Some minor type fixes

src/openflexure_microscope_server/logging.py

@@ -14,12 +14,13 @@ output to STDOUT/STDERR are captured by ``systemd``. These can be viewed by usin
 import logging
 import os
 from logging.handlers import RotatingFileHandler
+from typing import Optional
 
 from fastapi import HTTPException
 from fastapi.responses import PlainTextResponse
 
 LOGGER = logging.getLogger(__name__)
-OFM_LOG_FILE = None
+OFM_LOG_FILE: Optional[str] = None
 
 
 def configure_logging(log_folder: str) -> None:
@@ -128,7 +129,7 @@ class OFMHandler(logging.Handler):
             how many can be returned over HTTP.
         """
         super().__init__(level=level)
-        self._log = []
+        self._log: list[str] = []
         self._max_logs = max_logs
 
     def append_record(self, record: logging.LogRecord) -> None:

src/openflexure_microscope_server/server/legacy_api.py

@@ -6,6 +6,8 @@ from fastapi import Response
 
 import labthings_fastapi as lt
 
+from openflexure_microscope_server.things.camera import BaseCamera
+
 FAKE_ROUTES = [
     "/api/v2/",
     "/api/v2/streams/snapshot",
@@ -38,7 +40,10 @@ def add_v2_endpoints(thing_server: lt.ThingServer) -> None:
     @app.head("/api/v2/streams/snapshot")
     async def thumbnail() -> JPEGResponse:
         """Return a low-resolution snapshot, for compatibility with OF connect."""
-        blob = await thing_server.things["camera"].lores_mjpeg_stream.grab_frame()
+        camera_thing = thing_server.things["camera"]
+        if not isinstance(camera_thing, BaseCamera):
+            raise RuntimeError("Camera thing is not a BaseCamera")
+        blob = await camera_thing.lores_mjpeg_stream.grab_frame()
         return JPEGResponse(blob)
 
     @app.get("/api/v2/instrument/settings/name")

src/openflexure_microscope_server/things/camera/__init__.py

@@ -272,7 +272,7 @@ class BaseCamera(lt.Thing):
     @lt.action
     def capture_jpeg(
         self,
-        stream_name: str = "main",
+        stream_name: Literal["main", "lores", "full"] = "main",
         wait: Optional[float] = None,
     ) -> JPEGBlob:
         """Acquire one image from the camera as a JPEG.
@@ -526,7 +526,7 @@ class BaseCamera(lt.Thing):
         nothing is returned on success
         """
         if save_resolution is not None and image.size != save_resolution:
-            image = image.resize(save_resolution, Image.BOX)
+            image = image.resize(save_resolution, Image.Resampling.BOX)
         try:
             # Per PIL documentation,
             # (https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#jpeg)
@@ -537,7 +537,7 @@ class BaseCamera(lt.Thing):
             # disabled, file size increases and quality is barely or not affected
             image.save(jpeg_path, quality=95, subsampling=0)
             try:
-                self._add_metadata_to_capture(jpeg_path, metadata)
+                self._add_metadata_to_capture(jpeg_path, dict(metadata))
             except Exception:
                 # We need to capture any exception as there are many reasons metadata
                 # might not be added. We warn rather than log the error.