[Audio] V3/auto autostart only (#1420)

* Download jar at audio load

* Messy...

* Remove leftover log file stuff

* Keep application.yml

* Damn you windows

redbot/cogs/audio/__init__.py

@@ -1,8 +1,57 @@
+from pathlib import Path
+from aiohttp import ClientSession
+import shutil
+import asyncio
+
 from .audio import Audio
+from .manager import start_lavalink_server
 from discord.ext import commands
+from redbot.core.data_manager import cog_data_path
+
+LAVALINK_BUILD = 3065
+LAVALINK_BUILD_URL = (
+    "https://ci.fredboat.com/repository/download/"
+    "Lavalink_Build/{}:id/Lavalink.jar?guest=1"
+).format(LAVALINK_BUILD)
+
+LAVALINK_DOWNLOAD_DIR = cog_data_path(raw_name="Audio")
+LAVALINK_JAR_FILE = LAVALINK_DOWNLOAD_DIR / "Lavalink.jar"
+
+APP_YML_FILE = LAVALINK_DOWNLOAD_DIR / "application.yml"
+BUNDLED_APP_YML_FILE = Path(__file__).parent / "application.yml"
+
+
+async def download_lavalink(session):
+    with LAVALINK_JAR_FILE.open(mode='wb') as f:
+        async with session.get(LAVALINK_BUILD_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 = await cog.config.current_build()
+
+    if not jar_exists or current_build < LAVALINK_BUILD:
+        LAVALINK_DOWNLOAD_DIR.mkdir(parents=True, exist_ok=True)
+        with ClientSession(loop=loop) as session:
+            await download_lavalink(session)
+        await cog.config.current_build.set(LAVALINK_BUILD)
+
+    shutil.copyfile(str(BUNDLED_APP_YML_FILE), str(APP_YML_FILE))
 
 
 async def setup(bot: commands.Bot):
     cog = Audio(bot)
-    await cog.init_config()
-    bot.add_cog(cog)
+    await maybe_download_lavalink(bot.loop, cog)
+    await start_lavalink_server(bot.loop)
+
+    async def _finish():
+        await asyncio.sleep(10)
+        await cog.init_config()
+        bot.add_cog(cog)
+
+    bot.loop.create_task(_finish())

redbot/cogs/audio/audio.py

@@ -9,13 +9,12 @@ import math
 from discord.ext import commands
 from redbot.core import Config, checks
 
+from .manager import shutdown_lavalink_server
+
 __version__ = "2.0.2.9.b"
 __author__ = ["aikaterna", "billy/bollo/ati"]
 
 
-LAVALINK_BUILD = 3065
-
-
 class Audio:
     def __init__(self, bot):
         self.bot = bot
@@ -25,7 +24,8 @@ class Audio:
             "host": 'localhost',
             "port": '2332',
             "passw": 'youshallnotpass',
-            "status": False
+            "status": False,
+            "current_build": 0
         }
 
         default_guild = {
@@ -39,10 +39,6 @@ class Audio:
         self.config.register_global(**default_global)
 
         self._lavalink = None
-        self._lavalink_build_url = (
-            "https://ci.fredboat.com/repository/download/"
-            "Lavalink_Build/{}:id/Lavalink.jar"
-        ).format(LAVALINK_BUILD)
 
     async def init_config(self):
         host = await self.config.host()
@@ -822,4 +818,6 @@ class Audio:
         return queue_total_duration
 
     def __unload(self):
+        self.bot.lavalink.ws._ws.close()
         self.bot.lavalink.client.destroy()
+        shutdown_lavalink_server()

redbot/cogs/audio/manager.py

@@ -0,0 +1,41 @@
+import shlex
+import asyncio
+from subprocess import Popen, DEVNULL
+import os
+
+proc = None
+SHUTDOWN = asyncio.Event()
+
+
+async def monitor_lavalink_server(loop):
+    while not SHUTDOWN.is_set():
+        if proc.poll() is not None:
+            break
+        await asyncio.sleep(0.5)
+
+    if not SHUTDOWN.is_set():
+        print("Lavalink jar shutdown, restarting.")
+        await start_lavalink_server(loop)
+
+
+async def start_lavalink_server(loop):
+    from . import LAVALINK_DOWNLOAD_DIR, LAVALINK_JAR_FILE
+    start_cmd = "java -jar {}".format(LAVALINK_JAR_FILE.resolve())
+
+    global proc
+    proc = Popen(
+        shlex.split(start_cmd, posix=os.name == 'posix'),
+        cwd=str(LAVALINK_DOWNLOAD_DIR),
+        stdout=DEVNULL, stderr=DEVNULL
+    )
+
+    print("Lavalink jar started. PID: {}".format(proc.pid))
+
+    loop.create_task(monitor_lavalink_server(loop))
+
+
+def shutdown_lavalink_server():
+    print("Shutting down lavalink server.")
+    SHUTDOWN.set()
+    if proc is not None:
+        proc.terminate()

setup.py

@@ -96,6 +96,7 @@ setup(
     version="{}.{}.{}b9".format(*get_version()),
     packages=get_package_list(),
     package_data=find_locale_folders(),
+    include_package_data=True,
     url='https://github.com/Cog-Creators/Red-DiscordBot',
     license='GPLv3',
     author='Cog-Creators',