Add EmailObjectBuilder impl and fix some bugs

test/test_object.py

@@ -1,5 +1,6 @@
 import sys
 import os
+import logging
 
 dir_path = os.path.dirname(os.path.realpath(__file__))
 print(dir_path)
@@ -7,9 +8,16 @@ print(dir_path)
 sys.path.append("{}/../src/".format(dir_path))
 print(sys.path)
 
-from knowledge import ObjectID, HashValue
+root = logging.getLogger()
+root.setLevel(logging.DEBUG)
+handler = logging.StreamHandler(sys.stdout)
+handler.setLevel(logging.DEBUG)
+formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+handler.setFormatter(formatter)
+root.addHandler(handler)
 
 
+from knowledge import ObjectID, HashValue, EmailObjectBuilder
 import asyncio
 import unittest
 
@@ -26,6 +34,8 @@ class TestVectorSTorage(unittest.TestCase):
         data2 = HashValue.from_base36(data.to_base36())
         self.assertEqual(data.to_base58(), data2.to_base58())
 
-
+        email_folder = "F:\\system\\Downloads\\8081ffdb80925f5bff9c6ab9c4756c7d"
+        email_object = EmailObjectBuilder({}, email_folder).build()
+        
 if __name__ == "__main__":
     unittest.main()