L2SS-544: Parse exceptions more directly

tangostationcontrol/tangostationcontrol/toolkit/archiver.py

@@ -2,7 +2,7 @@
 
 import logging
 
-from tango import DeviceProxy, AttributeProxy, DevState
+from tango import DeviceProxy, AttributeProxy, DevState, DevFailed
 
 import time
 import json, os
@@ -250,11 +250,11 @@ class Archiver():
             self.cm.AttributeStop(attribute_name)
             self.cm.AttributeRemove(attribute_name)
             logger.warning(f"Attribute {attribute_name} removed!")
-        except Exception as e:
-            if 'attribute not found' not in str(e).lower():
-                raise Exception from e
+        except DevFailed as e:
+            if e.args[0].reason == 'Attribute not found':
+                logger.warning(f"Attribute {attribute_name} not found!")
             else:
-                logger.warning(f"Attribute {attribute_name} not found in archiving list!")     
+                raise
     
     def remove_attributes_by_device(self,device_name:str,exclude:list=[]):
         """
@@ -297,11 +297,11 @@ class Archiver():
         attribute_name = attribute_name_from_url(attribute_name)
         try:
             self.cm.AttributeStart(attribute_name)
-        except Exception as e:
-            if 'attribute not found' not in str(e).lower():
-                raise Exception from e
-            else: 
+        except DevFailed as e:
+            if e.args[0].reason == "Attribute not found":
                 logger.warning(f"Attribute {attribute_name} not found!")
+            else:
+                raise
     
     def stop_archiving_attribute(self, attribute_name:str):
         """
@@ -311,11 +311,11 @@ class Archiver():
         attribute_name = attribute_name_from_url(attribute_name)
         try:
             self.cm.AttributeStop(attribute_name)
-        except Exception as e:
-            if 'attribute not found' not in str(e).lower():
-                raise Exception from e
-            else: 
+        except DevFailed as e:
+            if e.args[0].reason == "Attribute not found":
                 logger.warning(f"Attribute {attribute_name} not found!")
+            else:
+                raise
     
     def is_attribute_archived(self,attribute_name:str):
         """