Change: Message.time was float, becomes datetime

Change the type if BaseMessage.time to a datetime. This allows easier manipulation of the field, and parsing from strings as well as floats.

New APIs introduced in PyAleph 0.5.0 store the message time as timestampz and return it as ISO strings. This changes is compatible with both the old and new APIs.

aleph_message/models/__init__.py

@@ -1,3 +1,4 @@
+import datetime
 import json
 from copy import copy
 from enum import Enum
@@ -192,7 +193,7 @@ class BaseMessage(BaseModel):
     size: Optional[int] = Field(
         default=None, description="Size of the content"
     )  # Almost always present
-    time: float = Field(description="Unix timestamp when the message was published")
+    time: datetime.datetime = Field(description="Unix timestamp or datetime when the message was published")
     item_type: ItemType = Field(description="Storage method used for the content")
     item_content: Optional[str] = Field(
         default=None,

aleph_message/tests/test_models.py

@@ -213,9 +213,14 @@ def test_create_new_message():
         "signature": "0x123456789",  # Signature validation requires using aleph-client
     }
 
-    new_message_1 = create_new_message(message_dict, factory=PostMessage)
+    new_message_1: PostMessage = create_new_message(message_dict, factory=PostMessage)
     assert new_message_1
     assert new_message_1.type == MessageType.post
+    # Check that the time was converted to a datetime
+    assert new_message_1.time.isoformat() == '2021-07-07T10:04:47.017000+00:00'
+
+    # The time field can be either a float or a datetime as string
+    message_dict["time"] = '2021-07-07T10:04:47.017000+00:00'
     new_message_2 = create_message_from_json(
         json.dumps(message_dict), factory=PostMessage
     )