Fixes formating and check size of all fields

gcn_email/core.py

@@ -9,6 +9,7 @@
 import logging
 import os
 import json
+import sys
 
 import boto3
 from boto3.dynamodb.conditions import Key
@@ -82,10 +83,12 @@ def kafka_message_to_email(message):
             message.value(), filename='notice.xml',
             maintype='application', subtype='xml')
     elif topic.startswith('gcn.notices.'):
-        value = json.loads(message.value().decode())
-        if 'healpix_file' in value:
-            value['healpix_file'] = 'This content is too large for email. To receive it, see https://gcn.nasa.gov/quickstart'
-        email_message.set_content(json.dumps(value, indent=4))
+        valueJson = json.loads(message.value().decode())
+        for key in valueJson:
+            if sys.getsizeof(valueJson[key]) > 512:
+                valueJson[key] = 'This content is too large for email. '\
+                'To receive it, see https://gcn.nasa.gov/quickstart'
+        email_message.set_content(json.dumps(valueJson, indent=4))
     else:
         email_message.add_attachment(
             message.value(), filename='notice.bin',