First draft of new API plugin system

openflexure_microscope/common/labthings/__init__.py

@@ -0,0 +1,37 @@
+from flask import current_app, _app_ctx_stack
+
+EXTENSION_NAME = "flask-lab"
+
+
+class LabThing(object):
+    def __init__(self, app=None):
+        self.app = app
+        self.devices = {}
+        if app is not None:
+            self.init_app(app)
+
+    def init_app(self, app):
+        app.teardown_appcontext(self.teardown)
+
+        app.extensions = getattr(app, "extensions", {})
+        app.extensions[EXTENSION_NAME] = self
+
+    def teardown(self, exception):
+        print(f"Tearing down devices: {self.devices}")
+
+    def register_device(self, device_object, device_name: str):
+        self.devices[device_name] = device_object
+
+
+def find_device(device_name):
+    app = current_app
+
+    if not app:
+        return None
+
+    pylot_instance = app.extensions[EXTENSION_NAME]
+
+    if device_name in pylot_instance.devices:
+        return pylot_instance.devices[device_name]
+    else:
+        return None