[RPC] Set custom port with flags

redbot/core/bot.py

@@ -40,6 +40,7 @@ def __init__(self, *args, cli_flags=None, bot_dir: Path = Path.cwd(), **kwargs):
         self.db = Config.get_core_conf(force_registration=True)
         self._co_owners = cli_flags.co_owner
         self.rpc_enabled = cli_flags.rpc
+        self.rpc_port = cli_flags.rpc_port
         self._last_exception = None
         self.db.register_global(
             token=None,

redbot/core/cli.py

@@ -117,6 +117,12 @@ def parse_cli_flags(args):
         action="store_true",
         help="Enables the built-in RPC server. Please read the docs prior to enabling this!",
     )
+    parser.add_argument(
+        "--rpc-port",
+        type=int,
+        default=6133,
+        help="The port of the built-in RPC server to use. Default to 6133.",
+    )
     parser.add_argument("--token", type=str, help="Run Red with the given token.")
     parser.add_argument(
         "--no-instance",

redbot/core/events.py

@@ -79,7 +79,7 @@ async def on_ready():
                 print("Loaded packages: " + ", ".join(packages))
 
         if bot.rpc_enabled:
-            await bot.rpc.initialize()
+            await bot.rpc.initialize(bot.rpc_port)
 
         guilds = len(bot.guilds)
         users = len(set([m for m in bot.get_all_members()]))

redbot/core/rpc.py

@@ -69,15 +69,15 @@ def __init__(self):
         self._runner = web.AppRunner(self.app)
         self._site: Optional[web.TCPSite] = None
 
-    async def initialize(self):
+    async def initialize(self, port: int):
         """
         Finalizes the initialization of the RPC server and allows it to begin
         accepting queries.
         """
         await self._runner.setup()
-        self._site = web.TCPSite(self._runner, host="127.0.0.1", port=6133)
+        self._site = web.TCPSite(self._runner, host="127.0.0.1", port=port)
         await self._site.start()
-        log.debug("Created RPC server listener.")
+        log.debug("Created RPC server listener on port %s", port)
 
     async def close(self):
         """