get ability estimation from source

app/services/ability_estimation_service.py

@@ -1,9 +1,12 @@
-import logging
-
 from services.base import Base
+from models.ability_estimation import AbilityEstimation
 
 class AbilityEstimationService(Base):
   ACTION = 'abilityEstimation'
 
   def process(self):
-    logging.info('Ability Estimation Service to be implemented...')
+    attributes = self.service_attributes()
+    ability_estimation = AbilityEstimation.parse_obj(attributes)
+    results = ability_estimation.calculate()
+
+    return None

app/services/base.py

@@ -1,5 +1,25 @@
+import logging, json, re
+
+from helpers import aws_helper, tar_helper
+
 class Base:
 
     def __init__(self, source, ingest_type='message'):
         self.ingest_type = ingest_type
         self.source = source
+
+    def service_attributes(self):
+        logging.info('Retrieving attributes from message...')
+        # get s3 object
+        self.key = aws_helper.get_key_from_message(self.source)
+        s3_object = aws_helper.get_object(
+            self.key, aws_helper.get_bucket_from_message(self.source))
+
+        # convert to tar
+        self.tar = tar_helper.raw_to_tar(s3_object)
+
+        # get attributes file and convert to dict
+        action_snake = re.sub(r'(?<!^)(?=[A-Z])', '_', self.ACTION).lower()
+        attributes = json.loads(
+            tar_helper.extract_file_from_tar(
+                self.tar, f'{action_snake}_attributes.json').read())