refactor: dynamically retrieve maximum buffer size from environment i…

…n SizedLogBuffer (#4334)

* Refactor logger to dynamically retrieve max buffer size from environment variable

* fix: add setter to max property

src/backend/base/langflow/logging/logger.py

@@ -32,16 +32,12 @@ def __init__(
         The buffer can be overwritten by an env variable LANGFLOW_LOG_RETRIEVER_BUFFER_SIZE
         because the logger is initialized before the settings_service are loaded.
         """
-        self.max: int = 0
-        env_buffer_size = os.getenv("LANGFLOW_LOG_RETRIEVER_BUFFER_SIZE", "0")
-        if env_buffer_size.isdigit():
-            self.max = int(env_buffer_size)
-
         self.buffer: deque = deque()
 
         self._max_readers = max_readers
         self._wlock = Lock()
         self._rsemaphore = Semaphore(max_readers)
+        self._max = 0
 
     def get_write_lock(self) -> Lock:
         return self._wlock
@@ -106,6 +102,19 @@ def get_last_n(self, last_idx: int) -> dict[int, str]:
         finally:
             self._rsemaphore.release()
 
+    @property
+    def max(self) -> int:
+        # Get it dynamically to allow for env variable changes
+        if self._max == 0:
+            env_buffer_size = os.getenv("LANGFLOW_LOG_RETRIEVER_BUFFER_SIZE", "0")
+            if env_buffer_size.isdigit():
+                self._max = int(env_buffer_size)
+        return self._max
+
+    @max.setter
+    def max(self, value: int) -> None:
+        self._max = value
+
     def enabled(self) -> bool:
         return self.max > 0