First draft of new API plugin system

openflexure_microscope/api/microscope.py

@@ -0,0 +1,48 @@
+from openflexure_microscope import Microscope
+from openflexure_microscope.camera.capture import build_captures_from_exif
+
+import logging
+
+# Import device modules
+# NB this will eventually be handled by the RC file, so you can choose what device
+# class should be attached.
+try:
+    from openflexure_microscope.camera.pi import PiCameraStreamer
+except ImportError:
+    logging.warning("Unable to import PiCameraStreamer")
+from openflexure_microscope.camera.mock import MockStreamer
+
+from openflexure_microscope.stage.sanga import SangaStage
+from openflexure_microscope.stage.mock import MockStage
+
+default_microscope = Microscope()
+
+# Initialise camera
+logging.debug("Creating camera object...")
+try:
+    api_camera = PiCameraStreamer()
+except Exception as e:
+    logging.error(e)
+    logging.warning("No valid camera hardware found. Falling back to mock camera!")
+    api_camera = MockStreamer()
+
+# Initialise stage
+logging.debug("Creating stage object...")
+try:
+    api_stage = SangaStage()
+except Exception as e:
+    logging.error(e)
+    logging.warning("No valid stage hardware found. Falling back to mock stage!")
+    api_stage = MockStage()
+
+# Attach devices to microscope
+logging.debug("Attaching devices to microscope...")
+default_microscope.attach(api_camera, api_stage)
+
+# Restore loaded capture array to camera object
+logging.debug("Restoring captures...")
+default_microscope.camera.images = build_captures_from_exif(
+    default_microscope.camera.paths["default"]
+)
+
+logging.debug("Microscope successfully attached!")