Add a lock for the status command

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Next version
 
+### ✨ Improved
+
+* Add a lock for the status command to prevent multiple concurrent requests.
+
 ### ⚙️ Engineering
 
 Use `uv` for packaging.

python/lvmecp/actor/actor.py

@@ -56,6 +56,8 @@ def __init__(
         else:
             self.plc = plc
 
+        self.lock = asyncio.Lock()
+
     async def start(self, **kwargs):
         """Starts the actor."""
 

python/lvmecp/actor/commands/status.py

@@ -29,16 +29,17 @@ async def status(command: ECPCommand, no_registers: bool = False):
 
     plc = command.actor.plc
 
-    if no_registers is False:
-        command.info(registers=(await plc.read_all_registers(use_cache=False)))
-
-    modules: list[PLCModule] = [plc.dome, plc.safety, plc.lights]
-    await asyncio.gather(
-        *[
-            module.update(force_output=True, command=command, use_cache=True)
-            for module in modules
-        ]
-    )
+    async with command.actor.lock:
+        if no_registers is False:
+            command.info(registers=(await plc.read_all_registers(use_cache=False)))
+
+        modules: list[PLCModule] = [plc.dome, plc.safety, plc.lights]
+        await asyncio.gather(
+            *[
+                module.update(force_output=True, command=command, use_cache=True)
+                for module in modules
+            ]
+        )
 
     command.info(
         o2_percent_utilities=plc.safety.o2_level_utilities,