Merge pull request #16 from spacetelescope/bugfix/take_exposures_errors_when_slow

Make take exposures tolerate slow yields

Author: RemiSoummer

catkit2/testbed/proxies/camera.py

@@ -13,14 +13,26 @@ def take_raw_exposures(self, num_exposures):
         first_frame_id = self.images.newest_available_frame_id
 
         if was_acquiring:
-            # Ignore first to frames to ensure the frames were taken _after_ the
+            # Ignore first two frames to ensure the frames were taken _after_ the
             # call to this function. This is not necessary if the acquisition just
             # started.
             first_frame_id += 2
 
         try:
-            for i in range(num_exposures):
-                yield self.images.get_frame(first_frame_id + i, 100000).data.copy()
+            i = 0
+            num_exposures_remaining = num_exposures
+
+            while num_exposures_remaining >= 1:
+                try:
+                    frame = self.images.get_frame(first_frame_id + i, 100000)
+                except RuntimeError:
+                    # The frame wasn't available anymore because we were waiting too long.
+                    continue
+                finally:
+                    i += 1
+
+                yield frame.data.copy()
+                num_exposures_remaining -= 1
         finally:
             if not was_acquiring:
                 self.stop_acquisition()