community[patch]: Remove usage of deprecated StoredBlobHistory in CassandraChatMessageHistory (#20666)

libs/community/langchain_community/chat_message_histories/cassandra.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 
 import json
 import typing
+import uuid
 from typing import List
 
 if typing.TYPE_CHECKING:
@@ -41,7 +42,7 @@ class CassandraChatMessageHistory(BaseChatMessageHistory):
         ttl_seconds: typing.Optional[int] = DEFAULT_TTL_SECONDS,
     ) -> None:
         try:
-            from cassio.history import StoredBlobHistory
+            from cassio.table import ClusteredCassandraTable
         except (ImportError, ModuleNotFoundError):
             raise ImportError(
                 "Could not import cassio python package. "
@@ -49,24 +50,39 @@ class CassandraChatMessageHistory(BaseChatMessageHistory):
             )
         self.session_id = session_id
         self.ttl_seconds = ttl_seconds
-        self.blob_history = StoredBlobHistory(session, keyspace, table_name)
+        self.table = ClusteredCassandraTable(
+            session=session,
+            keyspace=keyspace,
+            table=table_name,
+            ttl_seconds=ttl_seconds,
+            primary_key_type=["TEXT", "TIMEUUID"],
+            ordering_in_partition="DESC",
+        )
 
     @property
     def messages(self) -> List[BaseMessage]:  # type: ignore
         """Retrieve all session messages from DB"""
-        message_blobs = self.blob_history.retrieve(
-            self.session_id,
-        )
+        # The latest are returned, in chronological order
+        message_blobs = [
+            row["body_blob"]
+            for row in self.table.get_partition(
+                partition_id=self.session_id,
+            )
+        ][::-1]
         items = [json.loads(message_blob) for message_blob in message_blobs]
         messages = messages_from_dict(items)
         return messages
 
     def add_message(self, message: BaseMessage) -> None:
         """Write a message to the table"""
-        self.blob_history.store(
-            self.session_id, json.dumps(message_to_dict(message)), self.ttl_seconds
+        this_row_id = uuid.uuid1()
+        self.table.put(
+            partition_id=self.session_id,
+            row_id=this_row_id,
+            body_blob=json.dumps(message_to_dict(message)),
+            ttl_seconds=self.ttl_seconds,
         )
 
     def clear(self) -> None:
         """Clear session memory from DB"""
-        self.blob_history.clear_session_id(self.session_id)
+        self.table.delete_partition(self.session_id)