML_FILE = LAVALINK_DOWNLOAD_DIR / "application.yml"
 BUNDLED_APP_YML_FILE = Path(__file__).parent / "data/application.yml"
 
 
+async def download_lavalink(session):
+    with LAVALINK_JAR_FILE.open(mode="wb") as f:
+        async with session.get(LAVALINK_DOWNLOAD_URL) as resp:
+            while True:
+                chunk = await resp.content.read(512)
+                if not chunk:
+                    break
+                f.write(chunk)
+
+
+async def maybe_download_lavalink(loop, cog):
+    jar_exists = LAVALINK_JAR_FILE.exists()
+    current_build = redbot.VersionInfo.from_json(await cog.config.current_version())
+
+    if not jar_exists or current_build < redbot.core.version_info:
+        log.info("Downloading Lavalink.jar")
+        LAVALINK_DOWNLOAD_DIR.mkdir(parents=True, exist_ok=True)
+        async with ClientSession(loop=loop) as session:
+            await download_lavalink(session)
+        await cog.config.current_version.set(redbot.core.version_info.to_json())
+
+    shutil.copyfile(str(BUNDLED_APP_YML_FILE), str(APP_YML_FILE))
+
+
 async def setup(bot: commands.Bot):
     cog = Audio(bot)
     if not await cog.config.use_external_lavalink():