add download sample

enrollments-events/app/events/issue_cert.py

@@ -21,7 +21,8 @@ from config import (
 )
 
 logger = Logger(__name__)
-dyn = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
+enrollment_layer = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
+course_layer = DynamoDBPersistenceLayer(COURSE_TABLE, dynamodb_client)
 
 
 @event_source(data_class=EventBridgeEvent)
@@ -31,11 +32,10 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
     now_ = now()
     enrollment_id = new_image['id']
     course_id = new_image['course']['id']
-    cert = dyn.collection.get_item(
+    cert = course_layer.collection.get_item(
         KeyPair(
             pk=course_id,
             sk=SortKey('0', path_spec='cert', rename_key='cert'),
-            table_name=COURSE_TABLE,
         ),
         raise_on_error=False,
         default=False,
@@ -101,7 +101,7 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
         logger.exception(exc)
         raise
 
-    return dyn.update_item(
+    return enrollment_layer.update_item(
         key=KeyPair(
             pk=enrollment_id,
             sk='0',