selectively set network interface based on platform

Author: Lmh-java

src/software/thunderscope/binary_context_managers/BUILD

@@ -23,6 +23,7 @@ py_library(
         "//proto:import_all_protos",
         "//software/networking:ssl_proto_communication",
         "//software/thunderscope/common:thread_safe_circular_buffer",
+        "//software/thunderscope:util",
     ],
 )
 

src/software/thunderscope/binary_context_managers/game_controller.py

@@ -4,7 +4,6 @@
 import random
 import logging
 import os
-import socket
 import time
 from subprocess import Popen
 from typing import Any
@@ -21,6 +20,7 @@
 from software.thunderscope.common.thread_safe_circular_buffer import (
     ThreadSafeCircularBuffer,
 )
+from software.thunderscope.util import is_current_platform_macos
 
 logger = logging.getLogger(__name__)
 import itertools
@@ -288,10 +288,16 @@ def __send_referee_command(data: Referee) -> None:
             if autoref_proto_unix_io is not None:
                 autoref_proto_unix_io.send_proto(Referee, data)
 
+
+        if is_current_platform_macos():
+            loopback_iface = "en0"
+        else:
+            loopback_iface = "lo"
+
         self.receive_referee_command = tbots_cpp.SSLRefereeProtoListener(
             Gamecontroller.REFEREE_IP,
             self.referee_port,
-            "lo",
+            loopback_iface,
             __send_referee_command,
             True,
         )

src/software/thunderscope/util.py

@@ -1,3 +1,4 @@
+import platform
 from typing import Callable, NoReturn, TYPE_CHECKING
 
 if TYPE_CHECKING:
@@ -195,3 +196,10 @@ def color_from_gradient(
                         int(b_range[i] + (b_range[i + 1] - b_range[i]) * sig_val),
                         int(a_range[i] + (a_range[i + 1] - a_range[i]) * sig_val),
                     )
+
+def is_current_platform_macos() -> bool:
+    """
+    Return True if the current process is running on macOS.
+    Uses platform.system(), which should reliably return 'Darwin' on macOS.
+    """
+    return platform.system().lower() == "darwin"