DAQ: safe beamline status

src/aare/daq/daq.py

@@ -1470,23 +1470,65 @@ class AareDAQ:
             )
             return fallback, False, f"Smargon unavailable: {e}"
 
+    def _safe_beamline_status(self) -> BeamlineStatus:
+        try:
+            return self.beamline_status
+        except Exception:
+            return BeamlineStatus(
+                name=self.__bl,
+                ring_current_mA=0.0,
+                front_light=0.0,
+                back_light=0.0,
+                cryojet_K=0.0,
+                shutter_open=False,
+                exp_shutter_open=None,
+                flux_ph_s=0.0,
+                sample_camera=SampleCameraSettings(gain=0.0, exposure=0.0),
+                transmission=None,
+                zoom=self.__devs.zoom,
+                commissioning_mode=self.__cfg.commissioning_mode,
+                dtz_min=20,
+                dtz_max=1000,
+            )
+
+    def _safe_diffraction_geometry(self) -> DiffractionGeometry:
+        try:
+            return self.diffraction_geometry
+        except Exception:
+            # Must satisfy pydantic constraints in DiffractionGeometry
+            return DiffractionGeometry(
+                energy_keV=12.4,
+                dtz_mm=150.0,
+                detector_size_pxl=(1, 1),
+                pixel_size_mm=0.15,
+                beam_center_pxl=(0.0, 0.0),
+                detector_description="unavailable",
+                detector_serial_number="unavailable",
+                poni_rot1_rad=0.0,
+                poni_rot2_rad=0.0,
+            )
+
     @property
     def status(self) -> DAQStatusModel:
         safe_sample, tell_ok, tell_err = self._safe_sample()
         safe_geom, smargon_ok, smargon_err = self._safe_geom()
-        # session should be set by FastAPI server
+
         return DAQStatusModel(
             state=self.state,
             busy=self.busy,
-            geom=self.sample_geometry,
-            bl=self.beamline_status,
-            sample=self.sample,
+            geom=safe_geom,
+            bl=self._safe_beamline_status(),
+            sample=safe_sample,
             session=SessionStatus(),
-            diffraction=self.diffraction_geometry,
+            diffraction=self._safe_diffraction_geometry(),
             box=self.__saved_box,
-            last_best_res = self.__cfg.last_best_res,
-            last_best_b_factor = self.__cfg.last_best_b_factor,
-            crystal_size = self.__cfg.crystal_size
+            last_best_res=self.__cfg.last_best_res,
+            last_best_b_factor=self.__cfg.last_best_b_factor,
+            crystal_size=self.__cfg.crystal_size,
+            tell_connected=tell_ok,
+            tell_error=tell_err,
+            smargon_connected=smargon_ok,
+            smargon_error=smargon_err,
         )
 
     def cancel(self):