better abstraction and error handling/logging

app/services/ability_estimation_service.py

@@ -11,12 +11,21 @@ class AbilityEstimationService(Base):
   def process(self):
     attributes = self.service_attributes()
     ability_estimation = AbilityEstimation.parse_obj(attributes)
-    # we need to convert the results from numpy array to a list to dump to json
-    json_data = json.dumps(ability_estimation.calculate().tolist())
+    result = ability_estimation.calculate()
 
-    # temp file name
-    self.file_name = f'{ability_estimation.exam_id}_ability_estimation_result.json'
+    if result is not None:
+      response = json.dumps({
+        'status': 'success',
+        'result': result
+      })
+
+      self.file_name = f'{ability_estimation.exam_id}_ability_estimation_result.json'
+    else:
+      response = json.dumps({
+        'status': 'error',
+        'result': None
+      })
 
     return aws_helper.file_stream_upload(
-            io.BytesIO(bytes(json_data.encode('UTF-8'))), self.file_name,
+            io.BytesIO(bytes(response.encode('UTF-8'))), self.file_name,
             ApplicationConfigs.s3_processed_bucket, self.ACTION)