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

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Christophe Bornet 2024-04-22 17:11:05 -04:00 committed by GitHub
parent eb18f4e155
commit 0ae5027d98
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1 changed files with 24 additions and 8 deletions
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32
libs/community/langchain_community/chat_message_histories/cassandra.py
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@ -3,6 +3,7 @@ from __future__ import annotations
import json import json
import typing import typing
import uuid
from typing import List from typing import List
if typing.TYPE_CHECKING: if typing.TYPE_CHECKING:
@ -41,7 +42,7 @@ class CassandraChatMessageHistory(BaseChatMessageHistory):
ttl_seconds: typing.Optional[int] = DEFAULT_TTL_SECONDS, ttl_seconds: typing.Optional[int] = DEFAULT_TTL_SECONDS,
) -> None: ) -> None:
try: try:
from cassio.history import StoredBlobHistory from cassio.table import ClusteredCassandraTable
except (ImportError, ModuleNotFoundError): except (ImportError, ModuleNotFoundError):
raise ImportError( raise ImportError(
"Could not import cassio python package. " "Could not import cassio python package. "
@ -49,24 +50,39 @@ class CassandraChatMessageHistory(BaseChatMessageHistory):
) )
self.session_id = session_id self.session_id = session_id
self.ttl_seconds = ttl_seconds 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 @property
def messages(self) -> List[BaseMessage]: # type: ignore def messages(self) -> List[BaseMessage]: # type: ignore
"""Retrieve all session messages from DB""" """Retrieve all session messages from DB"""
message_blobs = self.blob_history.retrieve( # The latest are returned, in chronological order
self.session_id, 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] items = [json.loads(message_blob) for message_blob in message_blobs]
messages = messages_from_dict(items) messages = messages_from_dict(items)
return messages return messages
def add_message(self, message: BaseMessage) -> None: def add_message(self, message: BaseMessage) -> None:
"""Write a message to the table""" """Write a message to the table"""
self.blob_history.store( this_row_id = uuid.uuid1()
self.session_id, json.dumps(message_to_dict(message)), self.ttl_seconds 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: def clear(self) -> None:
"""Clear session memory from DB""" """Clear session memory from DB"""
self.blob_history.clear_session_id(self.session_id) self.table.delete_partition(self.session_id)