Format log history for fallback server

src/openflexure_microscope_server/logging.py

@@ -207,6 +207,18 @@ class OFMHandler(logging.Handler):
         """
         return list(reversed(self._log))
 
+    @property
+    def get_formatted_log_history(self) -> str:
+        """Return the log history as a formatted string.
+
+        This is to be used for the fallback server, the formatting does not contain invocation
+        IDs as no actions should have started.
+        """
+        output = ""
+        for entry in self._log:
+            output += f"[{entry['timestamp']} [{entry['level']}] <{entry['logger']}> {entry['message']}\n"
+        return output
+
 
 class UvicornAccessFilter(logging.Filter):
     """A logging filter to filter out "uvicorn.access" messages."""

src/openflexure_microscope_server/server/__init__.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import json
 import logging
 import os
 from argparse import Namespace
@@ -151,8 +150,7 @@ def serve_from_cli(argv: Optional[list[str]] = None) -> None:
             print(f"Error: {e}")  # noqa: T201
             print("Starting fallback server.")  # noqa: T201
             try:
-                # The log is a list of dicts, fallback server expects a string
-                log_history = json.dumps(OFM_HANDLER.log_history, indent=2)
+                log_history = OFM_HANDLER.get_formatted_log_history
             except BaseException:
                 # If log history fails for any reason carry on.
                 log_history = None