feat(backend_server.py): add ACK_TIMEOUT constant

src/judas_server/backend/backend_server.py

@@ -6,7 +6,7 @@ import selectors
 import socket
 import threading
 import time
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Final
 
 import yaml
 from judas_protocol import Category, ControlAction, Message
@@ -21,6 +21,8 @@ if TYPE_CHECKING:
 
 
 class BackendServer:
+    ACK_TIMEOUT: Final[float] = 5.0  # seconds
+
     def __init__(self, host: str = "0.0.0.0", port: int = 3692) -> None:
         """Initialize the backend server.
 
@@ -356,12 +358,13 @@ class BackendServer:
 
                 # check pending ACKs
                 for client, msg, timestamp in self.pending_acks[:]:
-                    if time.time() - timestamp > 5:  # 5 second timeout
+                    if time.time() - timestamp > self.ACK_TIMEOUT:
                         self.logger.warning(
                             f"ACK timeout for message {msg.id} to {client}, resending..."
                         )
                         self.send(client, msg)
                         self.pending_acks.remove((client, msg, timestamp))
+
                 time.sleep(0.001)  # prevent 100% CPU usage
 
         except Exception as e: