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